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net: timestamp: add helper returning skb's tx tstamp

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Add a helper function skb_get_tx_timestamp() that returns a tx timestamp
associated with an error queue skb.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/702357dd8936ef4c0d3864441e853bfe3224a677.1750065793.git.asml.silence@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pavel Begunkov
2025-06-16 10:46:25 +01:00
committed by Jakub Kicinski
parent 19272b37aa
commit 2410251cde
2 changed files with 50 additions and 0 deletions
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46
net/socket.c
View File

@@ -843,6 +843,52 @@ static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb,
sizeof(ts_pktinfo), &ts_pktinfo);
}
bool skb_has_tx_timestamp(struct sk_buff *skb, const struct sock *sk)
{
const struct sock_exterr_skb *serr = SKB_EXT_ERR(skb);
u32 tsflags = READ_ONCE(sk->sk_tsflags);
if (serr->ee.ee_errno != ENOMSG ||
serr->ee.ee_origin != SO_EE_ORIGIN_TIMESTAMPING)
return false;
/* software time stamp available and wanted */
if ((tsflags & SOF_TIMESTAMPING_SOFTWARE) && skb->tstamp)
return true;
/* hardware time stamps available and wanted */
return (tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
skb_hwtstamps(skb)->hwtstamp;
}
int skb_get_tx_timestamp(struct sk_buff *skb, struct sock *sk,
struct timespec64 *ts)
{
u32 tsflags = READ_ONCE(sk->sk_tsflags);
ktime_t hwtstamp;
int if_index = 0;
if ((tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
ktime_to_timespec64_cond(skb->tstamp, ts))
return SOF_TIMESTAMPING_TX_SOFTWARE;
if (!(tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) ||
skb_is_swtx_tstamp(skb, false))
return -ENOENT;
if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP_NETDEV)
hwtstamp = get_timestamp(sk, skb, &if_index);
else
hwtstamp = skb_hwtstamps(skb)->hwtstamp;
if (tsflags & SOF_TIMESTAMPING_BIND_PHC)
hwtstamp = ptp_convert_timestamp(&hwtstamp,
READ_ONCE(sk->sk_bind_phc));
if (!ktime_to_timespec64_cond(hwtstamp, ts))
return -ENOENT;
return SOF_TIMESTAMPING_TX_HARDWARE;
}
/*
* called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
*/