-----Original Message-----
From: Dror Goldenberg [mailto:[EMAIL PROTECTED]
Sent: Sunday, September 26, 2004 8:17 PM
To: Sean Hefty; Fab Tillier
Cc: [EMAIL PROTECTED]
Subject: RE: [openib-general] ib_mad shutdown WC status code ?
> -----Original Message-----
> From: Sean Hefty [mailto:[EMAIL PROTECTED]]
> Sent: Friday, September 24, 2004 6:41 PM> I think that flushed makes sense. With queuing in the access
> layer, we should be able to stop and restart the QP in most
> error cases without affecting the user. If the link goes
> down, flushing the requests seems reasonable. What other
> cases would cause the MAD layer to shut down?
>If link goes down, UD QP will go on "sending" the packets as
if link was up all the time. You wouldn't get flushed WQEs in this
case for a UD QP. Receive queue is unaffected by the link
going down.
In general, for UD QPs, you'll get flushed WQEs when the QP
moves to the error state and that seldom happens. The exact
scenarios for this to happen (hopefully I don't miss anything):
- s/g element points at a wrong address/protection error
- HCA can't fetch a WQE (e.g. bus error)
- manually move the QP to the error state (modify QP)-Dror
> - Sean
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