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net-timestamp: extend SCM_TIMESTAMPING ancillary data struct 

Applications that request kernel tx timestamps with SO_TIMESTAMPING
read timestamps as recvmsg() ancillary data. The response is defined
implicitly as timespec[3].

1) define struct scm_timestamping explicitly and

2) add support for new tstamp types. On tx, scm_timestamping always
   accompanies a sock_extended_err. Define previously unused field
   ee_info to signal the type of ts[0]. Introduce SCM_TSTAMP_SND to
   define the existing behavior.

The reception path is not modified. On rx, no struct similar to
sock_extended_err is passed along with SCM_TIMESTAMPING.

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 22:11:45 -04:00 committed by David S. Miller
parent a2b81b35f9
commit f24b9be595
5 changed files with 36 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/skbuff.h
View File

@ -249,6 +249,9 @@ enum {
SKBTX_SHARED_FRAG = 1 << 5,
};
#define SKBTX_ANY_SW_TSTAMP SKBTX_SW_TSTAMP
#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP)
/*
* The callback notifies userspace to release buffers when skb DMA is done in
* lower device, the skb last reference should be 0 when calling this.

4
include/net/sock.h
View File

@ -2169,7 +2169,9 @@ sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
*/
if (sock_flag(sk, SOCK_RCVTSTAMP) ||
sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) ||
(kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) ||
(kt.tv64 &&
(sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) ||
skb_shinfo(skb)->tx_flags & SKBTX_ANY_SW_TSTAMP)) ||
(hwtstamps->hwtstamp.tv64 &&
sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)))
__sock_recv_timestamp(msg, sk, skb);

18
include/uapi/linux/errqueue.h
View File

@ -22,5 +22,23 @@ struct sock_extended_err {
#define SO_EE_OFFENDER(ee) ((struct sockaddr*)((ee)+1))
/**
* struct scm_timestamping - timestamps exposed through cmsg
*
* The timestamping interfaces SO_TIMESTAMPING, MSG_TSTAMP_*
* communicate network timestamps by passing this struct in a cmsg with
* recvmsg(). See Documentation/networking/timestamping.txt for details.
*/
struct scm_timestamping {
struct timespec ts[3];
};
/* The type of scm_timestamping, passed in sock_extended_err ee_info.
* This defines the type of ts[0]. For SCM_TSTAMP_SND only, if ts[0]
* is zero, then this is a hardware timestamp and recorded in ts[2].
*/
enum {
SCM_TSTAMP_SND, /* driver passed skb to NIC, or HW */
};
#endif /* _UAPI_LINUX_ERRQUEUE_H */

1
net/core/skbuff.c
View File

@ -3521,6 +3521,7 @@ void skb_tstamp_tx(struct sk_buff *orig_skb,
memset(serr, 0, sizeof(*serr));
serr->ee.ee_errno = ENOMSG;
serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
serr->ee.ee_info = SCM_TSTAMP_SND;
err = sock_queue_err_skb(sk, skb);

20
net/socket.c
View File

@ -106,6 +106,7 @@
#include <linux/sockios.h>
#include <linux/atalk.h>
#include <net/busy_poll.h>
#include <linux/errqueue.h>
#ifdef CONFIG_NET_RX_BUSY_POLL
unsigned int sysctl_net_busy_read __read_mostly;
@ -697,7 +698,7 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
struct sk_buff *skb)
{
int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
struct timespec ts[3];
struct scm_timestamping tss;
int empty = 1;
struct skb_shared_hwtstamps *shhwtstamps =
skb_hwtstamps(skb);
@ -714,24 +715,25 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
sizeof(tv), &tv);
} else {
skb_get_timestampns(skb, &ts[0]);
struct timespec ts;
skb_get_timestampns(skb, &ts);
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
sizeof(ts[0]), &ts[0]);
sizeof(ts), &ts);
}
}
memset(ts, 0, sizeof(ts));
if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) &&
ktime_to_timespec_cond(skb->tstamp, ts + 0))
memset(&tss, 0, sizeof(tss));
if ((sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) ||
skb_shinfo(skb)->tx_flags & SKBTX_ANY_SW_TSTAMP) &&
ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
empty = 0;
if (shhwtstamps &&
sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts + 2))
ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
empty = 0;
if (!empty)
put_cmsg(msg, SOL_SOCKET,
SCM_TIMESTAMPING, sizeof(ts), &ts);
SCM_TIMESTAMPING, sizeof(tss), &tss);
}
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);