[ofa-general] Re: [RFC][PATCH] last wqe event handler patch

[Shirley Ma]

Roland Dreier <rdreier at cisco.com> wrote on 06/25/2008 03:26:07 PM:

> This is probably a question for Eli or other Mellanox guys: is it
> possible for the driver to see a "last WQE reached" event before all
> CQEs are actually visible with mthca HW -- ie is the scenario below with
> two QPs attached to an SRQ:
>
>     last WQE event for QP A
>     last WQE event for QP B
>     post send to QP that will complete with flush err
>
> then poll CQEs and see the send completion from QP A followed by a
> receive completion for QP B actually possible?

My understand it could happen from the comments under
 static void ipoib_cm_start_rx_drain()
{
        /*
         * QPs on flush list are error state.  This way, a "flush
         * error" WC will be immediately generated for each WR we post.
         */
        p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
        if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
                ipoib_warn(priv, "failed to post drain wr\n");

...
}

Eli, Please clarify here.

Thanks
Shirley
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