[SCSI] iscsi: add target discvery event to transport class

Patch from david.somayajulu@qlogic.com:

Add target discovery event. We may have a setup where the iscsi traffic
is on a different netowrk than the other network traffic. In this case
we will want to do discovery though the iscsi card. This patch adds
a event to the transport class that can be used by hw iscsi cards that
support this.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index 253797c6009..8813f0f4c62 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -47,12 +47,20 @@ enum iscsi_uevent_e {
 	ISCSI_UEVENT_TRANSPORT_EP_POLL		= UEVENT_BASE + 13,
 	ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT	= UEVENT_BASE + 14,
 
+	ISCSI_UEVENT_TGT_DSCVR		= UEVENT_BASE + 15,
+
 	/* up events */
 	ISCSI_KEVENT_RECV_PDU		= KEVENT_BASE + 1,
 	ISCSI_KEVENT_CONN_ERROR		= KEVENT_BASE + 2,
 	ISCSI_KEVENT_IF_ERROR		= KEVENT_BASE + 3,
 };
 
+enum iscsi_tgt_dscvr {
+	ISCSI_TGT_DSCVR_SEND_TARGETS	= 1,
+	ISCSI_TGT_DSCVR_ISNS		= 2,
+	ISCSI_TGT_DSCVR_SLP		= 3,
+};
+
 struct iscsi_uevent {
 	uint32_t type; /* k/u events type */
 	uint32_t iferror; /* carries interface or resource errors */
@@ -116,6 +124,17 @@ struct iscsi_uevent {
 		struct msg_transport_disconnect {
 			uint64_t	ep_handle;
 		} ep_disconnect;
+		struct msg_tgt_dscvr {
+			enum iscsi_tgt_dscvr	type;
+			uint32_t	host_no;
+			/*
+ 			 * enable = 1 to establish a new connection
+			 * with the server. enable = 0 to disconnect
+			 * from the server. Used primarily to switch
+			 * from one iSNS server to another.
+			 */
+			uint32_t	enable;
+		} tgt_dscvr;
 	} u;
 	union {
 		/* messages k -> u */
@@ -141,6 +160,24 @@ struct iscsi_uevent {
 		struct msg_transport_connect_ret {
 			uint64_t	handle;
 		} ep_connect_ret;
+		struct msg_tgt_dscvr_ret {
+			/*
+			 * session/connection pair used to reference
+			 * the connection to server
+			 */
+			uint32_t	sid;
+			uint32_t	cid;
+			union {
+				struct isns {
+					/* port # for conn to iSNS server */
+					uint16_t isns_port;
+					/* listening port to receive SCNs */
+					uint16_t scn_port;
+					/* listening port to receive ESIs */
+					uint16_t esi_port;
+				} isns_attrib;
+			} u;
+		} tgt_dscvr_ret;
 	} r;
 } __attribute__ ((aligned (sizeof(uint64_t))));