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authorNarsimhulu Musini <nmusini@cisco.com>2016-03-17 08:51:14 +0100
committerMartin K. Petersen <martin.petersen@oracle.com>2016-04-11 22:57:09 +0200
commitc9747821f9bbff6c07fa36087b003d89d05245c8 (patch)
treee471ac763c1793a5fd14e80617fdfe4dad91f695 /drivers/scsi/snic/snic_io.c
parentsnic: target cleanup in driver unload path (diff)
downloadlinux-c9747821f9bbff6c07fa36087b003d89d05245c8.tar.xz
linux-c9747821f9bbff6c07fa36087b003d89d05245c8.zip
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>
Diffstat (limited to 'drivers/scsi/snic/snic_io.c')
-rw-r--r--drivers/scsi/snic/snic_io.c62
1 files changed, 56 insertions, 6 deletions
diff --git a/drivers/scsi/snic/snic_io.c b/drivers/scsi/snic/snic_io.c
index 993db7de4e4b..8e69548395b9 100644
--- a/drivers/scsi/snic/snic_io.c
+++ b/drivers/scsi/snic/snic_io.c
@@ -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)
+ 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]);
}