for now, we need not take care the kabi, and, there
is 4B leaved for us in tcp_skb_cb, use it.
future rebase may make tcp_skb_cb bigger, there is
two method:
1. revert this patch
2. make sk_buff.cb bigger, while, this method may
be not good because the size of sk_buff may
affect the rwin size, which is so important to
tcp
Reviewed-by: kernelxing <kernelxing@tencent.com>
Signed-off-by: MengEn Sun <mengensun@tencent.com>
74068984c6