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charset="utf-8" Refactor code to support Jumbo frame functionality by adding a member variable in the fec_enet_private structure to store PKT_MAXBUF_SIZE. Cc: Andrew Lunn Signed-off-by: Shenwei Wang --- drivers/net/ethernet/freescale/fec.h | 1 + drivers/net/ethernet/freescale/fec_main.c | 12 ++++++++---- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/fr= eescale/fec.h index 5c8fdcef759b..2969088dda09 100644 --- a/drivers/net/ethernet/freescale/fec.h +++ b/drivers/net/ethernet/freescale/fec.h @@ -619,6 +619,7 @@ struct fec_enet_private { =20 unsigned int total_tx_ring_size; unsigned int total_rx_ring_size; + unsigned int max_buf_size; =20 struct platform_device *pdev; =20 diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethern= et/freescale/fec_main.c index 1383918f8a3f..24ce808b0c05 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -1083,7 +1083,7 @@ static void fec_enet_enable_ring(struct net_device *n= dev) for (i =3D 0; i < fep->num_rx_queues; i++) { rxq =3D fep->rx_queue[i]; writel(rxq->bd.dma, fep->hwp + FEC_R_DES_START(i)); - writel(PKT_MAXBUF_SIZE, fep->hwp + FEC_R_BUFF_SIZE(i)); + writel(fep->max_buf_size, fep->hwp + FEC_R_BUFF_SIZE(i)); =20 /* enable DMA1/2 */ if (i) @@ -1145,9 +1145,12 @@ static void fec_restart(struct net_device *ndev) { struct fec_enet_private *fep =3D netdev_priv(ndev); - u32 rcntl =3D OPT_FRAME_SIZE | FEC_RCR_MII; + u32 rcntl =3D FEC_RCR_MII; u32 ecntl =3D FEC_ECR_ETHEREN; =20 + if (fep->max_buf_size =3D=3D OPT_FRAME_SIZE) + rcntl |=3D (fep->max_buf_size << 16); + if (fep->bufdesc_ex) fec_ptp_save_state(fep); =20 @@ -1191,7 +1194,7 @@ fec_restart(struct net_device *ndev) else val &=3D ~FEC_RACC_OPTIONS; writel(val, fep->hwp + FEC_RACC); - writel(PKT_MAXBUF_SIZE, fep->hwp + FEC_FTRL); + writel(fep->max_buf_size, fep->hwp + FEC_FTRL); } #endif =20 @@ -4559,7 +4562,8 @@ fec_probe(struct platform_device *pdev) fec_enet_clk_enable(ndev, false); pinctrl_pm_select_sleep_state(&pdev->dev); =20 - ndev->max_mtu =3D PKT_MAXBUF_SIZE - ETH_HLEN - ETH_FCS_LEN; + fep->max_buf_size =3D PKT_MAXBUF_SIZE; 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charset="utf-8" Add a new pagepool_order member in the fec_enet_private struct to allow dynamic configuration of page size for an instance. This change clears the hardcoded page size assumptions. Signed-off-by: Shenwei Wang --- drivers/net/ethernet/freescale/fec.h | 1 + drivers/net/ethernet/freescale/fec_main.c | 5 +++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/fr= eescale/fec.h index 2969088dda09..47317346b2f3 100644 --- a/drivers/net/ethernet/freescale/fec.h +++ b/drivers/net/ethernet/freescale/fec.h @@ -620,6 +620,7 @@ struct fec_enet_private { unsigned int total_tx_ring_size; unsigned int total_rx_ring_size; unsigned int max_buf_size; + unsigned int pagepool_order; =20 struct platform_device *pdev; =20 diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethern= et/freescale/fec_main.c index 24ce808b0c05..b6ce56051c79 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -1783,7 +1783,7 @@ fec_enet_rx_queue(struct net_device *ndev, u16 queue_= id, int budget) * These get messed up if we get called due to a busy condition. */ bdp =3D rxq->bd.cur; 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charset="utf-8" Add a new rx_frame_size member in the fec_enet_private structure to decouple frame size configuration from max_buf_size. This allows more precise control over RX frame length settings. It is particularly useful for Jumbo frame support because the RX frame size may possible larger than the allocated RX buffer. Signed-off-by: Shenwei Wang --- drivers/net/ethernet/freescale/fec.h | 1 + drivers/net/ethernet/freescale/fec_main.c | 7 ++++--- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/fr= eescale/fec.h index 47317346b2f3..f1032a11aa76 100644 --- a/drivers/net/ethernet/freescale/fec.h +++ b/drivers/net/ethernet/freescale/fec.h @@ -621,6 +621,7 @@ struct fec_enet_private { unsigned int total_rx_ring_size; unsigned int max_buf_size; unsigned int pagepool_order; + unsigned int rx_frame_size; =20 struct platform_device *pdev; =20 diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethern= et/freescale/fec_main.c index b6ce56051c79..6d0d97bb077c 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -1148,8 +1148,8 @@ fec_restart(struct net_device *ndev) u32 rcntl =3D FEC_RCR_MII; u32 ecntl =3D FEC_ECR_ETHEREN; =20 - if (fep->max_buf_size =3D=3D OPT_FRAME_SIZE) - rcntl |=3D (fep->max_buf_size << 16); 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charset="utf-8" Add a fec_change_mtu() handler to recalculate the pagepool_order based on the new_mtu value. It will update the rx_frame_size accordingly if the pagepool_order is changed. If the interface is running, it stops RX/TX, and recreate the pagepool with the new configuration. Signed-off-by: Shenwei Wang --- drivers/net/ethernet/freescale/fec_main.c | 44 +++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethern= et/freescale/fec_main.c index 6d0d97bb077c..aa85a6d0b44f 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -4023,6 +4023,49 @@ static int fec_hwtstamp_set(struct net_device *ndev, return fec_ptp_set(ndev, config, extack); } =20 +static int fec_change_mtu(struct net_device *ndev, int new_mtu) +{ + struct fec_enet_private *fep =3D netdev_priv(ndev); + int order, done; + bool running; + + order =3D get_order(new_mtu + ETH_HLEN + ETH_FCS_LEN); + if (fep->pagepool_order =3D=3D order) { + WRITE_ONCE(ndev->mtu, new_mtu); + return 0; + } + + fep->pagepool_order =3D order; + fep->rx_frame_size =3D (PAGE_SIZE << order) - FEC_ENET_XDP_HEADROOM + - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); + + running =3D netif_running(ndev); + if (!running) { + WRITE_ONCE(ndev->mtu, new_mtu); + return 0; + } + + /* Stop TX/RX and free the buffers */ + napi_disable(&fep->napi); + netif_tx_disable(ndev); + read_poll_timeout(fec_enet_rx_napi, done, (done =3D=3D 0), + 10, 1000, false, &fep->napi, 10); + fec_stop(ndev); + fec_enet_free_buffers(ndev); + + WRITE_ONCE(ndev->mtu, new_mtu); + + /* Create the pagepool according the new mtu */ + if (fec_enet_alloc_buffers(ndev) < 0) + return -ENOMEM; + + fec_restart(ndev); + napi_enable(&fep->napi); + netif_tx_start_all_queues(ndev); + + return 0; +} + static const struct net_device_ops fec_netdev_ops =3D { .ndo_open =3D fec_enet_open, .ndo_stop =3D fec_enet_close, @@ -4032,6 +4075,7 @@ static const struct net_device_ops fec_netdev_ops =3D= { .ndo_validate_addr =3D eth_validate_addr, .ndo_tx_timeout =3D fec_timeout, .ndo_set_mac_address =3D fec_set_mac_address, + .ndo_change_mtu =3D fec_change_mtu, .ndo_eth_ioctl =3D phy_do_ioctl_running, .ndo_set_features =3D fec_set_features, .ndo_bpf =3D fec_enet_bpf, --=20 2.43.0 From nobody Sat Oct 4 00:26:56 2025 Received: from DU2PR03CU002.outbound.protection.outlook.com (mail-northeuropeazon11011025.outbound.protection.outlook.com [52.101.65.25]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8878D34DCCD; 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charset="utf-8" Certain i.MX SoCs, such as i.MX8QM and i.MX8QXP, feature enhanced FEC hardware that supports Ethernet Jumbo frames with packet sizes up to 16K bytes. When Jumbo frames are enabled, the TX FIFO may not be large enough to hold an entire frame. To accommodate this, the FIFO should be configured to operate in cut-through mode, 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 | 28 +++++++++++++++++++---- 2 files changed, 27 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/fr= eescale/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) =20 +/* 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/ethern= et/freescale/fec_main.c index aa85a6d0b44f..160d49e6f86c 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 =3D { 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, }; =20 static const struct fec_devinfo fec_s32v234_info =3D { @@ -233,6 +234,7 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address"); * 2048 byte skbufs are allocated. However, alignment requirements * varies between FEC variants. Worst case is 64, so round down by 64. */ +#define MAX_JUMBO_BUF_SIZE (round_down(16384 - 64, 64)) #define PKT_MAXBUF_SIZE (round_down(2048 - 64, 64)) #define PKT_MINBUF_SIZE 64 =20 @@ -481,6 +483,11 @@ fec_enet_create_page_pool(struct fec_enet_private *fep, }; int err; =20 + if (fep->pagepool_order !=3D 0) { + pp_params.order =3D fep->pagepool_order; + pp_params.max_len =3D fep->rx_frame_size; + } + rxq->page_pool =3D page_pool_create(&pp_params); if (IS_ERR(rxq->page_pool)) { err =3D PTR_ERR(rxq->page_pool); @@ -1281,8 +1288,16 @@ fec_restart(struct net_device *ndev) if (fep->quirks & FEC_QUIRK_ENET_MAC) { /* enable ENET endian swap */ ecntl |=3D 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 this case, 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) + writel(0xF, fep->hwp + FEC_X_WMRK); + else + writel(FEC_TXWMRK_STRFWD, fep->hwp + FEC_X_WMRK); } =20 if (fep->bufdesc_ex) @@ -4608,7 +4623,12 @@ fec_probe(struct platform_device *pdev) =20 fep->pagepool_order =3D 0; fep->rx_frame_size =3D FEC_ENET_RX_FRSIZE; - fep->max_buf_size =3D PKT_MAXBUF_SIZE; + + if (fep->quirks & FEC_QUIRK_JUMBO_FRAME) + fep->max_buf_size =3D MAX_JUMBO_BUF_SIZE; + else + fep->max_buf_size =3D PKT_MAXBUF_SIZE; + ndev->max_mtu =3D fep->max_buf_size - ETH_HLEN - ETH_FCS_LEN; =20 ret =3D register_netdev(ndev); --=20 2.43.0