On Tue, Jun 10, 2025 at 01:11:59PM +0000, Soumyadeep Hore wrote: > E830 adapters currently support Tx Time based queues. > > Signed-off-by: Soumyadeep Hore <soumyadeep.h...@intel.com> > --- > doc/guides/nics/ice.rst | 18 ++++++++++++++++++ > 1 file changed, 18 insertions(+) > > diff --git a/doc/guides/nics/ice.rst b/doc/guides/nics/ice.rst > index 77985ae5a2..f284c78290 100644 > --- a/doc/guides/nics/ice.rst > +++ b/doc/guides/nics/ice.rst > @@ -415,6 +415,24 @@ and add the ``--force-max-simd-bitwidth=64`` startup > parameter to disable vector > > examples/dpdk-ptpclient -c f -n 3 -a 0000:ec:00.1 > --force-max-simd-bitwidth=64 -- -T 1 -p 0x1 -c 1 > > +Tx Packet Pacing > +~~~~~~~~~~~~~~~~ > + > +In order to deliver the timestamp with every packet, a special type of Tx > Host Queue is > +used, the TS Queue. This feature is currently supported only in E830 > adapters. > + > +The tx_offload ``RTE_ETH_TX_OFFLOAD_SEND_ON_TIMESTAMP`` is used to enable > the feature. > +In order to deliver timestamps internally ``set txtimes`` is used where > inter burst > +and intra burst time interval in nsecs is provided. > +For example: > + > +.. code-block:: console > + > + dpdk-testpmd -a 0000:31:00.0 -c f -n 4 -- -i --tx-offloads=0x200000 > + set fwd txonly > + set txtimes <inter_burst>,<intra_burst> > + start > +
Thanks, this is good as an example for someone wanting to test out the feature using testpmd. However, for someone wanting to use send-on-timestamp in their application, is there already documentation somewhere on how to use it via C APIs, and what mbuf fields to write with what data? IF so, please link to it. If not, we need some summary of how to use here. Thanks, /Bruce
