From: Christoph Lameter cl@gentwo.de
stable inclusion from stable-5.10.71 commit 62ba3c50104b405b522bf539eebf70cf0dce8fcd bugzilla: 182981 https://gitee.com/openeuler/kernel/issues/I4I3KD
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 2cc74e1ee31d00393b6698ec80b322fd26523da4 ]
ROCE uses IGMP for Multicast instead of the native Infiniband system where joins are required in order to post messages on the Multicast group. On Ethernet one can send Multicast messages to arbitrary addresses without the need to subscribe to a group.
So ROCE correctly does not send IGMP joins during rdma_join_multicast().
F.e. in cma_iboe_join_multicast() we see:
if (addr->sa_family == AF_INET) { if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) { ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT; if (!send_only) { err = cma_igmp_send(ndev, &ib.rec.mgid, true); } } } else {
So the IGMP join is suppressed as it is unnecessary.
However no such check is done in destroy_mc(). And therefore leaving a sendonly multicast group will send an IGMP leave.
This means that the following scenario can lead to a multicast receiver unexpectedly being unsubscribed from a MC group:
1. Sender thread does a sendonly join on MC group X. No IGMP join is sent.
2. Receiver thread does a regular join on the same MC Group x. IGMP join is sent and the receiver begins to get messages.
3. Sender thread terminates and destroys MC group X. IGMP leave is sent and the receiver no longer receives data.
This patch adds the same logic for sendonly joins to destroy_mc() that is also used in cma_iboe_join_multicast().
Fixes: ab15c95a17b3 ("IB/core: Support for CMA multicast join flags") Link: https://lore.kernel.org/r/alpine.DEB.2.22.394.2109081340540.668072@gentwo.de Signed-off-by: Christoph Lameter cl@linux.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/infiniband/core/cma.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index a4962b499b61..3029e96161b5 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -1814,6 +1814,8 @@ static void cma_release_port(struct rdma_id_private *id_priv) static void destroy_mc(struct rdma_id_private *id_priv, struct cma_multicast *mc) { + bool send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN); + if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num)) ib_sa_free_multicast(mc->sa_mc);
@@ -1830,7 +1832,10 @@ static void destroy_mc(struct rdma_id_private *id_priv,
cma_set_mgid(id_priv, (struct sockaddr *)&mc->addr, &mgid); - cma_igmp_send(ndev, &mgid, false); + + if (!send_only) + cma_igmp_send(ndev, &mgid, false); + dev_put(ndev); }