Re: [PATCH net 0/2] gre: merged GRE-over-FOU/GUE packets are dropped (bug report, possible fix)

Hello:

This series was applied to netdev/net.git (main)
by Jakub Kicinski [off-list ref]:

On Sun, 11 Oct 2026 01:41:26 +0000 you wrote:

I hit this by accident while working on something else: bulk TCP through
GRE-over-FOU tunnels between some EC2 VMs crawled at about one segment per
round trip, and turning GRO off on the receiving NIC made it go away. I'm
not a kernel networking person, so I went to debug it with an LLM coding
agent, and it found what's below.

Please consider this series a bug report at best. Feel free to ignore it,
or to fix it some other way if this isn't the right fix; I may well have
this wrong. Empirically, though, patch 1 fixes the packet loss we were
seeing, both on our VMs and in the reproducer in patch 2.

[...]

Here is the summary with links:
  - [net,1/2] gre: keep the UDP tunnel GSO type when completing GRO
    https://git.kernel.org/netdev/net/c/718f364a20ec
  - [net,2/2] selftests: net: add a test for GRO of GRE over FOU and GUE
    https://git.kernel.org/netdev/net/c/d0eb9632fd98

You are awesome, thank you!
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