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Received: from DBBPR04MB7500.eurprd04.prod.outlook.com (2603:10a6:10:1f4::16) by GV1PR04MB11525.eurprd04.prod.outlook.com (2603:10a6:150:282::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9913.11; Wed, 13 May 2026 03:03:32 +0000 Received: from DBBPR04MB7500.eurprd04.prod.outlook.com ([fe80::c291:543b:4bde:cee7]) by DBBPR04MB7500.eurprd04.prod.outlook.com ([fe80::c291:543b:4bde:cee7%6]) with mapi id 15.20.9913.009; Wed, 13 May 2026 03:03:32 +0000 From: Wei Fang To: claudiu.manoil@nxp.com, vladimir.oltean@nxp.com, xiaoning.wang@nxp.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, f.fainelli@gmail.com, frank.li@nxp.com, chleroy@kernel.org, horms@kernel.org, linux@armlinux.org.uk, maxime.chevallier@bootlin.com, andrew@lunn.ch, olteanv@gmail.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev Subject: [PATCH v7 net-next 09/15] net: dsa: add NETC switch tag support Date: Wed, 13 May 2026 11:04:48 +0800 Message-Id: <20260513030454.1666570-10-wei.fang@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260513030454.1666570-1-wei.fang@nxp.com> References: <20260513030454.1666570-1-wei.fang@nxp.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MA5P287CA0029.INDP287.PROD.OUTLOOK.COM (2603:1096:a01:17a::13) To DBBPR04MB7500.eurprd04.prod.outlook.com (2603:10a6:10:1f4::16) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DBBPR04MB7500:EE_|GV1PR04MB11525:EE_ X-MS-Office365-Filtering-Correlation-Id: 1efe5f85-b767-4a1e-85b8-08deb09c375c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|52116014|366016|19092799006|56012099003|18002099003|22082099003|3023799003|11063799003|38350700014|921020; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?zvAgQGe5upNBmZBYEulYKTy9w4/N48OiCKyR+qxta08akVPjzgbCLigWqMLx?= =?us-ascii?Q?B0IWd96rLWV7uxTB1tAAzJbwofqG1D1RKyxZ64mln+aWQG+9MTh/LJ7UnKye?= =?us-ascii?Q?AKgIupI6vnMmysdD/JsQwDQPh43yaPNoCTl9XsDH2jiD27aZWsaQH2Gq6Gre?= =?us-ascii?Q?/kucqp8XQMxp0FJ9xSIW+3dBAp1OJhpJAzqghWCSlaVeo+Fy0CeI6L5f7gEA?= =?us-ascii?Q?jnpocC+Um7IRZtuUTfCwxuKDO1nNUCetbpAlQsU/yRVRH/KB+KZgi7I9rmpx?= =?us-ascii?Q?4OymB5ThM9ynjXPNvA5j6OgyBYhrna1kf/svctVAzHKheBi+PQJzKK29yiLu?= =?us-ascii?Q?jtzw1U058gP51s5SPHTyAaLs5NoqsrYXw2xt+dWluPsQs+9VKkjNp6ihQpNN?= =?us-ascii?Q?LAYPs7HMiPMdxuhfKTiSLlxydbrB2omfMqHj2CDjaZZj9ckva4qPuxn7hY9G?= =?us-ascii?Q?EG7xh5G2sn5QF7JUmHaDUZy0rEo+YGkgPlHVsaLBrlEPYULoczSt6PMridDV?= =?us-ascii?Q?9dAJizaB676ZgVzJSSgkq+DtyTc/++/xQxUypj69msZ3sJGUNgJ848jM7Haa?= =?us-ascii?Q?JnjQBpMNik963uQcp2BVizRsnz9VoZ7GuwJL5THiVnU+/BXtTK06HMy6wQcn?= =?us-ascii?Q?jvlytm92my/5XaLbglQVTe5MILePIl++u7khrg0zYtuKaPxYP/hfzV8ZBdlf?= =?us-ascii?Q?NC5oDbHjfilHIXeh55yPWx+4npr9vqZ3iRAEuLRyDtjiodvdxJTXl7CtvRxR?= =?us-ascii?Q?H0koF1PmCiFDRJdCai6Fsufnlxzdvmy47Of1lh7yRrEoDHWtmh1u/79ZesSW?= =?us-ascii?Q?BpY1xwESwqE4UHblDV5baqlgnSK54QMeke/YbrHMSO3vrIy4QjinGs6ixFIA?= =?us-ascii?Q?0xyGR0TyX91xdSmqu5LjattcTea+MYygaWE6v3BgF5QB4YZZA2sbW0IATKn8?= =?us-ascii?Q?Grnp8l/BFramkvtDHMUmUugnXng8wz6OfeInOES0Sy9JxtvVvWw810IcFYph?= =?us-ascii?Q?yftRvQSQuVPxxIw3ido3cqKhcX3D0P2v429ujw+dJAGYE4NCSOC0mjUL99Yy?= =?us-ascii?Q?15Cfv5b1oS2zt4BfZZ3/J1oGn1skZOr8/OPvqC0aUcBbP8xyeKTl6GZbsv0i?= =?us-ascii?Q?a+jjiQhGWbEn8zVcjGdjbFZURIEO25n8QUaumlN00xZ8U4BaUVcAXWKIaJY1?= =?us-ascii?Q?7Gq79KZ41f0p4Slz4d6ul7JoW1Of0HI+jZCtAn7X9F1NsucSGCkroAfCWEF1?= =?us-ascii?Q?F7CX6GI6RidMN6HpYjMeR6+kZF+JKnXu7o7xaSev9dtHK5r81/0Qx3TGy51H?= =?us-ascii?Q?9MusTDJjtg+Ie6pXs72v1TO6K33qiA206WepMttzoqy8nTp5mPsdu2VPAwJH?= =?us-ascii?Q?VsW9SmTobOiTfo0agKqFInB2SIj2qmCdkKXk2sf+qjtAW/t//KkPwgDJ2jR8?= =?us-ascii?Q?zKljbzlzzA6o4m531ckE/io6X0btZqogjS0QCj0wKKOp8CLrU6i4M6PPeXlO?= =?us-ascii?Q?djVmPpUWaWZLSA5DuMZnrPesULkzvwyToGe1X5ZG+pEDSRTVyPjGLq4e2Cm+?= =?us-ascii?Q?YVFDLXMyXA767Cq675fV9EznfQNdoNaIPhkJm9hK5pvCHvJhsWUdXTUKETDq?= =?us-ascii?Q?XPPpkpi27X8JYnp43ExPH1eIqqhz1zbLxvitb4WtzAHrbfEGutl71Wyf7nS0?= =?us-ascii?Q?GrMbiLS5go8XS0kG2CZU46nRLrNStQTjAHomv7ZBnuNTzKOd?= X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1efe5f85-b767-4a1e-85b8-08deb09c375c X-MS-Exchange-CrossTenant-AuthSource: DBBPR04MB7500.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 May 2026 03:03:32.5684 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: IaspN3MqpamNwB03KWS6/R5gqlXBlaOselvNBxoCZb9ejbzBEjpSv9ajeJQ5ZJpgiJHZGuuhakuyYTdruSSJUA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV1PR04MB11525 The NXP NETC switch tag is a proprietary header added to frames after the source MAC address. The switch tag has 3 types, and each type has 1 ~ 4 subtypes, the details are as follows. Forward NXP switch tag (Type=0): Represents forwarded frames. - SubType = 0 - Normal frame processing. To_Port NXP switch tag (Type=1): Represents frames that are to be sent to a specific switch port. - SubType = 0. No request to perform timestamping. - SubType = 1. Request to perform one-step timestamping. - SubType = 2. Request to perform two-step timestamping. - SubType = 3. Request to perform both one-step timestamping and two-step timestamping. To_Host NXP switch tag (Type=2): Represents frames redirected or copied to the switch management port. - SubType = 0. Received frames redirected or copied to the switch management port. - SubType = 1. Received frames redirected or copied to the switch management port with captured timestamp at the switch port where the frame was received. - SubType = 2. Transmit timestamp response (two-step timestamping). In addition, the length of different type switch tag is different, the minimum length is 6 bytes, the maximum length is 14 bytes. Currently, Forward tag, SubType 0 of To_Port tag and Subtype 0 of To_Host tag are supported. More tags will be supported in the future. Signed-off-by: Wei Fang --- include/linux/dsa/tag_netc.h | 14 +++ include/net/dsa.h | 2 + include/uapi/linux/if_ether.h | 1 + net/dsa/Kconfig | 10 ++ net/dsa/Makefile | 1 + net/dsa/tag_netc.c | 214 ++++++++++++++++++++++++++++++++++ 6 files changed, 242 insertions(+) create mode 100644 include/linux/dsa/tag_netc.h create mode 100644 net/dsa/tag_netc.c diff --git a/include/linux/dsa/tag_netc.h b/include/linux/dsa/tag_netc.h new file mode 100644 index 000000000000..fe964722e5b0 --- /dev/null +++ b/include/linux/dsa/tag_netc.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 + * + * Copyright 2025-2026 NXP + */ + +#ifndef __NET_DSA_TAG_NETC_H +#define __NET_DSA_TAG_NETC_H + +#include +#include + +#define NETC_TAG_MAX_LEN 14 + +#endif diff --git a/include/net/dsa.h b/include/net/dsa.h index 4cc67469cf2e..8c16ef23cc10 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -58,6 +58,7 @@ struct tc_action; #define DSA_TAG_PROTO_YT921X_VALUE 30 #define DSA_TAG_PROTO_MXL_GSW1XX_VALUE 31 #define DSA_TAG_PROTO_MXL862_VALUE 32 +#define DSA_TAG_PROTO_NETC_VALUE 33 enum dsa_tag_protocol { DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE, @@ -93,6 +94,7 @@ enum dsa_tag_protocol { DSA_TAG_PROTO_YT921X = DSA_TAG_PROTO_YT921X_VALUE, DSA_TAG_PROTO_MXL_GSW1XX = DSA_TAG_PROTO_MXL_GSW1XX_VALUE, DSA_TAG_PROTO_MXL862 = DSA_TAG_PROTO_MXL862_VALUE, + DSA_TAG_PROTO_NETC = DSA_TAG_PROTO_NETC_VALUE, }; struct dsa_switch; diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h index df9d44a11540..fb5efc8e06cc 100644 --- a/include/uapi/linux/if_ether.h +++ b/include/uapi/linux/if_ether.h @@ -123,6 +123,7 @@ #define ETH_P_DSA_A5PSW 0xE001 /* A5PSW Tag Value [ NOT AN OFFICIALLY REGISTERED ID ] */ #define ETH_P_IFE 0xED3E /* ForCES inter-FE LFB type */ #define ETH_P_AF_IUCV 0xFBFB /* IBM af_iucv [ NOT AN OFFICIALLY REGISTERED ID ] */ +#define ETH_P_NXP_NETC 0xFD3A /* NXP NETC DSA [ NOT AN OFFICIALLY REGISTERED ID ] */ #define ETH_P_802_3_MIN 0x0600 /* If the value in the ethernet type is more than this value * then the frame is Ethernet II. Else it is 802.3 */ diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig index 5ed8c704636d..d5e725b90d78 100644 --- a/net/dsa/Kconfig +++ b/net/dsa/Kconfig @@ -125,6 +125,16 @@ config NET_DSA_TAG_KSZ Say Y if you want to enable support for tagging frames for the Microchip 8795/937x/9477/9893 families of switches. +config NET_DSA_TAG_NETC + tristate "Tag driver for NXP NETC switches" + help + Say Y or M if you want to enable support for the NXP Switch Tag (NST), + as implemented by NXP NETC switches having version 4.3 or later. The + switch tag is a proprietary header added to frames after the source + MAC address, it has 3 types and each type has different subtypes, so + its length depends on the type and subtype of the tag, the maximum + length is 14 bytes. + config NET_DSA_TAG_OCELOT tristate "Tag driver for Ocelot family of switches, using NPI port" select PACKING diff --git a/net/dsa/Makefile b/net/dsa/Makefile index bf7247759a64..b8c2667cd14a 100644 --- a/net/dsa/Makefile +++ b/net/dsa/Makefile @@ -30,6 +30,7 @@ obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o obj-$(CONFIG_NET_DSA_TAG_MXL_862XX) += tag_mxl862xx.o obj-$(CONFIG_NET_DSA_TAG_MXL_GSW1XX) += tag_mxl-gsw1xx.o +obj-$(CONFIG_NET_DSA_TAG_NETC) += tag_netc.o obj-$(CONFIG_NET_DSA_TAG_NONE) += tag_none.o obj-$(CONFIG_NET_DSA_TAG_OCELOT) += tag_ocelot.o obj-$(CONFIG_NET_DSA_TAG_OCELOT_8021Q) += tag_ocelot_8021q.o diff --git a/net/dsa/tag_netc.c b/net/dsa/tag_netc.c new file mode 100644 index 000000000000..07684e0ff064 --- /dev/null +++ b/net/dsa/tag_netc.c @@ -0,0 +1,214 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2025-2026 NXP + */ + +#include + +#include "tag.h" + +#define NETC_NAME "nxp_netc" + +/* Forward NXP switch tag */ +#define NETC_TAG_FORWARD 0 + +/* To_Port NXP switch tag */ +#define NETC_TAG_TO_PORT 1 +/* SubType0: No request to perform timestamping */ +#define NETC_TAG_TP_SUBTYPE0 0 + +/* To_Host NXP switch tag */ +#define NETC_TAG_TO_HOST 2 +/* SubType0: frames redirected or copied to CPU port */ +#define NETC_TAG_TH_SUBTYPE0 0 +/* SubType1: frames redirected or copied to CPU port with timestamp */ +#define NETC_TAG_TH_SUBTYPE1 1 +/* SubType2: Transmit timestamp response (two-step timestamping) */ +#define NETC_TAG_TH_SUBTYPE2 2 + +/* NETC switch tag lengths */ +#define NETC_TAG_FORWARD_LEN 6 +#define NETC_TAG_TP_SUBTYPE0_LEN 6 +#define NETC_TAG_TH_SUBTYPE0_LEN 6 +#define NETC_TAG_TH_SUBTYPE1_LEN 14 +#define NETC_TAG_TH_SUBTYPE2_LEN 14 +#define NETC_TAG_CMN_LEN 5 + +#define NETC_TAG_SUBTYPE GENMASK(3, 0) +#define NETC_TAG_TYPE GENMASK(7, 4) +#define NETC_TAG_QV BIT(0) +#define NETC_TAG_IPV GENMASK(4, 2) +#define NETC_TAG_SWITCH GENMASK(2, 0) +#define NETC_TAG_PORT GENMASK(7, 3) + +struct netc_tag_cmn { + __be16 tpid; + u8 type; + u8 qos; + u8 switch_port; +} __packed; + +static void netc_fill_common_tag(struct netc_tag_cmn *tag, u8 type, + u8 subtype, u8 sw_id, u8 port, u8 ipv) +{ + tag->tpid = htons(ETH_P_NXP_NETC); + tag->type = FIELD_PREP(NETC_TAG_TYPE, type) | + FIELD_PREP(NETC_TAG_SUBTYPE, subtype); + tag->qos = NETC_TAG_QV | FIELD_PREP(NETC_TAG_IPV, ipv); + tag->switch_port = FIELD_PREP(NETC_TAG_SWITCH, sw_id) | + FIELD_PREP(NETC_TAG_PORT, port); +} + +static void *netc_fill_common_tp_tag(struct sk_buff *skb, + struct net_device *ndev, + u8 subtype, int tag_len) +{ + struct dsa_port *dp = dsa_user_to_port(ndev); + u16 queue = skb_get_queue_mapping(skb); + s8 ipv = netdev_txq_to_tc(ndev, queue); + void *tag; + + if (unlikely(ipv < 0)) + ipv = 0; + + skb_push(skb, tag_len); + dsa_alloc_etype_header(skb, tag_len); + + tag = dsa_etype_header_pos_tx(skb); + memset(tag + NETC_TAG_CMN_LEN, 0, tag_len - NETC_TAG_CMN_LEN); + /* As 'dsa,member' is a required property for NETC switch, the member + * is used to specify the switch ID (thus the hardware switch ID and + * the software switch ID are consistent), its range is 1 ~ 7. The + * NETC switch driver will check this value, and if it is invalid, + * the switch driver will fail the probe. + * In addition, according to the nxp,netc-switch.yaml doc, the port + * index will not be greater than 0xf. + */ + netc_fill_common_tag(tag, NETC_TAG_TO_PORT, subtype, + dp->ds->index, dp->index, ipv); + + return tag; +} + +static void netc_fill_tp_tag_subtype0(struct sk_buff *skb, + struct net_device *ndev) +{ + netc_fill_common_tp_tag(skb, ndev, NETC_TAG_TP_SUBTYPE0, + NETC_TAG_TP_SUBTYPE0_LEN); +} + +/* Currently only support To_Port tag, subtype 0 */ +static struct sk_buff *netc_xmit(struct sk_buff *skb, + struct net_device *ndev) +{ + netc_fill_tp_tag_subtype0(skb, ndev); + + return skb; +} + +static int netc_get_rx_tag_len(int type, int subtype) +{ + /* Only NETC_TAG_TO_HOST and NETC_TAG_FORWARD are expected in RX, + * NETC_TAG_TO_PORT is a TX switch tag that does not exist in RX. + */ + if (type == NETC_TAG_TO_HOST) { + if (subtype == NETC_TAG_TH_SUBTYPE1) + return NETC_TAG_TH_SUBTYPE1_LEN; + else if (subtype == NETC_TAG_TH_SUBTYPE2) + return NETC_TAG_TH_SUBTYPE2_LEN; + else + return NETC_TAG_TH_SUBTYPE0_LEN; + } + + return NETC_TAG_FORWARD_LEN; +} + +static struct sk_buff *netc_rcv(struct sk_buff *skb, + struct net_device *ndev) +{ + struct netc_tag_cmn *tag_cmn; + int tag_len, sw_id, port; + int type, subtype; + + if (unlikely(!pskb_may_pull(skb, NETC_TAG_MAX_LEN))) + return NULL; + + tag_cmn = dsa_etype_header_pos_rx(skb); + if (ntohs(tag_cmn->tpid) != ETH_P_NXP_NETC) { + dev_warn_ratelimited(&ndev->dev, "Unknown TPID 0x%04x\n", + ntohs(tag_cmn->tpid)); + + return NULL; + } + + if (tag_cmn->qos & NETC_TAG_QV) + skb->priority = FIELD_GET(NETC_TAG_IPV, tag_cmn->qos); + + sw_id = FIELD_GET(NETC_TAG_SWITCH, tag_cmn->switch_port); + /* ENETC VEPA switch ID (0) is not supported yet */ + if (!sw_id) { + dev_warn_ratelimited(&ndev->dev, + "VEPA switch ID is not supported yet\n"); + + return NULL; + } + + port = FIELD_GET(NETC_TAG_PORT, tag_cmn->switch_port); + skb->dev = dsa_conduit_find_user(ndev, sw_id, port); + if (!skb->dev) + return NULL; + + type = FIELD_GET(NETC_TAG_TYPE, tag_cmn->type); + subtype = FIELD_GET(NETC_TAG_SUBTYPE, tag_cmn->type); + if (type == NETC_TAG_FORWARD) { + dsa_default_offload_fwd_mark(skb); + } else if (type == NETC_TAG_TO_HOST) { + /* Currently only subtype0 supported */ + if (subtype != NETC_TAG_TH_SUBTYPE0) + return NULL; + } else { + dev_warn_ratelimited(&ndev->dev, + "Unknown tag type %d\n", type); + return NULL; + } + + /* Remove Switch tag from the frame */ + tag_len = netc_get_rx_tag_len(type, subtype); + skb_pull_rcsum(skb, tag_len); + dsa_strip_etype_header(skb, tag_len); + + return skb; +} + +static void netc_flow_dissect(const struct sk_buff *skb, __be16 *proto, + int *offset) +{ + struct netc_tag_cmn *tag_cmn = (struct netc_tag_cmn *)(skb->data - 2); + int subtype = FIELD_GET(NETC_TAG_SUBTYPE, tag_cmn->type); + int type = FIELD_GET(NETC_TAG_TYPE, tag_cmn->type); + int tag_len = netc_get_rx_tag_len(type, subtype); + + /* The RX minimum frame length of the NETC switch port is 64 bytes, + * and the frame is received by the ENETC driver. From the hardware + * perspective, the receive buffer of RX BD is at least 128 bytes, + * so the switch tag header is guaranteed to be in the linear region + * of the skb. + */ + *offset = tag_len; + *proto = ((__be16 *)skb->data)[(tag_len / 2) - 1]; +} + +static const struct dsa_device_ops netc_netdev_ops = { + .name = NETC_NAME, + .proto = DSA_TAG_PROTO_NETC, + .xmit = netc_xmit, + .rcv = netc_rcv, + .needed_headroom = NETC_TAG_MAX_LEN, + .flow_dissect = netc_flow_dissect, +}; + +MODULE_DESCRIPTION("DSA tag driver for NXP NETC switch family"); +MODULE_LICENSE("GPL"); + +MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_NETC, NETC_NAME); +module_dsa_tag_driver(netc_netdev_ops); -- 2.34.1