Input: wm97xx: add new AC97 bus support

[mirror_ubuntu-focal-kernel.git] / drivers / net / ethernet / mellanox / mlxsw / core.c

/*
 * drivers/net/ethernet/mellanox/mlxsw/core.c
 * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2015 Jiri Pirko <jiri@mellanox.com>
 * Copyright (c) 2015 Ido Schimmel <idosch@mellanox.com>
 * Copyright (c) 2015 Elad Raz <eladr@mellanox.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/if_link.h>
#include <linux/netdevice.h>
#include <linux/completion.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/gfp.h>
#include <linux/random.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <asm/byteorder.h>
#include <net/devlink.h>
#include <trace/events/devlink.h>

#include "core.h"
#include "item.h"
#include "cmd.h"
#include "port.h"
#include "trap.h"
#include "emad.h"
#include "reg.h"
#include "resources.h"

static LIST_HEAD(mlxsw_core_driver_list);
static DEFINE_SPINLOCK(mlxsw_core_driver_list_lock);

static const char mlxsw_core_driver_name[] = "mlxsw_core";

static struct workqueue_struct *mlxsw_wq;
static struct workqueue_struct *mlxsw_owq;

struct mlxsw_core_port {
        struct devlink_port devlink_port;
        void *port_driver_priv;
        u8 local_port;
};

void *mlxsw_core_port_driver_priv(struct mlxsw_core_port *mlxsw_core_port)
{
        return mlxsw_core_port->port_driver_priv;
}
EXPORT_SYMBOL(mlxsw_core_port_driver_priv);

static bool mlxsw_core_port_check(struct mlxsw_core_port *mlxsw_core_port)
{
        return mlxsw_core_port->port_driver_priv != NULL;
}

struct mlxsw_core {
        struct mlxsw_driver *driver;
        const struct mlxsw_bus *bus;
        void *bus_priv;
        const struct mlxsw_bus_info *bus_info;
        struct list_head rx_listener_list;
        struct list_head event_listener_list;
        struct {
                atomic64_t tid;
                struct list_head trans_list;
                spinlock_t trans_list_lock; /* protects trans_list writes */
                bool use_emad;
        } emad;
        struct {
                u8 *mapping; /* lag_id+port_index to local_port mapping */
        } lag;
        struct mlxsw_res res;
        struct mlxsw_hwmon *hwmon;
        struct mlxsw_thermal *thermal;
        struct mlxsw_core_port *ports;
        unsigned int max_ports;
        unsigned long driver_priv[0];
        /* driver_priv has to be always the last item */
};

#define MLXSW_PORT_MAX_PORTS_DEFAULT    0x40

static int mlxsw_ports_init(struct mlxsw_core *mlxsw_core)
{
        /* Switch ports are numbered from 1 to queried value */
        if (MLXSW_CORE_RES_VALID(mlxsw_core, MAX_SYSTEM_PORT))
                mlxsw_core->max_ports = MLXSW_CORE_RES_GET(mlxsw_core,
                                                           MAX_SYSTEM_PORT) + 1;
        else
                mlxsw_core->max_ports = MLXSW_PORT_MAX_PORTS_DEFAULT + 1;

        mlxsw_core->ports = kcalloc(mlxsw_core->max_ports,
                                    sizeof(struct mlxsw_core_port), GFP_KERNEL);
        if (!mlxsw_core->ports)
                return -ENOMEM;

        return 0;
}

static void mlxsw_ports_fini(struct mlxsw_core *mlxsw_core)
{
        kfree(mlxsw_core->ports);
}

unsigned int mlxsw_core_max_ports(const struct mlxsw_core *mlxsw_core)
{
        return mlxsw_core->max_ports;
}
EXPORT_SYMBOL(mlxsw_core_max_ports);

void *mlxsw_core_driver_priv(struct mlxsw_core *mlxsw_core)
{
        return mlxsw_core->driver_priv;
}
EXPORT_SYMBOL(mlxsw_core_driver_priv);

struct mlxsw_rx_listener_item {
        struct list_head list;
        struct mlxsw_rx_listener rxl;
        void *priv;
};

struct mlxsw_event_listener_item {
        struct list_head list;
        struct mlxsw_event_listener el;
        void *priv;
};

/******************
 * EMAD processing
 ******************/

/* emad_eth_hdr_dmac
 * Destination MAC in EMAD's Ethernet header.
 * Must be set to 01:02:c9:00:00:01
 */
MLXSW_ITEM_BUF(emad, eth_hdr, dmac, 0x00, 6);

/* emad_eth_hdr_smac
 * Source MAC in EMAD's Ethernet header.
 * Must be set to 00:02:c9:01:02:03
 */
MLXSW_ITEM_BUF(emad, eth_hdr, smac, 0x06, 6);

/* emad_eth_hdr_ethertype
 * Ethertype in EMAD's Ethernet header.
 * Must be set to 0x8932
 */
MLXSW_ITEM32(emad, eth_hdr, ethertype, 0x0C, 16, 16);

/* emad_eth_hdr_mlx_proto
 * Mellanox protocol.
 * Must be set to 0x0.
 */
MLXSW_ITEM32(emad, eth_hdr, mlx_proto, 0x0C, 8, 8);

/* emad_eth_hdr_ver
 * Mellanox protocol version.
 * Must be set to 0x0.
 */
MLXSW_ITEM32(emad, eth_hdr, ver, 0x0C, 4, 4);

/* emad_op_tlv_type
 * Type of the TLV.
 * Must be set to 0x1 (operation TLV).
 */
MLXSW_ITEM32(emad, op_tlv, type, 0x00, 27, 5);

/* emad_op_tlv_len
 * Length of the operation TLV in u32.
 * Must be set to 0x4.
 */
MLXSW_ITEM32(emad, op_tlv, len, 0x00, 16, 11);

/* emad_op_tlv_dr
 * Direct route bit. Setting to 1 indicates the EMAD is a direct route
 * EMAD. DR TLV must follow.
 *
 * Note: Currently not supported and must not be set.
 */
MLXSW_ITEM32(emad, op_tlv, dr, 0x00, 15, 1);

/* emad_op_tlv_status
 * Returned status in case of EMAD response. Must be set to 0 in case
 * of EMAD request.
 * 0x0 - success
 * 0x1 - device is busy. Requester should retry
 * 0x2 - Mellanox protocol version not supported
 * 0x3 - unknown TLV
 * 0x4 - register not supported
 * 0x5 - operation class not supported
 * 0x6 - EMAD method not supported
 * 0x7 - bad parameter (e.g. port out of range)
 * 0x8 - resource not available
 * 0x9 - message receipt acknowledgment. Requester should retry
 * 0x70 - internal error
 */
MLXSW_ITEM32(emad, op_tlv, status, 0x00, 8, 7);

/* emad_op_tlv_register_id
 * Register ID of register within register TLV.
 */
MLXSW_ITEM32(emad, op_tlv, register_id, 0x04, 16, 16);

/* emad_op_tlv_r
 * Response bit. Setting to 1 indicates Response, otherwise request.
 */
MLXSW_ITEM32(emad, op_tlv, r, 0x04, 15, 1);

/* emad_op_tlv_method
 * EMAD method type.
 * 0x1 - query
 * 0x2 - write
 * 0x3 - send (currently not supported)
 * 0x4 - event
 */
MLXSW_ITEM32(emad, op_tlv, method, 0x04, 8, 7);

/* emad_op_tlv_class
 * EMAD operation class. Must be set to 0x1 (REG_ACCESS).
 */
MLXSW_ITEM32(emad, op_tlv, class, 0x04, 0, 8);

/* emad_op_tlv_tid
 * EMAD transaction ID. Used for pairing request and response EMADs.
 */
MLXSW_ITEM64(emad, op_tlv, tid, 0x08, 0, 64);

/* emad_reg_tlv_type
 * Type of the TLV.
 * Must be set to 0x3 (register TLV).
 */
MLXSW_ITEM32(emad, reg_tlv, type, 0x00, 27, 5);

/* emad_reg_tlv_len
 * Length of the operation TLV in u32.
 */
MLXSW_ITEM32(emad, reg_tlv, len, 0x00, 16, 11);

/* emad_end_tlv_type
 * Type of the TLV.
 * Must be set to 0x0 (end TLV).
 */
MLXSW_ITEM32(emad, end_tlv, type, 0x00, 27, 5);

/* emad_end_tlv_len
 * Length of the end TLV in u32.
 * Must be set to 1.
 */
MLXSW_ITEM32(emad, end_tlv, len, 0x00, 16, 11);

enum mlxsw_core_reg_access_type {
        MLXSW_CORE_REG_ACCESS_TYPE_QUERY,
        MLXSW_CORE_REG_ACCESS_TYPE_WRITE,
};

static inline const char *
mlxsw_core_reg_access_type_str(enum mlxsw_core_reg_access_type type)
{
        switch (type) {
        case MLXSW_CORE_REG_ACCESS_TYPE_QUERY:
                return "query";
        case MLXSW_CORE_REG_ACCESS_TYPE_WRITE:
                return "write";
        }
        BUG();
}

static void mlxsw_emad_pack_end_tlv(char *end_tlv)
{
        mlxsw_emad_end_tlv_type_set(end_tlv, MLXSW_EMAD_TLV_TYPE_END);
        mlxsw_emad_end_tlv_len_set(end_tlv, MLXSW_EMAD_END_TLV_LEN);
}

static void mlxsw_emad_pack_reg_tlv(char *reg_tlv,
                                    const struct mlxsw_reg_info *reg,
                                    char *payload)
{
        mlxsw_emad_reg_tlv_type_set(reg_tlv, MLXSW_EMAD_TLV_TYPE_REG);
        mlxsw_emad_reg_tlv_len_set(reg_tlv, reg->len / sizeof(u32) + 1);
        memcpy(reg_tlv + sizeof(u32), payload, reg->len);
}

static void mlxsw_emad_pack_op_tlv(char *op_tlv,
                                   const struct mlxsw_reg_info *reg,
                                   enum mlxsw_core_reg_access_type type,
                                   u64 tid)
{
        mlxsw_emad_op_tlv_type_set(op_tlv, MLXSW_EMAD_TLV_TYPE_OP);
        mlxsw_emad_op_tlv_len_set(op_tlv, MLXSW_EMAD_OP_TLV_LEN);
        mlxsw_emad_op_tlv_dr_set(op_tlv, 0);
        mlxsw_emad_op_tlv_status_set(op_tlv, 0);
        mlxsw_emad_op_tlv_register_id_set(op_tlv, reg->id);
        mlxsw_emad_op_tlv_r_set(op_tlv, MLXSW_EMAD_OP_TLV_REQUEST);
        if (type == MLXSW_CORE_REG_ACCESS_TYPE_QUERY)
                mlxsw_emad_op_tlv_method_set(op_tlv,
                                             MLXSW_EMAD_OP_TLV_METHOD_QUERY);
        else
                mlxsw_emad_op_tlv_method_set(op_tlv,
                                             MLXSW_EMAD_OP_TLV_METHOD_WRITE);
        mlxsw_emad_op_tlv_class_set(op_tlv,
                                    MLXSW_EMAD_OP_TLV_CLASS_REG_ACCESS);
        mlxsw_emad_op_tlv_tid_set(op_tlv, tid);
}

static int mlxsw_emad_construct_eth_hdr(struct sk_buff *skb)
{
        char *eth_hdr = skb_push(skb, MLXSW_EMAD_ETH_HDR_LEN);

        mlxsw_emad_eth_hdr_dmac_memcpy_to(eth_hdr, MLXSW_EMAD_EH_DMAC);
        mlxsw_emad_eth_hdr_smac_memcpy_to(eth_hdr, MLXSW_EMAD_EH_SMAC);
        mlxsw_emad_eth_hdr_ethertype_set(eth_hdr, MLXSW_EMAD_EH_ETHERTYPE);
        mlxsw_emad_eth_hdr_mlx_proto_set(eth_hdr, MLXSW_EMAD_EH_MLX_PROTO);
        mlxsw_emad_eth_hdr_ver_set(eth_hdr, MLXSW_EMAD_EH_PROTO_VERSION);

        skb_reset_mac_header(skb);

        return 0;
}

static void mlxsw_emad_construct(struct sk_buff *skb,
                                 const struct mlxsw_reg_info *reg,
                                 char *payload,
                                 enum mlxsw_core_reg_access_type type,
                                 u64 tid)
{
        char *buf;

        buf = skb_push(skb, MLXSW_EMAD_END_TLV_LEN * sizeof(u32));
        mlxsw_emad_pack_end_tlv(buf);

        buf = skb_push(skb, reg->len + sizeof(u32));
        mlxsw_emad_pack_reg_tlv(buf, reg, payload);

        buf = skb_push(skb, MLXSW_EMAD_OP_TLV_LEN * sizeof(u32));
        mlxsw_emad_pack_op_tlv(buf, reg, type, tid);

        mlxsw_emad_construct_eth_hdr(skb);
}

static char *mlxsw_emad_op_tlv(const struct sk_buff *skb)
{
        return ((char *) (skb->data + MLXSW_EMAD_ETH_HDR_LEN));
}

static char *mlxsw_emad_reg_tlv(const struct sk_buff *skb)
{
        return ((char *) (skb->data + MLXSW_EMAD_ETH_HDR_LEN +
                                      MLXSW_EMAD_OP_TLV_LEN * sizeof(u32)));
}

static char *mlxsw_emad_reg_payload(const char *op_tlv)
{
        return ((char *) (op_tlv + (MLXSW_EMAD_OP_TLV_LEN + 1) * sizeof(u32)));
}

static u64 mlxsw_emad_get_tid(const struct sk_buff *skb)
{
        char *op_tlv;

        op_tlv = mlxsw_emad_op_tlv(skb);
        return mlxsw_emad_op_tlv_tid_get(op_tlv);
}

static bool mlxsw_emad_is_resp(const struct sk_buff *skb)
{
        char *op_tlv;

        op_tlv = mlxsw_emad_op_tlv(skb);
        return (mlxsw_emad_op_tlv_r_get(op_tlv) == MLXSW_EMAD_OP_TLV_RESPONSE);
}

static int mlxsw_emad_process_status(char *op_tlv,
                                     enum mlxsw_emad_op_tlv_status *p_status)
{
        *p_status = mlxsw_emad_op_tlv_status_get(op_tlv);

        switch (*p_status) {
        case MLXSW_EMAD_OP_TLV_STATUS_SUCCESS:
                return 0;
        case MLXSW_EMAD_OP_TLV_STATUS_BUSY:
        case MLXSW_EMAD_OP_TLV_STATUS_MESSAGE_RECEIPT_ACK:
                return -EAGAIN;
        case MLXSW_EMAD_OP_TLV_STATUS_VERSION_NOT_SUPPORTED:
        case MLXSW_EMAD_OP_TLV_STATUS_UNKNOWN_TLV:
        case MLXSW_EMAD_OP_TLV_STATUS_REGISTER_NOT_SUPPORTED:
        case MLXSW_EMAD_OP_TLV_STATUS_CLASS_NOT_SUPPORTED:
        case MLXSW_EMAD_OP_TLV_STATUS_METHOD_NOT_SUPPORTED:
        case MLXSW_EMAD_OP_TLV_STATUS_BAD_PARAMETER:
        case MLXSW_EMAD_OP_TLV_STATUS_RESOURCE_NOT_AVAILABLE:
        case MLXSW_EMAD_OP_TLV_STATUS_INTERNAL_ERROR:
        default:
                return -EIO;
        }
}

static int
mlxsw_emad_process_status_skb(struct sk_buff *skb,
                              enum mlxsw_emad_op_tlv_status *p_status)
{
        return mlxsw_emad_process_status(mlxsw_emad_op_tlv(skb), p_status);
}

struct mlxsw_reg_trans {
        struct list_head list;
        struct list_head bulk_list;
        struct mlxsw_core *core;
        struct sk_buff *tx_skb;
        struct mlxsw_tx_info tx_info;
        struct delayed_work timeout_dw;
        unsigned int retries;
        u64 tid;
        struct completion completion;
        atomic_t active;
        mlxsw_reg_trans_cb_t *cb;
        unsigned long cb_priv;
        const struct mlxsw_reg_info *reg;
        enum mlxsw_core_reg_access_type type;
        int err;
        enum mlxsw_emad_op_tlv_status emad_status;
        struct rcu_head rcu;
};

#define MLXSW_EMAD_TIMEOUT_MS 200

static void mlxsw_emad_trans_timeout_schedule(struct mlxsw_reg_trans *trans)
{
        unsigned long timeout = msecs_to_jiffies(MLXSW_EMAD_TIMEOUT_MS);

        mlxsw_core_schedule_dw(&trans->timeout_dw, timeout);
}

static int mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core,
                               struct mlxsw_reg_trans *trans)
{
        struct sk_buff *skb;
        int err;

        skb = skb_copy(trans->tx_skb, GFP_KERNEL);
        if (!skb)
                return -ENOMEM;

        trace_devlink_hwmsg(priv_to_devlink(mlxsw_core), false, 0,
                            skb->data + mlxsw_core->driver->txhdr_len,
                            skb->len - mlxsw_core->driver->txhdr_len);

        atomic_set(&trans->active, 1);
        err = mlxsw_core_skb_transmit(mlxsw_core, skb, &trans->tx_info);
        if (err) {
                dev_kfree_skb(skb);
                return err;
        }
        mlxsw_emad_trans_timeout_schedule(trans);
        return 0;
}

static void mlxsw_emad_trans_finish(struct mlxsw_reg_trans *trans, int err)
{
        struct mlxsw_core *mlxsw_core = trans->core;

        dev_kfree_skb(trans->tx_skb);
        spin_lock_bh(&mlxsw_core->emad.trans_list_lock);
        list_del_rcu(&trans->list);
        spin_unlock_bh(&mlxsw_core->emad.trans_list_lock);
        trans->err = err;
        complete(&trans->completion);
}

static void mlxsw_emad_transmit_retry(struct mlxsw_core *mlxsw_core,
                                      struct mlxsw_reg_trans *trans)
{
        int err;

        if (trans->retries < MLXSW_EMAD_MAX_RETRY) {
                trans->retries++;
                err = mlxsw_emad_transmit(trans->core, trans);
                if (err == 0)
                        return;
        } else {
                err = -EIO;
        }
        mlxsw_emad_trans_finish(trans, err);
}

static void mlxsw_emad_trans_timeout_work(struct work_struct *work)
{
        struct mlxsw_reg_trans *trans = container_of(work,
                                                     struct mlxsw_reg_trans,
                                                     timeout_dw.work);

        if (!atomic_dec_and_test(&trans->active))
                return;

        mlxsw_emad_transmit_retry(trans->core, trans);
}

static void mlxsw_emad_process_response(struct mlxsw_core *mlxsw_core,
                                        struct mlxsw_reg_trans *trans,
                                        struct sk_buff *skb)
{
        int err;

        if (!atomic_dec_and_test(&trans->active))
                return;

        err = mlxsw_emad_process_status_skb(skb, &trans->emad_status);
        if (err == -EAGAIN) {
                mlxsw_emad_transmit_retry(mlxsw_core, trans);
        } else {
                if (err == 0) {
                        char *op_tlv = mlxsw_emad_op_tlv(skb);

                        if (trans->cb)
                                trans->cb(mlxsw_core,
                                          mlxsw_emad_reg_payload(op_tlv),
                                          trans->reg->len, trans->cb_priv);
                }
                mlxsw_emad_trans_finish(trans, err);
        }
}

/* called with rcu read lock held */
static void mlxsw_emad_rx_listener_func(struct sk_buff *skb, u8 local_port,
                                        void *priv)
{
        struct mlxsw_core *mlxsw_core = priv;
        struct mlxsw_reg_trans *trans;

        trace_devlink_hwmsg(priv_to_devlink(mlxsw_core), true, 0,
                            skb->data, skb->len);

        if (!mlxsw_emad_is_resp(skb))
                goto free_skb;

        list_for_each_entry_rcu(trans, &mlxsw_core->emad.trans_list, list) {
                if (mlxsw_emad_get_tid(skb) == trans->tid) {
                        mlxsw_emad_process_response(mlxsw_core, trans, skb);
                        break;
                }
        }

free_skb:
        dev_kfree_skb(skb);
}

static const struct mlxsw_listener mlxsw_emad_rx_listener =
        MLXSW_RXL(mlxsw_emad_rx_listener_func, ETHEMAD, TRAP_TO_CPU, false,
                  EMAD, DISCARD);

static int mlxsw_emad_init(struct mlxsw_core *mlxsw_core)
{
        u64 tid;
        int err;

        if (!(mlxsw_core->bus->features & MLXSW_BUS_F_TXRX))
                return 0;

        /* Set the upper 32 bits of the transaction ID field to a random
         * number. This allows us to discard EMADs addressed to other
         * devices.
         */
        get_random_bytes(&tid, 4);
        tid <<= 32;
        atomic64_set(&mlxsw_core->emad.tid, tid);

        INIT_LIST_HEAD(&mlxsw_core->emad.trans_list);
        spin_lock_init(&mlxsw_core->emad.trans_list_lock);

        err = mlxsw_core_trap_register(mlxsw_core, &mlxsw_emad_rx_listener,
                                       mlxsw_core);
        if (err)
                return err;

        err = mlxsw_core->driver->basic_trap_groups_set(mlxsw_core);
        if (err)
                goto err_emad_trap_set;
        mlxsw_core->emad.use_emad = true;

        return 0;

err_emad_trap_set:
        mlxsw_core_trap_unregister(mlxsw_core, &mlxsw_emad_rx_listener,
                                   mlxsw_core);
        return err;
}

static void mlxsw_emad_fini(struct mlxsw_core *mlxsw_core)
{

        if (!(mlxsw_core->bus->features & MLXSW_BUS_F_TXRX))
                return;

        mlxsw_core->emad.use_emad = false;
        mlxsw_core_trap_unregister(mlxsw_core, &mlxsw_emad_rx_listener,
                                   mlxsw_core);
}

static struct sk_buff *mlxsw_emad_alloc(const struct mlxsw_core *mlxsw_core,
                                        u16 reg_len)
{
        struct sk_buff *skb;
        u16 emad_len;

        emad_len = (reg_len + sizeof(u32) + MLXSW_EMAD_ETH_HDR_LEN +
                    (MLXSW_EMAD_OP_TLV_LEN + MLXSW_EMAD_END_TLV_LEN) *
                    sizeof(u32) + mlxsw_core->driver->txhdr_len);
        if (emad_len > MLXSW_EMAD_MAX_FRAME_LEN)
                return NULL;

        skb = netdev_alloc_skb(NULL, emad_len);
        if (!skb)
                return NULL;
        memset(skb->data, 0, emad_len);
        skb_reserve(skb, emad_len);

        return skb;
}

static int mlxsw_emad_reg_access(struct mlxsw_core *mlxsw_core,
                                 const struct mlxsw_reg_info *reg,
                                 char *payload,
                                 enum mlxsw_core_reg_access_type type,
                                 struct mlxsw_reg_trans *trans,
                                 struct list_head *bulk_list,
                                 mlxsw_reg_trans_cb_t *cb,
                                 unsigned long cb_priv, u64 tid)
{
        struct sk_buff *skb;
        int err;

        dev_dbg(mlxsw_core->bus_info->dev, "EMAD reg access (tid=%llx,reg_id=%x(%s),type=%s)\n",
                tid, reg->id, mlxsw_reg_id_str(reg->id),
                mlxsw_core_reg_access_type_str(type));

        skb = mlxsw_emad_alloc(mlxsw_core, reg->len);
        if (!skb)
                return -ENOMEM;

        list_add_tail(&trans->bulk_list, bulk_list);
        trans->core = mlxsw_core;
        trans->tx_skb = skb;
        trans->tx_info.local_port = MLXSW_PORT_CPU_PORT;
        trans->tx_info.is_emad = true;
        INIT_DELAYED_WORK(&trans->timeout_dw, mlxsw_emad_trans_timeout_work);
        trans->tid = tid;
        init_completion(&trans->completion);
        trans->cb = cb;
        trans->cb_priv = cb_priv;
        trans->reg = reg;
        trans->type = type;

        mlxsw_emad_construct(skb, reg, payload, type, trans->tid);
        mlxsw_core->driver->txhdr_construct(skb, &trans->tx_info);

        spin_lock_bh(&mlxsw_core->emad.trans_list_lock);
        list_add_tail_rcu(&trans->list, &mlxsw_core->emad.trans_list);
        spin_unlock_bh(&mlxsw_core->emad.trans_list_lock);
        err = mlxsw_emad_transmit(mlxsw_core, trans);
        if (err)
                goto err_out;
        return 0;

err_out:
        spin_lock_bh(&mlxsw_core->emad.trans_list_lock);
        list_del_rcu(&trans->list);
        spin_unlock_bh(&mlxsw_core->emad.trans_list_lock);
        list_del(&trans->bulk_list);
        dev_kfree_skb(trans->tx_skb);
        return err;
}

/*****************
 * Core functions
 *****************/

int mlxsw_core_driver_register(struct mlxsw_driver *mlxsw_driver)
{
        spin_lock(&mlxsw_core_driver_list_lock);
        list_add_tail(&mlxsw_driver->list, &mlxsw_core_driver_list);
        spin_unlock(&mlxsw_core_driver_list_lock);
        return 0;
}
EXPORT_SYMBOL(mlxsw_core_driver_register);

void mlxsw_core_driver_unregister(struct mlxsw_driver *mlxsw_driver)
{
        spin_lock(&mlxsw_core_driver_list_lock);
        list_del(&mlxsw_driver->list);
        spin_unlock(&mlxsw_core_driver_list_lock);
}
EXPORT_SYMBOL(mlxsw_core_driver_unregister);

static struct mlxsw_driver *__driver_find(const char *kind)
{
        struct mlxsw_driver *mlxsw_driver;

        list_for_each_entry(mlxsw_driver, &mlxsw_core_driver_list, list) {
                if (strcmp(mlxsw_driver->kind, kind) == 0)
                        return mlxsw_driver;
        }
        return NULL;
}

static struct mlxsw_driver *mlxsw_core_driver_get(const char *kind)
{
        struct mlxsw_driver *mlxsw_driver;

        spin_lock(&mlxsw_core_driver_list_lock);
        mlxsw_driver = __driver_find(kind);
        spin_unlock(&mlxsw_core_driver_list_lock);
        return mlxsw_driver;
}

static void mlxsw_core_driver_put(const char *kind)
{
        struct mlxsw_driver *mlxsw_driver;

        spin_lock(&mlxsw_core_driver_list_lock);
        mlxsw_driver = __driver_find(kind);
        spin_unlock(&mlxsw_core_driver_list_lock);
}

static int mlxsw_devlink_port_split(struct devlink *devlink,
                                    unsigned int port_index,
                                    unsigned int count)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink);

        if (port_index >= mlxsw_core->max_ports)
                return -EINVAL;
        if (!mlxsw_core->driver->port_split)
                return -EOPNOTSUPP;
        return mlxsw_core->driver->port_split(mlxsw_core, port_index, count);
}

static int mlxsw_devlink_port_unsplit(struct devlink *devlink,
                                      unsigned int port_index)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink);

        if (port_index >= mlxsw_core->max_ports)
                return -EINVAL;
        if (!mlxsw_core->driver->port_unsplit)
                return -EOPNOTSUPP;
        return mlxsw_core->driver->port_unsplit(mlxsw_core, port_index);
}

static int
mlxsw_devlink_sb_pool_get(struct devlink *devlink,
                          unsigned int sb_index, u16 pool_index,
                          struct devlink_sb_pool_info *pool_info)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;

        if (!mlxsw_driver->sb_pool_get)
                return -EOPNOTSUPP;
        return mlxsw_driver->sb_pool_get(mlxsw_core, sb_index,
                                         pool_index, pool_info);
}

static int
mlxsw_devlink_sb_pool_set(struct devlink *devlink,
                          unsigned int sb_index, u16 pool_index, u32 size,
                          enum devlink_sb_threshold_type threshold_type)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;

        if (!mlxsw_driver->sb_pool_set)
                return -EOPNOTSUPP;
        return mlxsw_driver->sb_pool_set(mlxsw_core, sb_index,
                                         pool_index, size, threshold_type);
}

static void *__dl_port(struct devlink_port *devlink_port)
{
        return container_of(devlink_port, struct mlxsw_core_port, devlink_port);
}

static int mlxsw_devlink_port_type_set(struct devlink_port *devlink_port,
                                       enum devlink_port_type port_type)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
        struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);

        if (!mlxsw_driver->port_type_set)
                return -EOPNOTSUPP;

        return mlxsw_driver->port_type_set(mlxsw_core,
                                           mlxsw_core_port->local_port,
                                           port_type);
}

static int mlxsw_devlink_sb_port_pool_get(struct devlink_port *devlink_port,
                                          unsigned int sb_index, u16 pool_index,
                                          u32 *p_threshold)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
        struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);

        if (!mlxsw_driver->sb_port_pool_get ||
            !mlxsw_core_port_check(mlxsw_core_port))
                return -EOPNOTSUPP;
        return mlxsw_driver->sb_port_pool_get(mlxsw_core_port, sb_index,
                                              pool_index, p_threshold);
}

static int mlxsw_devlink_sb_port_pool_set(struct devlink_port *devlink_port,
                                          unsigned int sb_index, u16 pool_index,
                                          u32 threshold)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
        struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);

        if (!mlxsw_driver->sb_port_pool_set ||
            !mlxsw_core_port_check(mlxsw_core_port))
                return -EOPNOTSUPP;
        return mlxsw_driver->sb_port_pool_set(mlxsw_core_port, sb_index,
                                              pool_index, threshold);
}

static int
mlxsw_devlink_sb_tc_pool_bind_get(struct devlink_port *devlink_port,
                                  unsigned int sb_index, u16 tc_index,
                                  enum devlink_sb_pool_type pool_type,
                                  u16 *p_pool_index, u32 *p_threshold)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
        struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);

        if (!mlxsw_driver->sb_tc_pool_bind_get ||
            !mlxsw_core_port_check(mlxsw_core_port))
                return -EOPNOTSUPP;
        return mlxsw_driver->sb_tc_pool_bind_get(mlxsw_core_port, sb_index,
                                                 tc_index, pool_type,
                                                 p_pool_index, p_threshold);
}

static int
mlxsw_devlink_sb_tc_pool_bind_set(struct devlink_port *devlink_port,
                                  unsigned int sb_index, u16 tc_index,
                                  enum devlink_sb_pool_type pool_type,
                                  u16 pool_index, u32 threshold)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
        struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);

        if (!mlxsw_driver->sb_tc_pool_bind_set ||
            !mlxsw_core_port_check(mlxsw_core_port))
                return -EOPNOTSUPP;
        return mlxsw_driver->sb_tc_pool_bind_set(mlxsw_core_port, sb_index,
                                                 tc_index, pool_type,
                                                 pool_index, threshold);
}

static int mlxsw_devlink_sb_occ_snapshot(struct devlink *devlink,
                                         unsigned int sb_index)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;

        if (!mlxsw_driver->sb_occ_snapshot)
                return -EOPNOTSUPP;
        return mlxsw_driver->sb_occ_snapshot(mlxsw_core, sb_index);
}

static int mlxsw_devlink_sb_occ_max_clear(struct devlink *devlink,
                                          unsigned int sb_index)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;

        if (!mlxsw_driver->sb_occ_max_clear)
                return -EOPNOTSUPP;
        return mlxsw_driver->sb_occ_max_clear(mlxsw_core, sb_index);
}

static int
mlxsw_devlink_sb_occ_port_pool_get(struct devlink_port *devlink_port,
                                   unsigned int sb_index, u16 pool_index,
                                   u32 *p_cur, u32 *p_max)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
        struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);

        if (!mlxsw_driver->sb_occ_port_pool_get ||
            !mlxsw_core_port_check(mlxsw_core_port))
                return -EOPNOTSUPP;
        return mlxsw_driver->sb_occ_port_pool_get(mlxsw_core_port, sb_index,
                                                  pool_index, p_cur, p_max);
}

static int
mlxsw_devlink_sb_occ_tc_port_bind_get(struct devlink_port *devlink_port,
                                      unsigned int sb_index, u16 tc_index,
                                      enum devlink_sb_pool_type pool_type,
                                      u32 *p_cur, u32 *p_max)
{
        struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
        struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
        struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);

        if (!mlxsw_driver->sb_occ_tc_port_bind_get ||
            !mlxsw_core_port_check(mlxsw_core_port))
                return -EOPNOTSUPP;
        return mlxsw_driver->sb_occ_tc_port_bind_get(mlxsw_core_port,
                                                     sb_index, tc_index,
                                                     pool_type, p_cur, p_max);
}

static const struct devlink_ops mlxsw_devlink_ops = {
        .port_type_set                  = mlxsw_devlink_port_type_set,
        .port_split                     = mlxsw_devlink_port_split,
        .port_unsplit                   = mlxsw_devlink_port_unsplit,
        .sb_pool_get                    = mlxsw_devlink_sb_pool_get,
        .sb_pool_set                    = mlxsw_devlink_sb_pool_set,
        .sb_port_pool_get               = mlxsw_devlink_sb_port_pool_get,
        .sb_port_pool_set               = mlxsw_devlink_sb_port_pool_set,
        .sb_tc_pool_bind_get            = mlxsw_devlink_sb_tc_pool_bind_get,
        .sb_tc_pool_bind_set            = mlxsw_devlink_sb_tc_pool_bind_set,
        .sb_occ_snapshot                = mlxsw_devlink_sb_occ_snapshot,
        .sb_occ_max_clear               = mlxsw_devlink_sb_occ_max_clear,
        .sb_occ_port_pool_get           = mlxsw_devlink_sb_occ_port_pool_get,
        .sb_occ_tc_port_bind_get        = mlxsw_devlink_sb_occ_tc_port_bind_get,
};

int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
                                   const struct mlxsw_bus *mlxsw_bus,
                                   void *bus_priv)
{
        const char *device_kind = mlxsw_bus_info->device_kind;
        struct mlxsw_core *mlxsw_core;
        struct mlxsw_driver *mlxsw_driver;
        struct devlink *devlink;
        size_t alloc_size;
        int err;

        mlxsw_driver = mlxsw_core_driver_get(device_kind);
        if (!mlxsw_driver)
                return -EINVAL;
        alloc_size = sizeof(*mlxsw_core) + mlxsw_driver->priv_size;
        devlink = devlink_alloc(&mlxsw_devlink_ops, alloc_size);
        if (!devlink) {
                err = -ENOMEM;
                goto err_devlink_alloc;
        }

        mlxsw_core = devlink_priv(devlink);
        INIT_LIST_HEAD(&mlxsw_core->rx_listener_list);
        INIT_LIST_HEAD(&mlxsw_core->event_listener_list);
        mlxsw_core->driver = mlxsw_driver;
        mlxsw_core->bus = mlxsw_bus;
        mlxsw_core->bus_priv = bus_priv;
        mlxsw_core->bus_info = mlxsw_bus_info;

        err = mlxsw_bus->init(bus_priv, mlxsw_core, mlxsw_driver->profile,
                              &mlxsw_core->res);
        if (err)
                goto err_bus_init;

        err = mlxsw_ports_init(mlxsw_core);
        if (err)
                goto err_ports_init;

        if (MLXSW_CORE_RES_VALID(mlxsw_core, MAX_LAG) &&
            MLXSW_CORE_RES_VALID(mlxsw_core, MAX_LAG_MEMBERS)) {
                alloc_size = sizeof(u8) *
                        MLXSW_CORE_RES_GET(mlxsw_core, MAX_LAG) *
                        MLXSW_CORE_RES_GET(mlxsw_core, MAX_LAG_MEMBERS);
                mlxsw_core->lag.mapping = kzalloc(alloc_size, GFP_KERNEL);
                if (!mlxsw_core->lag.mapping) {
                        err = -ENOMEM;
                        goto err_alloc_lag_mapping;
                }
        }

        err = mlxsw_emad_init(mlxsw_core);
        if (err)
                goto err_emad_init;

        err = devlink_register(devlink, mlxsw_bus_info->dev);
        if (err)
                goto err_devlink_register;

        err = mlxsw_hwmon_init(mlxsw_core, mlxsw_bus_info, &mlxsw_core->hwmon);
        if (err)
                goto err_hwmon_init;

        err = mlxsw_thermal_init(mlxsw_core, mlxsw_bus_info,
                                 &mlxsw_core->thermal);
        if (err)
                goto err_thermal_init;

        if (mlxsw_driver->init) {
                err = mlxsw_driver->init(mlxsw_core, mlxsw_bus_info);
                if (err)
                        goto err_driver_init;
        }

        return 0;

err_driver_init:
        mlxsw_thermal_fini(mlxsw_core->thermal);
err_thermal_init:
err_hwmon_init:
        devlink_unregister(devlink);
err_devlink_register:
        mlxsw_emad_fini(mlxsw_core);
err_emad_init:
        kfree(mlxsw_core->lag.mapping);
err_alloc_lag_mapping:
        mlxsw_ports_fini(mlxsw_core);
err_ports_init:
        mlxsw_bus->fini(bus_priv);
err_bus_init:
        devlink_free(devlink);
err_devlink_alloc:
        mlxsw_core_driver_put(device_kind);
        return err;
}
EXPORT_SYMBOL(mlxsw_core_bus_device_register);

void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core)
{
        const char *device_kind = mlxsw_core->bus_info->device_kind;
        struct devlink *devlink = priv_to_devlink(mlxsw_core);

        if (mlxsw_core->driver->fini)
                mlxsw_core->driver->fini(mlxsw_core);
        mlxsw_thermal_fini(mlxsw_core->thermal);
        devlink_unregister(devlink);
        mlxsw_emad_fini(mlxsw_core);
        kfree(mlxsw_core->lag.mapping);
        mlxsw_ports_fini(mlxsw_core);
        mlxsw_core->bus->fini(mlxsw_core->bus_priv);
        devlink_free(devlink);
        mlxsw_core_driver_put(device_kind);
}
EXPORT_SYMBOL(mlxsw_core_bus_device_unregister);

bool mlxsw_core_skb_transmit_busy(struct mlxsw_core *mlxsw_core,
                                  const struct mlxsw_tx_info *tx_info)
{
        return mlxsw_core->bus->skb_transmit_busy(mlxsw_core->bus_priv,
                                                  tx_info);
}
EXPORT_SYMBOL(mlxsw_core_skb_transmit_busy);

int mlxsw_core_skb_transmit(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
                            const struct mlxsw_tx_info *tx_info)
{
        return mlxsw_core->bus->skb_transmit(mlxsw_core->bus_priv, skb,
                                             tx_info);
}
EXPORT_SYMBOL(mlxsw_core_skb_transmit);

static bool __is_rx_listener_equal(const struct mlxsw_rx_listener *rxl_a,
                                   const struct mlxsw_rx_listener *rxl_b)
{
        return (rxl_a->func == rxl_b->func &&
                rxl_a->local_port == rxl_b->local_port &&
                rxl_a->trap_id == rxl_b->trap_id);
}

static struct mlxsw_rx_listener_item *
__find_rx_listener_item(struct mlxsw_core *mlxsw_core,
                        const struct mlxsw_rx_listener *rxl,
                        void *priv)
{
        struct mlxsw_rx_listener_item *rxl_item;

        list_for_each_entry(rxl_item, &mlxsw_core->rx_listener_list, list) {
                if (__is_rx_listener_equal(&rxl_item->rxl, rxl) &&
                    rxl_item->priv == priv)
                        return rxl_item;
        }
        return NULL;
}

int mlxsw_core_rx_listener_register(struct mlxsw_core *mlxsw_core,
                                    const struct mlxsw_rx_listener *rxl,
                                    void *priv)
{
        struct mlxsw_rx_listener_item *rxl_item;

        rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv);
        if (rxl_item)
                return -EEXIST;
        rxl_item = kmalloc(sizeof(*rxl_item), GFP_KERNEL);
        if (!rxl_item)
                return -ENOMEM;
        rxl_item->rxl = *rxl;
        rxl_item->priv = priv;

        list_add_rcu(&rxl_item->list, &mlxsw_core->rx_listener_list);
        return 0;
}
EXPORT_SYMBOL(mlxsw_core_rx_listener_register);

void mlxsw_core_rx_listener_unregister(struct mlxsw_core *mlxsw_core,
                                       const struct mlxsw_rx_listener *rxl,
                                       void *priv)
{
        struct mlxsw_rx_listener_item *rxl_item;

        rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv);
        if (!rxl_item)
                return;
        list_del_rcu(&rxl_item->list);
        synchronize_rcu();
        kfree(rxl_item);
}
EXPORT_SYMBOL(mlxsw_core_rx_listener_unregister);

static void mlxsw_core_event_listener_func(struct sk_buff *skb, u8 local_port,
                                           void *priv)
{
        struct mlxsw_event_listener_item *event_listener_item = priv;
        struct mlxsw_reg_info reg;
        char *payload;
        char *op_tlv = mlxsw_emad_op_tlv(skb);
        char *reg_tlv = mlxsw_emad_reg_tlv(skb);

        reg.id = mlxsw_emad_op_tlv_register_id_get(op_tlv);
        reg.len = (mlxsw_emad_reg_tlv_len_get(reg_tlv) - 1) * sizeof(u32);
        payload = mlxsw_emad_reg_payload(op_tlv);
        event_listener_item->el.func(&reg, payload, event_listener_item->priv);
        dev_kfree_skb(skb);
}

static bool __is_event_listener_equal(const struct mlxsw_event_listener *el_a,
                                      const struct mlxsw_event_listener *el_b)
{
        return (el_a->func == el_b->func &&
                el_a->trap_id == el_b->trap_id);
}

static struct mlxsw_event_listener_item *
__find_event_listener_item(struct mlxsw_core *mlxsw_core,
                           const struct mlxsw_event_listener *el,
                           void *priv)
{
        struct mlxsw_event_listener_item *el_item;

        list_for_each_entry(el_item, &mlxsw_core->event_listener_list, list) {
                if (__is_event_listener_equal(&el_item->el, el) &&
                    el_item->priv == priv)
                        return el_item;
        }
        return NULL;
}

int mlxsw_core_event_listener_register(struct mlxsw_core *mlxsw_core,
                                       const struct mlxsw_event_listener *el,
                                       void *priv)
{
        int err;
        struct mlxsw_event_listener_item *el_item;
        const struct mlxsw_rx_listener rxl = {
                .func = mlxsw_core_event_listener_func,
                .local_port = MLXSW_PORT_DONT_CARE,
                .trap_id = el->trap_id,
        };

        el_item = __find_event_listener_item(mlxsw_core, el, priv);
        if (el_item)
                return -EEXIST;
        el_item = kmalloc(sizeof(*el_item), GFP_KERNEL);
        if (!el_item)
                return -ENOMEM;
        el_item->el = *el;
        el_item->priv = priv;

        err = mlxsw_core_rx_listener_register(mlxsw_core, &rxl, el_item);
        if (err)
                goto err_rx_listener_register;

        /* No reason to save item if we did not manage to register an RX
         * listener for it.
         */
        list_add_rcu(&el_item->list, &mlxsw_core->event_listener_list);

        return 0;

err_rx_listener_register:
        kfree(el_item);
        return err;
}
EXPORT_SYMBOL(mlxsw_core_event_listener_register);

void mlxsw_core_event_listener_unregister(struct mlxsw_core *mlxsw_core,
                                          const struct mlxsw_event_listener *el,
                                          void *priv)
{
        struct mlxsw_event_listener_item *el_item;
        const struct mlxsw_rx_listener rxl = {
                .func = mlxsw_core_event_listener_func,
                .local_port = MLXSW_PORT_DONT_CARE,
                .trap_id = el->trap_id,
        };

        el_item = __find_event_listener_item(mlxsw_core, el, priv);
        if (!el_item)
                return;
        mlxsw_core_rx_listener_unregister(mlxsw_core, &rxl, el_item);
        list_del(&el_item->list);
        kfree(el_item);
}
EXPORT_SYMBOL(mlxsw_core_event_listener_unregister);

static int mlxsw_core_listener_register(struct mlxsw_core *mlxsw_core,
                                        const struct mlxsw_listener *listener,
                                        void *priv)
{
        if (listener->is_event)
                return mlxsw_core_event_listener_register(mlxsw_core,
                                                &listener->u.event_listener,
                                                priv);
        else
                return mlxsw_core_rx_listener_register(mlxsw_core,
                                                &listener->u.rx_listener,
                                                priv);
}

static void mlxsw_core_listener_unregister(struct mlxsw_core *mlxsw_core,
                                      const struct mlxsw_listener *listener,
                                      void *priv)
{
        if (listener->is_event)
                mlxsw_core_event_listener_unregister(mlxsw_core,
                                                     &listener->u.event_listener,
                                                     priv);
        else
                mlxsw_core_rx_listener_unregister(mlxsw_core,
                                                  &listener->u.rx_listener,
                                                  priv);
}

int mlxsw_core_trap_register(struct mlxsw_core *mlxsw_core,
                             const struct mlxsw_listener *listener, void *priv)
{
        char hpkt_pl[MLXSW_REG_HPKT_LEN];
        int err;

        err = mlxsw_core_listener_register(mlxsw_core, listener, priv);
        if (err)
                return err;

        mlxsw_reg_hpkt_pack(hpkt_pl, listener->action, listener->trap_id,
                            listener->trap_group, listener->is_ctrl);
        err = mlxsw_reg_write(mlxsw_core,  MLXSW_REG(hpkt), hpkt_pl);
        if (err)
                goto err_trap_set;

        return 0;

err_trap_set:
        mlxsw_core_listener_unregister(mlxsw_core, listener, priv);
        return err;
}
EXPORT_SYMBOL(mlxsw_core_trap_register);

void mlxsw_core_trap_unregister(struct mlxsw_core *mlxsw_core,
                                const struct mlxsw_listener *listener,
                                void *priv)
{
        char hpkt_pl[MLXSW_REG_HPKT_LEN];

        if (!listener->is_event) {
                mlxsw_reg_hpkt_pack(hpkt_pl, listener->unreg_action,
                                    listener->trap_id, listener->trap_group,
                                    listener->is_ctrl);
                mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl);
        }

        mlxsw_core_listener_unregister(mlxsw_core, listener, priv);
}
EXPORT_SYMBOL(mlxsw_core_trap_unregister);

static u64 mlxsw_core_tid_get(struct mlxsw_core *mlxsw_core)
{
        return atomic64_inc_return(&mlxsw_core->emad.tid);
}

static int mlxsw_core_reg_access_emad(struct mlxsw_core *mlxsw_core,
                                      const struct mlxsw_reg_info *reg,
                                      char *payload,
                                      enum mlxsw_core_reg_access_type type,
                                      struct list_head *bulk_list,
                                      mlxsw_reg_trans_cb_t *cb,
                                      unsigned long cb_priv)
{
        u64 tid = mlxsw_core_tid_get(mlxsw_core);
        struct mlxsw_reg_trans *trans;
        int err;

        trans = kzalloc(sizeof(*trans), GFP_KERNEL);
        if (!trans)
                return -ENOMEM;

        err = mlxsw_emad_reg_access(mlxsw_core, reg, payload, type, trans,
                                    bulk_list, cb, cb_priv, tid);
        if (err) {
                kfree(trans);
                return err;
        }
        return 0;
}

int mlxsw_reg_trans_query(struct mlxsw_core *mlxsw_core,
                          const struct mlxsw_reg_info *reg, char *payload,
                          struct list_head *bulk_list,
                          mlxsw_reg_trans_cb_t *cb, unsigned long cb_priv)
{
        return mlxsw_core_reg_access_emad(mlxsw_core, reg, payload,
                                          MLXSW_CORE_REG_ACCESS_TYPE_QUERY,
                                          bulk_list, cb, cb_priv);
}
EXPORT_SYMBOL(mlxsw_reg_trans_query);

int mlxsw_reg_trans_write(struct mlxsw_core *mlxsw_core,
                          const struct mlxsw_reg_info *reg, char *payload,
                          struct list_head *bulk_list,
                          mlxsw_reg_trans_cb_t *cb, unsigned long cb_priv)
{
        return mlxsw_core_reg_access_emad(mlxsw_core, reg, payload,
                                          MLXSW_CORE_REG_ACCESS_TYPE_WRITE,
                                          bulk_list, cb, cb_priv);
}
EXPORT_SYMBOL(mlxsw_reg_trans_write);

static int mlxsw_reg_trans_wait(struct mlxsw_reg_trans *trans)
{
        struct mlxsw_core *mlxsw_core = trans->core;
        int err;

        wait_for_completion(&trans->completion);
        cancel_delayed_work_sync(&trans->timeout_dw);
        err = trans->err;

        if (trans->retries)
                dev_warn(mlxsw_core->bus_info->dev, "EMAD retries (%d/%d) (tid=%llx)\n",
                         trans->retries, MLXSW_EMAD_MAX_RETRY, trans->tid);
        if (err)
                dev_err(mlxsw_core->bus_info->dev, "EMAD reg access failed (tid=%llx,reg_id=%x(%s),type=%s,status=%x(%s))\n",
                        trans->tid, trans->reg->id,
                        mlxsw_reg_id_str(trans->reg->id),
                        mlxsw_core_reg_access_type_str(trans->type),
                        trans->emad_status,
                        mlxsw_emad_op_tlv_status_str(trans->emad_status));

        list_del(&trans->bulk_list);
        kfree_rcu(trans, rcu);
        return err;
}

int mlxsw_reg_trans_bulk_wait(struct list_head *bulk_list)
{
        struct mlxsw_reg_trans *trans;
        struct mlxsw_reg_trans *tmp;
        int sum_err = 0;
        int err;

        list_for_each_entry_safe(trans, tmp, bulk_list, bulk_list) {
                err = mlxsw_reg_trans_wait(trans);
                if (err && sum_err == 0)
                        sum_err = err; /* first error to be returned */
        }
        return sum_err;
}
EXPORT_SYMBOL(mlxsw_reg_trans_bulk_wait);

static int mlxsw_core_reg_access_cmd(struct mlxsw_core *mlxsw_core,
                                     const struct mlxsw_reg_info *reg,
                                     char *payload,
                                     enum mlxsw_core_reg_access_type type)
{
        enum mlxsw_emad_op_tlv_status status;
        int err, n_retry;
        char *in_mbox, *out_mbox, *tmp;

        dev_dbg(mlxsw_core->bus_info->dev, "Reg cmd access (reg_id=%x(%s),type=%s)\n",
                reg->id, mlxsw_reg_id_str(reg->id),
                mlxsw_core_reg_access_type_str(type));

        in_mbox = mlxsw_cmd_mbox_alloc();
        if (!in_mbox)
                return -ENOMEM;

        out_mbox = mlxsw_cmd_mbox_alloc();
        if (!out_mbox) {
                err = -ENOMEM;
                goto free_in_mbox;
        }

        mlxsw_emad_pack_op_tlv(in_mbox, reg, type,
                               mlxsw_core_tid_get(mlxsw_core));
        tmp = in_mbox + MLXSW_EMAD_OP_TLV_LEN * sizeof(u32);
        mlxsw_emad_pack_reg_tlv(tmp, reg, payload);

        n_retry = 0;
retry:
        err = mlxsw_cmd_access_reg(mlxsw_core, in_mbox, out_mbox);
        if (!err) {
                err = mlxsw_emad_process_status(out_mbox, &status);
                if (err) {
                        if (err == -EAGAIN && n_retry++ < MLXSW_EMAD_MAX_RETRY)
                                goto retry;
                        dev_err(mlxsw_core->bus_info->dev, "Reg cmd access status failed (status=%x(%s))\n",
                                status, mlxsw_emad_op_tlv_status_str(status));
                }
        }

        if (!err)
                memcpy(payload, mlxsw_emad_reg_payload(out_mbox),
                       reg->len);

        mlxsw_cmd_mbox_free(out_mbox);
free_in_mbox:
        mlxsw_cmd_mbox_free(in_mbox);
        if (err)
                dev_err(mlxsw_core->bus_info->dev, "Reg cmd access failed (reg_id=%x(%s),type=%s)\n",
                        reg->id, mlxsw_reg_id_str(reg->id),
                        mlxsw_core_reg_access_type_str(type));
        return err;
}

static void mlxsw_core_reg_access_cb(struct mlxsw_core *mlxsw_core,
                                     char *payload, size_t payload_len,
                                     unsigned long cb_priv)
{
        char *orig_payload = (char *) cb_priv;

        memcpy(orig_payload, payload, payload_len);
}

static int mlxsw_core_reg_access(struct mlxsw_core *mlxsw_core,
                                 const struct mlxsw_reg_info *reg,
                                 char *payload,
                                 enum mlxsw_core_reg_access_type type)
{
        LIST_HEAD(bulk_list);
        int err;

        /* During initialization EMAD interface is not available to us,
         * so we default to command interface. We switch to EMAD interface
         * after setting the appropriate traps.
         */
        if (!mlxsw_core->emad.use_emad)
                return mlxsw_core_reg_access_cmd(mlxsw_core, reg,
                                                 payload, type);

        err = mlxsw_core_reg_access_emad(mlxsw_core, reg,
                                         payload, type, &bulk_list,
                                         mlxsw_core_reg_access_cb,
                                         (unsigned long) payload);
        if (err)
                return err;
        return mlxsw_reg_trans_bulk_wait(&bulk_list);
}

int mlxsw_reg_query(struct mlxsw_core *mlxsw_core,
                    const struct mlxsw_reg_info *reg, char *payload)
{
        return mlxsw_core_reg_access(mlxsw_core, reg, payload,
                                     MLXSW_CORE_REG_ACCESS_TYPE_QUERY);
}
EXPORT_SYMBOL(mlxsw_reg_query);

int mlxsw_reg_write(struct mlxsw_core *mlxsw_core,
                    const struct mlxsw_reg_info *reg, char *payload)
{
        return mlxsw_core_reg_access(mlxsw_core, reg, payload,
                                     MLXSW_CORE_REG_ACCESS_TYPE_WRITE);
}
EXPORT_SYMBOL(mlxsw_reg_write);

void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
                            struct mlxsw_rx_info *rx_info)
{
        struct mlxsw_rx_listener_item *rxl_item;
        const struct mlxsw_rx_listener *rxl;
        u8 local_port;
        bool found = false;

        if (rx_info->is_lag) {
                dev_dbg_ratelimited(mlxsw_core->bus_info->dev, "%s: lag_id = %d, lag_port_index = 0x%x\n",
                                    __func__, rx_info->u.lag_id,
                                    rx_info->trap_id);
                /* Upper layer does not care if the skb came from LAG or not,
                 * so just get the local_port for the lag port and push it up.
                 */
                local_port = mlxsw_core_lag_mapping_get(mlxsw_core,
                                                        rx_info->u.lag_id,
                                                        rx_info->lag_port_index);
        } else {
                local_port = rx_info->u.sys_port;
        }

        dev_dbg_ratelimited(mlxsw_core->bus_info->dev, "%s: local_port = %d, trap_id = 0x%x\n",
                            __func__, local_port, rx_info->trap_id);

        if ((rx_info->trap_id >= MLXSW_TRAP_ID_MAX) ||
            (local_port >= mlxsw_core->max_ports))
                goto drop;

        rcu_read_lock();
        list_for_each_entry_rcu(rxl_item, &mlxsw_core->rx_listener_list, list) {
                rxl = &rxl_item->rxl;
                if ((rxl->local_port == MLXSW_PORT_DONT_CARE ||
                     rxl->local_port == local_port) &&
                    rxl->trap_id == rx_info->trap_id) {
                        found = true;
                        break;
                }
        }
        rcu_read_unlock();
        if (!found)
                goto drop;

        rxl->func(skb, local_port, rxl_item->priv);
        return;

drop:
        dev_kfree_skb(skb);
}
EXPORT_SYMBOL(mlxsw_core_skb_receive);

static int mlxsw_core_lag_mapping_index(struct mlxsw_core *mlxsw_core,
                                        u16 lag_id, u8 port_index)
{
        return MLXSW_CORE_RES_GET(mlxsw_core, MAX_LAG_MEMBERS) * lag_id +
               port_index;
}

void mlxsw_core_lag_mapping_set(struct mlxsw_core *mlxsw_core,
                                u16 lag_id, u8 port_index, u8 local_port)
{
        int index = mlxsw_core_lag_mapping_index(mlxsw_core,
                                                 lag_id, port_index);

        mlxsw_core->lag.mapping[index] = local_port;
}
EXPORT_SYMBOL(mlxsw_core_lag_mapping_set);

u8 mlxsw_core_lag_mapping_get(struct mlxsw_core *mlxsw_core,
                              u16 lag_id, u8 port_index)
{
        int index = mlxsw_core_lag_mapping_index(mlxsw_core,
                                                 lag_id, port_index);

        return mlxsw_core->lag.mapping[index];
}
EXPORT_SYMBOL(mlxsw_core_lag_mapping_get);

void mlxsw_core_lag_mapping_clear(struct mlxsw_core *mlxsw_core,
                                  u16 lag_id, u8 local_port)
{
        int i;

        for (i = 0; i < MLXSW_CORE_RES_GET(mlxsw_core, MAX_LAG_MEMBERS); i++) {
                int index = mlxsw_core_lag_mapping_index(mlxsw_core,
                                                         lag_id, i);

                if (mlxsw_core->lag.mapping[index] == local_port)
                        mlxsw_core->lag.mapping[index] = 0;
        }
}
EXPORT_SYMBOL(mlxsw_core_lag_mapping_clear);

bool mlxsw_core_res_valid(struct mlxsw_core *mlxsw_core,
                          enum mlxsw_res_id res_id)
{
        return mlxsw_res_valid(&mlxsw_core->res, res_id);
}
EXPORT_SYMBOL(mlxsw_core_res_valid);

u64 mlxsw_core_res_get(struct mlxsw_core *mlxsw_core,
                       enum mlxsw_res_id res_id)
{
        return mlxsw_res_get(&mlxsw_core->res, res_id);
}
EXPORT_SYMBOL(mlxsw_core_res_get);

int mlxsw_core_port_init(struct mlxsw_core *mlxsw_core, u8 local_port)
{
        struct devlink *devlink = priv_to_devlink(mlxsw_core);
        struct mlxsw_core_port *mlxsw_core_port =
                                        &mlxsw_core->ports[local_port];
        struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;
        int err;

        mlxsw_core_port->local_port = local_port;
        err = devlink_port_register(devlink, devlink_port, local_port);
        if (err)
                memset(mlxsw_core_port, 0, sizeof(*mlxsw_core_port));
        return err;
}
EXPORT_SYMBOL(mlxsw_core_port_init);

void mlxsw_core_port_fini(struct mlxsw_core *mlxsw_core, u8 local_port)
{
        struct mlxsw_core_port *mlxsw_core_port =
                                        &mlxsw_core->ports[local_port];
        struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;

        devlink_port_unregister(devlink_port);
        memset(mlxsw_core_port, 0, sizeof(*mlxsw_core_port));
}
EXPORT_SYMBOL(mlxsw_core_port_fini);

void mlxsw_core_port_eth_set(struct mlxsw_core *mlxsw_core, u8 local_port,
                             void *port_driver_priv, struct net_device *dev,
                             bool split, u32 split_group)
{
        struct mlxsw_core_port *mlxsw_core_port =
                                        &mlxsw_core->ports[local_port];
        struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;

        mlxsw_core_port->port_driver_priv = port_driver_priv;
        if (split)
                devlink_port_split_set(devlink_port, split_group);
        devlink_port_type_eth_set(devlink_port, dev);
}
EXPORT_SYMBOL(mlxsw_core_port_eth_set);

void mlxsw_core_port_ib_set(struct mlxsw_core *mlxsw_core, u8 local_port,
                            void *port_driver_priv)
{
        struct mlxsw_core_port *mlxsw_core_port =
                                        &mlxsw_core->ports[local_port];
        struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;

        mlxsw_core_port->port_driver_priv = port_driver_priv;
        devlink_port_type_ib_set(devlink_port, NULL);
}
EXPORT_SYMBOL(mlxsw_core_port_ib_set);

void mlxsw_core_port_clear(struct mlxsw_core *mlxsw_core, u8 local_port,
                           void *port_driver_priv)
{
        struct mlxsw_core_port *mlxsw_core_port =
                                        &mlxsw_core->ports[local_port];
        struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;

        mlxsw_core_port->port_driver_priv = port_driver_priv;
        devlink_port_type_clear(devlink_port);
}
EXPORT_SYMBOL(mlxsw_core_port_clear);

enum devlink_port_type mlxsw_core_port_type_get(struct mlxsw_core *mlxsw_core,
                                                u8 local_port)
{
        struct mlxsw_core_port *mlxsw_core_port =
                                        &mlxsw_core->ports[local_port];
        struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;

        return devlink_port->type;
}
EXPORT_SYMBOL(mlxsw_core_port_type_get);

static void mlxsw_core_buf_dump_dbg(struct mlxsw_core *mlxsw_core,
                                    const char *buf, size_t size)
{
        __be32 *m = (__be32 *) buf;
        int i;
        int count = size / sizeof(__be32);

        for (i = count - 1; i >= 0; i--)
                if (m[i])
                        break;
        i++;
        count = i ? i : 1;
        for (i = 0; i < count; i += 4)
                dev_dbg(mlxsw_core->bus_info->dev, "%04x - %08x %08x %08x %08x\n",
                        i * 4, be32_to_cpu(m[i]), be32_to_cpu(m[i + 1]),
                        be32_to_cpu(m[i + 2]), be32_to_cpu(m[i + 3]));
}

int mlxsw_cmd_exec(struct mlxsw_core *mlxsw_core, u16 opcode, u8 opcode_mod,
                   u32 in_mod, bool out_mbox_direct,
                   char *in_mbox, size_t in_mbox_size,
                   char *out_mbox, size_t out_mbox_size)
{
        u8 status;
        int err;

        BUG_ON(in_mbox_size % sizeof(u32) || out_mbox_size % sizeof(u32));
        if (!mlxsw_core->bus->cmd_exec)
                return -EOPNOTSUPP;

        dev_dbg(mlxsw_core->bus_info->dev, "Cmd exec (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n",
                opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod, in_mod);
        if (in_mbox) {
                dev_dbg(mlxsw_core->bus_info->dev, "Input mailbox:\n");
                mlxsw_core_buf_dump_dbg(mlxsw_core, in_mbox, in_mbox_size);
        }

        err = mlxsw_core->bus->cmd_exec(mlxsw_core->bus_priv, opcode,
                                        opcode_mod, in_mod, out_mbox_direct,
                                        in_mbox, in_mbox_size,
                                        out_mbox, out_mbox_size, &status);

        if (err == -EIO && status != MLXSW_CMD_STATUS_OK) {
                dev_err(mlxsw_core->bus_info->dev, "Cmd exec failed (opcode=%x(%s),opcode_mod=%x,in_mod=%x,status=%x(%s))\n",
                        opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod,
                        in_mod, status, mlxsw_cmd_status_str(status));
        } else if (err == -ETIMEDOUT) {
                dev_err(mlxsw_core->bus_info->dev, "Cmd exec timed-out (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n",
                        opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod,
                        in_mod);
        }

        if (!err && out_mbox) {
                dev_dbg(mlxsw_core->bus_info->dev, "Output mailbox:\n");
                mlxsw_core_buf_dump_dbg(mlxsw_core, out_mbox, out_mbox_size);
        }
        return err;
}
EXPORT_SYMBOL(mlxsw_cmd_exec);

int mlxsw_core_schedule_dw(struct delayed_work *dwork, unsigned long delay)
{
        return queue_delayed_work(mlxsw_wq, dwork, delay);
}
EXPORT_SYMBOL(mlxsw_core_schedule_dw);

bool mlxsw_core_schedule_work(struct work_struct *work)
{
        return queue_work(mlxsw_owq, work);
}
EXPORT_SYMBOL(mlxsw_core_schedule_work);

void mlxsw_core_flush_owq(void)
{
        flush_workqueue(mlxsw_owq);
}
EXPORT_SYMBOL(mlxsw_core_flush_owq);

static int __init mlxsw_core_module_init(void)
{
        int err;

        mlxsw_wq = alloc_workqueue(mlxsw_core_driver_name, WQ_MEM_RECLAIM, 0);
        if (!mlxsw_wq)
                return -ENOMEM;
        mlxsw_owq = alloc_ordered_workqueue("%s_ordered", WQ_MEM_RECLAIM,
                                            mlxsw_core_driver_name);
        if (!mlxsw_owq) {
                err = -ENOMEM;
                goto err_alloc_ordered_workqueue;
        }
        return 0;

err_alloc_ordered_workqueue:
        destroy_workqueue(mlxsw_wq);
        return err;
}

static void __exit mlxsw_core_module_exit(void)
{
        destroy_workqueue(mlxsw_owq);
        destroy_workqueue(mlxsw_wq);
}

module_init(mlxsw_core_module_init);
module_exit(mlxsw_core_module_exit);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
MODULE_DESCRIPTION("Mellanox switch device core driver");