Re: [PATCH bpf-next v3 2/3] net: stmmac: add Launch Time support to XDP ZC

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On 12/3/23 17:51, Song Yoong Siang wrote:
This patch enables Launch Time (Time-Based Scheduling) support to XDP zero
copy via XDP Tx metadata framework.

Signed-off-by: Song Yoong Siang<yoong.siang.song@xxxxxxxxx>
---
  drivers/net/ethernet/stmicro/stmmac/stmmac.h      |  2 ++

As requested before, I think we need to see another driver implementing this.

I propose driver igc and chip i225.

The interesting thing for me is to see how the LaunchTime max 1 second
into the future[1] is handled code wise. One suggestion is to add a section to Documentation/networking/xsk-tx-metadata.rst per driver that mentions/documents these different hardware limitations. It is natural that different types of hardware have limitations. This is a close-to hardware-level abstraction/API, and IMHO as long as we document the limitations we can expose this API without too many limitations for more capable hardware.

[1] https://github.com/xdp-project/xdp-project/blob/master/areas/tsn/code01_follow_qdisc_TSN_offload.org#setup-code-driver-igb

This stmmac driver and Intel Tiger Lake CPU must also have some limit on how long into the future it will/can schedule packets?


People from xdp-hints list must make their voice hear if they want i210 and igb driver support, because it have even-more hardware limitations, see [1] (E.g. only TX queue 0 and 1 supports LaunchTime). BUT I know some have this hardware in production and might be motivated to get a functioning driver with this feature?

--Jesper




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