commit e2c3c3fefa26287dcce1e70634792cff47d775ff Author: Michael J. Ruhl 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 Signed-off-by: Michael J. Ruhl Signed-off-by: Doug Ledford diff --git a/ibacm/prov/acmp/src/acmp.c b/ibacm/prov/acmp/src/acmp.c index aa784166..78d9a295 100644 --- a/ibacm/prov/acmp/src/acmp.c +++ b/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; }