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Miller" , Jakub Kicinski , netdev@vger.kernel.org, UNGLinuxDriver@microchip.com, Alexandre Belloni , Andrew Lunn , Florian Fainelli , Vivien Didelot , Claudiu Manoil Subject: [RFC PATCH net-next 08/16] net: mscc: ocelot: avoid unneeded "lp" variable in LAG join Date: Tue, 8 Dec 2020 14:07:54 +0200 Message-Id: <20201208120802.1268708-9-vladimir.oltean@nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201208120802.1268708-1-vladimir.oltean@nxp.com> References: <20201208120802.1268708-1-vladimir.oltean@nxp.com> X-Originating-IP: [188.25.2.120] X-ClientProxiedBy: AM9P192CA0016.EURP192.PROD.OUTLOOK.COM (2603:10a6:20b:21d::21) To VI1PR04MB5696.eurprd04.prod.outlook.com (2603:10a6:803:e7::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (188.25.2.120) by AM9P192CA0016.EURP192.PROD.OUTLOOK.COM (2603:10a6:20b:21d::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3632.17 via Frontend Transport; Tue, 8 Dec 2020 12:08:29 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 52e4c759-9ddf-4f1e-da06-08d89b71fa63 X-MS-TrafficTypeDiagnostic: VI1PR04MB5693: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6790; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: rAAq5SgVzwz3QQCHpDPTfdk2px7QhwAnMD607t3oDP41zXovwC1VgDM2AqN6pwncW/jgcYglbzha4QONuRFMjshmNzpdc3uwC8LUa7vEqwHIk4JdCfcL4mmrdnTDpwow8yrOvbQ1z6AVGNoh2o4tcUiHjpwQPXEwc5Na9p9gSiIw8kxjbgr5F4ZQo0lKx0ktSi2ij6ZLDhn8oDM6rsIEglkLkFCqqEXHkHH04zhTczNlXdttKx9B6U/pd9flD0qSk//XaFjtImXJdqkFVJk9/Arms2rh4sCyJjjDlsN4u0SE839JOs0RXoKfzr5ws8uWai8kFMDnSW4QECGKPhvGQmQVN7MoM7T8K3eL1Vy0nGIq9iCh2PMPUje8liIFY855 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:VI1PR04MB5696.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(498600001)(5660300002)(956004)(83380400001)(2616005)(69590400008)(4326008)(54906003)(6506007)(6486002)(44832011)(66556008)(2906002)(36756003)(186003)(6512007)(6666004)(6916009)(66946007)(66476007)(26005)(16526019)(86362001)(52116002)(1076003)(8676002)(8936002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 52e4c759-9ddf-4f1e-da06-08d89b71fa63 X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5696.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Dec 2020 12:08:31.0331 (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: sAGZ/doje1oBzu/FU/TuuUSsScdkSfP06gVl5uVfbqmaFJ7S59EoHgnMkfccpyeVp1Xap7caCf3Znc2+5jl8pQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB5693 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The index of the LAG is equal to the logical port ID that all the physical port members have, which is further equal to the index of the first physical port that is a member of the LAG. The code gets a bit carried away with logic like this: if (a == b) c = a; else c = b; which can be simplified, of course, into: c = b; (with a being port, b being lp, c being lag) This further makes the "lp" variable redundant, since we can use "lag" everywhere where "lp" (logical port) was used. So instead of a "c = b" assignment, we can do a complete deletion of b. Only one comment here: if (bond_mask) { lp = __ffs(bond_mask); ocelot->lags[lp] = 0; } lp was clobbered before, because it was used as a temporary variable to hold the new smallest port ID from the bond. Now that we don't have "lp" any longer, we'll just avoid the temporary variable and zeroize the bonding mask directly. Signed-off-by: Vladimir Oltean --- drivers/net/ethernet/mscc/ocelot.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c index 30dee1f957d1..080fd4ce37ea 100644 --- a/drivers/net/ethernet/mscc/ocelot.c +++ b/drivers/net/ethernet/mscc/ocelot.c @@ -1291,28 +1291,24 @@ int ocelot_port_lag_join(struct ocelot *ocelot, int port, struct net_device *bond) { u32 bond_mask = 0; - int lag, lp; + int lag; ocelot->ports[port]->bond = bond; bond_mask = ocelot_get_bond_mask(ocelot, bond); - lp = __ffs(bond_mask); + lag = __ffs(bond_mask); /* If the new port is the lowest one, use it as the logical port from * now on */ - if (port == lp) { - lag = port; + if (port == lag) { ocelot->lags[port] = bond_mask; bond_mask &= ~BIT(port); - if (bond_mask) { - lp = __ffs(bond_mask); - ocelot->lags[lp] = 0; - } + if (bond_mask) + ocelot->lags[__ffs(bond_mask)] = 0; } else { - lag = lp; - ocelot->lags[lp] |= BIT(port); + ocelot->lags[lag] |= BIT(port); } ocelot_setup_lag(ocelot, lag);