RDS: Implement masked atomic operations

Add two CMSGs for masked versions of cswp and fadd. args
struct modified to use a union for different atomic op type's
arguments. Change IB to do masked atomic ops. Atomic op type
in rds_message similarly unionized.

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

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/rds.h b/include/linux/rds.h
index 109f1d343318..a2a5edb4a276 100644
--- a/include/linux/rds.h
+++ b/include/linux/rds.h
@@ -75,6 +75,8 @@
 #define RDS_CMSG_CONG_UPDATE            5
 #define RDS_CMSG_ATOMIC_FADD            6
 #define RDS_CMSG_ATOMIC_CSWP            7
+#define RDS_CMSG_MASKED_ATOMIC_FADD     8
+#define RDS_CMSG_MASKED_ATOMIC_CSWP     9
 
 #define RDS_INFO_FIRST                  10000
 #define RDS_INFO_COUNTERS               10000
@@ -251,6 +253,16 @@ struct rds_atomic_args {
                 struct {
                         uint64_t        add;
                 } fadd;
+                struct {
+                        uint64_t        compare;
+                        uint64_t        swap;
+                        uint64_t        compare_mask;
+                        uint64_t        swap_mask;
+                } m_cswp;
+                struct {
+                        uint64_t        add;
+                        uint64_t        nocarry_mask;
+                } m_fadd;
         };
         uint64_t        flags;
         uint64_t        user_token;