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Received: from DBBPR04MB7500.eurprd04.prod.outlook.com (2603:10a6:10:1f4::16) by PAXPR04MB8608.eurprd04.prod.outlook.com (2603:10a6:102:21b::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9870.18; Thu, 30 Apr 2026 02:48:22 +0000 Received: from DBBPR04MB7500.eurprd04.prod.outlook.com ([fe80::c291:543b:4bde:cee7]) by DBBPR04MB7500.eurprd04.prod.outlook.com ([fe80::c291:543b:4bde:cee7%6]) with mapi id 15.20.9870.020; Thu, 30 Apr 2026 02:48:22 +0000 From: Wei Fang To: claudiu.manoil@nxp.com, vladimir.oltean@nxp.com, xiaoning.wang@nxp.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, f.fainelli@gmail.com, frank.li@nxp.com, chleroy@kernel.org, horms@kernel.org, linux@armlinux.org.uk Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev Subject: [PATCH v5 net-next 08/15] net: enetc: add multiple command BD rings support Date: Thu, 30 Apr 2026 10:49:38 +0800 Message-Id: <20260430024945.3413973-9-wei.fang@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260430024945.3413973-1-wei.fang@nxp.com> References: <20260430024945.3413973-1-wei.fang@nxp.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SG2PR01CA0133.apcprd01.prod.exchangelabs.com (2603:1096:4:8f::13) To DBBPR04MB7500.eurprd04.prod.outlook.com (2603:10a6:10:1f4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DBBPR04MB7500:EE_|PAXPR04MB8608:EE_ X-MS-Office365-Filtering-Correlation-Id: 10cf210c-fe98-4e59-7085-08dea662f1da X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|19092799006|7416014|52116014|376014|38350700014|921020|56012099003|22082099003|20052099010|18002099003; 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Currently, the NTMP driver does not support multiple rings. Therefore, update ntmp_select_and_lock_cbdr() to select a appropriate ring to execute the command for the switch. Signed-off-by: Wei Fang --- drivers/net/ethernet/freescale/enetc/ntmp.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/freescale/enetc/ntmp.c b/drivers/net/ethernet/freescale/enetc/ntmp.c index add8e30a6061..4bb7d06e5dfd 100644 --- a/drivers/net/ethernet/freescale/enetc/ntmp.c +++ b/drivers/net/ethernet/freescale/enetc/ntmp.c @@ -144,11 +144,16 @@ static void ntmp_clean_cbdr(struct netc_cbdr *cbdr) static void ntmp_select_and_lock_cbdr(struct ntmp_user *user, struct netc_cbdr **cbdr) { - /* Currently only ENETC is supported, and it has only one command - * BD ring. - */ - *cbdr = &user->ring[0]; + for (int i = 0; i < user->cbdr_num; i++) { + *cbdr = &user->ring[i]; + if (mutex_trylock(&(*cbdr)->ring_lock)) + return; + } + /* If all command BD rings are locked, we need to select one of + * them and wait for it. + */ + *cbdr = &user->ring[raw_smp_processor_id() % user->cbdr_num]; mutex_lock(&(*cbdr)->ring_lock); } -- 2.34.1