On 5/16/25 1:38 AM, Ronak Doshi wrote:

On Thu, May 15, 2025 at 2:25 PM Jakub Kicinski [off-list ref] wrote:

quoted

Not sure if the stack itself cares, but drivers look at those
fields for TSO. I see a call to skb_inner_transport_offset()
in vmxnet3_parse_hdr(). One thing to try would be to configure
the machine for forwarding so that the packet comes via LRO
and leaves via TSO.

I see. Yes, drivers do check for it. Sure, let me update the patch to not set
encapsulation.

AFAICS, not setting skb->encapsulation, but still building a GSO packet
would still break the s/w segmentation in the scenario described by my
previous email.

/P