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snic: Fix for missing interrupts 

- On posting an IO to the firmware, adapter generates an interrupt.
  Due to hardware issues, sometimes the adapter fails to generate
  the interrupt. This behavior skips updating transmit queue-
  counters, which in turn causes the queue full condition. The fix
  addresses the queue full condition.

- The fix also reserves a slot in transmit queue for hba reset.
  when queue full is observed during IO, there will always be room
  to post hba reset command.

Signed-off-by: Narsimhulu Musini <nmusini@cisco.com>
Signed-off-by: Sesidhar Baddela <sebaddel@cisco.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Narsimhulu Musini 2016-03-17 00:51:14 -07:00 committed by Martin K. Petersen
parent 58fcf92050
commit c9747821f9
2 changed files with 60 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/scsi/snic/snic_fwint.h
View File

@ -414,7 +414,7 @@ enum snic_ev_type {
/* Payload 88 bytes = 128 - 24 - 16 */
#define SNIC_HOST_REQ_PAYLOAD ((int)(SNIC_HOST_REQ_LEN - \
sizeof(struct snic_io_hdr) - \
(2 * sizeof(u64))))
(2 * sizeof(u64)) - sizeof(ulong)))
/*
* snic_host_req: host -> firmware request
@ -448,6 +448,8 @@ struct snic_host_req {
/* hba reset */
struct snic_hba_reset reset;
} u;
ulong req_pa;
}; /* end of snic_host_req structure */

64
drivers/scsi/snic/snic_io.c
View File

@ -48,7 +48,7 @@ snic_wq_cmpl_frame_send(struct vnic_wq *wq,
SNIC_TRC(snic->shost->host_no, 0, 0,
((ulong)(buf->os_buf) - sizeof(struct snic_req_info)), 0, 0,
0);
pci_unmap_single(snic->pdev, buf->dma_addr, buf->len, PCI_DMA_TODEVICE);
buf->os_buf = NULL;
}
@ -137,13 +137,36 @@ snic_select_wq(struct snic *snic)
return 0;
}
static int
snic_wqdesc_avail(struct snic *snic, int q_num, int req_type)
{
int nr_wqdesc = snic->config.wq_enet_desc_count;
if (q_num > 0) {
/*
* Multi Queue case, additional care is required.
* Per WQ active requests need to be maintained.
*/
SNIC_HOST_INFO(snic->shost, "desc_avail: Multi Queue case.\n");
SNIC_BUG_ON(q_num > 0);
return -1;
}
nr_wqdesc -= atomic64_read(&snic->s_stats.fw.actv_reqs);
return ((req_type == SNIC_REQ_HBA_RESET) ? nr_wqdesc : nr_wqdesc - 1);
}
int
snic_queue_wq_desc(struct snic *snic, void *os_buf, u16 len)
{
dma_addr_t pa = 0;
unsigned long flags;
struct snic_fw_stats *fwstats = &snic->s_stats.fw;
struct snic_host_req *req = (struct snic_host_req *) os_buf;
long act_reqs;
long desc_avail = 0;
int q_num = 0;
snic_print_desc(__func__, os_buf, len);
@ -156,11 +179,15 @@ snic_queue_wq_desc(struct snic *snic, void *os_buf, u16 len)
return -ENOMEM;
}
req->req_pa = (ulong)pa;
q_num = snic_select_wq(snic);
spin_lock_irqsave(&snic->wq_lock[q_num], flags);
if (!svnic_wq_desc_avail(snic->wq)) {
desc_avail = snic_wqdesc_avail(snic, q_num, req->hdr.type);
if (desc_avail <= 0) {
pci_unmap_single(snic->pdev, pa, len, PCI_DMA_TODEVICE);
req->req_pa = 0;
spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
atomic64_inc(&snic->s_stats.misc.wq_alloc_fail);
SNIC_DBG("host = %d, WQ is Full\n", snic->shost->host_no);
@ -169,10 +196,13 @@ snic_queue_wq_desc(struct snic *snic, void *os_buf, u16 len)
}
snic_queue_wq_eth_desc(&snic->wq[q_num], os_buf, pa, len, 0, 0, 1);
/*
* Update stats
* note: when multi queue enabled, fw actv_reqs should be per queue.
*/
act_reqs = atomic64_inc_return(&fwstats->actv_reqs);
spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
/* Update stats */
act_reqs = atomic64_inc_return(&fwstats->actv_reqs);
if (act_reqs > atomic64_read(&fwstats->max_actv_reqs))
atomic64_set(&fwstats->max_actv_reqs, act_reqs);
@ -318,11 +348,31 @@ snic_req_free(struct snic *snic, struct snic_req_info *rqi)
"Req_free:rqi %p:ioreq %p:abt %p:dr %p\n",
rqi, rqi->req, rqi->abort_req, rqi->dr_req);
if (rqi->abort_req)
mempool_free(rqi->abort_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
if (rqi->abort_req) {
if (rqi->abort_req->req_pa)
pci_unmap_single(snic->pdev,
rqi->abort_req->req_pa,
sizeof(struct snic_host_req),
PCI_DMA_TODEVICE);
mempool_free(rqi->abort_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
}
if (rqi->dr_req) {
if (rqi->dr_req->req_pa)
pci_unmap_single(snic->pdev,
rqi->dr_req->req_pa,
sizeof(struct snic_host_req),
PCI_DMA_TODEVICE);
if (rqi->dr_req)
mempool_free(rqi->dr_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
}
if (rqi->req->req_pa)
pci_unmap_single(snic->pdev,
rqi->req->req_pa,
rqi->req_len,
PCI_DMA_TODEVICE);
mempool_free(rqi, snic->req_pool[rqi->rq_pool_type]);
}