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>
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 48781fe..4806467 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -738,13 +738,34 @@
args = CMSG_DATA(cmsg);
- if (cmsg->cmsg_type == RDS_CMSG_ATOMIC_CSWP) {
- rm->atomic.op_type = RDS_ATOMIC_TYPE_CSWP;
- rm->atomic.op_swap_add = args->cswp.swap;
- rm->atomic.op_compare = args->cswp.compare;
- } else {
+ /* Nonmasked & masked cmsg ops converted to masked hw ops */
+ switch (cmsg->cmsg_type) {
+ case RDS_CMSG_ATOMIC_FADD:
rm->atomic.op_type = RDS_ATOMIC_TYPE_FADD;
- rm->atomic.op_swap_add = args->fadd.add;
+ rm->atomic.op_m_fadd.add = args->fadd.add;
+ rm->atomic.op_m_fadd.nocarry_mask = 0;
+ break;
+ case RDS_CMSG_MASKED_ATOMIC_FADD:
+ rm->atomic.op_type = RDS_ATOMIC_TYPE_FADD;
+ rm->atomic.op_m_fadd.add = args->m_fadd.add;
+ rm->atomic.op_m_fadd.nocarry_mask = args->m_fadd.nocarry_mask;
+ break;
+ case RDS_CMSG_ATOMIC_CSWP:
+ rm->atomic.op_type = RDS_ATOMIC_TYPE_CSWP;
+ rm->atomic.op_m_cswp.compare = args->cswp.compare;
+ rm->atomic.op_m_cswp.swap = args->cswp.swap;
+ rm->atomic.op_m_cswp.compare_mask = ~0;
+ rm->atomic.op_m_cswp.swap_mask = ~0;
+ break;
+ case RDS_CMSG_MASKED_ATOMIC_CSWP:
+ rm->atomic.op_type = RDS_ATOMIC_TYPE_CSWP;
+ rm->atomic.op_m_cswp.compare = args->m_cswp.compare;
+ rm->atomic.op_m_cswp.swap = args->m_cswp.swap;
+ rm->atomic.op_m_cswp.compare_mask = args->m_cswp.compare_mask;
+ rm->atomic.op_m_cswp.swap_mask = args->m_cswp.swap_mask;
+ break;
+ default:
+ BUG(); /* should never happen */
}
rm->atomic.op_notify = !!(args->flags & RDS_RDMA_NOTIFY_ME);