From patchwork Tue Apr 14 11:26:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Horatiu Vultur X-Patchwork-Id: 221209 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=-8.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING, SPF_HELO_NONE, SPF_PASS, 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 89793C2BBC7 for ; Tue, 14 Apr 2020 11:32:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 699022075E for ; Tue, 14 Apr 2020 11:32:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b="qcoQumLJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2439042AbgDNL1P (ORCPT ); Tue, 14 Apr 2020 07:27:15 -0400 Received: from esa1.microchip.iphmx.com ([68.232.147.91]:18260 "EHLO esa1.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2438988AbgDNL1N (ORCPT ); Tue, 14 Apr 2020 07:27:13 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1586863631; x=1618399631; h=from:to:cc:subject:date:message-id:mime-version; bh=FuYPDzhAp4AkJuDESIBbxHtSPd32PmaudYkGVipmWWU=; b=qcoQumLJD9dEaLzbWbVNmg/NOvze3oDezsgF2ZtXtK/kztxWgxilx0/A CDCHpmxuoJ0+65XVPm/o6e/VED6Hoq7AAB88FGlVBMQEXGavcgu2fwAu3 97Z6BINGlmoqZd1bMDEx3ixLW0TygbsuIPguUra+40lA0ULwdtZYYCdC/ b8XzU1jtlc6AgrTdXb0/ibVru3lP4fqkpBf1EG8LmjDMMn1I5l7CkmIiL EFpKeK3d1STMSEHSq5CaM2esgvl/s3F3AbCecyzzGwTFYdQP8W8FtLSCc GOFfXOMLmuDqzcV5kpeh33hO8rYgf62LEbXG4olntIyVjcCshgtY9ih7F w==; IronPort-SDR: 3Haq7MpF9Bv8ERNY8ht+UQagAkRURtOTUxXpxcfloT2KEMXkGDMREpktYCgkTL4uEeu28kUR7m wYgtGjJ6l1Taaj3sEbJ5BKbJyos3zeJCw1tygj/sUghwYpGNZtk667DqQ9YeMcSMy6Zfz2gw6B oO50x/IDqgcv2OhWSgBYLW2XDTRq0wNlPSNb0KxJoQMJSW/62J20qgyDXtBYwXxCUahAklgZGm lHBHJhsFG23THxDWuhDqYGpu75Ckw/III7SD+UzA50pqU32xN1pB0YTeS9D3p7MwoVHXS8dYPH ThA= X-IronPort-AV: E=Sophos;i="5.72,382,1580799600"; d="scan'208";a="75809053" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa1.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 14 Apr 2020 04:27:10 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Tue, 14 Apr 2020 04:26:57 -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; Tue, 14 Apr 2020 04:27:08 -0700 From: Horatiu Vultur To: , , , , , , , , , , , CC: Horatiu Vultur Subject: [RFC net-next v5 0/9] net: bridge: mrp: Add support for Media Redundancy Protocol(MRP) Date: Tue, 14 Apr 2020 13:26:09 +0200 Message-ID: <20200414112618.3644-1-horatiu.vultur@microchip.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@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][4], 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[5]. 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://www.spinics.net/lists/netdev/msg641005.html [5] https://github.com/microchip-ung/mrp/tree/patch-v5 -v5: - use nla_parse_nested - rework the usage of the rcu in br_mrp - reorder patches - few other small issues raised by Nikolay -v4: - extend existing netlink interface to add mrp support - use rcu locks -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: Update Kconfig and Makefile bridge: mrp: Expose function br_mrp_port_open bridge: mrp: Add MRP interface. 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: Implement netlink interface to configure MRP bridge: mrp: Integrate MRP into the bridge include/linux/if_bridge.h | 1 + include/linux/mrp_bridge.h | 24 ++ include/net/switchdev.h | 62 ++++ include/uapi/linux/if_bridge.h | 43 +++ 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_if.c | 2 + net/bridge/br_input.c | 3 + net/bridge/br_mrp.c | 559 ++++++++++++++++++++++++++++++++ net/bridge/br_mrp_netlink.c | 164 ++++++++++ net/bridge/br_mrp_switchdev.c | 144 ++++++++ net/bridge/br_netlink.c | 5 + net/bridge/br_private.h | 35 ++ net/bridge/br_private_mrp.h | 61 ++++ net/bridge/br_stp.c | 6 + net/bridge/br_stp_if.c | 5 + 19 files changed, 1216 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