[PATCH rdma-next 2/3] RDMA/mana_ib: MMQ creation for RC QPs

[Konstantin Taranov <kotaranov@linux.microsoft.com>]

From: Konstantin Taranov <kotaranov@microsoft.com>

Create an MMQ for an RC QP when userspace sets the corresponding
compatibility-mask flag. Register the userspace MMQ buffer and pass the
queue to hardware instead of setting the NO_MMQ creation flag.

Keep the MMQ disabled for applications that do not request it, preserving
the existing behavior. Return the created MMQ ID to userspace in the
extended RC QP response.

Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
---
 drivers/infiniband/hw/mana/qp.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/infiniband/hw/mana/qp.c b/drivers/infiniband/hw/mana/qp.c
index aa5f8c6077bb0..c6821ae5fac1c 100644
--- a/drivers/infiniband/hw/mana/qp.c
+++ b/drivers/infiniband/hw/mana/qp.c
@@ -557,16 +557,22 @@ static int mana_ib_create_rc_qp(struct ib_qp *ibqp, struct ib_pd *ibpd,
 
 	for (i = 0, j = 0; i < MANA_RC_QUEUE_TYPE_MAX; ++i) {
 		if (i == MANA_RC_SEND_QUEUE_MMQ) {
-			qp->rc_qp.queues[i].id = INVALID_QUEUE_ID;
-			qp->rc_qp.queues[i].gdma_region = GDMA_INVALID_DMA_REGION;
+			if (ucmd.comp_mask & MANA_IB_RC_MMQ_CREATE) {
+				flags &= ~MANA_RC_FLAG_NO_MMQ;
+				err = mana_ib_create_queue(mdev, ucmd.mmq_buf, ucmd.mmq_size,
+							   &qp->rc_qp.queues[i]);
+				if (err)
+					goto destroy_queues;
+			} else {
+				qp->rc_qp.queues[i].id = INVALID_QUEUE_ID;
+				qp->rc_qp.queues[i].gdma_region = GDMA_INVALID_DMA_REGION;
+			}
 			continue;
 		}
 		err = mana_ib_create_queue(mdev, ucmd.queue_buf[j], ucmd.queue_size[j],
 					   &qp->rc_qp.queues[i]);
-		if (err) {
-			ibdev_err(&mdev->ib_dev, "Failed to create queue %d, err %d\n", i, err);
+		if (err)
 			goto destroy_queues;
-		}
 		j++;
 	}
 
@@ -580,8 +586,10 @@ static int mana_ib_create_rc_qp(struct ib_qp *ibqp, struct ib_pd *ibpd,
 
 	if (udata) {
 		for (i = 0, j = 0; i < MANA_RC_QUEUE_TYPE_MAX; ++i) {
-			if (i == MANA_RC_SEND_QUEUE_MMQ)
+			if (i == MANA_RC_SEND_QUEUE_MMQ) {
+				resp.mmq_id = qp->rc_qp.queues[i].id;
 				continue;
+			}
 			resp.queue_id[j] = qp->rc_qp.queues[i].id;
 			j++;
 		}
-- 
2.43.0