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tcp: add tcpi_min_rtt and tcpi_notsent_bytes to tcp_info 

tcpi_min_rtt reports the minimal rtt observed by TCP stack for the flow,
in usec unit. Might be ~0U if not yet known.

tcpi_notsent_bytes reports the amount of bytes in the write queue that
were not yet sent.

This is done in a single patch to not add a temporary 32bit padding hole
in tcp_info.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-02-11 22:02:53 -08:00 committed by David S. Miller
parent 4cba259f19
commit cd9b266095
2 changed files with 9 additions and 0 deletions
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3
include/uapi/linux/tcp.h
View File

@ -196,6 +196,9 @@ struct tcp_info {
__u64 tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
__u32 tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
__u32 tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
__u32 tcpi_notsent_bytes;
__u32 tcpi_min_rtt;
};
/* for TCP_MD5SIG socket option */

6
net/ipv4/tcp.c
View File

@ -2642,6 +2642,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
const struct inet_connection_sock *icsk = inet_csk(sk);
u32 now = tcp_time_stamp;
unsigned int start;
int notsent_bytes;
u64 rate64;
u32 rate;
@ -2722,6 +2723,11 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
} while (u64_stats_fetch_retry_irq(&tp->syncp, start));
info->tcpi_segs_out = tp->segs_out;
info->tcpi_segs_in = tp->segs_in;
notsent_bytes = READ_ONCE(tp->write_seq) - READ_ONCE(tp->snd_nxt);
info->tcpi_notsent_bytes = max(0, notsent_bytes);
info->tcpi_min_rtt = tcp_min_rtt(tp);
}
EXPORT_SYMBOL_GPL(tcp_get_info);