[ofa-general] Re: [ewg] Re: OFED 1.2 beta blocking bugs
Sean Hefty
mshefty at ichips.intel.com
Thu Mar 8 11:13:49 PST 2007
>From a quick look at the code, it does look like there are some races
> in ipoib_multicast.c. The place where a QP is actually attached to a
> group is essentially (trimming debug prints):
>
> if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
> return 0;
>
> ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
> &mcast->mcmember.mgid);
>
> and the place where a QP is detached is:
>
> if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
> ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
> &mcast->mcmember.mgid);
Going back to 2.6.20 (pre-multicast changes), this area of the code looks like
it has the same race. Was IPoIB HA testing done on 2.6.20 or earlier versions
of the code, and if so, were any issues found? (I'm not sure we've found all of
the problems yet.)
- Sean
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