[dpdk-stable] patch 'net/mlx5: fix reusing Rx/Tx queues' has been queued to stable release 17.02.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 17.02.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 05/28/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 962782ddfe8ad754fe1537b86df45de9279fc0c2 Mon Sep 17 00:00:00 2001
From: Yongseok Koh <yskoh at mellanox.com>
Date: Tue, 21 Mar 2017 10:50:51 -0700
Subject: [PATCH] net/mlx5: fix reusing Rx/Tx queues

[ upstream commit 69a3d576f0c7f4e5ecf905a04e6e24eff6967fb0 ]

When configuring Rx/Tx queue, if queue already exists, it is reused. But if
the queue size is changed, it must be resized to not access/overwrite
invalid memory.

Fixes: 2e22920b85d9 ("mlx5: support non-scattered Tx and Rx")

Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro at 6wind.com>
---
 drivers/net/mlx5/mlx5_rxq.c | 13 +++++++++++++
 drivers/net/mlx5/mlx5_txq.c | 13 +++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index 28e93d3..118f6d6 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -1247,6 +1247,19 @@ mlx5_rx_queue_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t desc,
 		}
 		(*priv->rxqs)[idx] = NULL;
 		rxq_cleanup(rxq_ctrl);
+		/* Resize if rxq size is changed. */
+		if (rxq_ctrl->rxq.elts_n != log2above(desc)) {
+			rxq_ctrl = rte_realloc(rxq_ctrl,
+					       sizeof(*rxq_ctrl) +
+					       desc * sizeof(struct rte_mbuf *),
+					       RTE_CACHE_LINE_SIZE);
+			if (!rxq_ctrl) {
+				ERROR("%p: unable to reallocate queue index %u",
+					(void *)dev, idx);
+				priv_unlock(priv);
+				return -ENOMEM;
+			}
+		}
 	} else {
 		rxq_ctrl = rte_calloc_socket("RXQ", 1, sizeof(*rxq_ctrl) +
 					     desc * sizeof(struct rte_mbuf *),
diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c
index 949035b..c9b2ae4 100644
--- a/drivers/net/mlx5/mlx5_txq.c
+++ b/drivers/net/mlx5/mlx5_txq.c
@@ -496,6 +496,19 @@ mlx5_tx_queue_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t desc,
 		}
 		(*priv->txqs)[idx] = NULL;
 		txq_cleanup(txq_ctrl);
+		/* Resize if txq size is changed. */
+		if (txq_ctrl->txq.elts_n != log2above(desc)) {
+			txq_ctrl = rte_realloc(txq_ctrl,
+					       sizeof(*txq_ctrl) +
+					       desc * sizeof(struct rte_mbuf *),
+					       RTE_CACHE_LINE_SIZE);
+			if (!txq_ctrl) {
+				ERROR("%p: unable to reallocate queue index %u",
+					(void *)dev, idx);
+				priv_unlock(priv);
+				return -ENOMEM;
+			}
+		}
 	} else {
 		txq_ctrl =
 			rte_calloc_socket("TXQ", 1,
-- 
1.9.0