[SCSI] qla2xxx: Handle MPI timeout indicated by AE8002

In case the MPI times out, the FW issues an async event AE8002
to indicate this to every FCoE function. The FC/FCoE driver is
required to handle this, by doing a soft reset and issuing a
Write MPI register mailbox command to reset the MPI.

Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index f2da5c5dacdd..c2d7bb8cd53f 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -944,6 +944,19 @@ qla2x00_reset_chip(scsi_qla_host_t *vha)
 }
 
 /**
+ * qla81xx_reset_mpi() - Reset's MPI FW via Write MPI Register MBC.
+ *
+ * Returns 0 on success.
+ */
+int
+qla81xx_reset_mpi(scsi_qla_host_t *vha)
+{
+        uint16_t mb[4] = {0x1010, 0, 1, 0};
+
+        return qla81xx_write_mpi_register(vha, mb);
+}
+
+/**
  * qla24xx_reset_risc() - Perform full reset of ISP24xx RISC.
  * @ha: HA context
  *
@@ -957,6 +970,7 @@ qla24xx_reset_risc(scsi_qla_host_t *vha)
         struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;
         uint32_t cnt, d2;
         uint16_t wd;
+        static int abts_cnt; /* ISP abort retry counts */
 
         spin_lock_irqsave(&ha->hardware_lock, flags);
 
@@ -990,6 +1004,23 @@ qla24xx_reset_risc(scsi_qla_host_t *vha)
                 barrier();
         }
 
+        /* If required, do an MPI FW reset now */
+        if (test_and_clear_bit(MPI_RESET_NEEDED, &vha->dpc_flags)) {
+                if (qla81xx_reset_mpi(vha) != QLA_SUCCESS) {
+                        if (++abts_cnt < 5) {
+                                set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
+                                set_bit(MPI_RESET_NEEDED, &vha->dpc_flags);
+                        } else {
+                                /*
+                                 * We exhausted the ISP abort retries. We have to
+                                 * set the board offline.
+                                 */
+                                abts_cnt = 0;
+                                vha->flags.online = 0;
+                        }
+                }
+        }
+
         WRT_REG_DWORD(&reg->hccr, HCCRX_SET_RISC_RESET);
         RD_REG_DWORD(&reg->hccr);