RPCRDMA_BACKWARD_WRS
if (xprt->bc_alloc_count >= RPCRDMA_BACKWARD_WRS)
r_xprt->rx_buf.rb_bc_srv_max_requests = RPCRDMA_BACKWARD_WRS >> 1;
return RPCRDMA_BACKWARD_WRS >> 1;
max_qp_wr -= RPCRDMA_BACKWARD_WRS;
ep->re_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
ep->re_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;