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tcp: Add new args for cong_control in tcp_congestion_ops

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This patch adds two new arguments for cong_control of struct
tcp_congestion_ops:
 - ack
 - flag
These two arguments are inherited from the caller tcp_cong_control in
tcp_intput.c. One use case of them is to update cwnd and pacing rate
inside cong_control based on the info they provide. For example, the
flag can be used to decide if it is the right time to raise or reduce a
sender's cwnd.

Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Miao Xu <miaxu@meta.com>
Link: https://lore.kernel.org/r/20240502042318.801932-2-miaxu@meta.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Miao Xu 2024-05-01 21:23:16 -07:00 committed by Martin KaFai Lau
parent f8c423d1ca
commit 57bfc7605c
5 changed files with 8 additions and 7 deletions
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2
include/net/tcp.h
View File

@ -1172,7 +1172,7 @@ struct tcp_congestion_ops {
/* call when packets are delivered to update cwnd and pacing rate,
* after all the ca_state processing. (optional)
*/
void (*cong_control)(struct sock *sk, const struct rate_sample *rs);
void (*cong_control)(struct sock *sk, u32 ack, int flag, const struct rate_sample *rs);
/* new value of cwnd after loss (required) */

3
net/ipv4/bpf_tcp_ca.c
View File

@ -307,7 +307,8 @@ static u32 bpf_tcp_ca_min_tso_segs(struct sock *sk)
return 0;
}
static void bpf_tcp_ca_cong_control(struct sock *sk, const struct rate_sample *rs)
static void bpf_tcp_ca_cong_control(struct sock *sk, u32 ack, int flag,
const struct rate_sample *rs)
{
}

2
net/ipv4/tcp_bbr.c
View File

@ -1024,7 +1024,7 @@ static void bbr_update_model(struct sock *sk, const struct rate_sample *rs)
bbr_update_gains(sk);
}
__bpf_kfunc static void bbr_main(struct sock *sk, const struct rate_sample *rs)
__bpf_kfunc static void bbr_main(struct sock *sk, u32 ack, int flag, const struct rate_sample *rs)
{
struct bbr *bbr = inet_csk_ca(sk);
u32 bw;

2
net/ipv4/tcp_input.c
View File

@ -3541,7 +3541,7 @@ static void tcp_cong_control(struct sock *sk, u32 ack, u32 acked_sacked,
const struct inet_connection_sock *icsk = inet_csk(sk);
if (icsk->icsk_ca_ops->cong_control) {
icsk->icsk_ca_ops->cong_control(sk, rs);
icsk->icsk_ca_ops->cong_control(sk, ack, flag, rs);
return;
}

6
tools/testing/selftests/bpf/progs/tcp_ca_kfunc.c
View File

@ -5,7 +5,7 @@
#include <bpf/bpf_tracing.h>
extern void bbr_init(struct sock *sk) __ksym;
extern void bbr_main(struct sock *sk, const struct rate_sample *rs) __ksym;
extern void bbr_main(struct sock *sk, u32 ack, int flag, const struct rate_sample *rs) __ksym;
extern u32 bbr_sndbuf_expand(struct sock *sk) __ksym;
extern u32 bbr_undo_cwnd(struct sock *sk) __ksym;
extern void bbr_cwnd_event(struct sock *sk, enum tcp_ca_event event) __ksym;
@ -42,9 +42,9 @@ void BPF_PROG(in_ack_event, struct sock *sk, u32 flags)
}
SEC("struct_ops/cong_control")
void BPF_PROG(cong_control, struct sock *sk, const struct rate_sample *rs)
void BPF_PROG(cong_control, struct sock *sk, u32 ack, int flag, const struct rate_sample *rs)
{
bbr_main(sk, rs);
bbr_main(sk, ack, flag, rs);
}
SEC("struct_ops/cong_avoid")