[dpdk-stable] patch 'net/ena: fix cleanup of the Tx bufs' has been queued to LTS release 16.11.3

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to LTS release 16.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 07/19/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 577a2e5599698a9d63721b5eacfbd73b83618155 Mon Sep 17 00:00:00 2001
From: Michal Krawczyk <mk at semihalf.com>
Date: Tue, 4 Jul 2017 15:51:52 +0200
Subject: [PATCH] net/ena: fix cleanup of the Tx bufs

[ upstream commit 207a514ce516f8ab3c1ad2b0f930f045b90b773c ]

After cleanup of the mbuf on Tx path, queue was still pointing to this
mbuf and upon cleanup of the Tx buffers, it was being freed second time.

Moreover, to make sure that upon interrupt all mbufs will be freed,
whole ring is being cleaned up instead of part of it - originally only
range between head and tail was being cleaned up.

Fixes: 1173fca25af9 ("ena: add polling-mode driver")

Signed-off-by: Michal Krawczyk <mk at semihalf.com>
---
 drivers/net/ena/ena_ethdev.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 1fc3654..6efe0c3 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -677,11 +677,10 @@ static void ena_rx_queue_release_bufs(struct ena_ring *ring)
 
 static void ena_tx_queue_release_bufs(struct ena_ring *ring)
 {
-	unsigned int ring_mask = ring->ring_size - 1;
+	unsigned int i;
 
-	while (ring->next_to_clean != ring->next_to_use) {
-		struct ena_tx_buffer *tx_buf =
-			&ring->tx_buffer_info[ring->next_to_clean & ring_mask];
+	for (i = 0; i < ring->ring_size; ++i) {
+		struct ena_tx_buffer *tx_buf = &ring->tx_buffer_info[i];
 
 		if (tx_buf->mbuf)
 			rte_pktmbuf_free(tx_buf->mbuf);
@@ -1683,6 +1682,7 @@ static uint16_t eth_ena_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 		/* Free whole mbuf chain  */
 		mbuf = tx_info->mbuf;
 		rte_pktmbuf_free(mbuf);
+		tx_info->mbuf = NULL;
 
 		/* Put back descriptor to the ring for reuse */
 		tx_ring->empty_tx_reqs[next_to_clean & ring_mask] = req_id;
-- 
2.7.4