Linux-libre 4.7.1-gnupck-4.7.1-gnu

1 files changed, 16 insertions, 0 deletions

diff --git a/net/sunrpc/xprtrdma/backchannel.c b/net/sunrpc/xprtrdma/backchannel.c
index 2dcd7640e..87762d976 100644
--- a/net/sunrpc/xprtrdma/backchannel.c
+++ b/net/sunrpc/xprtrdma/backchannel.c
@@ -192,6 +192,22 @@ int xprt_rdma_bc_up(struct svc_serv *serv, struct net *net)
 }
 
 /**
+ * xprt_rdma_bc_maxpayload - Return maximum backchannel message size
+ * @xprt: transport
+ *
+ * Returns maximum size, in bytes, of a backchannel message
+ */
+size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *xprt)
+{
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
+	size_t maxmsg;
+
+	maxmsg = min_t(unsigned int, cdata->inline_rsize, cdata->inline_wsize);
+	return maxmsg - RPCRDMA_HDRLEN_MIN;
+}
+
+/**
  * rpcrdma_bc_marshal_reply - Send backwards direction reply
  * @rqst: buffer containing RPC reply data
  *