From patchwork Thu Sep 8 12:04:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Machon X-Patchwork-Id: 12969985 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 CC0F8C38145 for ; Thu, 8 Sep 2022 11:56:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229936AbiIHL41 (ORCPT ); Thu, 8 Sep 2022 07:56:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229667AbiIHL40 (ORCPT ); Thu, 8 Sep 2022 07:56:26 -0400 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32C0E5F115 for ; Thu, 8 Sep 2022 04:56:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1662638183; x=1694174183; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=u7V1e2Lb8VWXg8uIzCTxcx5SKJt2CSSqJi2kMlEMmJE=; b=q37oPWON7ztS/83fh23xSmTACimRSvVreJgKlT/yk5J9nCHLdX89Dwv9 6XaBBtGGmoBHRax5zSMLVLr60hiEE5CULqAvihsQst/p1DhyO6Iq670Ln /h77qs++HTMXgULawFI3QDtwjWM8G6ksM6JC659j3ijsw3t4aQl/m8oVC 6dDZcUTr2LCHpuGTNBoq6OMXFF3K4lb0UMbk7+4WPRR4CQDKZbTOuEdqI COzJCq3X5cJnItiTcW55rMxGZjATLDbEaqPGBsh2WI9kXwt40BwlRO26f A6TWJuCxOasoFZhiU6AaCcpa1CEwUz+Xh5fgGI+0vN2fDCLPYefBmeg+i Q==; X-IronPort-AV: E=Sophos;i="5.93,300,1654585200"; d="scan'208";a="112728421" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa6.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 08 Sep 2022 04:56:22 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.12; Thu, 8 Sep 2022 04:56:21 -0700 Received: from DEN-LT-70577.microchip.com (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.12 via Frontend Transport; Thu, 8 Sep 2022 04:56:19 -0700 From: Daniel Machon To: CC: , , , , , , , , Daniel Machon Subject: [RFC PATCH net-next 0/2] Add PCP selector and new APPTRUST attribute Date: Thu, 8 Sep 2022 14:04:40 +0200 Message-ID: <20220908120442.3069771-1-daniel.machon@microchip.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC This patch series adds support for offloading PCP-based queue classification and introduces a new APPTRUST extension attribute to the 8021Qaz APP managed object. Prior to implemenation, it has been discussed on the netdev mailing list here: https://lore.kernel.org/netdev/Yv9VO1DYAxNduw6A@DEN-LT-70577/ In summary: there currently exist no conveinent way to offload per-port PCP-based queue classification to hardware. Similarly, there is no way to indicate the notion of trust for APP table selectors. This patch series addresses both topics. PCP based queue classification: 8021Q standardizes the Priority Code Point table (see 6.9.3 of IEEE Std 802.1Q-2018). This patch series makes it possible, to offload the PCP classification to said table. The new PCP selector is not a standard part of the APP managed object, therefore it has been assigned a value of 255 to avoid any clashes with future DCB standard extensions. Selector trust: ASIC's often has the notion of trust DSCP and trust PCP. This new object makes it possible to specify a trust order of app selectors, which drivers can then react on. Patch #1 introduces a new PCP selector to the APP object, which makes it possible to encode PCP and DEI in the app triplet and offload it to the PCP table of the ASIC. Patch #2 Introduces the new extension attribute APPTRUST, which is a list of trusted app selectors. Lower indexes has higher precedence. selectors are stored consecutively, starting from index zero. With a maximum number of 255 unique selectors, the list has the same maximum size. The userspace part of this will be posted in a separate patch series. Daniel Machon (2): net: dcb: add new pcp selector to app object net: dcb: add new apptrust attribute include/net/dcbnl.h | 2 ++ include/uapi/linux/dcbnl.h | 15 +++++++++++++++ net/dcb/dcbnl.c | 17 +++++++++++++++++ 3 files changed, 34 insertions(+) --- 2.34.1