From: Jonathan McDowell noodles@earth.li
[ Upstream commit 99cab7107d914a71c57f5a4e6d34292425fbbb61 ]
The qca8k only supports a switch-wide MTU setting, and the code to take the max of all ports was only looking at the port currently being set. Fix to examine all ports.
Reported-by: DENG Qingfang dqfext@gmail.com Fixes: f58d2598cf70 ("net: dsa: qca8k: implement the port MTU callbacks") Signed-off-by: Jonathan McDowell noodles@earth.li Reviewed-by: Andrew Lunn andrew@lunn.ch Link: https://lore.kernel.org/r/20201030183315.GA6736@earth.li Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/dsa/qca8k.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/dsa/qca8k.c +++ b/drivers/net/dsa/qca8k.c @@ -1219,8 +1219,8 @@ qca8k_port_change_mtu(struct dsa_switch priv->port_mtu[port] = new_mtu;
for (i = 0; i < QCA8K_NUM_PORTS; i++) - if (priv->port_mtu[port] > mtu) - mtu = priv->port_mtu[port]; + if (priv->port_mtu[i] > mtu) + mtu = priv->port_mtu[i];
/* Include L2 header / FCS length */ qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, mtu + ETH_HLEN + ETH_FCS_LEN);