Messages in this thread | | | Subject | Re: [PATCH] IBcore/CM: Issue DREQ when receiving REQ/REP for stale QP | From | Doug Ledford <> | Date | Wed, 14 Dec 2016 12:55:41 -0500 |
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On 10/28/2016 7:14 AM, Hans Westgaard Ry wrote: > from "InfiBand Architecture Specifications Volume 1": > > A QP is said to have a stale connection when only one side has > connection information. A stale connection may result if the remote CM > had dropped the connection and sent a DREQ but the DREQ was never > received by the local CM. Alternatively the remote CM may have lost > all record of past connections because its node crashed and rebooted, > while the local CM did not become aware of the remote node's reboot > and therefore did not clean up stale connections. > > and: > > A local CM may receive a REQ/REP for a stale connection. It shall > abort the connection issuing REJ to the REQ/REP. It shall then issue > DREQ with "DREQ:remote QPN” set to the remote QPN from the REQ/REP. > > This patch solves a problem with reuse of QPN. Current codebase, that > is IPoIB, relies on a REAP-mechanism to do cleanup of the structures > in CM. A problem with this is the timeconstants governing this > mechanism; they are up to 768 seconds and the interface may look > inresponsive in that period. Issuing a DREQ (and receiving a DREP) > does the necessary cleanup and the interface comes up. > > Signed-off-by: Hans Westgaard Ry <hans.westgaard.ry@oracle.com> > Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Thanks, applied.
-- Doug Ledford <dledford@redhat.com> GPG Key ID: 0E572FDD
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