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tcp: add tcpi_segs_in and tcpi_segs_out to tcp_info

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This patch tracks the total number of inbound and outbound segments on a
TCP socket. One may use this number to have an idea on connection
quality when compared against the retransmissions.

RFC4898 named these : tcpEStatsPerfSegsIn and tcpEStatsPerfSegsOut

These are a 32bit field each and can be fetched both from TCP_INFO
getsockopt() if one has a handle on a TCP socket, or from inet_diag
netlink facility (iproute2/ss patch will follow)

Note that tp->segs_out was placed near tp->snd_nxt for good data
locality and minimal performance impact, while tp->segs_in was placed
near tp->bytes_received for the same reason.

Join work with Eric Dumazet.

Note that received SYN are accounted on the listener, but sent SYNACK
are not accounted.

Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Change-Id: Ic3e5daea102e13fb24c5fb1ce6913d5ece13c521
This commit is contained in:
Marcelo Ricardo Leitner 2015-05-20 16:35:41 -07:00 committed by surblazer
parent 2afbb021d9
commit 461a9cb3c4
6 changed files with 16 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
include/linux/tcp.h
View file

@ -171,8 +171,10 @@ struct tcp_info {
__u64 tcpi_pacing_rate;
__u64 tcpi_max_pacing_rate;
__u64 tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */
__u64 tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */
__u64 tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
__u32 tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
__u32 tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
};
/* for TCP_MD5SIG socket option */
@ -323,11 +325,16 @@ struct tcp_sock {
* sum(delta(rcv_nxt)), or how many bytes
* were acked.
*/
u32 segs_in; /* RFC4898 tcpEStatsPerfSegsIn
* total number of segments in.
*/
u32 rcv_nxt; /* What we want to receive next */
u32 copied_seq; /* Head of yet unread data */
u32 rcv_wup; /* rcv_nxt on last window update sent */
u32 snd_nxt; /* Next sequence we send */
u32 segs_out; /* RFC4898 tcpEStatsPerfSegsOut
* The total number of segments sent.
*/
u64 bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked
* sum(delta(snd_una)), or how many bytes
* were acked.

2
net/ipv4/tcp.c
View file

@ -2569,6 +2569,8 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
spin_lock_bh(&sk->sk_lock.slock);
info->tcpi_bytes_acked = tp->bytes_acked;
info->tcpi_bytes_received = tp->bytes_received;
info->tcpi_segs_out = tp->segs_out;
info->tcpi_segs_in = tp->segs_in;
spin_unlock_bh(&sk->sk_lock.slock);
if (sk->sk_socket) {

1
net/ipv4/tcp_ipv4.c
View file

@ -1734,6 +1734,7 @@ process:
}
bh_lock_sock_nested(sk);
tcp_sk(sk)->segs_in += max_t(u16, 1, skb_shinfo(skb)->gso_segs);
ret = 0;
if (!sock_owned_by_user(sk)) {
#ifdef CONFIG_NET_DMA

1
net/ipv4/tcp_minisocks.c
View file

@ -464,6 +464,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
newtp->rcv_wup = newtp->copied_seq =
newtp->rcv_nxt = treq->rcv_isn + 1;
newtp->segs_in = 0;
newtp->snd_sml = newtp->snd_una =
newtp->snd_nxt = newtp->snd_up =

2
net/ipv4/tcp_output.c
View file

@ -902,6 +902,8 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
TCP_ADD_STATS(sock_net(sk), TCP_MIB_OUTSEGS,
tcp_skb_pcount(skb));
tp->segs_out += tcp_skb_pcount(skb);
err = icsk->icsk_af_ops->queue_xmit(skb, &inet->cork.fl);
if (likely(err <= 0))
return err;

1
net/ipv6/tcp_ipv6.c
View file

@ -1660,6 +1660,7 @@ process:
}
bh_lock_sock_nested(sk);
tcp_sk(sk)->segs_in += max_t(u16, 1, skb_shinfo(skb)->gso_segs);
ret = 0;
if (!sock_owned_by_user(sk)) {
#ifdef CONFIG_NET_DMA