Hi, I have seen the following problem with ipoib: 1. An application registers to a multicast group as a full member. As a result all the groups are listed in dev->mclist. 2. The infiniband link falls momentarily, opensm restarted etc. 3. All multicast memberships are flushed. 4. The net device will not join again until at a later time something will cause ipoib_set_mcast_list() to be called.
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