Allow upper layers to determine if a particular rpc_clnt is prepared
to provide a backchannel RPC service.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
include/linux/sunrpc/clnt.h | 1 +
include/linux/sunrpc/xprt.h | 1 +
net/sunrpc/clnt.c | 24 ++++++++++++++++++++++++
net/sunrpc/xprtsock.c | 3 +++
4 files changed, 29 insertions(+)
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index 70736b9..644c751 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -171,6 +171,7 @@ int rpc_protocol(struct rpc_clnt *);
struct net * rpc_net_ns(struct rpc_clnt *);
size_t rpc_max_payload(struct rpc_clnt *);
unsigned long rpc_get_timeout(struct rpc_clnt *clnt);
+bool rpc_xprt_is_bidirectional(struct rpc_clnt *);
void rpc_force_rebind(struct rpc_clnt *);
size_t rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
const char *rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index 632685c..4dea441 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -218,6 +218,7 @@ struct rpc_xprt {
* items */
struct list_head bc_pa_list; /* List of preallocated
* backchannel rpc_rqst's */
+ bool bc_supported;
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
struct list_head recv;
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 5e817d6..1793341 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1347,6 +1347,30 @@ unsigned long rpc_get_timeout(struct rpc_clnt *clnt)
EXPORT_SYMBOL_GPL(rpc_get_timeout);
/**
+ * rpc_xprt_is_bidirectional
+ * @clnt: RPC clnt to query
+ *
+ * Returns true if underlying transport supports backchannel service.
+ */
+#ifdef CONFIG_SUNRPC_BACKCHANNEL
+bool rpc_xprt_is_bidirectional(struct rpc_clnt *clnt)
+{
+ bool ret;
+
+ rcu_read_lock();
+ ret = rcu_dereference(clnt->cl_xprt)->bc_supported;
+ rcu_read_unlock();
+ return ret;
+}
+#else
+bool rpc_xprt_is_bidirectional(struct rpc_clnt *clnt)
+{
+ return false;
+}
+#endif
+EXPORT_SYMBOL_GPL(rpc_xprt_is_bidirectional);
+
+/**
* rpc_force_rebind - force transport to check that remote port is unchanged
* @clnt: client to rebind
*
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index b4aca48..e2e15a9 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2864,6 +2864,9 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
xprt->ops = &xs_tcp_ops;
xprt->timeout = &xs_tcp_default_timeout;
+#ifdef CONFIG_SUNRPC_BACKCHANNEL
+ xprt->bc_supported = true;
+#endif
switch (addr->sa_family) {
case AF_INET:
--
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