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Miller" , Rasmus Villemoes Subject: [PATCH net 1/2] net: mrp: fix definitions of MRP test packets Date: Wed, 23 Dec 2020 15:45:32 +0100 Message-Id: <20201223144533.4145-2-rasmus.villemoes@prevas.dk> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20201223144533.4145-1-rasmus.villemoes@prevas.dk> References: <20201223144533.4145-1-rasmus.villemoes@prevas.dk> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [5.186.115.188] X-ClientProxiedBy: AS8PR04CA0142.eurprd04.prod.outlook.com (2603:10a6:20b:127::27) To AM0PR10MB1874.EURPRD10.PROD.OUTLOOK.COM (2603:10a6:208:3f::10) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from prevas-ravi.prevas.se (5.186.115.188) by AS8PR04CA0142.eurprd04.prod.outlook.com (2603:10a6:20b:127::27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3700.27 via Frontend Transport; Wed, 23 Dec 2020 14:45:43 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 385178f8-f60d-4934-007c-08d8a7516d6e X-MS-TrafficTypeDiagnostic: AM0PR10MB3057: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: Uxx4LpjiWiLsmBTCFv6Kw6qnCX9RvD53UFIYNbO9wL3mh6bAaOhMtYKmiangYuo9eW52QQKN5tWu2kxr+CjFveBHZDKd6egLU61n0sXaDqrdVCaWl+J0EBVeGzzqo8k/atE4W2MQkQp92bn3S/nklBsknVDrK5SeKCGttOE26EQP0qPpGfd3Rv1rp5rJxbAXsRiV69az3fZ6mB1s0NVthTaSdmoOp55rSyAr3VdMdAYCFBK08j4i/lHRZK5zDzAUcIDD5dNdB6oYr4IowOfQXyyFqxWOmoWfi90AtdlvwDs2KcJvlvKAua1odFmydmNvCQsU2gii5mKVKhFejxiGjcSqPo1XMTsQdBX+l54J4dk6xdFci9KCEwgB8AtuTr3nOvABnn2p18nK496SDoYmFw== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM0PR10MB1874.EURPRD10.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(366004)(396003)(136003)(39840400004)(376002)(346002)(54906003)(4326008)(6512007)(6486002)(107886003)(316002)(16526019)(5660300002)(26005)(66476007)(8676002)(66556008)(6506007)(83380400001)(66946007)(186003)(52116002)(2616005)(6916009)(6666004)(44832011)(1076003)(86362001)(8976002)(36756003)(2906002)(8936002)(956004)(478600001);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?u6QzcvLGCsdzHKKu2Z1sK81tGQm6dCiKv8sdAIGnoVn2YMzUNte47JUhwGQo?= =?us-ascii?Q?OHEbz0u3vrpTWudNSVtwJ7xKUL9iO6rRLGnC/aBBLYGDfMjKS2m1KVvKlze+?= =?us-ascii?Q?8YZTu5n8lJHpqC4qbgLBQSkLb7UMiF2CHpnJiwgBc4fIuxzojMwduSQF/IVt?= =?us-ascii?Q?41s7JGzttuA/qeob1YQKL1qzD0MsiMIqnbmYjhHZPAHchHVXxJUeWO859r46?= =?us-ascii?Q?AV1RJmA9vu3grAHtUmNd4itRShUyBm0yZhSuTUQhoyUSLtTyWreDHEHOXCVn?= =?us-ascii?Q?wJQOSXGUmoLhdC3SkgrlpQqzIQ4CHyCgrFhtwLBxdA7lTzMve8rYMnGs84GX?= =?us-ascii?Q?adKAv/EELIz1jNDA6YpqfdYyVDa5JuNRoPjObHniez6On2jfH1yk/IScmH0C?= =?us-ascii?Q?uLhMAmGRJG5SicAfORSs3MDza0Mq2IjmY33yd5bexDzUQWncyMroDsQnqN+l?= =?us-ascii?Q?jsvqknxteyVYS6zoMhragm7r3F0nmn7598L+F0cxXbLTSg+rxMcvOrci7cFC?= =?us-ascii?Q?TCQxmXuL7mh5oeA8Khz9zcRUI+E6rT/HRPBDMr19lzwpVSytX/ew7jecYqGz?= =?us-ascii?Q?yPnT4kY6MUynEKrkk7sYXGV6YX/A5ZzbyyhuoYTwC7kzlfvq9w2pv9vrjRkz?= =?us-ascii?Q?QMmaZ0rM1cJ/O15MA9uwT6WId+TWqMzpcLyfDQ7q7rY5pOWUDNIGhcaTG3vr?= =?us-ascii?Q?tXUB7q5CzFSpllltKj4Xpi6/XXayuQ5m/c/kuMQ0a36L4WwYwVBiKYmM0RXI?= =?us-ascii?Q?RbWhf/ezaLZAGQy/dPwgflD40U+KUccdL+thtW9HfH0p879jnatLzUCE1V3G?= =?us-ascii?Q?kVB1N1KRTSboex/IWP7MeqX26KLk343GlqKy36jAMm6vB0OFLGUvCWybiSI6?= =?us-ascii?Q?42NFZpxLuk//XCj9gGWyAOmgVUDpaAW7UFLdVWzyoTnyW2sRMVmP1jB8cO5b?= =?us-ascii?Q?/uJMxACgt8b62jk3h88CGJwP6JjiVuS9Xg2ByarhWM54RZzNDT9SRtxiUzXI?= =?us-ascii?Q?zyUx?= X-OriginatorOrg: prevas.dk X-MS-Exchange-CrossTenant-AuthSource: AM0PR10MB1874.EURPRD10.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Dec 2020 14:45:44.0022 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: d350cf71-778d-4780-88f5-071a4cb1ed61 X-MS-Exchange-CrossTenant-Network-Message-Id: 385178f8-f60d-4934-007c-08d8a7516d6e X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: k+Pld56rplTeqpYkQ0d28M7qwJb5QJx5bTwmahBkpdUc9LHTxa3J5H4ZM3yPoABlg22fCgcRolJRypy06qAkssuwDENoHFHG7wlwx7KGp48= X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR10MB3057 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Wireshark says that the MRP test packets cannot be decoded - and the reason for that is that there's a two-byte hole filled with garbage between the "transitions" and "timestamp" members. So Wireshark decodes the two garbage bytes and the top two bytes of the timestamp written by the kernel as the timestamp value (which thus fluctuates wildly), and interprets the lower two bytes of the timestamp as a new (type, length) pair, which is of course broken. While my copy of the MRP standard is still under way [*], I cannot imagine the standard specifying a two-byte hole here, and whoever wrote the Wireshark decoding code seems to agree with that. The struct definitions live under include/uapi/, but they are not really part of any kernel<->userspace API/ABI, so fixing the definitions by adding the packed attribute should not cause any compatibility issues. The remaining on-the-wire packet formats likely also don't contain holes, but pahole and manual inspection says the current definitions suffice. So adding the packed attribute to those is not strictly needed, but might be done for good measure. [*] I will never understand how something hidden behind a +1000$ paywall can be called a standard. Signed-off-by: Rasmus Villemoes --- include/uapi/linux/mrp_bridge.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/mrp_bridge.h b/include/uapi/linux/mrp_bridge.h index 6aeb13ef0b1e..d1d0cf65916d 100644 --- a/include/uapi/linux/mrp_bridge.h +++ b/include/uapi/linux/mrp_bridge.h @@ -96,7 +96,7 @@ struct br_mrp_ring_test_hdr { __be16 state; __be16 transitions; __be32 timestamp; -}; +} __attribute__((__packed__)); struct br_mrp_ring_topo_hdr { __be16 prio; @@ -141,7 +141,7 @@ struct br_mrp_in_test_hdr { __be16 state; __be16 transitions; __be32 timestamp; -}; +} __attribute__((__packed__)); struct br_mrp_in_topo_hdr { __u8 sa[ETH_ALEN]; -- 2.23.0