From: James Smart <jsmart2021@gmail.com>
Date: Mon, 10 Sep 2018 10:30:43 -0700
Subject: [PATCH] scsi: lpfc: Raise nvme defaults to support a larger io and
 more connectivity
Git-commit: faf0a5f829eb2860a9b1301ea86e124299c062cf
Patch-mainline: v4.20-rc1
References: bsc#1114015

When nvme is enabled, change the default for two parameters:
 sg_seg_cnt - raise the per-io sg list size so that 1MB ios are
     supported (based on a 4k buffer per element).
 iocb_cnt - raise the number of buffers used for things like
     NVME LS request/responses to allow more concurrent requests
     to for larger nvme configs.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 drivers/scsi/lpfc/lpfc_attr.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index fcf8b77e0d1f..18750bf2883c 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -6641,6 +6641,16 @@ lpfc_get_cfgparam(struct lpfc_hba *phba)
 	lpfc_sli_mode_init(phba, lpfc_sli_mode);
 	phba->cfg_enable_dss = 1;
 	lpfc_enable_mds_diags_init(phba, lpfc_enable_mds_diags);
+
+	/* If the NVME FC4 type is enabled, scale the sg_seg_cnt to
+	 * accommodate 512K and 1M IOs in a single nvme buf and supply
+	 * enough NVME LS iocb buffers for larger connectivity counts.
+	 */
+	if (phba->cfg_enable_fc4_type & LPFC_ENABLE_NVME) {
+		phba->cfg_sg_seg_cnt = LPFC_MAX_NVME_SEG_CNT;
+		phba->cfg_iocb_cnt = 5;
+	}
+
 	return;
 }
 
-- 
2.16.4