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Based on the existing skb drop reason, updating the rstreason map can
help us finish the rstreason job in this function.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Link: https://lore.kernel.org/r/20240510122502.27850-3-kerneljasonxing@gmail.com

Signed-off-by: Jakub Kicinski <kuba@kernel.org>