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https://bugs.launchpad.net/bugs/1824367
Title:
mlx5 : not able to set a high MTU on the representor port for a VF
Status in linux package in Ubuntu:
Incomplete
Bug description:
Hi,
Using Ubuntu 18.04, kernel 4.15.0-47, with a Mellanox MCX556M-ECAT-S25
[1].
With the distro driver, it's impossible to increase the MTU of a
representor port :
$ sudo ip li set enp50s0f0_0 mtu 1501
RTNETLINK answers: Invalid argument
Whereas with the OFED driver [2], I can set it up to 9978 :
$ sudo ip li set mtu 9978 enp50s0f0_0
$
This is blocking to use OVS offloading with jumbo frames. Could we
please get the feature in the distro driver ?
Thanks !
Steps to create the representor :
echo 1 | sudo tee /sys/class/net/enp50s0f0/device/sriov_numvfs
echo 0000:32:00.3 | sudo tee /sys/bus/pci/drivers/mlx5_core/unbind
sudo devlink dev eswitch set pci/0000:32:00.0 mode switchdev
echo 0000:32:00.2 | sudo tee /sys/bus/pci/drivers/mlx5_core/bind
[1] http://www.mellanox.com/related-docs/prod_adapter_cards
/PB_ConnectX-5_VPI_Card_SocketDirect.pdf
[2]
http://www.mellanox.com/page/mlnx_ofed_eula?mtag=linux_sw_drivers&mrequest=downloads&mtype=ofed&mver=MLNX_OFED-4.5-1.0.1.0&mname=MLNX_OFED_LINUX-4.5-1.0.1.0-ubuntu18.04-x86_64.tgz
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