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Date: Wed, 28 Feb 2007 14:37:49 +0100 From: John <linux.kernel@...e.fr> To: linux-net@...r.kernel.org CC: netdev@...r.kernel.org, linux.kernel@...e.fr Subject: Re: CLOCK_MONOTONIC datagram timestamps by the kernel John wrote: > I know it's possible to have Linux timestamp incoming datagrams as soon > as they are received, then for one to retrieve this timestamp later with > an ioctl command or a recvmsg call. Has it ever been proposed to modify struct skb_timeval to hold nanosecond stamps instead of just microsecond stamps? Then make the improved precision somehow available to user space. On a related note, the comment for skb_set_timestamp() states: /** * skb_set_timestamp - set timestamp of a skb * @skb: skb to set stamp of * @stamp: pointer to struct timeval to get stamp from * * Timestamps are stored in the skb as offsets to a base timestamp. * This function converts a struct timeval to an offset and stores * it in the skb. */ But there is no mention of an offset in the code: static inline void skb_set_timestamp( struct sk_buff *skb, const struct timeval *stamp) { skb->tstamp.off_sec = stamp->tv_sec; skb->tstamp.off_usec = stamp->tv_usec; } Likewise for skb_get_timestamp: /** * skb_get_timestamp - get timestamp from a skb * @skb: skb to get stamp from * @stamp: pointer to struct timeval to store stamp in * * Timestamps are stored in the skb as offsets to a base timestamp. * This function converts the offset back to a struct timeval and stores * it in stamp. */ static inline void skb_get_timestamp( const struct sk_buff *skb, struct timeval *stamp) { stamp->tv_sec = skb->tstamp.off_sec; stamp->tv_usec = skb->tstamp.off_usec; } Are the comments related to code that has since been modified? Regards. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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