iw_cxgb4: add queue drain functions
Add completion objects, named sq_drained and rq_drained, to the c4iw_qp
struct. The queue-specific completion object is signaled when the last
CQE is drained from the CQ for that queue.
Add c4iw_drain_sq() to block until qp->rq_drained is completed.
Add c4iw_drain_rq() to block until qp->sq_drained is completed.
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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