From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6544EC433F5 for ; Wed, 13 Apr 2022 12:12:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235277AbiDMMOd (ORCPT ); Wed, 13 Apr 2022 08:14:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39372 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232147AbiDMMOa (ORCPT ); Wed, 13 Apr 2022 08:14:30 -0400 Received: from mail-pf1-x436.google.com (mail-pf1-x436.google.com [IPv6:2607:f8b0:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DFF3E5DA0E for ; Wed, 13 Apr 2022 05:12:08 -0700 (PDT) Received: by mail-pf1-x436.google.com with SMTP id w7so1802742pfu.11 for ; Wed, 13 Apr 2022 05:12:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :in-reply-to; bh=ibwBzYwYbBh2t32XZnSkvZXGDv4TDx4u3z/MvzXw+Hk=; b=gkTICXrqp6jNT6Ffdw92tqKSiXyUCWOkA4HV5AdIMJ3rMAACjKjv8DaNiBvJIMCfQm qEwqcZsSA/7Evhr8MQ9y2Bwwmt+ELII3apXrnBp1PbXStAxG1YQ1WTKClaOz3Iq6MHqq 2MbIbFSyDRH9JZaw9iMtfdFOq6o9pfxJ4ISAY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:in-reply-to; bh=ibwBzYwYbBh2t32XZnSkvZXGDv4TDx4u3z/MvzXw+Hk=; b=ktE4srJiNJLG3rsoijgFMZ1XVAIHR+Ei76x1kGaBAiKnyh6b5A9rnGktXn14Bf0KP5 Qc5M0PIJR49/9AwCGEaXJiWokgXeL7Pd5xoPCpSiY3FL/u2uAN8+qzHa9Anl71Sv5xQA wYHIKeTIfHOEc9NB9QRlFRdRguijG8RSz+OM3NzcqBlVywDncBJxER78Feijfr0Kr/qD Z/uOx7HuDBc2Anr2is34Uvwk/qFbpsefeBcaMTu1eceIieWe/mfdOL9qjMwSl7ItDWpI kmjywR+W9JymnO6IHgG4flkkifZ13WhH8oHRGihtamq3j8aWteMQr2wiu6Ge6JIqvpEq i+Mg== X-Gm-Message-State: AOAM5307meuNHaKVrcgX+kexssdzpYgRFcX+uufp93oxpDqlTVlOCb7z cPD+4RCGWKb+KDUCf6XDe+fYAA== X-Google-Smtp-Source: ABdhPJyLlUPrYZD77givFnsGDXMlkvd8w4YCxFfBeC5/0xO4CACj4oMFcbhuBK6CIluK1c01hBadbg== X-Received: by 2002:a63:4d4c:0:b0:39d:3808:804f with SMTP id n12-20020a634d4c000000b0039d3808804fmr15260385pgl.312.1649851928272; Wed, 13 Apr 2022 05:12:08 -0700 (PDT) Received: from noodle ([192.19.250.250]) by smtp.gmail.com with ESMTPSA id v26-20020aa7809a000000b00505bf88a17bsm10755825pff.214.2022.04.13.05.12.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Apr 2022 05:12:06 -0700 (PDT) Date: Wed, 13 Apr 2022 15:11:59 +0300 From: Boris Sukholitko To: Jiri Pirko Cc: netdev@vger.kernel.org, "David S . Miller" , Jakub Kicinski , Jamal Hadi Salim , Cong Wang , "Gustavo A . R . Silva" , Vladimir Oltean , Eric Dumazet , zhang kai , Yoshiki Komachi , Ilya Lifshits Subject: Re: [PATCH net-next v2 5/5] net/sched: flower: Consider the number of tags for vlan filters Message-ID: <20220413121159.GB12128@noodle> References: <20220412100236.27244-1-boris.sukholitko@broadcom.com> <20220412100236.27244-6-boris.sukholitko@broadcom.com> <20220412114049.GA2451@noodle> <20220412131610.GB2451@noodle> <20220413081417.GA12128@noodle> MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000023c9ab05dc881625" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --00000000000023c9ab05dc881625 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Apr 13, 2022 at 01:44:56PM +0200, Jiri Pirko wrote: > Wed, Apr 13, 2022 at 10:14:17AM CEST, boris.sukholitko@broadcom.com wrote: > >On Tue, Apr 12, 2022 at 04:17:01PM +0200, Jiri Pirko wrote: > >> Tue, Apr 12, 2022 at 03:16:10PM CEST, boris.sukholitko@broadcom.com wrote: > >> >On Tue, Apr 12, 2022 at 02:12:15PM +0200, Jiri Pirko wrote: > >> >> Tue, Apr 12, 2022 at 01:40:49PM CEST, boris.sukholitko@broadcom.com wrote: > >> >> >On Tue, Apr 12, 2022 at 01:09:35PM +0200, Jiri Pirko wrote: > >> >> >> Tue, Apr 12, 2022 at 12:02:36PM CEST, boris.sukholitko@broadcom.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 :/ > >> >> >> > >> >> >> > >> >> > > >> >> >What do you think of the following description? The description consists > >> >> >of two parts: the first provides motivation for the patch, the second is > >> >> >the way the motivation is implemented. I've judiciously edited out the > >> >> >"we"-word. :) > >> >> > > >> >> > > >> >> > > >> >> >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 vlan protocol (e.g. 802.1q) does not appear 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 > >> >> > >> >> So this is what this patch allows? > >> > > >> >Yes. > >> > > >> >> You are talking about it as it is > >> >> already possible with the code before this patch being applied. > >> >> > >> > > >> >Sorry for the confusion. In the updated description I try to make the > >> >distinction much clearer. > >> > > >> >> > >> >> > > >> >> >because having num_of_vlans==1 implies that the packet is single tagged. > >> >> > > >> >> >To make the above possible, is_vlan_key helper is changed to look at the > >> >> >number of vlans in addition to the vlan ethertype. > >> >> > >> >> What "is changed"? You should tell the codebase what to do, what toadd, > >> >> remove or change. If you did that, it would be very clear to the reader > >> >> what the patch is supposed to do. > >> >> > >> > > >> >The "changed" refers to the code of is_vlan_key function which is > >> >changed by this patch. Please see the updated description. > >> > > >> >> > >> >> > > >> >> >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. > >> >> > >> >> Again, unclear what this describes, if the current code before the patch > >> >> or the state after this patch. > >> >> > >> > > >> >What about the following: > >> > > >> > > >> > > >> >Before this commit the existence of vlan filters was conditional on the vlan > >> >protocol being matched in the tc rule. For example, the following rule: > >> > > >> >tc filter add dev eth1 ingress flower vlan_prio 5 > >> > > >> >was illegal because vlan protocol (e.g. 802.1q) does not appear in the rule. > >> > > >> >This commit removes the above restriction. Having the num_of_vlans > >> > >> Say rather just "Remove the above restriction. ..." > >> > >> > >> >filter configured allows further matching on vlan attributes. The > >> >following rule is ok now: > >> > > >> >tc filter add dev eth1 ingress flower num_of_vlans 1 vlan_prio 5 > >> > > >> >because having num_of_vlans==1 implies that the packet is single tagged. > >> > > >> >To do this, this commit changes is_vlan_key helper to look at the number > >> > >> "Change the is_vlan_key helper to look..." > >> > >> Don't talk about "this commit". > >> > > > >OK. The following incorporates both of the above suggestions: > > > > > > > >Before this commit the existence of vlan filters was conditional on the vlan > >protocol being matched in the tc rule. For example, the following rule: > > > >tc filter add dev eth1 ingress flower vlan_prio 5 > > > >was illegal because vlan protocol (e.g. 802.1q) does not appear in the rule. > > > >Remove the above restriction by looking at the num_of_vlans filter to > >allow further matching on vlan attributes. The following rule is ok now: > > What's "now"? "Now" is the situation after applying the patch. I'll mention this fact in the description below. > > > > > >tc filter add dev eth1 ingress flower num_of_vlans 1 vlan_prio 5 > > > >because having num_of_vlans==1 implies that the packet is single tagged. > > > >Change is_vlan_key helper to look at the number of vlans in addition to > >the vlan ethertype. Outer (e.g. vlan_prio) and inner (e.g. cvlan_prio) > >tag vlan filters require the number of vlan tags to be greater then 0 > >and 1 accordingly. > > I don't get this last sentence. "filters require". Do you do the change > or are you stating what's in before the patch? > The whole paragraph starting with "Change..." talks about what happens after the patch. I'll make it more explicit in the description below. The updated description follows: Before this commit the existence of vlan filters was conditional on the vlan protocol being matched in the tc rule. For example, the following rule: tc filter add dev eth1 ingress flower vlan_prio 5 was illegal because vlan protocol (e.g. 802.1q) does not appear in the rule. Remove the above restriction by looking at the num_of_vlans filter to allow further matching on vlan attributes. The following rule becomes legal as a result of this commit: tc filter add dev eth1 ingress flower num_of_vlans 1 vlan_prio 5 because having num_of_vlans==1 implies that the packet is single tagged. Change is_vlan_key helper to look at the number of vlans in addition to the vlan ethertype. The outcome of this change is that outer (e.g. vlan_prio) and inner (e.g. cvlan_prio) tag vlan filters require the number of vlan tags to be greater then 0 and 1 accordingly. As a result of is_vlan_key change, the ethertype may be set to 0 when matching on the number of vlans. Update fl_set_key_vlan to avoid setting key, mask vlan_tpid for the 0 ethertype. 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