On Wed, Jan 5, 2022 at 3:58 PM Flavio Leitner <[email protected]> wrote:
>
> It seems Linux native tunnel configuration changed to enable
> checksum by default and that causes the check-system-tso unit
> test below to fail:
> 10: datapath - ping over vxlan tunnel FAILED (system-traffic.at:248)
>
> That happens because userspace TSO doesn't support encapsulation
> as mentioned in the current documentation. In this specific case,
> udp_extract_tnl_md() checks if the checksum is correct, but since
> TSO is enabled, the outer UDP header contains only the pseudo
> checksum and not the full packet checksum.
>
> Although the packet is marked correctly with UDP csum offload flag
> and the code could use that to verify the pseudo csum, more work
> is needed to properly translate the offloading flags from the outer
> headers to the inner headers. For example, if the payload is a
> TCP packet, most probably the flag DP_PACKET_OL_TX_UDP_CKSUM doesn't
> make sense after decapsulating that.
>
> This patch skips the tunnel tests when the userspace TSO is enabled.
> Fixes: 29bb3093eb8b ("userspace: Enable TSO support for non-DPDK.")
> Signed-off-by: Flavio Leitner <[email protected]>
Reviewed-by: David Marchand <[email protected]>
--
David Marchand
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