[SCSI] qla2xxx: Properly acknowledge IDC notification messages.

To ensure smooth operations amongst the FCoE and NIC side
components of the ISP81xx chip, the FCoE driver (qla2xxx) must
ensure the 10gb NIC driver (qlge) does not timeout waiting for
IDC (Inter-Driver Communication) acknowledgments.  The
acknowledgment requirements are trivial -- a simple mirroring of
incoming mailbox registers during the AEN to a process-context
capable mailbox command.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index c11f872d3e10..2f5f72531e23 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -2522,6 +2522,19 @@ qla2x00_post_aen_work(struct scsi_qla_host *vha, enum fc_host_event_code code,
         return qla2x00_post_work(vha, e, 1);
 }
 
+int
+qla2x00_post_idc_ack_work(struct scsi_qla_host *vha, uint16_t *mb)
+{
+        struct qla_work_evt *e;
+
+        e = qla2x00_alloc_work(vha, QLA_EVT_IDC_ACK, 1);
+        if (!e)
+                return QLA_FUNCTION_FAILED;
+
+        memcpy(e->u.idc_ack.mb, mb, QLA_IDC_ACK_REGS * sizeof(uint16_t));
+        return qla2x00_post_work(vha, e, 1);
+}
+
 static void
 qla2x00_do_work(struct scsi_qla_host *vha)
 {
@@ -2539,6 +2552,9 @@ qla2x00_do_work(struct scsi_qla_host *vha)
                         fc_host_post_event(vha->host, fc_get_event_number(),
                             e->u.aen.code, e->u.aen.data);
                         break;
+                case QLA_EVT_IDC_ACK:
+                        qla81xx_idc_ack(vha, e->u.idc_ack.mb);
+                        break;
                 }
                 if (e->flags & QLA_EVT_FLAG_FREE)
                         kfree(e);