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Miller" , Jakub Kicinski , james.jurack@ametek.com Subject: [PATCH net v2 2/2] gianfar: Account for Tx PTP timestamp in the skb headroom Date: Thu, 29 Oct 2020 10:10:57 +0200 Message-Id: <20201029081057.8506-2-claudiu.manoil@nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201029081057.8506-1-claudiu.manoil@nxp.com> References: <20201029081057.8506-1-claudiu.manoil@nxp.com> Content-Type: text/plain X-Originating-IP: [83.217.231.2] X-ClientProxiedBy: AM9P192CA0012.EURP192.PROD.OUTLOOK.COM (2603:10a6:20b:21d::17) To AM0PR04MB6754.eurprd04.prod.outlook.com (2603:10a6:208:170::28) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from lsv15141.swis.ro-buh01.nxp.com (83.217.231.2) by AM9P192CA0012.EURP192.PROD.OUTLOOK.COM (2603:10a6:20b:21d::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3499.19 via Frontend Transport; Thu, 29 Oct 2020 08:11:10 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 5612ccc7-6712-4930-2217-08d87be23278 X-MS-TrafficTypeDiagnostic: AM0PR0402MB3827: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: qeaxg1HOtE0wZAPZ5LFTpm/HlAH+0hQ95KoVvwLpSYqB/bifMxKVXFpozvXjbK5zxON9ZmWX7aq100NP5wTEWZh7HYp9PVbKjIXaHK4iDL8oHDyy8GmTY1aTbmXhQM6KeTaDv8KekK0azdQxhIRitYzG2+RpZ2Ao6J9gYqInmwLkPiy/u9Lhw/w5gOM5MQzMb2TX1DW9kXWsH4HcXUnXK0DnOlyDxjz7GPz+uGTR27VzoRIp/oHK5NIfwuJjJkqt3YASxGikDWh+0NKubCuT7Gs6cT1J+cEX66KcP/1OJtiqdqVu2jZr36WdxGDshDKaUPwSJ47Y167XIRVgflYN9g== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM0PR04MB6754.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(136003)(366004)(39860400002)(346002)(376002)(396003)(2616005)(8676002)(26005)(956004)(54906003)(86362001)(36756003)(316002)(66556008)(6916009)(66946007)(66476007)(83380400001)(8936002)(186003)(1076003)(5660300002)(6486002)(478600001)(15650500001)(4326008)(16526019)(44832011)(6666004)(2906002)(52116002)(7696005);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5612ccc7-6712-4930-2217-08d87be23278 X-MS-Exchange-CrossTenant-AuthSource: AM0PR04MB6754.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Oct 2020 08:11:11.4703 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: bGDWcvl1RdZ58vauuLvfZAEkUwYMZ6+ji64nI9W5a8iGxnT9I/XUlJkXiJUtHW8Ig8b5nBYinEElHDygyyrXug== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR0402MB3827 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org When PTP timestamping is enabled on Tx, the controller inserts the Tx timestamp at the beginning of the frame buffer, between SFD and the L2 frame header. This means that the skb provided by the stack is required to have enough headroom otherwise it needs to be reallocated. This patch is requesting enough headroom from the stack to accommodate PTP frames in order to avoid reallocation whenever possible. There's no reason not to set needed_headroom to a large enough value to accommodate PTP frames, so in this regard this patch is a fix. Fixes: bee9e58c9e98 ("gianfar:don't add FCB length to hard_header_len") Signed-off-by: Claudiu Manoil --- v2: rephrased message after adding patch 1/2 drivers/net/ethernet/freescale/gianfar.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c index 7b735fe65334..d391a45cebb6 100644 --- a/drivers/net/ethernet/freescale/gianfar.c +++ b/drivers/net/ethernet/freescale/gianfar.c @@ -3372,7 +3372,7 @@ static int gfar_probe(struct platform_device *ofdev) if (dev->features & NETIF_F_IP_CSUM || priv->device_flags & FSL_GIANFAR_DEV_HAS_TIMER) - dev->needed_headroom = GMAC_FCB_LEN; + dev->needed_headroom = GMAC_FCB_LEN + GMAC_TXPAL_LEN; /* Initializing some of the rx/tx queue level parameters */ for (i = 0; i < priv->num_tx_queues; i++) { -- 2.17.1