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.
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