[openib-general] [PATCH] ib_cm: randomize starting local comm IDs

[Sean Hefty]

Michael S. Tsirkin wrote:
> so I am wandering why is it not sufficient to wait for
> the window of time as described above to expire?
> Is something broken in CM that this patch is papering over?

Yes.  There are a couple of issues.  The CM doesn't time when a REQ was 
received, and the local comm ID's need rework.  This is a fix that should avoid 
the issues most of the time.

There's also an issue that a user can allocate a QP that's likely to be in time 
wait.

- Sean