qla2xxx: Restore WWPN in case of Loop Dead.

For FA-WWPN capable device, ISP2031 and ISP27XX, when loop
dead is detected by a driver, restore WWPN from NVRAM.

Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

4 files changed, 18 insertions, 3 deletions

diff --git a/drivers/scsi/qla2xxx/qla_dbg.c b/drivers/scsi/qla2xxx/qla_dbg.c
index b21adb3d5e67..5f25cf0db568 100644
--- a/drivers/scsi/qla2xxx/qla_dbg.c
+++ b/drivers/scsi/qla2xxx/qla_dbg.c
@@ -11,8 +11,7 @@
  * ----------------------------------------------------------------------
  * |             Level            |   Last Value Used  |     Holes      |
  * ----------------------------------------------------------------------
- * | Module Init and Probe        |       0x017d       | 0x0141         |
- * |                              |                    | 0x0144,0x0146  |
+ * | Module Init and Probe        |       0x017d       | 0x0144,0x0146  |
  * |                              |                    | 0x015b-0x0160  |
  * |                              |                    | 0x016e-0x0170  |
  * | Mailbox commands             |       0x118d       | 0x1115-0x1116  |
diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index d529510bbc6c..a3bab3a3efdd 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -2945,7 +2945,8 @@ struct qla_hw_data {
 
                 uint32_t        mr_reset_hdlr_active:1;
                 uint32_t        mr_intr_valid:1;
-                /* 34 bits */
+                uint32_t        fawwpn_enabled:1;
+                /* 35 bits */
         } flags;
 
         /* This spinlock is used to protect "io transactions", you must
diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 51cabb953552..23f12dddcb4a 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -2202,6 +2202,11 @@ qla2x00_init_rings(scsi_qla_host_t *vha)
                 if (IS_DPORT_CAPABLE(ha))
                         mid_init_cb->init_cb.firmware_options_1 |=
                             cpu_to_le16(BIT_7);
+                /* Enable FA-WWPN */
+                ha->flags.fawwpn_enabled =
+                    (mid_init_cb->init_cb.firmware_options_1 & BIT_6) ? 1 : 0;
+                ql_dbg(ql_dbg_init, vha, 0x0141, "FA-WWPN Support: %s.\n",
+                    (ha->flags.fawwpn_enabled) ? "enabled" : "disabled");
         }
 
         rval = qla2x00_init_firmware(vha, ha->init_cb_size);
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index f15f87e1abd8..696e4a2d3fa7 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -752,6 +752,16 @@ skip_rio:
                 if (atomic_read(&vha->loop_state) != LOOP_DOWN) {
                         atomic_set(&vha->loop_state, LOOP_DOWN);
                         atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
+                        /*
+                         * In case of loop down, restore WWPN from
+                         * NVRAM in case of FA-WWPN capable ISP
+                         */
+                        if (ha->flags.fawwpn_enabled) {
+                                void *wwpn = ha->init_cb->port_name;
+
+                                memcpy(vha->port_name, wwpn, WWN_SIZE);
+                        }
+
                         vha->device_flags |= DFLG_NO_CABLE;
                         qla2x00_mark_all_devices_lost(vha, 1);
                 }