scsi: qla2xxx: Add ability to send PRLO

Add ability to send Implicit PRLO to flush IOs
from FW back to driver.
Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_def.h

@@ -507,6 +507,7 @@ struct srb_iocb {
 #define SRB_NVME_LS	20
 #define SRB_PRLI_CMD	21
 #define SRB_CTRL_VP	22
+#define SRB_PRLO_CMD	23
 
 enum {
 	TYPE_SRB,
@@ -3140,6 +3141,8 @@ enum qla_work_type {
 	QLA_EVT_GNL,
 	QLA_EVT_NACK,
 	QLA_EVT_RELOGIN,
+	QLA_EVT_ASYNC_PRLO,
+	QLA_EVT_ASYNC_PRLO_DONE,
 };
 
 

drivers/scsi/qla2xxx/qla_gbl.h

@@ -66,6 +66,7 @@ extern void qla84xx_put_chip(struct scsi_qla_host *);
 extern int qla2x00_async_login(struct scsi_qla_host *, fc_port_t *,
     uint16_t *);
 extern int qla2x00_async_logout(struct scsi_qla_host *, fc_port_t *);
+extern int qla2x00_async_prlo(struct scsi_qla_host *, fc_port_t *);
 extern int qla2x00_async_adisc(struct scsi_qla_host *, fc_port_t *,
     uint16_t *);
 extern int qla2x00_async_tm_cmd(fc_port_t *, uint32_t, uint32_t, uint32_t);
@@ -109,6 +110,13 @@ int qla24xx_post_newsess_work(struct scsi_qla_host *, port_id_t *, u8 *,
 int qla24xx_fcport_handle_login(struct scsi_qla_host *, fc_port_t *);
 int qla24xx_detect_sfp(scsi_qla_host_t *vha);
 int qla24xx_post_gpdb_work(struct scsi_qla_host *, fc_port_t *, u8);
+void qla2x00_async_prlo_done(struct scsi_qla_host *, fc_port_t *,
+    uint16_t *);
+extern int qla2x00_post_async_prlo_work(struct scsi_qla_host *, fc_port_t *,
+    uint16_t *);
+extern int qla2x00_post_async_prlo_done_work(struct scsi_qla_host *,
+    fc_port_t *, uint16_t *);
+
 /*
  * Global Data in qla_os.c source file.
  */

drivers/scsi/qla2xxx/qla_init.c

@@ -278,6 +278,65 @@ qla2x00_async_logout(struct scsi_qla_host *vha, fc_port_t *fcport)
 	fcport->flags &= ~FCF_ASYNC_SENT;
 	return rval;
 }
+
+void
+qla2x00_async_prlo_done(struct scsi_qla_host *vha, fc_port_t *fcport,
+    uint16_t *data)
+{
+	/* Don't re-login in target mode */
+	if (!fcport->tgt_session)
+		qla2x00_mark_device_lost(vha, fcport, 1, 0);
+	qlt_logo_completion_handler(fcport, data[0]);
+}
+
+static void
+qla2x00_async_prlo_sp_done(void *s, int res)
+{
+	srb_t *sp = (srb_t *)s;
+	struct srb_iocb *lio = &sp->u.iocb_cmd;
+	struct scsi_qla_host *vha = sp->vha;
+
+	if (!test_bit(UNLOADING, &vha->dpc_flags))
+		qla2x00_post_async_prlo_done_work(sp->fcport->vha, sp->fcport,
+		    lio->u.logio.data);
+	sp->free(sp);
+}
+
+int
+qla2x00_async_prlo(struct scsi_qla_host *vha, fc_port_t *fcport)
+{
+	srb_t *sp;
+	struct srb_iocb *lio;
+	int rval;
+
+	rval = QLA_FUNCTION_FAILED;
+	sp = qla2x00_get_sp(vha, fcport, GFP_KERNEL);
+	if (!sp)
+		goto done;
+
+	sp->type = SRB_PRLO_CMD;
+	sp->name = "prlo";
+	qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);
+
+	lio = &sp->u.iocb_cmd;
+	lio->timeout = qla2x00_async_iocb_timeout;
+	sp->done = qla2x00_async_prlo_sp_done;
+	rval = qla2x00_start_sp(sp);
+	if (rval != QLA_SUCCESS)
+		goto done_free_sp;
+
+	ql_dbg(ql_dbg_disc, vha, 0x2070,
+	    "Async-prlo - hdl=%x loop-id=%x portid=%02x%02x%02x.\n",
+	    sp->handle, fcport->loop_id, fcport->d_id.b.domain,
+	    fcport->d_id.b.area, fcport->d_id.b.al_pa);
+	return rval;
+
+done_free_sp:
+	sp->free(sp);
+done:
+	return rval;
+}
+
 static
 void qla24xx_handle_adisc_event(scsi_qla_host_t *vha, struct event_arg *ea)
 {

drivers/scsi/qla2xxx/qla_iocb.c

@@ -3390,6 +3390,20 @@ qla25xx_ctrlvp_iocb(srb_t *sp, struct vp_ctrl_entry_24xx *vce)
 	vce->vp_idx_map[map] |= 1 << pos;
 }
 
+static void
+qla24xx_prlo_iocb(srb_t *sp, struct logio_entry_24xx *logio)
+{
+	logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;
+	logio->control_flags =
+	    cpu_to_le16(LCF_COMMAND_PRLO|LCF_IMPL_PRLO);
+
+	logio->nport_handle = cpu_to_le16(sp->fcport->loop_id);
+	logio->port_id[0] = sp->fcport->d_id.b.al_pa;
+	logio->port_id[1] = sp->fcport->d_id.b.area;
+	logio->port_id[2] = sp->fcport->d_id.b.domain;
+	logio->vp_index = sp->fcport->vha->vp_idx;
+}
+
 int
 qla2x00_start_sp(srb_t *sp)
 {
@@ -3471,6 +3485,9 @@ qla2x00_start_sp(srb_t *sp)
 	case SRB_CTRL_VP:
 		qla25xx_ctrlvp_iocb(sp, pkt);
 		break;
+	case SRB_PRLO_CMD:
+		qla24xx_prlo_iocb(sp, pkt);
+		break;
 	default:
 		break;
 	}

drivers/scsi/qla2xxx/qla_os.c

@@ -4690,6 +4690,8 @@ qla2x00_post_async_work(logout, QLA_EVT_ASYNC_LOGOUT);
 qla2x00_post_async_work(logout_done, QLA_EVT_ASYNC_LOGOUT_DONE);
 qla2x00_post_async_work(adisc, QLA_EVT_ASYNC_ADISC);
 qla2x00_post_async_work(adisc_done, QLA_EVT_ASYNC_ADISC_DONE);
+qla2x00_post_async_work(prlo, QLA_EVT_ASYNC_PRLO);
+qla2x00_post_async_work(prlo_done, QLA_EVT_ASYNC_PRLO_DONE);
 
 int
 qla2x00_post_uevent_work(struct scsi_qla_host *vha, u32 code)
@@ -4943,6 +4945,13 @@ qla2x00_do_work(struct scsi_qla_host *vha)
 		case QLA_EVT_NACK:
 			qla24xx_do_nack_work(vha, e);
 			break;
+		case QLA_EVT_ASYNC_PRLO:
+			qla2x00_async_prlo(vha, e->u.logio.fcport);
+			break;
+		case QLA_EVT_ASYNC_PRLO_DONE:
+			qla2x00_async_prlo_done(vha, e->u.logio.fcport,
+			    e->u.logio.data);
+			break;
 		}
 		if (e->flags & QLA_EVT_FLAG_FREE)
 			kfree(e);