[PATCH 6/7] pcapng: add user-supplied timestamp support

[Stephen Hemminger]

On Wed, 29 Apr 2026 03:31:10 -0400
Dawid Wesierski <dawid.wesierski at intel.com> wrote:

> From: Marek Kasiewicz <marek.kasiewicz at intel.com>
> 
> Add rte_pcapng_copy_ts() which accepts an optional timestamp parameter
> in nanoseconds. When the timestamp is non-zero, it is used directly
> instead of reading the TSC. This allows applications to provide
> hardware PTP timestamps from the NIC, enabling accurate packet capture
> with PTP-domain timing rather than host-local TSC values.
> 
> The existing rte_pcapng_copy() function is preserved as a static inline
> wrapper that passes zero for backward compatibility.
> 
> The TSC-to-epoch conversion in the write path is removed since callers
> providing hardware timestamps have already performed the conversion.
> 
> 
> Signed-off-by: Marek Kasiewicz <marek.kasiewicz at intel.com>
> Signed-off-by: Dawid Wesierski <dawid.wesierski at intel.com>

Rather than having two functions, it would simpler to just use function
versioning and add timestamp parameter. There is only one caller in the tree
right now.