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net: add driver hook for tx time stamping.

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This patch adds a hook for transmit time stamps. The transmit hook
allows a software fallback for transmit time stamps, for MACs
lacking time stamping hardware. Using the hook will still require
adding an inline function call to each MAC driver.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran 2010-07-17 08:48:28 +00:00 committed by David S. Miller
parent ad1afb0039
commit 4507a71507
1 changed files with 21 additions and 0 deletions
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21
include/linux/skbuff.h
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@ -1947,6 +1947,27 @@ static inline ktime_t net_invalid_timestamp(void)
extern void skb_tstamp_tx(struct sk_buff *orig_skb,
struct skb_shared_hwtstamps *hwtstamps);
static inline void sw_tx_timestamp(struct sk_buff *skb)
{
union skb_shared_tx *shtx = skb_tx(skb);
if (shtx->software && !shtx->in_progress)
skb_tstamp_tx(skb, NULL);
}
/**
* skb_tx_timestamp() - Driver hook for transmit timestamping
*
* Ethernet MAC Drivers should call this function in their hard_xmit()
* function as soon as possible after giving the sk_buff to the MAC
* hardware, but before freeing the sk_buff.
*
* @skb: A socket buffer.
*/
static inline void skb_tx_timestamp(struct sk_buff *skb)
{
sw_tx_timestamp(skb);
}
extern __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len);
extern __sum16 __skb_checksum_complete(struct sk_buff *skb);