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[ Upstream commitb848521701] iavf sets LIBIE_MAX_MTU as netdev->max_mtu, ignoring vf_res->max_mtu from PF [1]. This allows setting an MTU beyond the actual hardware limit, causing TX queue timeouts [2]. Set correct netdev->max_mtu using vf_res->max_mtu from the PF. Note that currently PF drivers such as ice/i40e set the frame size in vf_res->max_mtu, not MTU. Convert vf_res->max_mtu to MTU before setting netdev->max_mtu. [1] # ip -j -d link show $DEV | jq '.[0].max_mtu' 16356 [2] iavf 0000:00:05.0 enp0s5: NETDEV WATCHDOG: CPU: 1: transmit queue 0 timed out 5692 ms iavf 0000:00:05.0 enp0s5: NIC Link is Up Speed is 10 Gbps Full Duplex iavf 0000:00:05.0 enp0s5: NETDEV WATCHDOG: CPU: 6: transmit queue 3 timed out 5312 ms iavf 0000:00:05.0 enp0s5: NIC Link is Up Speed is 10 Gbps Full Duplex ... Fixes:5fa4caff59("iavf: switch to Page Pool") Signed-off-by: Kohei Enju <kohei@enjuk.jp> Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com> Reviewed-by: Simon Horman <horms@kernel.org> Tested-by: Rafal Romanowski <rafal.romanowski@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>