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selftests/bpf: test a BPF CC writing app_limited

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Test whether a TCP CC implemented in BPF is allowed to write
app_limited in struct tcp_sock. This is already allowed for
the built-in TCP CC.

Signed-off-by: Yixin Shen <bobankhshen@gmail.com>
Link: https://lore.kernel.org/r/20230329073558.8136-3-bobankhshen@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Yixin Shen 2023-03-29 07:35:58 +00:00 committed by Martin KaFai Lau
parent 562dc56a88
commit 4239561b69
1 changed files with 12 additions and 1 deletions
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13
tools/testing/selftests/bpf/progs/tcp_ca_write_sk_pacing.c
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@ -16,6 +16,16 @@ static inline struct tcp_sock *tcp_sk(const struct sock *sk)
return (struct tcp_sock *)sk;
}
static inline unsigned int tcp_left_out(const struct tcp_sock *tp)
{
return tp->sacked_out + tp->lost_out;
}
static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp)
{
return tp->packets_out - tcp_left_out(tp) + tp->retrans_out;
}
SEC("struct_ops/write_sk_pacing_init")
void BPF_PROG(write_sk_pacing_init, struct sock *sk)
{
@ -31,11 +41,12 @@ SEC("struct_ops/write_sk_pacing_cong_control")
void BPF_PROG(write_sk_pacing_cong_control, struct sock *sk,
const struct rate_sample *rs)
{
const struct tcp_sock *tp = tcp_sk(sk);
struct tcp_sock *tp = tcp_sk(sk);
unsigned long rate =
((tp->snd_cwnd * tp->mss_cache * USEC_PER_SEC) << 3) /
(tp->srtt_us ?: 1U << 3);
sk->sk_pacing_rate = min(rate, sk->sk_max_pacing_rate);
tp->app_limited = (tp->delivered + tcp_packets_in_flight(tp)) ?: 1;
}
SEC("struct_ops/write_sk_pacing_ssthresh")