HW RX timestamp with LRO enabled on ConnectX-7 (DPDK 20.11)

[Yoon Junghan]

Hello,

I'm currently using DPDK 20.11 with a ConnectX-7 NIC, and I'm trying to retrieve RX hardware timestamps using `rte_mbuf_dyn_rx_timestamp_register()`.

When LRO is enabled, I notice that LROed mbufs seem to share identical timestamp values, and the timestamps are unexpectedly large or inconsistent. This raises the question of whether LRO is interfering with the correctness of the RX HW timestamps.

I’d appreciate any clarification on whether HW RX timestamping is reliable when LRO is enabled on this platform, or if LRO should be just disabled for accurate per-packet timestamping.


Sincerely,
Junghan Yoon
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mails.dpdk.org/archives/users/attachments/20250722/6d57f0bd/attachment.htm>