On Wed, Mar 25, 2026 at 10:43 PM Qingfang Deng [off-list ref] wrote:

Hi all,

In some cases (such as BIG TCP) a GRO skb length can overflow a u16,
then what should I do with the u16 length field here?

I think you can either add a check in pppoe_gro_complete() to ensure
the aggregated size does not exceed U16_MAX, avoiding BIG TCP
behavior; Or, set phdr->length to 0 and rely on skb->len to determine
the actual length, as done in BIG TCP itself.