[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]
Subject: [PATCH requirements v4 6/7] net-features: Add packet timestamp requirements
Add tx and rx packet timestamp requirements. Signed-off-by: Parav Pandit <parav@nvidia.com> Acked-by: David Edmondson <david.edmondson@oracle.com> --- changelog: v3->v4: - no change --- 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 78bb3d2..82b907a 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 @@ -334,3 +335,28 @@ a. Driver should be able to specify a specific packet byte offset, number b. Support RSS context, in addition to a specific RQ. c. If/when virtio switch object is implemented, support ingress/egress flow filters at the switch port level. + +## 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
[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]