xprtrdma: Clean up the post_send path

Clean up: Simplify the synopses of functions in the post_send path
by combining the struct rpcrdma_ia and struct rpcrdma_ep arguments.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/xprtrdma/backchannel.c

@@ -115,7 +115,7 @@ int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst)
 	if (rc < 0)
 		goto failed_marshal;
 
-	if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
+	if (rpcrdma_post_sends(r_xprt, req))
 		goto drop_connection;
 	return 0;
 

net/sunrpc/xprtrdma/frwr_ops.c

@@ -374,18 +374,22 @@ static void frwr_wc_fastreg(struct ib_cq *cq, struct ib_wc *wc)
 }
 
 /**
- * frwr_send - post Send WR containing the RPC Call message
- * @ia: interface adapter
- * @req: Prepared RPC Call
+ * frwr_send - post Send WRs containing the RPC Call message
+ * @r_xprt: controlling transport instance
+ * @req: prepared RPC Call
  *
  * For FRWR, chain any FastReg WRs to the Send WR. Only a
  * single ib_post_send call is needed to register memory
  * and then post the Send WR.
  *
- * Returns the result of ib_post_send.
+ * Returns the return code from ib_post_send.
+ *
+ * Caller must hold the transport send lock to ensure that the
+ * pointers to the transport's rdma_cm_id and QP are stable.
  */
-int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
+int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
 {
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
 	struct ib_send_wr *post_wr;
 	struct rpcrdma_mr *mr;
 

net/sunrpc/xprtrdma/transport.c

@@ -688,7 +688,7 @@ xprt_rdma_send_request(struct rpc_rqst *rqst)
 		goto drop_connection;
 	rqst->rq_xtime = ktime_get();
 
-	if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
+	if (rpcrdma_post_sends(r_xprt, req))
 		goto drop_connection;
 
 	rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;

net/sunrpc/xprtrdma/verbs.c

@@ -1461,20 +1461,17 @@ static void rpcrdma_regbuf_free(struct rpcrdma_regbuf *rb)
 }
 
 /**
- * rpcrdma_ep_post - Post WRs to a transport's Send Queue
- * @ia: transport's device information
- * @ep: transport's RDMA endpoint information
+ * rpcrdma_post_sends - Post WRs to a transport's Send Queue
+ * @r_xprt: controlling transport instance
  * @req: rpcrdma_req containing the Send WR to post
  *
  * Returns 0 if the post was successful, otherwise -ENOTCONN
  * is returned.
  */
-int
-rpcrdma_ep_post(struct rpcrdma_ia *ia,
-		struct rpcrdma_ep *ep,
-		struct rpcrdma_req *req)
+int rpcrdma_post_sends(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
 {
 	struct ib_send_wr *send_wr = &req->rl_wr;
+	struct rpcrdma_ep *ep = &r_xprt->rx_ep;
 	int rc;
 
 	if (!ep->rep_send_count || kref_read(&req->rl_kref) > 1) {
@@ -1485,7 +1482,7 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
 		--ep->rep_send_count;
 	}
 
-	rc = frwr_send(ia, req);
+	rc = frwr_send(r_xprt, req);
 	trace_xprtrdma_post_send(req, rc);
 	if (rc)
 		return -ENOTCONN;

net/sunrpc/xprtrdma/xprt_rdma.h

@@ -467,8 +467,7 @@ void rpcrdma_ia_close(struct rpcrdma_ia *);
 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
 
-int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
-				struct rpcrdma_req *);
+int rpcrdma_post_sends(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
 void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp);
 
 /*
@@ -542,7 +541,7 @@ struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
 				struct rpcrdma_mr_seg *seg,
 				int nsegs, bool writing, __be32 xid,
 				struct rpcrdma_mr *mr);
-int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req);
+int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs);
 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
 void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);