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Miller" , Jakub Kicinski , , , CC: Joseph Huang Subject: [PATCH net 0/6] bridge: Fix snooping in multi-bridge config with switchdev Date: Tue, 4 May 2021 14:22:53 -0400 Message-ID: <20210504182259.5042-1-Joseph.Huang@garmin.com> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: OLAWPA-EXMB2.ad.garmin.com (10.5.144.24) To OLAWPA-EXMB4.ad.garmin.com (10.5.144.25) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e5c72fbe-63be-404b-6d8d-08d90f29b41f X-MS-TrafficTypeDiagnostic: MWHPR0401MB3578: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:1775; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:204.77.163.244;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:edgetransport.garmin.com;PTR:extedge.garmin.com;CAT:NONE;SFS:(376002)(346002)(39860400002)(136003)(396003)(46966006)(36840700001)(426003)(86362001)(47076005)(5660300002)(7696005)(2616005)(186003)(8676002)(8936002)(336012)(356005)(26005)(110136005)(7636003)(316002)(2906002)(478600001)(4326008)(82310400003)(107886003)(36756003)(1076003)(36860700001)(70586007)(6666004)(70206006)(83380400001)(82740400003);DIR:OUT;SFP:1102; X-OriginatorOrg: garmin.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 May 2021 18:23:23.8630 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e5c72fbe-63be-404b-6d8d-08d90f29b41f X-MS-Exchange-CrossTenant-Id: 38d0d425-ba52-4c0a-a03e-2a65c8e82e2d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=38d0d425-ba52-4c0a-a03e-2a65c8e82e2d;Ip=[204.77.163.244];Helo=[edgetransport.garmin.com] X-MS-Exchange-CrossTenant-AuthSource: BN7NAM10FT051.eop-nam10.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR0401MB3578 X-Proofpoint-ORIG-GUID: c4QKdp2hXUo1WATe_Zj0BgqvFtd3V4ns X-Proofpoint-GUID: c4QKdp2hXUo1WATe_Zj0BgqvFtd3V4ns X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-05-04_12:2021-05-04,2021-05-04 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 malwarescore=0 suspectscore=0 phishscore=0 mlxlogscore=999 priorityscore=1501 spamscore=0 clxscore=1011 adultscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2105040121 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This series of patches contains the following fixes: 1. In a distributed system with multiple hardware-offloading bridges, if a multicast source is attached to a Non-Querier bridge, the bridge will not forward any multicast packets from that source to the Querier. +--------------------+ | | | Snooping | +------------+ | Bridge 1 |----| Listener 1 | | (Querier) | +------------+ | | +--------------------+ | | +----+---------+-----+ | | mrouter | | +-----------+ | +---------+ | +------------+ | MC Source |----| Snooping |----| Listener 2 | +-----------| | Bridge 2 | +------------+ | (Non-Querier) | +--------------------+ In this scenario, Listener 1 will never receive multicast traffic from MC Source since Snooping Bridge 2 does not forward multicast packets to the mrouter port. Patches 0001, 0002, and 0003 address this issue. 2. If mcast_flood is disabled on a bridge port, some of the snooping functions stop working properly. a. Consider the following scenario: +--------------------+ | | | Snooping | +------------+ | Bridge 1 |----| Listener 1 | | (Querier) | +------------+ | | +--------------------+ | | +--------------------+ | | mrouter | | +-----------+ | +---------+ | | MC Source |----| Snooping | +-----------| | Bridge 2 | | (Non-Querier) | +--------------------+ In this scenario, Listener 1 will never receive multicast traffic from MC Source if mcast_flood is disabled on the mrouter port on Snooping Bridge 2. Patch 0004 addresses this issue. b. For a Non-Querier bridge, if mcast_flood is disabled on a bridge port, Queries received from other Querier will not be forwarded out of that bridge port. Patch 0005 addresses this issue. 3. After a system boots up, the first couple Reports are not handled properly: 1) the Report from the Host is being flooded (via br_flood) to all bridge ports, and 2) if the mrouter port's mcast_flood is disabled, the Reports received from other hosts will not be forwarded to the Querier. Patch 0006 addresses this issue. These patches were developed and verified initially against 5.4 kernel (due to hardware platform limitation) and forward-patched to 5.12. Snooping code introduced between 5.4 and 5.12 are not extensively tested (only IGMPv2/MLDv1 were tested). The hardware platform used were two bridges utilizing a single Marvell 88E6352 Ethernet switch chip (i.e., no cross-chip bridging involved). Joseph Huang (6): bridge: Refactor br_mdb_notify bridge: Offload mrouter port forwarding to switchdev bridge: Avoid traffic disruption when Querier state changes bridge: Force mcast_flooding for mrouter ports bridge: Flood Queries even when mcast_flood is disabled bridge: Always multicast_flood Reports net/bridge/br_device.c | 5 +- net/bridge/br_forward.c | 3 +- net/bridge/br_input.c | 5 +- net/bridge/br_mdb.c | 70 +++++++++++++--------- net/bridge/br_multicast.c | 121 ++++++++++++++++++++++++++++++++++---- net/bridge/br_private.h | 11 +++- 6 files changed, 169 insertions(+), 46 deletions(-) base-commit: 5e321ded302da4d8c5d5dd953423d9b748ab3775 -- 2.17.1