linux/drivers/infiniband/ulp/iser/iser_verbs.c
Or Gerlitz 5525d210fd IB/iser: Enable iser when FMRs are not supported
Reuse the "SG unaligned for FMR" driver flow to make the initiator
functional when running over driver instance which doesn't support
FMRs, such as a mlx4 virtual function.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Alex Tabachnik <alext@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
2013-02-22 00:22:30 -08:00

922 lines
25 KiB
C

/*
* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include "iscsi_iser.h"
#define ISCSI_ISER_MAX_CONN 8
#define ISER_MAX_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN)
#define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN)
static void iser_cq_tasklet_fn(unsigned long data);
static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
static void iser_cq_event_callback(struct ib_event *cause, void *context)
{
iser_err("got cq event %d \n", cause->event);
}
static void iser_qp_event_callback(struct ib_event *cause, void *context)
{
iser_err("got qp event %d\n",cause->event);
}
static void iser_event_handler(struct ib_event_handler *handler,
struct ib_event *event)
{
iser_err("async event %d on device %s port %d\n", event->event,
event->device->name, event->element.port_num);
}
/**
* iser_create_device_ib_res - creates Protection Domain (PD), Completion
* Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
* the adapator.
*
* returns 0 on success, -1 on failure
*/
static int iser_create_device_ib_res(struct iser_device *device)
{
int i, j;
struct iser_cq_desc *cq_desc;
device->cqs_used = min(ISER_MAX_CQ, device->ib_device->num_comp_vectors);
iser_err("using %d CQs, device %s supports %d vectors\n", device->cqs_used,
device->ib_device->name, device->ib_device->num_comp_vectors);
device->cq_desc = kmalloc(sizeof(struct iser_cq_desc) * device->cqs_used,
GFP_KERNEL);
if (device->cq_desc == NULL)
goto cq_desc_err;
cq_desc = device->cq_desc;
device->pd = ib_alloc_pd(device->ib_device);
if (IS_ERR(device->pd))
goto pd_err;
for (i = 0; i < device->cqs_used; i++) {
cq_desc[i].device = device;
cq_desc[i].cq_index = i;
device->rx_cq[i] = ib_create_cq(device->ib_device,
iser_cq_callback,
iser_cq_event_callback,
(void *)&cq_desc[i],
ISER_MAX_RX_CQ_LEN, i);
if (IS_ERR(device->rx_cq[i]))
goto cq_err;
device->tx_cq[i] = ib_create_cq(device->ib_device,
NULL, iser_cq_event_callback,
(void *)&cq_desc[i],
ISER_MAX_TX_CQ_LEN, i);
if (IS_ERR(device->tx_cq[i]))
goto cq_err;
if (ib_req_notify_cq(device->rx_cq[i], IB_CQ_NEXT_COMP))
goto cq_err;
tasklet_init(&device->cq_tasklet[i],
iser_cq_tasklet_fn,
(unsigned long)&cq_desc[i]);
}
device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_READ);
if (IS_ERR(device->mr))
goto dma_mr_err;
INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device,
iser_event_handler);
if (ib_register_event_handler(&device->event_handler))
goto handler_err;
return 0;
handler_err:
ib_dereg_mr(device->mr);
dma_mr_err:
for (j = 0; j < device->cqs_used; j++)
tasklet_kill(&device->cq_tasklet[j]);
cq_err:
for (j = 0; j < i; j++) {
if (device->tx_cq[j])
ib_destroy_cq(device->tx_cq[j]);
if (device->rx_cq[j])
ib_destroy_cq(device->rx_cq[j]);
}
ib_dealloc_pd(device->pd);
pd_err:
kfree(device->cq_desc);
cq_desc_err:
iser_err("failed to allocate an IB resource\n");
return -1;
}
/**
* iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,
* CQ and PD created with the device associated with the adapator.
*/
static void iser_free_device_ib_res(struct iser_device *device)
{
int i;
BUG_ON(device->mr == NULL);
for (i = 0; i < device->cqs_used; i++) {
tasklet_kill(&device->cq_tasklet[i]);
(void)ib_destroy_cq(device->tx_cq[i]);
(void)ib_destroy_cq(device->rx_cq[i]);
device->tx_cq[i] = NULL;
device->rx_cq[i] = NULL;
}
(void)ib_unregister_event_handler(&device->event_handler);
(void)ib_dereg_mr(device->mr);
(void)ib_dealloc_pd(device->pd);
kfree(device->cq_desc);
device->mr = NULL;
device->pd = NULL;
}
/**
* iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP)
*
* returns 0 on success, -1 on failure
*/
static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
{
struct iser_device *device;
struct ib_qp_init_attr init_attr;
int req_err, resp_err, ret = -ENOMEM;
struct ib_fmr_pool_param params;
int index, min_index = 0;
BUG_ON(ib_conn->device == NULL);
device = ib_conn->device;
ib_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
ISER_RX_LOGIN_SIZE, GFP_KERNEL);
if (!ib_conn->login_buf)
goto out_err;
ib_conn->login_req_buf = ib_conn->login_buf;
ib_conn->login_resp_buf = ib_conn->login_buf + ISCSI_DEF_MAX_RECV_SEG_LEN;
ib_conn->login_req_dma = ib_dma_map_single(ib_conn->device->ib_device,
(void *)ib_conn->login_req_buf,
ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
ib_conn->login_resp_dma = ib_dma_map_single(ib_conn->device->ib_device,
(void *)ib_conn->login_resp_buf,
ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
req_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_req_dma);
resp_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_resp_dma);
if (req_err || resp_err) {
if (req_err)
ib_conn->login_req_dma = 0;
if (resp_err)
ib_conn->login_resp_dma = 0;
goto out_err;
}
ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) +
(sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)),
GFP_KERNEL);
if (!ib_conn->page_vec)
goto out_err;
ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1);
params.page_shift = SHIFT_4K;
/* when the first/last SG element are not start/end *
* page aligned, the map whould be of N+1 pages */
params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
/* make the pool size twice the max number of SCSI commands *
* the ML is expected to queue, watermark for unmap at 50% */
params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2;
params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX;
params.cache = 0;
params.flush_function = NULL;
params.access = (IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_READ);
ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, &params);
ret = PTR_ERR(ib_conn->fmr_pool);
if (IS_ERR(ib_conn->fmr_pool) && ret != -ENOSYS) {
ib_conn->fmr_pool = NULL;
goto out_err;
} else if (ret == -ENOSYS) {
ib_conn->fmr_pool = NULL;
iser_warn("FMRs are not supported, using unaligned mode\n");
ret = 0;
}
memset(&init_attr, 0, sizeof init_attr);
mutex_lock(&ig.connlist_mutex);
/* select the CQ with the minimal number of usages */
for (index = 0; index < device->cqs_used; index++)
if (device->cq_active_qps[index] <
device->cq_active_qps[min_index])
min_index = index;
device->cq_active_qps[min_index]++;
mutex_unlock(&ig.connlist_mutex);
iser_err("cq index %d used for ib_conn %p\n", min_index, ib_conn);
init_attr.event_handler = iser_qp_event_callback;
init_attr.qp_context = (void *)ib_conn;
init_attr.send_cq = device->tx_cq[min_index];
init_attr.recv_cq = device->rx_cq[min_index];
init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
init_attr.cap.max_send_sge = 2;
init_attr.cap.max_recv_sge = 1;
init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
init_attr.qp_type = IB_QPT_RC;
ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
if (ret)
goto out_err;
ib_conn->qp = ib_conn->cma_id->qp;
iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n",
ib_conn, ib_conn->cma_id,
ib_conn->fmr_pool, ib_conn->cma_id->qp);
return ret;
out_err:
iser_err("unable to alloc mem or create resource, err %d\n", ret);
return ret;
}
/**
* releases the FMR pool, QP and CMA ID objects, returns 0 on success,
* -1 on failure
*/
static int iser_free_ib_conn_res(struct iser_conn *ib_conn, int can_destroy_id)
{
int cq_index;
BUG_ON(ib_conn == NULL);
iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n",
ib_conn, ib_conn->cma_id,
ib_conn->fmr_pool, ib_conn->qp);
/* qp is created only once both addr & route are resolved */
if (ib_conn->fmr_pool != NULL)
ib_destroy_fmr_pool(ib_conn->fmr_pool);
if (ib_conn->qp != NULL) {
cq_index = ((struct iser_cq_desc *)ib_conn->qp->recv_cq->cq_context)->cq_index;
ib_conn->device->cq_active_qps[cq_index]--;
rdma_destroy_qp(ib_conn->cma_id);
}
/* if cma handler context, the caller acts s.t the cma destroy the id */
if (ib_conn->cma_id != NULL && can_destroy_id)
rdma_destroy_id(ib_conn->cma_id);
ib_conn->fmr_pool = NULL;
ib_conn->qp = NULL;
ib_conn->cma_id = NULL;
kfree(ib_conn->page_vec);
if (ib_conn->login_buf) {
if (ib_conn->login_req_dma)
ib_dma_unmap_single(ib_conn->device->ib_device,
ib_conn->login_req_dma,
ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
if (ib_conn->login_resp_dma)
ib_dma_unmap_single(ib_conn->device->ib_device,
ib_conn->login_resp_dma,
ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
kfree(ib_conn->login_buf);
}
return 0;
}
/**
* based on the resolved device node GUID see if there already allocated
* device for this device. If there's no such, create one.
*/
static
struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
{
struct iser_device *device;
mutex_lock(&ig.device_list_mutex);
list_for_each_entry(device, &ig.device_list, ig_list)
/* find if there's a match using the node GUID */
if (device->ib_device->node_guid == cma_id->device->node_guid)
goto inc_refcnt;
device = kzalloc(sizeof *device, GFP_KERNEL);
if (device == NULL)
goto out;
/* assign this device to the device */
device->ib_device = cma_id->device;
/* init the device and link it into ig device list */
if (iser_create_device_ib_res(device)) {
kfree(device);
device = NULL;
goto out;
}
list_add(&device->ig_list, &ig.device_list);
inc_refcnt:
device->refcount++;
out:
mutex_unlock(&ig.device_list_mutex);
return device;
}
/* if there's no demand for this device, release it */
static void iser_device_try_release(struct iser_device *device)
{
mutex_lock(&ig.device_list_mutex);
device->refcount--;
iser_err("device %p refcount %d\n",device,device->refcount);
if (!device->refcount) {
iser_free_device_ib_res(device);
list_del(&device->ig_list);
kfree(device);
}
mutex_unlock(&ig.device_list_mutex);
}
static int iser_conn_state_comp_exch(struct iser_conn *ib_conn,
enum iser_ib_conn_state comp,
enum iser_ib_conn_state exch)
{
int ret;
spin_lock_bh(&ib_conn->lock);
if ((ret = (ib_conn->state == comp)))
ib_conn->state = exch;
spin_unlock_bh(&ib_conn->lock);
return ret;
}
/**
* Frees all conn objects and deallocs conn descriptor
*/
static void iser_conn_release(struct iser_conn *ib_conn, int can_destroy_id)
{
struct iser_device *device = ib_conn->device;
BUG_ON(ib_conn->state != ISER_CONN_DOWN);
mutex_lock(&ig.connlist_mutex);
list_del(&ib_conn->conn_list);
mutex_unlock(&ig.connlist_mutex);
iser_free_rx_descriptors(ib_conn);
iser_free_ib_conn_res(ib_conn, can_destroy_id);
ib_conn->device = NULL;
/* on EVENT_ADDR_ERROR there's no device yet for this conn */
if (device != NULL)
iser_device_try_release(device);
iscsi_destroy_endpoint(ib_conn->ep);
}
void iser_conn_get(struct iser_conn *ib_conn)
{
atomic_inc(&ib_conn->refcount);
}
int iser_conn_put(struct iser_conn *ib_conn, int can_destroy_id)
{
if (atomic_dec_and_test(&ib_conn->refcount)) {
iser_conn_release(ib_conn, can_destroy_id);
return 1;
}
return 0;
}
/**
* triggers start of the disconnect procedures and wait for them to be done
*/
void iser_conn_terminate(struct iser_conn *ib_conn)
{
int err = 0;
/* change the ib conn state only if the conn is UP, however always call
* rdma_disconnect since this is the only way to cause the CMA to change
* the QP state to ERROR
*/
iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING);
err = rdma_disconnect(ib_conn->cma_id);
if (err)
iser_err("Failed to disconnect, conn: 0x%p err %d\n",
ib_conn,err);
wait_event_interruptible(ib_conn->wait,
ib_conn->state == ISER_CONN_DOWN);
iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */
}
static int iser_connect_error(struct rdma_cm_id *cma_id)
{
struct iser_conn *ib_conn;
ib_conn = (struct iser_conn *)cma_id->context;
ib_conn->state = ISER_CONN_DOWN;
wake_up_interruptible(&ib_conn->wait);
return iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */
}
static int iser_addr_handler(struct rdma_cm_id *cma_id)
{
struct iser_device *device;
struct iser_conn *ib_conn;
int ret;
device = iser_device_find_by_ib_device(cma_id);
if (!device) {
iser_err("device lookup/creation failed\n");
return iser_connect_error(cma_id);
}
ib_conn = (struct iser_conn *)cma_id->context;
ib_conn->device = device;
ret = rdma_resolve_route(cma_id, 1000);
if (ret) {
iser_err("resolve route failed: %d\n", ret);
return iser_connect_error(cma_id);
}
return 0;
}
static int iser_route_handler(struct rdma_cm_id *cma_id)
{
struct rdma_conn_param conn_param;
int ret;
ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context);
if (ret)
goto failure;
memset(&conn_param, 0, sizeof conn_param);
conn_param.responder_resources = 4;
conn_param.initiator_depth = 1;
conn_param.retry_count = 7;
conn_param.rnr_retry_count = 6;
ret = rdma_connect(cma_id, &conn_param);
if (ret) {
iser_err("failure connecting: %d\n", ret);
goto failure;
}
return 0;
failure:
return iser_connect_error(cma_id);
}
static void iser_connected_handler(struct rdma_cm_id *cma_id)
{
struct iser_conn *ib_conn;
ib_conn = (struct iser_conn *)cma_id->context;
ib_conn->state = ISER_CONN_UP;
wake_up_interruptible(&ib_conn->wait);
}
static int iser_disconnected_handler(struct rdma_cm_id *cma_id)
{
struct iser_conn *ib_conn;
int ret;
ib_conn = (struct iser_conn *)cma_id->context;
/* getting here when the state is UP means that the conn is being *
* terminated asynchronously from the iSCSI layer's perspective. */
if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
ISER_CONN_TERMINATING))
iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
ISCSI_ERR_CONN_FAILED);
/* Complete the termination process if no posts are pending */
if (ib_conn->post_recv_buf_count == 0 &&
(atomic_read(&ib_conn->post_send_buf_count) == 0)) {
ib_conn->state = ISER_CONN_DOWN;
wake_up_interruptible(&ib_conn->wait);
}
ret = iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */
return ret;
}
static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
{
int ret = 0;
iser_err("event %d status %d conn %p id %p\n",
event->event, event->status, cma_id->context, cma_id);
switch (event->event) {
case RDMA_CM_EVENT_ADDR_RESOLVED:
ret = iser_addr_handler(cma_id);
break;
case RDMA_CM_EVENT_ROUTE_RESOLVED:
ret = iser_route_handler(cma_id);
break;
case RDMA_CM_EVENT_ESTABLISHED:
iser_connected_handler(cma_id);
break;
case RDMA_CM_EVENT_ADDR_ERROR:
case RDMA_CM_EVENT_ROUTE_ERROR:
case RDMA_CM_EVENT_CONNECT_ERROR:
case RDMA_CM_EVENT_UNREACHABLE:
case RDMA_CM_EVENT_REJECTED:
ret = iser_connect_error(cma_id);
break;
case RDMA_CM_EVENT_DISCONNECTED:
case RDMA_CM_EVENT_DEVICE_REMOVAL:
case RDMA_CM_EVENT_ADDR_CHANGE:
ret = iser_disconnected_handler(cma_id);
break;
default:
iser_err("Unexpected RDMA CM event (%d)\n", event->event);
break;
}
return ret;
}
void iser_conn_init(struct iser_conn *ib_conn)
{
ib_conn->state = ISER_CONN_INIT;
init_waitqueue_head(&ib_conn->wait);
ib_conn->post_recv_buf_count = 0;
atomic_set(&ib_conn->post_send_buf_count, 0);
atomic_set(&ib_conn->refcount, 1); /* ref ib conn allocation */
INIT_LIST_HEAD(&ib_conn->conn_list);
spin_lock_init(&ib_conn->lock);
}
/**
* starts the process of connecting to the target
* sleeps until the connection is established or rejected
*/
int iser_connect(struct iser_conn *ib_conn,
struct sockaddr_in *src_addr,
struct sockaddr_in *dst_addr,
int non_blocking)
{
struct sockaddr *src, *dst;
int err = 0;
sprintf(ib_conn->name, "%pI4:%d",
&dst_addr->sin_addr.s_addr, dst_addr->sin_port);
/* the device is known only --after-- address resolution */
ib_conn->device = NULL;
iser_err("connecting to: %pI4, port 0x%x\n",
&dst_addr->sin_addr, dst_addr->sin_port);
ib_conn->state = ISER_CONN_PENDING;
iser_conn_get(ib_conn); /* ref ib conn's cma id */
ib_conn->cma_id = rdma_create_id(iser_cma_handler,
(void *)ib_conn,
RDMA_PS_TCP, IB_QPT_RC);
if (IS_ERR(ib_conn->cma_id)) {
err = PTR_ERR(ib_conn->cma_id);
iser_err("rdma_create_id failed: %d\n", err);
goto id_failure;
}
src = (struct sockaddr *)src_addr;
dst = (struct sockaddr *)dst_addr;
err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000);
if (err) {
iser_err("rdma_resolve_addr failed: %d\n", err);
goto addr_failure;
}
if (!non_blocking) {
wait_event_interruptible(ib_conn->wait,
(ib_conn->state != ISER_CONN_PENDING));
if (ib_conn->state != ISER_CONN_UP) {
err = -EIO;
goto connect_failure;
}
}
mutex_lock(&ig.connlist_mutex);
list_add(&ib_conn->conn_list, &ig.connlist);
mutex_unlock(&ig.connlist_mutex);
return 0;
id_failure:
ib_conn->cma_id = NULL;
addr_failure:
ib_conn->state = ISER_CONN_DOWN;
iser_conn_put(ib_conn, 1); /* deref ib conn's cma id */
connect_failure:
iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */
return err;
}
/**
* iser_reg_page_vec - Register physical memory
*
* returns: 0 on success, errno code on failure
*/
int iser_reg_page_vec(struct iser_conn *ib_conn,
struct iser_page_vec *page_vec,
struct iser_mem_reg *mem_reg)
{
struct ib_pool_fmr *mem;
u64 io_addr;
u64 *page_list;
int status;
page_list = page_vec->pages;
io_addr = page_list[0];
mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool,
page_list,
page_vec->length,
io_addr);
if (IS_ERR(mem)) {
status = (int)PTR_ERR(mem);
iser_err("ib_fmr_pool_map_phys failed: %d\n", status);
return status;
}
mem_reg->lkey = mem->fmr->lkey;
mem_reg->rkey = mem->fmr->rkey;
mem_reg->len = page_vec->length * SIZE_4K;
mem_reg->va = io_addr;
mem_reg->is_fmr = 1;
mem_reg->mem_h = (void *)mem;
mem_reg->va += page_vec->offset;
mem_reg->len = page_vec->data_size;
iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, "
"entry[0]: (0x%08lx,%ld)] -> "
"[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n",
page_vec, page_vec->length,
(unsigned long)page_vec->pages[0],
(unsigned long)page_vec->data_size,
(unsigned int)mem_reg->lkey, mem_reg->mem_h,
(unsigned long)mem_reg->va, (unsigned long)mem_reg->len);
return 0;
}
/**
* Unregister (previosuly registered) memory.
*/
void iser_unreg_mem(struct iser_mem_reg *reg)
{
int ret;
iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h);
ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
if (ret)
iser_err("ib_fmr_pool_unmap failed %d\n", ret);
reg->mem_h = NULL;
}
int iser_post_recvl(struct iser_conn *ib_conn)
{
struct ib_recv_wr rx_wr, *rx_wr_failed;
struct ib_sge sge;
int ib_ret;
sge.addr = ib_conn->login_resp_dma;
sge.length = ISER_RX_LOGIN_SIZE;
sge.lkey = ib_conn->device->mr->lkey;
rx_wr.wr_id = (unsigned long)ib_conn->login_resp_buf;
rx_wr.sg_list = &sge;
rx_wr.num_sge = 1;
rx_wr.next = NULL;
ib_conn->post_recv_buf_count++;
ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed);
if (ib_ret) {
iser_err("ib_post_recv failed ret=%d\n", ib_ret);
ib_conn->post_recv_buf_count--;
}
return ib_ret;
}
int iser_post_recvm(struct iser_conn *ib_conn, int count)
{
struct ib_recv_wr *rx_wr, *rx_wr_failed;
int i, ib_ret;
unsigned int my_rx_head = ib_conn->rx_desc_head;
struct iser_rx_desc *rx_desc;
for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
rx_desc = &ib_conn->rx_descs[my_rx_head];
rx_wr->wr_id = (unsigned long)rx_desc;
rx_wr->sg_list = &rx_desc->rx_sg;
rx_wr->num_sge = 1;
rx_wr->next = rx_wr + 1;
my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1);
}
rx_wr--;
rx_wr->next = NULL; /* mark end of work requests list */
ib_conn->post_recv_buf_count += count;
ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed);
if (ib_ret) {
iser_err("ib_post_recv failed ret=%d\n", ib_ret);
ib_conn->post_recv_buf_count -= count;
} else
ib_conn->rx_desc_head = my_rx_head;
return ib_ret;
}
/**
* iser_start_send - Initiate a Send DTO operation
*
* returns 0 on success, -1 on failure
*/
int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc)
{
int ib_ret;
struct ib_send_wr send_wr, *send_wr_failed;
ib_dma_sync_single_for_device(ib_conn->device->ib_device,
tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
send_wr.next = NULL;
send_wr.wr_id = (unsigned long)tx_desc;
send_wr.sg_list = tx_desc->tx_sg;
send_wr.num_sge = tx_desc->num_sge;
send_wr.opcode = IB_WR_SEND;
send_wr.send_flags = IB_SEND_SIGNALED;
atomic_inc(&ib_conn->post_send_buf_count);
ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
if (ib_ret) {
iser_err("ib_post_send failed, ret:%d\n", ib_ret);
atomic_dec(&ib_conn->post_send_buf_count);
}
return ib_ret;
}
static void iser_handle_comp_error(struct iser_tx_desc *desc,
struct iser_conn *ib_conn)
{
if (desc && desc->type == ISCSI_TX_DATAOUT)
kmem_cache_free(ig.desc_cache, desc);
if (ib_conn->post_recv_buf_count == 0 &&
atomic_read(&ib_conn->post_send_buf_count) == 0) {
/* getting here when the state is UP means that the conn is *
* being terminated asynchronously from the iSCSI layer's *
* perspective. */
if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
ISER_CONN_TERMINATING))
iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
ISCSI_ERR_CONN_FAILED);
/* no more non completed posts to the QP, complete the
* termination process w.o worrying on disconnect event */
ib_conn->state = ISER_CONN_DOWN;
wake_up_interruptible(&ib_conn->wait);
}
}
static int iser_drain_tx_cq(struct iser_device *device, int cq_index)
{
struct ib_cq *cq = device->tx_cq[cq_index];
struct ib_wc wc;
struct iser_tx_desc *tx_desc;
struct iser_conn *ib_conn;
int completed_tx = 0;
while (ib_poll_cq(cq, 1, &wc) == 1) {
tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id;
ib_conn = wc.qp->qp_context;
if (wc.status == IB_WC_SUCCESS) {
if (wc.opcode == IB_WC_SEND)
iser_snd_completion(tx_desc, ib_conn);
else
iser_err("expected opcode %d got %d\n",
IB_WC_SEND, wc.opcode);
} else {
iser_err("tx id %llx status %d vend_err %x\n",
wc.wr_id, wc.status, wc.vendor_err);
atomic_dec(&ib_conn->post_send_buf_count);
iser_handle_comp_error(tx_desc, ib_conn);
}
completed_tx++;
}
return completed_tx;
}
static void iser_cq_tasklet_fn(unsigned long data)
{
struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)data;
struct iser_device *device = cq_desc->device;
int cq_index = cq_desc->cq_index;
struct ib_cq *cq = device->rx_cq[cq_index];
struct ib_wc wc;
struct iser_rx_desc *desc;
unsigned long xfer_len;
struct iser_conn *ib_conn;
int completed_tx, completed_rx;
completed_tx = completed_rx = 0;
while (ib_poll_cq(cq, 1, &wc) == 1) {
desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id;
BUG_ON(desc == NULL);
ib_conn = wc.qp->qp_context;
if (wc.status == IB_WC_SUCCESS) {
if (wc.opcode == IB_WC_RECV) {
xfer_len = (unsigned long)wc.byte_len;
iser_rcv_completion(desc, xfer_len, ib_conn);
} else
iser_err("expected opcode %d got %d\n",
IB_WC_RECV, wc.opcode);
} else {
if (wc.status != IB_WC_WR_FLUSH_ERR)
iser_err("rx id %llx status %d vend_err %x\n",
wc.wr_id, wc.status, wc.vendor_err);
ib_conn->post_recv_buf_count--;
iser_handle_comp_error(NULL, ib_conn);
}
completed_rx++;
if (!(completed_rx & 63))
completed_tx += iser_drain_tx_cq(device, cq_index);
}
/* #warning "it is assumed here that arming CQ only once its empty" *
* " would not cause interrupts to be missed" */
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
completed_tx += iser_drain_tx_cq(device, cq_index);
iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx);
}
static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
{
struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)cq_context;
struct iser_device *device = cq_desc->device;
int cq_index = cq_desc->cq_index;
tasklet_schedule(&device->cq_tasklet[cq_index]);
}