2 Replies Latest reply on Dec 21, 2016 10:46 AM by ophirmaor

    mlx4 driver stripping inner vlan from double-tagged frame

    jonohart

      Hi,

       

      I'm trying to send a frame that has two VLAN tags (two 0x8100 tags) out of a Mellanox ConnectX-3 40G NIC.

       

      When tx-vlan-offload is turned on (which it is by default), I see the inner VLAN tag is missing when I sniff the frame on the wire, despite being present when the frame is sent out to the interface (as seen in tcpdump).

       

      When I turn tx-vlan-offload off, then both VLAN tags are present on the wire as expected.

       

      I'm using version 3.1-1.0.4 of the mlx4 driver.

       

      Does anyone know why this is happening? Is it a bug in the driver? Is it a known issue?

       

      Thanks!