[PATCH] lpfc: in sli3 use configured sg_seg_cnt for sg_tablesize

[bstroesser@ts.fujitsu.com]

Hi James,

We had some performance problems with RAID systems connected to LPe12k.
AFAICS, the reason is a small bug in lpfc.ko, causing the IO-size to
be smaller than expected.

The patch below fixes it for us.

Please CC me, I'm not on the list.

Best regards
Bodo


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From: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Date: Fri, 29 May 2015 13:34:19 +0200
Subject: [PATCH] lpfc: in sli3 use configured sg_seg_cnt for sg_tablesize

Currently the module parameter lpfc_sg_seg_count does not have effect
for sli3 devices.

In lpfc_sli_driver_resource_setup(), which is used for sli3, the code
writes the configured sg_seg_cnt into lpfc_template.sg_tablesize.
But lpfc_template is the template used for sli4 only. Thus the value should
correctly be written to lpfc_template_s3->sg_tablesize.

This patch is for kernel 4.1-rc5, but is tested with lpfc 10.2.405.26 only.

Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
---

--- a/drivers/scsi/lpfc/lpfc_init.c	2015-05-29 10:19:02.000000000 +0200
+++ b/drivers/scsi/lpfc/lpfc_init.c	2015-05-29 10:19:56.000000000 +0200
@@ -4988,7 +4988,7 @@ lpfc_sli_driver_resource_setup(struct lp
 
 	/* Initialize the host templates the configured values. */
 	lpfc_vport_template.sg_tablesize = phba->cfg_sg_seg_cnt;
-	lpfc_template.sg_tablesize = phba->cfg_sg_seg_cnt;
+	lpfc_template_s3.sg_tablesize = phba->cfg_sg_seg_cnt;
 
 	/* There are going to be 2 reserved BDEs: 1 FCP cmnd + 1 FCP rsp */
 	if (phba->cfg_enable_bg) {