[openib-general] [RFC] [PATCH] ib_cm: send DREP in response to unmatched DREQ

[Sean Hefty]

Sean Hefty wrote:
> Currently a DREP is only sent in response to a DREQ if a connection
> has been found matching the DREQ, and it is in the proper state.  Once
> a DREP is sent, the local connection moves into timewait.  Duplicate
> DREQs received while in this state result in re-sending the DREP.
> 
> However, it's likely that the local connection will enter and exit
> timewait before the remote side times out a lost DREP and resends a DREQ.
> There are a couple possible solutions to this.  One is to increase how
> long a connection remains in timewait, by multiplying its wait time by
> max_cm_retries.  This can greatly increase the timewait state before a QP
> can be re-used when CM messages are not lost.
> 
> An alternative is to send a DREP in response to a DREQ, even if a local
> connection is not found, which is what this patch does.

If there are no objections, I will commit this patch to svn, and submit for 
inclusion upstream.

- Sean