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Received: from PAXPR04MB8510.eurprd04.prod.outlook.com (2603:10a6:102:211::7) by AM9PR04MB8195.eurprd04.prod.outlook.com (2603:10a6:20b:3b7::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9700.24; Mon, 16 Mar 2026 09:41:00 +0000 Received: from PAXPR04MB8510.eurprd04.prod.outlook.com ([fe80::b476:c19a:24cd:3694]) by PAXPR04MB8510.eurprd04.prod.outlook.com ([fe80::b476:c19a:24cd:3694%3]) with mapi id 15.20.9700.022; Mon, 16 Mar 2026 09:41:28 +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 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 net-next 09/14] net: dsa: add NETC switch tag support Date: Mon, 16 Mar 2026 17:41:47 +0800 Message-Id: <20260316094152.1558671-10-wei.fang@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260316094152.1558671-1-wei.fang@nxp.com> References: <20260316094152.1558671-1-wei.fang@nxp.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SI2PR02CA0019.apcprd02.prod.outlook.com (2603:1096:4:195::13) To PAXPR04MB8510.eurprd04.prod.outlook.com (2603:10a6:102:211::7) 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: PAXPR04MB8510:EE_|AM9PR04MB8195:EE_ X-MS-Office365-Filtering-Correlation-Id: b4e334da-06f2-4da1-475d-08de83403295 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|19092799006|366016|1800799024|376014|7416014|52116014|921020|38350700014|18002099003|56012099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?S7gNDQjyu8jETRILph0yxF6ELaA2YNUenXy6000UG313sTs/SveJeDAqcW/T?= =?us-ascii?Q?gB6qXBJ5/vDRgK7JnocZ0utx5dWT5wkKEhOFbahlQzoNJOsfoE3vlsWQIktv?= =?us-ascii?Q?26EGBwcfgU8l7djxdgrRQwCRiPAQ72aHfOlS7AElhS5XJHnW8+U6Bsa/9Ysb?= =?us-ascii?Q?1p4Z05/+sfnWk/rDQWw9OhYTF2bxpr9THEkWc73foYx+2jX+fu9evXu7iSlo?= =?us-ascii?Q?Oh39J4aKOLSLXLMkC3PsKYdM1lSXbwzjYDSgplAfQfXAfjTlbWH7RvUypusg?= =?us-ascii?Q?FO4SojqHj+EI+Gt+PDM90LBxlnGVzFOJGEs2ikVwtna0f9H1yw8ywg9MIq0I?= =?us-ascii?Q?SQ2l+Pfy5nrkH6suGtC4yH7aUUAO++H55bBzrhC4P3dy0ueQ2liBmRKndnvJ?= =?us-ascii?Q?xHcoDEeV1z4SyUCRdXJLSI+tsZfT8J9T0eeTXl56og44wRCnnxFYxi5+IJ1I?= =?us-ascii?Q?gHpHEq/7wIXFPpVJ0HwymzNBOULGA2NtmzZidsp0BVYkSdb5+om2Lol3nta0?= =?us-ascii?Q?dnbxHRFUbPxwmzPbT8SNNmTjcbzDnQdetK49dc1Ei8cTTW0CKo8G/cw47oyJ?= =?us-ascii?Q?csQzQI0p29v/2Fk95HRmfnCjx4UDZS+rgZvaCaRDdo3cHtQoul0uSeiw3wYj?= =?us-ascii?Q?mVlHHZoboYTUdlaQMW0tTmhizxBEPF7VzB2qVXW+iyZkT28pMqDzpv1Y4kRt?= =?us-ascii?Q?4L+Ne3RpSlSmv/x/mA2T6+aZOQfBF0ANUSNXIkwfgyPCKQD+AfbcWwUfJRp6?= =?us-ascii?Q?+Msu1YAc2NK/kqy9KuYIzw/zU0KfL5fvyGWODexEYklaUJqm7ku5Gr3yrlvR?= =?us-ascii?Q?hWhlfeJTw/FkbY0qr2lIaYWNj+TDnm8iEjcFh3+Ay+yLdhOWmxR5MxPqN4sa?= =?us-ascii?Q?p2XHAtrhO1bFKvkBkFEkvtJdTA/jXCrrwiiPz/djveoaCMpJCiFcyJyRF9bU?= =?us-ascii?Q?gIRRVlOr6K+0SW7fu3NXQFCU9lcy8KiOZMo1WrcZZ2aZFz0qBb+AE7V25WcJ?= =?us-ascii?Q?WA101ZFBoEP3/CHpclIdci9RRkXQQ3NNd9FFY2GMEdlwRoq9TrcTYYJHRa2S?= =?us-ascii?Q?Xowfkx7YmiUam2NaIwerh9Icult03hzZrtZq9CYG0JuGeRpvgX+M1DgDhnqZ?= =?us-ascii?Q?1Vro0wHjB6c/ygEQS1A/bcI9r/OOQfYZfEp80is4Zft+EewDwta4g82wFdXO?= =?us-ascii?Q?qu+g+Mw01Q4IEEf60LPSVRWrUiTtHO9xc07S1dqtfIBdZHixIOIGJ2BfJRGW?= =?us-ascii?Q?pY6uT8gYm/NnjKHRA6VeUDY4wSjdKXcmEbidaBxXqEK+hR7jk23DmBAPZi8q?= =?us-ascii?Q?O6sFKDp3r6VM9EPWHaMJQEW4ZH+S+0yDQY6t26m3vwpKRpsn0p6di7MDSHPp?= =?us-ascii?Q?rFiriOcBe2Y76Io6Ue2yJ5ikmxozFCzVEch6lNn3E3lYeIuSa12Pl32WVFTX?= =?us-ascii?Q?eWA4IjW4uPx4bcja9Ix2GhWRSrE6hY9vduFy9BLTHL56z15HYS7OHNSr/qYI?= =?us-ascii?Q?5XUL9pJvvNcVtXZzOCOxljMW1RuR46EejHXKTFDnhXzFHLgfeGEI5bBsQ8+L?= =?us-ascii?Q?fxowoRo430qAKliCn5usaYnEGvYrEe2emLb+WfJarzedUIVilzpX0xwGcL0H?= =?us-ascii?Q?s9cvWTntt4zQqzGQA3TSpa+LujsTq/vqixukmxw6u0ec1nAxMMTYbcWecPTX?= =?us-ascii?Q?23s2Azkqpg7pfF88gdZ+eNixCdx5expzun3SsNNxO9WSmofe?= X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: b4e334da-06f2-4da1-475d-08de83403295 X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB8510.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Mar 2026 09:41:28.5965 (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: pmg8zL+xRvlnB/F2v8cssvXno7QlZHFRoJlgQ/pH9E9HVZlgY4LfEI0pDC5PbhP8J6cibUyzSAkWc+WqztyPJw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR04MB8195 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 | 180 ++++++++++++++++++++++++++++++++++ 6 files changed, 208 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 6c17446f3dcc..6bed824d1f07 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..15b0dd5c5408 --- /dev/null +++ b/net/dsa/tag_netc.c @@ -0,0 +1,180 @@ +// 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); + u8 ipv = netdev_txq_to_tc(ndev, queue); + void *tag; + + 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); + 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 rx_type) +{ + int type = FIELD_GET(NETC_TAG_TYPE, rx_type); + + if (type == NETC_TAG_TO_HOST) { + u8 subtype = rx_type & NETC_TAG_SUBTYPE; + + 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 = dsa_etype_header_pos_rx(skb); + int tag_len = netc_get_rx_tag_len(tag_cmn->type); + int sw_id, port; + + 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 = 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; + + if (tag_cmn->type == NETC_TAG_FORWARD) + dsa_default_offload_fwd_mark(skb); + + /* Remove Switch tag from the frame */ + 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 tag_len = netc_get_rx_tag_len(tag_cmn->type); + + *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