[SCSI] iscsi: add transport end point callbacks

add transport end point callbacks so iscsi drivers that cannot connect
from userspace, like iscsi tcp, using sockets do not have to
implement their own socket infrastructure.

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

4 files changed, 65 insertions, 5 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index fe00a3f6d204..ac507daacfeb 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -1975,7 +1975,7 @@ iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
 
 static int
 iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
-                    struct iscsi_cls_conn *cls_conn, uint32_t transport_fd,
+                    struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
                     int is_leading)
 {
         struct iscsi_conn *conn = cls_conn->dd_data;
@@ -1985,7 +1985,7 @@ iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
         int err;
 
         /* lookup for existing socket */
-        sock = sockfd_lookup(transport_fd, &err);
+        sock = sockfd_lookup((int)transport_eph, &err);
         if (!sock) {
                 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
                 return -EEXIST;
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index bc9071d2d212..7b7a194822da 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -929,6 +929,40 @@ iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
 }
 
 static int
+iscsi_if_transport_ep(struct iscsi_transport *transport,
+                      struct iscsi_uevent *ev, int msg_type)
+{
+        struct sockaddr *dst_addr;
+        int rc = 0;
+
+        switch (msg_type) {
+        case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
+                if (!transport->ep_connect)
+                        return -EINVAL;
+
+                dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
+                rc = transport->ep_connect(dst_addr,
+                                           ev->u.ep_connect.non_blocking,
+                                           &ev->r.ep_connect_ret.handle);
+                break;
+        case ISCSI_UEVENT_TRANSPORT_EP_POLL:
+                if (!transport->ep_poll)
+                        return -EINVAL;
+
+                ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle,
+                                                   ev->u.ep_poll.timeout_ms);
+                break;
+        case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
+                if (!transport->ep_disconnect)
+                        return -EINVAL;
+
+                transport->ep_disconnect(ev->u.ep_disconnect.ep_handle);
+                break;
+        }
+        return rc;
+}
+
+static int
 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 {
         int err = 0;
@@ -974,7 +1008,7 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 
                 if (session && conn)
                         ev->r.retcode = transport->bind_conn(session, conn,
-                                        ev->u.b_conn.transport_fd,
+                                        ev->u.b_conn.transport_eph,
                                         ev->u.b_conn.is_leading);
                 else
                         err = -EINVAL;
@@ -1009,6 +1043,11 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
         case ISCSI_UEVENT_GET_STATS:
                 err = iscsi_if_get_stats(transport, nlh);
                 break;
+        case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
+        case ISCSI_UEVENT_TRANSPORT_EP_POLL:
+        case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
+                err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
+                break;
         default:
                 err = -EINVAL;
                 break;
diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index 47524c726ee8..feff74e544b7 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -43,6 +43,10 @@ enum iscsi_uevent_e {
         ISCSI_UEVENT_GET_STATS          = UEVENT_BASE + 10,
         ISCSI_UEVENT_GET_PARAM          = UEVENT_BASE + 11,
 
+        ISCSI_UEVENT_TRANSPORT_EP_CONNECT       = UEVENT_BASE + 12,
+        ISCSI_UEVENT_TRANSPORT_EP_POLL          = UEVENT_BASE + 13,
+        ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT    = UEVENT_BASE + 14,
+
         /* up events */
         ISCSI_KEVENT_RECV_PDU           = KEVENT_BASE + 1,
         ISCSI_KEVENT_CONN_ERROR         = KEVENT_BASE + 2,
@@ -69,7 +73,7 @@ struct iscsi_uevent {
                 struct msg_bind_conn {
                         uint32_t        sid;
                         uint32_t        cid;
-                        uint32_t        transport_fd;
+                        uint64_t        transport_eph;
                         uint32_t        is_leading;
                 } b_conn;
                 struct msg_destroy_conn {
@@ -102,6 +106,16 @@ struct iscsi_uevent {
                         uint32_t        sid;
                         uint32_t        cid;
                 } get_stats;
+                struct msg_transport_connect {
+                        uint32_t        non_blocking;
+                } ep_connect;
+                struct msg_transport_poll {
+                        uint64_t        ep_handle;
+                        uint32_t        timeout_ms;
+                } ep_poll;
+                struct msg_transport_disconnect {
+                        uint64_t        ep_handle;
+                } ep_disconnect;
         } u;
         union {
                 /* messages k -> u */
@@ -124,6 +138,9 @@ struct iscsi_uevent {
                         uint32_t        cid;
                         uint32_t        error; /* enum iscsi_err */
                 } connerror;
+                struct msg_transport_connect_ret {
+                        uint64_t        handle;
+                } ep_connect_ret;
         } r;
 } __attribute__ ((aligned (sizeof(uint64_t))));
 
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index b332d6e839fe..c9e9475c6dff 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -88,7 +88,7 @@ struct iscsi_transport {
                                 uint32_t cid);
         int (*bind_conn) (struct iscsi_cls_session *session,
                           struct iscsi_cls_conn *cls_conn,
-                          uint32_t transport_fd, int is_leading);
+                          uint64_t transport_eph, int is_leading);
         int (*start_conn) (struct iscsi_cls_conn *conn);
         void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
         void (*destroy_conn) (struct iscsi_cls_conn *conn);
@@ -119,6 +119,10 @@ struct iscsi_transport {
         int (*xmit_mgmt_task) (struct iscsi_conn *conn,
                                struct iscsi_mgmt_task *mtask);
         void (*session_recovery_timedout) (struct iscsi_cls_session *session);
+        int (*ep_connect) (struct sockaddr *dst_addr, int non_blocking,
+                           uint64_t *ep_handle);
+        int (*ep_poll) (uint64_t ep_handle, int timeout_ms);
+        void (*ep_disconnect) (uint64_t ep_handle);
 };
 
 /*