[virtio-comment] [PATCH REQUIREMENTS v2 6/7] net-features: Add packet timestamp requirements

[Parav Pandit <parav@nvidia.com>]

Add tx and rx packet timestamp requirements.

Signed-off-by: Parav Pandit <parav@nvidia.com>
---
 net-workstream/features-1.4.md | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/net-workstream/features-1.4.md b/net-workstream/features-1.4.md
index ae40ee8..466e4db 100644
--- a/net-workstream/features-1.4.md
+++ b/net-workstream/features-1.4.md
@@ -10,6 +10,7 @@ together is desired while updating the virtio net interface.
 2. Low latency tx and rx virtqueues for PCI transport
 3. Virtqueue notification coalescing re-arming support
 4  Virtqueue receive flow filters (RFF)
+5. Device timestamp for tx and rx packets
 
 # 3. Requirements
 ## 3.1 Device counters
@@ -267,3 +268,28 @@ struct virtio_net_rff_delete {
 	u8 padding[2];
 	le32 flow_id;
 };
+
+## 3.5 Packet timestamp
+1. Device should provide transmit timestamp and receive timestamp of the packets
+   at per packet level when the device is enabled.
+2. Device should provide the current free running clock in the least latency
+   possible using an MMIO register read of 64-bit to have the least jitter.
+3. Device should provide the current frequency and the frequency unit for the
+   software to synchronize the reference point of software and the device using
+   a control vq command.
+
+### 3.5.1 Transmit timestamp
+1. Transmit completion must contain a packet transmission timestamp when the
+   device is enabled for it.
+2. The device should record the packet transmit timestamp in the completion at
+   the farthest egress point towards the network.
+3. The device must provide a transmit packet timestamp in a single DMA
+   transaction along with the rest of the transmit completion fields.
+
+### 3.5.2 Receive timestamp
+1. Receive completion must contain a packet reception timestamp when the device
+   is enabled for it.
+2. The device should record the received packet timestamp at the closet ingress
+   point of reception from the network.
+3. The device should provide a receive packet timestamp in a single DMA
+   transaction along with the rest of the receive completion fields.
-- 
2.26.2


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