net:tsn: netlink interface for APP layer to config TSN capability hardware ports

This patch provids netlink method to configure the TSN protocols hardwares.
TSN guaranteed packet transport with bounded low latency, low packet delay
variation, and low packet loss by hardware and software methods.

The three basic components of TSN are:

1. Time synchronization: This was implement by 8021AS which base on the
   IEEE1588 precision Time Protocol. This is configured by the other way
   in kernel.
   8021AS not included in this patch.

2. Scheduling and traffic shaping and per-stream filter policing:
   This patch support Qbv/Qci/Qbu/8021CB/Qav etc.

3. Selection of communication paths:
   This patch not support the pure software only TSN protocols(like Qcc)
   but hardware related configuration.

TSN Protocols supports by this patch: Qbv/Qci/Qbu/Credit-base Shaper(Qav).
This patch verified on NXP ls1028ardb board.

Signed-off-by: Po Liu <Po.Liu@nxp.com>

include/net/tsn.h

@@ -0,0 +1,114 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
+/* Copyright 2017-2019 NXP */
+
+#ifndef __TSN_H__
+#define __TSN_H__
+
+#include <linux/notifier.h>
+#include <uapi/linux/tsn.h>
+
+enum tsn_notifier_type {
+	TSN_QBV_CONFIGCHANGETIME_ARRIVE = 1,
+};
+
+struct tsn_notifier_info {
+	struct net_device *dev;
+	union {
+		struct tsn_qbv_conf qbv_notify;
+		struct tsn_qci_psfp_sgi_conf qci_notify;
+	} ntdata;
+};
+
+static inline struct net_device *
+tsn_notifier_info_to_dev(const struct tsn_notifier_info *info)
+{
+	return info->dev;
+}
+
+struct tsn_ops {
+	void (*device_init)(struct net_device *ndev);
+	void (*device_deinit)(struct net_device *ndev);
+	u32 (*get_capability)(struct net_device *ndev);
+	/* Qbv standard */
+	int (*qbv_set)(struct net_device *ndev, struct tsn_qbv_conf *qbvconf);
+	int (*qbv_get)(struct net_device *ndev, struct tsn_qbv_conf *qbvconf);
+	int (*qbv_get_status)(struct net_device *ndev,
+				struct tsn_qbv_status *qbvstat);
+	int (*cb_streamid_set)(struct net_device *ndev, u32 index,
+				bool enable, struct tsn_cb_streamid *sid);
+	int (*cb_streamid_get)(struct net_device *ndev, u32 index,
+				struct tsn_cb_streamid *sid);
+	int (*cb_streamid_counters_get)(struct net_device *ndev, u32 index,
+				struct tsn_cb_streamid_counters *sidcounter);
+	int (*qci_get_maxcap)(struct net_device *ndev,
+				struct tsn_qci_psfp_stream_param *qcicapa);
+	int (*qci_sfi_set)(struct net_device *ndev, u32 index, bool enable,
+				struct tsn_qci_psfp_sfi_conf *sficonf);
+	/* return: 0 stream filter instance not valid
+	 * 1 stream filter instance valid
+	 * -1 error happened
+	 */
+	int (*qci_sfi_get)(struct net_device *ndev, u32 index,
+				struct tsn_qci_psfp_sfi_conf *sficonf);
+	int (*qci_sfi_counters_get)(struct net_device *ndev, u32 index,
+				struct tsn_qci_psfp_sfi_counters *sficounter);
+	int (*qci_sgi_set)(struct net_device *ndev, u32 index,
+				struct tsn_qci_psfp_sgi_conf *sgiconf);
+	int (*qci_sgi_get)(struct net_device *ndev, u32 index,
+				struct tsn_qci_psfp_sgi_conf *sgiconf);
+	int (*qci_sgi_status_get)(struct net_device *ndev, u16 index,
+				struct tsn_psfp_sgi_status *sgistat);
+	int (*qci_fmi_set)(struct net_device *ndev, u32 index, bool enable,
+				struct tsn_qci_psfp_fmi *fmi);
+	int (*qci_fmi_get)(struct net_device *ndev, u32 index,
+				struct tsn_qci_psfp_fmi *fmi,
+				struct tsn_qci_psfp_fmi_counters *counters);
+	int (*cbs_set)(struct net_device *ndev, u8 tc, u8 bw);
+	int (*cbs_get)(struct net_device *ndev, u8 tc);
+	/* To set a 8 bits vector shows 8 traffic classes
+	 * preemtable(1) or express(0)
+	 */
+	int (*qbu_set)(struct net_device *ndev, u8 ptvector);
+	/* To get port preemtion status */
+	int (*qbu_get)(struct net_device *ndev,
+				struct tsn_preempt_status *preemptstat);
+	int (*tsd_set)(struct net_device *ndev, struct tsn_tsd *tsd);
+	int (*tsd_get)(struct net_device *ndev, struct tsn_tsd_status *stats);
+	int (*ct_set)(struct net_device *ndev, u8 cut_thru);
+	int (*cbgen_set)(struct net_device *ndev, u32 index,
+			 struct tsn_seq_gen_conf *seqgen);
+	int (*cbrec_set)(struct net_device *ndev, u32 index,
+			 struct tsn_seq_rec_conf *seqrec);
+	int (*cb_get)(struct net_device *ndev, u32 index,
+		      struct tsn_cb_status  *c);
+	int (*dscp_set)(struct net_device *ndev, bool enable,
+			const u8 dscp_ix,
+			struct tsn_qos_switch_dscp_conf *c);
+};
+
+enum ethdev_type {
+	TSN_SWITCH,
+	TSN_ENDPOINT,
+};
+
+#define GROUP_OFFSET_SWITCH 256
+
+struct tsn_port {
+	u16 groupid;
+	struct tsn_ops *tsnops;
+	struct net_device *netdev;
+	struct list_head list;
+	enum ethdev_type type;
+	u8 tc_nums;
+	struct tsn_notifier_info nd;
+};
+
+struct tsn_port *tsn_get_port(struct net_device *ndev);
+int register_tsn_notifier(struct notifier_block *nb);
+int unregister_tsn_notifier(struct notifier_block *nb);
+int call_tsn_notifiers(unsigned long val, struct net_device *dev,
+			     struct tsn_notifier_info *info);
+int tsn_port_register(struct net_device *netdev,
+				struct tsn_ops *tsnops, u16 groupid);
+void tsn_port_unregister(struct net_device *netdev);
+#endif

net/Kconfig

@@ -228,6 +228,7 @@ source "net/ieee802154/Kconfig"
 source "net/mac802154/Kconfig"
 source "net/sched/Kconfig"
 source "net/dcb/Kconfig"
+source "net/tsn/Kconfig"
 source "net/dns_resolver/Kconfig"
 source "net/batman-adv/Kconfig"
 source "net/openvswitch/Kconfig"

net/Makefile

@@ -59,6 +59,9 @@ obj-$(CONFIG_CAIF)		+= caif/
 ifneq ($(CONFIG_DCB),)
 obj-y				+= dcb/
 endif
+ifneq ($(CONFIG_TSN),)
+obj-y 				+= tsn/
+endif
 obj-$(CONFIG_6LOWPAN)		+= 6lowpan/
 obj-$(CONFIG_IEEE802154)	+= ieee802154/
 obj-$(CONFIG_MAC802154)		+= mac802154/

net/tsn/Kconfig

@@ -0,0 +1,15 @@
+config TSN
+	bool "802.1 Time-Sensitive Networking support"
+	default n
+	depends on VLAN_8021Q && PTP_1588_CLOCK
+	help
+	  This enables support for TSN(time sensitive networking)
+	  TSN features include:
+		802.1Qav:
+		802.1Qbv:
+		802.1Qci:
+		802.1Qbu:
+		802.1AS:
+		802.1CB:
+
+	  If unsure, say N.

net/tsn/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_TSN) += genl_tsn.o