If the MAD layer did provide queuing to prevent overflow for the requested (not allocated) depth, then the CQ resize is unnecessary. I would expect that whatever code manages the QP/CQ should provide queuing so that MAD agents don't all have to implement queueing with respect to one another.
Resizing the CQ is an optimization only. If the resize fails, the MAD layer will simply restrict the number of outstanding sends/receives. The MAD layer will queue sends, but not receives.
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