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scsi: lpfc: Added recovery logic for running out of NVMET IO context resources

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Previous logic would just drop the IO.

Added logic to queue the IO to wait for an IO context resource from an
IO thats already in progress.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart
2017-05-15 15:20:46 -07:00
committed by Martin K. Petersen
parent 6c621a2229
commit a8cf5dfeb4
8 changed files with 144 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

138
drivers/scsi/lpfc/lpfc_nvmet.c
View File

@@ -158,6 +158,12 @@ void
lpfc_nvmet_ctxbuf_post(struct lpfc_hba *phba, struct lpfc_nvmet_ctxbuf *ctx_buf)
{
struct lpfc_nvmet_rcv_ctx *ctxp = ctx_buf->context;
struct lpfc_nvmet_tgtport *tgtp;
struct fc_frame_header *fc_hdr;
struct rqb_dmabuf *nvmebuf;
struct lpfc_dmabuf *hbufp;
uint32_t *payload;
uint32_t size, oxid, sid, rc;
unsigned long iflag;
if (ctxp->txrdy) {
@@ -168,6 +174,87 @@ lpfc_nvmet_ctxbuf_post(struct lpfc_hba *phba, struct lpfc_nvmet_ctxbuf *ctx_buf)
}
ctxp->state = LPFC_NVMET_STE_FREE;
spin_lock_irqsave(&phba->sli4_hba.nvmet_io_wait_lock, iflag);
if (phba->sli4_hba.nvmet_io_wait_cnt) {
hbufp = &nvmebuf->hbuf;
list_remove_head(&phba->sli4_hba.lpfc_nvmet_io_wait_list,
nvmebuf, struct rqb_dmabuf,
hbuf.list);
phba->sli4_hba.nvmet_io_wait_cnt--;
spin_unlock_irqrestore(&phba->sli4_hba.nvmet_io_wait_lock,
iflag);
fc_hdr = (struct fc_frame_header *)(nvmebuf->hbuf.virt);
oxid = be16_to_cpu(fc_hdr->fh_ox_id);
tgtp = (struct lpfc_nvmet_tgtport *)phba->targetport->private;
payload = (uint32_t *)(nvmebuf->dbuf.virt);
size = nvmebuf->bytes_recv;
sid = sli4_sid_from_fc_hdr(fc_hdr);
ctxp = (struct lpfc_nvmet_rcv_ctx *)ctx_buf->context;
memset(ctxp, 0, sizeof(ctxp->ctx));
ctxp->wqeq = NULL;
ctxp->txrdy = NULL;
ctxp->offset = 0;
ctxp->phba = phba;
ctxp->size = size;
ctxp->oxid = oxid;
ctxp->sid = sid;
ctxp->state = LPFC_NVMET_STE_RCV;
ctxp->entry_cnt = 1;
ctxp->flag = 0;
ctxp->ctxbuf = ctx_buf;
spin_lock_init(&ctxp->ctxlock);
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
if (phba->ktime_on) {
ctxp->ts_cmd_nvme = ktime_get_ns();
ctxp->ts_isr_cmd = ctxp->ts_cmd_nvme;
ctxp->ts_nvme_data = 0;
ctxp->ts_data_wqput = 0;
ctxp->ts_isr_data = 0;
ctxp->ts_data_nvme = 0;
ctxp->ts_nvme_status = 0;
ctxp->ts_status_wqput = 0;
ctxp->ts_isr_status = 0;
ctxp->ts_status_nvme = 0;
}
#endif
atomic_inc(&tgtp->rcv_fcp_cmd_in);
/*
* The calling sequence should be:
* nvmet_fc_rcv_fcp_req->lpfc_nvmet_xmt_fcp_op/cmp- req->done
* lpfc_nvmet_xmt_fcp_op_cmp should free the allocated ctxp.
* When we return from nvmet_fc_rcv_fcp_req, all relevant info
* the NVME command / FC header is stored.
* A buffer has already been reposted for this IO, so just free
* the nvmebuf.
*/
rc = nvmet_fc_rcv_fcp_req(phba->targetport, &ctxp->ctx.fcp_req,
payload, size);
/* Process FCP command */
if (rc == 0) {
atomic_inc(&tgtp->rcv_fcp_cmd_out);
nvmebuf->hrq->rqbp->rqb_free_buffer(phba, nvmebuf);
return;
}
atomic_inc(&tgtp->rcv_fcp_cmd_drop);
lpfc_printf_log(phba, KERN_ERR, LOG_NVME_IOERR,
"2582 FCP Drop IO x%x: err x%x: x%x x%x x%x\n",
ctxp->oxid, rc,
atomic_read(&tgtp->rcv_fcp_cmd_in),
atomic_read(&tgtp->rcv_fcp_cmd_out),
atomic_read(&tgtp->xmt_fcp_release));
lpfc_nvmet_defer_release(phba, ctxp);
lpfc_nvmet_unsol_fcp_issue_abort(phba, ctxp, sid, oxid);
nvmebuf->hrq->rqbp->rqb_free_buffer(phba, nvmebuf);
return;
}
spin_unlock_irqrestore(&phba->sli4_hba.nvmet_io_wait_lock, iflag);
spin_lock_irqsave(&phba->sli4_hba.nvmet_io_lock, iflag);
list_add_tail(&ctx_buf->list,
&phba->sli4_hba.lpfc_nvmet_ctx_list);
@@ -1232,7 +1319,7 @@ lpfc_nvmet_unsol_fcp_buffer(struct lpfc_hba *phba,
struct fc_frame_header *fc_hdr;
struct lpfc_nvmet_ctxbuf *ctx_buf;
uint32_t *payload;
uint32_t size, oxid, sid, rc;
uint32_t size, oxid, sid, rc, qno;
unsigned long iflag;
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
uint32_t id;
@@ -1257,21 +1344,41 @@ lpfc_nvmet_unsol_fcp_buffer(struct lpfc_hba *phba,
}
spin_unlock_irqrestore(&phba->sli4_hba.nvmet_io_lock, iflag);
fc_hdr = (struct fc_frame_header *)(nvmebuf->hbuf.virt);
oxid = be16_to_cpu(fc_hdr->fh_ox_id);
size = nvmebuf->bytes_recv;
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
if (phba->cpucheck_on & LPFC_CHECK_NVMET_RCV) {
id = smp_processor_id();
if (id < LPFC_CHECK_CPU_CNT)
phba->cpucheck_rcv_io[id]++;
}
#endif
lpfc_nvmeio_data(phba, "NVMET FCP RCV: xri x%x sz %d CPU %02x\n",
oxid, size, smp_processor_id());
if (!ctx_buf) {
lpfc_printf_log(phba, KERN_ERR, LOG_NVME_IOERR,
"6408 No NVMET ctx Drop IO\n");
oxid = 0;
size = 0;
sid = 0;
ctxp = NULL;
goto dropit;
/* Queue this NVME IO to process later */
spin_lock_irqsave(&phba->sli4_hba.nvmet_io_wait_lock, iflag);
list_add_tail(&nvmebuf->hbuf.list,
&phba->sli4_hba.lpfc_nvmet_io_wait_list);
phba->sli4_hba.nvmet_io_wait_cnt++;
phba->sli4_hba.nvmet_io_wait_total++;
spin_unlock_irqrestore(&phba->sli4_hba.nvmet_io_wait_lock,
iflag);
/* Post a brand new DMA buffer to RQ */
qno = nvmebuf->idx;
lpfc_post_rq_buffer(
phba, phba->sli4_hba.nvmet_mrq_hdr[qno],
phba->sli4_hba.nvmet_mrq_data[qno], 1, qno);
return;
}
tgtp = (struct lpfc_nvmet_tgtport *)phba->targetport->private;
payload = (uint32_t *)(nvmebuf->dbuf.virt);
fc_hdr = (struct fc_frame_header *)(nvmebuf->hbuf.virt);
size = nvmebuf->bytes_recv;
oxid = be16_to_cpu(fc_hdr->fh_ox_id);
sid = sli4_sid_from_fc_hdr(fc_hdr);
ctxp = (struct lpfc_nvmet_rcv_ctx *)ctx_buf->context;
@@ -1302,17 +1409,8 @@ lpfc_nvmet_unsol_fcp_buffer(struct lpfc_hba *phba,
ctxp->ts_isr_status = 0;
ctxp->ts_status_nvme = 0;
}
if (phba->cpucheck_on & LPFC_CHECK_NVMET_RCV) {
id = smp_processor_id();
if (id < LPFC_CHECK_CPU_CNT)
phba->cpucheck_rcv_io[id]++;
}
#endif
lpfc_nvmeio_data(phba, "NVMET FCP RCV: xri x%x sz %d CPU %02x\n",
oxid, size, smp_processor_id());
atomic_inc(&tgtp->rcv_fcp_cmd_in);
/*
* The calling sequence should be: