qla2xxx: Add framework for async fabric discovery

Currently code performs a full scan of the fabric for
every RSCN. Its an expensive process in a noisy large SAN.

This patch optimizes expensive fabric discovery process by
scanning switch for the affected port when RSCN is received.

Currently Initiator Mode code makes login/logout decision without
knowledge of target mode. This causes driver and firmware to go
out-of-sync. This framework synchronizes both initiator mode
personality and target mode personality in making login/logout
decision.

This patch adds following capabilities in the driver

- Send Notification Acknowledgement asynchronously.
- Update session/fcport state asynchronously.
- Create a session or fcport struct asynchronously.
- Send GNL asynchronously. The command will ask FW to
  provide a list of FC Port entries FW knows about.
- Send GPDB asynchronously. The command will ask FW to
  provide detail data of an FC Port FW knows about or
  perform ADISC to verify the state of the session.
- Send GPNID asynchronously. The command will ask switch
  to provide WWPN for provided NPort ID.
- Send GPSC asynchronously. The command will ask switch
  to provide registered port speed for provided WWPN.
- Send GIDPN asynchronously. The command will ask the
  switch to provide Nport ID for provided WWPN.
- In driver unload path, schedule all session for deletion
  and wait for deletion to complete before allowing driver
  unload to proceed.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
[ bvanassche: fixed spelling in patch description ]
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 66 insertions, 5 deletions

diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
index 834e22197842..33d3d90c089b 100644
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -2247,7 +2247,7 @@ qla24xx_logout_iocb(srb_t *sp, struct logio_entry_24xx *logio)
 	logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;
 	logio->control_flags =
 	    cpu_to_le16(LCF_COMMAND_LOGO|LCF_IMPL_LOGO);
-	if (!sp->fcport->tgt_session ||
+	if (!sp->fcport->se_sess ||
 	    !sp->fcport->keep_nport_handle)
 		logio->control_flags |= cpu_to_le16(LCF_FREE_NPORT);
 	logio->nport_handle = cpu_to_le16(sp->fcport->loop_id);
@@ -3079,19 +3079,69 @@ qla24xx_abort_iocb(srb_t *sp, struct abort_entry_24xx *abt_iocb)
 	wmb();
 }
 
+static void
+qla2x00_mb_iocb(srb_t *sp, struct mbx_24xx_entry *mbx)
+{
+	int i, sz;
+
+	mbx->entry_type = MBX_IOCB_TYPE;
+	mbx->handle = sp->handle;
+	sz = min(ARRAY_SIZE(mbx->mb), ARRAY_SIZE(sp->u.iocb_cmd.u.mbx.out_mb));
+
+	for (i = 0; i < sz; i++)
+		mbx->mb[i] = cpu_to_le16(sp->u.iocb_cmd.u.mbx.out_mb[i]);
+}
+
+static void
+qla2x00_ctpthru_cmd_iocb(srb_t *sp, struct ct_entry_24xx *ct_pkt)
+{
+	sp->u.iocb_cmd.u.ctarg.iocb = ct_pkt;
+	qla24xx_prep_ms_iocb(sp->vha, &sp->u.iocb_cmd.u.ctarg);
+	ct_pkt->handle = sp->handle;
+}
+
+static void qla2x00_send_notify_ack_iocb(srb_t *sp,
+	struct nack_to_isp *nack)
+{
+	struct imm_ntfy_from_isp *ntfy = sp->u.iocb_cmd.u.nack.ntfy;
+
+	nack->entry_type = NOTIFY_ACK_TYPE;
+	nack->entry_count = 1;
+	nack->ox_id = ntfy->ox_id;
+
+	nack->u.isp24.handle = sp->handle;
+	nack->u.isp24.nport_handle = ntfy->u.isp24.nport_handle;
+	if (le16_to_cpu(ntfy->u.isp24.status) == IMM_NTFY_ELS) {
+		nack->u.isp24.flags = ntfy->u.isp24.flags &
+			cpu_to_le32(NOTIFY24XX_FLAGS_PUREX_IOCB);
+	}
+	nack->u.isp24.srr_rx_id = ntfy->u.isp24.srr_rx_id;
+	nack->u.isp24.status = ntfy->u.isp24.status;
+	nack->u.isp24.status_subcode = ntfy->u.isp24.status_subcode;
+	nack->u.isp24.fw_handle = ntfy->u.isp24.fw_handle;
+	nack->u.isp24.exchange_address = ntfy->u.isp24.exchange_address;
+	nack->u.isp24.srr_rel_offs = ntfy->u.isp24.srr_rel_offs;
+	nack->u.isp24.srr_ui = ntfy->u.isp24.srr_ui;
+	nack->u.isp24.srr_flags = 0;
+	nack->u.isp24.srr_reject_code = 0;
+	nack->u.isp24.srr_reject_code_expl = 0;
+	nack->u.isp24.vp_index = ntfy->u.isp24.vp_index;
+}
+
 int
 qla2x00_start_sp(srb_t *sp)
 {
 	int rval;
-	struct qla_hw_data *ha = sp->fcport->vha->hw;
+	scsi_qla_host_t *vha = (scsi_qla_host_t *)sp->vha;
+	struct qla_hw_data *ha = vha->hw;
 	void *pkt;
 	unsigned long flags;
 
 	rval = QLA_FUNCTION_FAILED;
 	spin_lock_irqsave(&ha->hardware_lock, flags);
-	pkt = qla2x00_alloc_iocbs(sp->fcport->vha, sp);
+	pkt = qla2x00_alloc_iocbs(vha, sp);
 	if (!pkt) {
-		ql_log(ql_log_warn, sp->fcport->vha, 0x700c,
+		ql_log(ql_log_warn, vha, 0x700c,
 		    "qla2x00_alloc_iocbs failed.\n");
 		goto done;
 	}
@@ -3139,12 +3189,23 @@ qla2x00_start_sp(srb_t *sp)
 	case SRB_ELS_DCMD:
 		qla24xx_els_logo_iocb(sp, pkt);
 		break;
+	case SRB_CT_PTHRU_CMD:
+		qla2x00_ctpthru_cmd_iocb(sp, pkt);
+		break;
+	case SRB_MB_IOCB:
+		qla2x00_mb_iocb(sp, pkt);
+		break;
+	case SRB_NACK_PLOGI:
+	case SRB_NACK_PRLI:
+	case SRB_NACK_LOGO:
+		qla2x00_send_notify_ack_iocb(sp, pkt);
+		break;
 	default:
 		break;
 	}
 
 	wmb();
-	qla2x00_start_iocbs(sp->fcport->vha, ha->req_q_map[0]);
+	qla2x00_start_iocbs(vha, ha->req_q_map[0]);
 done:
 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 	return rval;