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, 1 insertions, 0 deletions

diff --git a/include/linux/rds.h b/include/linux/rds.h
index 9239152abf7a..109f1d343318 100644
--- a/include/linux/rds.h
+++ b/include/linux/rds.h
@@ -276,5 +276,6 @@ struct rds_rdma_notify {
 #define RDS_RDMA_USE_ONCE       0x0008  /* free MR after use */
 #define RDS_RDMA_DONTWAIT       0x0010  /* Don't wait in SET_BARRIER */
 #define RDS_RDMA_NOTIFY_ME      0x0020  /* Notify when operation completes */
+#define RDS_RDMA_SILENT         0x0040  /* Do not interrupt remote */
 
 #endif /* IB_RDS_H */