scsi: qla2xxx: Add mode control for each physical port

Add ability to allow each physical port to control operating mode.  Current
code forces all ports to behave in one mode (i.e. initiator, target or
dual). This patch allows user to select the operating mode for each port.

- Driver must be loaded in dual mode to allow resource allocation

modprobe qla2xxx qlini_mode=dual

- In addition user can make adjustment to exchange resources using following
  command

echo 1024 > /sys/class/scsi_host/host<x>/ql2xiniexchg
echo 1024 > /sys/class/scsi_host/host<x>/ql2xexchoffld

- trigger mode change and new setting of ql2xexchoffld|ql2xiniexchg

echo [<value>] > /sys/class/scsi_host/host<x>/qlini_mode

where, value can be one of following
  - enabled
  - disabled
  - dual
  - exclusive

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>

1 files changed, 44 insertions, 15 deletions

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 3befe11d6425..d21dd7700d5d 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -4290,29 +4290,34 @@ static void
 qla2x00_number_of_exch(scsi_qla_host_t *vha, u32 *ret_cnt, u16 max_cnt)
 {
 	u32 temp;
+	struct init_cb_81xx *icb = (struct init_cb_81xx *)&vha->hw->init_cb;
 	*ret_cnt = FW_DEF_EXCHANGES_CNT;
 
 	if (max_cnt > vha->hw->max_exchg)
 		max_cnt = vha->hw->max_exchg;
 
 	if (qla_ini_mode_enabled(vha)) {
-		if (ql2xiniexchg > max_cnt)
-			ql2xiniexchg = max_cnt;
+		if (vha->ql2xiniexchg > max_cnt)
+			vha->ql2xiniexchg = max_cnt;
+
+		if (vha->ql2xiniexchg > FW_DEF_EXCHANGES_CNT)
+			*ret_cnt = vha->ql2xiniexchg;
 
-		if (ql2xiniexchg > FW_DEF_EXCHANGES_CNT)
-			*ret_cnt = ql2xiniexchg;
 	} else if (qla_tgt_mode_enabled(vha)) {
-		if (ql2xexchoffld > max_cnt)
-			ql2xexchoffld = max_cnt;
+		if (vha->ql2xexchoffld > max_cnt) {
+			vha->ql2xexchoffld = max_cnt;
+			icb->exchange_count = cpu_to_le16(vha->ql2xexchoffld);
+		}
 
-		if (ql2xexchoffld > FW_DEF_EXCHANGES_CNT)
-			*ret_cnt = ql2xexchoffld;
+		if (vha->ql2xexchoffld > FW_DEF_EXCHANGES_CNT)
+			*ret_cnt = vha->ql2xexchoffld;
 	} else if (qla_dual_mode_enabled(vha)) {
-		temp = ql2xiniexchg + ql2xexchoffld;
+		temp = vha->ql2xiniexchg + vha->ql2xexchoffld;
 		if (temp > max_cnt) {
-			ql2xiniexchg -= (temp - max_cnt)/2;
-			ql2xexchoffld -= (((temp - max_cnt)/2) + 1);
+			vha->ql2xiniexchg -= (temp - max_cnt)/2;
+			vha->ql2xexchoffld -= (((temp - max_cnt)/2) + 1);
 			temp = max_cnt;
+			icb->exchange_count = cpu_to_le16(vha->ql2xexchoffld);
 		}
 
 		if (temp > FW_DEF_EXCHANGES_CNT)
@@ -4350,6 +4355,12 @@ qla2x00_set_exchoffld_buffer(scsi_qla_host_t *vha)
 
 	if (totsz != ha->exchoffld_size) {
 		qla2x00_free_exchoffld_buffer(ha);
+		if (actual_cnt <= FW_DEF_EXCHANGES_CNT) {
+			ha->exchoffld_size = 0;
+			ha->flags.exchoffld_enabled = 0;
+			return QLA_SUCCESS;
+		}
+
 		ha->exchoffld_size = totsz;
 
 		ql_log(ql_log_info, vha, 0xd016,
@@ -4382,6 +4393,15 @@ qla2x00_set_exchoffld_buffer(scsi_qla_host_t *vha)
 
 			return -ENOMEM;
 		}
+	} else if (!ha->exchoffld_buf || (actual_cnt <= FW_DEF_EXCHANGES_CNT)) {
+		/* pathological case */
+		qla2x00_free_exchoffld_buffer(ha);
+		ha->exchoffld_size = 0;
+		ha->flags.exchoffld_enabled = 0;
+		ql_log(ql_log_info, vha, 0xd016,
+		    "Exchange offload not enable: offld size=%d, actual count=%d entry sz=0x%x, total sz=0x%x.\n",
+		    ha->exchoffld_size, actual_cnt, size, totsz);
+		return 0;
 	}
 
 	/* Now configure the dma buffer */
@@ -4397,7 +4417,7 @@ qla2x00_set_exchoffld_buffer(scsi_qla_host_t *vha)
 		if (qla_ini_mode_enabled(vha))
 			icb->exchange_count = 0;
 		else
-			icb->exchange_count = cpu_to_le16(ql2xexchoffld);
+			icb->exchange_count = cpu_to_le16(vha->ql2xexchoffld);
 	}
 
 	return rval;
@@ -4605,6 +4625,10 @@ struct scsi_qla_host *qla2x00_create_host(struct scsi_host_template *sht,
 	vha->host_no = host->host_no;
 	vha->hw = ha;
 
+	vha->qlini_mode = ql2x_ini_mode;
+	vha->ql2xexchoffld = ql2xexchoffld;
+	vha->ql2xiniexchg = ql2xiniexchg;
+
 	INIT_LIST_HEAD(&vha->vp_fcports);
 	INIT_LIST_HEAD(&vha->work_list);
 	INIT_LIST_HEAD(&vha->list);
@@ -6081,15 +6105,17 @@ qla2x00_do_dpc(void *data)
 		    !test_bit(UNLOADING, &base_vha->dpc_flags)) {
 			bool do_reset = true;
 
-			switch (ql2x_ini_mode) {
+			switch (base_vha->qlini_mode) {
 			case QLA2XXX_INI_MODE_ENABLED:
 				break;
 			case QLA2XXX_INI_MODE_DISABLED:
-				if (!qla_tgt_mode_enabled(base_vha))
+				if (!qla_tgt_mode_enabled(base_vha) &&
+				    !ha->flags.fw_started)
 					do_reset = false;
 				break;
 			case QLA2XXX_INI_MODE_DUAL:
-				if (!qla_dual_mode_enabled(base_vha))
+				if (!qla_dual_mode_enabled(base_vha) &&
+				    !ha->flags.fw_started)
 					do_reset = false;
 				break;
 			default:
@@ -7020,6 +7046,9 @@ qla2x00_module_init(void)
 	if (ql2xextended_error_logging == 1)
 		ql2xextended_error_logging = QL_DBG_DEFAULT1_MASK;
 
+	if (ql2x_ini_mode == QLA2XXX_INI_MODE_DUAL)
+		qla_insert_tgt_attrs();
+
 	qla2xxx_transport_template =
 	    fc_attach_transport(&qla2xxx_transport_functions);
 	if (!qla2xxx_transport_template) {