Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...

[drm/drm-misc.git] / include / net / dsa.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips
 * Copyright (c) 2008-2009 Marvell Semiconductor
 */

#ifndef __LINUX_NET_DSA_H
#define __LINUX_NET_DSA_H

#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/of.h>
#include <linux/ethtool.h>
#include <linux/net_tstamp.h>
#include <linux/phy.h>
#include <linux/platform_data/dsa.h>
#include <linux/phylink.h>
#include <net/devlink.h>
#include <net/switchdev.h>

struct dsa_8021q_context;
struct tc_action;

#define DSA_TAG_PROTO_NONE_VALUE                0
#define DSA_TAG_PROTO_BRCM_VALUE                1
#define DSA_TAG_PROTO_BRCM_PREPEND_VALUE        2
#define DSA_TAG_PROTO_DSA_VALUE                 3
#define DSA_TAG_PROTO_EDSA_VALUE                4
#define DSA_TAG_PROTO_GSWIP_VALUE               5
#define DSA_TAG_PROTO_KSZ9477_VALUE             6
#define DSA_TAG_PROTO_KSZ9893_VALUE             7
#define DSA_TAG_PROTO_LAN9303_VALUE             8
#define DSA_TAG_PROTO_MTK_VALUE                 9
#define DSA_TAG_PROTO_QCA_VALUE                 10
#define DSA_TAG_PROTO_TRAILER_VALUE             11
#define DSA_TAG_PROTO_8021Q_VALUE               12
#define DSA_TAG_PROTO_SJA1105_VALUE             13
#define DSA_TAG_PROTO_KSZ8795_VALUE             14
#define DSA_TAG_PROTO_OCELOT_VALUE              15
#define DSA_TAG_PROTO_AR9331_VALUE              16
#define DSA_TAG_PROTO_RTL4_A_VALUE              17
#define DSA_TAG_PROTO_HELLCREEK_VALUE           18
#define DSA_TAG_PROTO_XRS700X_VALUE             19
#define DSA_TAG_PROTO_OCELOT_8021Q_VALUE        20
#define DSA_TAG_PROTO_SEVILLE_VALUE             21
#define DSA_TAG_PROTO_BRCM_LEGACY_VALUE         22
#define DSA_TAG_PROTO_SJA1110_VALUE             23
#define DSA_TAG_PROTO_RTL8_4_VALUE              24
#define DSA_TAG_PROTO_RTL8_4T_VALUE             25
#define DSA_TAG_PROTO_RZN1_A5PSW_VALUE          26
#define DSA_TAG_PROTO_LAN937X_VALUE             27
#define DSA_TAG_PROTO_VSC73XX_8021Q_VALUE       28

enum dsa_tag_protocol {
        DSA_TAG_PROTO_NONE              = DSA_TAG_PROTO_NONE_VALUE,
        DSA_TAG_PROTO_BRCM              = DSA_TAG_PROTO_BRCM_VALUE,
        DSA_TAG_PROTO_BRCM_LEGACY       = DSA_TAG_PROTO_BRCM_LEGACY_VALUE,
        DSA_TAG_PROTO_BRCM_PREPEND      = DSA_TAG_PROTO_BRCM_PREPEND_VALUE,
        DSA_TAG_PROTO_DSA               = DSA_TAG_PROTO_DSA_VALUE,
        DSA_TAG_PROTO_EDSA              = DSA_TAG_PROTO_EDSA_VALUE,
        DSA_TAG_PROTO_GSWIP             = DSA_TAG_PROTO_GSWIP_VALUE,
        DSA_TAG_PROTO_KSZ9477           = DSA_TAG_PROTO_KSZ9477_VALUE,
        DSA_TAG_PROTO_KSZ9893           = DSA_TAG_PROTO_KSZ9893_VALUE,
        DSA_TAG_PROTO_LAN9303           = DSA_TAG_PROTO_LAN9303_VALUE,
        DSA_TAG_PROTO_MTK               = DSA_TAG_PROTO_MTK_VALUE,
        DSA_TAG_PROTO_QCA               = DSA_TAG_PROTO_QCA_VALUE,
        DSA_TAG_PROTO_TRAILER           = DSA_TAG_PROTO_TRAILER_VALUE,
        DSA_TAG_PROTO_8021Q             = DSA_TAG_PROTO_8021Q_VALUE,
        DSA_TAG_PROTO_SJA1105           = DSA_TAG_PROTO_SJA1105_VALUE,
        DSA_TAG_PROTO_KSZ8795           = DSA_TAG_PROTO_KSZ8795_VALUE,
        DSA_TAG_PROTO_OCELOT            = DSA_TAG_PROTO_OCELOT_VALUE,
        DSA_TAG_PROTO_AR9331            = DSA_TAG_PROTO_AR9331_VALUE,
        DSA_TAG_PROTO_RTL4_A            = DSA_TAG_PROTO_RTL4_A_VALUE,
        DSA_TAG_PROTO_HELLCREEK         = DSA_TAG_PROTO_HELLCREEK_VALUE,
        DSA_TAG_PROTO_XRS700X           = DSA_TAG_PROTO_XRS700X_VALUE,
        DSA_TAG_PROTO_OCELOT_8021Q      = DSA_TAG_PROTO_OCELOT_8021Q_VALUE,
        DSA_TAG_PROTO_SEVILLE           = DSA_TAG_PROTO_SEVILLE_VALUE,
        DSA_TAG_PROTO_SJA1110           = DSA_TAG_PROTO_SJA1110_VALUE,
        DSA_TAG_PROTO_RTL8_4            = DSA_TAG_PROTO_RTL8_4_VALUE,
        DSA_TAG_PROTO_RTL8_4T           = DSA_TAG_PROTO_RTL8_4T_VALUE,
        DSA_TAG_PROTO_RZN1_A5PSW        = DSA_TAG_PROTO_RZN1_A5PSW_VALUE,
        DSA_TAG_PROTO_LAN937X           = DSA_TAG_PROTO_LAN937X_VALUE,
        DSA_TAG_PROTO_VSC73XX_8021Q     = DSA_TAG_PROTO_VSC73XX_8021Q_VALUE,
};

struct dsa_switch;

struct dsa_device_ops {
        struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
        struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev);
        void (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
                             int *offset);
        int (*connect)(struct dsa_switch *ds);
        void (*disconnect)(struct dsa_switch *ds);
        unsigned int needed_headroom;
        unsigned int needed_tailroom;
        const char *name;
        enum dsa_tag_protocol proto;
        /* Some tagging protocols either mangle or shift the destination MAC
         * address, in which case the DSA conduit would drop packets on ingress
         * if what it understands out of the destination MAC address is not in
         * its RX filter.
         */
        bool promisc_on_conduit;
};

struct dsa_lag {
        struct net_device *dev;
        unsigned int id;
        struct mutex fdb_lock;
        struct list_head fdbs;
        refcount_t refcount;
};

struct dsa_switch_tree {
        struct list_head        list;

        /* List of switch ports */
        struct list_head ports;

        /* Notifier chain for switch-wide events */
        struct raw_notifier_head        nh;

        /* Tree identifier */
        unsigned int index;

        /* Number of switches attached to this tree */
        struct kref refcount;

        /* Maps offloaded LAG netdevs to a zero-based linear ID for
         * drivers that need it.
         */
        struct dsa_lag **lags;

        /* Tagging protocol operations */
        const struct dsa_device_ops *tag_ops;

        /* Default tagging protocol preferred by the switches in this
         * tree.
         */
        enum dsa_tag_protocol default_proto;

        /* Has this tree been applied to the hardware? */
        bool setup;

        /*
         * Configuration data for the platform device that owns
         * this dsa switch tree instance.
         */
        struct dsa_platform_data        *pd;

        /* List of DSA links composing the routing table */
        struct list_head rtable;

        /* Length of "lags" array */
        unsigned int lags_len;

        /* Track the largest switch index within a tree */
        unsigned int last_switch;
};

/* LAG IDs are one-based, the dst->lags array is zero-based */
#define dsa_lags_foreach_id(_id, _dst)                          \
        for ((_id) = 1; (_id) <= (_dst)->lags_len; (_id)++)     \
                if ((_dst)->lags[(_id) - 1])

#define dsa_lag_foreach_port(_dp, _dst, _lag)                   \
        list_for_each_entry((_dp), &(_dst)->ports, list)        \
                if (dsa_port_offloads_lag((_dp), (_lag)))

#define dsa_hsr_foreach_port(_dp, _ds, _hsr)                    \
        list_for_each_entry((_dp), &(_ds)->dst->ports, list)    \
                if ((_dp)->ds == (_ds) && (_dp)->hsr_dev == (_hsr))

static inline struct dsa_lag *dsa_lag_by_id(struct dsa_switch_tree *dst,
                                            unsigned int id)
{
        /* DSA LAG IDs are one-based, dst->lags is zero-based */
        return dst->lags[id - 1];
}

static inline int dsa_lag_id(struct dsa_switch_tree *dst,
                             struct net_device *lag_dev)
{
        unsigned int id;

        dsa_lags_foreach_id(id, dst) {
                struct dsa_lag *lag = dsa_lag_by_id(dst, id);

                if (lag->dev == lag_dev)
                        return lag->id;
        }

        return -ENODEV;
}

/* TC matchall action types */
enum dsa_port_mall_action_type {
        DSA_PORT_MALL_MIRROR,
        DSA_PORT_MALL_POLICER,
};

/* TC mirroring entry */
struct dsa_mall_mirror_tc_entry {
        u8 to_local_port;
        bool ingress;
};

/* TC port policer entry */
struct dsa_mall_policer_tc_entry {
        u32 burst;
        u64 rate_bytes_per_sec;
};

/* TC matchall entry */
struct dsa_mall_tc_entry {
        struct list_head list;
        unsigned long cookie;
        enum dsa_port_mall_action_type type;
        union {
                struct dsa_mall_mirror_tc_entry mirror;
                struct dsa_mall_policer_tc_entry policer;
        };
};

struct dsa_bridge {
        struct net_device *dev;
        unsigned int num;
        bool tx_fwd_offload;
        refcount_t refcount;
};

struct dsa_port {
        /* A CPU port is physically connected to a conduit device. A user port
         * exposes a network device to user-space, called 'user' here.
         */
        union {
                struct net_device *conduit;
                struct net_device *user;
        };

        /* Copy of the tagging protocol operations, for quicker access
         * in the data path. Valid only for the CPU ports.
         */
        const struct dsa_device_ops *tag_ops;

        /* Copies for faster access in conduit receive hot path */
        struct dsa_switch_tree *dst;
        struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev);

        struct dsa_switch       *ds;

        unsigned int            index;

        enum {
                DSA_PORT_TYPE_UNUSED = 0,
                DSA_PORT_TYPE_CPU,
                DSA_PORT_TYPE_DSA,
                DSA_PORT_TYPE_USER,
        } type;

        const char              *name;
        struct dsa_port         *cpu_dp;
        u8                      mac[ETH_ALEN];

        u8                      stp_state;

        /* Warning: the following bit fields are not atomic, and updating them
         * can only be done from code paths where concurrency is not possible
         * (probe time or under rtnl_lock).
         */
        u8                      vlan_filtering:1;

        /* Managed by DSA on user ports and by drivers on CPU and DSA ports */
        u8                      learning:1;

        u8                      lag_tx_enabled:1;

        /* conduit state bits, valid only on CPU ports */
        u8                      conduit_admin_up:1;
        u8                      conduit_oper_up:1;

        /* Valid only on user ports */
        u8                      cpu_port_in_lag:1;

        u8                      setup:1;

        struct device_node      *dn;
        unsigned int            ageing_time;

        struct dsa_bridge       *bridge;
        struct devlink_port     devlink_port;
        struct phylink          *pl;
        struct phylink_config   pl_config;
        struct dsa_lag          *lag;
        struct net_device       *hsr_dev;

        struct list_head list;

        /*
         * Original copy of the conduit netdev ethtool_ops
         */
        const struct ethtool_ops *orig_ethtool_ops;

        /* List of MAC addresses that must be forwarded on this port.
         * These are only valid on CPU ports and DSA links.
         */
        struct mutex            addr_lists_lock;
        struct list_head        fdbs;
        struct list_head        mdbs;

        struct mutex            vlans_lock;
        union {
                /* List of VLANs that CPU and DSA ports are members of.
                 * Access to this is serialized by the sleepable @vlans_lock.
                 */
                struct list_head        vlans;
                /* List of VLANs that user ports are members of.
                 * Access to this is serialized by netif_addr_lock_bh().
                 */
                struct list_head        user_vlans;
        };
};

static inline struct dsa_port *
dsa_phylink_to_port(struct phylink_config *config)
{
        return container_of(config, struct dsa_port, pl_config);
}

/* TODO: ideally DSA ports would have a single dp->link_dp member,
 * and no dst->rtable nor this struct dsa_link would be needed,
 * but this would require some more complex tree walking,
 * so keep it stupid at the moment and list them all.
 */
struct dsa_link {
        struct dsa_port *dp;
        struct dsa_port *link_dp;
        struct list_head list;
};

enum dsa_db_type {
        DSA_DB_PORT,
        DSA_DB_LAG,
        DSA_DB_BRIDGE,
};

struct dsa_db {
        enum dsa_db_type type;

        union {
                const struct dsa_port *dp;
                struct dsa_lag lag;
                struct dsa_bridge bridge;
        };
};

struct dsa_mac_addr {
        unsigned char addr[ETH_ALEN];
        u16 vid;
        refcount_t refcount;
        struct list_head list;
        struct dsa_db db;
};

struct dsa_vlan {
        u16 vid;
        refcount_t refcount;
        struct list_head list;
};

struct dsa_switch {
        struct device *dev;

        /*
         * Parent switch tree, and switch index.
         */
        struct dsa_switch_tree  *dst;
        unsigned int            index;

        /* Warning: the following bit fields are not atomic, and updating them
         * can only be done from code paths where concurrency is not possible
         * (probe time or under rtnl_lock).
         */
        u32                     setup:1;

        /* Disallow bridge core from requesting different VLAN awareness
         * settings on ports if not hardware-supported
         */
        u32                     vlan_filtering_is_global:1;

        /* Keep VLAN filtering enabled on ports not offloading any upper */
        u32                     needs_standalone_vlan_filtering:1;

        /* Pass .port_vlan_add and .port_vlan_del to drivers even for bridges
         * that have vlan_filtering=0. All drivers should ideally set this (and
         * then the option would get removed), but it is unknown whether this
         * would break things or not.
         */
        u32                     configure_vlan_while_not_filtering:1;

        /* Pop the default_pvid of VLAN-unaware bridge ports from tagged frames.
         * DEPRECATED: Do NOT set this field in new drivers. Instead look at
         * the dsa_software_vlan_untag() comments.
         */
        u32                     untag_bridge_pvid:1;
        /* Pop the default_pvid of VLAN-aware bridge ports from tagged frames.
         * Useful if the switch cannot preserve the VLAN tag as seen on the
         * wire for user port ingress, and chooses to send all frames as
         * VLAN-tagged to the CPU, including those which were originally
         * untagged.
         */
        u32                     untag_vlan_aware_bridge_pvid:1;

        /* Let DSA manage the FDB entries towards the
         * CPU, based on the software bridge database.
         */
        u32                     assisted_learning_on_cpu_port:1;

        /* In case vlan_filtering_is_global is set, the VLAN awareness state
         * should be retrieved from here and not from the per-port settings.
         */
        u32                     vlan_filtering:1;

        /* For switches that only have the MRU configurable. To ensure the
         * configured MTU is not exceeded, normalization of MRU on all bridged
         * interfaces is needed.
         */
        u32                     mtu_enforcement_ingress:1;

        /* Drivers that isolate the FDBs of multiple bridges must set this
         * to true to receive the bridge as an argument in .port_fdb_{add,del}
         * and .port_mdb_{add,del}. Otherwise, the bridge.num will always be
         * passed as zero.
         */
        u32                     fdb_isolation:1;

        /* Drivers that have global DSCP mapping settings must set this to
         * true to automatically apply the settings to all ports.
         */
        u32                     dscp_prio_mapping_is_global:1;

        /* Listener for switch fabric events */
        struct notifier_block   nb;

        /*
         * Give the switch driver somewhere to hang its private data
         * structure.
         */
        void *priv;

        void *tagger_data;

        /*
         * Configuration data for this switch.
         */
        struct dsa_chip_data    *cd;

        /*
         * The switch operations.
         */
        const struct dsa_switch_ops     *ops;

        /*
         * Allow a DSA switch driver to override the phylink MAC ops
         */
        const struct phylink_mac_ops    *phylink_mac_ops;

        /*
         * User mii_bus and devices for the individual ports.
         */
        u32                     phys_mii_mask;
        struct mii_bus          *user_mii_bus;

        /* Ageing Time limits in msecs */
        unsigned int ageing_time_min;
        unsigned int ageing_time_max;

        /* Storage for drivers using tag_8021q */
        struct dsa_8021q_context *tag_8021q_ctx;

        /* devlink used to represent this switch device */
        struct devlink          *devlink;

        /* Number of switch port queues */
        unsigned int            num_tx_queues;

        /* Drivers that benefit from having an ID associated with each
         * offloaded LAG should set this to the maximum number of
         * supported IDs. DSA will then maintain a mapping of _at
         * least_ these many IDs, accessible to drivers via
         * dsa_lag_id().
         */
        unsigned int            num_lag_ids;

        /* Drivers that support bridge forwarding offload or FDB isolation
         * should set this to the maximum number of bridges spanning the same
         * switch tree (or all trees, in the case of cross-tree bridging
         * support) that can be offloaded.
         */
        unsigned int            max_num_bridges;

        unsigned int            num_ports;
};

static inline struct dsa_port *dsa_to_port(struct dsa_switch *ds, int p)
{
        struct dsa_switch_tree *dst = ds->dst;
        struct dsa_port *dp;

        list_for_each_entry(dp, &dst->ports, list)
                if (dp->ds == ds && dp->index == p)
                        return dp;

        return NULL;
}

static inline bool dsa_port_is_dsa(struct dsa_port *port)
{
        return port->type == DSA_PORT_TYPE_DSA;
}

static inline bool dsa_port_is_cpu(struct dsa_port *port)
{
        return port->type == DSA_PORT_TYPE_CPU;
}

static inline bool dsa_port_is_user(struct dsa_port *dp)
{
        return dp->type == DSA_PORT_TYPE_USER;
}

static inline bool dsa_port_is_unused(struct dsa_port *dp)
{
        return dp->type == DSA_PORT_TYPE_UNUSED;
}

static inline bool dsa_port_conduit_is_operational(struct dsa_port *dp)
{
        return dsa_port_is_cpu(dp) && dp->conduit_admin_up &&
               dp->conduit_oper_up;
}

static inline bool dsa_is_unused_port(struct dsa_switch *ds, int p)
{
        return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_UNUSED;
}

static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
{
        return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_CPU;
}

static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
{
        return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_DSA;
}

static inline bool dsa_is_user_port(struct dsa_switch *ds, int p)
{
        return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_USER;
}

#define dsa_tree_for_each_user_port(_dp, _dst) \
        list_for_each_entry((_dp), &(_dst)->ports, list) \
                if (dsa_port_is_user((_dp)))

#define dsa_tree_for_each_user_port_continue_reverse(_dp, _dst) \
        list_for_each_entry_continue_reverse((_dp), &(_dst)->ports, list) \
                if (dsa_port_is_user((_dp)))

#define dsa_tree_for_each_cpu_port(_dp, _dst) \
        list_for_each_entry((_dp), &(_dst)->ports, list) \
                if (dsa_port_is_cpu((_dp)))

#define dsa_switch_for_each_port(_dp, _ds) \
        list_for_each_entry((_dp), &(_ds)->dst->ports, list) \
                if ((_dp)->ds == (_ds))

#define dsa_switch_for_each_port_safe(_dp, _next, _ds) \
        list_for_each_entry_safe((_dp), (_next), &(_ds)->dst->ports, list) \
                if ((_dp)->ds == (_ds))

#define dsa_switch_for_each_port_continue_reverse(_dp, _ds) \
        list_for_each_entry_continue_reverse((_dp), &(_ds)->dst->ports, list) \
                if ((_dp)->ds == (_ds))

#define dsa_switch_for_each_available_port(_dp, _ds) \
        dsa_switch_for_each_port((_dp), (_ds)) \
                if (!dsa_port_is_unused((_dp)))

#define dsa_switch_for_each_user_port(_dp, _ds) \
        dsa_switch_for_each_port((_dp), (_ds)) \
                if (dsa_port_is_user((_dp)))

#define dsa_switch_for_each_user_port_continue_reverse(_dp, _ds) \
        dsa_switch_for_each_port_continue_reverse((_dp), (_ds)) \
                if (dsa_port_is_user((_dp)))

#define dsa_switch_for_each_cpu_port(_dp, _ds) \
        dsa_switch_for_each_port((_dp), (_ds)) \
                if (dsa_port_is_cpu((_dp)))

#define dsa_switch_for_each_cpu_port_continue_reverse(_dp, _ds) \
        dsa_switch_for_each_port_continue_reverse((_dp), (_ds)) \
                if (dsa_port_is_cpu((_dp)))

static inline u32 dsa_user_ports(struct dsa_switch *ds)
{
        struct dsa_port *dp;
        u32 mask = 0;

        dsa_switch_for_each_user_port(dp, ds)
                mask |= BIT(dp->index);

        return mask;
}

static inline u32 dsa_cpu_ports(struct dsa_switch *ds)
{
        struct dsa_port *cpu_dp;
        u32 mask = 0;

        dsa_switch_for_each_cpu_port(cpu_dp, ds)
                mask |= BIT(cpu_dp->index);

        return mask;
}

/* Return the local port used to reach an arbitrary switch device */
static inline unsigned int dsa_routing_port(struct dsa_switch *ds, int device)
{
        struct dsa_switch_tree *dst = ds->dst;
        struct dsa_link *dl;

        list_for_each_entry(dl, &dst->rtable, list)
                if (dl->dp->ds == ds && dl->link_dp->ds->index == device)
                        return dl->dp->index;

        return ds->num_ports;
}

/* Return the local port used to reach an arbitrary switch port */
static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,
                                            int port)
{
        if (device == ds->index)
                return port;
        else
                return dsa_routing_port(ds, device);
}

/* Return the local port used to reach the dedicated CPU port */
static inline unsigned int dsa_upstream_port(struct dsa_switch *ds, int port)
{
        const struct dsa_port *dp = dsa_to_port(ds, port);
        const struct dsa_port *cpu_dp = dp->cpu_dp;

        if (!cpu_dp)
                return port;

        return dsa_towards_port(ds, cpu_dp->ds->index, cpu_dp->index);
}

/* Return true if this is the local port used to reach the CPU port */
static inline bool dsa_is_upstream_port(struct dsa_switch *ds, int port)
{
        if (dsa_is_unused_port(ds, port))
                return false;

        return port == dsa_upstream_port(ds, port);
}

/* Return true if this is a DSA port leading away from the CPU */
static inline bool dsa_is_downstream_port(struct dsa_switch *ds, int port)
{
        return dsa_is_dsa_port(ds, port) && !dsa_is_upstream_port(ds, port);
}

/* Return the local port used to reach the CPU port */
static inline unsigned int dsa_switch_upstream_port(struct dsa_switch *ds)
{
        struct dsa_port *dp;

        dsa_switch_for_each_available_port(dp, ds) {
                return dsa_upstream_port(ds, dp->index);
        }

        return ds->num_ports;
}

/* Return true if @upstream_ds is an upstream switch of @downstream_ds, meaning
 * that the routing port from @downstream_ds to @upstream_ds is also the port
 * which @downstream_ds uses to reach its dedicated CPU.
 */
static inline bool dsa_switch_is_upstream_of(struct dsa_switch *upstream_ds,
                                             struct dsa_switch *downstream_ds)
{
        int routing_port;

        if (upstream_ds == downstream_ds)
                return true;

        routing_port = dsa_routing_port(downstream_ds, upstream_ds->index);

        return dsa_is_upstream_port(downstream_ds, routing_port);
}

static inline bool dsa_port_is_vlan_filtering(const struct dsa_port *dp)
{
        const struct dsa_switch *ds = dp->ds;

        if (ds->vlan_filtering_is_global)
                return ds->vlan_filtering;
        else
                return dp->vlan_filtering;
}

static inline unsigned int dsa_port_lag_id_get(struct dsa_port *dp)
{
        return dp->lag ? dp->lag->id : 0;
}

static inline struct net_device *dsa_port_lag_dev_get(struct dsa_port *dp)
{
        return dp->lag ? dp->lag->dev : NULL;
}

static inline bool dsa_port_offloads_lag(struct dsa_port *dp,
                                         const struct dsa_lag *lag)
{
        return dsa_port_lag_dev_get(dp) == lag->dev;
}

static inline struct net_device *dsa_port_to_conduit(const struct dsa_port *dp)
{
        if (dp->cpu_port_in_lag)
                return dsa_port_lag_dev_get(dp->cpu_dp);

        return dp->cpu_dp->conduit;
}

static inline
struct net_device *dsa_port_to_bridge_port(const struct dsa_port *dp)
{
        if (!dp->bridge)
                return NULL;

        if (dp->lag)
                return dp->lag->dev;
        else if (dp->hsr_dev)
                return dp->hsr_dev;

        return dp->user;
}

static inline struct net_device *
dsa_port_bridge_dev_get(const struct dsa_port *dp)
{
        return dp->bridge ? dp->bridge->dev : NULL;
}

static inline unsigned int dsa_port_bridge_num_get(struct dsa_port *dp)
{
        return dp->bridge ? dp->bridge->num : 0;
}

static inline bool dsa_port_bridge_same(const struct dsa_port *a,
                                        const struct dsa_port *b)
{
        struct net_device *br_a = dsa_port_bridge_dev_get(a);
        struct net_device *br_b = dsa_port_bridge_dev_get(b);

        /* Standalone ports are not in the same bridge with one another */
        return (!br_a || !br_b) ? false : (br_a == br_b);
}

static inline bool dsa_port_offloads_bridge_port(struct dsa_port *dp,
                                                 const struct net_device *dev)
{
        return dsa_port_to_bridge_port(dp) == dev;
}

static inline bool
dsa_port_offloads_bridge_dev(struct dsa_port *dp,
                             const struct net_device *bridge_dev)
{
        /* DSA ports connected to a bridge, and event was emitted
         * for the bridge.
         */
        return dsa_port_bridge_dev_get(dp) == bridge_dev;
}

static inline bool dsa_port_offloads_bridge(struct dsa_port *dp,
                                            const struct dsa_bridge *bridge)
{
        return dsa_port_bridge_dev_get(dp) == bridge->dev;
}

/* Returns true if any port of this tree offloads the given net_device */
static inline bool dsa_tree_offloads_bridge_port(struct dsa_switch_tree *dst,
                                                 const struct net_device *dev)
{
        struct dsa_port *dp;

        list_for_each_entry(dp, &dst->ports, list)
                if (dsa_port_offloads_bridge_port(dp, dev))
                        return true;

        return false;
}

/* Returns true if any port of this tree offloads the given bridge */
static inline bool
dsa_tree_offloads_bridge_dev(struct dsa_switch_tree *dst,
                             const struct net_device *bridge_dev)
{
        struct dsa_port *dp;

        list_for_each_entry(dp, &dst->ports, list)
                if (dsa_port_offloads_bridge_dev(dp, bridge_dev))
                        return true;

        return false;
}

static inline bool dsa_port_tree_same(const struct dsa_port *a,
                                      const struct dsa_port *b)
{
        return a->ds->dst == b->ds->dst;
}

typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
                              bool is_static, void *data);
struct dsa_switch_ops {
        /*
         * Tagging protocol helpers called for the CPU ports and DSA links.
         * @get_tag_protocol retrieves the initial tagging protocol and is
         * mandatory. Switches which can operate using multiple tagging
         * protocols should implement @change_tag_protocol and report in
         * @get_tag_protocol the tagger in current use.
         */
        enum dsa_tag_protocol (*get_tag_protocol)(struct dsa_switch *ds,
                                                  int port,
                                                  enum dsa_tag_protocol mprot);
        int     (*change_tag_protocol)(struct dsa_switch *ds,
                                       enum dsa_tag_protocol proto);
        /*
         * Method for switch drivers to connect to the tagging protocol driver
         * in current use. The switch driver can provide handlers for certain
         * types of packets for switch management.
         */
        int     (*connect_tag_protocol)(struct dsa_switch *ds,
                                        enum dsa_tag_protocol proto);

        int     (*port_change_conduit)(struct dsa_switch *ds, int port,
                                       struct net_device *conduit,
                                       struct netlink_ext_ack *extack);

        /* Optional switch-wide initialization and destruction methods */
        int     (*setup)(struct dsa_switch *ds);
        void    (*teardown)(struct dsa_switch *ds);

        /* Per-port initialization and destruction methods. Mandatory if the
         * driver registers devlink port regions, optional otherwise.
         */
        int     (*port_setup)(struct dsa_switch *ds, int port);
        void    (*port_teardown)(struct dsa_switch *ds, int port);

        u32     (*get_phy_flags)(struct dsa_switch *ds, int port);

        /*
         * Access to the switch's PHY registers.
         */
        int     (*phy_read)(struct dsa_switch *ds, int port, int regnum);
        int     (*phy_write)(struct dsa_switch *ds, int port,
                             int regnum, u16 val);

        /*
         * PHYLINK integration
         */
        void    (*phylink_get_caps)(struct dsa_switch *ds, int port,
                                    struct phylink_config *config);
        void    (*phylink_fixed_state)(struct dsa_switch *ds, int port,
                                       struct phylink_link_state *state);
        /*
         * Port statistics counters.
         */
        void    (*get_strings)(struct dsa_switch *ds, int port,
                               u32 stringset, uint8_t *data);
        void    (*get_ethtool_stats)(struct dsa_switch *ds,
                                     int port, uint64_t *data);
        int     (*get_sset_count)(struct dsa_switch *ds, int port, int sset);
        void    (*get_ethtool_phy_stats)(struct dsa_switch *ds,
                                         int port, uint64_t *data);
        void    (*get_eth_phy_stats)(struct dsa_switch *ds, int port,
                                     struct ethtool_eth_phy_stats *phy_stats);
        void    (*get_eth_mac_stats)(struct dsa_switch *ds, int port,
                                     struct ethtool_eth_mac_stats *mac_stats);
        void    (*get_eth_ctrl_stats)(struct dsa_switch *ds, int port,
                                      struct ethtool_eth_ctrl_stats *ctrl_stats);
        void    (*get_rmon_stats)(struct dsa_switch *ds, int port,
                                  struct ethtool_rmon_stats *rmon_stats,
                                  const struct ethtool_rmon_hist_range **ranges);
        void    (*get_stats64)(struct dsa_switch *ds, int port,
                                   struct rtnl_link_stats64 *s);
        void    (*get_pause_stats)(struct dsa_switch *ds, int port,
                                   struct ethtool_pause_stats *pause_stats);
        void    (*self_test)(struct dsa_switch *ds, int port,
                             struct ethtool_test *etest, u64 *data);

        /*
         * ethtool Wake-on-LAN
         */
        void    (*get_wol)(struct dsa_switch *ds, int port,
                           struct ethtool_wolinfo *w);
        int     (*set_wol)(struct dsa_switch *ds, int port,
                           struct ethtool_wolinfo *w);

        /*
         * ethtool timestamp info
         */
        int     (*get_ts_info)(struct dsa_switch *ds, int port,
                               struct kernel_ethtool_ts_info *ts);

        /*
         * ethtool MAC merge layer
         */
        int     (*get_mm)(struct dsa_switch *ds, int port,
                          struct ethtool_mm_state *state);
        int     (*set_mm)(struct dsa_switch *ds, int port,
                          struct ethtool_mm_cfg *cfg,
                          struct netlink_ext_ack *extack);
        void    (*get_mm_stats)(struct dsa_switch *ds, int port,
                                struct ethtool_mm_stats *stats);

        /*
         * DCB ops
         */
        int     (*port_get_default_prio)(struct dsa_switch *ds, int port);
        int     (*port_set_default_prio)(struct dsa_switch *ds, int port,
                                         u8 prio);
        int     (*port_get_dscp_prio)(struct dsa_switch *ds, int port, u8 dscp);
        int     (*port_add_dscp_prio)(struct dsa_switch *ds, int port, u8 dscp,
                                      u8 prio);
        int     (*port_del_dscp_prio)(struct dsa_switch *ds, int port, u8 dscp,
                                      u8 prio);
        int     (*port_set_apptrust)(struct dsa_switch *ds, int port,
                                     const u8 *sel, int nsel);
        int     (*port_get_apptrust)(struct dsa_switch *ds, int port, u8 *sel,
                                     int *nsel);

        /*
         * Suspend and resume
         */
        int     (*suspend)(struct dsa_switch *ds);
        int     (*resume)(struct dsa_switch *ds);

        /*
         * Port enable/disable
         */
        int     (*port_enable)(struct dsa_switch *ds, int port,
                               struct phy_device *phy);
        void    (*port_disable)(struct dsa_switch *ds, int port);


        /*
         * Notification for MAC address changes on user ports. Drivers can
         * currently only veto operations. They should not use the method to
         * program the hardware, since the operation is not rolled back in case
         * of other errors.
         */
        int     (*port_set_mac_address)(struct dsa_switch *ds, int port,
                                        const unsigned char *addr);

        /*
         * Compatibility between device trees defining multiple CPU ports and
         * drivers which are not OK to use by default the numerically smallest
         * CPU port of a switch for its local ports. This can return NULL,
         * meaning "don't know/don't care".
         */
        struct dsa_port *(*preferred_default_local_cpu_port)(struct dsa_switch *ds);

        /*
         * Port's MAC EEE settings
         */
        int     (*set_mac_eee)(struct dsa_switch *ds, int port,
                               struct ethtool_keee *e);
        int     (*get_mac_eee)(struct dsa_switch *ds, int port,
                               struct ethtool_keee *e);

        /* EEPROM access */
        int     (*get_eeprom_len)(struct dsa_switch *ds);
        int     (*get_eeprom)(struct dsa_switch *ds,
                              struct ethtool_eeprom *eeprom, u8 *data);
        int     (*set_eeprom)(struct dsa_switch *ds,
                              struct ethtool_eeprom *eeprom, u8 *data);

        /*
         * Register access.
         */
        int     (*get_regs_len)(struct dsa_switch *ds, int port);
        void    (*get_regs)(struct dsa_switch *ds, int port,
                            struct ethtool_regs *regs, void *p);

        /*
         * Upper device tracking.
         */
        int     (*port_prechangeupper)(struct dsa_switch *ds, int port,
                                       struct netdev_notifier_changeupper_info *info);

        /*
         * Bridge integration
         */
        int     (*set_ageing_time)(struct dsa_switch *ds, unsigned int msecs);
        int     (*port_bridge_join)(struct dsa_switch *ds, int port,
                                    struct dsa_bridge bridge,
                                    bool *tx_fwd_offload,
                                    struct netlink_ext_ack *extack);
        void    (*port_bridge_leave)(struct dsa_switch *ds, int port,
                                     struct dsa_bridge bridge);
        void    (*port_stp_state_set)(struct dsa_switch *ds, int port,
                                      u8 state);
        int     (*port_mst_state_set)(struct dsa_switch *ds, int port,
                                      const struct switchdev_mst_state *state);
        void    (*port_fast_age)(struct dsa_switch *ds, int port);
        int     (*port_vlan_fast_age)(struct dsa_switch *ds, int port, u16 vid);
        int     (*port_pre_bridge_flags)(struct dsa_switch *ds, int port,
                                         struct switchdev_brport_flags flags,
                                         struct netlink_ext_ack *extack);
        int     (*port_bridge_flags)(struct dsa_switch *ds, int port,
                                     struct switchdev_brport_flags flags,
                                     struct netlink_ext_ack *extack);
        void    (*port_set_host_flood)(struct dsa_switch *ds, int port,
                                       bool uc, bool mc);

        /*
         * VLAN support
         */
        int     (*port_vlan_filtering)(struct dsa_switch *ds, int port,
                                       bool vlan_filtering,
                                       struct netlink_ext_ack *extack);
        int     (*port_vlan_add)(struct dsa_switch *ds, int port,
                                 const struct switchdev_obj_port_vlan *vlan,
                                 struct netlink_ext_ack *extack);
        int     (*port_vlan_del)(struct dsa_switch *ds, int port,
                                 const struct switchdev_obj_port_vlan *vlan);
        int     (*vlan_msti_set)(struct dsa_switch *ds, struct dsa_bridge bridge,
                                 const struct switchdev_vlan_msti *msti);

        /*
         * Forwarding database
         */
        int     (*port_fdb_add)(struct dsa_switch *ds, int port,
                                const unsigned char *addr, u16 vid,
                                struct dsa_db db);
        int     (*port_fdb_del)(struct dsa_switch *ds, int port,
                                const unsigned char *addr, u16 vid,
                                struct dsa_db db);
        int     (*port_fdb_dump)(struct dsa_switch *ds, int port,
                                 dsa_fdb_dump_cb_t *cb, void *data);
        int     (*lag_fdb_add)(struct dsa_switch *ds, struct dsa_lag lag,
                               const unsigned char *addr, u16 vid,
                               struct dsa_db db);
        int     (*lag_fdb_del)(struct dsa_switch *ds, struct dsa_lag lag,
                               const unsigned char *addr, u16 vid,
                               struct dsa_db db);

        /*
         * Multicast database
         */
        int     (*port_mdb_add)(struct dsa_switch *ds, int port,
                                const struct switchdev_obj_port_mdb *mdb,
                                struct dsa_db db);
        int     (*port_mdb_del)(struct dsa_switch *ds, int port,
                                const struct switchdev_obj_port_mdb *mdb,
                                struct dsa_db db);
        /*
         * RXNFC
         */
        int     (*get_rxnfc)(struct dsa_switch *ds, int port,
                             struct ethtool_rxnfc *nfc, u32 *rule_locs);
        int     (*set_rxnfc)(struct dsa_switch *ds, int port,
                             struct ethtool_rxnfc *nfc);

        /*
         * TC integration
         */
        int     (*cls_flower_add)(struct dsa_switch *ds, int port,
                                  struct flow_cls_offload *cls, bool ingress);
        int     (*cls_flower_del)(struct dsa_switch *ds, int port,
                                  struct flow_cls_offload *cls, bool ingress);
        int     (*cls_flower_stats)(struct dsa_switch *ds, int port,
                                    struct flow_cls_offload *cls, bool ingress);
        int     (*port_mirror_add)(struct dsa_switch *ds, int port,
                                   struct dsa_mall_mirror_tc_entry *mirror,
                                   bool ingress, struct netlink_ext_ack *extack);
        void    (*port_mirror_del)(struct dsa_switch *ds, int port,
                                   struct dsa_mall_mirror_tc_entry *mirror);
        int     (*port_policer_add)(struct dsa_switch *ds, int port,
                                    struct dsa_mall_policer_tc_entry *policer);
        void    (*port_policer_del)(struct dsa_switch *ds, int port);
        int     (*port_setup_tc)(struct dsa_switch *ds, int port,
                                 enum tc_setup_type type, void *type_data);

        /*
         * Cross-chip operations
         */
        int     (*crosschip_bridge_join)(struct dsa_switch *ds, int tree_index,
                                         int sw_index, int port,
                                         struct dsa_bridge bridge,
                                         struct netlink_ext_ack *extack);
        void    (*crosschip_bridge_leave)(struct dsa_switch *ds, int tree_index,
                                          int sw_index, int port,
                                          struct dsa_bridge bridge);
        int     (*crosschip_lag_change)(struct dsa_switch *ds, int sw_index,
                                        int port);
        int     (*crosschip_lag_join)(struct dsa_switch *ds, int sw_index,
                                      int port, struct dsa_lag lag,
                                      struct netdev_lag_upper_info *info,
                                      struct netlink_ext_ack *extack);
        int     (*crosschip_lag_leave)(struct dsa_switch *ds, int sw_index,
                                       int port, struct dsa_lag lag);

        /*
         * PTP functionality
         */
        int     (*port_hwtstamp_get)(struct dsa_switch *ds, int port,
                                     struct ifreq *ifr);
        int     (*port_hwtstamp_set)(struct dsa_switch *ds, int port,
                                     struct ifreq *ifr);
        void    (*port_txtstamp)(struct dsa_switch *ds, int port,
                                 struct sk_buff *skb);
        bool    (*port_rxtstamp)(struct dsa_switch *ds, int port,
                                 struct sk_buff *skb, unsigned int type);

        /* Devlink parameters, etc */
        int     (*devlink_param_get)(struct dsa_switch *ds, u32 id,
                                     struct devlink_param_gset_ctx *ctx);
        int     (*devlink_param_set)(struct dsa_switch *ds, u32 id,
                                     struct devlink_param_gset_ctx *ctx);
        int     (*devlink_info_get)(struct dsa_switch *ds,
                                    struct devlink_info_req *req,
                                    struct netlink_ext_ack *extack);
        int     (*devlink_sb_pool_get)(struct dsa_switch *ds,
                                       unsigned int sb_index, u16 pool_index,
                                       struct devlink_sb_pool_info *pool_info);
        int     (*devlink_sb_pool_set)(struct dsa_switch *ds, unsigned int sb_index,
                                       u16 pool_index, u32 size,
                                       enum devlink_sb_threshold_type threshold_type,
                                       struct netlink_ext_ack *extack);
        int     (*devlink_sb_port_pool_get)(struct dsa_switch *ds, int port,
                                            unsigned int sb_index, u16 pool_index,
                                            u32 *p_threshold);
        int     (*devlink_sb_port_pool_set)(struct dsa_switch *ds, int port,
                                            unsigned int sb_index, u16 pool_index,
                                            u32 threshold,
                                            struct netlink_ext_ack *extack);
        int     (*devlink_sb_tc_pool_bind_get)(struct dsa_switch *ds, int port,
                                               unsigned int sb_index, u16 tc_index,
                                               enum devlink_sb_pool_type pool_type,
                                               u16 *p_pool_index, u32 *p_threshold);
        int     (*devlink_sb_tc_pool_bind_set)(struct dsa_switch *ds, int port,
                                               unsigned int sb_index, u16 tc_index,
                                               enum devlink_sb_pool_type pool_type,
                                               u16 pool_index, u32 threshold,
                                               struct netlink_ext_ack *extack);
        int     (*devlink_sb_occ_snapshot)(struct dsa_switch *ds,
                                           unsigned int sb_index);
        int     (*devlink_sb_occ_max_clear)(struct dsa_switch *ds,
                                            unsigned int sb_index);
        int     (*devlink_sb_occ_port_pool_get)(struct dsa_switch *ds, int port,
                                                unsigned int sb_index, u16 pool_index,
                                                u32 *p_cur, u32 *p_max);
        int     (*devlink_sb_occ_tc_port_bind_get)(struct dsa_switch *ds, int port,
                                                   unsigned int sb_index, u16 tc_index,
                                                   enum devlink_sb_pool_type pool_type,
                                                   u32 *p_cur, u32 *p_max);

        /*
         * MTU change functionality. Switches can also adjust their MRU through
         * this method. By MTU, one understands the SDU (L2 payload) length.
         * If the switch needs to account for the DSA tag on the CPU port, this
         * method needs to do so privately.
         */
        int     (*port_change_mtu)(struct dsa_switch *ds, int port,
                                   int new_mtu);
        int     (*port_max_mtu)(struct dsa_switch *ds, int port);

        /*
         * LAG integration
         */
        int     (*port_lag_change)(struct dsa_switch *ds, int port);
        int     (*port_lag_join)(struct dsa_switch *ds, int port,
                                 struct dsa_lag lag,
                                 struct netdev_lag_upper_info *info,
                                 struct netlink_ext_ack *extack);
        int     (*port_lag_leave)(struct dsa_switch *ds, int port,
                                  struct dsa_lag lag);

        /*
         * HSR integration
         */
        int     (*port_hsr_join)(struct dsa_switch *ds, int port,
                                 struct net_device *hsr,
                                 struct netlink_ext_ack *extack);
        int     (*port_hsr_leave)(struct dsa_switch *ds, int port,
                                  struct net_device *hsr);

        /*
         * MRP integration
         */
        int     (*port_mrp_add)(struct dsa_switch *ds, int port,
                                const struct switchdev_obj_mrp *mrp);
        int     (*port_mrp_del)(struct dsa_switch *ds, int port,
                                const struct switchdev_obj_mrp *mrp);
        int     (*port_mrp_add_ring_role)(struct dsa_switch *ds, int port,
                                          const struct switchdev_obj_ring_role_mrp *mrp);
        int     (*port_mrp_del_ring_role)(struct dsa_switch *ds, int port,
                                          const struct switchdev_obj_ring_role_mrp *mrp);

        /*
         * tag_8021q operations
         */
        int     (*tag_8021q_vlan_add)(struct dsa_switch *ds, int port, u16 vid,
                                      u16 flags);
        int     (*tag_8021q_vlan_del)(struct dsa_switch *ds, int port, u16 vid);

        /*
         * DSA conduit tracking operations
         */
        void    (*conduit_state_change)(struct dsa_switch *ds,
                                        const struct net_device *conduit,
                                        bool operational);
};

#define DSA_DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes)            \
        DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes,                \
                             dsa_devlink_param_get, dsa_devlink_param_set, NULL)

int dsa_devlink_param_get(struct devlink *dl, u32 id,
                          struct devlink_param_gset_ctx *ctx);
int dsa_devlink_param_set(struct devlink *dl, u32 id,
                          struct devlink_param_gset_ctx *ctx,
                          struct netlink_ext_ack *extack);
int dsa_devlink_params_register(struct dsa_switch *ds,
                                const struct devlink_param *params,
                                size_t params_count);
void dsa_devlink_params_unregister(struct dsa_switch *ds,
                                   const struct devlink_param *params,
                                   size_t params_count);
int dsa_devlink_resource_register(struct dsa_switch *ds,
                                  const char *resource_name,
                                  u64 resource_size,
                                  u64 resource_id,
                                  u64 parent_resource_id,
                                  const struct devlink_resource_size_params *size_params);

void dsa_devlink_resources_unregister(struct dsa_switch *ds);

void dsa_devlink_resource_occ_get_register(struct dsa_switch *ds,
                                           u64 resource_id,
                                           devlink_resource_occ_get_t *occ_get,
                                           void *occ_get_priv);
void dsa_devlink_resource_occ_get_unregister(struct dsa_switch *ds,
                                             u64 resource_id);
struct devlink_region *
dsa_devlink_region_create(struct dsa_switch *ds,
                          const struct devlink_region_ops *ops,
                          u32 region_max_snapshots, u64 region_size);
struct devlink_region *
dsa_devlink_port_region_create(struct dsa_switch *ds,
                               int port,
                               const struct devlink_port_region_ops *ops,
                               u32 region_max_snapshots, u64 region_size);
void dsa_devlink_region_destroy(struct devlink_region *region);

struct dsa_port *dsa_port_from_netdev(struct net_device *netdev);

struct dsa_devlink_priv {
        struct dsa_switch *ds;
};

static inline struct dsa_switch *dsa_devlink_to_ds(struct devlink *dl)
{
        struct dsa_devlink_priv *dl_priv = devlink_priv(dl);

        return dl_priv->ds;
}

static inline
struct dsa_switch *dsa_devlink_port_to_ds(struct devlink_port *port)
{
        struct devlink *dl = port->devlink;
        struct dsa_devlink_priv *dl_priv = devlink_priv(dl);

        return dl_priv->ds;
}

static inline int dsa_devlink_port_to_port(struct devlink_port *port)
{
        return port->index;
}

struct dsa_switch_driver {
        struct list_head        list;
        const struct dsa_switch_ops *ops;
};

bool dsa_fdb_present_in_other_db(struct dsa_switch *ds, int port,
                                 const unsigned char *addr, u16 vid,
                                 struct dsa_db db);
bool dsa_mdb_present_in_other_db(struct dsa_switch *ds, int port,
                                 const struct switchdev_obj_port_mdb *mdb,
                                 struct dsa_db db);

/* Keep inline for faster access in hot path */
static inline bool netdev_uses_dsa(const struct net_device *dev)
{
#if IS_ENABLED(CONFIG_NET_DSA)
        return dev->dsa_ptr && dev->dsa_ptr->rcv;
#endif
        return false;
}

/* All DSA tags that push the EtherType to the right (basically all except tail
 * tags, which don't break dissection) can be treated the same from the
 * perspective of the flow dissector.
 *
 * We need to return:
 *  - offset: the (B - A) difference between:
 *    A. the position of the real EtherType and
 *    B. the current skb->data (aka ETH_HLEN bytes into the frame, aka 2 bytes
 *       after the normal EtherType was supposed to be)
 *    The offset in bytes is exactly equal to the tagger overhead (and half of
 *    that, in __be16 shorts).
 *
 *  - proto: the value of the real EtherType.
 */
static inline void dsa_tag_generic_flow_dissect(const struct sk_buff *skb,
                                                __be16 *proto, int *offset)
{
#if IS_ENABLED(CONFIG_NET_DSA)
        const struct dsa_device_ops *ops = skb->dev->dsa_ptr->tag_ops;
        int tag_len = ops->needed_headroom;

        *offset = tag_len;
        *proto = ((__be16 *)skb->data)[(tag_len / 2) - 1];
#endif
}

void dsa_unregister_switch(struct dsa_switch *ds);
int dsa_register_switch(struct dsa_switch *ds);
void dsa_switch_shutdown(struct dsa_switch *ds);
struct dsa_switch *dsa_switch_find(int tree_index, int sw_index);
void dsa_flush_workqueue(void);
#ifdef CONFIG_PM_SLEEP
int dsa_switch_suspend(struct dsa_switch *ds);
int dsa_switch_resume(struct dsa_switch *ds);
#else
static inline int dsa_switch_suspend(struct dsa_switch *ds)
{
        return 0;
}
static inline int dsa_switch_resume(struct dsa_switch *ds)
{
        return 0;
}
#endif /* CONFIG_PM_SLEEP */

#if IS_ENABLED(CONFIG_NET_DSA)
bool dsa_user_dev_check(const struct net_device *dev);
#else
static inline bool dsa_user_dev_check(const struct net_device *dev)
{
        return false;
}
#endif

netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev);
void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up);

#endif