> mmm, why is that common? typically there's a higher layer to which the
 > IB ULP advertises some sort of maximal number of credits (e.g in the
 > SCSI case, iser and srp specify the maximal number of commands in the
 > scsi host template) or the ULP informs a higher layer that no more
 > sends can be done (e.g IPoIB calling netif_stop_queue once it sense
 > that the QP filled, etc).

bugs in the ULP.  And it seems to be a common kind of bug.

In other words this check catches common bugs and makes them a gazillion
times easier to find and fix.  So unless the performance impact is
extreme, I'm inclined to leave it.

 - R.
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