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Commit cd9b2660 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4cba259f

include/uapi/linux/tcp.h

+3 −0
Original line number Diff line number Diff line
@@ -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 */

net/ipv4/tcp.c

+6 −0
Original line number Diff line number Diff line
@@ -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);