Re: [REGRESSION][BISECTED] r8169: TX stall with checksum offload on VLAN frames with inline tag (REORDER_HDR off) since 1517d1996b52

Hi Thorsten,

On Tue, 6 Oct 2026 at 15:10, Thorsten Leemhuis
[off-list ref] wrote:

Not my area of expertise, so take the following carefully, as it might
send you in the wrong direction:

There is another issue known for 447cbe95ebb9:
Commit 447cbe95ebb9 causes IOMMU DMA faults on macvlan/vlan with bnxt_en
https://lore.kernel.org/all/20261004122616.56714cbd@nargothrond/ (local)

A fix for it is under review:
bnxt_en: fix DMA mapping length for padded small packets
https://lore.kernel.org/all/20261006042153.199444-1-edumazet@kernel.org/ (local)

Is that maybe related?

I hesitate to tell it's completely unrelated, as I don't fully
understand what breaks in our case, however, I'm quite sure that the
fix under review won't help in case of this regression, as it's a
breakage in a completely different ethernet driver from a different
vendor - bnxt_en doesn't play any role on the affected systems from my
report. But _maybe_ there will be some clues what should be fixed in
r8169 in the discussion for the other regression.

Thanks,
Jan