Re: [net-next v3 2/2] net: sched: support hash/classid/cpuid selecting tx queue

On Sun, Dec 12, 2021 at 10:19 AM Cong Wang [off-list ref] wrote:

On Thu, Dec 9, 2021 at 6:36 PM [off-list ref] wrote:

quoted

From: Tonghao Zhang <redacted>

This patch allows users to select queue_mapping, range
from A to B. And users can use skb-hash, cgroup classid
and cpuid to select Tx queues. Then we can load balance
packets from A to B queue. The range is an unsigned 16bit
value in decimal format.

$ tc filter ... action skbedit queue_mapping hash-type normal A B

"skbedit queue_mapping QUEUE_MAPPING" (from "man 8 tc-skbedit") is
enhanced with flags:
* SKBEDIT_F_QUEUE_MAPPING_HASH
* SKBEDIT_F_QUEUE_MAPPING_CLASSID
* SKBEDIT_F_QUEUE_MAPPING_CPUID

With act_bpf you can do all of them... So why do you have to do it
in skbedit?

Hi Cong
This idea is inspired by skbedit queue_mapping, and skbedit is
enhanced by this patch.
We support this in skbedit firstly in production. act_bpf can do more
things than this. Anyway we
can support this in both act_skbedit/acc_bpf. 1/2 is changed from
skip_tx_queue in skb to per-cpu var suggested-by Eric. We need another
patch which can change the
per-cpu var in bpf. I will post this patch later.


-- 
Best regards, Tonghao