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=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 C8380C43331 for ; Fri, 27 Mar 2020 09:22:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9A17920717 for ; Fri, 27 Mar 2020 09:22:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726661AbgC0JWT (ORCPT ); Fri, 27 Mar 2020 05:22:19 -0400 Received: from esa1.microchip.iphmx.com ([68.232.147.91]:12817 "EHLO esa1.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725946AbgC0JWT (ORCPT ); Fri, 27 Mar 2020 05:22:19 -0400 IronPort-SDR: e2ZmeRMDbZsA90/bG03CZ2fiOLxCd6/0Is+WTM6N2Evf468u8fOlXTNXjKOORpS1ykA75afUYA yUPpIjqYEFPnWV+SU6RnRERi6tmfeai2YLT75/dPCtd34QFrNH5pPonw/baM8Osu72i/TTAFZI XKEchyh+GFLFfFv2HBMAtS5chmr4YxLC9DFx8/xtAZxVDlg58gnnZKxDLpdr7Onie2+9Rsgo+T E4/WX3IUE8tS5mRhGK/CcN+pth6vHLMR2p/6YwAEGY+sCW4TeDxSbytybvsCyercgEXhqd1ezv r6k= X-IronPort-AV: E=Sophos;i="5.72,311,1580799600"; d="scan'208";a="73728093" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa1.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 27 Mar 2020 02:22:18 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Fri, 27 Mar 2020 02:22:18 -0700 Received: from soft-dev3.microsemi.net (10.10.115.15) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.1713.5 via Frontend Transport; Fri, 27 Mar 2020 02:22:15 -0700 From: Horatiu Vultur To: , , , , , , , , , , , CC: Horatiu Vultur Subject: [RFC net-next v4 0/9] net: bridge: mrp: Add support for Media Redundancy Protocol(MRP) Date: Fri, 27 Mar 2020 10:21:17 +0100 Message-ID: <20200327092126.15407-1-horatiu.vultur@microchip.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Media Redundancy Protocol is a data network protocol standardized by International Electrotechnical Commission as IEC 62439-2. It allows rings of Ethernet switches to overcome any single failure with recovery time faster than STP. It is primarily used in Industrial Ethernet applications. Based on the previous RFC[1][2][3], the MRP state machine and all the timers were moved to userspace, except for the timers used to generate MRP Test frames. In this way the userspace doesn't know and should not know if the HW or the kernel will generate the MRP Test frames. The following changes were added to the bridge to support the MRP: - the existing netlink interface was extended with MRP support, - allow to detect when a MRP frame was received on a MRP ring port - allow MRP instance to forward/terminate MRP frames - generate MRP Test frames in case the HW doesn't have support for this To be able to offload MRP support to HW, the switchdev API was extend. With these changes the userspace doesn't do the following because already the kernel/HW will do: - doesn't need to forward/terminate MRP frames - doesn't need to generate MRP Test frames - doesn't need to detect when the ring is open/closed. The userspace application that is using the new netlink can be found here[4]. The current implementation both in kernel and userspace supports only 2 roles: MRM - this one is responsible to send MRP_Test and MRP_Topo frames on both ring ports. It needs to process MRP_Test to know if the ring is open or closed. This operation is desired to be offloaded to the HW because it requires to generate and process up to 4000 frames per second. Whenever it detects that the ring is open it sends MRP_Topo frames to notify all MRC about changes in the topology. MRM needs also to process MRP_LinkChange frames, these frames are generated by the MRC. When the ring is open then the state of both ports is to forward frames and when the ring is closed then the secondary port is blocked. MRC - this one is responsible to forward MRP frames between the ring ports. In case one of the ring ports gets a link down or up, then MRC will generate a MRP_LinkChange frames. This node should also process MRP_Topo frames and to clear its FDB when it receives this frame. Userspace Deamon +----------+ Client + | +--------------|-----------------------------------------+ Kernel | + Netlink | + Interrupt | | +--------------|------------------------------|----------+ HW | Switchdev | + | The user interacts using the client (called 'mrp'), the client talks to the deamon (called 'mrp_server'), which talks with the kernel using netlink. The kernel will try to offload the requests to the HW via switchdev API. If this will be accepted then in the future the netlink interface can be expended with multiple attributes which are required by different roles of the MRP. Like Media Redundancy Automanager(MRA), Media Interconnect Manager(MIM) and Media Interconnect Client(MIC). [1] https://www.spinics.net/lists/netdev/msg623647.html [2] https://www.spinics.net/lists/netdev/msg624378.html [3] https://www.spinics.net/lists/netdev/msg627500.html [4] https://github.com/microchip-ung/mrp/tree/patch-v4 -v3: - move MRP state machine in userspace - create generic netlink interface for configuring the HW using switchdev API -v2: - extend switchdev API to offload to HW Horatiu Vultur (9): bridge: uapi: mrp: Add mrp attributes. bridge: mrp: Expose function br_mrp_port_open bridge: mrp: Add MRP interface. bridge: mrp: Implement netlink interface to configure MRP switchdev: mrp: Extend switchdev API to offload MRP bridge: switchdev: mrp Implement MRP API for switchdev bridge: mrp: Connect MRP api with the switchev API bridge: mrp: Integrate MRP into the bridge bridge: mrp: Update Kconfig and Makefile include/linux/if_bridge.h | 1 + include/linux/mrp_bridge.h | 24 ++ include/net/switchdev.h | 53 ++++ include/uapi/linux/if_bridge.h | 42 +++ include/uapi/linux/if_ether.h | 1 + include/uapi/linux/mrp_bridge.h | 84 ++++++ net/bridge/Kconfig | 12 + net/bridge/Makefile | 2 + net/bridge/br_device.c | 3 + net/bridge/br_input.c | 3 + net/bridge/br_mrp.c | 514 ++++++++++++++++++++++++++++++++ net/bridge/br_mrp_netlink.c | 176 +++++++++++ net/bridge/br_mrp_switchdev.c | 150 ++++++++++ net/bridge/br_netlink.c | 5 + net/bridge/br_private.h | 22 ++ net/bridge/br_private_mrp.h | 67 +++++ net/bridge/br_stp.c | 6 + 17 files changed, 1165 insertions(+) create mode 100644 include/linux/mrp_bridge.h create mode 100644 include/uapi/linux/mrp_bridge.h create mode 100644 net/bridge/br_mrp.c create mode 100644 net/bridge/br_mrp_netlink.c create mode 100644 net/bridge/br_mrp_switchdev.c create mode 100644 net/bridge/br_private_mrp.h -- 2.17.1