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BPF_F_RECOMPUTE_CSUM doesn't update the actual L3 and L4 checksums in the packet, but simply updates skb->csum (according to skb->ip_summed). This patch clarifies that to avoid confusions. Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com> Link: https://lore.kernel.org/r/ff6895d42936f03dbb82334d8bcfd50e00c79086.1744102490.git.paul.chaignon@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>