[PATCH] net/mana: use the correct WQE count for ringing RQ doorbell

[longli@linuxonhyperv.com]

From: Long Li <longli@microsoft.com>

The hardware specification specifies that WQE_COUNT should set to 0 for
the Receive Queue. Although currently the hardware doesn't enforce the
check, in the future releases it may check on this value.
---
 drivers/net/mana/mana.h |  2 +-
 drivers/net/mana/rx.c   | 11 +++++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mana/mana.h b/drivers/net/mana/mana.h
index dfeda531eb..5801491d75 100644
--- a/drivers/net/mana/mana.h
+++ b/drivers/net/mana/mana.h
@@ -457,7 +457,7 @@ extern int mana_logtype_init;
 
 int mana_ring_doorbell(void *db_page, enum gdma_queue_types queue_type,
 		       uint32_t queue_id, uint32_t tail, uint8_t arm);
-int mana_rq_ring_doorbell(struct mana_rxq *rxq, uint8_t arm);
+int mana_rq_ring_doorbell(struct mana_rxq *rxq);
 
 int gdma_post_work_request(struct mana_gdma_queue *queue,
 			   struct gdma_work_request *work_req,
diff --git a/drivers/net/mana/rx.c b/drivers/net/mana/rx.c
index b840e402f9..4b8aca49ef 100644
--- a/drivers/net/mana/rx.c
+++ b/drivers/net/mana/rx.c
@@ -22,7 +22,7 @@ static uint8_t mana_rss_hash_key_default[TOEPLITZ_HASH_KEY_SIZE_IN_BYTES] = {
 };
 
 int
-mana_rq_ring_doorbell(struct mana_rxq *rxq, uint8_t arm)
+mana_rq_ring_doorbell(struct mana_rxq *rxq)
 {
 	struct mana_priv *priv = rxq->priv;
 	int ret;
@@ -36,10 +36,13 @@ mana_rq_ring_doorbell(struct mana_rxq *rxq, uint8_t arm)
 		db_page = process_priv->db_page;
 	}
 
+	/* Hardware Spec specifies that software client should set 0 for
+	 * wqe_cnt for Receive Queues.
+	 */
 	ret = mana_ring_doorbell(db_page, GDMA_QUEUE_RECEIVE,
 			 rxq->gdma_rq.id,
 			 rxq->gdma_rq.head * GDMA_WQE_ALIGNMENT_UNIT_SIZE,
-			 arm);
+			 0);
 
 	if (ret)
 		DP_LOG(ERR, "failed to ring RX doorbell ret %d", ret);
@@ -120,7 +123,7 @@ mana_alloc_and_post_rx_wqes(struct mana_rxq *rxq)
 		}
 	}
 
-	mana_rq_ring_doorbell(rxq, rxq->num_desc);
+	mana_rq_ring_doorbell(rxq);
 
 	return ret;
 }
@@ -532,7 +535,7 @@ mana_rx_burst(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n)
 	}
 
 	if (wqe_posted)
-		mana_rq_ring_doorbell(rxq, wqe_posted);
+		mana_rq_ring_doorbell(rxq);
 
 	return pkt_received;
 }
-- 
2.34.1