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bpf: Add BPF_FUNC_tcp_send_ack helper
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Add a helper to send out a tcp-ack.  It will be used in the later
bpf_dctcp implementation that requires to send out an ack
when the CE state changed.

Signed-off-by: Martin KaFai Lau <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
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iamkafai authored and Alexei Starovoitov committed Jan 9, 2020
1 parent 0baf26b commit 206057f
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Showing 2 changed files with 33 additions and 2 deletions.
11 changes: 10 additions & 1 deletion include/uapi/linux/bpf.h
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24 changes: 23 additions & 1 deletion net/ipv4/bpf_tcp_ca.c
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