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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by BL2PEPF000352CC.mail.protection.outlook.com (10.167.249.134) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.615.4 via Frontend Transport; Fri, 13 Nov 2026 12:01:40 +0000 Received: from satlexmb08.amd.com (10.181.42.217) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.53; Thu, 12 Nov 2026 12:47:27 -0600 Received: from xhdsneeli40.xilinx.com (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server id 15.2.2562.53 via Frontend Transport; Thu, 12 Nov 2026 12:47:22 -0600 From: Srinivas Neeli Date: Fri, 13 Nov 2026 00:16:47 +0530 Subject: [PATCH net-next v4 3/8] net: xilinx: tsn: add endpoint MAC driver skeleton X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <20261113-patches_v2_external-v4-3-56bb26f042a4@amd.com> References: <20261113-patches_v2_external-v4-0-56bb26f042a4@amd.com> In-Reply-To: <20261113-patches_v2_external-v4-0-56bb26f042a4@amd.com> To: Nagadheeraj Rottela , Andrew Lunn , "David S. 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The DSA switch needs this netdev to exist as its conduit. Add a platform driver (compatible "xlnx,tsn-ep-mac") for the endpoint. Register the netdev with the standard eth%d name, set its MAC address, and provide minimal netdev and ethtool ops. ndo_open starts the queues and ndo_start_xmit drops frames. Co-developed-by: Nagadheeraj Rottela Signed-off-by: Nagadheeraj Rottela Signed-off-by: Srinivas Neeli --- Changes in v4: - Use alloc_etherdev() so the standard eth%d name is registered with NET_NAME_ENUM. Changes in v3: - Register the netdev with the standard eth%d name (NET_NAME_UNKNOWN) instead of a custom "ep%d". Changes in v2: - Name the netdev ep%d with NET_NAME_ENUM instead of a fixed "ep", so a second IP instance does not clash on register_netdev(). The %d enumeration is what NET_NAME_ENUM describes, and it matches the eth%d naming in net/dsa/user.c. - Drop the mapped but unused register window (ep->regs and its ioremap). It was intended for QBV support, which is not part of this series, so the endpoint driver does not use it. The mapping will be re-added when QBV support lands. - Use dev_kfree_skb_any() on the drop path, not dev_kfree_skb(). - Drop the mod_devicetable.h include, platform_device.h already pulls it in. --- drivers/net/ethernet/xilinx/tsn/Makefile | 2 +- drivers/net/ethernet/xilinx/tsn/xilinx_tsn.h | 15 +++ drivers/net/ethernet/xilinx/tsn/xilinx_tsn_ep.c | 143 ++++++++++++++++++++++ drivers/net/ethernet/xilinx/tsn/xilinx_tsn_main.c | 3 + 4 files changed, 162 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/xilinx/tsn/Makefile b/drivers/net/ethernet/xilinx/tsn/Makefile index 6f99226f3dc8..5886828b386f 100644 --- a/drivers/net/ethernet/xilinx/tsn/Makefile +++ b/drivers/net/ethernet/xilinx/tsn/Makefile @@ -1,2 +1,2 @@ obj-$(CONFIG_XILINX_TSN) += xilinx_tsn.o -xilinx_tsn-y := xilinx_tsn_main.o +xilinx_tsn-y := xilinx_tsn_main.o xilinx_tsn_ep.o diff --git a/drivers/net/ethernet/xilinx/tsn/xilinx_tsn.h b/drivers/net/ethernet/xilinx/tsn/xilinx_tsn.h new file mode 100644 index 000000000000..b0757e22d1fd --- /dev/null +++ b/drivers/net/ethernet/xilinx/tsn/xilinx_tsn.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * AMD/Xilinx TSN Endpoint Ethernet MAC driver, shared definitions. + * + * Copyright (C) 2026 Advanced Micro Devices, Inc. + */ + +#ifndef _XILINX_TSN_H +#define _XILINX_TSN_H + +#include + +extern struct platform_driver xlnx_tsn_ep_driver; + +#endif /* _XILINX_TSN_H */ diff --git a/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_ep.c b/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_ep.c new file mode 100644 index 000000000000..b6458bb0ba0f --- /dev/null +++ b/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_ep.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * AMD/Xilinx TSN Endpoint MAC driver. + * + * Copyright (C) 2026 Advanced Micro Devices, Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "xilinx_tsn.h" + +#define DRIVER_NAME "xilinx_tsn_ep" + +/** + * struct xlnx_tsn_ep - EP MAC private data, embedded in net_device priv area + * @ndev: the conduit netdev + * @dev: backing device + */ +struct xlnx_tsn_ep { + struct net_device *ndev; + struct device *dev; +}; + +static netdev_tx_t ep_start_xmit(struct sk_buff *skb, struct net_device *ndev) +{ + dev_kfree_skb_any(skb); + DEV_STATS_INC(ndev, tx_dropped); + return NETDEV_TX_OK; +} + +static int ep_open(struct net_device *ndev) +{ + netif_tx_start_all_queues(ndev); + + return 0; +} + +static int ep_stop(struct net_device *ndev) +{ + netif_tx_disable(ndev); + + return 0; +} + +static void ep_get_drvinfo(struct net_device *ndev, struct ethtool_drvinfo *ed) +{ + strscpy(ed->driver, DRIVER_NAME, sizeof(ed->driver)); +} + +static const struct net_device_ops ep_netdev_ops = { + .ndo_open = ep_open, + .ndo_stop = ep_stop, + .ndo_start_xmit = ep_start_xmit, + .ndo_validate_addr = eth_validate_addr, + .ndo_set_mac_address = eth_mac_addr, +}; + +static const struct ethtool_ops ep_ethtool_ops = { + .get_drvinfo = ep_get_drvinfo, +}; + +static int xlnx_tsn_ep_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct net_device *ndev; + struct xlnx_tsn_ep *ep; + u8 mac_addr[ETH_ALEN]; + int ret; + + ndev = alloc_etherdev(sizeof(*ep)); + if (!ndev) + return -ENOMEM; + + SET_NETDEV_DEV(ndev, dev); + ndev->netdev_ops = &ep_netdev_ops; + ndev->ethtool_ops = &ep_ethtool_ops; + ndev->features = NETIF_F_SG; + + ep = netdev_priv(ndev); + ep->ndev = ndev; + ep->dev = dev; + + ret = of_get_mac_address(dev->of_node, mac_addr); + if (ret == -EPROBE_DEFER) { + goto err_free_ndev; + } else if (!ret && is_valid_ether_addr(mac_addr)) { + eth_hw_addr_set(ndev, mac_addr); + } else { + eth_hw_addr_random(ndev); + dev_info(dev, "no valid MAC in DT, using random address %pM\n", + ndev->dev_addr); + } + + platform_set_drvdata(pdev, ep); + + ret = register_netdev(ndev); + if (ret) { + dev_err_probe(dev, ret, "failed to register net device\n"); + goto err_free_ndev; + } + + return 0; + +err_free_ndev: + free_netdev(ndev); + return ret; +} + +static void xlnx_tsn_ep_remove(struct platform_device *pdev) +{ + struct xlnx_tsn_ep *ep = platform_get_drvdata(pdev); + + if (!ep) + return; + + unregister_netdev(ep->ndev); + free_netdev(ep->ndev); +} + +static const struct of_device_id xlnx_tsn_ep_of_match[] = { + { .compatible = "xlnx,tsn-ep-mac" }, + { } +}; +MODULE_DEVICE_TABLE(of, xlnx_tsn_ep_of_match); + +struct platform_driver xlnx_tsn_ep_driver = { + .probe = xlnx_tsn_ep_probe, + .remove = xlnx_tsn_ep_remove, + .driver = { + .name = DRIVER_NAME, + .of_match_table = xlnx_tsn_ep_of_match, + }, +}; diff --git a/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_main.c b/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_main.c index afe7609c67fb..d33a00dd6d15 100644 --- a/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_main.c +++ b/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_main.c @@ -15,6 +15,8 @@ #include #include +#include "xilinx_tsn.h" + #define TSN_NUM_CLOCKS 6 /** @@ -85,6 +87,7 @@ static struct platform_driver tsn_driver = { static struct platform_driver * const tsn_drivers[] = { &tsn_driver, + &xlnx_tsn_ep_driver, }; static int __init xlnx_tsn_init(void) -- 2.43.0