On Thu, 18 Apr, 2024 01:25:00 -0400 Mateusz Polchlopek <mateusz.polchlo...@intel.com> wrote: > From: Jacob Keller <jacob.e.kel...@intel.com> > > Add support for receive timestamps to the Rx hotpath. This support only > works when using the flexible descriptor format, so make sure that we > request this format by default if we have receive timestamp support > available in the PTP capabilities. > > In order to report the timestamps to userspace, we need to perform > timestamp extension. The Rx descriptor does actually contain the "40 > bit" timestamp. However, upper 32 bits which contain nanoseconds are > conveniently stored separately in the descriptor. We could extract the > 32bits and lower 8 bits, then perform a bitwise OR to calculate the > 40bit value. This makes no sense, because the timestamp extension > algorithm would simply discard the lower 8 bits anyways. > > Thus, implement timestamp extension as iavf_ptp_extend_32b_timestamp(), > and extract and forward only the 32bits of nominal nanoseconds. > > Reviewed-by: Wojciech Drewek <wojciech.dre...@intel.com> > Signed-off-by: Jacob Keller <jacob.e.kel...@intel.com> > Signed-off-by: Mateusz Polchlopek <mateusz.polchlo...@intel.com> > ---
Reviewed-by: Rahul Rameshbabu <rrameshb...@nvidia.com>
