RDS: Add flag for silent ops. Do atomic op before RDMA

Add a flag to the API so users can indicate they want
silent operations. This is needed because silent ops
cannot be used with USE_ONCE MRs, so we can't just
assume silent.

Also, change send_xmit to do atomic op before rdma op if
both are present, and centralize the hairy logic to determine if
we want to attempt silent, or not.

Signed-off-by: Andy Grover <andy.grover@oracle.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/rds/rds.h b/net/rds/rds.h
index 46d190d0854..23b921000e7 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -319,6 +319,7 @@ struct rds_message {
                         unsigned int            op_notify:1;
                         unsigned int            op_recverr:1;
                         unsigned int            op_mapped:1;
+                        unsigned int            op_silent:1;
                         unsigned int            op_active:1;
                         struct scatterlist      *op_sg;
                         struct rds_notifier     *op_notifier;
@@ -333,6 +334,7 @@ struct rds_message {
                         unsigned int            op_notify:1;
                         unsigned int            op_recverr:1;
                         unsigned int            op_mapped:1;
+                        unsigned int            op_silent:1;
                         unsigned int            op_active:1;
                         unsigned int            op_bytes;
                         unsigned int            op_nents;