IB: Change CQE "csum_ok" field to a bit flag

Use a bit in wc_flags rather then a whole integer to hold the
"checksum OK" flag.  By itself, this change doesn't reduce the size of
struct ib_wc on 64bit machines -- it stays on 56 bytes because of
padding.  However, it will allow to add more fields in the future
without enlarging the struct.  Also, it will let us have a unified
approach with future libibverbs checksum offload reporting, because a
bit flag doesn't break the library ABI.

This patch was suggested during conversation with Liran Liss
<liranl@mellanox.com>.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index ff22a73e0937..c3cca5a4dacd 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -518,6 +518,7 @@ enum ib_wc_flags {
         IB_WC_GRH               = 1,
         IB_WC_WITH_IMM          = (1<<1),
         IB_WC_WITH_INVALIDATE   = (1<<2),
+        IB_WC_IP_CSUM_OK        = (1<<3),
 };
 
 struct ib_wc {
@@ -538,7 +539,6 @@ struct ib_wc {
         u8                      sl;
         u8                      dlid_path_bits;
         u8                      port_num;       /* valid only for DR SMPs on switches */
-        int                     csum_ok;
 };
 
 enum ib_cq_notify_flags {