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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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12
drivers/scsi/lpfc/lpfc_hbadisc.c
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@@ -1108,6 +1108,7 @@ void
lpfc_mbx_cmpl_local_config_link(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
{
struct lpfc_vport *vport = pmb->vport;
uint8_t bbscn = 0;
if (pmb->u.mb.mbxStatus)
goto out;
@@ -1134,10 +1135,17 @@ lpfc_mbx_cmpl_local_config_link(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
/* Start discovery by sending a FLOGI. port_state is identically
* LPFC_FLOGI while waiting for FLOGI cmpl
*/
if (vport->port_state != LPFC_FLOGI)
if (vport->port_state != LPFC_FLOGI) {
if (phba->bbcredit_support && phba->cfg_enable_bbcr) {
bbscn = bf_get(lpfc_bbscn_def,
&phba->sli4_hba.bbscn_params);
vport->fc_sparam.cmn.bbRcvSizeMsb &= 0xf;
vport->fc_sparam.cmn.bbRcvSizeMsb |= (bbscn << 4);
}
lpfc_initial_flogi(vport);
else if (vport->fc_flag & FC_PT2PT)
} else if (vport->fc_flag & FC_PT2PT) {
lpfc_disc_start(vport);
}
return;
out: