quoted

polling the completion queue directly does not interfere
with the existing polling logic, hence drop the requirement.

This can be used for polling mode ULPs.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/infiniband/core/cq.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/infiniband/core/cq.c b/drivers/infiniband/core/cq.c
index 21d1a38af489..7f6ae0ecb0c5 100644
--- a/drivers/infiniband/core/cq.c
+++ b/drivers/infiniband/core/cq.c

@@ -64,8 +64,6 @@ static int __ib_process_cq(struct ib_cq *cq, int budget)
  */
 int ib_process_cq_direct(struct ib_cq *cq, int budget)
 {
-	WARN_ON_ONCE(cq->poll_ctx != IB_POLL_DIRECT);
-
 	return __ib_process_cq(cq, budget);
 }
 EXPORT_SYMBOL(ib_process_cq_direct);

Using ib_process_cq_direct() for queues that have another type than
IB_POLL_DIRECT may trigger concurrent CQ processing.

Correct.

Before this patch
the completions from each CQ were processed sequentially. That's a big
change so I think this should be mentioned clearly in the header above
ib_process_cq_direct().

Note that I now see that the cq lock is not sufficient for mutual
exclusion here because we're referencing cq->wc array outside of it.

There are three options I see here:
1. we'll need to allocate a different wc array for polling mode,
perhaps a smaller one?
2. Export __ib_process_cq (in some form) with an option to pass in a wc
array.
3. Simply not support non-selective polling but it seems like a shame...

Any thoughts?