On Thu, 4 Sep 2025 15:19:28 -0700 Amery Hung wrote: > On Thu, Aug 28, 2025 at 6:44 AM Nimrod Oren <noren@xxxxxxxxxx> wrote: > > On 25/08/2025 22:39, Amery Hung wrote: > > > Move skb_frag_t adjustment into bpf_xdp_shrink_data() and extend its > > > functionality to be able to shrink an xdp fragment from both head and > > > tail. In a later patch, bpf_xdp_pull_data() will reuse it to shrink an > > > xdp fragment from head. > > I had assumed that XDP multi-buffer frags must always be the same size, > > except for the last one. If that’s the case, shrinking from the head > > seems to break this rule. > > I am not aware of the assumption in the code. Is this documented somewhere? There's no such rule. Perhaps conflating frags with segments after TSO.
