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* rte_flow MARK + JUMP with mlx5
@ 2021-11-11 12:48 Daniel Romell
  2021-11-12  9:34 ` Tom Barbette
  0 siblings, 1 reply; 3+ messages in thread
From: Daniel Romell @ 2021-11-11 12:48 UTC (permalink / raw)
  To: users; +Cc: orika, andrew.rybchenko, barbette

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Hey all!

A few questions about rte_flow, specifically the MARK + JUMP actions;

What's the expected behavior of MARK + JUMP in the same flow? Is the mark expected to survive to the target flow group? Is it driver specific? Undefined? Unsupported?

For example, when testing with the following flow setup in testpmd (mlx CX6, DPDK 19.11.2 and latest mainline), none of the received packets are marked:

flow create 0 ingress pattern eth / end actions mark id 0x1337 / jump group 1 / end
flow create 0 ingress group 1 pattern eth / end actions queue index 0 / end

A single flow with MARK + QUEUE works as expected.

What I want in the end is a set of simple RSS rules that would match most of the traffic, and another set of rules that would mark a small subset of the traffic before being processed by the RSS rule.

I realize I *could* duplicate the RSS actions and have them in the same rule as the MARK, but that just seems like the wrong thing to do for a few different reasons;
* It would require one flow for each combination of MARK and RSS condition.
* The MARK rules should be inserted and removed during runtime, while the RSS rules should be long-lived and static.
* The code inserting the MARK rule ideally shouldn't have be aware of the RSS config (other than that it should continue to a new group for further matching).

What's the right way of doing something like this with DPDK?
I've already implemented the same thing with a custom/proprietary mlx driver, so I know it should be doable. What I ended up doing there was simply to have two flow tables. The root table (level 0) holds all "mark" rules (flow tag), and forwards to everything (including misses) to the next table. The table at level 1 contains the RSS rules, and leaves all flows untagged so the tag set in the first level is preserved. Is there a way to get to a similar setup through the rte_flow API?

Thanks,
Daniel Romell

(CCs as suggested by Thomas in slack + Tom as this seems somewhat similar to https://www.mail-archive.com/users@dpdk.org/msg03900.html)


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^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2021-11-16  8:24 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-11-11 12:48 rte_flow MARK + JUMP with mlx5 Daniel Romell
2021-11-12  9:34 ` Tom Barbette
2021-11-16  8:24   ` Daniel Romell

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