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authorWillem de Bruijn <willemb@google.com>2014-08-04 22:11:50 -0400
committerDavid S. Miller <davem@davemloft.net>2014-08-05 16:35:54 -0700
commite1c8a607b28190cd09a271508aa3025d3c2f312e (patch)
tree83f4b5e777a13535434be99bee2e764a6677e647 /net
parent4ed2d765dfaccff5ebdac68e2064b59125033a3b (diff)
downloadlinux-e1c8a607b28190cd09a271508aa3025d3c2f312e.tar.gz
net-timestamp: ACK timestamp for bytestreams
Add SOF_TIMESTAMPING_TX_ACK, a request for a tstamp when the last byte in the send() call is acknowledged. It implements the feature for TCP. The timestamp is generated when the TCP socket cumulative ACK is moved beyond the tracked seqno for the first time. The feature ignores SACK and FACK, because those acknowledge the specific byte, but not necessarily the entire contents of the buffer up to that byte. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_input.c6
-rw-r--r--net/socket.c2
2 files changed, 8 insertions, 0 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 6a2984507755..a3d47af01906 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -74,6 +74,7 @@
#include <linux/ipsec.h>
#include <asm/unaligned.h>
#include <net/netdma.h>
+#include <linux/errqueue.h>
int sysctl_tcp_timestamps __read_mostly = 1;
int sysctl_tcp_window_scaling __read_mostly = 1;
@@ -3106,6 +3107,11 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
tp->retrans_stamp = 0;
}
+ if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_ACK_TSTAMP) &&
+ between(skb_shinfo(skb)->tskey, prior_snd_una,
+ tp->snd_una + 1))
+ __skb_tstamp_tx(skb, NULL, sk, SCM_TSTAMP_ACK);
+
if (!fully_acked)
break;
diff --git a/net/socket.c b/net/socket.c
index 3a2778d71631..ae89569a2db5 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -619,6 +619,8 @@ void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
*tx_flags |= SKBTX_SW_TSTAMP;
if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED)
*tx_flags |= SKBTX_SCHED_TSTAMP;
+ if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK)
+ *tx_flags |= SKBTX_ACK_TSTAMP;
if (sock_flag(sk, SOCK_WIFI_STATUS))
*tx_flags |= SKBTX_WIFI_STATUS;