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 X-Spam-Level: X-Spam-Status: No, score=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2DFDC4727F for ; Thu, 1 Oct 2020 14:01:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9942F21707 for ; Thu, 1 Oct 2020 14:01:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732670AbgJAOBd (ORCPT ); Thu, 1 Oct 2020 10:01:33 -0400 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:36683 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1732471AbgJAOAa (ORCPT ); Thu, 1 Oct 2020 10:00:30 -0400 Received: from Internal Mail-Server by MTLPINE1 (envelope-from moshe@mellanox.com) with SMTP; 1 Oct 2020 17:00:27 +0300 Received: from dev-l-vrt-136.mtl.labs.mlnx (dev-l-vrt-136.mtl.labs.mlnx [10.234.136.1]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 091E0RxA002378; Thu, 1 Oct 2020 17:00:27 +0300 Received: from dev-l-vrt-136.mtl.labs.mlnx (localhost [127.0.0.1]) by dev-l-vrt-136.mtl.labs.mlnx (8.14.7/8.14.7) with ESMTP id 091E0QHB011192; Thu, 1 Oct 2020 17:00:26 +0300 Received: (from moshe@localhost) by dev-l-vrt-136.mtl.labs.mlnx (8.14.7/8.14.7/Submit) id 091E0QPk011191; Thu, 1 Oct 2020 17:00:26 +0300 From: Moshe Shemesh To: "David S. Miller" , Jakub Kicinski , Jiri Pirko Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Moshe Shemesh Subject: [PATCH net-next 16/16] devlink: Add Documentation/networking/devlink/devlink-reload.rst Date: Thu, 1 Oct 2020 16:59:19 +0300 Message-Id: <1601560759-11030-17-git-send-email-moshe@mellanox.com> X-Mailer: git-send-email 1.8.4.3 In-Reply-To: <1601560759-11030-1-git-send-email-moshe@mellanox.com> References: <1601560759-11030-1-git-send-email-moshe@mellanox.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add devlink reload rst documentation file. Update index file to include it. Signed-off-by: Moshe Shemesh --- RFCv5 -> v1: - Rename reload_action_limit_level to reload_limit RFCv4 -> RFCv5: - Rephrase namespace chnage section - Rephrase note on actions performed RFCv3 -> RFCv4: - Remove reload action fw_activate_no_reset - Add reload actions limit levels and document the no_reset limit level constrains RFCv2 -> RFCv3: - Devlink reload returns the actions done - Replace fw_live_patch action by fw_activate_no_reset - Explain fw_activate meaning RFCv1 -> RFCv2: - Instead of reload levels driver,fw_reset,fw_live_patch have reload actions driver_reinit,fw_activate,fw_live_patch --- .../networking/devlink/devlink-reload.rst | 81 +++++++++++++++++++ Documentation/networking/devlink/index.rst | 1 + 2 files changed, 82 insertions(+) create mode 100644 Documentation/networking/devlink/devlink-reload.rst diff --git a/Documentation/networking/devlink/devlink-reload.rst b/Documentation/networking/devlink/devlink-reload.rst new file mode 100644 index 000000000000..5abc5c2c75fd --- /dev/null +++ b/Documentation/networking/devlink/devlink-reload.rst @@ -0,0 +1,81 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============== +Devlink Reload +============== + +``devlink-reload`` provides mechanism to either reinit driver entities, +applying ``devlink-params`` and ``devlink-resources`` new values or firmware +activation depends on reload action selected. + +Reload actions +============== + +User may select a reload action. +By default ``driver_reinit`` action is selected. + +.. list-table:: Possible reload actions + :widths: 5 90 + + * - Name + - Description + * - ``driver-reinit`` + - Devlink driver entities re-initialization, including applying + new values to devlink entities which are used during driver + load such as ``devlink-params`` in configuration mode + ``driverinit`` or ``devlink-resources`` + * - ``fw_activate`` + - Firmware activate. Activates new firmware if such image is stored and + pending activation. If no limitation specified this action may involve + firmware reset. If no new image pending this action will reload current + firmware image. + +Note that even though user asks for a specific action, the driver +implementation might require to perform another action alongside with +it. For example, some driver do not support driver reinitialization +being performed without fw activation. Therefore, the devlink reload +command returns the list of actions which were actrually performed. + +Reload limits +============= + +By default reload actions are not limited and driver implementation may +include reset or downtime as needed to perform the actions. + +However, some drivers support action limits, which limit the action +implementation to specific constrains. + +.. list-table:: Possible reload limits + :widths: 5 90 + + * - Name + - Description + * - ``no_reset`` + - No reset allowed, no down time allowed, no link flap and no + configuration is lost. + +Change namespace +================ + +The netns option allow user to be able to move devlink instances into +namespaces during devlink reload operation. +By default all devlink instances are created in init_net and stay there. + +example usage +------------- + +.. code:: shell + + $ devlink dev reload help + $ devlink dev reload DEV [ netns { PID | NAME | ID } ] [ action { driver_reinit | fw_activate } ] [ limit no_reset ] + + # Run reload command for devlink driver entities re-initialization: + $ devlink dev reload pci/0000:82:00.0 action driver_reinit + reload_actions_performed: + driver_reinit + + # Run reload command to activate firmware: + # Note that mlx5 driver reloads the driver while activating firmware + $ devlink dev reload pci/0000:82:00.0 action fw_activate + reload_actions_performed: + driver_reinit fw_activate diff --git a/Documentation/networking/devlink/index.rst b/Documentation/networking/devlink/index.rst index 7684ae5c4a4a..d82874760ae2 100644 --- a/Documentation/networking/devlink/index.rst +++ b/Documentation/networking/devlink/index.rst @@ -20,6 +20,7 @@ general. devlink-params devlink-region devlink-resource + devlink-reload devlink-trap Driver-specific documentation -- 2.18.2