[SCSI] qla2xxx: Add FC-transport Asynchronous Event Notification support.

Supported events include LIP, LIP reset, RSCN, link up, and link
down.

To support AEN (and additional forthcoming features), we also
introduce a simple deferred-work construct to manage events which
require a non-atomic sleeping-capable context.  This work-list is
processed as part of the driver's standard DPC routine.

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

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index f70c78b6f364..35c730a3f0da 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -2115,6 +2115,26 @@ struct qla_msix_entry {
 
 #define WATCH_INTERVAL          1       /* number of seconds */
 
+/* Work events.  */
+enum qla_work_type {
+        QLA_EVT_AEN,
+};
+
+
+struct qla_work_evt {
+        struct list_head        list;
+        enum qla_work_type      type;
+        u32                     flags;
+#define QLA_EVT_FLAG_FREE       0x1
+
+        union {
+                struct {
+                        enum fc_host_event_code code;
+                        u32 data;
+                } aen;
+        } u;
+};
+
 /*
  * Linux Host Adapter structure
  */
@@ -2354,6 +2374,8 @@ typedef struct scsi_qla_host {
         uint32_t        login_retry_count;
         int             max_q_depth;
 
+        struct list_head        work_list;
+
         /* Fibre Channel Device List. */
         struct list_head        fcports;