netdev - Re: [PATCH net-next v2 5/5] net/sched: flower: Consider the number of tags for vlan filters

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Date:   Tue, 12 Apr 2022 13:09:35 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Boris Sukholitko <boris.sukholitko@...adcom.com>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Eric Dumazet <edumazet@...gle.com>,
        zhang kai <zhangkaiheb@....com>,
        Yoshiki Komachi <komachi.yoshiki@...il.com>,
        Ilya Lifshits <ilya.lifshits@...adcom.com>
Subject: Re: [PATCH net-next v2 5/5] net/sched: flower: Consider the number
 of tags for vlan filters

Tue, Apr 12, 2022 at 12:02:36PM CEST, boris.sukholitko@...adcom.com wrote:
>Currently the existence of vlan filters is conditional on the vlan
>protocol being matched in the tc rule. I.e. the following rule:
>
>tc filter add dev eth1 ingress flower vlan_prio 5
>
>is illegal because we lack protocol 802.1q in the rule.
>
>Having the num_of_vlans filter configured removes this restriction. The
>following rule becomes ok:
>
>tc filter add dev eth1 ingress flower num_of_vlans 1 vlan_prio 5
>
>because we know that the packet is single tagged.
>
>We achieve the above by having is_vlan_key helper look at the number of

Sorry to be a nitpicker, but who's "we"? When I read the patch
description, I need to understand clearly what the patch is doing, which
is not this case. You suppose to command the codebase what to do.
I fail to see that :/


>vlans in addition to the vlan ethertype. Outer tag vlan filters (e.g.
>vlan_prio) require the number of vlan tags be greater than 0. Inner
>filters (e.g. cvlan_prio) require the number of vlan tags be greater
>than 1.
>
>Number of vlans filter may cause ethertype to be set to 0. Check this in
>fl_set_key_vlan.
>