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authorMarcelo Ricardo Leitner <mleitner@redhat.com>2015-05-20 16:35:41 -0700
committerDavid S. Miller <davem@davemloft.net>2015-05-21 23:25:21 -0400
commit2efd055c53c06b7e89c167c98069bab9afce7e59 (patch)
tree4930a37c5ae972395c0945d6b786ad1e1fd07c0e /include/linux/tcp.h
parent48ed7b26faa758e6612cd1fb11c07f25cd54f771 (diff)
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 'include/linux/tcp.h')
-rw-r--r--include/linux/tcp.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index e6fb5df22db1..f0212026c77f 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -149,11 +149,16 @@ 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.