bpf: tcp: Put some tcp cong functions in allowlist for bpf-tcp-cc
This patch puts some tcp cong helper functions, tcp_slow_start() and tcp_cong_avoid_ai(), into the allowlist for the bpf-tcp-cc program. A few tcp cc implementation functions are also put into the allowlist. A potential use case is the bpf-tcp-cc implementation may only want to override a subset of a tcp_congestion_ops. For others, the bpf-tcp-cc can directly call the kernel counter parts instead of re-implementing (or copy-and-pasting) them to the bpf program. They will only be available to the bpf-tcp-cc typed program. The allowlist functions are not bounded to a fixed ABI contract. When any of them has changed, the bpf-tcp-cc program has to be changed like any in-tree/out-of-tree kernel tcp-cc implementations do also. Signed-off-by:Martin KaFai Lau <kafai@fb.com> Signed-off-by:
Alexei Starovoitov <ast@kernel.org> Acked-by:
Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210325015201.1546345-1-kafai@fb.com
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