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sock: enable timestamping using control messages

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Currently, SOL_TIMESTAMPING can only be enabled using setsockopt.
This is very costly when users want to sample writes to gather
tx timestamps.

Add support for enabling SO_TIMESTAMPING via control messages by
using tsflags added in `struct sockcm_cookie` (added in the previous
patches in this series) to set the tx_flags of the last skb created in
a sendmsg. With this patch, the timestamp recording bits in tx_flags
of the skbuff is overridden if SO_TIMESTAMPING is passed in a cmsg.

Please note that this is only effective for overriding the recording
timestamps flags. Users should enable timestamp reporting (e.g.,
SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_OPT_ID) using
socket options and then should ask for SOF_TIMESTAMPING_TX_*
using control messages per sendmsg to sample timestamps for each
write.

Signed-off-by: Soheil Hassas Yeganeh <[email protected]>
Acked-by: Willem de Bruijn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Soheil Hassas Yeganeh 2016-04-02 23:08:12 -04:00 • committed by David S. Miller
commit c14ac9451c
16 changed files with 93 additions and 49 deletions
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10
net/socket.c
View file

@ -587,20 +587,20 @@ void sock_release(struct socket *sock)
}
EXPORT_SYMBOL(sock_release);
void __sock_tx_timestamp(const struct sock *sk, __u8 *tx_flags)
void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
{
u8 flags = *tx_flags;
if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
flags |= SKBTX_HW_TSTAMP;
if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
flags |= SKBTX_SW_TSTAMP;
if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED)
if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
flags |= SKBTX_SCHED_TSTAMP;
if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK)
if (tsflags & SOF_TIMESTAMPING_TX_ACK)
flags |= SKBTX_ACK_TSTAMP;
*tx_flags = flags;