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authorChuck Lever <chuck.lever@oracle.com>2016-05-02 21:40:40 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2016-05-17 22:47:57 +0300
commit6b26cc8c8ead3636a18bfd9489984983f4ddd6f4 (patch)
treea568d97b3fea0065f56122b1652ecc7748fa1da5 /net/sunrpc/clnt.c
parent4b9c7f9db9a003f5c342184dc4401c1b7f2efb39 (diff)
downloadlinux-6b26cc8c8ead3636a18bfd9489984983f4ddd6f4.tar.xz
sunrpc: Advertise maximum backchannel payload size
RPC-over-RDMA transports have a limit on how large a backward direction (backchannel) RPC message can be. Ensure that the NFSv4.x CREATE_SESSION operation advertises this limit to servers. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Tested-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc/clnt.c')
-rw-r--r--net/sunrpc/clnt.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 7e0c9bf22df8..06b4df9faaa1 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1414,6 +1414,23 @@ size_t rpc_max_payload(struct rpc_clnt *clnt)
EXPORT_SYMBOL_GPL(rpc_max_payload);
/**
+ * rpc_max_bc_payload - Get maximum backchannel payload size, in bytes
+ * @clnt: RPC client to query
+ */
+size_t rpc_max_bc_payload(struct rpc_clnt *clnt)
+{
+ struct rpc_xprt *xprt;
+ size_t ret;
+
+ rcu_read_lock();
+ xprt = rcu_dereference(clnt->cl_xprt);
+ ret = xprt->ops->bc_maxpayload(xprt);
+ rcu_read_unlock();
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rpc_max_bc_payload);
+
+/**
* rpc_get_timeout - Get timeout for transport in units of HZ
* @clnt: RPC client to query
*/