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
