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net-timestamp: ACK timestamp for bytestreams

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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>
This commit is contained in:
Willem de Bruijn 2014-08-04 22:11:50 -04:00 committed by David S. Miller
parent 4ed2d765df
commit e1c8a607b2
5 changed files with 17 additions and 2 deletions
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7
include/linux/skbuff.h
View File

@ -250,9 +250,14 @@ enum {
/* generate software time stamp when entering packet scheduling */
SKBTX_SCHED_TSTAMP = 1 << 6,
/* generate software timestamp on peer data acknowledgment */
SKBTX_ACK_TSTAMP = 1 << 7,
};
#define SKBTX_ANY_SW_TSTAMP (SKBTX_SW_TSTAMP | SKBTX_SCHED_TSTAMP)
#define SKBTX_ANY_SW_TSTAMP (SKBTX_SW_TSTAMP | \
SKBTX_SCHED_TSTAMP | \
SKBTX_ACK_TSTAMP)
#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP)
/*

1
include/uapi/linux/errqueue.h
View File

@ -40,6 +40,7 @@ struct scm_timestamping {
enum {
SCM_TSTAMP_SND, /* driver passed skb to NIC, or HW */
SCM_TSTAMP_SCHED, /* data entered the packet scheduler */
SCM_TSTAMP_ACK, /* data acknowledged by peer */
};
#endif /* _UAPI_LINUX_ERRQUEUE_H */

3
include/uapi/linux/net_tstamp.h
View File

@ -22,8 +22,9 @@ enum {
SOF_TIMESTAMPING_RAW_HARDWARE = (1<<6),
SOF_TIMESTAMPING_OPT_ID = (1<<7),
SOF_TIMESTAMPING_TX_SCHED = (1<<8),
SOF_TIMESTAMPING_TX_ACK = (1<<9),
SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_TX_SCHED,
SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_TX_ACK,
SOF_TIMESTAMPING_MASK = (SOF_TIMESTAMPING_LAST - 1) |
SOF_TIMESTAMPING_LAST
};

6
net/ipv4/tcp_input.c
View File

@ -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;

2
net/socket.c
View File

@ -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;