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charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <20260909-patches_v2_external-v2-3-3a40babaff4c@amd.com> References: <20260909-patches_v2_external-v2-0-3a40babaff4c@amd.com> In-Reply-To: <20260909-patches_v2_external-v2-0-3a40babaff4c@amd.com> To: Nagadheeraj Rottela , Andrew Lunn , "David S. Miller" , "Eric Dumazet" , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Richard Cochran , Michal Simek , "Sebastian Andrzej Siewior" , Clark Williams , Steven Rostedt CC: , , , , , Srinivas Neeli , , X-Mailer: b4 0.16.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF00036F42:EE_|PH8PR12MB7112:EE_ X-MS-Office365-Filtering-Correlation-Id: 1f7ee20c-1695-40fe-b4aa-08df0dde3ca1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|1800799024|376014|82310400026|36860700016|7416014|10067099003|18002099003|22082099003|11063799006|56012099006|921020; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(23010399003)(1800799024)(376014)(82310400026)(36860700016)(7416014)(10067099003)(18002099003)(22082099003)(11063799006)(56012099006)(921020);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: SMol4o8859tYihef6aHjmGnRBi4magRf6qB/MkEhdqjxOyGjIMEvb18mMwYLB8sBrQbI1J2ZXeZWQ+izTAxL1ub5wsYSOAISFf37KhQyZPI/JlHEMRaNi7KI/xDkIC7l6yEyREq/Wb0rfvwT0P6AXuJFcB/8ysmlag0xePk77FcAziuC/hAvBz705Zab9gGWzJ4B1myBphePrrE/a43/gkDZjVImq1hKmaQuKw3lfv2Q76N1MHhhx9n+888GtqeQZoBx+MFS/pF72Ur0yYTCbcMWOS6wUyOysl2uQRJ0sYKXF05jujSlDyGhf9sr0rlSKsuE+zwnHYIRUAlOfwxB9i8aEbVFox3a3N/G6iqpYarMR0kPJXyLqZKC/oXBV117iZREZeWpZYkbMgIQVZK6FeSqhus/MYHI4jRwJajESoOpuhPKMaLLr5cDi4ofyYH3 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Sep 2026 19:20:26.0396 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1f7ee20c-1695-40fe-b4aa-08df0dde3ca1 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF00036F42.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7112 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260908_122035_512738_EBF4638E X-CRM114-Status: GOOD ( 28.40 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The TSN Endpoint MAC owns the IP's host-side MCDMA data path and is the netdev physically wired to the CPU. 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 named "ep", 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 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..089f17a126f5 --- /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 ("ep0" for the first IP instance) + * @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_netdev(sizeof(*ep), "ep%d", NET_NAME_ENUM, ether_setup); + 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