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| author | Marcelo Ricardo Leitner <mleitner@redhat.com> | 2015-05-20 16:35:41 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-05-21 23:25:21 -0400 |
| commit | 2efd055c53c06b7e89c167c98069bab9afce7e59 (patch) | |
| tree | 4930a37c5ae972395c0945d6b786ad1e1fd07c0e /net/ipv4/tcp_output.c | |
| parent | 48ed7b26faa758e6612cd1fb11c07f25cd54f771 (diff) | |
| download | blackbird-obmc-linux-2efd055c53c06b7e89c167c98069bab9afce7e59.tar.gz blackbird-obmc-linux-2efd055c53c06b7e89c167c98069bab9afce7e59.zip | |
tcp: add tcpi_segs_in and tcpi_segs_out to tcp_info
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>
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 3aebe0157dfa..534e5fdb04c1 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1027,6 +1027,7 @@ 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); /* OK, its time to fill skb_shinfo(skb)->gso_segs */ skb_shinfo(skb)->gso_segs = tcp_skb_pcount(skb); |
