[SCSI] bfa: Support for FC BB credit recovery

This patch includes changes to  1) Enable/disable fc credit recovery on
Brocade FC adapter port operating at max supported speed. 2) Get credit
recovery status and stats related to credit loss and recovered credits

Signed-off-by: Vijaya Mohan Guvva <vmohan@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 6 insertions, 56 deletions

diff --git a/drivers/scsi/bfa/bfa_fcs.c b/drivers/scsi/bfa/bfa_fcs.c
index d428808fb37e..a3ab5cce4208 100644
--- a/drivers/scsi/bfa/bfa_fcs.c
+++ b/drivers/scsi/bfa/bfa_fcs.c
@@ -240,9 +240,6 @@ static void bfa_fcs_fabric_flogiacc_comp(void *fcsarg,
 					 u32 rsp_len,
 					 u32 resid_len,
 					 struct fchs_s *rspfchs);
-static u8 bfa_fcs_fabric_oper_bbscn(struct bfa_fcs_fabric_s *fabric);
-static bfa_boolean_t bfa_fcs_fabric_is_bbscn_enabled(
-				struct bfa_fcs_fabric_s *fabric);
 
 static void	bfa_fcs_fabric_sm_uninit(struct bfa_fcs_fabric_s *fabric,
 					 enum bfa_fcs_fabric_event event);
@@ -404,8 +401,7 @@ bfa_fcs_fabric_sm_flogi(struct bfa_fcs_fabric_s *fabric,
 	case BFA_FCS_FABRIC_SM_CONT_OP:
 
 		bfa_fcport_set_tx_bbcredit(fabric->fcs->bfa,
-					   fabric->bb_credit,
-					   bfa_fcs_fabric_oper_bbscn(fabric));
+					   fabric->bb_credit);
 		fabric->fab_type = BFA_FCS_FABRIC_SWITCHED;
 
 		if (fabric->auth_reqd && fabric->is_auth) {
@@ -433,8 +429,7 @@ bfa_fcs_fabric_sm_flogi(struct bfa_fcs_fabric_s *fabric,
 	case BFA_FCS_FABRIC_SM_NO_FABRIC:
 		fabric->fab_type = BFA_FCS_FABRIC_N2N;
 		bfa_fcport_set_tx_bbcredit(fabric->fcs->bfa,
-					   fabric->bb_credit,
-					   bfa_fcs_fabric_oper_bbscn(fabric));
+					   fabric->bb_credit);
 		bfa_fcs_fabric_notify_online(fabric);
 		bfa_sm_set_state(fabric, bfa_fcs_fabric_sm_nofabric);
 		break;
@@ -602,8 +597,7 @@ bfa_fcs_fabric_sm_nofabric(struct bfa_fcs_fabric_s *fabric,
 	case BFA_FCS_FABRIC_SM_NO_FABRIC:
 		bfa_trc(fabric->fcs, fabric->bb_credit);
 		bfa_fcport_set_tx_bbcredit(fabric->fcs->bfa,
-					   fabric->bb_credit,
-					   bfa_fcs_fabric_oper_bbscn(fabric));
+					   fabric->bb_credit);
 		break;
 
 	case BFA_FCS_FABRIC_SM_RETRY_OP:
@@ -965,10 +959,6 @@ bfa_cb_lps_flogi_comp(void *bfad, void *uarg, bfa_status_t status)
 
 	case BFA_STATUS_FABRIC_RJT:
 		fabric->stats.flogi_rejects++;
-		if (fabric->lps->lsrjt_rsn == FC_LS_RJT_RSN_LOGICAL_ERROR &&
-		    fabric->lps->lsrjt_expl == FC_LS_RJT_EXP_NO_ADDL_INFO)
-			fabric->fcs->bbscn_flogi_rjt = BFA_TRUE;
-
 		bfa_sm_send_event(fabric, BFA_FCS_FABRIC_SM_RETRY_OP);
 		return;
 
@@ -1014,14 +1004,11 @@ bfa_fcs_fabric_login(struct bfa_fcs_fabric_s *fabric)
 {
 	struct bfa_s		*bfa = fabric->fcs->bfa;
 	struct bfa_lport_cfg_s	*pcfg = &fabric->bport.port_cfg;
-	u8			alpa = 0, bb_scn = 0;
+	u8			alpa = 0;
 
-	if (bfa_fcs_fabric_is_bbscn_enabled(fabric) &&
-	    (!fabric->fcs->bbscn_flogi_rjt))
-		bb_scn = BFA_FCS_PORT_DEF_BB_SCN;
 
 	bfa_lps_flogi(fabric->lps, fabric, alpa, bfa_fcport_get_maxfrsize(bfa),
-		      pcfg->pwwn, pcfg->nwwn, fabric->auth_reqd, bb_scn);
+		      pcfg->pwwn, pcfg->nwwn, fabric->auth_reqd);
 
 	fabric->stats.flogi_sent++;
 }
@@ -1102,40 +1089,6 @@ bfa_fcs_fabric_stop(struct bfa_fcs_fabric_s *fabric)
 }
 
 /*
- * Computes operating BB_SCN value
- */
-static u8
-bfa_fcs_fabric_oper_bbscn(struct bfa_fcs_fabric_s *fabric)
-{
-	u8	pr_bbscn = fabric->lps->pr_bbscn;
-	struct bfa_fcport_s *fcport = BFA_FCPORT_MOD(fabric->fcs->bfa);
-
-	if (!(fcport->cfg.bb_scn_state && pr_bbscn))
-		return 0;
-
-	/* return max of local/remote bb_scn values */
-	return ((pr_bbscn > BFA_FCS_PORT_DEF_BB_SCN) ?
-		pr_bbscn : BFA_FCS_PORT_DEF_BB_SCN);
-}
-
-/*
- * Check if BB_SCN can be enabled.
- */
-static bfa_boolean_t
-bfa_fcs_fabric_is_bbscn_enabled(struct bfa_fcs_fabric_s *fabric)
-{
-	struct bfa_fcport_s *fcport = BFA_FCPORT_MOD(fabric->fcs->bfa);
-
-	if (bfa_ioc_get_fcmode(&fabric->fcs->bfa->ioc) &&
-			fcport->cfg.bb_scn_state &&
-			!bfa_fcport_is_qos_enabled(fabric->fcs->bfa) &&
-			!bfa_fcport_is_trunk_enabled(fabric->fcs->bfa))
-		return BFA_TRUE;
-	else
-		return BFA_FALSE;
-}
-
-/*
  * Delete all vports and wait for vport delete completions.
  */
 static void
@@ -1273,7 +1226,6 @@ void
 bfa_fcs_fabric_link_down(struct bfa_fcs_fabric_s *fabric)
 {
 	bfa_trc(fabric->fcs, fabric->bport.port_cfg.pwwn);
-	fabric->fcs->bbscn_flogi_rjt = BFA_FALSE;
 	bfa_sm_send_event(fabric, BFA_FCS_FABRIC_SM_LINK_DOWN);
 }
 
@@ -1480,7 +1432,6 @@ bfa_fcs_fabric_process_flogi(struct bfa_fcs_fabric_s *fabric,
 	}
 
 	fabric->bb_credit = be16_to_cpu(flogi->csp.bbcred);
-	fabric->lps->pr_bbscn = (be16_to_cpu(flogi->csp.rxsz) >> 12);
 	bport->port_topo.pn2n.rem_port_wwn = flogi->port_name;
 	bport->port_topo.pn2n.reply_oxid = fchs->ox_id;
 
@@ -1513,8 +1464,7 @@ bfa_fcs_fabric_send_flogi_acc(struct bfa_fcs_fabric_s *fabric)
 				    n2n_port->reply_oxid, pcfg->pwwn,
 				    pcfg->nwwn,
 				    bfa_fcport_get_maxfrsize(bfa),
-				    bfa_fcport_get_rx_bbcredit(bfa),
-				    bfa_fcs_fabric_oper_bbscn(fabric));
+				    bfa_fcport_get_rx_bbcredit(bfa), 0);
 
 	bfa_fcxp_send(fcxp, NULL, fabric->vf_id, fabric->lps->bfa_tag,
 		      BFA_FALSE, FC_CLASS_3,