E830 adapters currently support Tx Time based queues.
Signed-off-by: Soumyadeep Hore <soumyadeep.h...@intel.com>
---
doc/guides/nics/ice.rst | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/doc/guides/nics/ice.rst b/doc/guides/nics/ice.rst
index 77985ae5a2..fe3e87c704 100644
--- a/doc/guides/nics/ice.rst
+++ b/doc/guides/nics/ice.rst
@@ -415,6 +415,33 @@ 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
+
+Based on the tx_offload initialised during port configuration time,
+Tx Time Queue will be enabled during ice_tx_queue_setup() only for E830
adapters.
+The initial time should be fetched using rte_eth_read_clock().
+Further the timestamps should be calculated based on the inter_burst and
intra_burst times,
+then storing it into proper format (Refer to ``struct tx_timestamp`` in
tx_only.c),
+as to be placed in packet header.
+The timestamps should be copied to packet mbufs and manually adjust packet
header length accordingly.
+
Generic Flow Support
~~~~~~~~~~~~~~~~~~~~
--
2.43.0
