svcrdma: Add @rctxt parameter to svc_rdma_send_error() functions

Another step towards making svc_rdma_send_error_msg() and
svc_rdma_send_error() similar enough to eliminate one of them.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c

@@ -715,10 +715,11 @@ static void rdma_read_complete(struct svc_rqst *rqstp,
 }
 
 static void svc_rdma_send_error(struct svcxprt_rdma *xprt,
-				__be32 *rdma_argp, int status)
+				struct svc_rdma_recv_ctxt *rctxt,
+				int status)
 {
+	__be32 *p, *rdma_argp = rctxt->rc_recv_buf;
 	struct svc_rdma_send_ctxt *ctxt;
-	__be32 *p;
 	int ret;
 
 	ctxt = svc_rdma_send_ctxt_get(xprt);
@@ -900,13 +901,13 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
 	return 0;
 
 out_err:
-	svc_rdma_send_error(rdma_xprt, p, ret);
+	svc_rdma_send_error(rdma_xprt, ctxt, ret);
 	svc_rdma_recv_ctxt_put(rdma_xprt, ctxt);
 	return 0;
 
 out_postfail:
 	if (ret == -EINVAL)
-		svc_rdma_send_error(rdma_xprt, p, ret);
+		svc_rdma_send_error(rdma_xprt, ctxt, ret);
 	svc_rdma_recv_ctxt_put(rdma_xprt, ctxt);
 	return ret;
 

net/sunrpc/xprtrdma/svc_rdma_sendto.c

@@ -811,18 +811,17 @@ static int svc_rdma_send_reply_msg(struct svcxprt_rdma *rdma,
  * Remote Invalidation is skipped for simplicity.
  */
 static int svc_rdma_send_error_msg(struct svcxprt_rdma *rdma,
-				   struct svc_rdma_send_ctxt *ctxt,
-				   struct svc_rqst *rqstp)
+				   struct svc_rdma_send_ctxt *sctxt,
+				   struct svc_rdma_recv_ctxt *rctxt)
 {
-	struct svc_rdma_recv_ctxt *rctxt = rqstp->rq_xprt_ctxt;
 	__be32 *rdma_argp = rctxt->rc_recv_buf;
 	__be32 *p;
 
-	rpcrdma_set_xdrlen(&ctxt->sc_hdrbuf, 0);
-	xdr_init_encode(&ctxt->sc_stream, &ctxt->sc_hdrbuf, ctxt->sc_xprt_buf,
-			NULL);
+	rpcrdma_set_xdrlen(&sctxt->sc_hdrbuf, 0);
+	xdr_init_encode(&sctxt->sc_stream, &sctxt->sc_hdrbuf,
+			sctxt->sc_xprt_buf, NULL);
 
-	p = xdr_reserve_space(&ctxt->sc_stream, RPCRDMA_HDRLEN_ERR);
+	p = xdr_reserve_space(&sctxt->sc_stream, RPCRDMA_HDRLEN_ERR);
 	if (!p)
 		return -ENOMSG;
 
@@ -833,10 +832,10 @@ static int svc_rdma_send_error_msg(struct svcxprt_rdma *rdma,
 	*p   = err_chunk;
 	trace_svcrdma_err_chunk(*rdma_argp);
 
-	ctxt->sc_send_wr.num_sge = 1;
-	ctxt->sc_send_wr.opcode = IB_WR_SEND;
-	ctxt->sc_sges[0].length = ctxt->sc_hdrbuf.len;
-	return svc_rdma_send(rdma, &ctxt->sc_send_wr);
+	sctxt->sc_send_wr.num_sge = 1;
+	sctxt->sc_send_wr.opcode = IB_WR_SEND;
+	sctxt->sc_sges[0].length = sctxt->sc_hdrbuf.len;
+	return svc_rdma_send(rdma, &sctxt->sc_send_wr);
 }
 
 /**
@@ -931,7 +930,7 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
 	 * of previously posted RDMA Writes.
 	 */
 	svc_rdma_save_io_pages(rqstp, sctxt);
-	ret = svc_rdma_send_error_msg(rdma, sctxt, rqstp);
+	ret = svc_rdma_send_error_msg(rdma, sctxt, rctxt);
 	if (ret < 0)
 		goto err1;
 	return 0;