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packet: tx timestamping on tpacket ring

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When transmit timestamping is enabled at the socket level, record a
timestamp on packets written to a PACKET_TX_RING. Tx timestamps are
always looped to the application over the socket error queue. Software
timestamps are also written back into the packet frame header in the
packet ring.

Reported-by: Paul Chavent <paul.chavent@onera.fr>
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
2013-04-23 00:39:28 +00:00
committed by David S. Miller
parent 92dea7c066
commit 2e31396fa1
2 changed files with 39 additions and 6 deletions
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12
net/core/skbuff.c
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@@ -3327,12 +3327,8 @@ void skb_tstamp_tx(struct sk_buff *orig_skb,
if (!sk)
return;
skb = skb_clone(orig_skb, GFP_ATOMIC);
if (!skb)
return;
if (hwtstamps) {
*skb_hwtstamps(skb) =
*skb_hwtstamps(orig_skb) =
*hwtstamps;
} else {
/*
@@ -3340,9 +3336,13 @@ void skb_tstamp_tx(struct sk_buff *orig_skb,
* so keep the shared tx_flags and only
* store software time stamp
*/
skb->tstamp = ktime_get_real();
orig_skb->tstamp = ktime_get_real();
}
skb = skb_clone(orig_skb, GFP_ATOMIC);
if (!skb)
return;
serr = SKB_EXT_ERR(skb);
memset(serr, 0, sizeof(*serr));
serr->ee.ee_errno = ENOMSG;