IB{cm, core}: Introduce and use ah_attr copy, move, replace APIs

Introduce AH attribute copy, move and replace APIs to be used by core and
provider drivers.

In CM code flow when ah attribute might be re-initialized twice while
processing incoming request, or initialized once while from path record
while sending out CM requests. Therefore use rdma_move_ah_attr API to
handle such scenarios instead of memcpy().

Provider drivers keeps a copy ah_attr during the lifetime of the ah.
Therefore, use rdma_replace_ah_attr() which conditionally release
reference to old ah_attr and holds reference to new attribute whose
referrence is released when the AH is freed.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index a3a4b8335668..1e5c1e8ba282 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -4034,6 +4034,11 @@ void rdma_destroy_ah_attr(struct rdma_ah_attr *ah_attr);
 void rdma_move_grh_sgid_attr(struct rdma_ah_attr *attr, union ib_gid *dgid,
 			     u32 flow_label, u8 hop_limit, u8 traffic_class,
 			     const struct ib_gid_attr *sgid_attr);
+void rdma_copy_ah_attr(struct rdma_ah_attr *dest,
+		       const struct rdma_ah_attr *src);
+void rdma_replace_ah_attr(struct rdma_ah_attr *old,
+			  const struct rdma_ah_attr *new);
+void rdma_move_ah_attr(struct rdma_ah_attr *dest, struct rdma_ah_attr *src);
 
 /**
  * rdma_ah_find_type - Return address handle type.