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| author | Richard Cochran <richardcochran@gmail.com> | 2010-07-17 08:48:28 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-07-18 19:15:25 -0700 |
| commit | 4507a71507d4ff37e9a499c4241b7701ed1feab4 (patch) | |
| tree | 775ff8a11852f37ebc78363cf41729221cd92718 /include/linux/skbuff.h | |
| parent | ad1afb00393915a51c21b1ae8704562bf036855f (diff) | |
| download | linux-4507a71507d4ff37e9a499c4241b7701ed1feab4.tar.gz linux-4507a71507d4ff37e9a499c4241b7701ed1feab4.tar.bz2 linux-4507a71507d4ff37e9a499c4241b7701ed1feab4.zip | |
net: add driver hook for tx time stamping.
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>
Diffstat (limited to 'include/linux/skbuff.h')
| -rw-r--r-- | include/linux/skbuff.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index ac74ee085d74..a1b0400c8d86 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -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); |