Re: [PATCH 3/9] IB: add a helper to safely drain a QP

[Sagi Grimberg]

> After looking at the nes driver, I don't see any common way to support drain w/o some serious driver mods.  Since SRP is the only
> user, perhaps we can ignore iWARP for this function...

But iser/isert essentially does it too (and I think xprtrdma will have
it soon)...

the modify_qp is invoked from rdma_disconnect() and we do post
an 'empty' wr to wait for all the flushes to drain (see
iser_conn_terminate).
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