[SCSI] scsi_transport_iscsi: added support for host event

Added support to post kernel host event to application using
netlink interface.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 19 insertions, 0 deletions

diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index e49b7c8dd217..3aac99155e80 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -72,6 +72,7 @@ enum iscsi_uevent_e {
         ISCSI_KEVENT_PATH_REQ           = KEVENT_BASE + 7,
         ISCSI_KEVENT_IF_DOWN            = KEVENT_BASE + 8,
         ISCSI_KEVENT_CONN_LOGIN_STATE   = KEVENT_BASE + 9,
+        ISCSI_KEVENT_HOST_EVENT         = KEVENT_BASE + 10,
 };
 
 enum iscsi_tgt_dscvr {
@@ -80,6 +81,13 @@ enum iscsi_tgt_dscvr {
         ISCSI_TGT_DSCVR_SLP             = 3,
 };
 
+enum iscsi_host_event_code {
+        ISCSI_EVENT_LINKUP              = 1,
+        ISCSI_EVENT_LINKDOWN,
+        /* must always be last */
+        ISCSI_EVENT_MAX,
+};
+
 struct iscsi_uevent {
         uint32_t type; /* k/u events type */
         uint32_t iferror; /* carries interface or resource errors */
@@ -222,6 +230,11 @@ struct iscsi_uevent {
                 struct msg_notify_if_down {
                         uint32_t        host_no;
                 } notify_if_down;
+                struct msg_host_event {
+                        uint32_t        host_no;
+                        uint32_t        data_size;
+                        enum iscsi_host_event_code code;
+                } host_event;
         } r;
 } __attribute__ ((aligned (sizeof(uint64_t))));
 
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index fa7ca4e16020..7f047314281b 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -166,6 +166,12 @@ extern int iscsi_offload_mesg(struct Scsi_Host *shost,
                               struct iscsi_transport *transport, uint32_t type,
                               char *data, uint16_t data_size);
 
+extern void iscsi_post_host_event(uint32_t host_no,
+                                  struct iscsi_transport *transport,
+                                  enum iscsi_host_event_code code,
+                                  uint32_t data_size,
+                                  uint8_t *data);
+
 struct iscsi_cls_conn {
         struct list_head conn_list;     /* item in connlist */
         void *dd_data;                  /* LLD private data */