Re: [PATCH v2 net] veth: ensure skb entering GRO are not cloned.

Hello:

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

On Wed, 22 Dec 2021 19:39:52 +0100 you wrote:

After commit d3256efd8e8b ("veth: allow enabling NAPI even without XDP"),
if GRO is enabled on a veth device and TSO is disabled on the peer
device, TCP skbs will go through the NAPI callback. If there is no XDP
program attached, the veth code does not perform any share check, and
shared/cloned skbs could enter the GRO engine.

Ignat reported a BUG triggered later-on due to the above condition:

[...]

Here is the summary with links:
  - [v2,net] veth: ensure skb entering GRO are not cloned.
    https://git.kernel.org/netdev/net/c/9695b7de5b47

You are awesome, thank you!
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