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Thu, 4 Feb 2021 16:50:41 +0000 From: Camelia Groza To: kuba@kernel.org, davem@davemloft.net, maciej.fijalkowski@intel.com Cc: madalin.bucur@oss.nxp.com, netdev@vger.kernel.org, Camelia Groza Subject: [PATCH net v2 2/3] dpaa_eth: reduce data alignment requirements for the A050385 erratum Date: Thu, 4 Feb 2021 18:49:27 +0200 Message-Id: <07da2fe94891ddaeed1140544a7c6ffa156a6711.1612456902.git.camelia.groza@nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: X-Originating-IP: [83.217.231.2] X-ClientProxiedBy: FR2P281CA0026.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:14::13) To VI1PR04MB5807.eurprd04.prod.outlook.com (2603:10a6:803:ec::21) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from lsv15136.swis.ro-buh01.nxp.com (83.217.231.2) by FR2P281CA0026.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:14::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3846.10 via Frontend Transport; Thu, 4 Feb 2021 16:50:40 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 511bc067-c0d0-408f-1573-08d8c92d01af X-MS-TrafficTypeDiagnostic: VI1PR0402MB3454: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5797; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 511bc067-c0d0-408f-1573-08d8c92d01af X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5807.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Feb 2021 16:50:41.5206 (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: EYVDJrvlLAV+ZYmuXUhOjEp0T3llfLz6ZgnFTTMSDSNgalbcdrQgRqNG0tQXibXWAh9d9jLnYTsMN4WaGeorEQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0402MB3454 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org The 256 byte data alignment is required for preventing DMA transaction splits when crossing 4K page boundaries. Since XDP deals only with page sized buffers or less, this restriction isn't needed. Instead, the data only needs to be aligned to 64 bytes to prevent DMA transaction splits. These lessened restrictions can increase performance by widening the pool of permitted data alignments and preventing unnecessary realignments. Fixes: ae680bcbd06a ("dpaa_eth: implement the A050385 erratum workaround for XDP") Signed-off-by: Camelia Groza Acked-by: Maciej Fijalkowski --- drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c index f3a879937d8d..2a2c7db23407 100644 --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c @@ -2192,7 +2192,7 @@ static int dpaa_a050385_wa_xdpf(struct dpaa_priv *priv, * byte frame headroom. If the XDP program uses all of it, copy the * data to a new buffer and make room for storing the backpointer. */ - if (PTR_IS_ALIGNED(xdpf->data, DPAA_A050385_ALIGN) && + if (PTR_IS_ALIGNED(xdpf->data, DPAA_FD_DATA_ALIGNMENT) && xdpf->headroom >= priv->tx_headroom) { xdpf->headroom = priv->tx_headroom; return 0;