[PATCH FIX For-3.19 v4 0/7] IB/ipoib: follow fixes for multicast handling

[Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

These patches are to resolve issues created by my previous patch set.
While that set worked fine in my testing, there were problems with
multicast joins after the initial set of joins had completed.  Since my
testing relied upon the normal set of multicast joins that happen
when the interface is first brought up, I missed those problems.

Symptoms vary from failure to send packets due to a failed join, to
loss of connectivity after a subnet manager restart, to failure
to properly release multicast groups on shutdown resulting in hangs
when the mlx4 driver attempts to unload itself via its reboot
notifier handler.

This set of patches has passed a number of tests above and beyond my
original tests.  As suggested by Or Gerlitz I added IPv6 and IPv4
multicast tests.  I also added both subnet manager restarts and
manual shutdown/restart of individual ports at the switch in order to
ensure that the ENETRESET path was properly tested.  I included
testing, then a subnet manager restart, then a quiescent period for
caches to expire, then restarting testing to make sure that arp and
neighbor discovery work after the subnet manager restart.

All in all, I have not been able to trip the multicast joins up any
longer.

Additionally, the original impetus for my first 8 patch set was that
it was simply too easy to break the IPoIB subsystem with this simple
loop:

while true; do
    ifconfig ib0 up
    ifconfig ib0 down
done

Just to be safe, I made sure this problem did not resurface.

Roland, the 3.19-rc code is broken.  We either need to revert my
original patchset, or grab these, but I would not recommend leaving
it as it currently stands.

Doug Ledford (7):
  IB/ipoib: Fix failed multicast joins/sends
  IB/ipoib: Add a helper to restart the multicast task
  IB/ipoib: make delayed tasks not hold up everything
  IB/ipoib: Handle -ENETRESET properly in our callback
  IB/ipoib: don't restart our thread on ENETRESET
  IB/ipoib: remove unneeded locks
  IB/ipoib: fix race between mcast_dev_flush and mcast_join

 drivers/infiniband/ulp/ipoib/ipoib.h           |   1 +
 drivers/infiniband/ulp/ipoib/ipoib_multicast.c | 204 +++++++++++++++----------
 2 files changed, 121 insertions(+), 84 deletions(-)

-- 
2.1.0

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