diff options
| author | Yixin Shen <bobankhshen@gmail.com> | 2023-03-29 10:35:58 +0300 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2023-03-29 23:10:56 +0300 |
| commit | 4239561b69feb94e52e43d93685cc46fb9dbcae5 (patch) | |
| tree | e16331d33a1dab203c847b830d862e3a3a09a559 | |
| parent | 562dc56a88983421a6c5a46e0feb891873d118a1 (diff) | |
| download | linux-4239561b69feb94e52e43d93685cc46fb9dbcae5.tar.xz | |
selftests/bpf: test a BPF CC writing app_limited
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>
| -rw-r--r-- | tools/testing/selftests/bpf/progs/tcp_ca_write_sk_pacing.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/tools/testing/selftests/bpf/progs/tcp_ca_write_sk_pacing.c b/tools/testing/selftests/bpf/progs/tcp_ca_write_sk_pacing.c index 43447704cf0e..0724a79cec78 100644 --- a/tools/testing/selftests/bpf/progs/tcp_ca_write_sk_pacing.c +++ b/tools/testing/selftests/bpf/progs/tcp_ca_write_sk_pacing.c @@ -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") |