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net: allow simultaneous SW and HW transmit timestamping 

Add SOF_TIMESTAMPING_OPT_TX_SWHW option to allow an outgoing packet to
be looped to the socket's error queue with a software timestamp even
when a hardware transmit timestamp is expected to be provided by the
driver.

Applications using this option will receive two separate messages from
the error queue, one with a software timestamp and the other with a
hardware timestamp. As the hardware timestamp is saved to the shared skb
info, which may happen before the first message with software timestamp
is received by the application, the hardware timestamp is copied to the
SCM_TIMESTAMPING control message only when the skb has no software
timestamp or it is an incoming packet.

While changing sw_tx_timestamp(), inline it in skb_tx_timestamp() as
there are no other users.

CC: Richard Cochran <richardcochran@gmail.com>
CC: Willem de Bruijn <willemb@google.com>
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Miroslav Lichvar 2017-05-19 17:52:40 +02:00 committed by David S. Miller
parent 67953d47bb
commit b50a5c70ff
5 changed files with 34 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/networking/timestamping.txt
View File

@ -203,6 +203,14 @@ SOF_TIMESTAMPING_OPT_PKTINFO:
enabled and the driver is using NAPI. The struct contains also two
other fields, but they are reserved and undefined.
SOF_TIMESTAMPING_OPT_TX_SWHW:
Request both hardware and software timestamps for outgoing packets
when SOF_TIMESTAMPING_TX_HARDWARE and SOF_TIMESTAMPING_TX_SOFTWARE
are enabled at the same time. If both timestamps are generated,
two separate messages will be looped to the socket's error queue,
each containing just one timestamp.
New applications are encouraged to pass SOF_TIMESTAMPING_OPT_ID to
disambiguate timestamps and SOF_TIMESTAMPING_OPT_TSONLY to operate
regardless of the setting of sysctl net.core.tstamp_allow_data.

10
include/linux/skbuff.h
View File

@ -3259,13 +3259,6 @@ void __skb_tstamp_tx(struct sk_buff *orig_skb,
void skb_tstamp_tx(struct sk_buff *orig_skb,
struct skb_shared_hwtstamps *hwtstamps);
static inline void sw_tx_timestamp(struct sk_buff *skb)
{
if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP &&
!(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
skb_tstamp_tx(skb, NULL);
}
/**
* skb_tx_timestamp() - Driver hook for transmit timestamping
*
@ -3281,7 +3274,8 @@ static inline void sw_tx_timestamp(struct sk_buff *skb)
static inline void skb_tx_timestamp(struct sk_buff *skb)
{
skb_clone_tx_timestamp(skb);
sw_tx_timestamp(skb);
if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP)
skb_tstamp_tx(skb, NULL);
}
/**

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

@ -28,8 +28,9 @@ enum {
SOF_TIMESTAMPING_OPT_TSONLY = (1<<11),
SOF_TIMESTAMPING_OPT_STATS = (1<<12),
SOF_TIMESTAMPING_OPT_PKTINFO = (1<<13),
SOF_TIMESTAMPING_OPT_TX_SWHW = (1<<14),
SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_OPT_PKTINFO,
SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_OPT_TX_SWHW,
SOF_TIMESTAMPING_MASK = (SOF_TIMESTAMPING_LAST - 1) |
SOF_TIMESTAMPING_LAST
};

4
net/core/skbuff.c
View File

@ -3901,6 +3901,10 @@ void __skb_tstamp_tx(struct sk_buff *orig_skb,
if (!sk)
return;
if (!hwtstamps && !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_TX_SWHW) &&
skb_shinfo(orig_skb)->tx_flags & SKBTX_IN_PROGRESS)
return;
tsonly = sk->sk_tsflags & SOF_TIMESTAMPING_OPT_TSONLY;
if (!skb_may_tx_timestamp(sk, tsonly))
return;

20
net/socket.c
View File

@ -662,6 +662,19 @@ static bool skb_is_err_queue(const struct sk_buff *skb)
return skb->pkt_type == PACKET_OUTGOING;
}
/* On transmit, software and hardware timestamps are returned independently.
* As the two skb clones share the hardware timestamp, which may be updated
* before the software timestamp is received, a hardware TX timestamp may be
* returned only if there is no software TX timestamp. Ignore false software
* timestamps, which may be made in the __sock_recv_timestamp() call when the
* option SO_TIMESTAMP(NS) is enabled on the socket, even when the skb has a
* hardware timestamp.
*/
static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
{
return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
}
static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
{
struct scm_ts_pktinfo ts_pktinfo;
@ -691,14 +704,16 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
{
int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
struct scm_timestamping tss;
int empty = 1;
int empty = 1, false_tstamp = 0;
struct skb_shared_hwtstamps *shhwtstamps =
skb_hwtstamps(skb);
/* Race occurred between timestamp enabling and packet
receiving. Fill in the current time for now. */
if (need_software_tstamp && skb->tstamp == 0)
if (need_software_tstamp && skb->tstamp == 0) {
__net_timestamp(skb);
false_tstamp = 1;
}
if (need_software_tstamp) {
if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
@ -720,6 +735,7 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
empty = 0;
if (shhwtstamps &&
(sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
!skb_is_swtx_tstamp(skb, false_tstamp) &&
ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
empty = 0;
if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&