From cf1a1d3e2d88af49472014db0c82779b4fe85455 Mon Sep 17 00:00:00 2001 From: James Smart Date: Fri, 8 Dec 2017 17:18:03 -0800 Subject: [PATCH] scsi: lpfc: Fix random heartbeat timeouts during heavy IO NVME targets appear to randomly disconnect from the initiator when running heavy IO. The error is due to the host aggregate (across all controllers) io load was beyond the maximum exchange count for nvme on the adapter. The driver was properly returning a resource busy status, but the io load was so great heartbeat commands would be bounced and not have a successful retry within the fuzz amount for the nvme heartbeat (yes, a very high io load!). Thus the target was terminating the controller due to a keep alive failure. Resolve by reserving a few exchanges (by counters) which can be used when the adapter is out of normal exchanges and the command is a NVME heartbeat command. As counters are used, while the reserved command is outstanding, as soon as any other exchange completes, the counters are adjusted and the reserved count is replenished. The heartbeat completes execution in a normal fashion. Signed-off-by: Dick Kennedy Signed-off-by: James Smart Reviewed-by: Hannes Reinecke Signed-off-by: Martin K. Petersen --- drivers/scsi/lpfc/lpfc.h | 2 ++ drivers/scsi/lpfc/lpfc_init.c | 16 ++++++++++- drivers/scsi/lpfc/lpfc_nvme.c | 66 +++++++++++++++++++++++++++++-------------- drivers/scsi/lpfc/lpfc_nvme.h | 1 + 4 files changed, 63 insertions(+), 22 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h index dd2191c..61fb46d 100644 --- a/drivers/scsi/lpfc/lpfc.h +++ b/drivers/scsi/lpfc/lpfc.h @@ -945,6 +945,8 @@ struct lpfc_hba { struct list_head lpfc_nvme_buf_list_get; struct list_head lpfc_nvme_buf_list_put; uint32_t total_nvme_bufs; + uint32_t get_nvme_bufs; + uint32_t put_nvme_bufs; struct list_head lpfc_iocb_list; uint32_t total_iocbq_bufs; struct list_head active_rrq_list; diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index fa21155..44a98bc 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -1034,6 +1034,7 @@ lpfc_hba_down_post_s4(struct lpfc_hba *phba) LIST_HEAD(nvmet_aborts); unsigned long iflag = 0; struct lpfc_sglq *sglq_entry = NULL; + int cnt; lpfc_sli_hbqbuf_free_all(phba); @@ -1090,11 +1091,14 @@ lpfc_hba_down_post_s4(struct lpfc_hba *phba) spin_unlock_irqrestore(&phba->scsi_buf_list_put_lock, iflag); if (phba->cfg_enable_fc4_type & LPFC_ENABLE_NVME) { + cnt = 0; list_for_each_entry_safe(psb, psb_next, &nvme_aborts, list) { psb->pCmd = NULL; psb->status = IOSTAT_SUCCESS; + cnt++; } spin_lock_irqsave(&phba->nvme_buf_list_put_lock, iflag); + phba->put_nvme_bufs += cnt; list_splice(&nvme_aborts, &phba->lpfc_nvme_buf_list_put); spin_unlock_irqrestore(&phba->nvme_buf_list_put_lock, iflag); @@ -3339,6 +3343,7 @@ lpfc_nvme_free(struct lpfc_hba *phba) list_for_each_entry_safe(lpfc_ncmd, lpfc_ncmd_next, &phba->lpfc_nvme_buf_list_put, list) { list_del(&lpfc_ncmd->list); + phba->put_nvme_bufs--; dma_pool_free(phba->lpfc_sg_dma_buf_pool, lpfc_ncmd->data, lpfc_ncmd->dma_handle); kfree(lpfc_ncmd); @@ -3350,6 +3355,7 @@ lpfc_nvme_free(struct lpfc_hba *phba) list_for_each_entry_safe(lpfc_ncmd, lpfc_ncmd_next, &phba->lpfc_nvme_buf_list_get, list) { list_del(&lpfc_ncmd->list); + phba->get_nvme_bufs--; dma_pool_free(phba->lpfc_sg_dma_buf_pool, lpfc_ncmd->data, lpfc_ncmd->dma_handle); kfree(lpfc_ncmd); @@ -3754,9 +3760,11 @@ lpfc_sli4_nvme_sgl_update(struct lpfc_hba *phba) uint16_t i, lxri, els_xri_cnt; uint16_t nvme_xri_cnt, nvme_xri_max; LIST_HEAD(nvme_sgl_list); - int rc; + int rc, cnt; phba->total_nvme_bufs = 0; + phba->get_nvme_bufs = 0; + phba->put_nvme_bufs = 0; if (!(phba->cfg_enable_fc4_type & LPFC_ENABLE_NVME)) return 0; @@ -3780,6 +3788,9 @@ lpfc_sli4_nvme_sgl_update(struct lpfc_hba *phba) spin_lock(&phba->nvme_buf_list_put_lock); list_splice_init(&phba->lpfc_nvme_buf_list_get, &nvme_sgl_list); list_splice(&phba->lpfc_nvme_buf_list_put, &nvme_sgl_list); + cnt = phba->get_nvme_bufs + phba->put_nvme_bufs; + phba->get_nvme_bufs = 0; + phba->put_nvme_bufs = 0; spin_unlock(&phba->nvme_buf_list_put_lock); spin_unlock_irq(&phba->nvme_buf_list_get_lock); @@ -3824,6 +3835,7 @@ lpfc_sli4_nvme_sgl_update(struct lpfc_hba *phba) spin_lock_irq(&phba->nvme_buf_list_get_lock); spin_lock(&phba->nvme_buf_list_put_lock); list_splice_init(&nvme_sgl_list, &phba->lpfc_nvme_buf_list_get); + phba->get_nvme_bufs = cnt; INIT_LIST_HEAD(&phba->lpfc_nvme_buf_list_put); spin_unlock(&phba->nvme_buf_list_put_lock); spin_unlock_irq(&phba->nvme_buf_list_get_lock); @@ -5609,8 +5621,10 @@ lpfc_setup_driver_resource_phase1(struct lpfc_hba *phba) /* Initialize the NVME buffer list used by driver for NVME IO */ spin_lock_init(&phba->nvme_buf_list_get_lock); INIT_LIST_HEAD(&phba->lpfc_nvme_buf_list_get); + phba->get_nvme_bufs = 0; spin_lock_init(&phba->nvme_buf_list_put_lock); INIT_LIST_HEAD(&phba->lpfc_nvme_buf_list_put); + phba->put_nvme_bufs = 0; } /* Initialize the fabric iocb list */ diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c index c9945ed..1097ca5 100644 --- a/drivers/scsi/lpfc/lpfc_nvme.c +++ b/drivers/scsi/lpfc/lpfc_nvme.c @@ -57,7 +57,8 @@ /* NVME initiator-based functions */ static struct lpfc_nvme_buf * -lpfc_get_nvme_buf(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp); +lpfc_get_nvme_buf(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp, + int expedite); static void lpfc_release_nvme_buf(struct lpfc_hba *, struct lpfc_nvme_buf *); @@ -1265,6 +1266,7 @@ lpfc_nvme_fcp_io_submit(struct nvme_fc_local_port *pnvme_lport, struct nvmefc_fcp_req *pnvme_fcreq) { int ret = 0; + int expedite = 0; struct lpfc_nvme_lport *lport; struct lpfc_vport *vport; struct lpfc_hba *phba; @@ -1273,6 +1275,7 @@ lpfc_nvme_fcp_io_submit(struct nvme_fc_local_port *pnvme_lport, struct lpfc_nvme_rport *rport; struct lpfc_nvme_qhandle *lpfc_queue_info; struct lpfc_nvme_fcpreq_priv *freqpriv; + struct nvme_common_command *sqe; #ifdef CONFIG_SCSI_LPFC_DEBUG_FS uint64_t start = 0; #endif @@ -1354,15 +1357,27 @@ lpfc_nvme_fcp_io_submit(struct nvme_fc_local_port *pnvme_lport, } + /* Currently only NVME Keep alive commands should be expedited + * if the driver runs out of a resource. These should only be + * issued on the admin queue, qidx 0 + */ + if (!lpfc_queue_info->qidx && !pnvme_fcreq->sg_cnt) { + sqe = &((struct nvme_fc_cmd_iu *) + pnvme_fcreq->cmdaddr)->sqe.common; + if (sqe->opcode == nvme_admin_keep_alive) + expedite = 1; + } + /* The node is shared with FCP IO, make sure the IO pending count does * not exceed the programmed depth. */ - if (atomic_read(&ndlp->cmd_pending) >= ndlp->cmd_qdepth) { + if ((atomic_read(&ndlp->cmd_pending) >= ndlp->cmd_qdepth) && + !expedite) { ret = -EBUSY; goto out_fail; } - lpfc_ncmd = lpfc_get_nvme_buf(phba, ndlp); + lpfc_ncmd = lpfc_get_nvme_buf(phba, ndlp, expedite); if (lpfc_ncmd == NULL) { lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR, "6065 driver's buffer pool is empty, " @@ -1991,6 +2006,8 @@ lpfc_repost_nvme_sgl_list(struct lpfc_hba *phba) spin_lock(&phba->nvme_buf_list_put_lock); list_splice_init(&phba->lpfc_nvme_buf_list_get, &post_nblist); list_splice(&phba->lpfc_nvme_buf_list_put, &post_nblist); + phba->get_nvme_bufs = 0; + phba->put_nvme_bufs = 0; spin_unlock(&phba->nvme_buf_list_put_lock); spin_unlock_irq(&phba->nvme_buf_list_get_lock); @@ -2127,6 +2144,20 @@ lpfc_new_nvme_buf(struct lpfc_vport *vport, int num_to_alloc) return num_posted; } +static inline struct lpfc_nvme_buf * +lpfc_nvme_buf(struct lpfc_hba *phba) +{ + struct lpfc_nvme_buf *lpfc_ncmd, *lpfc_ncmd_next; + + list_for_each_entry_safe(lpfc_ncmd, lpfc_ncmd_next, + &phba->lpfc_nvme_buf_list_get, list) { + list_del_init(&lpfc_ncmd->list); + phba->get_nvme_bufs--; + return lpfc_ncmd; + } + return NULL; +} + /** * lpfc_get_nvme_buf - Get a nvme buffer from lpfc_nvme_buf_list of the HBA * @phba: The HBA for which this call is being executed. @@ -2139,35 +2170,27 @@ lpfc_new_nvme_buf(struct lpfc_vport *vport, int num_to_alloc) * Pointer to lpfc_nvme_buf - Success **/ static struct lpfc_nvme_buf * -lpfc_get_nvme_buf(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp) +lpfc_get_nvme_buf(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp, + int expedite) { - struct lpfc_nvme_buf *lpfc_ncmd, *lpfc_ncmd_next; + struct lpfc_nvme_buf *lpfc_ncmd = NULL; unsigned long iflag = 0; - int found = 0; spin_lock_irqsave(&phba->nvme_buf_list_get_lock, iflag); - list_for_each_entry_safe(lpfc_ncmd, lpfc_ncmd_next, - &phba->lpfc_nvme_buf_list_get, list) { - list_del_init(&lpfc_ncmd->list); - found = 1; - break; - } - if (!found) { + if (phba->get_nvme_bufs > LPFC_NVME_EXPEDITE_XRICNT || expedite) + lpfc_ncmd = lpfc_nvme_buf(phba); + if (!lpfc_ncmd) { spin_lock(&phba->nvme_buf_list_put_lock); list_splice(&phba->lpfc_nvme_buf_list_put, &phba->lpfc_nvme_buf_list_get); + phba->get_nvme_bufs += phba->put_nvme_bufs; INIT_LIST_HEAD(&phba->lpfc_nvme_buf_list_put); + phba->put_nvme_bufs = 0; spin_unlock(&phba->nvme_buf_list_put_lock); - list_for_each_entry_safe(lpfc_ncmd, lpfc_ncmd_next, - &phba->lpfc_nvme_buf_list_get, list) { - list_del_init(&lpfc_ncmd->list); - found = 1; - break; - } + if (phba->get_nvme_bufs > LPFC_NVME_EXPEDITE_XRICNT || expedite) + lpfc_ncmd = lpfc_nvme_buf(phba); } spin_unlock_irqrestore(&phba->nvme_buf_list_get_lock, iflag); - if (!found) - return NULL; return lpfc_ncmd; } @@ -2205,6 +2228,7 @@ lpfc_release_nvme_buf(struct lpfc_hba *phba, struct lpfc_nvme_buf *lpfc_ncmd) lpfc_ncmd->cur_iocbq.iocb_flag = LPFC_IO_NVME; spin_lock_irqsave(&phba->nvme_buf_list_put_lock, iflag); list_add_tail(&lpfc_ncmd->list, &phba->lpfc_nvme_buf_list_put); + phba->put_nvme_bufs++; spin_unlock_irqrestore(&phba->nvme_buf_list_put_lock, iflag); } } diff --git a/drivers/scsi/lpfc/lpfc_nvme.h b/drivers/scsi/lpfc/lpfc_nvme.h index 903ec37..c0833e4 100644 --- a/drivers/scsi/lpfc/lpfc_nvme.h +++ b/drivers/scsi/lpfc/lpfc_nvme.h @@ -28,6 +28,7 @@ #define LPFC_NVME_ERSP_LEN 0x20 #define LPFC_NVME_WAIT_TMO 10 +#define LPFC_NVME_EXPEDITE_XRICNT 8 struct lpfc_nvme_qhandle { uint32_t index; /* WQ index to use */ -- 2.7.4