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Commit 4507a715 authored by Richard Cochran's avatar Richard Cochran Committed by David S. Miller
Browse files

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: default avatarRichard Cochran <richard.cochran@omicron.at>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ad1afb00

include/linux/skbuff.h

+21 −0
Original line number Diff line number Diff line
@@ -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);