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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend Cc: Shenwei Wang , Clark Wang , Stanislav Fomichev , imx@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-imx@nxp.com Subject: [PATCH v4 net-next 5/5] net: fec: enable the Jumbo frame support for i.MX8QM Date: Sun, 31 Aug 2025 16:15:57 -0500 Message-ID: <20250831211557.190141-6-shenwei.wang@nxp.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250831211557.190141-1-shenwei.wang@nxp.com> References: <20250831211557.190141-1-shenwei.wang@nxp.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BYAPR07CA0060.namprd07.prod.outlook.com (2603:10b6:a03:60::37) To PAXPR04MB9185.eurprd04.prod.outlook.com (2603:10a6:102:231::11) Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR04MB9185:EE_|DB9PR04MB8250:EE_ X-MS-Office365-Filtering-Correlation-Id: 5ca10d04-50b5-4d41-ddfb-08dde8d3b239 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|7416014|19092799006|52116014|1800799024|921020|38350700014; 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When Jumbo frames are supported, the TX FIFO may not be large enough to hold an entire frame. To handle this, the FIFO is configured to operate in cut-through mode when the frame size exceeds (PKT_MAXBUF_SIZE - ETH_HLEN - ETH_FCS_LEN), which allows transmission to begin once the FIFO reaches a certain threshold. Signed-off-by: Shenwei Wang --- drivers/net/ethernet/freescale/fec.h | 3 +++ drivers/net/ethernet/freescale/fec_main.c | 25 +++++++++++++++++++---- 2 files changed, 24 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h index f1032a11aa76..6802773c5f34 100644 --- a/drivers/net/ethernet/freescale/fec.h +++ b/drivers/net/ethernet/freescale/fec.h @@ -513,6 +513,9 @@ struct bufdesc_ex { */ #define FEC_QUIRK_HAS_MDIO_C45 BIT(24) +/* Jumbo Frame support */ +#define FEC_QUIRK_JUMBO_FRAME BIT(25) + struct bufdesc_prop { int qid; /* Address of Rx and Tx buffers */ diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 43f342dd9099..9d4adc8335fe 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -167,7 +167,8 @@ static const struct fec_devinfo fec_imx8qm_info = { FEC_QUIRK_ERR007885 | FEC_QUIRK_BUG_CAPTURE | FEC_QUIRK_HAS_RACC | FEC_QUIRK_HAS_COALESCE | FEC_QUIRK_CLEAR_SETUP_MII | FEC_QUIRK_HAS_MULTI_QUEUES | - FEC_QUIRK_DELAYED_CLKS_SUPPORT | FEC_QUIRK_HAS_MDIO_C45, + FEC_QUIRK_DELAYED_CLKS_SUPPORT | FEC_QUIRK_HAS_MDIO_C45 | + FEC_QUIRK_JUMBO_FRAME, }; static const struct fec_devinfo fec_s32v234_info = { @@ -236,6 +237,7 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address"); #define FEC_DRV_RESERVE_SPACE \ (XDP_PACKET_HEADROOM + \ SKB_DATA_ALIGN((unsigned int)sizeof(struct skb_shared_info))) +#define MAX_JUMBO_BUF_SIZE (round_down(16384 - FEC_DRV_RESERVE_SPACE - 64, 64)) #define PKT_MAXBUF_SIZE (round_down(2048 - 64, 64)) #define PKT_MINBUF_SIZE 64 @@ -1281,8 +1283,18 @@ fec_restart(struct net_device *ndev) if (fep->quirks & FEC_QUIRK_ENET_MAC) { /* enable ENET endian swap */ ecntl |= FEC_ECR_BYTESWP; - /* enable ENET store and forward mode */ - writel(FEC_TXWMRK_STRFWD, fep->hwp + FEC_X_WMRK); + + /* When Jumbo Frame is enabled, the FIFO may not be large enough + * to hold an entire frame. In such cases, if the MTU exceeds + * (PKT_MAXBUF_SIZE - ETH_HLEN - ETH_FCS_LEN), configure the interface + * to operate in cut-through mode, triggered by the FIFO threshold. + * Otherwise, enable the ENET store-and-forward mode. + */ + if ((fep->quirks & FEC_QUIRK_JUMBO_FRAME) && + (ndev->mtu > (PKT_MAXBUF_SIZE - ETH_HLEN - ETH_FCS_LEN))) + writel(0xF, fep->hwp + FEC_X_WMRK); + else + writel(FEC_TXWMRK_STRFWD, fep->hwp + FEC_X_WMRK); } if (fep->bufdesc_ex) @@ -4615,7 +4627,12 @@ fec_probe(struct platform_device *pdev) fep->pagepool_order = 0; fep->rx_frame_size = FEC_ENET_RX_FRSIZE; - fep->max_buf_size = PKT_MAXBUF_SIZE; + + if (fep->quirks & FEC_QUIRK_JUMBO_FRAME) + fep->max_buf_size = MAX_JUMBO_BUF_SIZE; + else + fep->max_buf_size = PKT_MAXBUF_SIZE; + ndev->max_mtu = fep->max_buf_size - ETH_HLEN - ETH_FCS_LEN; ret = register_netdev(ndev); -- 2.43.0