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 <ymark...@marvell.com> Signed-off-by: Antoine Tenart <antoine.ten...@free-electrons.com> --- drivers/net/ethernet/marvell/mvpp2.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c index 5be58b04b95e..d83a78be98a2 100644 --- a/drivers/net/ethernet/marvell/mvpp2.c +++ b/drivers/net/ethernet/marvell/mvpp2.c @@ -6842,6 +6842,12 @@ static int mvpp2_check_ringparam_valid(struct net_device *dev, 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); -- 2.14.3