svcrdma: Post Receives only for forward channel requests

Since backward direction support was added, the rq_depth was
increased to accommodate both forward and backward Receives.

But only forward Receives need to be posted after a connection
has been accepted. Receives for backward replies are posted as
needed by svc_rdma_bc_sendto().

This doesn't break anything, but it means some resources are
wasted.

Fixes: 03fe9931 ('svcrdma: Define maximum number of ...')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

net/sunrpc/xprtrdma/svc_rdma_transport.c

@@ -1083,7 +1083,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 		newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV;
 
 	/* Post receive buffers */
-	for (i = 0; i < newxprt->sc_rq_depth; i++) {
+	for (i = 0; i < newxprt->sc_max_requests; i++) {
 		ret = svc_rdma_post_recv(newxprt, GFP_KERNEL);
 		if (ret) {
 			dprintk("svcrdma: failure posting receive buffers\n");