1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index c090df442572..6f9457a75b8f 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -124,6 +124,23 @@ struct rpc_xprt_ops {
         void            (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
 };
 
+/*
+ * RPC transport identifiers
+ *
+ * To preserve compatibility with the historical use of raw IP protocol
+ * id's for transport selection, UDP and TCP identifiers are specified
+ * with the previous values. No such restriction exists for new transports,
+ * except that they may not collide with these values (17 and 6,
+ * respectively).
+ */
+#define XPRT_TRANSPORT_BC       (1 << 31)
+enum xprt_transports {
+        XPRT_TRANSPORT_UDP      = IPPROTO_UDP,
+        XPRT_TRANSPORT_TCP      = IPPROTO_TCP,
+        XPRT_TRANSPORT_BC_TCP   = IPPROTO_TCP | XPRT_TRANSPORT_BC,
+        XPRT_TRANSPORT_RDMA     = 256
+};
+
 struct rpc_xprt {
         struct kref             kref;           /* Reference count */
         struct rpc_xprt_ops *   ops;            /* transport methods */
@@ -179,6 +196,7 @@ struct rpc_xprt {
         spinlock_t              reserve_lock;   /* lock slot table */
         u32                     xid;            /* Next XID value to use */
         struct rpc_task *       snd_task;       /* Task blocked in send */
+        struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
 #if defined(CONFIG_NFS_V4_1)
         struct svc_serv         *bc_serv;       /* The RPC service which will */
                                                 /* process the callback */
@@ -231,6 +249,7 @@ struct xprt_create {
         struct sockaddr *       srcaddr;        /* optional local address */
         struct sockaddr *       dstaddr;        /* remote peer address */
         size_t                  addrlen;
+        struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
 };
 
 struct xprt_class {