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linux/drivers/net/ethernet/ibm/ibmvnic.c
Rick Lindsley 1b18f09d31 ibmvnic: Properly dispose of all skbs during a failover. 
During a reset, there may have been transmits in flight that are no
longer valid and cannot be fulfilled.  Resetting and clearing the
queues is insufficient; each skb also needs to be explicitly freed
so that upper levels are not left waiting for confirmation of a
transmit that will never happen.  If this happens frequently enough,
the apparent backlog will cause TCP to begin "congestion control"
unnecessarily, culminating in permanently decreased throughput.

Fixes: d7c0ef36bd ("ibmvnic: Free and re-allocate scrqs when tx/rx scrqs change")
Tested-by: Nick Child <nnac123@linux.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Rick Lindsley <ricklind@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-07-04 11:09:57 +01:00

6352 lines
173 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/**************************************************************************/
/* */
/* IBM System i and System p Virtual NIC Device Driver */
/* Copyright (C) 2014 IBM Corp. */
/* Santiago Leon (santi_leon@yahoo.com) */
/* Thomas Falcon (tlfalcon@linux.vnet.ibm.com) */
/* John Allen (jallen@linux.vnet.ibm.com) */
/* */
/* */
/* This module contains the implementation of a virtual ethernet device */
/* for use with IBM i/p Series LPAR Linux. It utilizes the logical LAN */
/* option of the RS/6000 Platform Architecture to interface with virtual */
/* ethernet NICs that are presented to the partition by the hypervisor. */
/* */
/* Messages are passed between the VNIC driver and the VNIC server using */
/* Command/Response Queues (CRQs) and sub CRQs (sCRQs). CRQs are used to */
/* issue and receive commands that initiate communication with the server */
/* on driver initialization. Sub CRQs (sCRQs) are similar to CRQs, but */
/* are used by the driver to notify the server that a packet is */
/* ready for transmission or that a buffer has been added to receive a */
/* packet. Subsequently, sCRQs are used by the server to notify the */
/* driver that a packet transmission has been completed or that a packet */
/* has been received and placed in a waiting buffer. */
/* */
/* In lieu of a more conventional "on-the-fly" DMA mapping strategy in */
/* which skbs are DMA mapped and immediately unmapped when the transmit */
/* or receive has been completed, the VNIC driver is required to use */
/* "long term mapping". This entails that large, continuous DMA mapped */
/* buffers are allocated on driver initialization and these buffers are */
/* then continuously reused to pass skbs to and from the VNIC server. */
/* */
/**************************************************************************/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/completion.h>
#include <linux/ioport.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/ethtool.h>
#include <linux/proc_fs.h>
#include <linux/if_arp.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kthread.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <net/net_namespace.h>
#include <asm/hvcall.h>
#include <linux/atomic.h>
#include <asm/vio.h>
#include <asm/xive.h>
#include <asm/iommu.h>
#include <linux/uaccess.h>
#include <asm/firmware.h>
#include <linux/workqueue.h>
#include <linux/if_vlan.h>
#include <linux/utsname.h>
#include "ibmvnic.h"
static const char ibmvnic_driver_name[] = "ibmvnic";
static const char ibmvnic_driver_string[] = "IBM System i/p Virtual NIC Driver";
MODULE_AUTHOR("Santiago Leon");
MODULE_DESCRIPTION("IBM System i/p Virtual NIC Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(IBMVNIC_DRIVER_VERSION);
static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
static void release_sub_crqs(struct ibmvnic_adapter *, bool);
static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *);
static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64);
static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance);
static int enable_scrq_irq(struct ibmvnic_adapter *,
struct ibmvnic_sub_crq_queue *);
static int disable_scrq_irq(struct ibmvnic_adapter *,
struct ibmvnic_sub_crq_queue *);
static int pending_scrq(struct ibmvnic_adapter *,
struct ibmvnic_sub_crq_queue *);
static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *,
struct ibmvnic_sub_crq_queue *);
static int ibmvnic_poll(struct napi_struct *napi, int data);
static void send_query_map(struct ibmvnic_adapter *adapter);
static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, u32, u8);
static int send_request_unmap(struct ibmvnic_adapter *, u8);
static int send_login(struct ibmvnic_adapter *adapter);
static void send_query_cap(struct ibmvnic_adapter *adapter);
static int init_sub_crqs(struct ibmvnic_adapter *);
static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
static int ibmvnic_reset_init(struct ibmvnic_adapter *, bool reset);
static void release_crq_queue(struct ibmvnic_adapter *);
static int __ibmvnic_set_mac(struct net_device *, u8 *);
static int init_crq_queue(struct ibmvnic_adapter *adapter);
static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *tx_scrq);
static void free_long_term_buff(struct ibmvnic_adapter *adapter,
struct ibmvnic_long_term_buff *ltb);
static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter);
struct ibmvnic_stat {
char name[ETH_GSTRING_LEN];
int offset;
};
#define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \
offsetof(struct ibmvnic_statistics, stat))
#define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + (off))))
static const struct ibmvnic_stat ibmvnic_stats[] = {
{"rx_packets", IBMVNIC_STAT_OFF(rx_packets)},
{"rx_bytes", IBMVNIC_STAT_OFF(rx_bytes)},
{"tx_packets", IBMVNIC_STAT_OFF(tx_packets)},
{"tx_bytes", IBMVNIC_STAT_OFF(tx_bytes)},
{"ucast_tx_packets", IBMVNIC_STAT_OFF(ucast_tx_packets)},
{"ucast_rx_packets", IBMVNIC_STAT_OFF(ucast_rx_packets)},
{"mcast_tx_packets", IBMVNIC_STAT_OFF(mcast_tx_packets)},
{"mcast_rx_packets", IBMVNIC_STAT_OFF(mcast_rx_packets)},
{"bcast_tx_packets", IBMVNIC_STAT_OFF(bcast_tx_packets)},
{"bcast_rx_packets", IBMVNIC_STAT_OFF(bcast_rx_packets)},
{"align_errors", IBMVNIC_STAT_OFF(align_errors)},
{"fcs_errors", IBMVNIC_STAT_OFF(fcs_errors)},
{"single_collision_frames", IBMVNIC_STAT_OFF(single_collision_frames)},
{"multi_collision_frames", IBMVNIC_STAT_OFF(multi_collision_frames)},
{"sqe_test_errors", IBMVNIC_STAT_OFF(sqe_test_errors)},
{"deferred_tx", IBMVNIC_STAT_OFF(deferred_tx)},
{"late_collisions", IBMVNIC_STAT_OFF(late_collisions)},
{"excess_collisions", IBMVNIC_STAT_OFF(excess_collisions)},
{"internal_mac_tx_errors", IBMVNIC_STAT_OFF(internal_mac_tx_errors)},
{"carrier_sense", IBMVNIC_STAT_OFF(carrier_sense)},
{"too_long_frames", IBMVNIC_STAT_OFF(too_long_frames)},
{"internal_mac_rx_errors", IBMVNIC_STAT_OFF(internal_mac_rx_errors)},
};
static int send_crq_init_complete(struct ibmvnic_adapter *adapter)
{
union ibmvnic_crq crq;
memset(&crq, 0, sizeof(crq));
crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
crq.generic.cmd = IBMVNIC_CRQ_INIT_COMPLETE;
return ibmvnic_send_crq(adapter, &crq);
}
static int send_version_xchg(struct ibmvnic_adapter *adapter)
{
union ibmvnic_crq crq;
memset(&crq, 0, sizeof(crq));
crq.version_exchange.first = IBMVNIC_CRQ_CMD;
crq.version_exchange.cmd = VERSION_EXCHANGE;
crq.version_exchange.version = cpu_to_be16(ibmvnic_version);
return ibmvnic_send_crq(adapter, &crq);
}
static long h_reg_sub_crq(unsigned long unit_address, unsigned long token,
unsigned long length, unsigned long *number,
unsigned long *irq)
{
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
long rc;
rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, token, length);
*number = retbuf[0];
*irq = retbuf[1];
return rc;
}
/**
* ibmvnic_wait_for_completion - Check device state and wait for completion
* @adapter: private device data
* @comp_done: completion structure to wait for
* @timeout: time to wait in milliseconds
*
* Wait for a completion signal or until the timeout limit is reached
* while checking that the device is still active.
*/
static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter,
struct completion *comp_done,
unsigned long timeout)
{
struct net_device *netdev;
unsigned long div_timeout;
u8 retry;
netdev = adapter->netdev;
retry = 5;
div_timeout = msecs_to_jiffies(timeout / retry);
while (true) {
if (!adapter->crq.active) {
netdev_err(netdev, "Device down!\n");
return -ENODEV;
}
if (!retry--)
break;
if (wait_for_completion_timeout(comp_done, div_timeout))
return 0;
}
netdev_err(netdev, "Operation timed out.\n");
return -ETIMEDOUT;
}
/**
* reuse_ltb() - Check if a long term buffer can be reused
* @ltb: The long term buffer to be checked
* @size: The size of the long term buffer.
*
* An LTB can be reused unless its size has changed.
*
* Return: Return true if the LTB can be reused, false otherwise.
*/
static bool reuse_ltb(struct ibmvnic_long_term_buff *ltb, int size)
{
return (ltb->buff && ltb->size == size);
}
/**
* alloc_long_term_buff() - Allocate a long term buffer (LTB)
*
* @adapter: ibmvnic adapter associated to the LTB
* @ltb: container object for the LTB
* @size: size of the LTB
*
* Allocate an LTB of the specified size and notify VIOS.
*
* If the given @ltb already has the correct size, reuse it. Otherwise if
* its non-NULL, free it. Then allocate a new one of the correct size.
* Notify the VIOS either way since we may now be working with a new VIOS.
*
* Allocating larger chunks of memory during resets, specially LPM or under
* low memory situations can cause resets to fail/timeout and for LPAR to
* lose connectivity. So hold onto the LTB even if we fail to communicate
* with the VIOS and reuse it on next open. Free LTB when adapter is closed.
*
* Return: 0 if we were able to allocate the LTB and notify the VIOS and
* a negative value otherwise.
*/
static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
struct ibmvnic_long_term_buff *ltb, int size)
{
struct device *dev = &adapter->vdev->dev;
u64 prev = 0;
int rc;
if (!reuse_ltb(ltb, size)) {
dev_dbg(dev,
"LTB size changed from 0x%llx to 0x%x, reallocating\n",
ltb->size, size);
prev = ltb->size;
free_long_term_buff(adapter, ltb);
}
if (ltb->buff) {
dev_dbg(dev, "Reusing LTB [map %d, size 0x%llx]\n",
ltb->map_id, ltb->size);
} else {
ltb->buff = dma_alloc_coherent(dev, size, &ltb->addr,
GFP_KERNEL);
if (!ltb->buff) {
dev_err(dev, "Couldn't alloc long term buffer\n");
return -ENOMEM;
}
ltb->size = size;
ltb->map_id = find_first_zero_bit(adapter->map_ids,
MAX_MAP_ID);
bitmap_set(adapter->map_ids, ltb->map_id, 1);
dev_dbg(dev,
"Allocated new LTB [map %d, size 0x%llx was 0x%llx]\n",
ltb->map_id, ltb->size, prev);
}
/* Ensure ltb is zeroed - specially when reusing it. */
memset(ltb->buff, 0, ltb->size);
mutex_lock(&adapter->fw_lock);
adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
if (rc) {
dev_err(dev, "send_request_map failed, rc = %d\n", rc);
goto out;
}
rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
if (rc) {
dev_err(dev, "LTB map request aborted or timed out, rc = %d\n",
rc);
goto out;
}
if (adapter->fw_done_rc) {
dev_err(dev, "Couldn't map LTB, rc = %d\n",
adapter->fw_done_rc);
rc = -EIO;
goto out;
}
rc = 0;
out:
/* don't free LTB on communication error - see function header */
mutex_unlock(&adapter->fw_lock);
return rc;
}
static void free_long_term_buff(struct ibmvnic_adapter *adapter,
struct ibmvnic_long_term_buff *ltb)
{
struct device *dev = &adapter->vdev->dev;
if (!ltb->buff)
return;
/* VIOS automatically unmaps the long term buffer at remote
* end for the following resets:
* FAILOVER, MOBILITY, TIMEOUT.
*/
if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
adapter->reset_reason != VNIC_RESET_MOBILITY &&
adapter->reset_reason != VNIC_RESET_TIMEOUT)
send_request_unmap(adapter, ltb->map_id);
dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
ltb->buff = NULL;
/* mark this map_id free */
bitmap_clear(adapter->map_ids, ltb->map_id, 1);
ltb->map_id = 0;
}
/**
* free_ltb_set - free the given set of long term buffers (LTBS)
* @adapter: The ibmvnic adapter containing this ltb set
* @ltb_set: The ltb_set to be freed
*
* Free the set of LTBs in the given set.
*/
static void free_ltb_set(struct ibmvnic_adapter *adapter,
struct ibmvnic_ltb_set *ltb_set)
{
int i;
for (i = 0; i < ltb_set->num_ltbs; i++)
free_long_term_buff(adapter, &ltb_set->ltbs[i]);
kfree(ltb_set->ltbs);
ltb_set->ltbs = NULL;
ltb_set->num_ltbs = 0;
}
/**
* alloc_ltb_set() - Allocate a set of long term buffers (LTBs)
*
* @adapter: ibmvnic adapter associated to the LTB
* @ltb_set: container object for the set of LTBs
* @num_buffs: Number of buffers in the LTB
* @buff_size: Size of each buffer in the LTB
*
* Allocate a set of LTBs to accommodate @num_buffs buffers of @buff_size
* each. We currently cap size each LTB to IBMVNIC_ONE_LTB_SIZE. If the
* new set of LTBs have fewer LTBs than the old set, free the excess LTBs.
* If new set needs more than in old set, allocate the remaining ones.
* Try and reuse as many LTBs as possible and avoid reallocation.
*
* Any changes to this allocation strategy must be reflected in
* map_rxpool_buff_to_ltb() and map_txpool_buff_to_ltb().
*/
static int alloc_ltb_set(struct ibmvnic_adapter *adapter,
struct ibmvnic_ltb_set *ltb_set, int num_buffs,
int buff_size)
{
struct device *dev = &adapter->vdev->dev;
struct ibmvnic_ltb_set old_set;
struct ibmvnic_ltb_set new_set;
int rem_size;
int tot_size; /* size of all ltbs */
int ltb_size; /* size of one ltb */
int nltbs;
int rc;
int n;
int i;
dev_dbg(dev, "%s() num_buffs %d, buff_size %d\n", __func__, num_buffs,
buff_size);
ltb_size = rounddown(IBMVNIC_ONE_LTB_SIZE, buff_size);
tot_size = num_buffs * buff_size;
if (ltb_size > tot_size)
ltb_size = tot_size;
nltbs = tot_size / ltb_size;
if (tot_size % ltb_size)
nltbs++;
old_set = *ltb_set;
if (old_set.num_ltbs == nltbs) {
new_set = old_set;
} else {
int tmp = nltbs * sizeof(struct ibmvnic_long_term_buff);
new_set.ltbs = kzalloc(tmp, GFP_KERNEL);
if (!new_set.ltbs)
return -ENOMEM;
new_set.num_ltbs = nltbs;
/* Free any excess ltbs in old set */
for (i = new_set.num_ltbs; i < old_set.num_ltbs; i++)
free_long_term_buff(adapter, &old_set.ltbs[i]);
/* Copy remaining ltbs to new set. All LTBs except the
* last one are of the same size. alloc_long_term_buff()
* will realloc if the size changes.
*/
n = min(old_set.num_ltbs, new_set.num_ltbs);
for (i = 0; i < n; i++)
new_set.ltbs[i] = old_set.ltbs[i];
/* Any additional ltbs in new set will have NULL ltbs for
* now and will be allocated in alloc_long_term_buff().
*/
/* We no longer need the old_set so free it. Note that we
* may have reused some ltbs from old set and freed excess
* ltbs above. So we only need to free the container now
* not the LTBs themselves. (i.e. dont free_ltb_set()!)
*/
kfree(old_set.ltbs);
old_set.ltbs = NULL;
old_set.num_ltbs = 0;
/* Install the new set. If allocations fail below, we will
* retry later and know what size LTBs we need.
*/
*ltb_set = new_set;
}
i = 0;
rem_size = tot_size;
while (rem_size) {
if (ltb_size > rem_size)
ltb_size = rem_size;
rem_size -= ltb_size;
rc = alloc_long_term_buff(adapter, &new_set.ltbs[i], ltb_size);
if (rc)
goto out;
i++;
}
WARN_ON(i != new_set.num_ltbs);
return 0;
out:
/* We may have allocated one/more LTBs before failing and we
* want to try and reuse on next reset. So don't free ltb set.
*/
return rc;
}
/**
* map_rxpool_buf_to_ltb - Map given rxpool buffer to offset in an LTB.
* @rxpool: The receive buffer pool containing buffer
* @bufidx: Index of buffer in rxpool
* @ltbp: (Output) pointer to the long term buffer containing the buffer
* @offset: (Output) offset of buffer in the LTB from @ltbp
*
* Map the given buffer identified by [rxpool, bufidx] to an LTB in the
* pool and its corresponding offset. Assume for now that each LTB is of
* different size but could possibly be optimized based on the allocation
* strategy in alloc_ltb_set().
*/
static void map_rxpool_buf_to_ltb(struct ibmvnic_rx_pool *rxpool,
unsigned int bufidx,
struct ibmvnic_long_term_buff **ltbp,
unsigned int *offset)
{
struct ibmvnic_long_term_buff *ltb;
int nbufs; /* # of buffers in one ltb */
int i;
WARN_ON(bufidx >= rxpool->size);
for (i = 0; i < rxpool->ltb_set.num_ltbs; i++) {
ltb = &rxpool->ltb_set.ltbs[i];
nbufs = ltb->size / rxpool->buff_size;
if (bufidx < nbufs)
break;
bufidx -= nbufs;
}
*ltbp = ltb;
*offset = bufidx * rxpool->buff_size;
}
/**
* map_txpool_buf_to_ltb - Map given txpool buffer to offset in an LTB.
* @txpool: The transmit buffer pool containing buffer
* @bufidx: Index of buffer in txpool
* @ltbp: (Output) pointer to the long term buffer (LTB) containing the buffer
* @offset: (Output) offset of buffer in the LTB from @ltbp
*
* Map the given buffer identified by [txpool, bufidx] to an LTB in the
* pool and its corresponding offset.
*/
static void map_txpool_buf_to_ltb(struct ibmvnic_tx_pool *txpool,
unsigned int bufidx,
struct ibmvnic_long_term_buff **ltbp,
unsigned int *offset)
{
struct ibmvnic_long_term_buff *ltb;
int nbufs; /* # of buffers in one ltb */
int i;
WARN_ON_ONCE(bufidx >= txpool->num_buffers);
for (i = 0; i < txpool->ltb_set.num_ltbs; i++) {
ltb = &txpool->ltb_set.ltbs[i];
nbufs = ltb->size / txpool->buf_size;
if (bufidx < nbufs)
break;
bufidx -= nbufs;
}
*ltbp = ltb;
*offset = bufidx * txpool->buf_size;
}
static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
{
int i;
for (i = 0; i < adapter->num_active_rx_pools; i++)
adapter->rx_pool[i].active = 0;
}
static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
struct ibmvnic_rx_pool *pool)
{
int count = pool->size - atomic_read(&pool->available);
u64 handle = adapter->rx_scrq[pool->index]->handle;
struct device *dev = &adapter->vdev->dev;
struct ibmvnic_ind_xmit_queue *ind_bufp;
struct ibmvnic_sub_crq_queue *rx_scrq;
struct ibmvnic_long_term_buff *ltb;
union sub_crq *sub_crq;
int buffers_added = 0;
unsigned long lpar_rc;
struct sk_buff *skb;
unsigned int offset;
dma_addr_t dma_addr;
unsigned char *dst;
int shift = 0;
int bufidx;
int i;
if (!pool->active)
return;
rx_scrq = adapter->rx_scrq[pool->index];
ind_bufp = &rx_scrq->ind_buf;
/* netdev_skb_alloc() could have failed after we saved a few skbs
* in the indir_buf and we would not have sent them to VIOS yet.
* To account for them, start the loop at ind_bufp->index rather
* than 0. If we pushed all the skbs to VIOS, ind_bufp->index will
* be 0.
*/
for (i = ind_bufp->index; i < count; ++i) {
bufidx = pool->free_map[pool->next_free];
/* We maybe reusing the skb from earlier resets. Allocate
* only if necessary. But since the LTB may have changed
* during reset (see init_rx_pools()), update LTB below
* even if reusing skb.
*/
skb = pool->rx_buff[bufidx].skb;
if (!skb) {
skb = netdev_alloc_skb(adapter->netdev,
pool->buff_size);
if (!skb) {
dev_err(dev, "Couldn't replenish rx buff\n");
adapter->replenish_no_mem++;
break;
}
}
pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
pool->next_free = (pool->next_free + 1) % pool->size;
/* Copy the skb to the long term mapped DMA buffer */
map_rxpool_buf_to_ltb(pool, bufidx, &ltb, &offset);
dst = ltb->buff + offset;
memset(dst, 0, pool->buff_size);
dma_addr = ltb->addr + offset;
/* add the skb to an rx_buff in the pool */
pool->rx_buff[bufidx].data = dst;
pool->rx_buff[bufidx].dma = dma_addr;
pool->rx_buff[bufidx].skb = skb;
pool->rx_buff[bufidx].pool_index = pool->index;
pool->rx_buff[bufidx].size = pool->buff_size;
/* queue the rx_buff for the next send_subcrq_indirect */
sub_crq = &ind_bufp->indir_arr[ind_bufp->index++];
memset(sub_crq, 0, sizeof(*sub_crq));
sub_crq->rx_add.first = IBMVNIC_CRQ_CMD;
sub_crq->rx_add.correlator =
cpu_to_be64((u64)&pool->rx_buff[bufidx]);
sub_crq->rx_add.ioba = cpu_to_be32(dma_addr);
sub_crq->rx_add.map_id = ltb->map_id;
/* The length field of the sCRQ is defined to be 24 bits so the
* buffer size needs to be left shifted by a byte before it is
* converted to big endian to prevent the last byte from being
* truncated.
*/
#ifdef __LITTLE_ENDIAN__
shift = 8;
#endif
sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift);
/* if send_subcrq_indirect queue is full, flush to VIOS */
if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS ||
i == count - 1) {
lpar_rc =
send_subcrq_indirect(adapter, handle,
(u64)ind_bufp->indir_dma,
(u64)ind_bufp->index);
if (lpar_rc != H_SUCCESS)
goto failure;
buffers_added += ind_bufp->index;
adapter->replenish_add_buff_success += ind_bufp->index;
ind_bufp->index = 0;
}
}
atomic_add(buffers_added, &pool->available);
return;
failure:
if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED)
dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n");
for (i = ind_bufp->index - 1; i >= 0; --i) {
struct ibmvnic_rx_buff *rx_buff;
pool->next_free = pool->next_free == 0 ?
pool->size - 1 : pool->next_free - 1;
sub_crq = &ind_bufp->indir_arr[i];
rx_buff = (struct ibmvnic_rx_buff *)
be64_to_cpu(sub_crq->rx_add.correlator);
bufidx = (int)(rx_buff - pool->rx_buff);
pool->free_map[pool->next_free] = bufidx;
dev_kfree_skb_any(pool->rx_buff[bufidx].skb);
pool->rx_buff[bufidx].skb = NULL;
}
adapter->replenish_add_buff_failure += ind_bufp->index;
atomic_add(buffers_added, &pool->available);
ind_bufp->index = 0;
if (lpar_rc == H_CLOSED || adapter->failover_pending) {
/* Disable buffer pool replenishment and report carrier off if
* queue is closed or pending failover.
* Firmware guarantees that a signal will be sent to the
* driver, triggering a reset.
*/
deactivate_rx_pools(adapter);
netif_carrier_off(adapter->netdev);
}
}
static void replenish_pools(struct ibmvnic_adapter *adapter)
{
int i;
adapter->replenish_task_cycles++;
for (i = 0; i < adapter->num_active_rx_pools; i++) {
if (adapter->rx_pool[i].active)
replenish_rx_pool(adapter, &adapter->rx_pool[i]);
}
netdev_dbg(adapter->netdev, "Replenished %d pools\n", i);
}
static void release_stats_buffers(struct ibmvnic_adapter *adapter)
{
kfree(adapter->tx_stats_buffers);
kfree(adapter->rx_stats_buffers);
adapter->tx_stats_buffers = NULL;
adapter->rx_stats_buffers = NULL;
}
static int init_stats_buffers(struct ibmvnic_adapter *adapter)
{
adapter->tx_stats_buffers =
kcalloc(IBMVNIC_MAX_QUEUES,
sizeof(struct ibmvnic_tx_queue_stats),
GFP_KERNEL);
if (!adapter->tx_stats_buffers)
return -ENOMEM;
adapter->rx_stats_buffers =
kcalloc(IBMVNIC_MAX_QUEUES,
sizeof(struct ibmvnic_rx_queue_stats),
GFP_KERNEL);
if (!adapter->rx_stats_buffers)
return -ENOMEM;
return 0;
}
static void release_stats_token(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
if (!adapter->stats_token)
return;
dma_unmap_single(dev, adapter->stats_token,
sizeof(struct ibmvnic_statistics),
DMA_FROM_DEVICE);
adapter->stats_token = 0;
}
static int init_stats_token(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
dma_addr_t stok;
int rc;
stok = dma_map_single(dev, &adapter->stats,
sizeof(struct ibmvnic_statistics),
DMA_FROM_DEVICE);
rc = dma_mapping_error(dev, stok);
if (rc) {
dev_err(dev, "Couldn't map stats buffer, rc = %d\n", rc);
return rc;
}
adapter->stats_token = stok;
netdev_dbg(adapter->netdev, "Stats token initialized (%llx)\n", stok);
return 0;
}
/**
* release_rx_pools() - Release any rx pools attached to @adapter.
* @adapter: ibmvnic adapter
*
* Safe to call this multiple times - even if no pools are attached.
*/
static void release_rx_pools(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_rx_pool *rx_pool;
int i, j;
if (!adapter->rx_pool)
return;
for (i = 0; i < adapter->num_active_rx_pools; i++) {
rx_pool = &adapter->rx_pool[i];
netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i);
kfree(rx_pool->free_map);
free_ltb_set(adapter, &rx_pool->ltb_set);
if (!rx_pool->rx_buff)
continue;
for (j = 0; j < rx_pool->size; j++) {
if (rx_pool->rx_buff[j].skb) {
dev_kfree_skb_any(rx_pool->rx_buff[j].skb);
rx_pool->rx_buff[j].skb = NULL;
}
}
kfree(rx_pool->rx_buff);
}
kfree(adapter->rx_pool);
adapter->rx_pool = NULL;
adapter->num_active_rx_pools = 0;
adapter->prev_rx_pool_size = 0;
}
/**
* reuse_rx_pools() - Check if the existing rx pools can be reused.
* @adapter: ibmvnic adapter
*
* Check if the existing rx pools in the adapter can be reused. The
* pools can be reused if the pool parameters (number of pools,
* number of buffers in the pool and size of each buffer) have not
* changed.
*
* NOTE: This assumes that all pools have the same number of buffers
* which is the case currently. If that changes, we must fix this.
*
* Return: true if the rx pools can be reused, false otherwise.
*/
static bool reuse_rx_pools(struct ibmvnic_adapter *adapter)
{
u64 old_num_pools, new_num_pools;
u64 old_pool_size, new_pool_size;
u64 old_buff_size, new_buff_size;
if (!adapter->rx_pool)
return false;
old_num_pools = adapter->num_active_rx_pools;
new_num_pools = adapter->req_rx_queues;
old_pool_size = adapter->prev_rx_pool_size;
new_pool_size = adapter->req_rx_add_entries_per_subcrq;
old_buff_size = adapter->prev_rx_buf_sz;
new_buff_size = adapter->cur_rx_buf_sz;
if (old_buff_size != new_buff_size ||
old_num_pools != new_num_pools ||
old_pool_size != new_pool_size)
return false;
return true;
}
/**
* init_rx_pools(): Initialize the set of receiver pools in the adapter.
* @netdev: net device associated with the vnic interface
*
* Initialize the set of receiver pools in the ibmvnic adapter associated
* with the net_device @netdev. If possible, reuse the existing rx pools.
* Otherwise free any existing pools and allocate a new set of pools
* before initializing them.
*
* Return: 0 on success and negative value on error.
*/
static int init_rx_pools(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
struct device *dev = &adapter->vdev->dev;
struct ibmvnic_rx_pool *rx_pool;
u64 num_pools;
u64 pool_size; /* # of buffers in one pool */
u64 buff_size;
int i, j, rc;
pool_size = adapter->req_rx_add_entries_per_subcrq;
num_pools = adapter->req_rx_queues;
buff_size = adapter->cur_rx_buf_sz;
if (reuse_rx_pools(adapter)) {
dev_dbg(dev, "Reusing rx pools\n");
goto update_ltb;
}
/* Allocate/populate the pools. */
release_rx_pools(adapter);
adapter->rx_pool = kcalloc(num_pools,
sizeof(struct ibmvnic_rx_pool),
GFP_KERNEL);
if (!adapter->rx_pool) {
dev_err(dev, "Failed to allocate rx pools\n");
return -ENOMEM;
}
/* Set num_active_rx_pools early. If we fail below after partial
* allocation, release_rx_pools() will know how many to look for.
*/
adapter->num_active_rx_pools = num_pools;
for (i = 0; i < num_pools; i++) {
rx_pool = &adapter->rx_pool[i];
netdev_dbg(adapter->netdev,
"Initializing rx_pool[%d], %lld buffs, %lld bytes each\n",
i, pool_size, buff_size);
rx_pool->size = pool_size;
rx_pool->index = i;
rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
GFP_KERNEL);
if (!rx_pool->free_map) {
dev_err(dev, "Couldn't alloc free_map %d\n", i);
rc = -ENOMEM;
goto out_release;
}
rx_pool->rx_buff = kcalloc(rx_pool->size,
sizeof(struct ibmvnic_rx_buff),
GFP_KERNEL);
if (!rx_pool->rx_buff) {
dev_err(dev, "Couldn't alloc rx buffers\n");
rc = -ENOMEM;
goto out_release;
}
}
adapter->prev_rx_pool_size = pool_size;
adapter->prev_rx_buf_sz = adapter->cur_rx_buf_sz;
update_ltb:
for (i = 0; i < num_pools; i++) {
rx_pool = &adapter->rx_pool[i];
dev_dbg(dev, "Updating LTB for rx pool %d [%d, %d]\n",
i, rx_pool->size, rx_pool->buff_size);
rc = alloc_ltb_set(adapter, &rx_pool->ltb_set,
rx_pool->size, rx_pool->buff_size);
if (rc)
goto out;
for (j = 0; j < rx_pool->size; ++j) {
struct ibmvnic_rx_buff *rx_buff;
rx_pool->free_map[j] = j;
/* NOTE: Don't clear rx_buff->skb here - will leak
* memory! replenish_rx_pool() will reuse skbs or
* allocate as necessary.
*/
rx_buff = &rx_pool->rx_buff[j];
rx_buff->dma = 0;
rx_buff->data = 0;
rx_buff->size = 0;
rx_buff->pool_index = 0;
}
/* Mark pool "empty" so replenish_rx_pools() will
* update the LTB info for each buffer
*/
atomic_set(&rx_pool->available, 0);
rx_pool->next_alloc = 0;
rx_pool->next_free = 0;
/* replenish_rx_pool() may have called deactivate_rx_pools()
* on failover. Ensure pool is active now.
*/
rx_pool->active = 1;
}
return 0;
out_release:
release_rx_pools(adapter);
out:
/* We failed to allocate one or more LTBs or map them on the VIOS.
* Hold onto the pools and any LTBs that we did allocate/map.
*/
return rc;
}
static void release_vpd_data(struct ibmvnic_adapter *adapter)
{
if (!adapter->vpd)
return;
kfree(adapter->vpd->buff);
kfree(adapter->vpd);
adapter->vpd = NULL;
}
static void release_one_tx_pool(struct ibmvnic_adapter *adapter,
struct ibmvnic_tx_pool *tx_pool)
{
kfree(tx_pool->tx_buff);
kfree(tx_pool->free_map);
free_ltb_set(adapter, &tx_pool->ltb_set);
}
/**
* release_tx_pools() - Release any tx pools attached to @adapter.
* @adapter: ibmvnic adapter
*
* Safe to call this multiple times - even if no pools are attached.
*/
static void release_tx_pools(struct ibmvnic_adapter *adapter)
{
int i;
/* init_tx_pools() ensures that ->tx_pool and ->tso_pool are
* both NULL or both non-NULL. So we only need to check one.
*/
if (!adapter->tx_pool)
return;
for (i = 0; i < adapter->num_active_tx_pools; i++) {
release_one_tx_pool(adapter, &adapter->tx_pool[i]);
release_one_tx_pool(adapter, &adapter->tso_pool[i]);
}
kfree(adapter->tx_pool);
adapter->tx_pool = NULL;
kfree(adapter->tso_pool);
adapter->tso_pool = NULL;
adapter->num_active_tx_pools = 0;
adapter->prev_tx_pool_size = 0;
}
static int init_one_tx_pool(struct net_device *netdev,
struct ibmvnic_tx_pool *tx_pool,
int pool_size, int buf_size)
{
int i;
tx_pool->tx_buff = kcalloc(pool_size,
sizeof(struct ibmvnic_tx_buff),
GFP_KERNEL);
if (!tx_pool->tx_buff)
return -ENOMEM;
tx_pool->free_map = kcalloc(pool_size, sizeof(int), GFP_KERNEL);
if (!tx_pool->free_map) {
kfree(tx_pool->tx_buff);
tx_pool->tx_buff = NULL;
return -ENOMEM;
}
for (i = 0; i < pool_size; i++)
tx_pool->free_map[i] = i;
tx_pool->consumer_index = 0;
tx_pool->producer_index = 0;
tx_pool->num_buffers = pool_size;
tx_pool->buf_size = buf_size;
return 0;
}
/**
* reuse_tx_pools() - Check if the existing tx pools can be reused.
* @adapter: ibmvnic adapter
*
* Check if the existing tx pools in the adapter can be reused. The
* pools can be reused if the pool parameters (number of pools,
* number of buffers in the pool and mtu) have not changed.
*
* NOTE: This assumes that all pools have the same number of buffers
* which is the case currently. If that changes, we must fix this.
*
* Return: true if the tx pools can be reused, false otherwise.
*/
static bool reuse_tx_pools(struct ibmvnic_adapter *adapter)
{
u64 old_num_pools, new_num_pools;
u64 old_pool_size, new_pool_size;
u64 old_mtu, new_mtu;
if (!adapter->tx_pool)
return false;
old_num_pools = adapter->num_active_tx_pools;
new_num_pools = adapter->num_active_tx_scrqs;
old_pool_size = adapter->prev_tx_pool_size;
new_pool_size = adapter->req_tx_entries_per_subcrq;
old_mtu = adapter->prev_mtu;
new_mtu = adapter->req_mtu;
if (old_mtu != new_mtu ||
old_num_pools != new_num_pools ||
old_pool_size != new_pool_size)
return false;
return true;
}
/**
* init_tx_pools(): Initialize the set of transmit pools in the adapter.
* @netdev: net device associated with the vnic interface
*
* Initialize the set of transmit pools in the ibmvnic adapter associated
* with the net_device @netdev. If possible, reuse the existing tx pools.
* Otherwise free any existing pools and allocate a new set of pools
* before initializing them.
*
* Return: 0 on success and negative value on error.
*/
static int init_tx_pools(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
struct device *dev = &adapter->vdev->dev;
int num_pools;
u64 pool_size; /* # of buffers in pool */
u64 buff_size;
int i, j, rc;
num_pools = adapter->req_tx_queues;
/* We must notify the VIOS about the LTB on all resets - but we only
* need to alloc/populate pools if either the number of buffers or
* size of each buffer in the pool has changed.
*/
if (reuse_tx_pools(adapter)) {
netdev_dbg(netdev, "Reusing tx pools\n");
goto update_ltb;
}
/* Allocate/populate the pools. */
release_tx_pools(adapter);
pool_size = adapter->req_tx_entries_per_subcrq;
num_pools = adapter->num_active_tx_scrqs;
adapter->tx_pool = kcalloc(num_pools,
sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
if (!adapter->tx_pool)
return -ENOMEM;
adapter->tso_pool = kcalloc(num_pools,
sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
/* To simplify release_tx_pools() ensure that ->tx_pool and
* ->tso_pool are either both NULL or both non-NULL.
*/
if (!adapter->tso_pool) {
kfree(adapter->tx_pool);
adapter->tx_pool = NULL;
return -ENOMEM;
}
/* Set num_active_tx_pools early. If we fail below after partial
* allocation, release_tx_pools() will know how many to look for.
*/
adapter->num_active_tx_pools = num_pools;
buff_size = adapter->req_mtu + VLAN_HLEN;
buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
for (i = 0; i < num_pools; i++) {
dev_dbg(dev, "Init tx pool %d [%llu, %llu]\n",
i, adapter->req_tx_entries_per_subcrq, buff_size);
rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
pool_size, buff_size);
if (rc)
goto out_release;
rc = init_one_tx_pool(netdev, &adapter->tso_pool[i],
IBMVNIC_TSO_BUFS,
IBMVNIC_TSO_BUF_SZ);
if (rc)
goto out_release;
}
adapter->prev_tx_pool_size = pool_size;
adapter->prev_mtu = adapter->req_mtu;
update_ltb:
/* NOTE: All tx_pools have the same number of buffers (which is
* same as pool_size). All tso_pools have IBMVNIC_TSO_BUFS
* buffers (see calls init_one_tx_pool() for these).
* For consistency, we use tx_pool->num_buffers and
* tso_pool->num_buffers below.
*/
rc = -1;
for (i = 0; i < num_pools; i++) {
struct ibmvnic_tx_pool *tso_pool;
struct ibmvnic_tx_pool *tx_pool;
tx_pool = &adapter->tx_pool[i];
dev_dbg(dev, "Updating LTB for tx pool %d [%d, %d]\n",
i, tx_pool->num_buffers, tx_pool->buf_size);
rc = alloc_ltb_set(adapter, &tx_pool->ltb_set,
tx_pool->num_buffers, tx_pool->buf_size);
if (rc)
goto out;
tx_pool->consumer_index = 0;
tx_pool->producer_index = 0;
for (j = 0; j < tx_pool->num_buffers; j++)
tx_pool->free_map[j] = j;
tso_pool = &adapter->tso_pool[i];
dev_dbg(dev, "Updating LTB for tso pool %d [%d, %d]\n",
i, tso_pool->num_buffers, tso_pool->buf_size);
rc = alloc_ltb_set(adapter, &tso_pool->ltb_set,
tso_pool->num_buffers, tso_pool->buf_size);
if (rc)
goto out;
tso_pool->consumer_index = 0;
tso_pool->producer_index = 0;
for (j = 0; j < tso_pool->num_buffers; j++)
tso_pool->free_map[j] = j;
}
return 0;
out_release:
release_tx_pools(adapter);
out:
/* We failed to allocate one or more LTBs or map them on the VIOS.
* Hold onto the pools and any LTBs that we did allocate/map.
*/
return rc;
}
static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter)
{
int i;
if (adapter->napi_enabled)
return;
for (i = 0; i < adapter->req_rx_queues; i++)
napi_enable(&adapter->napi[i]);
adapter->napi_enabled = true;
}
static void ibmvnic_napi_disable(struct ibmvnic_adapter *adapter)
{
int i;
if (!adapter->napi_enabled)
return;
for (i = 0; i < adapter->req_rx_queues; i++) {
netdev_dbg(adapter->netdev, "Disabling napi[%d]\n", i);
napi_disable(&adapter->napi[i]);
}
adapter->napi_enabled = false;
}
static int init_napi(struct ibmvnic_adapter *adapter)
{
int i;
adapter->napi = kcalloc(adapter->req_rx_queues,
sizeof(struct napi_struct), GFP_KERNEL);
if (!adapter->napi)
return -ENOMEM;
for (i = 0; i < adapter->req_rx_queues; i++) {
netdev_dbg(adapter->netdev, "Adding napi[%d]\n", i);
netif_napi_add(adapter->netdev, &adapter->napi[i],
ibmvnic_poll, NAPI_POLL_WEIGHT);
}
adapter->num_active_rx_napi = adapter->req_rx_queues;
return 0;
}
static void release_napi(struct ibmvnic_adapter *adapter)
{
int i;
if (!adapter->napi)
return;
for (i = 0; i < adapter->num_active_rx_napi; i++) {
netdev_dbg(adapter->netdev, "Releasing napi[%d]\n", i);
netif_napi_del(&adapter->napi[i]);
}
kfree(adapter->napi);
adapter->napi = NULL;
adapter->num_active_rx_napi = 0;
adapter->napi_enabled = false;
}
static const char *adapter_state_to_string(enum vnic_state state)
{
switch (state) {
case VNIC_PROBING:
return "PROBING";
case VNIC_PROBED:
return "PROBED";
case VNIC_OPENING:
return "OPENING";
case VNIC_OPEN:
return "OPEN";
case VNIC_CLOSING:
return "CLOSING";
case VNIC_CLOSED:
return "CLOSED";
case VNIC_REMOVING:
return "REMOVING";
case VNIC_REMOVED:
return "REMOVED";
case VNIC_DOWN:
return "DOWN";
}
return "UNKNOWN";
}
static int ibmvnic_login(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
unsigned long timeout = msecs_to_jiffies(20000);
int retry_count = 0;
int retries = 10;
bool retry;
int rc;
do {
retry = false;
if (retry_count > retries) {
netdev_warn(netdev, "Login attempts exceeded\n");
return -EACCES;
}
adapter->init_done_rc = 0;
reinit_completion(&adapter->init_done);
rc = send_login(adapter);
if (rc)
return rc;
if (!wait_for_completion_timeout(&adapter->init_done,
timeout)) {
netdev_warn(netdev, "Login timed out, retrying...\n");
retry = true;
adapter->init_done_rc = 0;
retry_count++;
continue;
}
if (adapter->init_done_rc == ABORTED) {
netdev_warn(netdev, "Login aborted, retrying...\n");
retry = true;
adapter->init_done_rc = 0;
retry_count++;
/* FW or device may be busy, so
* wait a bit before retrying login
*/
msleep(500);
} else if (adapter->init_done_rc == PARTIALSUCCESS) {
retry_count++;
release_sub_crqs(adapter, 1);
retry = true;
netdev_dbg(netdev,
"Received partial success, retrying...\n");
adapter->init_done_rc = 0;
reinit_completion(&adapter->init_done);
send_query_cap(adapter);
if (!wait_for_completion_timeout(&adapter->init_done,
timeout)) {
netdev_warn(netdev,
"Capabilities query timed out\n");
return -ETIMEDOUT;
}
rc = init_sub_crqs(adapter);
if (rc) {
netdev_warn(netdev,
"SCRQ initialization failed\n");
return rc;
}
rc = init_sub_crq_irqs(adapter);
if (rc) {
netdev_warn(netdev,
"SCRQ irq initialization failed\n");
return rc;
}
} else if (adapter->init_done_rc) {
netdev_warn(netdev, "Adapter login failed, init_done_rc = %d\n",
adapter->init_done_rc);
return -EIO;
}
} while (retry);
__ibmvnic_set_mac(netdev, adapter->mac_addr);
netdev_dbg(netdev, "[S:%s] Login succeeded\n", adapter_state_to_string(adapter->state));
return 0;
}
static void release_login_buffer(struct ibmvnic_adapter *adapter)
{
kfree(adapter->login_buf);
adapter->login_buf = NULL;
}
static void release_login_rsp_buffer(struct ibmvnic_adapter *adapter)
{
kfree(adapter->login_rsp_buf);
adapter->login_rsp_buf = NULL;
}
static void release_resources(struct ibmvnic_adapter *adapter)
{
release_vpd_data(adapter);
release_napi(adapter);
release_login_buffer(adapter);
release_login_rsp_buffer(adapter);
}
static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state)
{
struct net_device *netdev = adapter->netdev;
unsigned long timeout = msecs_to_jiffies(20000);
union ibmvnic_crq crq;
bool resend;
int rc;
netdev_dbg(netdev, "setting link state %d\n", link_state);
memset(&crq, 0, sizeof(crq));
crq.logical_link_state.first = IBMVNIC_CRQ_CMD;
crq.logical_link_state.cmd = LOGICAL_LINK_STATE;
crq.logical_link_state.link_state = link_state;
do {
resend = false;
reinit_completion(&adapter->init_done);
rc = ibmvnic_send_crq(adapter, &crq);
if (rc) {
netdev_err(netdev, "Failed to set link state\n");
return rc;
}
if (!wait_for_completion_timeout(&adapter->init_done,
timeout)) {
netdev_err(netdev, "timeout setting link state\n");
return -ETIMEDOUT;
}
if (adapter->init_done_rc == PARTIALSUCCESS) {
/* Partuial success, delay and re-send */
mdelay(1000);
resend = true;
} else if (adapter->init_done_rc) {
netdev_warn(netdev, "Unable to set link state, rc=%d\n",
adapter->init_done_rc);
return adapter->init_done_rc;
}
} while (resend);
return 0;
}
static int set_real_num_queues(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int rc;
netdev_dbg(netdev, "Setting real tx/rx queues (%llx/%llx)\n",
adapter->req_tx_queues, adapter->req_rx_queues);
rc = netif_set_real_num_tx_queues(netdev, adapter->req_tx_queues);
if (rc) {
netdev_err(netdev, "failed to set the number of tx queues\n");
return rc;
}
rc = netif_set_real_num_rx_queues(netdev, adapter->req_rx_queues);
if (rc)
netdev_err(netdev, "failed to set the number of rx queues\n");
return rc;
}
static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
union ibmvnic_crq crq;
int len = 0;
int rc;
if (adapter->vpd->buff)
len = adapter->vpd->len;
mutex_lock(&adapter->fw_lock);
adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
crq.get_vpd_size.cmd = GET_VPD_SIZE;
rc = ibmvnic_send_crq(adapter, &crq);
if (rc) {
mutex_unlock(&adapter->fw_lock);
return rc;
}
rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
if (rc) {
dev_err(dev, "Could not retrieve VPD size, rc = %d\n", rc);
mutex_unlock(&adapter->fw_lock);
return rc;
}
mutex_unlock(&adapter->fw_lock);
if (!adapter->vpd->len)
return -ENODATA;
if (!adapter->vpd->buff)
adapter->vpd->buff = kzalloc(adapter->vpd->len, GFP_KERNEL);
else if (adapter->vpd->len != len)
adapter->vpd->buff =
krealloc(adapter->vpd->buff,
adapter->vpd->len, GFP_KERNEL);
if (!adapter->vpd->buff) {
dev_err(dev, "Could allocate VPD buffer\n");
return -ENOMEM;
}
adapter->vpd->dma_addr =
dma_map_single(dev, adapter->vpd->buff, adapter->vpd->len,
DMA_FROM_DEVICE);
if (dma_mapping_error(dev, adapter->vpd->dma_addr)) {
dev_err(dev, "Could not map VPD buffer\n");
kfree(adapter->vpd->buff);
adapter->vpd->buff = NULL;
return -ENOMEM;
}
mutex_lock(&adapter->fw_lock);
adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
crq.get_vpd.first = IBMVNIC_CRQ_CMD;
crq.get_vpd.cmd = GET_VPD;
crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);
crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len);
rc = ibmvnic_send_crq(adapter, &crq);
if (rc) {
kfree(adapter->vpd->buff);
adapter->vpd->buff = NULL;
mutex_unlock(&adapter->fw_lock);
return rc;
}
rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
if (rc) {
dev_err(dev, "Unable to retrieve VPD, rc = %d\n", rc);
kfree(adapter->vpd->buff);
adapter->vpd->buff = NULL;
mutex_unlock(&adapter->fw_lock);
return rc;
}
mutex_unlock(&adapter->fw_lock);
return 0;
}
static int init_resources(struct ibmvnic_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
int rc;
rc = set_real_num_queues(netdev);
if (rc)
return rc;
adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL);
if (!adapter->vpd)
return -ENOMEM;
/* Vital Product Data (VPD) */
rc = ibmvnic_get_vpd(adapter);
if (rc) {
netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n");
return rc;
}
rc = init_napi(adapter);
if (rc)
return rc;
send_query_map(adapter);
rc = init_rx_pools(netdev);
if (rc)
return rc;
rc = init_tx_pools(netdev);
return rc;
}
static int __ibmvnic_open(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
enum vnic_state prev_state = adapter->state;
int i, rc;
adapter->state = VNIC_OPENING;
replenish_pools(adapter);
ibmvnic_napi_enable(adapter);
/* We're ready to receive frames, enable the sub-crq interrupts and
* set the logical link state to up
*/
for (i = 0; i < adapter->req_rx_queues; i++) {
netdev_dbg(netdev, "Enabling rx_scrq[%d] irq\n", i);
if (prev_state == VNIC_CLOSED)
enable_irq(adapter->rx_scrq[i]->irq);
enable_scrq_irq(adapter, adapter->rx_scrq[i]);
}
for (i = 0; i < adapter->req_tx_queues; i++) {
netdev_dbg(netdev, "Enabling tx_scrq[%d] irq\n", i);
if (prev_state == VNIC_CLOSED)
enable_irq(adapter->tx_scrq[i]->irq);
enable_scrq_irq(adapter, adapter->tx_scrq[i]);
netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
}
rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);
if (rc) {
ibmvnic_napi_disable(adapter);
ibmvnic_disable_irqs(adapter);
return rc;
}
adapter->tx_queues_active = true;
/* Since queues were stopped until now, there shouldn't be any
* one in ibmvnic_complete_tx() or ibmvnic_xmit() so maybe we
* don't need the synchronize_rcu()? Leaving it for consistency
* with setting ->tx_queues_active = false.
*/
synchronize_rcu();
netif_tx_start_all_queues(netdev);
if (prev_state == VNIC_CLOSED) {
for (i = 0; i < adapter->req_rx_queues; i++)
napi_schedule(&adapter->napi[i]);
}
adapter->state = VNIC_OPEN;
return rc;
}
static int ibmvnic_open(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int rc;
ASSERT_RTNL();
/* If device failover is pending or we are about to reset, just set
* device state and return. Device operation will be handled by reset
* routine.
*
* It should be safe to overwrite the adapter->state here. Since
* we hold the rtnl, either the reset has not actually started or
* the rtnl got dropped during the set_link_state() in do_reset().
* In the former case, no one else is changing the state (again we
* have the rtnl) and in the latter case, do_reset() will detect and
* honor our setting below.
*/
if (adapter->failover_pending || (test_bit(0, &adapter->resetting))) {
netdev_dbg(netdev, "[S:%s FOP:%d] Resetting, deferring open\n",
adapter_state_to_string(adapter->state),
adapter->failover_pending);
adapter->state = VNIC_OPEN;
rc = 0;
goto out;
}
if (adapter->state != VNIC_CLOSED) {
rc = ibmvnic_login(netdev);
if (rc)
goto out;
rc = init_resources(adapter);
if (rc) {
netdev_err(netdev, "failed to initialize resources\n");
goto out;
}
}
rc = __ibmvnic_open(netdev);
out:
/* If open failed and there is a pending failover or in-progress reset,
* set device state and return. Device operation will be handled by
* reset routine. See also comments above regarding rtnl.
*/
if (rc &&
(adapter->failover_pending || (test_bit(0, &adapter->resetting)))) {
adapter->state = VNIC_OPEN;
rc = 0;
}
if (rc) {
release_resources(adapter);
release_rx_pools(adapter);
release_tx_pools(adapter);
}
return rc;
}
static void clean_rx_pools(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_rx_pool *rx_pool;
struct ibmvnic_rx_buff *rx_buff;
u64 rx_entries;
int rx_scrqs;
int i, j;
if (!adapter->rx_pool)
return;
rx_scrqs = adapter->num_active_rx_pools;
rx_entries = adapter->req_rx_add_entries_per_subcrq;
/* Free any remaining skbs in the rx buffer pools */
for (i = 0; i < rx_scrqs; i++) {
rx_pool = &adapter->rx_pool[i];
if (!rx_pool || !rx_pool->rx_buff)
continue;
netdev_dbg(adapter->netdev, "Cleaning rx_pool[%d]\n", i);
for (j = 0; j < rx_entries; j++) {
rx_buff = &rx_pool->rx_buff[j];
if (rx_buff && rx_buff->skb) {
dev_kfree_skb_any(rx_buff->skb);
rx_buff->skb = NULL;
}
}
}
}
static void clean_one_tx_pool(struct ibmvnic_adapter *adapter,
struct ibmvnic_tx_pool *tx_pool)
{
struct ibmvnic_tx_buff *tx_buff;
u64 tx_entries;
int i;
if (!tx_pool || !tx_pool->tx_buff)
return;
tx_entries = tx_pool->num_buffers;
for (i = 0; i < tx_entries; i++) {
tx_buff = &tx_pool->tx_buff[i];
if (tx_buff && tx_buff->skb) {
dev_kfree_skb_any(tx_buff->skb);
tx_buff->skb = NULL;
}
}
}
static void clean_tx_pools(struct ibmvnic_adapter *adapter)
{
int tx_scrqs;
int i;
if (!adapter->tx_pool || !adapter->tso_pool)
return;
tx_scrqs = adapter->num_active_tx_pools;
/* Free any remaining skbs in the tx buffer pools */
for (i = 0; i < tx_scrqs; i++) {
netdev_dbg(adapter->netdev, "Cleaning tx_pool[%d]\n", i);
clean_one_tx_pool(adapter, &adapter->tx_pool[i]);
clean_one_tx_pool(adapter, &adapter->tso_pool[i]);
}
}
static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
int i;
if (adapter->tx_scrq) {
for (i = 0; i < adapter->req_tx_queues; i++)
if (adapter->tx_scrq[i]->irq) {
netdev_dbg(netdev,
"Disabling tx_scrq[%d] irq\n", i);
disable_scrq_irq(adapter, adapter->tx_scrq[i]);
disable_irq(adapter->tx_scrq[i]->irq);
}
}
if (adapter->rx_scrq) {
for (i = 0; i < adapter->req_rx_queues; i++) {
if (adapter->rx_scrq[i]->irq) {
netdev_dbg(netdev,
"Disabling rx_scrq[%d] irq\n", i);
disable_scrq_irq(adapter, adapter->rx_scrq[i]);
disable_irq(adapter->rx_scrq[i]->irq);
}
}
}
}
static void ibmvnic_cleanup(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
/* ensure that transmissions are stopped if called by do_reset */
adapter->tx_queues_active = false;
/* Ensure complete_tx() and ibmvnic_xmit() see ->tx_queues_active
* update so they don't restart a queue after we stop it below.
*/
synchronize_rcu();
if (test_bit(0, &adapter->resetting))
netif_tx_disable(netdev);
else
netif_tx_stop_all_queues(netdev);
ibmvnic_napi_disable(adapter);
ibmvnic_disable_irqs(adapter);
}
static int __ibmvnic_close(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int rc = 0;
adapter->state = VNIC_CLOSING;
rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
adapter->state = VNIC_CLOSED;
return rc;
}
static int ibmvnic_close(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int rc;
netdev_dbg(netdev, "[S:%s FOP:%d FRR:%d] Closing\n",
adapter_state_to_string(adapter->state),
adapter->failover_pending,
adapter->force_reset_recovery);
/* If device failover is pending, just set device state and return.
* Device operation will be handled by reset routine.
*/
if (adapter->failover_pending) {
adapter->state = VNIC_CLOSED;
return 0;
}
rc = __ibmvnic_close(netdev);
ibmvnic_cleanup(netdev);
clean_rx_pools(adapter);
clean_tx_pools(adapter);
return rc;
}
/**
* build_hdr_data - creates L2/L3/L4 header data buffer
* @hdr_field: bitfield determining needed headers
* @skb: socket buffer
* @hdr_len: array of header lengths
* @hdr_data: buffer to write the header to
*
* Reads hdr_field to determine which headers are needed by firmware.
* Builds a buffer containing these headers. Saves individual header
* lengths and total buffer length to be used to build descriptors.
*/
static int build_hdr_data(u8 hdr_field, struct sk_buff *skb,
int *hdr_len, u8 *hdr_data)
{
int len = 0;
u8 *hdr;
if (skb_vlan_tagged(skb) && !skb_vlan_tag_present(skb))
hdr_len[0] = sizeof(struct vlan_ethhdr);
else
hdr_len[0] = sizeof(struct ethhdr);
if (skb->protocol == htons(ETH_P_IP)) {
hdr_len[1] = ip_hdr(skb)->ihl * 4;
if (ip_hdr(skb)->protocol == IPPROTO_TCP)
hdr_len[2] = tcp_hdrlen(skb);
else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
hdr_len[2] = sizeof(struct udphdr);
} else if (skb->protocol == htons(ETH_P_IPV6)) {
hdr_len[1] = sizeof(struct ipv6hdr);
if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
hdr_len[2] = tcp_hdrlen(skb);
else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
hdr_len[2] = sizeof(struct udphdr);
} else if (skb->protocol == htons(ETH_P_ARP)) {
hdr_len[1] = arp_hdr_len(skb->dev);
hdr_len[2] = 0;
}
memset(hdr_data, 0, 120);
if ((hdr_field >> 6) & 1) {
hdr = skb_mac_header(skb);
memcpy(hdr_data, hdr, hdr_len[0]);
len += hdr_len[0];
}
if ((hdr_field >> 5) & 1) {
hdr = skb_network_header(skb);
memcpy(hdr_data + len, hdr, hdr_len[1]);
len += hdr_len[1];
}
if ((hdr_field >> 4) & 1) {
hdr = skb_transport_header(skb);
memcpy(hdr_data + len, hdr, hdr_len[2]);
len += hdr_len[2];
}
return len;
}
/**
* create_hdr_descs - create header and header extension descriptors
* @hdr_field: bitfield determining needed headers
* @hdr_data: buffer containing header data
* @len: length of data buffer
* @hdr_len: array of individual header lengths
* @scrq_arr: descriptor array
*
* Creates header and, if needed, header extension descriptors and
* places them in a descriptor array, scrq_arr
*/
static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
union sub_crq *scrq_arr)
{
union sub_crq hdr_desc;
int tmp_len = len;
int num_descs = 0;
u8 *data, *cur;
int tmp;
while (tmp_len > 0) {
cur = hdr_data + len - tmp_len;
memset(&hdr_desc, 0, sizeof(hdr_desc));
if (cur != hdr_data) {
data = hdr_desc.hdr_ext.data;
tmp = tmp_len > 29 ? 29 : tmp_len;
hdr_desc.hdr_ext.first = IBMVNIC_CRQ_CMD;
hdr_desc.hdr_ext.type = IBMVNIC_HDR_EXT_DESC;
hdr_desc.hdr_ext.len = tmp;
} else {
data = hdr_desc.hdr.data;
tmp = tmp_len > 24 ? 24 : tmp_len;
hdr_desc.hdr.first = IBMVNIC_CRQ_CMD;
hdr_desc.hdr.type = IBMVNIC_HDR_DESC;
hdr_desc.hdr.len = tmp;
hdr_desc.hdr.l2_len = (u8)hdr_len[0];
hdr_desc.hdr.l3_len = cpu_to_be16((u16)hdr_len[1]);
hdr_desc.hdr.l4_len = (u8)hdr_len[2];
hdr_desc.hdr.flag = hdr_field << 1;
}
memcpy(data, cur, tmp);
tmp_len -= tmp;
*scrq_arr = hdr_desc;
scrq_arr++;
num_descs++;
}
return num_descs;
}
/**
* build_hdr_descs_arr - build a header descriptor array
* @skb: tx socket buffer
* @indir_arr: indirect array
* @num_entries: number of descriptors to be sent
* @hdr_field: bit field determining which headers will be sent
*
* This function will build a TX descriptor array with applicable
* L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
*/
static void build_hdr_descs_arr(struct sk_buff *skb,
union sub_crq *indir_arr,
int *num_entries, u8 hdr_field)
{
int hdr_len[3] = {0, 0, 0};
u8 hdr_data[140] = {0};
int tot_len;
tot_len = build_hdr_data(hdr_field, skb, hdr_len,
hdr_data);
*num_entries += create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len,
indir_arr + 1);
}
static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
struct net_device *netdev)
{
/* For some backing devices, mishandling of small packets
* can result in a loss of connection or TX stall. Device
* architects recommend that no packet should be smaller
* than the minimum MTU value provided to the driver, so
* pad any packets to that length
*/
if (skb->len < netdev->min_mtu)
return skb_put_padto(skb, netdev->min_mtu);
return 0;
}
static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *tx_scrq)
{
struct ibmvnic_ind_xmit_queue *ind_bufp;
struct ibmvnic_tx_buff *tx_buff;
struct ibmvnic_tx_pool *tx_pool;
union sub_crq tx_scrq_entry;
int queue_num;
int entries;
int index;
int i;
ind_bufp = &tx_scrq->ind_buf;
entries = (u64)ind_bufp->index;
queue_num = tx_scrq->pool_index;
for (i = entries - 1; i >= 0; --i) {
tx_scrq_entry = ind_bufp->indir_arr[i];
if (tx_scrq_entry.v1.type != IBMVNIC_TX_DESC)
continue;
index = be32_to_cpu(tx_scrq_entry.v1.correlator);
if (index & IBMVNIC_TSO_POOL_MASK) {
tx_pool = &adapter->tso_pool[queue_num];
index &= ~IBMVNIC_TSO_POOL_MASK;
} else {
tx_pool = &adapter->tx_pool[queue_num];
}
tx_pool->free_map[tx_pool->consumer_index] = index;
tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
tx_pool->num_buffers - 1 :
tx_pool->consumer_index - 1;
tx_buff = &tx_pool->tx_buff[index];
adapter->netdev->stats.tx_packets--;
adapter->netdev->stats.tx_bytes -= tx_buff->skb->len;
adapter->tx_stats_buffers[queue_num].packets--;
adapter->tx_stats_buffers[queue_num].bytes -=
tx_buff->skb->len;
dev_kfree_skb_any(tx_buff->skb);
tx_buff->skb = NULL;
adapter->netdev->stats.tx_dropped++;
}
ind_bufp->index = 0;
if (atomic_sub_return(entries, &tx_scrq->used) <=
(adapter->req_tx_entries_per_subcrq / 2) &&
__netif_subqueue_stopped(adapter->netdev, queue_num)) {
rcu_read_lock();
if (adapter->tx_queues_active) {
netif_wake_subqueue(adapter->netdev, queue_num);
netdev_dbg(adapter->netdev, "Started queue %d\n",
queue_num);
}
rcu_read_unlock();
}
}
static int ibmvnic_tx_scrq_flush(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *tx_scrq)
{
struct ibmvnic_ind_xmit_queue *ind_bufp;
u64 dma_addr;
u64 entries;
u64 handle;
int rc;
ind_bufp = &tx_scrq->ind_buf;
dma_addr = (u64)ind_bufp->indir_dma;
entries = (u64)ind_bufp->index;
handle = tx_scrq->handle;
if (!entries)
return 0;
rc = send_subcrq_indirect(adapter, handle, dma_addr, entries);
if (rc)
ibmvnic_tx_scrq_clean_buffer(adapter, tx_scrq);
else
ind_bufp->index = 0;
return 0;
}
static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int queue_num = skb_get_queue_mapping(skb);
u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req;
struct device *dev = &adapter->vdev->dev;
struct ibmvnic_ind_xmit_queue *ind_bufp;
struct ibmvnic_tx_buff *tx_buff = NULL;
struct ibmvnic_sub_crq_queue *tx_scrq;
struct ibmvnic_long_term_buff *ltb;
struct ibmvnic_tx_pool *tx_pool;
unsigned int tx_send_failed = 0;
netdev_tx_t ret = NETDEV_TX_OK;
unsigned int tx_map_failed = 0;
union sub_crq indir_arr[16];
unsigned int tx_dropped = 0;
unsigned int tx_packets = 0;
unsigned int tx_bytes = 0;
dma_addr_t data_dma_addr;
struct netdev_queue *txq;
unsigned long lpar_rc;
union sub_crq tx_crq;
unsigned int offset;
int num_entries = 1;
unsigned char *dst;
int bufidx = 0;
u8 proto = 0;
/* If a reset is in progress, drop the packet since
* the scrqs may get torn down. Otherwise use the
* rcu to ensure reset waits for us to complete.
*/
rcu_read_lock();
if (!adapter->tx_queues_active) {
dev_kfree_skb_any(skb);
tx_send_failed++;
tx_dropped++;
ret = NETDEV_TX_OK;
goto out;
}
tx_scrq = adapter->tx_scrq[queue_num];
txq = netdev_get_tx_queue(netdev, queue_num);
ind_bufp = &tx_scrq->ind_buf;
if (ibmvnic_xmit_workarounds(skb, netdev)) {
tx_dropped++;
tx_send_failed++;
ret = NETDEV_TX_OK;
ibmvnic_tx_scrq_flush(adapter, tx_scrq);
goto out;
}
if (skb_is_gso(skb))
tx_pool = &adapter->tso_pool[queue_num];
else
tx_pool = &adapter->tx_pool[queue_num];
bufidx = tx_pool->free_map[tx_pool->consumer_index];
if (bufidx == IBMVNIC_INVALID_MAP) {
dev_kfree_skb_any(skb);
tx_send_failed++;
tx_dropped++;
ibmvnic_tx_scrq_flush(adapter, tx_scrq);
ret = NETDEV_TX_OK;
goto out;
}
tx_pool->free_map[tx_pool->consumer_index] = IBMVNIC_INVALID_MAP;
map_txpool_buf_to_ltb(tx_pool, bufidx, &ltb, &offset);
dst = ltb->buff + offset;
memset(dst, 0, tx_pool->buf_size);
data_dma_addr = ltb->addr + offset;
if (skb_shinfo(skb)->nr_frags) {
int cur, i;
/* Copy the head */
skb_copy_from_linear_data(skb, dst, skb_headlen(skb));
cur = skb_headlen(skb);
/* Copy the frags */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
memcpy(dst + cur, skb_frag_address(frag),
skb_frag_size(frag));
cur += skb_frag_size(frag);
}
} else {
skb_copy_from_linear_data(skb, dst, skb->len);
}
/* post changes to long_term_buff *dst before VIOS accessing it */
dma_wmb();
tx_pool->consumer_index =
(tx_pool->consumer_index + 1) % tx_pool->num_buffers;
tx_buff = &tx_pool->tx_buff[bufidx];
tx_buff->skb = skb;
tx_buff->index = bufidx;
tx_buff->pool_index = queue_num;
memset(&tx_crq, 0, sizeof(tx_crq));
tx_crq.v1.first = IBMVNIC_CRQ_CMD;
tx_crq.v1.type = IBMVNIC_TX_DESC;
tx_crq.v1.n_crq_elem = 1;
tx_crq.v1.n_sge = 1;
tx_crq.v1.flags1 = IBMVNIC_TX_COMP_NEEDED;
if (skb_is_gso(skb))
tx_crq.v1.correlator =
cpu_to_be32(bufidx | IBMVNIC_TSO_POOL_MASK);
else
tx_crq.v1.correlator = cpu_to_be32(bufidx);
tx_crq.v1.dma_reg = cpu_to_be16(ltb->map_id);
tx_crq.v1.sge_len = cpu_to_be32(skb->len);
tx_crq.v1.ioba = cpu_to_be64(data_dma_addr);
if (adapter->vlan_header_insertion && skb_vlan_tag_present(skb)) {
tx_crq.v1.flags2 |= IBMVNIC_TX_VLAN_INSERT;
tx_crq.v1.vlan_id = cpu_to_be16(skb->vlan_tci);
}
if (skb->protocol == htons(ETH_P_IP)) {
tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV4;
proto = ip_hdr(skb)->protocol;
} else if (skb->protocol == htons(ETH_P_IPV6)) {
tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV6;
proto = ipv6_hdr(skb)->nexthdr;
}
if (proto == IPPROTO_TCP)
tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_TCP;
else if (proto == IPPROTO_UDP)
tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP;
if (skb->ip_summed == CHECKSUM_PARTIAL) {
tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD;
hdrs += 2;
}
if (skb_is_gso(skb)) {
tx_crq.v1.flags1 |= IBMVNIC_TX_LSO;
tx_crq.v1.mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
hdrs += 2;
}
if ((*hdrs >> 7) & 1)
build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs);
tx_crq.v1.n_crq_elem = num_entries;
tx_buff->num_entries = num_entries;
/* flush buffer if current entry can not fit */
if (num_entries + ind_bufp->index > IBMVNIC_MAX_IND_DESCS) {
lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
if (lpar_rc != H_SUCCESS)
goto tx_flush_err;
}
indir_arr[0] = tx_crq;
memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0],
num_entries * sizeof(struct ibmvnic_generic_scrq));
ind_bufp->index += num_entries;
if (__netdev_tx_sent_queue(txq, skb->len,
netdev_xmit_more() &&
ind_bufp->index < IBMVNIC_MAX_IND_DESCS)) {
lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
if (lpar_rc != H_SUCCESS)
goto tx_err;
}
if (atomic_add_return(num_entries, &tx_scrq->used)
>= adapter->req_tx_entries_per_subcrq) {
netdev_dbg(netdev, "Stopping queue %d\n", queue_num);
netif_stop_subqueue(netdev, queue_num);
}
tx_packets++;
tx_bytes += skb->len;
txq_trans_cond_update(txq);
ret = NETDEV_TX_OK;
goto out;
tx_flush_err:
dev_kfree_skb_any(skb);
tx_buff->skb = NULL;
tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
tx_pool->num_buffers - 1 :
tx_pool->consumer_index - 1;
tx_dropped++;
tx_err:
if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER)
dev_err_ratelimited(dev, "tx: send failed\n");
if (lpar_rc == H_CLOSED || adapter->failover_pending) {
/* Disable TX and report carrier off if queue is closed
* or pending failover.
* Firmware guarantees that a signal will be sent to the
* driver, triggering a reset or some other action.
*/
netif_tx_stop_all_queues(netdev);
netif_carrier_off(netdev);
}
out:
rcu_read_unlock();
netdev->stats.tx_dropped += tx_dropped;
netdev->stats.tx_bytes += tx_bytes;
netdev->stats.tx_packets += tx_packets;
adapter->tx_send_failed += tx_send_failed;
adapter->tx_map_failed += tx_map_failed;
adapter->tx_stats_buffers[queue_num].packets += tx_packets;
adapter->tx_stats_buffers[queue_num].bytes += tx_bytes;
adapter->tx_stats_buffers[queue_num].dropped_packets += tx_dropped;
return ret;
}
static void ibmvnic_set_multi(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
struct netdev_hw_addr *ha;
union ibmvnic_crq crq;
memset(&crq, 0, sizeof(crq));
crq.request_capability.first = IBMVNIC_CRQ_CMD;
crq.request_capability.cmd = REQUEST_CAPABILITY;
if (netdev->flags & IFF_PROMISC) {
if (!adapter->promisc_supported)
return;
} else {
if (netdev->flags & IFF_ALLMULTI) {
/* Accept all multicast */
memset(&crq, 0, sizeof(crq));
crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
crq.multicast_ctrl.cmd = MULTICAST_CTRL;
crq.multicast_ctrl.flags = IBMVNIC_ENABLE_ALL;
ibmvnic_send_crq(adapter, &crq);
} else if (netdev_mc_empty(netdev)) {
/* Reject all multicast */
memset(&crq, 0, sizeof(crq));
crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
crq.multicast_ctrl.cmd = MULTICAST_CTRL;
crq.multicast_ctrl.flags = IBMVNIC_DISABLE_ALL;
ibmvnic_send_crq(adapter, &crq);
} else {
/* Accept one or more multicast(s) */
netdev_for_each_mc_addr(ha, netdev) {
memset(&crq, 0, sizeof(crq));
crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
crq.multicast_ctrl.cmd = MULTICAST_CTRL;
crq.multicast_ctrl.flags = IBMVNIC_ENABLE_MC;
ether_addr_copy(&crq.multicast_ctrl.mac_addr[0],
ha->addr);
ibmvnic_send_crq(adapter, &crq);
}
}
}
}
static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
union ibmvnic_crq crq;
int rc;
if (!is_valid_ether_addr(dev_addr)) {
rc = -EADDRNOTAVAIL;
goto err;
}
memset(&crq, 0, sizeof(crq));
crq.change_mac_addr.first = IBMVNIC_CRQ_CMD;
crq.change_mac_addr.cmd = CHANGE_MAC_ADDR;
ether_addr_copy(&crq.change_mac_addr.mac_addr[0], dev_addr);
mutex_lock(&adapter->fw_lock);
adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
rc = ibmvnic_send_crq(adapter, &crq);
if (rc) {
rc = -EIO;
mutex_unlock(&adapter->fw_lock);
goto err;
}
rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
/* netdev->dev_addr is changed in handle_change_mac_rsp function */
if (rc || adapter->fw_done_rc) {
rc = -EIO;
mutex_unlock(&adapter->fw_lock);
goto err;
}
mutex_unlock(&adapter->fw_lock);
return 0;
err:
ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
return rc;
}
static int ibmvnic_set_mac(struct net_device *netdev, void *p)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
struct sockaddr *addr = p;
int rc;
rc = 0;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
ether_addr_copy(adapter->mac_addr, addr->sa_data);
if (adapter->state != VNIC_PROBED)
rc = __ibmvnic_set_mac(netdev, addr->sa_data);
return rc;
}
static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason)
{
switch (reason) {
case VNIC_RESET_FAILOVER:
return "FAILOVER";
case VNIC_RESET_MOBILITY:
return "MOBILITY";
case VNIC_RESET_FATAL:
return "FATAL";
case VNIC_RESET_NON_FATAL:
return "NON_FATAL";
case VNIC_RESET_TIMEOUT:
return "TIMEOUT";
case VNIC_RESET_CHANGE_PARAM:
return "CHANGE_PARAM";
case VNIC_RESET_PASSIVE_INIT:
return "PASSIVE_INIT";
}
return "UNKNOWN";
}
/*
* Initialize the init_done completion and return code values. We
* can get a transport event just after registering the CRQ and the
* tasklet will use this to communicate the transport event. To ensure
* we don't miss the notification/error, initialize these _before_
* regisering the CRQ.
*/
static inline void reinit_init_done(struct ibmvnic_adapter *adapter)
{
reinit_completion(&adapter->init_done);
adapter->init_done_rc = 0;
}
/*
* do_reset returns zero if we are able to keep processing reset events, or
* non-zero if we hit a fatal error and must halt.
*/
static int do_reset(struct ibmvnic_adapter *adapter,
struct ibmvnic_rwi *rwi, u32 reset_state)
{
struct net_device *netdev = adapter->netdev;
u64 old_num_rx_queues, old_num_tx_queues;
u64 old_num_rx_slots, old_num_tx_slots;
int rc;
netdev_dbg(adapter->netdev,
"[S:%s FOP:%d] Reset reason: %s, reset_state: %s\n",
adapter_state_to_string(adapter->state),
adapter->failover_pending,
reset_reason_to_string(rwi->reset_reason),
adapter_state_to_string(reset_state));
adapter->reset_reason = rwi->reset_reason;
/* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
rtnl_lock();
/* Now that we have the rtnl lock, clear any pending failover.
* This will ensure ibmvnic_open() has either completed or will
* block until failover is complete.
*/
if (rwi->reset_reason == VNIC_RESET_FAILOVER)
adapter->failover_pending = false;
/* read the state and check (again) after getting rtnl */
reset_state = adapter->state;
if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
rc = -EBUSY;
goto out;
}
netif_carrier_off(netdev);
old_num_rx_queues = adapter->req_rx_queues;
old_num_tx_queues = adapter->req_tx_queues;
old_num_rx_slots = adapter->req_rx_add_entries_per_subcrq;
old_num_tx_slots = adapter->req_tx_entries_per_subcrq;
ibmvnic_cleanup(netdev);
if (reset_state == VNIC_OPEN &&
adapter->reset_reason != VNIC_RESET_MOBILITY &&
adapter->reset_reason != VNIC_RESET_FAILOVER) {
if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
rc = __ibmvnic_close(netdev);
if (rc)
goto out;
} else {
adapter->state = VNIC_CLOSING;
/* Release the RTNL lock before link state change and
* re-acquire after the link state change to allow
* linkwatch_event to grab the RTNL lock and run during
* a reset.
*/
rtnl_unlock();
rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
rtnl_lock();
if (rc)
goto out;
if (adapter->state == VNIC_OPEN) {
/* When we dropped rtnl, ibmvnic_open() got
* it and noticed that we are resetting and
* set the adapter state to OPEN. Update our
* new "target" state, and resume the reset
* from VNIC_CLOSING state.
*/
netdev_dbg(netdev,
"Open changed state from %s, updating.\n",
adapter_state_to_string(reset_state));
reset_state = VNIC_OPEN;
adapter->state = VNIC_CLOSING;
}
if (adapter->state != VNIC_CLOSING) {
/* If someone else changed the adapter state
* when we dropped the rtnl, fail the reset
*/
rc = -EAGAIN;
goto out;
}
adapter->state = VNIC_CLOSED;
}
}
if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
release_resources(adapter);
release_sub_crqs(adapter, 1);
release_crq_queue(adapter);
}
if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
/* remove the closed state so when we call open it appears
* we are coming from the probed state.
*/
adapter->state = VNIC_PROBED;
reinit_init_done(adapter);
if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
rc = init_crq_queue(adapter);
} else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
rc = ibmvnic_reenable_crq_queue(adapter);
release_sub_crqs(adapter, 1);
} else {
rc = ibmvnic_reset_crq(adapter);
if (rc == H_CLOSED || rc == H_SUCCESS) {
rc = vio_enable_interrupts(adapter->vdev);
if (rc)
netdev_err(adapter->netdev,
"Reset failed to enable interrupts. rc=%d\n",
rc);
}
}
if (rc) {
netdev_err(adapter->netdev,
"Reset couldn't initialize crq. rc=%d\n", rc);
goto out;
}
rc = ibmvnic_reset_init(adapter, true);
if (rc)
goto out;
/* If the adapter was in PROBE or DOWN state prior to the reset,
* exit here.
*/
if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN) {
rc = 0;
goto out;
}
rc = ibmvnic_login(netdev);
if (rc)
goto out;
if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
rc = init_resources(adapter);
if (rc)
goto out;
} else if (adapter->req_rx_queues != old_num_rx_queues ||
adapter->req_tx_queues != old_num_tx_queues ||
adapter->req_rx_add_entries_per_subcrq !=
old_num_rx_slots ||
adapter->req_tx_entries_per_subcrq !=
old_num_tx_slots ||
!adapter->rx_pool ||
!adapter->tso_pool ||
!adapter->tx_pool) {
release_napi(adapter);
release_vpd_data(adapter);
rc = init_resources(adapter);
if (rc)
goto out;
} else {
rc = init_tx_pools(netdev);
if (rc) {
netdev_dbg(netdev,
"init tx pools failed (%d)\n",
rc);
goto out;
}
rc = init_rx_pools(netdev);
if (rc) {
netdev_dbg(netdev,
"init rx pools failed (%d)\n",
rc);
goto out;
}
}
ibmvnic_disable_irqs(adapter);
}
adapter->state = VNIC_CLOSED;
if (reset_state == VNIC_CLOSED) {
rc = 0;
goto out;
}
rc = __ibmvnic_open(netdev);
if (rc) {
rc = IBMVNIC_OPEN_FAILED;
goto out;
}
/* refresh device's multicast list */
ibmvnic_set_multi(netdev);
if (adapter->reset_reason == VNIC_RESET_FAILOVER ||
adapter->reset_reason == VNIC_RESET_MOBILITY)
__netdev_notify_peers(netdev);
rc = 0;
out:
/* restore the adapter state if reset failed */
if (rc)
adapter->state = reset_state;
/* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */
if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
rtnl_unlock();
netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Reset done, rc %d\n",
adapter_state_to_string(adapter->state),
adapter->failover_pending, rc);
return rc;
}
static int do_hard_reset(struct ibmvnic_adapter *adapter,
struct ibmvnic_rwi *rwi, u32 reset_state)
{
struct net_device *netdev = adapter->netdev;
int rc;
netdev_dbg(adapter->netdev, "Hard resetting driver (%s)\n",
reset_reason_to_string(rwi->reset_reason));
/* read the state and check (again) after getting rtnl */
reset_state = adapter->state;
if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
rc = -EBUSY;
goto out;
}
netif_carrier_off(netdev);
adapter->reset_reason = rwi->reset_reason;
ibmvnic_cleanup(netdev);
release_resources(adapter);
release_sub_crqs(adapter, 0);
release_crq_queue(adapter);
/* remove the closed state so when we call open it appears
* we are coming from the probed state.
*/
adapter->state = VNIC_PROBED;
reinit_init_done(adapter);
rc = init_crq_queue(adapter);
if (rc) {
netdev_err(adapter->netdev,
"Couldn't initialize crq. rc=%d\n", rc);
goto out;
}
rc = ibmvnic_reset_init(adapter, false);
if (rc)
goto out;
/* If the adapter was in PROBE or DOWN state prior to the reset,
* exit here.
*/
if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN)
goto out;
rc = ibmvnic_login(netdev);
if (rc)
goto out;
rc = init_resources(adapter);
if (rc)
goto out;
ibmvnic_disable_irqs(adapter);
adapter->state = VNIC_CLOSED;
if (reset_state == VNIC_CLOSED)
goto out;
rc = __ibmvnic_open(netdev);
if (rc) {
rc = IBMVNIC_OPEN_FAILED;
goto out;
}
__netdev_notify_peers(netdev);
out:
/* restore adapter state if reset failed */
if (rc)
adapter->state = reset_state;
netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Hard reset done, rc %d\n",
adapter_state_to_string(adapter->state),
adapter->failover_pending, rc);
return rc;
}
static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_rwi *rwi;
unsigned long flags;
spin_lock_irqsave(&adapter->rwi_lock, flags);
if (!list_empty(&adapter->rwi_list)) {
rwi = list_first_entry(&adapter->rwi_list, struct ibmvnic_rwi,
list);
list_del(&rwi->list);
} else {
rwi = NULL;
}
spin_unlock_irqrestore(&adapter->rwi_lock, flags);
return rwi;
}
/**
* do_passive_init - complete probing when partner device is detected.
* @adapter: ibmvnic_adapter struct
*
* If the ibmvnic device does not have a partner device to communicate with at boot
* and that partner device comes online at a later time, this function is called
* to complete the initialization process of ibmvnic device.
* Caller is expected to hold rtnl_lock().
*
* Returns non-zero if sub-CRQs are not initialized properly leaving the device
* in the down state.
* Returns 0 upon success and the device is in PROBED state.
*/
static int do_passive_init(struct ibmvnic_adapter *adapter)
{
unsigned long timeout = msecs_to_jiffies(30000);
struct net_device *netdev = adapter->netdev;
struct device *dev = &adapter->vdev->dev;
int rc;
netdev_dbg(netdev, "Partner device found, probing.\n");
adapter->state = VNIC_PROBING;
reinit_completion(&adapter->init_done);
adapter->init_done_rc = 0;
adapter->crq.active = true;
rc = send_crq_init_complete(adapter);
if (rc)
goto out;
rc = send_version_xchg(adapter);
if (rc)
netdev_dbg(adapter->netdev, "send_version_xchg failed, rc=%d\n", rc);
if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
dev_err(dev, "Initialization sequence timed out\n");
rc = -ETIMEDOUT;
goto out;
}
rc = init_sub_crqs(adapter);
if (rc) {
dev_err(dev, "Initialization of sub crqs failed, rc=%d\n", rc);
goto out;
}
rc = init_sub_crq_irqs(adapter);
if (rc) {
dev_err(dev, "Failed to initialize sub crq irqs\n, rc=%d", rc);
goto init_failed;
}
netdev->mtu = adapter->req_mtu - ETH_HLEN;
netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
adapter->state = VNIC_PROBED;
netdev_dbg(netdev, "Probed successfully. Waiting for signal from partner device.\n");
return 0;
init_failed:
release_sub_crqs(adapter, 1);
out:
adapter->state = VNIC_DOWN;
return rc;
}
static void __ibmvnic_reset(struct work_struct *work)
{
struct ibmvnic_adapter *adapter;
unsigned int timeout = 5000;
struct ibmvnic_rwi *tmprwi;
bool saved_state = false;
struct ibmvnic_rwi *rwi;
unsigned long flags;
struct device *dev;
bool need_reset;
int num_fails = 0;
u32 reset_state;
int rc = 0;
adapter = container_of(work, struct ibmvnic_adapter, ibmvnic_reset);
dev = &adapter->vdev->dev;
/* Wait for ibmvnic_probe() to complete. If probe is taking too long
* or if another reset is in progress, defer work for now. If probe
* eventually fails it will flush and terminate our work.
*
* Three possibilities here:
* 1. Adpater being removed - just return
* 2. Timed out on probe or another reset in progress - delay the work
* 3. Completed probe - perform any resets in queue
*/
if (adapter->state == VNIC_PROBING &&
!wait_for_completion_timeout(&adapter->probe_done, timeout)) {
dev_err(dev, "Reset thread timed out on probe");
queue_delayed_work(system_long_wq,
&adapter->ibmvnic_delayed_reset,
IBMVNIC_RESET_DELAY);
return;
}
/* adapter is done with probe (i.e state is never VNIC_PROBING now) */
if (adapter->state == VNIC_REMOVING)
return;
/* ->rwi_list is stable now (no one else is removing entries) */
/* ibmvnic_probe() may have purged the reset queue after we were
* scheduled to process a reset so there maybe no resets to process.
* Before setting the ->resetting bit though, we have to make sure
* that there is infact a reset to process. Otherwise we may race
* with ibmvnic_open() and end up leaving the vnic down:
*
* __ibmvnic_reset() ibmvnic_open()
* ----------------- --------------
*
* set ->resetting bit
* find ->resetting bit is set
* set ->state to IBMVNIC_OPEN (i.e
* assume reset will open device)
* return
* find reset queue empty
* return
*
* Neither performed vnic login/open and vnic stays down
*
* If we hold the lock and conditionally set the bit, either we
* or ibmvnic_open() will complete the open.
*/
need_reset = false;
spin_lock(&adapter->rwi_lock);
if (!list_empty(&adapter->rwi_list)) {
if (test_and_set_bit_lock(0, &adapter->resetting)) {
queue_delayed_work(system_long_wq,
&adapter->ibmvnic_delayed_reset,
IBMVNIC_RESET_DELAY);
} else {
need_reset = true;
}
}
spin_unlock(&adapter->rwi_lock);
if (!need_reset)
return;
rwi = get_next_rwi(adapter);
while (rwi) {
spin_lock_irqsave(&adapter->state_lock, flags);
if (adapter->state == VNIC_REMOVING ||
adapter->state == VNIC_REMOVED) {
spin_unlock_irqrestore(&adapter->state_lock, flags);
kfree(rwi);
rc = EBUSY;
break;
}
if (!saved_state) {
reset_state = adapter->state;
saved_state = true;
}
spin_unlock_irqrestore(&adapter->state_lock, flags);
if (rwi->reset_reason == VNIC_RESET_PASSIVE_INIT) {
rtnl_lock();
rc = do_passive_init(adapter);
rtnl_unlock();
if (!rc)
netif_carrier_on(adapter->netdev);
} else if (adapter->force_reset_recovery) {
/* Since we are doing a hard reset now, clear the
* failover_pending flag so we don't ignore any
* future MOBILITY or other resets.
*/
adapter->failover_pending = false;
/* Transport event occurred during previous reset */
if (adapter->wait_for_reset) {
/* Previous was CHANGE_PARAM; caller locked */
adapter->force_reset_recovery = false;
rc = do_hard_reset(adapter, rwi, reset_state);
} else {
rtnl_lock();
adapter->force_reset_recovery = false;
rc = do_hard_reset(adapter, rwi, reset_state);
rtnl_unlock();
}
if (rc)
num_fails++;
else
num_fails = 0;
/* If auto-priority-failover is enabled we can get
* back to back failovers during resets, resulting
* in at least two failed resets (from high-priority
* backing device to low-priority one and then back)
* If resets continue to fail beyond that, give the
* adapter some time to settle down before retrying.
*/
if (num_fails >= 3) {
netdev_dbg(adapter->netdev,
"[S:%s] Hard reset failed %d times, waiting 60 secs\n",
adapter_state_to_string(adapter->state),
num_fails);
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(60 * HZ);
}
} else {
rc = do_reset(adapter, rwi, reset_state);
}
tmprwi = rwi;
adapter->last_reset_time = jiffies;
if (rc)
netdev_dbg(adapter->netdev, "Reset failed, rc=%d\n", rc);
rwi = get_next_rwi(adapter);
/*
* If there is another reset queued, free the previous rwi
* and process the new reset even if previous reset failed
* (the previous reset could have failed because of a fail
* over for instance, so process the fail over).
*
* If there are no resets queued and the previous reset failed,
* the adapter would be in an undefined state. So retry the
* previous reset as a hard reset.
*/
if (rwi)
kfree(tmprwi);
else if (rc)
rwi = tmprwi;
if (rwi && (rwi->reset_reason == VNIC_RESET_FAILOVER ||
rwi->reset_reason == VNIC_RESET_MOBILITY || rc))
adapter->force_reset_recovery = true;
}
if (adapter->wait_for_reset) {
adapter->reset_done_rc = rc;
complete(&adapter->reset_done);
}
clear_bit_unlock(0, &adapter->resetting);
netdev_dbg(adapter->netdev,
"[S:%s FRR:%d WFR:%d] Done processing resets\n",
adapter_state_to_string(adapter->state),
adapter->force_reset_recovery,
adapter->wait_for_reset);
}
static void __ibmvnic_delayed_reset(struct work_struct *work)
{
struct ibmvnic_adapter *adapter;
adapter = container_of(work, struct ibmvnic_adapter,
ibmvnic_delayed_reset.work);
__ibmvnic_reset(&adapter->ibmvnic_reset);
}
static void flush_reset_queue(struct ibmvnic_adapter *adapter)
{
struct list_head *entry, *tmp_entry;
if (!list_empty(&adapter->rwi_list)) {
list_for_each_safe(entry, tmp_entry, &adapter->rwi_list) {
list_del(entry);
kfree(list_entry(entry, struct ibmvnic_rwi, list));
}
}
}
static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
enum ibmvnic_reset_reason reason)
{
struct net_device *netdev = adapter->netdev;
struct ibmvnic_rwi *rwi, *tmp;
unsigned long flags;
int ret;
spin_lock_irqsave(&adapter->rwi_lock, flags);
/* If failover is pending don't schedule any other reset.
* Instead let the failover complete. If there is already a
* a failover reset scheduled, we will detect and drop the
* duplicate reset when walking the ->rwi_list below.
*/
if (adapter->state == VNIC_REMOVING ||
adapter->state == VNIC_REMOVED ||
(adapter->failover_pending && reason != VNIC_RESET_FAILOVER)) {
ret = EBUSY;
netdev_dbg(netdev, "Adapter removing or pending failover, skipping reset\n");
goto err;
}
list_for_each_entry(tmp, &adapter->rwi_list, list) {
if (tmp->reset_reason == reason) {
netdev_dbg(netdev, "Skipping matching reset, reason=%s\n",
reset_reason_to_string(reason));
ret = EBUSY;
goto err;
}
}
rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC);
if (!rwi) {
ret = ENOMEM;
goto err;
}
/* if we just received a transport event,
* flush reset queue and process this reset
*/
if (adapter->force_reset_recovery)
flush_reset_queue(adapter);
rwi->reset_reason = reason;
list_add_tail(&rwi->list, &adapter->rwi_list);
netdev_dbg(adapter->netdev, "Scheduling reset (reason %s)\n",
reset_reason_to_string(reason));
queue_work(system_long_wq, &adapter->ibmvnic_reset);
ret = 0;
err:
/* ibmvnic_close() below can block, so drop the lock first */
spin_unlock_irqrestore(&adapter->rwi_lock, flags);
if (ret == ENOMEM)
ibmvnic_close(netdev);
return -ret;
}
static void ibmvnic_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
struct ibmvnic_adapter *adapter = netdev_priv(dev);
if (test_bit(0, &adapter->resetting)) {
netdev_err(adapter->netdev,
"Adapter is resetting, skip timeout reset\n");
return;
}
/* No queuing up reset until at least 5 seconds (default watchdog val)
* after last reset
*/
if (time_before(jiffies, (adapter->last_reset_time + dev->watchdog_timeo))) {
netdev_dbg(dev, "Not yet time to tx timeout.\n");
return;
}
ibmvnic_reset(adapter, VNIC_RESET_TIMEOUT);
}
static void remove_buff_from_pool(struct ibmvnic_adapter *adapter,
struct ibmvnic_rx_buff *rx_buff)
{
struct ibmvnic_rx_pool *pool = &adapter->rx_pool[rx_buff->pool_index];
rx_buff->skb = NULL;
pool->free_map[pool->next_alloc] = (int)(rx_buff - pool->rx_buff);
pool->next_alloc = (pool->next_alloc + 1) % pool->size;
atomic_dec(&pool->available);
}
static int ibmvnic_poll(struct napi_struct *napi, int budget)
{
struct ibmvnic_sub_crq_queue *rx_scrq;
struct ibmvnic_adapter *adapter;
struct net_device *netdev;
int frames_processed;
int scrq_num;
netdev = napi->dev;
adapter = netdev_priv(netdev);
scrq_num = (int)(napi - adapter->napi);
frames_processed = 0;
rx_scrq = adapter->rx_scrq[scrq_num];
restart_poll:
while (frames_processed < budget) {
struct sk_buff *skb;
struct ibmvnic_rx_buff *rx_buff;
union sub_crq *next;
u32 length;
u16 offset;
u8 flags = 0;
if (unlikely(test_bit(0, &adapter->resetting) &&
adapter->reset_reason != VNIC_RESET_NON_FATAL)) {
enable_scrq_irq(adapter, rx_scrq);
napi_complete_done(napi, frames_processed);
return frames_processed;
}
if (!pending_scrq(adapter, rx_scrq))
break;
next = ibmvnic_next_scrq(adapter, rx_scrq);
rx_buff = (struct ibmvnic_rx_buff *)
be64_to_cpu(next->rx_comp.correlator);
/* do error checking */
if (next->rx_comp.rc) {
netdev_dbg(netdev, "rx buffer returned with rc %x\n",
be16_to_cpu(next->rx_comp.rc));
/* free the entry */
next->rx_comp.first = 0;
dev_kfree_skb_any(rx_buff->skb);
remove_buff_from_pool(adapter, rx_buff);
continue;
} else if (!rx_buff->skb) {
/* free the entry */
next->rx_comp.first = 0;
remove_buff_from_pool(adapter, rx_buff);
continue;
}
length = be32_to_cpu(next->rx_comp.len);
offset = be16_to_cpu(next->rx_comp.off_frame_data);
flags = next->rx_comp.flags;
skb = rx_buff->skb;
/* load long_term_buff before copying to skb */
dma_rmb();
skb_copy_to_linear_data(skb, rx_buff->data + offset,
length);
/* VLAN Header has been stripped by the system firmware and
* needs to be inserted by the driver
*/
if (adapter->rx_vlan_header_insertion &&
(flags & IBMVNIC_VLAN_STRIPPED))
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
ntohs(next->rx_comp.vlan_tci));
/* free the entry */
next->rx_comp.first = 0;
remove_buff_from_pool(adapter, rx_buff);
skb_put(skb, length);
skb->protocol = eth_type_trans(skb, netdev);
skb_record_rx_queue(skb, scrq_num);
if (flags & IBMVNIC_IP_CHKSUM_GOOD &&
flags & IBMVNIC_TCP_UDP_CHKSUM_GOOD) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
length = skb->len;
napi_gro_receive(napi, skb); /* send it up */
netdev->stats.rx_packets++;
netdev->stats.rx_bytes += length;
adapter->rx_stats_buffers[scrq_num].packets++;
adapter->rx_stats_buffers[scrq_num].bytes += length;
frames_processed++;
}
if (adapter->state != VNIC_CLOSING &&
((atomic_read(&adapter->rx_pool[scrq_num].available) <
adapter->req_rx_add_entries_per_subcrq / 2) ||
frames_processed < budget))
replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
if (frames_processed < budget) {
if (napi_complete_done(napi, frames_processed)) {
enable_scrq_irq(adapter, rx_scrq);
if (pending_scrq(adapter, rx_scrq)) {
if (napi_reschedule(napi)) {
disable_scrq_irq(adapter, rx_scrq);
goto restart_poll;
}
}
}
}
return frames_processed;
}
static int wait_for_reset(struct ibmvnic_adapter *adapter)
{
int rc, ret;
adapter->fallback.mtu = adapter->req_mtu;
adapter->fallback.rx_queues = adapter->req_rx_queues;
adapter->fallback.tx_queues = adapter->req_tx_queues;
adapter->fallback.rx_entries = adapter->req_rx_add_entries_per_subcrq;
adapter->fallback.tx_entries = adapter->req_tx_entries_per_subcrq;
reinit_completion(&adapter->reset_done);
adapter->wait_for_reset = true;
rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
if (rc) {
ret = rc;
goto out;
}
rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done, 60000);
if (rc) {
ret = -ENODEV;
goto out;
}
ret = 0;
if (adapter->reset_done_rc) {
ret = -EIO;
adapter->desired.mtu = adapter->fallback.mtu;
adapter->desired.rx_queues = adapter->fallback.rx_queues;
adapter->desired.tx_queues = adapter->fallback.tx_queues;
adapter->desired.rx_entries = adapter->fallback.rx_entries;
adapter->desired.tx_entries = adapter->fallback.tx_entries;
reinit_completion(&adapter->reset_done);
adapter->wait_for_reset = true;
rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
if (rc) {
ret = rc;
goto out;
}
rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done,
60000);
if (rc) {
ret = -ENODEV;
goto out;
}
}
out:
adapter->wait_for_reset = false;
return ret;
}
static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
adapter->desired.mtu = new_mtu + ETH_HLEN;
return wait_for_reset(adapter);
}
static netdev_features_t ibmvnic_features_check(struct sk_buff *skb,
struct net_device *dev,
netdev_features_t features)
{
/* Some backing hardware adapters can not
* handle packets with a MSS less than 224
* or with only one segment.
*/
if (skb_is_gso(skb)) {
if (skb_shinfo(skb)->gso_size < 224 ||
skb_shinfo(skb)->gso_segs == 1)
features &= ~NETIF_F_GSO_MASK;
}
return features;
}
static const struct net_device_ops ibmvnic_netdev_ops = {
.ndo_open = ibmvnic_open,
.ndo_stop = ibmvnic_close,
.ndo_start_xmit = ibmvnic_xmit,
.ndo_set_rx_mode = ibmvnic_set_multi,
.ndo_set_mac_address = ibmvnic_set_mac,
.ndo_validate_addr = eth_validate_addr,
.ndo_tx_timeout = ibmvnic_tx_timeout,
.ndo_change_mtu = ibmvnic_change_mtu,
.ndo_features_check = ibmvnic_features_check,
};
/* ethtool functions */
static int ibmvnic_get_link_ksettings(struct net_device *netdev,
struct ethtool_link_ksettings *cmd)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int rc;
rc = send_query_phys_parms(adapter);
if (rc) {
adapter->speed = SPEED_UNKNOWN;
adapter->duplex = DUPLEX_UNKNOWN;
}
cmd->base.speed = adapter->speed;
cmd->base.duplex = adapter->duplex;
cmd->base.port = PORT_FIBRE;
cmd->base.phy_address = 0;
cmd->base.autoneg = AUTONEG_ENABLE;
return 0;
}
static void ibmvnic_get_drvinfo(struct net_device *netdev,
struct ethtool_drvinfo *info)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
strscpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
strscpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
strscpy(info->fw_version, adapter->fw_version,
sizeof(info->fw_version));
}
static u32 ibmvnic_get_msglevel(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
return adapter->msg_enable;
}
static void ibmvnic_set_msglevel(struct net_device *netdev, u32 data)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
adapter->msg_enable = data;
}
static u32 ibmvnic_get_link(struct net_device *netdev)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
/* Don't need to send a query because we request a logical link up at
* init and then we wait for link state indications
*/
return adapter->logical_link_state;
}
static void ibmvnic_get_ringparam(struct net_device *netdev,
struct ethtool_ringparam *ring,
struct kernel_ethtool_ringparam *kernel_ring,
struct netlink_ext_ack *extack)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
ring->rx_max_pending = adapter->max_rx_add_entries_per_subcrq;
ring->tx_max_pending = adapter->max_tx_entries_per_subcrq;
ring->rx_mini_max_pending = 0;
ring->rx_jumbo_max_pending = 0;
ring->rx_pending = adapter->req_rx_add_entries_per_subcrq;
ring->tx_pending = adapter->req_tx_entries_per_subcrq;
ring->rx_mini_pending = 0;
ring->rx_jumbo_pending = 0;
}
static int ibmvnic_set_ringparam(struct net_device *netdev,
struct ethtool_ringparam *ring,
struct kernel_ethtool_ringparam *kernel_ring,
struct netlink_ext_ack *extack)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
if (ring->rx_pending > adapter->max_rx_add_entries_per_subcrq ||
ring->tx_pending > adapter->max_tx_entries_per_subcrq) {
netdev_err(netdev, "Invalid request.\n");
netdev_err(netdev, "Max tx buffers = %llu\n",
adapter->max_rx_add_entries_per_subcrq);
netdev_err(netdev, "Max rx buffers = %llu\n",
adapter->max_tx_entries_per_subcrq);
return -EINVAL;
}
adapter->desired.rx_entries = ring->rx_pending;
adapter->desired.tx_entries = ring->tx_pending;
return wait_for_reset(adapter);
}
static void ibmvnic_get_channels(struct net_device *netdev,
struct ethtool_channels *channels)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
channels->max_rx = adapter->max_rx_queues;
channels->max_tx = adapter->max_tx_queues;
channels->max_other = 0;
channels->max_combined = 0;
channels->rx_count = adapter->req_rx_queues;
channels->tx_count = adapter->req_tx_queues;
channels->other_count = 0;
channels->combined_count = 0;
}
static int ibmvnic_set_channels(struct net_device *netdev,
struct ethtool_channels *channels)
{
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
adapter->desired.rx_queues = channels->rx_count;
adapter->desired.tx_queues = channels->tx_count;
return wait_for_reset(adapter);
}
static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
struct ibmvnic_adapter *adapter = netdev_priv(dev);
int i;
if (stringset != ETH_SS_STATS)
return;
for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++, data += ETH_GSTRING_LEN)
memcpy(data, ibmvnic_stats[i].name, ETH_GSTRING_LEN);
for (i = 0; i < adapter->req_tx_queues; i++) {
snprintf(data, ETH_GSTRING_LEN, "tx%d_packets", i);
data += ETH_GSTRING_LEN;
snprintf(data, ETH_GSTRING_LEN, "tx%d_bytes", i);
data += ETH_GSTRING_LEN;
snprintf(data, ETH_GSTRING_LEN, "tx%d_dropped_packets", i);
data += ETH_GSTRING_LEN;
}
for (i = 0; i < adapter->req_rx_queues; i++) {
snprintf(data, ETH_GSTRING_LEN, "rx%d_packets", i);
data += ETH_GSTRING_LEN;
snprintf(data, ETH_GSTRING_LEN, "rx%d_bytes", i);
data += ETH_GSTRING_LEN;
snprintf(data, ETH_GSTRING_LEN, "rx%d_interrupts", i);
data += ETH_GSTRING_LEN;
}
}
static int ibmvnic_get_sset_count(struct net_device *dev, int sset)
{
struct ibmvnic_adapter *adapter = netdev_priv(dev);
switch (sset) {
case ETH_SS_STATS:
return ARRAY_SIZE(ibmvnic_stats) +
adapter->req_tx_queues * NUM_TX_STATS +
adapter->req_rx_queues * NUM_RX_STATS;
default:
return -EOPNOTSUPP;
}
}
static void ibmvnic_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats, u64 *data)
{
struct ibmvnic_adapter *adapter = netdev_priv(dev);
union ibmvnic_crq crq;
int i, j;
int rc;
memset(&crq, 0, sizeof(crq));
crq.request_statistics.first = IBMVNIC_CRQ_CMD;
crq.request_statistics.cmd = REQUEST_STATISTICS;
crq.request_statistics.ioba = cpu_to_be32(adapter->stats_token);
crq.request_statistics.len =
cpu_to_be32(sizeof(struct ibmvnic_statistics));
/* Wait for data to be written */
reinit_completion(&adapter->stats_done);
rc = ibmvnic_send_crq(adapter, &crq);
if (rc)
return;
rc = ibmvnic_wait_for_completion(adapter, &adapter->stats_done, 10000);
if (rc)
return;
for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
data[i] = be64_to_cpu(IBMVNIC_GET_STAT
(adapter, ibmvnic_stats[i].offset));
for (j = 0; j < adapter->req_tx_queues; j++) {
data[i] = adapter->tx_stats_buffers[j].packets;
i++;
data[i] = adapter->tx_stats_buffers[j].bytes;
i++;
data[i] = adapter->tx_stats_buffers[j].dropped_packets;
i++;
}
for (j = 0; j < adapter->req_rx_queues; j++) {
data[i] = adapter->rx_stats_buffers[j].packets;
i++;
data[i] = adapter->rx_stats_buffers[j].bytes;
i++;
data[i] = adapter->rx_stats_buffers[j].interrupts;
i++;
}
}
static const struct ethtool_ops ibmvnic_ethtool_ops = {
.get_drvinfo = ibmvnic_get_drvinfo,
.get_msglevel = ibmvnic_get_msglevel,
.set_msglevel = ibmvnic_set_msglevel,
.get_link = ibmvnic_get_link,
.get_ringparam = ibmvnic_get_ringparam,
.set_ringparam = ibmvnic_set_ringparam,
.get_channels = ibmvnic_get_channels,
.set_channels = ibmvnic_set_channels,
.get_strings = ibmvnic_get_strings,
.get_sset_count = ibmvnic_get_sset_count,
.get_ethtool_stats = ibmvnic_get_ethtool_stats,
.get_link_ksettings = ibmvnic_get_link_ksettings,
};
/* Routines for managing CRQs/sCRQs */
static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *scrq)
{
int rc;
if (!scrq) {
netdev_dbg(adapter->netdev, "Invalid scrq reset.\n");
return -EINVAL;
}
if (scrq->irq) {
free_irq(scrq->irq, scrq);
irq_dispose_mapping(scrq->irq);
scrq->irq = 0;
}
if (scrq->msgs) {
memset(scrq->msgs, 0, 4 * PAGE_SIZE);
atomic_set(&scrq->used, 0);
scrq->cur = 0;
scrq->ind_buf.index = 0;
} else {
netdev_dbg(adapter->netdev, "Invalid scrq reset\n");
return -EINVAL;
}
rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
return rc;
}
static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter)
{
int i, rc;
if (!adapter->tx_scrq || !adapter->rx_scrq)
return -EINVAL;
for (i = 0; i < adapter->req_tx_queues; i++) {
netdev_dbg(adapter->netdev, "Re-setting tx_scrq[%d]\n", i);
rc = reset_one_sub_crq_queue(adapter, adapter->tx_scrq[i]);
if (rc)
return rc;
}
for (i = 0; i < adapter->req_rx_queues; i++) {
netdev_dbg(adapter->netdev, "Re-setting rx_scrq[%d]\n", i);
rc = reset_one_sub_crq_queue(adapter, adapter->rx_scrq[i]);
if (rc)
return rc;
}
return rc;
}
static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *scrq,
bool do_h_free)
{
struct device *dev = &adapter->vdev->dev;
long rc;
netdev_dbg(adapter->netdev, "Releasing sub-CRQ\n");
if (do_h_free) {
/* Close the sub-crqs */
do {
rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
adapter->vdev->unit_address,
scrq->crq_num);
} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
if (rc) {
netdev_err(adapter->netdev,
"Failed to release sub-CRQ %16lx, rc = %ld\n",
scrq->crq_num, rc);
}
}
dma_free_coherent(dev,
IBMVNIC_IND_ARR_SZ,
scrq->ind_buf.indir_arr,
scrq->ind_buf.indir_dma);
dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
DMA_BIDIRECTIONAL);
free_pages((unsigned long)scrq->msgs, 2);
kfree(scrq);
}
static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
*adapter)
{
struct device *dev = &adapter->vdev->dev;
struct ibmvnic_sub_crq_queue *scrq;
int rc;
scrq = kzalloc(sizeof(*scrq), GFP_KERNEL);
if (!scrq)
return NULL;
scrq->msgs =
(union sub_crq *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 2);
if (!scrq->msgs) {
dev_warn(dev, "Couldn't allocate crq queue messages page\n");
goto zero_page_failed;
}
scrq->msg_token = dma_map_single(dev, scrq->msgs, 4 * PAGE_SIZE,
DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, scrq->msg_token)) {
dev_warn(dev, "Couldn't map crq queue messages page\n");
goto map_failed;
}
rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
if (rc == H_RESOURCE)
rc = ibmvnic_reset_crq(adapter);
if (rc == H_CLOSED) {
dev_warn(dev, "Partner adapter not ready, waiting.\n");
} else if (rc) {
dev_warn(dev, "Error %d registering sub-crq\n", rc);
goto reg_failed;
}
scrq->adapter = adapter;
scrq->size = 4 * PAGE_SIZE / sizeof(*scrq->msgs);
scrq->ind_buf.index = 0;
scrq->ind_buf.indir_arr =
dma_alloc_coherent(dev,
IBMVNIC_IND_ARR_SZ,
&scrq->ind_buf.indir_dma,
GFP_KERNEL);
if (!scrq->ind_buf.indir_arr)
goto indir_failed;
spin_lock_init(&scrq->lock);
netdev_dbg(adapter->netdev,
"sub-crq initialized, num %lx, hw_irq=%lx, irq=%x\n",
scrq->crq_num, scrq->hw_irq, scrq->irq);
return scrq;
indir_failed:
do {
rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
adapter->vdev->unit_address,
scrq->crq_num);
} while (rc == H_BUSY || rc == H_IS_LONG_BUSY(rc));
reg_failed:
dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
DMA_BIDIRECTIONAL);
map_failed:
free_pages((unsigned long)scrq->msgs, 2);
zero_page_failed:
kfree(scrq);
return NULL;
}
static void release_sub_crqs(struct ibmvnic_adapter *adapter, bool do_h_free)
{
int i;
if (adapter->tx_scrq) {
for (i = 0; i < adapter->num_active_tx_scrqs; i++) {
if (!adapter->tx_scrq[i])
continue;
netdev_dbg(adapter->netdev, "Releasing tx_scrq[%d]\n",
i);
ibmvnic_tx_scrq_clean_buffer(adapter, adapter->tx_scrq[i]);
if (adapter->tx_scrq[i]->irq) {
free_irq(adapter->tx_scrq[i]->irq,
adapter->tx_scrq[i]);
irq_dispose_mapping(adapter->tx_scrq[i]->irq);
adapter->tx_scrq[i]->irq = 0;
}
release_sub_crq_queue(adapter, adapter->tx_scrq[i],
do_h_free);
}
kfree(adapter->tx_scrq);
adapter->tx_scrq = NULL;
adapter->num_active_tx_scrqs = 0;
}
if (adapter->rx_scrq) {
for (i = 0; i < adapter->num_active_rx_scrqs; i++) {
if (!adapter->rx_scrq[i])
continue;
netdev_dbg(adapter->netdev, "Releasing rx_scrq[%d]\n",
i);
if (adapter->rx_scrq[i]->irq) {
free_irq(adapter->rx_scrq[i]->irq,
adapter->rx_scrq[i]);
irq_dispose_mapping(adapter->rx_scrq[i]->irq);
adapter->rx_scrq[i]->irq = 0;
}
release_sub_crq_queue(adapter, adapter->rx_scrq[i],
do_h_free);
}
kfree(adapter->rx_scrq);
adapter->rx_scrq = NULL;
adapter->num_active_rx_scrqs = 0;
}
}
static int disable_scrq_irq(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *scrq)
{
struct device *dev = &adapter->vdev->dev;
unsigned long rc;
rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
H_DISABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
if (rc)
dev_err(dev, "Couldn't disable scrq irq 0x%lx. rc=%ld\n",
scrq->hw_irq, rc);
return rc;
}
/* We can not use the IRQ chip EOI handler because that has the
* unintended effect of changing the interrupt priority.
*/
static void ibmvnic_xics_eoi(struct device *dev, struct ibmvnic_sub_crq_queue *scrq)
{
u64 val = 0xff000000 | scrq->hw_irq;
unsigned long rc;
rc = plpar_hcall_norets(H_EOI, val);
if (rc)
dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n", val, rc);
}
/* Due to a firmware bug, the hypervisor can send an interrupt to a
* transmit or receive queue just prior to a partition migration.
* Force an EOI after migration.
*/
static void ibmvnic_clear_pending_interrupt(struct device *dev,
struct ibmvnic_sub_crq_queue *scrq)
{
if (!xive_enabled())
ibmvnic_xics_eoi(dev, scrq);
}
static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *scrq)
{
struct device *dev = &adapter->vdev->dev;
unsigned long rc;
if (scrq->hw_irq > 0x100000000ULL) {
dev_err(dev, "bad hw_irq = %lx\n", scrq->hw_irq);
return 1;
}
if (test_bit(0, &adapter->resetting) &&
adapter->reset_reason == VNIC_RESET_MOBILITY) {
ibmvnic_clear_pending_interrupt(dev, scrq);
}
rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
H_ENABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
if (rc)
dev_err(dev, "Couldn't enable scrq irq 0x%lx. rc=%ld\n",
scrq->hw_irq, rc);
return rc;
}
static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *scrq)
{
struct device *dev = &adapter->vdev->dev;
struct ibmvnic_tx_pool *tx_pool;
struct ibmvnic_tx_buff *txbuff;
struct netdev_queue *txq;
union sub_crq *next;
int index;
int i;
restart_loop:
while (pending_scrq(adapter, scrq)) {
unsigned int pool = scrq->pool_index;
int num_entries = 0;
int total_bytes = 0;
int num_packets = 0;
next = ibmvnic_next_scrq(adapter, scrq);
for (i = 0; i < next->tx_comp.num_comps; i++) {
index = be32_to_cpu(next->tx_comp.correlators[i]);
if (index & IBMVNIC_TSO_POOL_MASK) {
tx_pool = &adapter->tso_pool[pool];
index &= ~IBMVNIC_TSO_POOL_MASK;
} else {
tx_pool = &adapter->tx_pool[pool];
}
txbuff = &tx_pool->tx_buff[index];
num_packets++;
num_entries += txbuff->num_entries;
if (txbuff->skb) {
total_bytes += txbuff->skb->len;
if (next->tx_comp.rcs[i]) {
dev_err(dev, "tx error %x\n",
next->tx_comp.rcs[i]);
dev_kfree_skb_irq(txbuff->skb);
} else {
dev_consume_skb_irq(txbuff->skb);
}
txbuff->skb = NULL;
} else {
netdev_warn(adapter->netdev,
"TX completion received with NULL socket buffer\n");
}
tx_pool->free_map[tx_pool->producer_index] = index;
tx_pool->producer_index =
(tx_pool->producer_index + 1) %
tx_pool->num_buffers;
}
/* remove tx_comp scrq*/
next->tx_comp.first = 0;
txq = netdev_get_tx_queue(adapter->netdev, scrq->pool_index);
netdev_tx_completed_queue(txq, num_packets, total_bytes);
if (atomic_sub_return(num_entries, &scrq->used) <=
(adapter->req_tx_entries_per_subcrq / 2) &&
__netif_subqueue_stopped(adapter->netdev,
scrq->pool_index)) {
rcu_read_lock();
if (adapter->tx_queues_active) {
netif_wake_subqueue(adapter->netdev,
scrq->pool_index);
netdev_dbg(adapter->netdev,
"Started queue %d\n",
scrq->pool_index);
}
rcu_read_unlock();
}
}
enable_scrq_irq(adapter, scrq);
if (pending_scrq(adapter, scrq)) {
disable_scrq_irq(adapter, scrq);
goto restart_loop;
}
return 0;
}
static irqreturn_t ibmvnic_interrupt_tx(int irq, void *instance)
{
struct ibmvnic_sub_crq_queue *scrq = instance;
struct ibmvnic_adapter *adapter = scrq->adapter;
disable_scrq_irq(adapter, scrq);
ibmvnic_complete_tx(adapter, scrq);
return IRQ_HANDLED;
}
static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance)
{
struct ibmvnic_sub_crq_queue *scrq = instance;
struct ibmvnic_adapter *adapter = scrq->adapter;
/* When booting a kdump kernel we can hit pending interrupts
* prior to completing driver initialization.
*/
if (unlikely(adapter->state != VNIC_OPEN))
return IRQ_NONE;
adapter->rx_stats_buffers[scrq->scrq_num].interrupts++;
if (napi_schedule_prep(&adapter->napi[scrq->scrq_num])) {
disable_scrq_irq(adapter, scrq);
__napi_schedule(&adapter->napi[scrq->scrq_num]);
}
return IRQ_HANDLED;
}
static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
struct ibmvnic_sub_crq_queue *scrq;
int i = 0, j = 0;
int rc = 0;
for (i = 0; i < adapter->req_tx_queues; i++) {
netdev_dbg(adapter->netdev, "Initializing tx_scrq[%d] irq\n",
i);
scrq = adapter->tx_scrq[i];
scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
if (!scrq->irq) {
rc = -EINVAL;
dev_err(dev, "Error mapping irq\n");
goto req_tx_irq_failed;
}
snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-tx%d",
adapter->vdev->unit_address, i);
rc = request_irq(scrq->irq, ibmvnic_interrupt_tx,
0, scrq->name, scrq);
if (rc) {
dev_err(dev, "Couldn't register tx irq 0x%x. rc=%d\n",
scrq->irq, rc);
irq_dispose_mapping(scrq->irq);
goto req_tx_irq_failed;
}
}
for (i = 0; i < adapter->req_rx_queues; i++) {
netdev_dbg(adapter->netdev, "Initializing rx_scrq[%d] irq\n",
i);
scrq = adapter->rx_scrq[i];
scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
if (!scrq->irq) {
rc = -EINVAL;
dev_err(dev, "Error mapping irq\n");
goto req_rx_irq_failed;
}
snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-rx%d",
adapter->vdev->unit_address, i);
rc = request_irq(scrq->irq, ibmvnic_interrupt_rx,
0, scrq->name, scrq);
if (rc) {
dev_err(dev, "Couldn't register rx irq 0x%x. rc=%d\n",
scrq->irq, rc);
irq_dispose_mapping(scrq->irq);
goto req_rx_irq_failed;
}
}
return rc;
req_rx_irq_failed:
for (j = 0; j < i; j++) {
free_irq(adapter->rx_scrq[j]->irq, adapter->rx_scrq[j]);
irq_dispose_mapping(adapter->rx_scrq[j]->irq);
}
i = adapter->req_tx_queues;
req_tx_irq_failed:
for (j = 0; j < i; j++) {
free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]);
irq_dispose_mapping(adapter->tx_scrq[j]->irq);
}
release_sub_crqs(adapter, 1);
return rc;
}
static int init_sub_crqs(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
struct ibmvnic_sub_crq_queue **allqueues;
int registered_queues = 0;
int total_queues;
int more = 0;
int i;
total_queues = adapter->req_tx_queues + adapter->req_rx_queues;
allqueues = kcalloc(total_queues, sizeof(*allqueues), GFP_KERNEL);
if (!allqueues)
return -ENOMEM;
for (i = 0; i < total_queues; i++) {
allqueues[i] = init_sub_crq_queue(adapter);
if (!allqueues[i]) {
dev_warn(dev, "Couldn't allocate all sub-crqs\n");
break;
}
registered_queues++;
}
/* Make sure we were able to register the minimum number of queues */
if (registered_queues <
adapter->min_tx_queues + adapter->min_rx_queues) {
dev_err(dev, "Fatal: Couldn't init min number of sub-crqs\n");
goto tx_failed;
}
/* Distribute the failed allocated queues*/
for (i = 0; i < total_queues - registered_queues + more ; i++) {
netdev_dbg(adapter->netdev, "Reducing number of queues\n");
switch (i % 3) {
case 0:
if (adapter->req_rx_queues > adapter->min_rx_queues)
adapter->req_rx_queues--;
else
more++;
break;
case 1:
if (adapter->req_tx_queues > adapter->min_tx_queues)
adapter->req_tx_queues--;
else
more++;
break;
}
}
adapter->tx_scrq = kcalloc(adapter->req_tx_queues,
sizeof(*adapter->tx_scrq), GFP_KERNEL);
if (!adapter->tx_scrq)
goto tx_failed;
for (i = 0; i < adapter->req_tx_queues; i++) {
adapter->tx_scrq[i] = allqueues[i];
adapter->tx_scrq[i]->pool_index = i;
adapter->num_active_tx_scrqs++;
}
adapter->rx_scrq = kcalloc(adapter->req_rx_queues,
sizeof(*adapter->rx_scrq), GFP_KERNEL);
if (!adapter->rx_scrq)
goto rx_failed;
for (i = 0; i < adapter->req_rx_queues; i++) {
adapter->rx_scrq[i] = allqueues[i + adapter->req_tx_queues];
adapter->rx_scrq[i]->scrq_num = i;
adapter->num_active_rx_scrqs++;
}
kfree(allqueues);
return 0;
rx_failed:
kfree(adapter->tx_scrq);
adapter->tx_scrq = NULL;
tx_failed:
for (i = 0; i < registered_queues; i++)
release_sub_crq_queue(adapter, allqueues[i], 1);
kfree(allqueues);
return -ENOMEM;
}
static void send_request_cap(struct ibmvnic_adapter *adapter, int retry)
{
struct device *dev = &adapter->vdev->dev;
union ibmvnic_crq crq;
int max_entries;
int cap_reqs;
/* We send out 6 or 7 REQUEST_CAPABILITY CRQs below (depending on
* the PROMISC flag). Initialize this count upfront. When the tasklet
* receives a response to all of these, it will send the next protocol
* message (QUERY_IP_OFFLOAD).
*/
if (!(adapter->netdev->flags & IFF_PROMISC) ||
adapter->promisc_supported)
cap_reqs = 7;
else
cap_reqs = 6;
if (!retry) {
/* Sub-CRQ entries are 32 byte long */
int entries_page = 4 * PAGE_SIZE / (sizeof(u64) * 4);
atomic_set(&adapter->running_cap_crqs, cap_reqs);
if (adapter->min_tx_entries_per_subcrq > entries_page ||
adapter->min_rx_add_entries_per_subcrq > entries_page) {
dev_err(dev, "Fatal, invalid entries per sub-crq\n");
return;
}
if (adapter->desired.mtu)
adapter->req_mtu = adapter->desired.mtu;
else
adapter->req_mtu = adapter->netdev->mtu + ETH_HLEN;
if (!adapter->desired.tx_entries)
adapter->desired.tx_entries =
adapter->max_tx_entries_per_subcrq;
if (!adapter->desired.rx_entries)
adapter->desired.rx_entries =
adapter->max_rx_add_entries_per_subcrq;
max_entries = IBMVNIC_LTB_SET_SIZE /
(adapter->req_mtu + IBMVNIC_BUFFER_HLEN);
if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
adapter->desired.tx_entries > IBMVNIC_LTB_SET_SIZE) {
adapter->desired.tx_entries = max_entries;
}
if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
adapter->desired.rx_entries > IBMVNIC_LTB_SET_SIZE) {
adapter->desired.rx_entries = max_entries;
}
if (adapter->desired.tx_entries)
adapter->req_tx_entries_per_subcrq =
adapter->desired.tx_entries;
else
adapter->req_tx_entries_per_subcrq =
adapter->max_tx_entries_per_subcrq;
if (adapter->desired.rx_entries)
adapter->req_rx_add_entries_per_subcrq =
adapter->desired.rx_entries;
else
adapter->req_rx_add_entries_per_subcrq =
adapter->max_rx_add_entries_per_subcrq;
if (adapter->desired.tx_queues)
adapter->req_tx_queues =
adapter->desired.tx_queues;
else
adapter->req_tx_queues =
adapter->opt_tx_comp_sub_queues;
if (adapter->desired.rx_queues)
adapter->req_rx_queues =
adapter->desired.rx_queues;
else
adapter->req_rx_queues =
adapter->opt_rx_comp_queues;
adapter->req_rx_add_queues = adapter->max_rx_add_queues;
} else {
atomic_add(cap_reqs, &adapter->running_cap_crqs);
}
memset(&crq, 0, sizeof(crq));
crq.request_capability.first = IBMVNIC_CRQ_CMD;
crq.request_capability.cmd = REQUEST_CAPABILITY;
crq.request_capability.capability = cpu_to_be16(REQ_TX_QUEUES);
crq.request_capability.number = cpu_to_be64(adapter->req_tx_queues);
cap_reqs--;
ibmvnic_send_crq(adapter, &crq);
crq.request_capability.capability = cpu_to_be16(REQ_RX_QUEUES);
crq.request_capability.number = cpu_to_be64(adapter->req_rx_queues);
cap_reqs--;
ibmvnic_send_crq(adapter, &crq);
crq.request_capability.capability = cpu_to_be16(REQ_RX_ADD_QUEUES);
crq.request_capability.number = cpu_to_be64(adapter->req_rx_add_queues);
cap_reqs--;
ibmvnic_send_crq(adapter, &crq);
crq.request_capability.capability =
cpu_to_be16(REQ_TX_ENTRIES_PER_SUBCRQ);
crq.request_capability.number =
cpu_to_be64(adapter->req_tx_entries_per_subcrq);
cap_reqs--;
ibmvnic_send_crq(adapter, &crq);
crq.request_capability.capability =
cpu_to_be16(REQ_RX_ADD_ENTRIES_PER_SUBCRQ);
crq.request_capability.number =
cpu_to_be64(adapter->req_rx_add_entries_per_subcrq);
cap_reqs--;
ibmvnic_send_crq(adapter, &crq);
crq.request_capability.capability = cpu_to_be16(REQ_MTU);
crq.request_capability.number = cpu_to_be64(adapter->req_mtu);
cap_reqs--;
ibmvnic_send_crq(adapter, &crq);
if (adapter->netdev->flags & IFF_PROMISC) {
if (adapter->promisc_supported) {
crq.request_capability.capability =
cpu_to_be16(PROMISC_REQUESTED);
crq.request_capability.number = cpu_to_be64(1);
cap_reqs--;
ibmvnic_send_crq(adapter, &crq);
}
} else {
crq.request_capability.capability =
cpu_to_be16(PROMISC_REQUESTED);
crq.request_capability.number = cpu_to_be64(0);
cap_reqs--;
ibmvnic_send_crq(adapter, &crq);
}
/* Keep at end to catch any discrepancy between expected and actual
* CRQs sent.
*/
WARN_ON(cap_reqs != 0);
}
static int pending_scrq(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *scrq)
{
union sub_crq *entry = &scrq->msgs[scrq->cur];
int rc;
rc = !!(entry->generic.first & IBMVNIC_CRQ_CMD_RSP);
/* Ensure that the SCRQ valid flag is loaded prior to loading the
* contents of the SCRQ descriptor
*/
dma_rmb();
return rc;
}
static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *scrq)
{
union sub_crq *entry;
unsigned long flags;
spin_lock_irqsave(&scrq->lock, flags);
entry = &scrq->msgs[scrq->cur];
if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP) {
if (++scrq->cur == scrq->size)
scrq->cur = 0;
} else {
entry = NULL;
}
spin_unlock_irqrestore(&scrq->lock, flags);
/* Ensure that the SCRQ valid flag is loaded prior to loading the
* contents of the SCRQ descriptor
*/
dma_rmb();
return entry;
}
static union ibmvnic_crq *ibmvnic_next_crq(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_crq_queue *queue = &adapter->crq;
union ibmvnic_crq *crq;
crq = &queue->msgs[queue->cur];
if (crq->generic.first & IBMVNIC_CRQ_CMD_RSP) {
if (++queue->cur == queue->size)
queue->cur = 0;
} else {
crq = NULL;
}
return crq;
}
static void print_subcrq_error(struct device *dev, int rc, const char *func)
{
switch (rc) {
case H_PARAMETER:
dev_warn_ratelimited(dev,
"%s failed: Send request is malformed or adapter failover pending. (rc=%d)\n",
func, rc);
break;
case H_CLOSED:
dev_warn_ratelimited(dev,
"%s failed: Backing queue closed. Adapter is down or failover pending. (rc=%d)\n",
func, rc);
break;
default:
dev_err_ratelimited(dev, "%s failed: (rc=%d)\n", func, rc);
break;
}
}
static int send_subcrq_indirect(struct ibmvnic_adapter *adapter,
u64 remote_handle, u64 ioba, u64 num_entries)
{
unsigned int ua = adapter->vdev->unit_address;
struct device *dev = &adapter->vdev->dev;
int rc;
/* Make sure the hypervisor sees the complete request */
dma_wmb();
rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua,
cpu_to_be64(remote_handle),
ioba, num_entries);
if (rc)
print_subcrq_error(dev, rc, __func__);
return rc;
}
static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
union ibmvnic_crq *crq)
{
unsigned int ua = adapter->vdev->unit_address;
struct device *dev = &adapter->vdev->dev;
u64 *u64_crq = (u64 *)crq;
int rc;
netdev_dbg(adapter->netdev, "Sending CRQ: %016lx %016lx\n",
(unsigned long)cpu_to_be64(u64_crq[0]),
(unsigned long)cpu_to_be64(u64_crq[1]));
if (!adapter->crq.active &&
crq->generic.first != IBMVNIC_CRQ_INIT_CMD) {
dev_warn(dev, "Invalid request detected while CRQ is inactive, possible device state change during reset\n");
return -EINVAL;
}
/* Make sure the hypervisor sees the complete request */
dma_wmb();
rc = plpar_hcall_norets(H_SEND_CRQ, ua,
cpu_to_be64(u64_crq[0]),
cpu_to_be64(u64_crq[1]));
if (rc) {
if (rc == H_CLOSED) {
dev_warn(dev, "CRQ Queue closed\n");
/* do not reset, report the fail, wait for passive init from server */
}
dev_warn(dev, "Send error (rc=%d)\n", rc);
}
return rc;
}
static int ibmvnic_send_crq_init(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
union ibmvnic_crq crq;
int retries = 100;
int rc;
memset(&crq, 0, sizeof(crq));
crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
crq.generic.cmd = IBMVNIC_CRQ_INIT;
netdev_dbg(adapter->netdev, "Sending CRQ init\n");
do {
rc = ibmvnic_send_crq(adapter, &crq);
if (rc != H_CLOSED)
break;
retries--;
msleep(50);
} while (retries > 0);
if (rc) {
dev_err(dev, "Failed to send init request, rc = %d\n", rc);
return rc;
}
return 0;
}
struct vnic_login_client_data {
u8 type;
__be16 len;
char name[];
} __packed;
static int vnic_client_data_len(struct ibmvnic_adapter *adapter)
{
int len;
/* Calculate the amount of buffer space needed for the
* vnic client data in the login buffer. There are four entries,
* OS name, LPAR name, device name, and a null last entry.
*/
len = 4 * sizeof(struct vnic_login_client_data);
len += 6; /* "Linux" plus NULL */
len += strlen(utsname()->nodename) + 1;
len += strlen(adapter->netdev->name) + 1;
return len;
}
static void vnic_add_client_data(struct ibmvnic_adapter *adapter,
struct vnic_login_client_data *vlcd)
{
const char *os_name = "Linux";
int len;
/* Type 1 - LPAR OS */
vlcd->type = 1;
len = strlen(os_name) + 1;
vlcd->len = cpu_to_be16(len);
strscpy(vlcd->name, os_name, len);
vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
/* Type 2 - LPAR name */
vlcd->type = 2;
len = strlen(utsname()->nodename) + 1;
vlcd->len = cpu_to_be16(len);
strscpy(vlcd->name, utsname()->nodename, len);
vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
/* Type 3 - device name */
vlcd->type = 3;
len = strlen(adapter->netdev->name) + 1;
vlcd->len = cpu_to_be16(len);
strscpy(vlcd->name, adapter->netdev->name, len);
}
static int send_login(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_login_rsp_buffer *login_rsp_buffer;
struct ibmvnic_login_buffer *login_buffer;
struct device *dev = &adapter->vdev->dev;
struct vnic_login_client_data *vlcd;
dma_addr_t rsp_buffer_token;
dma_addr_t buffer_token;
size_t rsp_buffer_size;
union ibmvnic_crq crq;
int client_data_len;
size_t buffer_size;
__be64 *tx_list_p;
__be64 *rx_list_p;
int rc;
int i;
if (!adapter->tx_scrq || !adapter->rx_scrq) {
netdev_err(adapter->netdev,
"RX or TX queues are not allocated, device login failed\n");
return -ENOMEM;
}
release_login_buffer(adapter);
release_login_rsp_buffer(adapter);
client_data_len = vnic_client_data_len(adapter);
buffer_size =
sizeof(struct ibmvnic_login_buffer) +
sizeof(u64) * (adapter->req_tx_queues + adapter->req_rx_queues) +
client_data_len;
login_buffer = kzalloc(buffer_size, GFP_ATOMIC);
if (!login_buffer)
goto buf_alloc_failed;
buffer_token = dma_map_single(dev, login_buffer, buffer_size,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, buffer_token)) {
dev_err(dev, "Couldn't map login buffer\n");
goto buf_map_failed;
}
rsp_buffer_size = sizeof(struct ibmvnic_login_rsp_buffer) +
sizeof(u64) * adapter->req_tx_queues +
sizeof(u64) * adapter->req_rx_queues +
sizeof(u64) * adapter->req_rx_queues +
sizeof(u8) * IBMVNIC_TX_DESC_VERSIONS;
login_rsp_buffer = kmalloc(rsp_buffer_size, GFP_ATOMIC);
if (!login_rsp_buffer)
goto buf_rsp_alloc_failed;
rsp_buffer_token = dma_map_single(dev, login_rsp_buffer,
rsp_buffer_size, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, rsp_buffer_token)) {
dev_err(dev, "Couldn't map login rsp buffer\n");
goto buf_rsp_map_failed;
}
adapter->login_buf = login_buffer;
adapter->login_buf_token = buffer_token;
adapter->login_buf_sz = buffer_size;
adapter->login_rsp_buf = login_rsp_buffer;
adapter->login_rsp_buf_token = rsp_buffer_token;
adapter->login_rsp_buf_sz = rsp_buffer_size;
login_buffer->len = cpu_to_be32(buffer_size);
login_buffer->version = cpu_to_be32(INITIAL_VERSION_LB);
login_buffer->num_txcomp_subcrqs = cpu_to_be32(adapter->req_tx_queues);
login_buffer->off_txcomp_subcrqs =
cpu_to_be32(sizeof(struct ibmvnic_login_buffer));
login_buffer->num_rxcomp_subcrqs = cpu_to_be32(adapter->req_rx_queues);
login_buffer->off_rxcomp_subcrqs =
cpu_to_be32(sizeof(struct ibmvnic_login_buffer) +
sizeof(u64) * adapter->req_tx_queues);
login_buffer->login_rsp_ioba = cpu_to_be32(rsp_buffer_token);
login_buffer->login_rsp_len = cpu_to_be32(rsp_buffer_size);
tx_list_p = (__be64 *)((char *)login_buffer +
sizeof(struct ibmvnic_login_buffer));
rx_list_p = (__be64 *)((char *)login_buffer +
sizeof(struct ibmvnic_login_buffer) +
sizeof(u64) * adapter->req_tx_queues);
for (i = 0; i < adapter->req_tx_queues; i++) {
if (adapter->tx_scrq[i]) {
tx_list_p[i] =
cpu_to_be64(adapter->tx_scrq[i]->crq_num);
}
}
for (i = 0; i < adapter->req_rx_queues; i++) {
if (adapter->rx_scrq[i]) {
rx_list_p[i] =
cpu_to_be64(adapter->rx_scrq[i]->crq_num);
}
}
/* Insert vNIC login client data */
vlcd = (struct vnic_login_client_data *)
((char *)rx_list_p + (sizeof(u64) * adapter->req_rx_queues));
login_buffer->client_data_offset =
cpu_to_be32((char *)vlcd - (char *)login_buffer);
login_buffer->client_data_len = cpu_to_be32(client_data_len);
vnic_add_client_data(adapter, vlcd);
netdev_dbg(adapter->netdev, "Login Buffer:\n");
for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) {
netdev_dbg(adapter->netdev, "%016lx\n",
((unsigned long *)(adapter->login_buf))[i]);
}
memset(&crq, 0, sizeof(crq));
crq.login.first = IBMVNIC_CRQ_CMD;
crq.login.cmd = LOGIN;
crq.login.ioba = cpu_to_be32(buffer_token);
crq.login.len = cpu_to_be32(buffer_size);
adapter->login_pending = true;
rc = ibmvnic_send_crq(adapter, &crq);
if (rc) {
adapter->login_pending = false;
netdev_err(adapter->netdev, "Failed to send login, rc=%d\n", rc);
goto buf_rsp_map_failed;
}
return 0;
buf_rsp_map_failed:
kfree(login_rsp_buffer);
adapter->login_rsp_buf = NULL;
buf_rsp_alloc_failed:
dma_unmap_single(dev, buffer_token, buffer_size, DMA_TO_DEVICE);
buf_map_failed:
kfree(login_buffer);
adapter->login_buf = NULL;
buf_alloc_failed:
return -ENOMEM;
}
static int send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,
u32 len, u8 map_id)
{
union ibmvnic_crq crq;
memset(&crq, 0, sizeof(crq));
crq.request_map.first = IBMVNIC_CRQ_CMD;
crq.request_map.cmd = REQUEST_MAP;
crq.request_map.map_id = map_id;
crq.request_map.ioba = cpu_to_be32(addr);
crq.request_map.len = cpu_to_be32(len);
return ibmvnic_send_crq(adapter, &crq);
}
static int send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id)
{
union ibmvnic_crq crq;
memset(&crq, 0, sizeof(crq));
crq.request_unmap.first = IBMVNIC_CRQ_CMD;
crq.request_unmap.cmd = REQUEST_UNMAP;
crq.request_unmap.map_id = map_id;
return ibmvnic_send_crq(adapter, &crq);
}
static void send_query_map(struct ibmvnic_adapter *adapter)
{
union ibmvnic_crq crq;
memset(&crq, 0, sizeof(crq));
crq.query_map.first = IBMVNIC_CRQ_CMD;
crq.query_map.cmd = QUERY_MAP;
ibmvnic_send_crq(adapter, &crq);
}
/* Send a series of CRQs requesting various capabilities of the VNIC server */
static void send_query_cap(struct ibmvnic_adapter *adapter)
{
union ibmvnic_crq crq;
int cap_reqs;
/* We send out 25 QUERY_CAPABILITY CRQs below. Initialize this count
* upfront. When the tasklet receives a response to all of these, it
* can send out the next protocol messaage (REQUEST_CAPABILITY).
*/
cap_reqs = 25;
atomic_set(&adapter->running_cap_crqs, cap_reqs);
memset(&crq, 0, sizeof(crq));
crq.query_capability.first = IBMVNIC_CRQ_CMD;
crq.query_capability.cmd = QUERY_CAPABILITY;
crq.query_capability.capability = cpu_to_be16(MIN_TX_QUEUES);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(MIN_RX_QUEUES);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(MIN_RX_ADD_QUEUES);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(MAX_TX_QUEUES);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(MAX_RX_QUEUES);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(MAX_RX_ADD_QUEUES);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability =
cpu_to_be16(MIN_TX_ENTRIES_PER_SUBCRQ);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability =
cpu_to_be16(MIN_RX_ADD_ENTRIES_PER_SUBCRQ);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability =
cpu_to_be16(MAX_TX_ENTRIES_PER_SUBCRQ);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability =
cpu_to_be16(MAX_RX_ADD_ENTRIES_PER_SUBCRQ);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(TCP_IP_OFFLOAD);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(PROMISC_SUPPORTED);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(MIN_MTU);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(MAX_MTU);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(MAX_MULTICAST_FILTERS);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(VLAN_HEADER_INSERTION);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(RX_VLAN_HEADER_INSERTION);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(MAX_TX_SG_ENTRIES);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(RX_SG_SUPPORTED);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(OPT_TX_COMP_SUB_QUEUES);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(OPT_RX_COMP_QUEUES);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability =
cpu_to_be16(OPT_RX_BUFADD_Q_PER_RX_COMP_Q);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability =
cpu_to_be16(OPT_TX_ENTRIES_PER_SUBCRQ);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability =
cpu_to_be16(OPT_RXBA_ENTRIES_PER_SUBCRQ);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
crq.query_capability.capability = cpu_to_be16(TX_RX_DESC_REQ);
ibmvnic_send_crq(adapter, &crq);
cap_reqs--;
/* Keep at end to catch any discrepancy between expected and actual
* CRQs sent.
*/
WARN_ON(cap_reqs != 0);
}
static void send_query_ip_offload(struct ibmvnic_adapter *adapter)
{
int buf_sz = sizeof(struct ibmvnic_query_ip_offload_buffer);
struct device *dev = &adapter->vdev->dev;
union ibmvnic_crq crq;
adapter->ip_offload_tok =
dma_map_single(dev,
&adapter->ip_offload_buf,
buf_sz,
DMA_FROM_DEVICE);
if (dma_mapping_error(dev, adapter->ip_offload_tok)) {
if (!firmware_has_feature(FW_FEATURE_CMO))
dev_err(dev, "Couldn't map offload buffer\n");
return;
}
memset(&crq, 0, sizeof(crq));
crq.query_ip_offload.first = IBMVNIC_CRQ_CMD;
crq.query_ip_offload.cmd = QUERY_IP_OFFLOAD;
crq.query_ip_offload.len = cpu_to_be32(buf_sz);
crq.query_ip_offload.ioba =
cpu_to_be32(adapter->ip_offload_tok);
ibmvnic_send_crq(adapter, &crq);
}
static void send_control_ip_offload(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_control_ip_offload_buffer *ctrl_buf = &adapter->ip_offload_ctrl;
struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
struct device *dev = &adapter->vdev->dev;
netdev_features_t old_hw_features = 0;
union ibmvnic_crq crq;
adapter->ip_offload_ctrl_tok =
dma_map_single(dev,
ctrl_buf,
sizeof(adapter->ip_offload_ctrl),
DMA_TO_DEVICE);
if (dma_mapping_error(dev, adapter->ip_offload_ctrl_tok)) {
dev_err(dev, "Couldn't map ip offload control buffer\n");
return;
}
ctrl_buf->len = cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
ctrl_buf->version = cpu_to_be32(INITIAL_VERSION_IOB);
ctrl_buf->ipv4_chksum = buf->ipv4_chksum;
ctrl_buf->ipv6_chksum = buf->ipv6_chksum;
ctrl_buf->tcp_ipv4_chksum = buf->tcp_ipv4_chksum;
ctrl_buf->udp_ipv4_chksum = buf->udp_ipv4_chksum;
ctrl_buf->tcp_ipv6_chksum = buf->tcp_ipv6_chksum;
ctrl_buf->udp_ipv6_chksum = buf->udp_ipv6_chksum;
ctrl_buf->large_tx_ipv4 = buf->large_tx_ipv4;
ctrl_buf->large_tx_ipv6 = buf->large_tx_ipv6;
/* large_rx disabled for now, additional features needed */
ctrl_buf->large_rx_ipv4 = 0;
ctrl_buf->large_rx_ipv6 = 0;
if (adapter->state != VNIC_PROBING) {
old_hw_features = adapter->netdev->hw_features;
adapter->netdev->hw_features = 0;
}
adapter->netdev->hw_features = NETIF_F_SG | NETIF_F_GSO | NETIF_F_GRO;
if (buf->tcp_ipv4_chksum || buf->udp_ipv4_chksum)
adapter->netdev->hw_features |= NETIF_F_IP_CSUM;
if (buf->tcp_ipv6_chksum || buf->udp_ipv6_chksum)
adapter->netdev->hw_features |= NETIF_F_IPV6_CSUM;
if ((adapter->netdev->features &
(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
adapter->netdev->hw_features |= NETIF_F_RXCSUM;
if (buf->large_tx_ipv4)
adapter->netdev->hw_features |= NETIF_F_TSO;
if (buf->large_tx_ipv6)
adapter->netdev->hw_features |= NETIF_F_TSO6;
if (adapter->state == VNIC_PROBING) {
adapter->netdev->features |= adapter->netdev->hw_features;
} else if (old_hw_features != adapter->netdev->hw_features) {
netdev_features_t tmp = 0;
/* disable features no longer supported */
adapter->netdev->features &= adapter->netdev->hw_features;
/* turn on features now supported if previously enabled */
tmp = (old_hw_features ^ adapter->netdev->hw_features) &
adapter->netdev->hw_features;
adapter->netdev->features |=
tmp & adapter->netdev->wanted_features;
}
memset(&crq, 0, sizeof(crq));
crq.control_ip_offload.first = IBMVNIC_CRQ_CMD;
crq.control_ip_offload.cmd = CONTROL_IP_OFFLOAD;
crq.control_ip_offload.len =
cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
crq.control_ip_offload.ioba = cpu_to_be32(adapter->ip_offload_ctrl_tok);
ibmvnic_send_crq(adapter, &crq);
}
static void handle_vpd_size_rsp(union ibmvnic_crq *crq,
struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
if (crq->get_vpd_size_rsp.rc.code) {
dev_err(dev, "Error retrieving VPD size, rc=%x\n",
crq->get_vpd_size_rsp.rc.code);
complete(&adapter->fw_done);
return;
}
adapter->vpd->len = be64_to_cpu(crq->get_vpd_size_rsp.len);
complete(&adapter->fw_done);
}
static void handle_vpd_rsp(union ibmvnic_crq *crq,
struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
unsigned char *substr = NULL;
u8 fw_level_len = 0;
memset(adapter->fw_version, 0, 32);
dma_unmap_single(dev, adapter->vpd->dma_addr, adapter->vpd->len,
DMA_FROM_DEVICE);
if (crq->get_vpd_rsp.rc.code) {
dev_err(dev, "Error retrieving VPD from device, rc=%x\n",
crq->get_vpd_rsp.rc.code);
goto complete;
}
/* get the position of the firmware version info
* located after the ASCII 'RM' substring in the buffer
*/
substr = strnstr(adapter->vpd->buff, "RM", adapter->vpd->len);
if (!substr) {
dev_info(dev, "Warning - No FW level has been provided in the VPD buffer by the VIOS Server\n");
goto complete;
}
/* get length of firmware level ASCII substring */
if ((substr + 2) < (adapter->vpd->buff + adapter->vpd->len)) {
fw_level_len = *(substr + 2);
} else {
dev_info(dev, "Length of FW substr extrapolated VDP buff\n");
goto complete;
}
/* copy firmware version string from vpd into adapter */
if ((substr + 3 + fw_level_len) <
(adapter->vpd->buff + adapter->vpd->len)) {
strncpy((char *)adapter->fw_version, substr + 3, fw_level_len);
} else {
dev_info(dev, "FW substr extrapolated VPD buff\n");
}
complete:
if (adapter->fw_version[0] == '\0')
strscpy((char *)adapter->fw_version, "N/A", sizeof(adapter->fw_version));
complete(&adapter->fw_done);
}
static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
int i;
dma_unmap_single(dev, adapter->ip_offload_tok,
sizeof(adapter->ip_offload_buf), DMA_FROM_DEVICE);
netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n");
for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++)
netdev_dbg(adapter->netdev, "%016lx\n",
((unsigned long *)(buf))[i]);
netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum);
netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum);
netdev_dbg(adapter->netdev, "tcp_ipv4_chksum = %d\n",
buf->tcp_ipv4_chksum);
netdev_dbg(adapter->netdev, "tcp_ipv6_chksum = %d\n",
buf->tcp_ipv6_chksum);
netdev_dbg(adapter->netdev, "udp_ipv4_chksum = %d\n",
buf->udp_ipv4_chksum);
netdev_dbg(adapter->netdev, "udp_ipv6_chksum = %d\n",
buf->udp_ipv6_chksum);
netdev_dbg(adapter->netdev, "large_tx_ipv4 = %d\n",
buf->large_tx_ipv4);
netdev_dbg(adapter->netdev, "large_tx_ipv6 = %d\n",
buf->large_tx_ipv6);
netdev_dbg(adapter->netdev, "large_rx_ipv4 = %d\n",
buf->large_rx_ipv4);
netdev_dbg(adapter->netdev, "large_rx_ipv6 = %d\n",
buf->large_rx_ipv6);
netdev_dbg(adapter->netdev, "max_ipv4_hdr_sz = %d\n",
buf->max_ipv4_header_size);
netdev_dbg(adapter->netdev, "max_ipv6_hdr_sz = %d\n",
buf->max_ipv6_header_size);
netdev_dbg(adapter->netdev, "max_tcp_hdr_size = %d\n",
buf->max_tcp_header_size);
netdev_dbg(adapter->netdev, "max_udp_hdr_size = %d\n",
buf->max_udp_header_size);
netdev_dbg(adapter->netdev, "max_large_tx_size = %d\n",
buf->max_large_tx_size);
netdev_dbg(adapter->netdev, "max_large_rx_size = %d\n",
buf->max_large_rx_size);
netdev_dbg(adapter->netdev, "ipv6_ext_hdr = %d\n",
buf->ipv6_extension_header);
netdev_dbg(adapter->netdev, "tcp_pseudosum_req = %d\n",
buf->tcp_pseudosum_req);
netdev_dbg(adapter->netdev, "num_ipv6_ext_hd = %d\n",
buf->num_ipv6_ext_headers);
netdev_dbg(adapter->netdev, "off_ipv6_ext_hd = %d\n",
buf->off_ipv6_ext_headers);
send_control_ip_offload(adapter);
}
static const char *ibmvnic_fw_err_cause(u16 cause)
{
switch (cause) {
case ADAPTER_PROBLEM:
return "adapter problem";
case BUS_PROBLEM:
return "bus problem";
case FW_PROBLEM:
return "firmware problem";
case DD_PROBLEM:
return "device driver problem";
case EEH_RECOVERY:
return "EEH recovery";
case FW_UPDATED:
return "firmware updated";
case LOW_MEMORY:
return "low Memory";
default:
return "unknown";
}
}
static void handle_error_indication(union ibmvnic_crq *crq,
struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
u16 cause;
cause = be16_to_cpu(crq->error_indication.error_cause);
dev_warn_ratelimited(dev,
"Firmware reports %serror, cause: %s. Starting recovery...\n",
crq->error_indication.flags
& IBMVNIC_FATAL_ERROR ? "FATAL " : "",
ibmvnic_fw_err_cause(cause));
if (crq->error_indication.flags & IBMVNIC_FATAL_ERROR)
ibmvnic_reset(adapter, VNIC_RESET_FATAL);
else
ibmvnic_reset(adapter, VNIC_RESET_NON_FATAL);
}
static int handle_change_mac_rsp(union ibmvnic_crq *crq,
struct ibmvnic_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct device *dev = &adapter->vdev->dev;
long rc;
rc = crq->change_mac_addr_rsp.rc.code;
if (rc) {
dev_err(dev, "Error %ld in CHANGE_MAC_ADDR_RSP\n", rc);
goto out;
}
/* crq->change_mac_addr.mac_addr is the requested one
* crq->change_mac_addr_rsp.mac_addr is the returned valid one.
*/
eth_hw_addr_set(netdev, &crq->change_mac_addr_rsp.mac_addr[0]);
ether_addr_copy(adapter->mac_addr,
&crq->change_mac_addr_rsp.mac_addr[0]);
out:
complete(&adapter->fw_done);
return rc;
}
static void handle_request_cap_rsp(union ibmvnic_crq *crq,
struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
u64 *req_value;
char *name;
atomic_dec(&adapter->running_cap_crqs);
netdev_dbg(adapter->netdev, "Outstanding request-caps: %d\n",
atomic_read(&adapter->running_cap_crqs));
switch (be16_to_cpu(crq->request_capability_rsp.capability)) {
case REQ_TX_QUEUES:
req_value = &adapter->req_tx_queues;
name = "tx";
break;
case REQ_RX_QUEUES:
req_value = &adapter->req_rx_queues;
name = "rx";
break;
case REQ_RX_ADD_QUEUES:
req_value = &adapter->req_rx_add_queues;
name = "rx_add";
break;
case REQ_TX_ENTRIES_PER_SUBCRQ:
req_value = &adapter->req_tx_entries_per_subcrq;
name = "tx_entries_per_subcrq";
break;
case REQ_RX_ADD_ENTRIES_PER_SUBCRQ:
req_value = &adapter->req_rx_add_entries_per_subcrq;
name = "rx_add_entries_per_subcrq";
break;
case REQ_MTU:
req_value = &adapter->req_mtu;
name = "mtu";
break;
case PROMISC_REQUESTED:
req_value = &adapter->promisc;
name = "promisc";
break;
default:
dev_err(dev, "Got invalid cap request rsp %d\n",
crq->request_capability.capability);
return;
}
switch (crq->request_capability_rsp.rc.code) {
case SUCCESS:
break;
case PARTIALSUCCESS:
dev_info(dev, "req=%lld, rsp=%ld in %s queue, retrying.\n",
*req_value,
(long)be64_to_cpu(crq->request_capability_rsp.number),
name);
if (be16_to_cpu(crq->request_capability_rsp.capability) ==
REQ_MTU) {
pr_err("mtu of %llu is not supported. Reverting.\n",
*req_value);
*req_value = adapter->fallback.mtu;
} else {
*req_value =
be64_to_cpu(crq->request_capability_rsp.number);
}
send_request_cap(adapter, 1);
return;
default:
dev_err(dev, "Error %d in request cap rsp\n",
crq->request_capability_rsp.rc.code);
return;
}
/* Done receiving requested capabilities, query IP offload support */
if (atomic_read(&adapter->running_cap_crqs) == 0)
send_query_ip_offload(adapter);
}
static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
struct net_device *netdev = adapter->netdev;
struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf;
struct ibmvnic_login_buffer *login = adapter->login_buf;
u64 *tx_handle_array;
u64 *rx_handle_array;
int num_tx_pools;
int num_rx_pools;
u64 *size_array;
int i;
/* CHECK: Test/set of login_pending does not need to be atomic
* because only ibmvnic_tasklet tests/clears this.
*/
if (!adapter->login_pending) {
netdev_warn(netdev, "Ignoring unexpected login response\n");
return 0;
}
adapter->login_pending = false;
dma_unmap_single(dev, adapter->login_buf_token, adapter->login_buf_sz,
DMA_TO_DEVICE);
dma_unmap_single(dev, adapter->login_rsp_buf_token,
adapter->login_rsp_buf_sz, DMA_FROM_DEVICE);
/* If the number of queues requested can't be allocated by the
* server, the login response will return with code 1. We will need
* to resend the login buffer with fewer queues requested.
*/
if (login_rsp_crq->generic.rc.code) {
adapter->init_done_rc = login_rsp_crq->generic.rc.code;
complete(&adapter->init_done);
return 0;
}
if (adapter->failover_pending) {
adapter->init_done_rc = -EAGAIN;
netdev_dbg(netdev, "Failover pending, ignoring login response\n");
complete(&adapter->init_done);
/* login response buffer will be released on reset */
return 0;
}
netdev->mtu = adapter->req_mtu - ETH_HLEN;
netdev_dbg(adapter->netdev, "Login Response Buffer:\n");
for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) {
netdev_dbg(adapter->netdev, "%016lx\n",
((unsigned long *)(adapter->login_rsp_buf))[i]);
}
/* Sanity checks */
if (login->num_txcomp_subcrqs != login_rsp->num_txsubm_subcrqs ||
(be32_to_cpu(login->num_rxcomp_subcrqs) *
adapter->req_rx_add_queues !=
be32_to_cpu(login_rsp->num_rxadd_subcrqs))) {
dev_err(dev, "FATAL: Inconsistent login and login rsp\n");
ibmvnic_reset(adapter, VNIC_RESET_FATAL);
return -EIO;
}
size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
/* variable buffer sizes are not supported, so just read the
* first entry.
*/
adapter->cur_rx_buf_sz = be64_to_cpu(size_array[0]);
num_tx_pools = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
num_rx_pools = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
tx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
be32_to_cpu(adapter->login_rsp_buf->off_txsubm_subcrqs));
rx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
be32_to_cpu(adapter->login_rsp_buf->off_rxadd_subcrqs));
for (i = 0; i < num_tx_pools; i++)
adapter->tx_scrq[i]->handle = tx_handle_array[i];
for (i = 0; i < num_rx_pools; i++)
adapter->rx_scrq[i]->handle = rx_handle_array[i];
adapter->num_active_tx_scrqs = num_tx_pools;
adapter->num_active_rx_scrqs = num_rx_pools;
release_login_rsp_buffer(adapter);
release_login_buffer(adapter);
complete(&adapter->init_done);
return 0;
}
static void handle_request_unmap_rsp(union ibmvnic_crq *crq,
struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
long rc;
rc = crq->request_unmap_rsp.rc.code;
if (rc)
dev_err(dev, "Error %ld in REQUEST_UNMAP_RSP\n", rc);
}
static void handle_query_map_rsp(union ibmvnic_crq *crq,
struct ibmvnic_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct device *dev = &adapter->vdev->dev;
long rc;
rc = crq->query_map_rsp.rc.code;
if (rc) {
dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc);
return;
}
netdev_dbg(netdev, "page_size = %d\ntot_pages = %u\nfree_pages = %u\n",
crq->query_map_rsp.page_size,
__be32_to_cpu(crq->query_map_rsp.tot_pages),
__be32_to_cpu(crq->query_map_rsp.free_pages));
}
static void handle_query_cap_rsp(union ibmvnic_crq *crq,
struct ibmvnic_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct device *dev = &adapter->vdev->dev;
long rc;
atomic_dec(&adapter->running_cap_crqs);
netdev_dbg(netdev, "Outstanding queries: %d\n",
atomic_read(&adapter->running_cap_crqs));
rc = crq->query_capability.rc.code;
if (rc) {
dev_err(dev, "Error %ld in QUERY_CAP_RSP\n", rc);
goto out;
}
switch (be16_to_cpu(crq->query_capability.capability)) {
case MIN_TX_QUEUES:
adapter->min_tx_queues =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "min_tx_queues = %lld\n",
adapter->min_tx_queues);
break;
case MIN_RX_QUEUES:
adapter->min_rx_queues =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "min_rx_queues = %lld\n",
adapter->min_rx_queues);
break;
case MIN_RX_ADD_QUEUES:
adapter->min_rx_add_queues =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "min_rx_add_queues = %lld\n",
adapter->min_rx_add_queues);
break;
case MAX_TX_QUEUES:
adapter->max_tx_queues =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "max_tx_queues = %lld\n",
adapter->max_tx_queues);
break;
case MAX_RX_QUEUES:
adapter->max_rx_queues =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "max_rx_queues = %lld\n",
adapter->max_rx_queues);
break;
case MAX_RX_ADD_QUEUES:
adapter->max_rx_add_queues =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "max_rx_add_queues = %lld\n",
adapter->max_rx_add_queues);
break;
case MIN_TX_ENTRIES_PER_SUBCRQ:
adapter->min_tx_entries_per_subcrq =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "min_tx_entries_per_subcrq = %lld\n",
adapter->min_tx_entries_per_subcrq);
break;
case MIN_RX_ADD_ENTRIES_PER_SUBCRQ:
adapter->min_rx_add_entries_per_subcrq =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "min_rx_add_entrs_per_subcrq = %lld\n",
adapter->min_rx_add_entries_per_subcrq);
break;
case MAX_TX_ENTRIES_PER_SUBCRQ:
adapter->max_tx_entries_per_subcrq =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "max_tx_entries_per_subcrq = %lld\n",
adapter->max_tx_entries_per_subcrq);
break;
case MAX_RX_ADD_ENTRIES_PER_SUBCRQ:
adapter->max_rx_add_entries_per_subcrq =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "max_rx_add_entrs_per_subcrq = %lld\n",
adapter->max_rx_add_entries_per_subcrq);
break;
case TCP_IP_OFFLOAD:
adapter->tcp_ip_offload =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "tcp_ip_offload = %lld\n",
adapter->tcp_ip_offload);
break;
case PROMISC_SUPPORTED:
adapter->promisc_supported =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "promisc_supported = %lld\n",
adapter->promisc_supported);
break;
case MIN_MTU:
adapter->min_mtu = be64_to_cpu(crq->query_capability.number);
netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
netdev_dbg(netdev, "min_mtu = %lld\n", adapter->min_mtu);
break;
case MAX_MTU:
adapter->max_mtu = be64_to_cpu(crq->query_capability.number);
netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
netdev_dbg(netdev, "max_mtu = %lld\n", adapter->max_mtu);
break;
case MAX_MULTICAST_FILTERS:
adapter->max_multicast_filters =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "max_multicast_filters = %lld\n",
adapter->max_multicast_filters);
break;
case VLAN_HEADER_INSERTION:
adapter->vlan_header_insertion =
be64_to_cpu(crq->query_capability.number);
if (adapter->vlan_header_insertion)
netdev->features |= NETIF_F_HW_VLAN_STAG_TX;
netdev_dbg(netdev, "vlan_header_insertion = %lld\n",
adapter->vlan_header_insertion);
break;
case RX_VLAN_HEADER_INSERTION:
adapter->rx_vlan_header_insertion =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "rx_vlan_header_insertion = %lld\n",
adapter->rx_vlan_header_insertion);
break;
case MAX_TX_SG_ENTRIES:
adapter->max_tx_sg_entries =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "max_tx_sg_entries = %lld\n",
adapter->max_tx_sg_entries);
break;
case RX_SG_SUPPORTED:
adapter->rx_sg_supported =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "rx_sg_supported = %lld\n",
adapter->rx_sg_supported);
break;
case OPT_TX_COMP_SUB_QUEUES:
adapter->opt_tx_comp_sub_queues =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "opt_tx_comp_sub_queues = %lld\n",
adapter->opt_tx_comp_sub_queues);
break;
case OPT_RX_COMP_QUEUES:
adapter->opt_rx_comp_queues =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "opt_rx_comp_queues = %lld\n",
adapter->opt_rx_comp_queues);
break;
case OPT_RX_BUFADD_Q_PER_RX_COMP_Q:
adapter->opt_rx_bufadd_q_per_rx_comp_q =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "opt_rx_bufadd_q_per_rx_comp_q = %lld\n",
adapter->opt_rx_bufadd_q_per_rx_comp_q);
break;
case OPT_TX_ENTRIES_PER_SUBCRQ:
adapter->opt_tx_entries_per_subcrq =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "opt_tx_entries_per_subcrq = %lld\n",
adapter->opt_tx_entries_per_subcrq);
break;
case OPT_RXBA_ENTRIES_PER_SUBCRQ:
adapter->opt_rxba_entries_per_subcrq =
be64_to_cpu(crq->query_capability.number);
netdev_dbg(netdev, "opt_rxba_entries_per_subcrq = %lld\n",
adapter->opt_rxba_entries_per_subcrq);
break;
case TX_RX_DESC_REQ:
adapter->tx_rx_desc_req = crq->query_capability.number;
netdev_dbg(netdev, "tx_rx_desc_req = %llx\n",
adapter->tx_rx_desc_req);
break;
default:
netdev_err(netdev, "Got invalid cap rsp %d\n",
crq->query_capability.capability);
}
out:
if (atomic_read(&adapter->running_cap_crqs) == 0)
send_request_cap(adapter, 0);
}
static int send_query_phys_parms(struct ibmvnic_adapter *adapter)
{
union ibmvnic_crq crq;
int rc;
memset(&crq, 0, sizeof(crq));
crq.query_phys_parms.first = IBMVNIC_CRQ_CMD;
crq.query_phys_parms.cmd = QUERY_PHYS_PARMS;
mutex_lock(&adapter->fw_lock);
adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
rc = ibmvnic_send_crq(adapter, &crq);
if (rc) {
mutex_unlock(&adapter->fw_lock);
return rc;
}
rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
if (rc) {
mutex_unlock(&adapter->fw_lock);
return rc;
}
mutex_unlock(&adapter->fw_lock);
return adapter->fw_done_rc ? -EIO : 0;
}
static int handle_query_phys_parms_rsp(union ibmvnic_crq *crq,
struct ibmvnic_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
int rc;
__be32 rspeed = cpu_to_be32(crq->query_phys_parms_rsp.speed);
rc = crq->query_phys_parms_rsp.rc.code;
if (rc) {
netdev_err(netdev, "Error %d in QUERY_PHYS_PARMS\n", rc);
return rc;
}
switch (rspeed) {
case IBMVNIC_10MBPS:
adapter->speed = SPEED_10;
break;
case IBMVNIC_100MBPS:
adapter->speed = SPEED_100;
break;
case IBMVNIC_1GBPS:
adapter->speed = SPEED_1000;
break;
case IBMVNIC_10GBPS:
adapter->speed = SPEED_10000;
break;
case IBMVNIC_25GBPS:
adapter->speed = SPEED_25000;
break;
case IBMVNIC_40GBPS:
adapter->speed = SPEED_40000;
break;
case IBMVNIC_50GBPS:
adapter->speed = SPEED_50000;
break;
case IBMVNIC_100GBPS:
adapter->speed = SPEED_100000;
break;
case IBMVNIC_200GBPS:
adapter->speed = SPEED_200000;
break;
default:
if (netif_carrier_ok(netdev))
netdev_warn(netdev, "Unknown speed 0x%08x\n", rspeed);
adapter->speed = SPEED_UNKNOWN;
}
if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_FULL_DUPLEX)
adapter->duplex = DUPLEX_FULL;
else if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_HALF_DUPLEX)
adapter->duplex = DUPLEX_HALF;
else
adapter->duplex = DUPLEX_UNKNOWN;
return rc;
}
static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
struct ibmvnic_adapter *adapter)
{
struct ibmvnic_generic_crq *gen_crq = &crq->generic;
struct net_device *netdev = adapter->netdev;
struct device *dev = &adapter->vdev->dev;
u64 *u64_crq = (u64 *)crq;
long rc;
netdev_dbg(netdev, "Handling CRQ: %016lx %016lx\n",
(unsigned long)cpu_to_be64(u64_crq[0]),
(unsigned long)cpu_to_be64(u64_crq[1]));
switch (gen_crq->first) {
case IBMVNIC_CRQ_INIT_RSP:
switch (gen_crq->cmd) {
case IBMVNIC_CRQ_INIT:
dev_info(dev, "Partner initialized\n");
adapter->from_passive_init = true;
/* Discard any stale login responses from prev reset.
* CHECK: should we clear even on INIT_COMPLETE?
*/
adapter->login_pending = false;
if (adapter->state == VNIC_DOWN)
rc = ibmvnic_reset(adapter, VNIC_RESET_PASSIVE_INIT);
else
rc = ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
if (rc && rc != -EBUSY) {
/* We were unable to schedule the failover
* reset either because the adapter was still
* probing (eg: during kexec) or we could not
* allocate memory. Clear the failover_pending
* flag since no one else will. We ignore
* EBUSY because it means either FAILOVER reset
* is already scheduled or the adapter is
* being removed.
*/
netdev_err(netdev,
"Error %ld scheduling failover reset\n",
rc);
adapter->failover_pending = false;
}
if (!completion_done(&adapter->init_done)) {
if (!adapter->init_done_rc)
adapter->init_done_rc = -EAGAIN;
complete(&adapter->init_done);
}
break;
case IBMVNIC_CRQ_INIT_COMPLETE:
dev_info(dev, "Partner initialization complete\n");
adapter->crq.active = true;
send_version_xchg(adapter);
break;
default:
dev_err(dev, "Unknown crq cmd: %d\n", gen_crq->cmd);
}
return;
case IBMVNIC_CRQ_XPORT_EVENT:
netif_carrier_off(netdev);
adapter->crq.active = false;
/* terminate any thread waiting for a response
* from the device
*/
if (!completion_done(&adapter->fw_done)) {
adapter->fw_done_rc = -EIO;
complete(&adapter->fw_done);
}
/* if we got here during crq-init, retry crq-init */
if (!completion_done(&adapter->init_done)) {
adapter->init_done_rc = -EAGAIN;
complete(&adapter->init_done);
}
if (!completion_done(&adapter->stats_done))
complete(&adapter->stats_done);
if (test_bit(0, &adapter->resetting))
adapter->force_reset_recovery = true;
if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) {
dev_info(dev, "Migrated, re-enabling adapter\n");
ibmvnic_reset(adapter, VNIC_RESET_MOBILITY);
} else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) {
dev_info(dev, "Backing device failover detected\n");
adapter->failover_pending = true;
} else {
/* The adapter lost the connection */
dev_err(dev, "Virtual Adapter failed (rc=%d)\n",
gen_crq->cmd);
ibmvnic_reset(adapter, VNIC_RESET_FATAL);
}
return;
case IBMVNIC_CRQ_CMD_RSP:
break;
default:
dev_err(dev, "Got an invalid msg type 0x%02x\n",
gen_crq->first);
return;
}
switch (gen_crq->cmd) {
case VERSION_EXCHANGE_RSP:
rc = crq->version_exchange_rsp.rc.code;
if (rc) {
dev_err(dev, "Error %ld in VERSION_EXCHG_RSP\n", rc);
break;
}
ibmvnic_version =
be16_to_cpu(crq->version_exchange_rsp.version);
dev_info(dev, "Partner protocol version is %d\n",
ibmvnic_version);
send_query_cap(adapter);
break;
case QUERY_CAPABILITY_RSP:
handle_query_cap_rsp(crq, adapter);
break;
case QUERY_MAP_RSP:
handle_query_map_rsp(crq, adapter);
break;
case REQUEST_MAP_RSP:
adapter->fw_done_rc = crq->request_map_rsp.rc.code;
complete(&adapter->fw_done);
break;
case REQUEST_UNMAP_RSP:
handle_request_unmap_rsp(crq, adapter);
break;
case REQUEST_CAPABILITY_RSP:
handle_request_cap_rsp(crq, adapter);
break;
case LOGIN_RSP:
netdev_dbg(netdev, "Got Login Response\n");
handle_login_rsp(crq, adapter);
break;
case LOGICAL_LINK_STATE_RSP:
netdev_dbg(netdev,
"Got Logical Link State Response, state: %d rc: %d\n",
crq->logical_link_state_rsp.link_state,
crq->logical_link_state_rsp.rc.code);
adapter->logical_link_state =
crq->logical_link_state_rsp.link_state;
adapter->init_done_rc = crq->logical_link_state_rsp.rc.code;
complete(&adapter->init_done);
break;
case LINK_STATE_INDICATION:
netdev_dbg(netdev, "Got Logical Link State Indication\n");
adapter->phys_link_state =
crq->link_state_indication.phys_link_state;
adapter->logical_link_state =
crq->link_state_indication.logical_link_state;
if (adapter->phys_link_state && adapter->logical_link_state)
netif_carrier_on(netdev);
else
netif_carrier_off(netdev);
break;
case CHANGE_MAC_ADDR_RSP:
netdev_dbg(netdev, "Got MAC address change Response\n");
adapter->fw_done_rc = handle_change_mac_rsp(crq, adapter);
break;
case ERROR_INDICATION:
netdev_dbg(netdev, "Got Error Indication\n");
handle_error_indication(crq, adapter);
break;
case REQUEST_STATISTICS_RSP:
netdev_dbg(netdev, "Got Statistics Response\n");
complete(&adapter->stats_done);
break;
case QUERY_IP_OFFLOAD_RSP:
netdev_dbg(netdev, "Got Query IP offload Response\n");
handle_query_ip_offload_rsp(adapter);
break;
case MULTICAST_CTRL_RSP:
netdev_dbg(netdev, "Got multicast control Response\n");
break;
case CONTROL_IP_OFFLOAD_RSP:
netdev_dbg(netdev, "Got Control IP offload Response\n");
dma_unmap_single(dev, adapter->ip_offload_ctrl_tok,
sizeof(adapter->ip_offload_ctrl),
DMA_TO_DEVICE);
complete(&adapter->init_done);
break;
case COLLECT_FW_TRACE_RSP:
netdev_dbg(netdev, "Got Collect firmware trace Response\n");
complete(&adapter->fw_done);
break;
case GET_VPD_SIZE_RSP:
handle_vpd_size_rsp(crq, adapter);
break;
case GET_VPD_RSP:
handle_vpd_rsp(crq, adapter);
break;
case QUERY_PHYS_PARMS_RSP:
adapter->fw_done_rc = handle_query_phys_parms_rsp(crq, adapter);
complete(&adapter->fw_done);
break;
default:
netdev_err(netdev, "Got an invalid cmd type 0x%02x\n",
gen_crq->cmd);
}
}
static irqreturn_t ibmvnic_interrupt(int irq, void *instance)
{
struct ibmvnic_adapter *adapter = instance;
tasklet_schedule(&adapter->tasklet);
return IRQ_HANDLED;
}
static void ibmvnic_tasklet(struct tasklet_struct *t)
{
struct ibmvnic_adapter *adapter = from_tasklet(adapter, t, tasklet);
struct ibmvnic_crq_queue *queue = &adapter->crq;
union ibmvnic_crq *crq;
unsigned long flags;
spin_lock_irqsave(&queue->lock, flags);
/* Pull all the valid messages off the CRQ */
while ((crq = ibmvnic_next_crq(adapter)) != NULL) {
/* This barrier makes sure ibmvnic_next_crq()'s
* crq->generic.first & IBMVNIC_CRQ_CMD_RSP is loaded
* before ibmvnic_handle_crq()'s
* switch(gen_crq->first) and switch(gen_crq->cmd).
*/
dma_rmb();
ibmvnic_handle_crq(crq, adapter);
crq->generic.first = 0;
}
spin_unlock_irqrestore(&queue->lock, flags);
}
static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *adapter)
{
struct vio_dev *vdev = adapter->vdev;
int rc;
do {
rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
if (rc)
dev_err(&vdev->dev, "Error enabling adapter (rc=%d)\n", rc);
return rc;
}
static int ibmvnic_reset_crq(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_crq_queue *crq = &adapter->crq;
struct device *dev = &adapter->vdev->dev;
struct vio_dev *vdev = adapter->vdev;
int rc;
/* Close the CRQ */
do {
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
/* Clean out the queue */
if (!crq->msgs)
return -EINVAL;
memset(crq->msgs, 0, PAGE_SIZE);
crq->cur = 0;
crq->active = false;
/* And re-open it again */
rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
crq->msg_token, PAGE_SIZE);
if (rc == H_CLOSED)
/* Adapter is good, but other end is not ready */
dev_warn(dev, "Partner adapter not ready\n");
else if (rc != 0)
dev_warn(dev, "Couldn't register crq (rc=%d)\n", rc);
return rc;
}
static void release_crq_queue(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_crq_queue *crq = &adapter->crq;
struct vio_dev *vdev = adapter->vdev;
long rc;
if (!crq->msgs)
return;
netdev_dbg(adapter->netdev, "Releasing CRQ\n");
free_irq(vdev->irq, adapter);
tasklet_kill(&adapter->tasklet);
do {
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
dma_unmap_single(&vdev->dev, crq->msg_token, PAGE_SIZE,
DMA_BIDIRECTIONAL);
free_page((unsigned long)crq->msgs);
crq->msgs = NULL;
crq->active = false;
}
static int init_crq_queue(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_crq_queue *crq = &adapter->crq;
struct device *dev = &adapter->vdev->dev;
struct vio_dev *vdev = adapter->vdev;
int rc, retrc = -ENOMEM;
if (crq->msgs)
return 0;
crq->msgs = (union ibmvnic_crq *)get_zeroed_page(GFP_KERNEL);
/* Should we allocate more than one page? */
if (!crq->msgs)
return -ENOMEM;
crq->size = PAGE_SIZE / sizeof(*crq->msgs);
crq->msg_token = dma_map_single(dev, crq->msgs, PAGE_SIZE,
DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, crq->msg_token))
goto map_failed;
rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
crq->msg_token, PAGE_SIZE);
if (rc == H_RESOURCE)
/* maybe kexecing and resource is busy. try a reset */
rc = ibmvnic_reset_crq(adapter);
retrc = rc;
if (rc == H_CLOSED) {
dev_warn(dev, "Partner adapter not ready\n");
} else if (rc) {
dev_warn(dev, "Error %d opening adapter\n", rc);
goto reg_crq_failed;
}
retrc = 0;
tasklet_setup(&adapter->tasklet, (void *)ibmvnic_tasklet);
netdev_dbg(adapter->netdev, "registering irq 0x%x\n", vdev->irq);
snprintf(crq->name, sizeof(crq->name), "ibmvnic-%x",
adapter->vdev->unit_address);
rc = request_irq(vdev->irq, ibmvnic_interrupt, 0, crq->name, adapter);
if (rc) {
dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n",
vdev->irq, rc);
goto req_irq_failed;
}
rc = vio_enable_interrupts(vdev);
if (rc) {
dev_err(dev, "Error %d enabling interrupts\n", rc);
goto req_irq_failed;
}
crq->cur = 0;
spin_lock_init(&crq->lock);
/* process any CRQs that were queued before we enabled interrupts */
tasklet_schedule(&adapter->tasklet);
return retrc;
req_irq_failed:
tasklet_kill(&adapter->tasklet);
do {
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
reg_crq_failed:
dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
map_failed:
free_page((unsigned long)crq->msgs);
crq->msgs = NULL;
return retrc;
}
static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)
{
struct device *dev = &adapter->vdev->dev;
unsigned long timeout = msecs_to_jiffies(20000);
u64 old_num_rx_queues = adapter->req_rx_queues;
u64 old_num_tx_queues = adapter->req_tx_queues;
int rc;
adapter->from_passive_init = false;
rc = ibmvnic_send_crq_init(adapter);
if (rc) {
dev_err(dev, "Send crq init failed with error %d\n", rc);
return rc;
}
if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
dev_err(dev, "Initialization sequence timed out\n");
return -ETIMEDOUT;
}
if (adapter->init_done_rc) {
release_crq_queue(adapter);
dev_err(dev, "CRQ-init failed, %d\n", adapter->init_done_rc);
return adapter->init_done_rc;
}
if (adapter->from_passive_init) {
adapter->state = VNIC_OPEN;
adapter->from_passive_init = false;
dev_err(dev, "CRQ-init failed, passive-init\n");
return -EINVAL;
}
if (reset &&
test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
adapter->reset_reason != VNIC_RESET_MOBILITY) {
if (adapter->req_rx_queues != old_num_rx_queues ||
adapter->req_tx_queues != old_num_tx_queues) {
release_sub_crqs(adapter, 0);
rc = init_sub_crqs(adapter);
} else {
/* no need to reinitialize completely, but we do
* need to clean up transmits that were in flight
* when we processed the reset. Failure to do so
* will confound the upper layer, usually TCP, by
* creating the illusion of transmits that are
* awaiting completion.
*/
clean_tx_pools(adapter);
rc = reset_sub_crq_queues(adapter);
}
} else {
rc = init_sub_crqs(adapter);
}
if (rc) {
dev_err(dev, "Initialization of sub crqs failed\n");
release_crq_queue(adapter);
return rc;
}
rc = init_sub_crq_irqs(adapter);
if (rc) {
dev_err(dev, "Failed to initialize sub crq irqs\n");
release_crq_queue(adapter);
}
return rc;
}
static struct device_attribute dev_attr_failover;
static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
{
struct ibmvnic_adapter *adapter;
struct net_device *netdev;
unsigned char *mac_addr_p;
unsigned long flags;
bool init_success;
int rc;
dev_dbg(&dev->dev, "entering ibmvnic_probe for UA 0x%x\n",
dev->unit_address);
mac_addr_p = (unsigned char *)vio_get_attribute(dev,
VETH_MAC_ADDR, NULL);
if (!mac_addr_p) {
dev_err(&dev->dev,
"(%s:%3.3d) ERROR: Can't find MAC_ADDR attribute\n",
__FILE__, __LINE__);
return 0;
}
netdev = alloc_etherdev_mq(sizeof(struct ibmvnic_adapter),
IBMVNIC_MAX_QUEUES);
if (!netdev)
return -ENOMEM;
adapter = netdev_priv(netdev);
adapter->state = VNIC_PROBING;
dev_set_drvdata(&dev->dev, netdev);
adapter->vdev = dev;
adapter->netdev = netdev;
adapter->login_pending = false;
memset(&adapter->map_ids, 0, sizeof(adapter->map_ids));
/* map_ids start at 1, so ensure map_id 0 is always "in-use" */
bitmap_set(adapter->map_ids, 0, 1);
ether_addr_copy(adapter->mac_addr, mac_addr_p);
eth_hw_addr_set(netdev, adapter->mac_addr);
netdev->irq = dev->irq;
netdev->netdev_ops = &ibmvnic_netdev_ops;
netdev->ethtool_ops = &ibmvnic_ethtool_ops;
SET_NETDEV_DEV(netdev, &dev->dev);
INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset);
INIT_DELAYED_WORK(&adapter->ibmvnic_delayed_reset,
__ibmvnic_delayed_reset);
INIT_LIST_HEAD(&adapter->rwi_list);
spin_lock_init(&adapter->rwi_lock);
spin_lock_init(&adapter->state_lock);
mutex_init(&adapter->fw_lock);
init_completion(&adapter->probe_done);
init_completion(&adapter->init_done);
init_completion(&adapter->fw_done);
init_completion(&adapter->reset_done);
init_completion(&adapter->stats_done);
clear_bit(0, &adapter->resetting);
adapter->prev_rx_buf_sz = 0;
adapter->prev_mtu = 0;
init_success = false;
do {
reinit_init_done(adapter);
/* clear any failovers we got in the previous pass
* since we are reinitializing the CRQ
*/
adapter->failover_pending = false;
/* If we had already initialized CRQ, we may have one or
* more resets queued already. Discard those and release
* the CRQ before initializing the CRQ again.
*/
release_crq_queue(adapter);
/* Since we are still in PROBING state, __ibmvnic_reset()
* will not access the ->rwi_list and since we released CRQ,
* we won't get _new_ transport events. But there maybe an
* ongoing ibmvnic_reset() call. So serialize access to
* rwi_list. If we win the race, ibvmnic_reset() could add
* a reset after we purged but thats ok - we just may end
* up with an extra reset (i.e similar to having two or more
* resets in the queue at once).
* CHECK.
*/
spin_lock_irqsave(&adapter->rwi_lock, flags);
flush_reset_queue(adapter);
spin_unlock_irqrestore(&adapter->rwi_lock, flags);
rc = init_crq_queue(adapter);
if (rc) {
dev_err(&dev->dev, "Couldn't initialize crq. rc=%d\n",
rc);
goto ibmvnic_init_fail;
}
rc = ibmvnic_reset_init(adapter, false);
} while (rc == -EAGAIN);
/* We are ignoring the error from ibmvnic_reset_init() assuming that the
* partner is not ready. CRQ is not active. When the partner becomes
* ready, we will do the passive init reset.
*/
if (!rc)
init_success = true;
rc = init_stats_buffers(adapter);
if (rc)
goto ibmvnic_init_fail;
rc = init_stats_token(adapter);
if (rc)
goto ibmvnic_stats_fail;
rc = device_create_file(&dev->dev, &dev_attr_failover);
if (rc)
goto ibmvnic_dev_file_err;
netif_carrier_off(netdev);
if (init_success) {
adapter->state = VNIC_PROBED;
netdev->mtu = adapter->req_mtu - ETH_HLEN;
netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
} else {
adapter->state = VNIC_DOWN;
}
adapter->wait_for_reset = false;
adapter->last_reset_time = jiffies;
rc = register_netdev(netdev);
if (rc) {
dev_err(&dev->dev, "failed to register netdev rc=%d\n", rc);
goto ibmvnic_register_fail;
}
dev_info(&dev->dev, "ibmvnic registered\n");
complete(&adapter->probe_done);
return 0;
ibmvnic_register_fail:
device_remove_file(&dev->dev, &dev_attr_failover);
ibmvnic_dev_file_err:
release_stats_token(adapter);
ibmvnic_stats_fail:
release_stats_buffers(adapter);
ibmvnic_init_fail:
release_sub_crqs(adapter, 1);
release_crq_queue(adapter);
/* cleanup worker thread after releasing CRQ so we don't get
* transport events (i.e new work items for the worker thread).
*/
adapter->state = VNIC_REMOVING;
complete(&adapter->probe_done);
flush_work(&adapter->ibmvnic_reset);
flush_delayed_work(&adapter->ibmvnic_delayed_reset);
flush_reset_queue(adapter);
mutex_destroy(&adapter->fw_lock);
free_netdev(netdev);
return rc;
}
static void ibmvnic_remove(struct vio_dev *dev)
{
struct net_device *netdev = dev_get_drvdata(&dev->dev);
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
unsigned long flags;
spin_lock_irqsave(&adapter->state_lock, flags);
/* If ibmvnic_reset() is scheduling a reset, wait for it to
* finish. Then, set the state to REMOVING to prevent it from
* scheduling any more work and to have reset functions ignore
* any resets that have already been scheduled. Drop the lock
* after setting state, so __ibmvnic_reset() which is called
* from the flush_work() below, can make progress.
*/
spin_lock(&adapter->rwi_lock);
adapter->state = VNIC_REMOVING;
spin_unlock(&adapter->rwi_lock);
spin_unlock_irqrestore(&adapter->state_lock, flags);
flush_work(&adapter->ibmvnic_reset);
flush_delayed_work(&adapter->ibmvnic_delayed_reset);
rtnl_lock();
unregister_netdevice(netdev);
release_resources(adapter);
release_rx_pools(adapter);
release_tx_pools(adapter);
release_sub_crqs(adapter, 1);
release_crq_queue(adapter);
release_stats_token(adapter);
release_stats_buffers(adapter);
adapter->state = VNIC_REMOVED;
rtnl_unlock();
mutex_destroy(&adapter->fw_lock);
device_remove_file(&dev->dev, &dev_attr_failover);
free_netdev(netdev);
dev_set_drvdata(&dev->dev, NULL);
}
static ssize_t failover_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct net_device *netdev = dev_get_drvdata(dev);
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
__be64 session_token;
long rc;
if (!sysfs_streq(buf, "1"))
return -EINVAL;
rc = plpar_hcall(H_VIOCTL, retbuf, adapter->vdev->unit_address,
H_GET_SESSION_TOKEN, 0, 0, 0);
if (rc) {
netdev_err(netdev, "Couldn't retrieve session token, rc %ld\n",
rc);
goto last_resort;
}
session_token = (__be64)retbuf[0];
netdev_dbg(netdev, "Initiating client failover, session id %llx\n",
be64_to_cpu(session_token));
rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
H_SESSION_ERR_DETECTED, session_token, 0, 0);
if (rc) {
netdev_err(netdev,
"H_VIOCTL initiated failover failed, rc %ld\n",
rc);
goto last_resort;
}
return count;
last_resort:
netdev_dbg(netdev, "Trying to send CRQ_CMD, the last resort\n");
ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
return count;
}
static DEVICE_ATTR_WO(failover);
static unsigned long ibmvnic_get_desired_dma(struct vio_dev *vdev)
{
struct net_device *netdev = dev_get_drvdata(&vdev->dev);
struct ibmvnic_adapter *adapter;
struct iommu_table *tbl;
unsigned long ret = 0;
int i;
tbl = get_iommu_table_base(&vdev->dev);
/* netdev inits at probe time along with the structures we need below*/
if (!netdev)
return IOMMU_PAGE_ALIGN(IBMVNIC_IO_ENTITLEMENT_DEFAULT, tbl);
adapter = netdev_priv(netdev);
ret += PAGE_SIZE; /* the crq message queue */
ret += IOMMU_PAGE_ALIGN(sizeof(struct ibmvnic_statistics), tbl);
for (i = 0; i < adapter->req_tx_queues + adapter->req_rx_queues; i++)
ret += 4 * PAGE_SIZE; /* the scrq message queue */
for (i = 0; i < adapter->num_active_rx_pools; i++)
ret += adapter->rx_pool[i].size *
IOMMU_PAGE_ALIGN(adapter->rx_pool[i].buff_size, tbl);
return ret;
}
static int ibmvnic_resume(struct device *dev)
{
struct net_device *netdev = dev_get_drvdata(dev);
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
if (adapter->state != VNIC_OPEN)
return 0;
tasklet_schedule(&adapter->tasklet);
return 0;
}
static const struct vio_device_id ibmvnic_device_table[] = {
{"network", "IBM,vnic"},
{"", "" }
};
MODULE_DEVICE_TABLE(vio, ibmvnic_device_table);
static const struct dev_pm_ops ibmvnic_pm_ops = {
.resume = ibmvnic_resume
};
static struct vio_driver ibmvnic_driver = {
.id_table = ibmvnic_device_table,
.probe = ibmvnic_probe,
.remove = ibmvnic_remove,
.get_desired_dma = ibmvnic_get_desired_dma,
.name = ibmvnic_driver_name,
.pm = &ibmvnic_pm_ops,
};
/* module functions */
static int __init ibmvnic_module_init(void)
{
pr_info("%s: %s %s\n", ibmvnic_driver_name, ibmvnic_driver_string,
IBMVNIC_DRIVER_VERSION);
return vio_register_driver(&ibmvnic_driver);
}
static void __exit ibmvnic_module_exit(void)
{
vio_unregister_driver(&ibmvnic_driver);
}
module_init(ibmvnic_module_init);
module_exit(ibmvnic_module_exit);
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