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Fri, 15 May 2026 12:24:02 -0700 From: David Thompson To: , , , , , , CC: , , David Thompson Subject: [PATCH net] net: lan743x: permit VLAN-tagged packets up to configured MTU Date: Fri, 15 May 2026 19:23:57 +0000 Message-ID: <20260515192357.3631802-1-davthompson@nvidia.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY1PEPF0001AE1D:EE_|PH0PR12MB7093:EE_ X-MS-Office365-Filtering-Correlation-Id: 40a807aa-222c-4c58-c04c-08deb2b78c01 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|82310400026|376014|11063799003|18002099003|56012099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700016)(82310400026)(376014)(11063799003)(18002099003)(56012099003);DIR:OUT;SFP:1101; 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In these scenarios, "ethtool -S" reports non-zero "RX Oversize Frame Errors". According to Microchip AN2948, the MAC_RX FSE (VLAN field size enforcement) bit determines whether frames with VLAN tags exceeding the base MTU plus tag length are discarded. The driver must set the MAC_RX.FSE bit before setting MAC_RX.RXEN to allow VLAN-tagged frames up to the interface MTU, preventing them from being treated as oversized. As a result, both the base and VLAN-tagged interfaces can use the same MTU without receive errors. Fixes: 23f0703c125b ("lan743x: Add main source files for new lan743x driver") Signed-off-by: David Thompson --- drivers/net/ethernet/microchip/lan743x_main.c | 2 ++ drivers/net/ethernet/microchip/lan743x_main.h | 1 + 2 files changed, 3 insertions(+) diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c index f3332417162e..6c840f8dd9c3 100644 --- a/drivers/net/ethernet/microchip/lan743x_main.c +++ b/drivers/net/ethernet/microchip/lan743x_main.c @@ -1266,6 +1266,8 @@ static int lan743x_mac_open(struct lan743x_adapter *adapter) u32 temp; temp = lan743x_csr_read(adapter, MAC_RX); + temp |= MAC_RX_FSE_; + lan743x_csr_write(adapter, MAC_RX, temp); lan743x_csr_write(adapter, MAC_RX, temp | MAC_RX_RXEN_); temp = lan743x_csr_read(adapter, MAC_TX); lan743x_csr_write(adapter, MAC_TX, temp | MAC_TX_TXEN_); diff --git a/drivers/net/ethernet/microchip/lan743x_main.h b/drivers/net/ethernet/microchip/lan743x_main.h index 160d94a7cee6..1573c8f9c993 100644 --- a/drivers/net/ethernet/microchip/lan743x_main.h +++ b/drivers/net/ethernet/microchip/lan743x_main.h @@ -182,6 +182,7 @@ #define MAC_RX (0x104) #define MAC_RX_MAX_SIZE_SHIFT_ (16) #define MAC_RX_MAX_SIZE_MASK_ (0x3FFF0000) +#define MAC_RX_FSE_ BIT(2) #define MAC_RX_RXD_ BIT(1) #define MAC_RX_RXEN_ BIT(0) -- 2.43.0