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authorEric Dumazet <edumazet@google.com>2016-02-12 09:02:53 +0300
committerDavid S. Miller <davem@davemloft.net>2016-02-17 04:27:35 +0300
commitcd9b266095f422267bddbec88f9098b48ea548fc (patch)
tree0b7f6c9c5660fbdf2e0e78112780ce1a16eff7a3 /net/ipv4/tcp.c
parent4cba259f198b93d514ed7be44a7d679c83e7d9f1 (diff)
downloadlinux-cd9b266095f422267bddbec88f9098b48ea548fc.tar.xz
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>
Diffstat (limited to 'net/ipv4/tcp.c')
-rw-r--r--net/ipv4/tcp.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 014f18e2f7b3..f93150d15199 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -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);