Offering: HULK
hulk inclusion
category: feature
bugzilla: N/A

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In order to process TCP packet with BPF/XDP, it's necessary to
synchronize seq and ack between kernel network stack and bpf prog.
This patch introduces a sample helper to do the sync.

Note that, it's only used for samples, retransmission and congestion
control are not supported.
Signed-off-by: NHe Fengqing <hefengqing@huawei.com>
Signed-off-by: NXu Kuohai <xukuohai@huawei.com>
Signed-off-by: NYang Jihong <yangjihong@huawei.com>