From: Antoine Tenart <antoine.tenart@free-electrons.com>
Date: Tue, 28 Nov 2017 14:19:51 +0100
Subject: net: mvpp2: check ethtool sets the Tx ring size is to a valid min
 value
Patch-mainline: v4.15-rc2
Git-commit: 76e583c5f50ef539caea6935d37af3595034befb
References: bsc#1098633

This patch fixes the Tx ring size checks when using ethtool, by adding
an extra check in the PPv2 check_ringparam_valid helper. The Tx ring
size cannot be set to a value smaller than the minimum number of
descriptors needed for TSO.

Fixes: 1d17db08c056 ("net: mvpp2: limit TSO segments and use stop/wake thresholds")
Suggested-by: Yan Markman <ymarkman@marvell.com>
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/marvell/mvpp2.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -6842,6 +6842,12 @@ static int mvpp2_check_ringparam_valid(s
 	else if (!IS_ALIGNED(ring->tx_pending, 32))
 		new_tx_pending = ALIGN(ring->tx_pending, 32);
 
+	/* The Tx ring size cannot be smaller than the minimum number of
+	 * descriptors needed for TSO.
+	 */
+	if (new_tx_pending < MVPP2_MAX_SKB_DESCS)
+		new_tx_pending = ALIGN(MVPP2_MAX_SKB_DESCS, 32);
+
 	if (ring->rx_pending != new_rx_pending) {
 		netdev_info(dev, "illegal Rx ring size value %d, round to %d\n",
 			    ring->rx_pending, new_rx_pending);