0012-net-ena-update-completion-queue-after-cleanup.patch

From 28a3fd0a5fd89a61c5992c2acc7626b844f5a60d Mon Sep 17 00:00:00 2001
From: Rafal Kozik <rk@semihalf.com>
Date: Fri, 14 Dec 2018 14:18:44 +0100
Subject: [PATCH 12/27] net/ena: update completion queue after cleanup

[ upstream commit a45462c507e98b49cb5c2302e0be3c72d2e20a1a ]

After Rx or Tx cleanup update completion queue head by calling
ena_com_update_dev_comp_head().

Fixes: 1daff5260ff8 ("net/ena: use unmasked head and tail")
Cc: stable@dpdk.org

Change-Id: I86e07cdaedbeefc581aed75137d06b9259a5190a
Signed-off-by: Rafal Kozik <rk@semihalf.com>
Acked-by: Michal Krawczyk <mk@semihalf.com>
---
 drivers/net/ena/ena_ethdev.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index ee7605a3b6..813e95e95e 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -1922,8 +1922,10 @@ static uint16_t eth_ena_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 
 	desc_in_use = desc_in_use - completed + 1;
 	/* Burst refill to save doorbells, memory barriers, const interval */
-	if (ring_size - desc_in_use > ENA_RING_DESCS_RATIO(ring_size))
+	if (ring_size - desc_in_use > ENA_RING_DESCS_RATIO(ring_size)) {
+		ena_com_update_dev_comp_head(rx_ring->ena_com_io_cq);
 		ena_populate_rx_queue(rx_ring, ring_size - desc_in_use);
+	}
 
 	return recv_idx;
 }
@@ -2173,8 +2175,9 @@ static uint16_t eth_ena_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 
 	if (total_tx_descs > 0) {
 		/* acknowledge completion of sent packets */
-		ena_com_comp_ack(tx_ring->ena_com_io_sq, total_tx_descs);
 		tx_ring->next_to_clean = next_to_clean;
+		ena_com_comp_ack(tx_ring->ena_com_io_sq, total_tx_descs);
+		ena_com_update_dev_comp_head(tx_ring->ena_com_io_cq);
 	}
 
 	return sent_idx;
-- 
2.20.1