On 9/4/25 5:56 PM, Alexei Starovoitov wrote:
On Thu, Sep 4, 2025 at 5:11 AM Paul Chaignon <paul.chaignon@xxxxxxxxx> wrote:
This patch adds support for crafting non-linear skbs in BPF test runs
for tc programs, via a new flag BPF_F_TEST_SKB_NON_LINEAR. When this
flag is set, only the L2 header is pulled in the linear area.
...
+ /* eth_type_trans expects the Ethernet header in the linear area. */
+ __pskb_pull_tail(skb, ETH_HLEN);
Looks useful, but only L2 ? Is it realistic ?
I don't recall any driver that would do L2 only.
Is L2 only enough to cover all corner cases in your progs ?
Should the linear size be a configurable parameter for prog_run() ?
Yeah perhaps we could make this configurable. The ETH_HLEN is a common case
we've seen and also what virtual drivers pull in at min, but with NICs doing
header/data split its probably better to let the user define this as part
of the testing. Then we're more flexible.
Cheers,
Daniel
