commit ed6a98208e04be9401eb727b57e78a29eecbe660
Author: Michael J. Ruhl <michael.j.ruhl@intel.com>
Date:   Mon Oct 16 10:24:21 2017 -0400

    ibacm: Incorrect usage of BE byte order of MLID attach/detach_mcast()
    
    The MLID value passed to ibv_attach/detach_mcast() must be in host
    byte order.
    
    acmp.c incorrectly uses the big endian format when doing a multicast
    attach/detach (join). Multicast packets are used to do name resolution
    by the libibacmp library.
    
    There are two possible results because of this issue.
    
    If a kernel has commit 8561eae60ff9, the attach will fail with an
    EINVAL.  ibacm will log this as a failure during the multicast join.
    
    If a kernel does not have commit 8561eae60ff9, the attach will
    complete successfully.  Packets sent to this address will be dropped
    because the packet dlid value and the multicast address information
    given by the attach will not match.
    
    Update MLID usage to use the correct byte order.
    
    Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
    Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>

diff --git ibacm/prov/acmp/src/acmp.c ibacm/prov/acmp/src/acmp.c
index aa784166..78d9a295 100644
--- ibacm/prov/acmp/src/acmp.c
+++ ibacm/prov/acmp/src/acmp.c
@@ -732,7 +732,7 @@ static void acmp_process_join_resp(struct acm_sa_mad *sa_mad)
 			acm_log(0, "ERROR - unable to create ah\n");
 			goto out;
 		}
-		ret = ibv_attach_mcast(ep->qp, &mc_rec->mgid, mc_rec->mlid);
+		ret = ibv_attach_mcast(ep->qp, &dest->mgid, dest->av.dlid);
 		if (ret) {
 			acm_log(0, "ERROR - unable to attach QP to multicast group\n");
 			ibv_destroy_ah(dest->ah);
@@ -1429,7 +1429,7 @@ static void acmp_ep_join(struct acmp_ep *ep)
 
 	if (ep->mc_dest[0].state == ACMP_READY && ep->mc_dest[0].ah) {
 		ibv_detach_mcast(ep->qp, &ep->mc_dest[0].mgid,
-				 be16toh(ep->mc_dest[0].av.dlid));
+				 ep->mc_dest[0].av.dlid);
 		ibv_destroy_ah(ep->mc_dest[0].ah);
 		ep->mc_dest[0].ah = NULL;
 	}