core.c 45.1 KB
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/*
 * 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/debugfs.h>
#include <linux/seq_file.h>
#include <linux/u64_stats_sync.h>
#include <linux/netdevice.h>
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#include <linux/wait.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 <asm/byteorder.h>
J
Jiri Pirko 已提交
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#include <net/devlink.h>
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#include "core.h"
#include "item.h"
#include "cmd.h"
#include "port.h"
#include "trap.h"
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#include "emad.h"
#include "reg.h"
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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 dentry *mlxsw_core_dbg_root;

struct mlxsw_core_pcpu_stats {
	u64			trap_rx_packets[MLXSW_TRAP_ID_MAX];
	u64			trap_rx_bytes[MLXSW_TRAP_ID_MAX];
	u64			port_rx_packets[MLXSW_PORT_MAX_PORTS];
	u64			port_rx_bytes[MLXSW_PORT_MAX_PORTS];
	struct u64_stats_sync	syncp;
	u32			trap_rx_dropped[MLXSW_TRAP_ID_MAX];
	u32			port_rx_dropped[MLXSW_PORT_MAX_PORTS];
	u32			trap_rx_invalid;
	u32			port_rx_invalid;
};

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;
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	struct list_head event_listener_list;
	struct {
		struct sk_buff *resp_skb;
		u64 tid;
		wait_queue_head_t wait;
		bool trans_active;
		struct mutex lock; /* One EMAD transaction at a time. */
		bool use_emad;
	} emad;
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	struct mlxsw_core_pcpu_stats __percpu *pcpu_stats;
	struct dentry *dbg_dir;
	struct {
		struct debugfs_blob_wrapper vsd_blob;
		struct debugfs_blob_wrapper psid_blob;
	} dbg;
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	struct {
		u8 *mapping; /* lag_id+port_index to local_port mapping */
	} lag;
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	struct mlxsw_hwmon *hwmon;
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	unsigned long driver_priv[0];
	/* driver_priv has to be always the last item */
};

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

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

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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,
				   struct mlxsw_core *mlxsw_core)
{
	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);
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	if (type == MLXSW_CORE_REG_ACCESS_TYPE_QUERY)
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		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, mlxsw_core->emad.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,
				 struct mlxsw_core *mlxsw_core)
{
	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, mlxsw_core);

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

#define MLXSW_EMAD_TIMEOUT_MS 200

static int __mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core,
				 struct sk_buff *skb,
				 const struct mlxsw_tx_info *tx_info)
{
	int err;
	int ret;

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	mlxsw_core->emad.trans_active = true;

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	err = mlxsw_core_skb_transmit(mlxsw_core, skb, tx_info);
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	if (err) {
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		dev_err(mlxsw_core->bus_info->dev, "Failed to transmit EMAD (tid=%llx)\n",
			mlxsw_core->emad.tid);
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		dev_kfree_skb(skb);
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		goto trans_inactive_out;
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	}

	ret = wait_event_timeout(mlxsw_core->emad.wait,
				 !(mlxsw_core->emad.trans_active),
				 msecs_to_jiffies(MLXSW_EMAD_TIMEOUT_MS));
	if (!ret) {
		dev_warn(mlxsw_core->bus_info->dev, "EMAD timed-out (tid=%llx)\n",
			 mlxsw_core->emad.tid);
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		err = -EIO;
		goto trans_inactive_out;
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	}

	return 0;
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trans_inactive_out:
	mlxsw_core->emad.trans_active = false;
	return err;
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}

static int mlxsw_emad_process_status(struct mlxsw_core *mlxsw_core,
				     char *op_tlv)
{
	enum mlxsw_emad_op_tlv_status status;
	u64 tid;

	status = mlxsw_emad_op_tlv_status_get(op_tlv);
	tid = mlxsw_emad_op_tlv_tid_get(op_tlv);

	switch (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:
		dev_warn(mlxsw_core->bus_info->dev, "Reg access status again (tid=%llx,status=%x(%s))\n",
			 tid, status, mlxsw_emad_op_tlv_status_str(status));
		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:
		dev_err(mlxsw_core->bus_info->dev, "Reg access status failed (tid=%llx,status=%x(%s))\n",
			tid, status, mlxsw_emad_op_tlv_status_str(status));
		return -EIO;
	}
}

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

static int mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core,
			       struct sk_buff *skb,
			       const struct mlxsw_tx_info *tx_info)
{
	struct sk_buff *trans_skb;
	int n_retry;
	int err;

	n_retry = 0;
retry:
	/* We copy the EMAD to a new skb, since we might need
	 * to retransmit it in case of failure.
	 */
	trans_skb = skb_copy(skb, GFP_KERNEL);
	if (!trans_skb) {
		err = -ENOMEM;
		goto out;
	}

	err = __mlxsw_emad_transmit(mlxsw_core, trans_skb, tx_info);
	if (!err) {
		struct sk_buff *resp_skb = mlxsw_core->emad.resp_skb;

		err = mlxsw_emad_process_status_skb(mlxsw_core, resp_skb);
		if (err)
			dev_kfree_skb(resp_skb);
		if (!err || err != -EAGAIN)
			goto out;
	}
	if (n_retry++ < MLXSW_EMAD_MAX_RETRY)
		goto retry;

out:
	dev_kfree_skb(skb);
	mlxsw_core->emad.tid++;
	return err;
}

static void mlxsw_emad_rx_listener_func(struct sk_buff *skb, u8 local_port,
					void *priv)
{
	struct mlxsw_core *mlxsw_core = priv;

	if (mlxsw_emad_is_resp(skb) &&
	    mlxsw_core->emad.trans_active &&
	    mlxsw_emad_get_tid(skb) == mlxsw_core->emad.tid) {
		mlxsw_core->emad.resp_skb = skb;
		mlxsw_core->emad.trans_active = false;
		wake_up(&mlxsw_core->emad.wait);
	} else {
		dev_kfree_skb(skb);
	}
}

static const struct mlxsw_rx_listener mlxsw_emad_rx_listener = {
	.func = mlxsw_emad_rx_listener_func,
	.local_port = MLXSW_PORT_DONT_CARE,
	.trap_id = MLXSW_TRAP_ID_ETHEMAD,
};

static int mlxsw_emad_traps_set(struct mlxsw_core *mlxsw_core)
{
	char htgt_pl[MLXSW_REG_HTGT_LEN];
	char hpkt_pl[MLXSW_REG_HPKT_LEN];
	int err;

	mlxsw_reg_htgt_pack(htgt_pl, MLXSW_REG_HTGT_TRAP_GROUP_EMAD);
	err = mlxsw_reg_write(mlxsw_core, MLXSW_REG(htgt), htgt_pl);
	if (err)
		return err;

	mlxsw_reg_hpkt_pack(hpkt_pl, MLXSW_REG_HPKT_ACTION_TRAP_TO_CPU,
			    MLXSW_TRAP_ID_ETHEMAD);
	return mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl);
}

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

	/* 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(&mlxsw_core->emad.tid, 4);
	mlxsw_core->emad.tid = mlxsw_core->emad.tid << 32;

	init_waitqueue_head(&mlxsw_core->emad.wait);
	mlxsw_core->emad.trans_active = false;
	mutex_init(&mlxsw_core->emad.lock);

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

	err = mlxsw_emad_traps_set(mlxsw_core);
	if (err)
		goto err_emad_trap_set;

	mlxsw_core->emad.use_emad = true;

	return 0;

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

static void mlxsw_emad_fini(struct mlxsw_core *mlxsw_core)
{
	char hpkt_pl[MLXSW_REG_HPKT_LEN];

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	mlxsw_core->emad.use_emad = false;
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	mlxsw_reg_hpkt_pack(hpkt_pl, MLXSW_REG_HPKT_ACTION_DISCARD,
			    MLXSW_TRAP_ID_ETHEMAD);
	mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl);

	mlxsw_core_rx_listener_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;
}

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

static int mlxsw_core_rx_stats_dbg_read(struct seq_file *file, void *data)
{
	struct mlxsw_core *mlxsw_core = file->private;
	struct mlxsw_core_pcpu_stats *p;
	u64 rx_packets, rx_bytes;
	u64 tmp_rx_packets, tmp_rx_bytes;
	u32 rx_dropped, rx_invalid;
	unsigned int start;
	int i;
	int j;
	static const char hdr[] =
		"     NUM   RX_PACKETS     RX_BYTES RX_DROPPED\n";

	seq_printf(file, hdr);
	for (i = 0; i < MLXSW_TRAP_ID_MAX; i++) {
		rx_packets = 0;
		rx_bytes = 0;
		rx_dropped = 0;
		for_each_possible_cpu(j) {
			p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
			do {
				start = u64_stats_fetch_begin(&p->syncp);
				tmp_rx_packets = p->trap_rx_packets[i];
				tmp_rx_bytes = p->trap_rx_bytes[i];
			} while (u64_stats_fetch_retry(&p->syncp, start));

			rx_packets += tmp_rx_packets;
			rx_bytes += tmp_rx_bytes;
			rx_dropped += p->trap_rx_dropped[i];
		}
		seq_printf(file, "trap %3d %12llu %12llu %10u\n",
			   i, rx_packets, rx_bytes, rx_dropped);
	}
	rx_invalid = 0;
	for_each_possible_cpu(j) {
		p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
		rx_invalid += p->trap_rx_invalid;
	}
	seq_printf(file, "trap INV                           %10u\n",
		   rx_invalid);

	for (i = 0; i < MLXSW_PORT_MAX_PORTS; i++) {
		rx_packets = 0;
		rx_bytes = 0;
		rx_dropped = 0;
		for_each_possible_cpu(j) {
			p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
			do {
				start = u64_stats_fetch_begin(&p->syncp);
				tmp_rx_packets = p->port_rx_packets[i];
				tmp_rx_bytes = p->port_rx_bytes[i];
			} while (u64_stats_fetch_retry(&p->syncp, start));

			rx_packets += tmp_rx_packets;
			rx_bytes += tmp_rx_bytes;
			rx_dropped += p->port_rx_dropped[i];
		}
		seq_printf(file, "port %3d %12llu %12llu %10u\n",
			   i, rx_packets, rx_bytes, rx_dropped);
	}
	rx_invalid = 0;
	for_each_possible_cpu(j) {
		p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
		rx_invalid += p->port_rx_invalid;
	}
	seq_printf(file, "port INV                           %10u\n",
		   rx_invalid);
	return 0;
}

static int mlxsw_core_rx_stats_dbg_open(struct inode *inode, struct file *f)
{
	struct mlxsw_core *mlxsw_core = inode->i_private;

	return single_open(f, mlxsw_core_rx_stats_dbg_read, mlxsw_core);
}

static const struct file_operations mlxsw_core_rx_stats_dbg_ops = {
	.owner = THIS_MODULE,
	.open = mlxsw_core_rx_stats_dbg_open,
	.release = single_release,
	.read = seq_read,
	.llseek = seq_lseek
};

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_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);
	if (!mlxsw_driver) {
		spin_unlock(&mlxsw_core_driver_list_lock);
		request_module(MLXSW_MODULE_ALIAS_PREFIX "%s", kind);
		spin_lock(&mlxsw_core_driver_list_lock);
		mlxsw_driver = __driver_find(kind);
	}
	if (mlxsw_driver) {
		if (!try_module_get(mlxsw_driver->owner))
			mlxsw_driver = NULL;
	}

	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);
	if (!mlxsw_driver)
		return;
	module_put(mlxsw_driver->owner);
}

static int mlxsw_core_debugfs_init(struct mlxsw_core *mlxsw_core)
{
	const struct mlxsw_bus_info *bus_info = mlxsw_core->bus_info;

	mlxsw_core->dbg_dir = debugfs_create_dir(bus_info->device_name,
						 mlxsw_core_dbg_root);
	if (!mlxsw_core->dbg_dir)
		return -ENOMEM;
	debugfs_create_file("rx_stats", S_IRUGO, mlxsw_core->dbg_dir,
			    mlxsw_core, &mlxsw_core_rx_stats_dbg_ops);
	mlxsw_core->dbg.vsd_blob.data = (void *) &bus_info->vsd;
	mlxsw_core->dbg.vsd_blob.size = sizeof(bus_info->vsd);
	debugfs_create_blob("vsd", S_IRUGO, mlxsw_core->dbg_dir,
			    &mlxsw_core->dbg.vsd_blob);
	mlxsw_core->dbg.psid_blob.data = (void *) &bus_info->psid;
	mlxsw_core->dbg.psid_blob.size = sizeof(bus_info->psid);
	debugfs_create_blob("psid", S_IRUGO, mlxsw_core->dbg_dir,
			    &mlxsw_core->dbg.psid_blob);
	return 0;
}

static void mlxsw_core_debugfs_fini(struct mlxsw_core *mlxsw_core)
{
	debugfs_remove_recursive(mlxsw_core->dbg_dir);
}

794 795 796 797 798 799 800 801 802 803
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_PORT_MAX_PORTS)
		return -EINVAL;
	if (!mlxsw_core->driver->port_split)
		return -EOPNOTSUPP;
804
	return mlxsw_core->driver->port_split(mlxsw_core, port_index, count);
805 806 807 808 809 810 811 812 813 814 815
}

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_PORT_MAX_PORTS)
		return -EINVAL;
	if (!mlxsw_core->driver->port_unsplit)
		return -EOPNOTSUPP;
816
	return mlxsw_core->driver->port_unsplit(mlxsw_core, port_index);
817 818
}

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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_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)
		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)
		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)
		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)
		return -EOPNOTSUPP;
	return mlxsw_driver->sb_tc_pool_bind_set(mlxsw_core_port, sb_index,
						 tc_index, pool_type,
						 pool_index, threshold);
}

914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
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)
		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)
		return -EOPNOTSUPP;
	return mlxsw_driver->sb_occ_tc_port_bind_get(mlxsw_core_port,
						     sb_index, tc_index,
						     pool_type, p_cur, p_max);
}

968
static const struct devlink_ops mlxsw_devlink_ops = {
969 970 971 972 973 974 975 976 977 978 979 980
	.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,
981 982
};

983 984 985 986 987 988 989
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;
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	struct devlink *devlink;
991 992 993 994 995 996 997
	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;
998
	devlink = devlink_alloc(&mlxsw_devlink_ops, alloc_size);
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999
	if (!devlink) {
1000
		err = -ENOMEM;
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1001
		goto err_devlink_alloc;
1002 1003
	}

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1004
	mlxsw_core = devlink_priv(devlink);
1005
	INIT_LIST_HEAD(&mlxsw_core->rx_listener_list);
1006
	INIT_LIST_HEAD(&mlxsw_core->event_listener_list);
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
	mlxsw_core->driver = mlxsw_driver;
	mlxsw_core->bus = mlxsw_bus;
	mlxsw_core->bus_priv = bus_priv;
	mlxsw_core->bus_info = mlxsw_bus_info;

	mlxsw_core->pcpu_stats =
		netdev_alloc_pcpu_stats(struct mlxsw_core_pcpu_stats);
	if (!mlxsw_core->pcpu_stats) {
		err = -ENOMEM;
		goto err_alloc_stats;
	}
1018

1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
	if (mlxsw_driver->profile->used_max_lag &&
	    mlxsw_driver->profile->used_max_port_per_lag) {
		alloc_size = sizeof(u8) * mlxsw_driver->profile->max_lag *
			     mlxsw_driver->profile->max_port_per_lag;
		mlxsw_core->lag.mapping = kzalloc(alloc_size, GFP_KERNEL);
		if (!mlxsw_core->lag.mapping) {
			err = -ENOMEM;
			goto err_alloc_lag_mapping;
		}
	}

1030 1031 1032 1033
	err = mlxsw_bus->init(bus_priv, mlxsw_core, mlxsw_driver->profile);
	if (err)
		goto err_bus_init;

1034 1035 1036 1037
	err = mlxsw_emad_init(mlxsw_core);
	if (err)
		goto err_emad_init;

1038 1039 1040 1041
	err = mlxsw_hwmon_init(mlxsw_core, mlxsw_bus_info, &mlxsw_core->hwmon);
	if (err)
		goto err_hwmon_init;

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

1046
	err = mlxsw_driver->init(mlxsw_core, mlxsw_bus_info);
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056
	if (err)
		goto err_driver_init;

	err = mlxsw_core_debugfs_init(mlxsw_core);
	if (err)
		goto err_debugfs_init;

	return 0;

err_debugfs_init:
1057
	mlxsw_core->driver->fini(mlxsw_core);
1058
err_driver_init:
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	devlink_unregister(devlink);
err_devlink_register:
1061
err_hwmon_init:
1062 1063
	mlxsw_emad_fini(mlxsw_core);
err_emad_init:
1064 1065
	mlxsw_bus->fini(bus_priv);
err_bus_init:
1066 1067
	kfree(mlxsw_core->lag.mapping);
err_alloc_lag_mapping:
1068 1069
	free_percpu(mlxsw_core->pcpu_stats);
err_alloc_stats:
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	devlink_free(devlink);
err_devlink_alloc:
1072 1073 1074 1075 1076 1077 1078 1079
	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;
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	struct devlink *devlink = priv_to_devlink(mlxsw_core);
1081 1082

	mlxsw_core_debugfs_fini(mlxsw_core);
1083
	mlxsw_core->driver->fini(mlxsw_core);
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1084
	devlink_unregister(devlink);
1085
	mlxsw_emad_fini(mlxsw_core);
1086
	mlxsw_core->bus->fini(mlxsw_core->bus_priv);
1087
	kfree(mlxsw_core->lag.mapping);
1088
	free_percpu(mlxsw_core->pcpu_stats);
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	devlink_free(devlink);
1090 1091 1092 1093
	mlxsw_core_driver_put(device_kind);
}
EXPORT_SYMBOL(mlxsw_core_bus_device_unregister);

1094
bool mlxsw_core_skb_transmit_busy(struct mlxsw_core *mlxsw_core,
1095 1096 1097 1098 1099 1100 1101
				  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);

1102
int mlxsw_core_skb_transmit(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
			    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);

1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
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_reg_access_emad(struct mlxsw_core *mlxsw_core,
				      const struct mlxsw_reg_info *reg,
				      char *payload,
				      enum mlxsw_core_reg_access_type type)
{
	int err;
	char *op_tlv;
	struct sk_buff *skb;
	struct mlxsw_tx_info tx_info = {
		.local_port = MLXSW_PORT_CPU_PORT,
		.is_emad = true,
	};

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

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

	dev_dbg(mlxsw_core->bus_info->dev, "EMAD send (tid=%llx)\n",
		mlxsw_core->emad.tid);
	mlxsw_core_buf_dump_dbg(mlxsw_core, skb->data, skb->len);

	err = mlxsw_emad_transmit(mlxsw_core, skb, &tx_info);
	if (!err) {
		op_tlv = mlxsw_emad_op_tlv(mlxsw_core->emad.resp_skb);
		memcpy(payload, mlxsw_emad_reg_payload(op_tlv),
		       reg->len);

		dev_dbg(mlxsw_core->bus_info->dev, "EMAD recv (tid=%llx)\n",
			mlxsw_core->emad.tid - 1);
		mlxsw_core_buf_dump_dbg(mlxsw_core,
					mlxsw_core->emad.resp_skb->data,
1298
					mlxsw_core->emad.resp_skb->len);
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403

		dev_kfree_skb(mlxsw_core->emad.resp_skb);
	}

	return err;
}

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)
{
	int err, n_retry;
	char *in_mbox, *out_mbox, *tmp;

	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);
	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(mlxsw_core, out_mbox);
		if (err == -EAGAIN && n_retry++ < MLXSW_EMAD_MAX_RETRY)
			goto retry;
	}

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

	mlxsw_core->emad.tid++;
	mlxsw_cmd_mbox_free(out_mbox);
free_in_mbox:
	mlxsw_cmd_mbox_free(in_mbox);
	return err;
}

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)
{
	u64 cur_tid;
	int err;

	if (mutex_lock_interruptible(&mlxsw_core->emad.lock)) {
		dev_err(mlxsw_core->bus_info->dev, "Reg access interrupted (reg_id=%x(%s),type=%s)\n",
			reg->id, mlxsw_reg_id_str(reg->id),
			mlxsw_core_reg_access_type_str(type));
		return -EINTR;
	}

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

	/* 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)
		err = mlxsw_core_reg_access_cmd(mlxsw_core, reg,
						payload, type);
	else
		err = mlxsw_core_reg_access_emad(mlxsw_core, reg,
						 payload, type);

	if (err)
		dev_err(mlxsw_core->bus_info->dev, "Reg access failed (tid=%llx,reg_id=%x(%s),type=%s)\n",
			cur_tid, reg->id, mlxsw_reg_id_str(reg->id),
			mlxsw_core_reg_access_type_str(type));

	mutex_unlock(&mlxsw_core->emad.lock);
	return err;
}

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);

1404 1405 1406 1407 1408 1409
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;
	struct mlxsw_core_pcpu_stats *pcpu_stats;
1410
	u8 local_port;
1411 1412
	bool found = false;

1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
	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);
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	if ((rx_info->trap_id >= MLXSW_TRAP_ID_MAX) ||
	    (local_port >= MLXSW_PORT_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;

	pcpu_stats = this_cpu_ptr(mlxsw_core->pcpu_stats);
	u64_stats_update_begin(&pcpu_stats->syncp);
	pcpu_stats->port_rx_packets[local_port]++;
	pcpu_stats->port_rx_bytes[local_port] += skb->len;
	pcpu_stats->trap_rx_packets[rx_info->trap_id]++;
	pcpu_stats->trap_rx_bytes[rx_info->trap_id] += skb->len;
	u64_stats_update_end(&pcpu_stats->syncp);

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

drop:
	if (rx_info->trap_id >= MLXSW_TRAP_ID_MAX)
		this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_invalid);
	else
		this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_dropped[rx_info->trap_id]);
	if (local_port >= MLXSW_PORT_MAX_PORTS)
		this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_invalid);
	else
		this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_dropped[local_port]);
	dev_kfree_skb(skb);
}
EXPORT_SYMBOL(mlxsw_core_skb_receive);

1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
static int mlxsw_core_lag_mapping_index(struct mlxsw_core *mlxsw_core,
					u16 lag_id, u8 port_index)
{
	return mlxsw_core->driver->profile->max_port_per_lag * 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->driver->profile->max_port_per_lag; 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);

1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
int mlxsw_core_port_init(struct mlxsw_core *mlxsw_core,
			 struct mlxsw_core_port *mlxsw_core_port, u8 local_port,
			 struct net_device *dev, bool split, u32 split_group)
{
	struct devlink *devlink = priv_to_devlink(mlxsw_core);
	struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;

	if (split)
		devlink_port_split_set(devlink_port, split_group);
	devlink_port_type_eth_set(devlink_port, dev);
	return devlink_port_register(devlink, devlink_port, local_port);
}
EXPORT_SYMBOL(mlxsw_core_port_init);

void mlxsw_core_port_fini(struct mlxsw_core_port *mlxsw_core_port)
{
	struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;

	devlink_port_unregister(devlink_port);
}
EXPORT_SYMBOL(mlxsw_core_port_fini);

1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596
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);

static int __init mlxsw_core_module_init(void)
{
	mlxsw_core_dbg_root = debugfs_create_dir(mlxsw_core_driver_name, NULL);
	if (!mlxsw_core_dbg_root)
		return -ENOMEM;
	return 0;
}

static void __exit mlxsw_core_module_exit(void)
{
	debugfs_remove_recursive(mlxsw_core_dbg_root);
}

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");