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Commit fb14ae88 authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
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xprtrdma: "Support" call-only RPCs 



RPC-over-RDMA version 1 credit accounting relies on there being a
response message for every RPC Call. This means that RPC procedures
that have no reply will disrupt credit accounting, just in the same
way as a retransmit would (since it is sent because no reply has
arrived). Deal with the "no reply" case the same way.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent ae741a85

include/linux/sunrpc/clnt.h

+7 −0
Original line number Diff line number Diff line
@@ -217,5 +217,12 @@ void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *, struct rpc_xprt *); 
bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,

			const struct sockaddr *sap);

void rpc_cleanup_clids(void);



static inline int rpc_reply_expected(struct rpc_task *task)

{

	return (task->tk_msg.rpc_proc != NULL) &&

		(task->tk_msg.rpc_proc->p_decode != NULL);

}



#endif /* __KERNEL__ */

#endif /* _LINUX_SUNRPC_CLNT_H */

net/sunrpc/sunrpc.h

+0 −6
Original line number Diff line number Diff line
@@ -37,12 +37,6 @@ struct rpc_buffer { 
	char	data[];

};



static inline int rpc_reply_expected(struct rpc_task *task)

{

	return (task->tk_msg.rpc_proc != NULL) &&

		(task->tk_msg.rpc_proc->p_decode != NULL);

}



static inline int sock_is_loopback(struct sock *sk)

{

	struct dst_entry *dst;

net/sunrpc/xprtrdma/transport.c

+6 −0
Original line number Diff line number Diff line
@@ -728,6 +728,12 @@ xprt_rdma_send_request(struct rpc_task *task) 


	rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;

	rqst->rq_bytes_sent = 0;



	/* An RPC with no reply will throw off credit accounting,

	 * so drop the connection to reset the credit grant.

	 */

	if (!rpc_reply_expected(task))

		goto drop_connection;

	return 0;



failed_marshal: