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Merge branch 'ibmvnic-Fix-driver-reset-and-DMA-bugs'

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Thomas Falcon says:

====================
ibmvnic: Fix driver reset and DMA bugs

This patch series introduces some fixes to the driver reset
routines and a patch that fixes mistakes caught by the kernel
DMA debugger.

The reset fixes include a fix to reset TX queue counters properly
after a reset as well as updates to driver reset error-handling code.
It also provides updates to the reset handling routine for redundant
backing VF failover and partition migration cases.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-04-08 12:39:47 -04:00
commit 4e31a6845f
2 changed files with 98 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

146
drivers/net/ethernet/ibm/ibmvnic.c
View File

@ -118,6 +118,7 @@ static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
static int ibmvnic_init(struct ibmvnic_adapter *);
static void release_crq_queue(struct ibmvnic_adapter *);
static int __ibmvnic_set_mac(struct net_device *netdev, struct sockaddr *p);
static int init_crq_queue(struct ibmvnic_adapter *adapter);
struct ibmvnic_stat {
char name[ETH_GSTRING_LEN];
@ -320,18 +321,16 @@ failure:
dev_info(dev, "replenish pools failure\n");
pool->free_map[pool->next_free] = index;
pool->rx_buff[index].skb = NULL;
if (!dma_mapping_error(dev, dma_addr))
dma_unmap_single(dev, dma_addr, pool->buff_size,
DMA_FROM_DEVICE);
dev_kfree_skb_any(skb);
adapter->replenish_add_buff_failure++;
atomic_add(buffers_added, &pool->available);
if (lpar_rc == H_CLOSED) {
if (lpar_rc == H_CLOSED || adapter->failover_pending) {
/* Disable buffer pool replenishment and report carrier off if
* queue is closed. Firmware guarantees that a signal will
* be sent to the driver, triggering a reset.
* 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);
@ -1071,6 +1070,14 @@ static int ibmvnic_open(struct net_device *netdev)
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int rc;
/* 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_OPEN;
return 0;
}
mutex_lock(&adapter->reset_lock);
if (adapter->state != VNIC_CLOSED) {
@ -1218,7 +1225,6 @@ static int __ibmvnic_close(struct net_device *netdev)
rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
if (rc)
return rc;
ibmvnic_cleanup(netdev);
adapter->state = VNIC_CLOSED;
return 0;
}
@ -1228,8 +1234,17 @@ static int ibmvnic_close(struct net_device *netdev)
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
int rc;
/* 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;
}
mutex_lock(&adapter->reset_lock);
rc = __ibmvnic_close(netdev);
ibmvnic_cleanup(netdev);
mutex_unlock(&adapter->reset_lock);
return rc;
@ -1562,8 +1577,9 @@ static int ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
dev_kfree_skb_any(skb);
tx_buff->skb = NULL;
if (lpar_rc == H_CLOSED) {
/* Disable TX and report carrier off if queue is closed.
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.
*/
@ -1711,14 +1727,10 @@ static int do_reset(struct ibmvnic_adapter *adapter,
old_num_rx_queues = adapter->req_rx_queues;
old_num_tx_queues = adapter->req_tx_queues;
if (rwi->reset_reason == VNIC_RESET_MOBILITY) {
rc = ibmvnic_reenable_crq_queue(adapter);
if (rc)
return 0;
ibmvnic_cleanup(netdev);
} else if (rwi->reset_reason == VNIC_RESET_FAILOVER) {
ibmvnic_cleanup(netdev);
} else {
ibmvnic_cleanup(netdev);
if (adapter->reset_reason != VNIC_RESET_MOBILITY &&
adapter->reset_reason != VNIC_RESET_FAILOVER) {
rc = __ibmvnic_close(netdev);
if (rc)
return rc;
@ -1737,6 +1749,23 @@ static int do_reset(struct ibmvnic_adapter *adapter,
*/
adapter->state = VNIC_PROBED;
if (adapter->wait_for_reset) {
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)
rc = vio_enable_interrupts(adapter->vdev);
}
if (rc) {
netdev_err(adapter->netdev,
"Couldn't initialize crq. rc=%d\n", rc);
return rc;
}
rc = ibmvnic_init(adapter);
if (rc)
return IBMVNIC_INIT_FAILED;
@ -1878,23 +1907,26 @@ static void __ibmvnic_reset(struct work_struct *work)
mutex_unlock(&adapter->reset_lock);
}
static void ibmvnic_reset(struct ibmvnic_adapter *adapter,
enum ibmvnic_reset_reason reason)
static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
enum ibmvnic_reset_reason reason)
{
struct ibmvnic_rwi *rwi, *tmp;
struct net_device *netdev = adapter->netdev;
struct list_head *entry;
int ret;
if (adapter->state == VNIC_REMOVING ||
adapter->state == VNIC_REMOVED) {
netdev_dbg(netdev, "Adapter removing, skipping reset\n");
return;
adapter->state == VNIC_REMOVED ||
adapter->failover_pending) {
ret = EBUSY;
netdev_dbg(netdev, "Adapter removing or pending failover, skipping reset\n");
goto err;
}
if (adapter->state == VNIC_PROBING) {
netdev_warn(netdev, "Adapter reset during probe\n");
adapter->init_done_rc = EAGAIN;
return;
ret = adapter->init_done_rc = EAGAIN;
goto err;
}
mutex_lock(&adapter->rwi_lock);
@ -1904,7 +1936,8 @@ static void ibmvnic_reset(struct ibmvnic_adapter *adapter,
if (tmp->reset_reason == reason) {
netdev_dbg(netdev, "Skipping matching reset\n");
mutex_unlock(&adapter->rwi_lock);
return;
ret = EBUSY;
goto err;
}
}
@ -1912,7 +1945,8 @@ static void ibmvnic_reset(struct ibmvnic_adapter *adapter,
if (!rwi) {
mutex_unlock(&adapter->rwi_lock);
ibmvnic_close(netdev);
return;
ret = ENOMEM;
goto err;
}
rwi->reset_reason = reason;
@ -1921,6 +1955,12 @@ static void ibmvnic_reset(struct ibmvnic_adapter *adapter,
netdev_dbg(adapter->netdev, "Scheduling reset (reason %d)\n", reason);
schedule_work(&adapter->ibmvnic_reset);
return 0;
err:
if (adapter->wait_for_reset)
adapter->wait_for_reset = false;
return -ret;
}
static void ibmvnic_tx_timeout(struct net_device *dev)
@ -2055,6 +2095,8 @@ static void ibmvnic_netpoll_controller(struct net_device *dev)
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;
@ -2062,11 +2104,15 @@ static int wait_for_reset(struct ibmvnic_adapter *adapter)
adapter->fallback.tx_entries = adapter->req_tx_entries_per_subcrq;
init_completion(&adapter->reset_done);
ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
adapter->wait_for_reset = true;
rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
if (rc)
return rc;
wait_for_completion(&adapter->reset_done);
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;
@ -2074,12 +2120,15 @@ static int wait_for_reset(struct ibmvnic_adapter *adapter)
adapter->desired.tx_entries = adapter->fallback.tx_entries;
init_completion(&adapter->reset_done);
ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
adapter->wait_for_reset = true;
rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
if (rc)
return ret;
wait_for_completion(&adapter->reset_done);
}
adapter->wait_for_reset = false;
return adapter->reset_done_rc;
return ret;
}
static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu)
@ -2364,6 +2413,7 @@ static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
}
memset(scrq->msgs, 0, 4 * PAGE_SIZE);
atomic_set(&scrq->used, 0);
scrq->cur = 0;
rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
@ -2574,7 +2624,7 @@ static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
union sub_crq *next;
int index;
int i, j;
u8 first;
u8 *first;
restart_loop:
while (pending_scrq(adapter, scrq)) {
@ -2605,11 +2655,12 @@ restart_loop:
txbuff->data_dma[j] = 0;
}
/* if sub_crq was sent indirectly */
first = txbuff->indir_arr[0].generic.first;
if (first == IBMVNIC_CRQ_CMD) {
first = &txbuff->indir_arr[0].generic.first;
if (*first == IBMVNIC_CRQ_CMD) {
dma_unmap_single(dev, txbuff->indir_dma,
sizeof(txbuff->indir_arr),
DMA_TO_DEVICE);
*first = 0;
}
if (txbuff->last_frag) {
@ -3882,9 +3933,9 @@ static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
int i;
dma_unmap_single(dev, adapter->login_buf_token, adapter->login_buf_sz,
DMA_BIDIRECTIONAL);
DMA_TO_DEVICE);
dma_unmap_single(dev, adapter->login_rsp_buf_token,
adapter->login_rsp_buf_sz, DMA_BIDIRECTIONAL);
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
@ -4144,7 +4195,9 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
case IBMVNIC_CRQ_INIT:
dev_info(dev, "Partner initialized\n");
adapter->from_passive_init = true;
adapter->failover_pending = false;
complete(&adapter->init_done);
ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
break;
case IBMVNIC_CRQ_INIT_COMPLETE:
dev_info(dev, "Partner initialization complete\n");
@ -4161,7 +4214,7 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
ibmvnic_reset(adapter, VNIC_RESET_MOBILITY);
} else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) {
dev_info(dev, "Backing device failover detected\n");
ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
adapter->failover_pending = true;
} else {
/* The adapter lost the connection */
dev_err(dev, "Virtual Adapter failed (rc=%d)\n",
@ -4461,19 +4514,6 @@ static int ibmvnic_init(struct ibmvnic_adapter *adapter)
u64 old_num_rx_queues, old_num_tx_queues;
int rc;
if (adapter->resetting && !adapter->wait_for_reset) {
rc = ibmvnic_reset_crq(adapter);
if (!rc)
rc = vio_enable_interrupts(adapter->vdev);
} else {
rc = init_crq_queue(adapter);
}
if (rc) {
dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
return rc;
}
adapter->from_passive_init = false;
old_num_rx_queues = adapter->req_rx_queues;
@ -4498,7 +4538,8 @@ static int ibmvnic_init(struct ibmvnic_adapter *adapter)
return -1;
}
if (adapter->resetting && !adapter->wait_for_reset) {
if (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);
@ -4586,6 +4627,13 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
adapter->mac_change_pending = false;
do {
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_init(adapter);
if (rc && rc != EAGAIN)
goto ibmvnic_init_fail;

1
drivers/net/ethernet/ibm/ibmvnic.h
View File

@ -1108,6 +1108,7 @@ struct ibmvnic_adapter {
bool napi_enabled, from_passive_init;
bool mac_change_pending;
bool failover_pending;
struct ibmvnic_tunables desired;
struct ibmvnic_tunables fallback;