netdev - Re: [PATCH net-next 1/1] net/sched: Introduce skb hash classifier

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Date:   Sun, 9 Aug 2020 11:15:58 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...nulli.us>,
        Ariel Levkovich <lariel@...lanox.com>
Subject: Re: [PATCH net-next 1/1] net/sched: Introduce skb hash classifier

On Fri, Aug 7, 2020 at 3:28 PM Jamal Hadi Salim <jhs@...atatu.com> wrote:
>
> From: Jamal Hadi Salim <jhs@...atatu.com>
>
> his classifier, in the same spirit as the tc skb mark classifier,
> provides a generic (fast lookup) approach to filter on the hash value
> and optional mask.
>
> like skb->mark, skb->hash could be set by multiple entities in the
> datapath including but not limited to hardware offloaded classification
> policies, hardware RSS (which already sets it today), XDP, ebpf programs
> and even by other tc actions like skbedit and IFE.

Looks like a lot of code duplication with cls_fw, is there any way to
reuse the code?

And I wonder if it is time to introduce a filter to match multiple skb
fields, as adding a filter for each skb field clearly does not scale.
Perhaps something like:

$TC filter add dev $DEV1 parent ffff: protocol ip prio 3 handle X skb \
hash Y mark Z flowid 1:12

Thanks.