From d38f33b304229b0445c3292ebf2b7bf24dda6917 Mon Sep 17 00:00:00 2001 From: James Smart Date: Fri, 4 May 2018 20:37:54 -0700 Subject: [PATCH] scsi: lpfc: Driver NVME load fails when CPU cnt > WQ resource cnt If the cpu count is larger than the number of WQ resources available, adapter attachment eventually failes due to a WQ_CREATE failure. Calculate the number of WQs desired (which initializes to cpu count) after accounting for the number of queues the adapter supports and the number allocated to SCSI and the control/ELS path, and scale down if necessary. Signed-off-by: Dick Kennedy Signed-off-by: James Smart Signed-off-by: Martin K. Petersen --- drivers/scsi/lpfc/lpfc_init.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 0ba49e6..1194320 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -7790,6 +7790,40 @@ lpfc_sli4_read_config(struct lpfc_hba *phba) phba->sli4_hba.max_cfg_param.max_wq, phba->sli4_hba.max_cfg_param.max_rq); + /* + * Calculate NVME queue resources based on how + * many WQ/CQs are available. + */ + if (phba->cfg_enable_fc4_type & LPFC_ENABLE_NVME) { + length = phba->sli4_hba.max_cfg_param.max_wq; + if (phba->sli4_hba.max_cfg_param.max_cq < + phba->sli4_hba.max_cfg_param.max_wq) + length = phba->sli4_hba.max_cfg_param.max_cq; + + /* + * Whats left after this can go toward NVME. + * The minus 6 accounts for ELS, NVME LS, MBOX + * fof plus a couple extra. When configured for + * NVMET, FCP io channel WQs are not created. + */ + length -= 6; + if (!phba->nvmet_support) + length -= phba->cfg_fcp_io_channel; + + if (phba->cfg_nvme_io_channel > length) { + lpfc_printf_log( + phba, KERN_ERR, LOG_SLI, + "2005 Reducing NVME IO channel to %d: " + "WQ %d CQ %d NVMEIO %d FCPIO %d\n", + length, + phba->sli4_hba.max_cfg_param.max_wq, + phba->sli4_hba.max_cfg_param.max_cq, + phba->cfg_nvme_io_channel, + phba->cfg_fcp_io_channel); + + phba->cfg_nvme_io_channel = length; + } + } } if (rc) -- 2.7.4