svcrdma: Modify the RPC reply path to use FRMR when available

Use FRMR to map local RPC reply data. This allows RDMA_WRITE to send reply
data using a single WR. The FRMR is invalidated by linking the LOCAL_INV WR
to the RDMA_SEND message used to complete the reply.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index fb0dff5e53ea..98f945c5a007 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -335,6 +335,8 @@ static void process_context(struct svcxprt_rdma *xprt,
 
         switch (ctxt->wr_op) {
         case IB_WR_SEND:
+                if (test_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags))
+                        svc_rdma_put_frmr(xprt, ctxt->frmr);
                 svc_rdma_put_context(ctxt, 1);
                 break;