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scsi: lpfc: Add Buffer to Buffer credit recovery support

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Add Buffer to buffer credit recovery support to the driver.  This is a
negotiated feature with the peer that allows for both sides to detect
dropped RRDY's and FC Frames and recover credit.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart
2017-08-23 16:55:47 -07:00
committed by Martin K. Petersen
parent d58734f05f
commit 44fd7fe3dd
10 changed files with 162 additions and 14 deletions
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14
drivers/scsi/lpfc/lpfc_els.c
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@@ -2033,6 +2033,7 @@ lpfc_issue_els_plogi(struct lpfc_vport *vport, uint32_t did, uint8_t retry)
sp->cmn.valid_vendor_ver_level = 0;
memset(sp->un.vendorVersion, 0, sizeof(sp->un.vendorVersion));
sp->cmn.bbRcvSizeMsb &= 0xF;
lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
"Issue PLOGI: did:x%x",
@@ -3456,8 +3457,18 @@ lpfc_els_retry(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
maxretry = 3;
delay = 1000;
retry = 1;
break;
} else if (cmd == ELS_CMD_FLOGI &&
stat.un.b.lsRjtRsnCodeExp ==
LSEXP_NOTHING_MORE) {
vport->fc_sparam.cmn.bbRcvSizeMsb &= 0xf;
retry = 1;
lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
"0820 FLOGI Failed (x%x). "
"BBCredit Not Supported\n",
stat.un.lsRjtError);
}
break;
case LSRJT_PROTOCOL_ERR:
if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
(cmd == ELS_CMD_FDISC) &&
@@ -4201,6 +4212,7 @@ lpfc_els_rsp_acc(struct lpfc_vport *vport, uint32_t flag,
sp->cmn.valid_vendor_ver_level = 0;
memset(sp->un.vendorVersion, 0,
sizeof(sp->un.vendorVersion));
sp->cmn.bbRcvSizeMsb &= 0xF;
/* If our firmware supports this feature, convey that
* info to the target using the vendor specific field.