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tcp: add earliest departure time to SCM_TIMESTAMPING_OPT_STATS

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This change adds TCP_NLA_EDT to SCM_TIMESTAMPING_OPT_STATS that reports
the earliest departure time(EDT) of the timestamped skb. By tracking EDT
values of the skb from different timestamps, we can observe when and how
much the value changed. This allows to measure the precise delay
injected on the sender host e.g. by a bpf-base throttler.

Signed-off-by: Yousuk Seung <ysseung@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yousuk Seung 2020-07-30 15:44:40 -07:00 committed by David S. Miller
parent c6886957d2
commit 48040793fa
4 changed files with 9 additions and 3 deletions
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3
include/linux/tcp.h
View File

@ -484,7 +484,8 @@ static inline void tcp_saved_syn_free(struct tcp_sock *tp)
tp->saved_syn = NULL;
}
struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk);
struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk,
const struct sk_buff *orig_skb);
static inline u16 tcp_mss_clamp(const struct tcp_sock *tp, u16 mss)
{

1
include/uapi/linux/tcp.h
View File

@ -313,6 +313,7 @@ enum {
TCP_NLA_SRTT, /* smoothed RTT in usecs */
TCP_NLA_TIMEOUT_REHASH, /* Timeout-triggered rehash attempts */
TCP_NLA_BYTES_NOTSENT, /* Bytes in write queue not yet sent */
TCP_NLA_EDT, /* Earliest departure time (CLOCK_MONOTONIC) */
};
/* for TCP_MD5SIG socket option */

2
net/core/skbuff.c
View File

@ -4692,7 +4692,7 @@ void __skb_tstamp_tx(struct sk_buff *orig_skb,
if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_STATS) &&
sk->sk_protocol == IPPROTO_TCP &&
sk->sk_type == SOCK_STREAM) {
skb = tcp_get_timestamping_opt_stats(sk);
skb = tcp_get_timestamping_opt_stats(sk, orig_skb);
opt_stats = true;
} else
#endif

6
net/ipv4/tcp.c
View File

@ -3501,10 +3501,12 @@ static size_t tcp_opt_stats_get_size(void)
nla_total_size(sizeof(u32)) + /* TCP_NLA_SRTT */
nla_total_size(sizeof(u16)) + /* TCP_NLA_TIMEOUT_REHASH */
nla_total_size(sizeof(u32)) + /* TCP_NLA_BYTES_NOTSENT */
nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_EDT */
0;
}
struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk)
struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk,
const struct sk_buff *orig_skb)
{
const struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *stats;
@ -3558,6 +3560,8 @@ struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk)
nla_put_u16(stats, TCP_NLA_TIMEOUT_REHASH, tp->timeout_rehash);
nla_put_u32(stats, TCP_NLA_BYTES_NOTSENT,
max_t(int, 0, tp->write_seq - tp->snd_nxt));
nla_put_u64_64bit(stats, TCP_NLA_EDT, orig_skb->skb_mstamp_ns,
TCP_NLA_PAD);
return stats;
}