drivers/net/ethernet/mellanox/mlxsw/core.c

   1 /*
   2  * drivers/net/ethernet/mellanox/mlxsw/core.c
   3  * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
   4  * Copyright (c) 2015 Jiri Pirko <jiri@mellanox.com>
   5  * Copyright (c) 2015 Ido Schimmel <idosch@mellanox.com>
   6  * Copyright (c) 2015 Elad Raz <eladr@mellanox.com>
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include <linux/kernel.h>
  38 #include <linux/module.h>
  39 #include <linux/device.h>
  40 #include <linux/export.h>
  41 #include <linux/err.h>
  42 #include <linux/if_link.h>
  43 #include <linux/debugfs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/u64_stats_sync.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/wait.h>
  48 #include <linux/skbuff.h>
  49 #include <linux/etherdevice.h>
  50 #include <linux/types.h>
  51 #include <linux/string.h>
  52 #include <linux/gfp.h>
  53 #include <linux/random.h>
  54 #include <linux/jiffies.h>
  55 #include <linux/mutex.h>
  56 #include <linux/rcupdate.h>
  57 #include <linux/slab.h>
  58 #include <linux/workqueue.h>
  59 #include <asm/byteorder.h>
  60 #include <net/devlink.h>
  61
  62 #include "core.h"
  63 #include "item.h"
  64 #include "cmd.h"
  65 #include "port.h"
  66 #include "trap.h"
  67 #include "emad.h"
  68 #include "reg.h"
  69
  70 static LIST_HEAD(mlxsw_core_driver_list);
  71 static DEFINE_SPINLOCK(mlxsw_core_driver_list_lock);
  72
  73 static const char mlxsw_core_driver_name[] = "mlxsw_core";
  74
  75 static struct dentry *mlxsw_core_dbg_root;
  76
  77 static struct workqueue_struct *mlxsw_wq;
  78
  79 struct mlxsw_core_pcpu_stats {
  80         u64                     trap_rx_packets[MLXSW_TRAP_ID_MAX];
  81         u64                     trap_rx_bytes[MLXSW_TRAP_ID_MAX];
  82         u64                     port_rx_packets[MLXSW_PORT_MAX_PORTS];
  83         u64                     port_rx_bytes[MLXSW_PORT_MAX_PORTS];
  84         struct u64_stats_sync   syncp;
  85         u32                     trap_rx_dropped[MLXSW_TRAP_ID_MAX];
  86         u32                     port_rx_dropped[MLXSW_PORT_MAX_PORTS];
  87         u32                     trap_rx_invalid;
  88         u32                     port_rx_invalid;
  89 };
  90
  91 struct mlxsw_core {
  92         struct mlxsw_driver *driver;
  93         const struct mlxsw_bus *bus;
  94         void *bus_priv;
  95         const struct mlxsw_bus_info *bus_info;
  96         struct list_head rx_listener_list;
  97         struct list_head event_listener_list;
  98         struct {
  99                 struct sk_buff *resp_skb;
 100                 u64 tid;
 101                 wait_queue_head_t wait;
 102                 bool trans_active;
 103                 struct mutex lock; /* One EMAD transaction at a time. */
 104                 bool use_emad;
 105         } emad;
 106         struct mlxsw_core_pcpu_stats __percpu *pcpu_stats;
 107         struct dentry *dbg_dir;
 108         struct {
 109                 struct debugfs_blob_wrapper vsd_blob;
 110                 struct debugfs_blob_wrapper psid_blob;
 111         } dbg;
 112         struct {
 113                 u8 *mapping; /* lag_id+port_index to local_port mapping */
 114         } lag;
 115         struct mlxsw_hwmon *hwmon;
 116         unsigned long driver_priv[0];
 117         /* driver_priv has to be always the last item */
 118 };
 119
 120 void *mlxsw_core_driver_priv(struct mlxsw_core *mlxsw_core)
 121 {
 122         return mlxsw_core->driver_priv;
 123 }
 124 EXPORT_SYMBOL(mlxsw_core_driver_priv);
 125
 126 struct mlxsw_rx_listener_item {
 127         struct list_head list;
 128         struct mlxsw_rx_listener rxl;
 129         void *priv;
 130 };
 131
 132 struct mlxsw_event_listener_item {
 133         struct list_head list;
 134         struct mlxsw_event_listener el;
 135         void *priv;
 136 };
 137
 138 /******************
 139  * EMAD processing
 140  ******************/
 141
 142 /* emad_eth_hdr_dmac
 143  * Destination MAC in EMAD's Ethernet header.
 144  * Must be set to 01:02:c9:00:00:01
 145  */
 146 MLXSW_ITEM_BUF(emad, eth_hdr, dmac, 0x00, 6);
 147
 148 /* emad_eth_hdr_smac
 149  * Source MAC in EMAD's Ethernet header.
 150  * Must be set to 00:02:c9:01:02:03
 151  */
 152 MLXSW_ITEM_BUF(emad, eth_hdr, smac, 0x06, 6);
 153
 154 /* emad_eth_hdr_ethertype
 155  * Ethertype in EMAD's Ethernet header.
 156  * Must be set to 0x8932
 157  */
 158 MLXSW_ITEM32(emad, eth_hdr, ethertype, 0x0C, 16, 16);
 159
 160 /* emad_eth_hdr_mlx_proto
 161  * Mellanox protocol.
 162  * Must be set to 0x0.
 163  */
 164 MLXSW_ITEM32(emad, eth_hdr, mlx_proto, 0x0C, 8, 8);
 165
 166 /* emad_eth_hdr_ver
 167  * Mellanox protocol version.
 168  * Must be set to 0x0.
 169  */
 170 MLXSW_ITEM32(emad, eth_hdr, ver, 0x0C, 4, 4);
 171
 172 /* emad_op_tlv_type
 173  * Type of the TLV.
 174  * Must be set to 0x1 (operation TLV).
 175  */
 176 MLXSW_ITEM32(emad, op_tlv, type, 0x00, 27, 5);
 177
 178 /* emad_op_tlv_len
 179  * Length of the operation TLV in u32.
 180  * Must be set to 0x4.
 181  */
 182 MLXSW_ITEM32(emad, op_tlv, len, 0x00, 16, 11);
 183
 184 /* emad_op_tlv_dr
 185  * Direct route bit. Setting to 1 indicates the EMAD is a direct route
 186  * EMAD. DR TLV must follow.
 187  *
 188  * Note: Currently not supported and must not be set.
 189  */
 190 MLXSW_ITEM32(emad, op_tlv, dr, 0x00, 15, 1);
 191
 192 /* emad_op_tlv_status
 193  * Returned status in case of EMAD response. Must be set to 0 in case
 194  * of EMAD request.
 195  * 0x0 - success
 196  * 0x1 - device is busy. Requester should retry
 197  * 0x2 - Mellanox protocol version not supported
 198  * 0x3 - unknown TLV
 199  * 0x4 - register not supported
 200  * 0x5 - operation class not supported
 201  * 0x6 - EMAD method not supported
 202  * 0x7 - bad parameter (e.g. port out of range)
 203  * 0x8 - resource not available
 204  * 0x9 - message receipt acknowledgment. Requester should retry
 205  * 0x70 - internal error
 206  */
 207 MLXSW_ITEM32(emad, op_tlv, status, 0x00, 8, 7);
 208
 209 /* emad_op_tlv_register_id
 210  * Register ID of register within register TLV.
 211  */
 212 MLXSW_ITEM32(emad, op_tlv, register_id, 0x04, 16, 16);
 213
 214 /* emad_op_tlv_r
 215  * Response bit. Setting to 1 indicates Response, otherwise request.
 216  */
 217 MLXSW_ITEM32(emad, op_tlv, r, 0x04, 15, 1);
 218
 219 /* emad_op_tlv_method
 220  * EMAD method type.
 221  * 0x1 - query
 222  * 0x2 - write
 223  * 0x3 - send (currently not supported)
 224  * 0x4 - event
 225  */
 226 MLXSW_ITEM32(emad, op_tlv, method, 0x04, 8, 7);
 227
 228 /* emad_op_tlv_class
 229  * EMAD operation class. Must be set to 0x1 (REG_ACCESS).
 230  */
 231 MLXSW_ITEM32(emad, op_tlv, class, 0x04, 0, 8);
 232
 233 /* emad_op_tlv_tid
 234  * EMAD transaction ID. Used for pairing request and response EMADs.
 235  */
 236 MLXSW_ITEM64(emad, op_tlv, tid, 0x08, 0, 64);
 237
 238 /* emad_reg_tlv_type
 239  * Type of the TLV.
 240  * Must be set to 0x3 (register TLV).
 241  */
 242 MLXSW_ITEM32(emad, reg_tlv, type, 0x00, 27, 5);
 243
 244 /* emad_reg_tlv_len
 245  * Length of the operation TLV in u32.
 246  */
 247 MLXSW_ITEM32(emad, reg_tlv, len, 0x00, 16, 11);
 248
 249 /* emad_end_tlv_type
 250  * Type of the TLV.
 251  * Must be set to 0x0 (end TLV).
 252  */
 253 MLXSW_ITEM32(emad, end_tlv, type, 0x00, 27, 5);
 254
 255 /* emad_end_tlv_len
 256  * Length of the end TLV in u32.
 257  * Must be set to 1.
 258  */
 259 MLXSW_ITEM32(emad, end_tlv, len, 0x00, 16, 11);
 260
 261 enum mlxsw_core_reg_access_type {
 262         MLXSW_CORE_REG_ACCESS_TYPE_QUERY,
 263         MLXSW_CORE_REG_ACCESS_TYPE_WRITE,
 264 };
 265
 266 static inline const char *
 267 mlxsw_core_reg_access_type_str(enum mlxsw_core_reg_access_type type)
 268 {
 269         switch (type) {
 270         case MLXSW_CORE_REG_ACCESS_TYPE_QUERY:
 271                 return "query";
 272         case MLXSW_CORE_REG_ACCESS_TYPE_WRITE:
 273                 return "write";
 274         }
 275         BUG();
 276 }
 277
 278 static void mlxsw_emad_pack_end_tlv(char *end_tlv)
 279 {
 280         mlxsw_emad_end_tlv_type_set(end_tlv, MLXSW_EMAD_TLV_TYPE_END);
 281         mlxsw_emad_end_tlv_len_set(end_tlv, MLXSW_EMAD_END_TLV_LEN);
 282 }
 283
 284 static void mlxsw_emad_pack_reg_tlv(char *reg_tlv,
 285                                     const struct mlxsw_reg_info *reg,
 286                                     char *payload)
 287 {
 288         mlxsw_emad_reg_tlv_type_set(reg_tlv, MLXSW_EMAD_TLV_TYPE_REG);
 289         mlxsw_emad_reg_tlv_len_set(reg_tlv, reg->len / sizeof(u32) + 1);
 290         memcpy(reg_tlv + sizeof(u32), payload, reg->len);
 291 }
 292
 293 static void mlxsw_emad_pack_op_tlv(char *op_tlv,
 294                                    const struct mlxsw_reg_info *reg,
 295                                    enum mlxsw_core_reg_access_type type,
 296                                    struct mlxsw_core *mlxsw_core)
 297 {
 298         mlxsw_emad_op_tlv_type_set(op_tlv, MLXSW_EMAD_TLV_TYPE_OP);
 299         mlxsw_emad_op_tlv_len_set(op_tlv, MLXSW_EMAD_OP_TLV_LEN);
 300         mlxsw_emad_op_tlv_dr_set(op_tlv, 0);
 301         mlxsw_emad_op_tlv_status_set(op_tlv, 0);
 302         mlxsw_emad_op_tlv_register_id_set(op_tlv, reg->id);
 303         mlxsw_emad_op_tlv_r_set(op_tlv, MLXSW_EMAD_OP_TLV_REQUEST);
 304         if (type == MLXSW_CORE_REG_ACCESS_TYPE_QUERY)
 305                 mlxsw_emad_op_tlv_method_set(op_tlv,
 306                                              MLXSW_EMAD_OP_TLV_METHOD_QUERY);
 307         else
 308                 mlxsw_emad_op_tlv_method_set(op_tlv,
 309                                              MLXSW_EMAD_OP_TLV_METHOD_WRITE);
 310         mlxsw_emad_op_tlv_class_set(op_tlv,
 311                                     MLXSW_EMAD_OP_TLV_CLASS_REG_ACCESS);
 312         mlxsw_emad_op_tlv_tid_set(op_tlv, mlxsw_core->emad.tid);
 313 }
 314
 315 static int mlxsw_emad_construct_eth_hdr(struct sk_buff *skb)
 316 {
 317         char *eth_hdr = skb_push(skb, MLXSW_EMAD_ETH_HDR_LEN);
 318
 319         mlxsw_emad_eth_hdr_dmac_memcpy_to(eth_hdr, MLXSW_EMAD_EH_DMAC);
 320         mlxsw_emad_eth_hdr_smac_memcpy_to(eth_hdr, MLXSW_EMAD_EH_SMAC);
 321         mlxsw_emad_eth_hdr_ethertype_set(eth_hdr, MLXSW_EMAD_EH_ETHERTYPE);
 322         mlxsw_emad_eth_hdr_mlx_proto_set(eth_hdr, MLXSW_EMAD_EH_MLX_PROTO);
 323         mlxsw_emad_eth_hdr_ver_set(eth_hdr, MLXSW_EMAD_EH_PROTO_VERSION);
 324
 325         skb_reset_mac_header(skb);
 326
 327         return 0;
 328 }
 329
 330 static void mlxsw_emad_construct(struct sk_buff *skb,
 331                                  const struct mlxsw_reg_info *reg,
 332                                  char *payload,
 333                                  enum mlxsw_core_reg_access_type type,
 334                                  struct mlxsw_core *mlxsw_core)
 335 {
 336         char *buf;
 337
 338         buf = skb_push(skb, MLXSW_EMAD_END_TLV_LEN * sizeof(u32));
 339         mlxsw_emad_pack_end_tlv(buf);
 340
 341         buf = skb_push(skb, reg->len + sizeof(u32));
 342         mlxsw_emad_pack_reg_tlv(buf, reg, payload);
 343
 344         buf = skb_push(skb, MLXSW_EMAD_OP_TLV_LEN * sizeof(u32));
 345         mlxsw_emad_pack_op_tlv(buf, reg, type, mlxsw_core);
 346
 347         mlxsw_emad_construct_eth_hdr(skb);
 348 }
 349
 350 static char *mlxsw_emad_op_tlv(const struct sk_buff *skb)
 351 {
 352         return ((char *) (skb->data + MLXSW_EMAD_ETH_HDR_LEN));
 353 }
 354
 355 static char *mlxsw_emad_reg_tlv(const struct sk_buff *skb)
 356 {
 357         return ((char *) (skb->data + MLXSW_EMAD_ETH_HDR_LEN +
 358                                       MLXSW_EMAD_OP_TLV_LEN * sizeof(u32)));
 359 }
 360
 361 static char *mlxsw_emad_reg_payload(const char *op_tlv)
 362 {
 363         return ((char *) (op_tlv + (MLXSW_EMAD_OP_TLV_LEN + 1) * sizeof(u32)));
 364 }
 365
 366 static u64 mlxsw_emad_get_tid(const struct sk_buff *skb)
 367 {
 368         char *op_tlv;
 369
 370         op_tlv = mlxsw_emad_op_tlv(skb);
 371         return mlxsw_emad_op_tlv_tid_get(op_tlv);
 372 }
 373
 374 static bool mlxsw_emad_is_resp(const struct sk_buff *skb)
 375 {
 376         char *op_tlv;
 377
 378         op_tlv = mlxsw_emad_op_tlv(skb);
 379         return (mlxsw_emad_op_tlv_r_get(op_tlv) == MLXSW_EMAD_OP_TLV_RESPONSE);
 380 }
 381
 382 #define MLXSW_EMAD_TIMEOUT_MS 200
 383
 384 static int __mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core,
 385                                  struct sk_buff *skb,
 386                                  const struct mlxsw_tx_info *tx_info)
 387 {
 388         int err;
 389         int ret;
 390
 391         mlxsw_core->emad.trans_active = true;
 392
 393         err = mlxsw_core_skb_transmit(mlxsw_core, skb, tx_info);
 394         if (err) {
 395                 dev_err(mlxsw_core->bus_info->dev, "Failed to transmit EMAD (tid=%llx)\n",
 396                         mlxsw_core->emad.tid);
 397                 dev_kfree_skb(skb);
 398                 goto trans_inactive_out;
 399         }
 400
 401         ret = wait_event_timeout(mlxsw_core->emad.wait,
 402                                  !(mlxsw_core->emad.trans_active),
 403                                  msecs_to_jiffies(MLXSW_EMAD_TIMEOUT_MS));
 404         if (!ret) {
 405                 dev_warn(mlxsw_core->bus_info->dev, "EMAD timed-out (tid=%llx)\n",
 406                          mlxsw_core->emad.tid);
 407                 err = -EIO;
 408                 goto trans_inactive_out;
 409         }
 410
 411         return 0;
 412
 413 trans_inactive_out:
 414         mlxsw_core->emad.trans_active = false;
 415         return err;
 416 }
 417
 418 static int mlxsw_emad_process_status(struct mlxsw_core *mlxsw_core,
 419                                      char *op_tlv)
 420 {
 421         enum mlxsw_emad_op_tlv_status status;
 422         u64 tid;
 423
 424         status = mlxsw_emad_op_tlv_status_get(op_tlv);
 425         tid = mlxsw_emad_op_tlv_tid_get(op_tlv);
 426
 427         switch (status) {
 428         case MLXSW_EMAD_OP_TLV_STATUS_SUCCESS:
 429                 return 0;
 430         case MLXSW_EMAD_OP_TLV_STATUS_BUSY:
 431         case MLXSW_EMAD_OP_TLV_STATUS_MESSAGE_RECEIPT_ACK:
 432                 dev_warn(mlxsw_core->bus_info->dev, "Reg access status again (tid=%llx,status=%x(%s))\n",
 433                          tid, status, mlxsw_emad_op_tlv_status_str(status));
 434                 return -EAGAIN;
 435         case MLXSW_EMAD_OP_TLV_STATUS_VERSION_NOT_SUPPORTED:
 436         case MLXSW_EMAD_OP_TLV_STATUS_UNKNOWN_TLV:
 437         case MLXSW_EMAD_OP_TLV_STATUS_REGISTER_NOT_SUPPORTED:
 438         case MLXSW_EMAD_OP_TLV_STATUS_CLASS_NOT_SUPPORTED:
 439         case MLXSW_EMAD_OP_TLV_STATUS_METHOD_NOT_SUPPORTED:
 440         case MLXSW_EMAD_OP_TLV_STATUS_BAD_PARAMETER:
 441         case MLXSW_EMAD_OP_TLV_STATUS_RESOURCE_NOT_AVAILABLE:
 442         case MLXSW_EMAD_OP_TLV_STATUS_INTERNAL_ERROR:
 443         default:
 444                 dev_err(mlxsw_core->bus_info->dev, "Reg access status failed (tid=%llx,status=%x(%s))\n",
 445                         tid, status, mlxsw_emad_op_tlv_status_str(status));
 446                 return -EIO;
 447         }
 448 }
 449
 450 static int mlxsw_emad_process_status_skb(struct mlxsw_core *mlxsw_core,
 451                                          struct sk_buff *skb)
 452 {
 453         return mlxsw_emad_process_status(mlxsw_core, mlxsw_emad_op_tlv(skb));
 454 }
 455
 456 static int mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core,
 457                                struct sk_buff *skb,
 458                                const struct mlxsw_tx_info *tx_info)
 459 {
 460         struct sk_buff *trans_skb;
 461         int n_retry;
 462         int err;
 463
 464         n_retry = 0;
 465 retry:
 466         /* We copy the EMAD to a new skb, since we might need
 467          * to retransmit it in case of failure.
 468          */
 469         trans_skb = skb_copy(skb, GFP_KERNEL);
 470         if (!trans_skb) {
 471                 err = -ENOMEM;
 472                 goto out;
 473         }
 474
 475         err = __mlxsw_emad_transmit(mlxsw_core, trans_skb, tx_info);
 476         if (!err) {
 477                 struct sk_buff *resp_skb = mlxsw_core->emad.resp_skb;
 478
 479                 err = mlxsw_emad_process_status_skb(mlxsw_core, resp_skb);
 480                 if (err)
 481                         dev_kfree_skb(resp_skb);
 482                 if (!err || err != -EAGAIN)
 483                         goto out;
 484         }
 485         if (n_retry++ < MLXSW_EMAD_MAX_RETRY)
 486                 goto retry;
 487
 488 out:
 489         dev_kfree_skb(skb);
 490         mlxsw_core->emad.tid++;
 491         return err;
 492 }
 493
 494 static void mlxsw_emad_rx_listener_func(struct sk_buff *skb, u8 local_port,
 495                                         void *priv)
 496 {
 497         struct mlxsw_core *mlxsw_core = priv;
 498
 499         if (mlxsw_emad_is_resp(skb) &&
 500             mlxsw_core->emad.trans_active &&
 501             mlxsw_emad_get_tid(skb) == mlxsw_core->emad.tid) {
 502                 mlxsw_core->emad.resp_skb = skb;
 503                 mlxsw_core->emad.trans_active = false;
 504                 wake_up(&mlxsw_core->emad.wait);
 505         } else {
 506                 dev_kfree_skb(skb);
 507         }
 508 }
 509
 510 static const struct mlxsw_rx_listener mlxsw_emad_rx_listener = {
 511         .func = mlxsw_emad_rx_listener_func,
 512         .local_port = MLXSW_PORT_DONT_CARE,
 513         .trap_id = MLXSW_TRAP_ID_ETHEMAD,
 514 };
 515
 516 static int mlxsw_emad_traps_set(struct mlxsw_core *mlxsw_core)
 517 {
 518         char htgt_pl[MLXSW_REG_HTGT_LEN];
 519         char hpkt_pl[MLXSW_REG_HPKT_LEN];
 520         int err;
 521
 522         mlxsw_reg_htgt_pack(htgt_pl, MLXSW_REG_HTGT_TRAP_GROUP_EMAD);
 523         err = mlxsw_reg_write(mlxsw_core, MLXSW_REG(htgt), htgt_pl);
 524         if (err)
 525                 return err;
 526
 527         mlxsw_reg_hpkt_pack(hpkt_pl, MLXSW_REG_HPKT_ACTION_TRAP_TO_CPU,
 528                             MLXSW_TRAP_ID_ETHEMAD);
 529         return mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl);
 530 }
 531
 532 static int mlxsw_emad_init(struct mlxsw_core *mlxsw_core)
 533 {
 534         int err;
 535
 536         /* Set the upper 32 bits of the transaction ID field to a random
 537          * number. This allows us to discard EMADs addressed to other
 538          * devices.
 539          */
 540         get_random_bytes(&mlxsw_core->emad.tid, 4);
 541         mlxsw_core->emad.tid = mlxsw_core->emad.tid << 32;
 542
 543         init_waitqueue_head(&mlxsw_core->emad.wait);
 544         mlxsw_core->emad.trans_active = false;
 545         mutex_init(&mlxsw_core->emad.lock);
 546
 547         err = mlxsw_core_rx_listener_register(mlxsw_core,
 548                                               &mlxsw_emad_rx_listener,
 549                                               mlxsw_core);
 550         if (err)
 551                 return err;
 552
 553         err = mlxsw_emad_traps_set(mlxsw_core);
 554         if (err)
 555                 goto err_emad_trap_set;
 556
 557         mlxsw_core->emad.use_emad = true;
 558
 559         return 0;
 560
 561 err_emad_trap_set:
 562         mlxsw_core_rx_listener_unregister(mlxsw_core,
 563                                           &mlxsw_emad_rx_listener,
 564                                           mlxsw_core);
 565         return err;
 566 }
 567
 568 static void mlxsw_emad_fini(struct mlxsw_core *mlxsw_core)
 569 {
 570         char hpkt_pl[MLXSW_REG_HPKT_LEN];
 571
 572         mlxsw_core->emad.use_emad = false;
 573         mlxsw_reg_hpkt_pack(hpkt_pl, MLXSW_REG_HPKT_ACTION_DISCARD,
 574                             MLXSW_TRAP_ID_ETHEMAD);
 575         mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl);
 576
 577         mlxsw_core_rx_listener_unregister(mlxsw_core,
 578                                           &mlxsw_emad_rx_listener,
 579                                           mlxsw_core);
 580 }
 581
 582 static struct sk_buff *mlxsw_emad_alloc(const struct mlxsw_core *mlxsw_core,
 583                                         u16 reg_len)
 584 {
 585         struct sk_buff *skb;
 586         u16 emad_len;
 587
 588         emad_len = (reg_len + sizeof(u32) + MLXSW_EMAD_ETH_HDR_LEN +
 589                     (MLXSW_EMAD_OP_TLV_LEN + MLXSW_EMAD_END_TLV_LEN) *
 590                     sizeof(u32) + mlxsw_core->driver->txhdr_len);
 591         if (emad_len > MLXSW_EMAD_MAX_FRAME_LEN)
 592                 return NULL;
 593
 594         skb = netdev_alloc_skb(NULL, emad_len);
 595         if (!skb)
 596                 return NULL;
 597         memset(skb->data, 0, emad_len);
 598         skb_reserve(skb, emad_len);
 599
 600         return skb;
 601 }
 602
 603 /*****************
 604  * Core functions
 605  *****************/
 606
 607 static int mlxsw_core_rx_stats_dbg_read(struct seq_file *file, void *data)
 608 {
 609         struct mlxsw_core *mlxsw_core = file->private;
 610         struct mlxsw_core_pcpu_stats *p;
 611         u64 rx_packets, rx_bytes;
 612         u64 tmp_rx_packets, tmp_rx_bytes;
 613         u32 rx_dropped, rx_invalid;
 614         unsigned int start;
 615         int i;
 616         int j;
 617         static const char hdr[] =
 618                 "     NUM   RX_PACKETS     RX_BYTES RX_DROPPED\n";
 619
 620         seq_printf(file, hdr);
 621         for (i = 0; i < MLXSW_TRAP_ID_MAX; i++) {
 622                 rx_packets = 0;
 623                 rx_bytes = 0;
 624                 rx_dropped = 0;
 625                 for_each_possible_cpu(j) {
 626                         p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
 627                         do {
 628                                 start = u64_stats_fetch_begin(&p->syncp);
 629                                 tmp_rx_packets = p->trap_rx_packets[i];
 630                                 tmp_rx_bytes = p->trap_rx_bytes[i];
 631                         } while (u64_stats_fetch_retry(&p->syncp, start));
 632
 633                         rx_packets += tmp_rx_packets;
 634                         rx_bytes += tmp_rx_bytes;
 635                         rx_dropped += p->trap_rx_dropped[i];
 636                 }
 637                 seq_printf(file, "trap %3d %12llu %12llu %10u\n",
 638                            i, rx_packets, rx_bytes, rx_dropped);
 639         }
 640         rx_invalid = 0;
 641         for_each_possible_cpu(j) {
 642                 p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
 643                 rx_invalid += p->trap_rx_invalid;
 644         }
 645         seq_printf(file, "trap INV                           %10u\n",
 646                    rx_invalid);
 647
 648         for (i = 0; i < MLXSW_PORT_MAX_PORTS; i++) {
 649                 rx_packets = 0;
 650                 rx_bytes = 0;
 651                 rx_dropped = 0;
 652                 for_each_possible_cpu(j) {
 653                         p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
 654                         do {
 655                                 start = u64_stats_fetch_begin(&p->syncp);
 656                                 tmp_rx_packets = p->port_rx_packets[i];
 657                                 tmp_rx_bytes = p->port_rx_bytes[i];
 658                         } while (u64_stats_fetch_retry(&p->syncp, start));
 659
 660                         rx_packets += tmp_rx_packets;
 661                         rx_bytes += tmp_rx_bytes;
 662                         rx_dropped += p->port_rx_dropped[i];
 663                 }
 664                 seq_printf(file, "port %3d %12llu %12llu %10u\n",
 665                            i, rx_packets, rx_bytes, rx_dropped);
 666         }
 667         rx_invalid = 0;
 668         for_each_possible_cpu(j) {
 669                 p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
 670                 rx_invalid += p->port_rx_invalid;
 671         }
 672         seq_printf(file, "port INV                           %10u\n",
 673                    rx_invalid);
 674         return 0;
 675 }
 676
 677 static int mlxsw_core_rx_stats_dbg_open(struct inode *inode, struct file *f)
 678 {
 679         struct mlxsw_core *mlxsw_core = inode->i_private;
 680
 681         return single_open(f, mlxsw_core_rx_stats_dbg_read, mlxsw_core);
 682 }
 683
 684 static const struct file_operations mlxsw_core_rx_stats_dbg_ops = {
 685         .owner = THIS_MODULE,
 686         .open = mlxsw_core_rx_stats_dbg_open,
 687         .release = single_release,
 688         .read = seq_read,
 689         .llseek = seq_lseek
 690 };
 691
 692 static void mlxsw_core_buf_dump_dbg(struct mlxsw_core *mlxsw_core,
 693                                     const char *buf, size_t size)
 694 {
 695         __be32 *m = (__be32 *) buf;
 696         int i;
 697         int count = size / sizeof(__be32);
 698
 699         for (i = count - 1; i >= 0; i--)
 700                 if (m[i])
 701                         break;
 702         i++;
 703         count = i ? i : 1;
 704         for (i = 0; i < count; i += 4)
 705                 dev_dbg(mlxsw_core->bus_info->dev, "%04x - %08x %08x %08x %08x\n",
 706                         i * 4, be32_to_cpu(m[i]), be32_to_cpu(m[i + 1]),
 707                         be32_to_cpu(m[i + 2]), be32_to_cpu(m[i + 3]));
 708 }
 709
 710 int mlxsw_core_driver_register(struct mlxsw_driver *mlxsw_driver)
 711 {
 712         spin_lock(&mlxsw_core_driver_list_lock);
 713         list_add_tail(&mlxsw_driver->list, &mlxsw_core_driver_list);
 714         spin_unlock(&mlxsw_core_driver_list_lock);
 715         return 0;
 716 }
 717 EXPORT_SYMBOL(mlxsw_core_driver_register);
 718
 719 void mlxsw_core_driver_unregister(struct mlxsw_driver *mlxsw_driver)
 720 {
 721         spin_lock(&mlxsw_core_driver_list_lock);
 722         list_del(&mlxsw_driver->list);
 723         spin_unlock(&mlxsw_core_driver_list_lock);
 724 }
 725 EXPORT_SYMBOL(mlxsw_core_driver_unregister);
 726
 727 static struct mlxsw_driver *__driver_find(const char *kind)
 728 {
 729         struct mlxsw_driver *mlxsw_driver;
 730
 731         list_for_each_entry(mlxsw_driver, &mlxsw_core_driver_list, list) {
 732                 if (strcmp(mlxsw_driver->kind, kind) == 0)
 733                         return mlxsw_driver;
 734         }
 735         return NULL;
 736 }
 737
 738 static struct mlxsw_driver *mlxsw_core_driver_get(const char *kind)
 739 {
 740         struct mlxsw_driver *mlxsw_driver;
 741
 742         spin_lock(&mlxsw_core_driver_list_lock);
 743         mlxsw_driver = __driver_find(kind);
 744         if (!mlxsw_driver) {
 745                 spin_unlock(&mlxsw_core_driver_list_lock);
 746                 request_module(MLXSW_MODULE_ALIAS_PREFIX "%s", kind);
 747                 spin_lock(&mlxsw_core_driver_list_lock);
 748                 mlxsw_driver = __driver_find(kind);
 749         }
 750         if (mlxsw_driver) {
 751                 if (!try_module_get(mlxsw_driver->owner))
 752                         mlxsw_driver = NULL;
 753         }
 754
 755         spin_unlock(&mlxsw_core_driver_list_lock);
 756         return mlxsw_driver;
 757 }
 758
 759 static void mlxsw_core_driver_put(const char *kind)
 760 {
 761         struct mlxsw_driver *mlxsw_driver;
 762
 763         spin_lock(&mlxsw_core_driver_list_lock);
 764         mlxsw_driver = __driver_find(kind);
 765         spin_unlock(&mlxsw_core_driver_list_lock);
 766         if (!mlxsw_driver)
 767                 return;
 768         module_put(mlxsw_driver->owner);
 769 }
 770
 771 static int mlxsw_core_debugfs_init(struct mlxsw_core *mlxsw_core)
 772 {
 773         const struct mlxsw_bus_info *bus_info = mlxsw_core->bus_info;
 774
 775         mlxsw_core->dbg_dir = debugfs_create_dir(bus_info->device_name,
 776                                                  mlxsw_core_dbg_root);
 777         if (!mlxsw_core->dbg_dir)
 778                 return -ENOMEM;
 779         debugfs_create_file("rx_stats", S_IRUGO, mlxsw_core->dbg_dir,
 780                             mlxsw_core, &mlxsw_core_rx_stats_dbg_ops);
 781         mlxsw_core->dbg.vsd_blob.data = (void *) &bus_info->vsd;
 782         mlxsw_core->dbg.vsd_blob.size = sizeof(bus_info->vsd);
 783         debugfs_create_blob("vsd", S_IRUGO, mlxsw_core->dbg_dir,
 784                             &mlxsw_core->dbg.vsd_blob);
 785         mlxsw_core->dbg.psid_blob.data = (void *) &bus_info->psid;
 786         mlxsw_core->dbg.psid_blob.size = sizeof(bus_info->psid);
 787         debugfs_create_blob("psid", S_IRUGO, mlxsw_core->dbg_dir,
 788                             &mlxsw_core->dbg.psid_blob);
 789         return 0;
 790 }
 791
 792 static void mlxsw_core_debugfs_fini(struct mlxsw_core *mlxsw_core)
 793 {
 794         debugfs_remove_recursive(mlxsw_core->dbg_dir);
 795 }
 796
 797 static int mlxsw_devlink_port_split(struct devlink *devlink,
 798                                     unsigned int port_index,
 799                                     unsigned int count)
 800 {
 801         struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
 802
 803         if (port_index >= MLXSW_PORT_MAX_PORTS)
 804                 return -EINVAL;
 805         if (!mlxsw_core->driver->port_split)
 806                 return -EOPNOTSUPP;
 807         return mlxsw_core->driver->port_split(mlxsw_core, port_index, count);
 808 }
 809
 810 static int mlxsw_devlink_port_unsplit(struct devlink *devlink,
 811                                       unsigned int port_index)
 812 {
 813         struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
 814
 815         if (port_index >= MLXSW_PORT_MAX_PORTS)
 816                 return -EINVAL;
 817         if (!mlxsw_core->driver->port_unsplit)
 818                 return -EOPNOTSUPP;
 819         return mlxsw_core->driver->port_unsplit(mlxsw_core, port_index);
 820 }
 821
 822 static int
 823 mlxsw_devlink_sb_pool_get(struct devlink *devlink,
 824                           unsigned int sb_index, u16 pool_index,
 825                           struct devlink_sb_pool_info *pool_info)
 826 {
 827         struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
 828         struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
 829
 830         if (!mlxsw_driver->sb_pool_get)
 831                 return -EOPNOTSUPP;
 832         return mlxsw_driver->sb_pool_get(mlxsw_core, sb_index,
 833                                          pool_index, pool_info);
 834 }
 835
 836 static int
 837 mlxsw_devlink_sb_pool_set(struct devlink *devlink,
 838                           unsigned int sb_index, u16 pool_index, u32 size,
 839                           enum devlink_sb_threshold_type threshold_type)
 840 {
 841         struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
 842         struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
 843
 844         if (!mlxsw_driver->sb_pool_set)
 845                 return -EOPNOTSUPP;
 846         return mlxsw_driver->sb_pool_set(mlxsw_core, sb_index,
 847                                          pool_index, size, threshold_type);
 848 }
 849
 850 static void *__dl_port(struct devlink_port *devlink_port)
 851 {
 852         return container_of(devlink_port, struct mlxsw_core_port, devlink_port);
 853 }
 854
 855 static int mlxsw_devlink_sb_port_pool_get(struct devlink_port *devlink_port,
 856                                           unsigned int sb_index, u16 pool_index,
 857                                           u32 *p_threshold)
 858 {
 859         struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
 860         struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
 861         struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);
 862
 863         if (!mlxsw_driver->sb_port_pool_get)
 864                 return -EOPNOTSUPP;
 865         return mlxsw_driver->sb_port_pool_get(mlxsw_core_port, sb_index,
 866                                               pool_index, p_threshold);
 867 }
 868
 869 static int mlxsw_devlink_sb_port_pool_set(struct devlink_port *devlink_port,
 870                                           unsigned int sb_index, u16 pool_index,
 871                                           u32 threshold)
 872 {
 873         struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
 874         struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
 875         struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);
 876
 877         if (!mlxsw_driver->sb_port_pool_set)
 878                 return -EOPNOTSUPP;
 879         return mlxsw_driver->sb_port_pool_set(mlxsw_core_port, sb_index,
 880                                               pool_index, threshold);
 881 }
 882
 883 static int
 884 mlxsw_devlink_sb_tc_pool_bind_get(struct devlink_port *devlink_port,
 885                                   unsigned int sb_index, u16 tc_index,
 886                                   enum devlink_sb_pool_type pool_type,
 887                                   u16 *p_pool_index, u32 *p_threshold)
 888 {
 889         struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
 890         struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
 891         struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);
 892
 893         if (!mlxsw_driver->sb_tc_pool_bind_get)
 894                 return -EOPNOTSUPP;
 895         return mlxsw_driver->sb_tc_pool_bind_get(mlxsw_core_port, sb_index,
 896                                                  tc_index, pool_type,
 897                                                  p_pool_index, p_threshold);
 898 }
 899
 900 static int
 901 mlxsw_devlink_sb_tc_pool_bind_set(struct devlink_port *devlink_port,
 902                                   unsigned int sb_index, u16 tc_index,
 903                                   enum devlink_sb_pool_type pool_type,
 904                                   u16 pool_index, u32 threshold)
 905 {
 906         struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
 907         struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
 908         struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);
 909
 910         if (!mlxsw_driver->sb_tc_pool_bind_set)
 911                 return -EOPNOTSUPP;
 912         return mlxsw_driver->sb_tc_pool_bind_set(mlxsw_core_port, sb_index,
 913                                                  tc_index, pool_type,
 914                                                  pool_index, threshold);
 915 }
 916
 917 static int mlxsw_devlink_sb_occ_snapshot(struct devlink *devlink,
 918                                          unsigned int sb_index)
 919 {
 920         struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
 921         struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
 922
 923         if (!mlxsw_driver->sb_occ_snapshot)
 924                 return -EOPNOTSUPP;
 925         return mlxsw_driver->sb_occ_snapshot(mlxsw_core, sb_index);
 926 }
 927
 928 static int mlxsw_devlink_sb_occ_max_clear(struct devlink *devlink,
 929                                           unsigned int sb_index)
 930 {
 931         struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
 932         struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
 933
 934         if (!mlxsw_driver->sb_occ_max_clear)
 935                 return -EOPNOTSUPP;
 936         return mlxsw_driver->sb_occ_max_clear(mlxsw_core, sb_index);
 937 }
 938
 939 static int
 940 mlxsw_devlink_sb_occ_port_pool_get(struct devlink_port *devlink_port,
 941                                    unsigned int sb_index, u16 pool_index,
 942                                    u32 *p_cur, u32 *p_max)
 943 {
 944         struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
 945         struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
 946         struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);
 947
 948         if (!mlxsw_driver->sb_occ_port_pool_get)
 949                 return -EOPNOTSUPP;
 950         return mlxsw_driver->sb_occ_port_pool_get(mlxsw_core_port, sb_index,
 951                                                   pool_index, p_cur, p_max);
 952 }
 953
 954 static int
 955 mlxsw_devlink_sb_occ_tc_port_bind_get(struct devlink_port *devlink_port,
 956                                       unsigned int sb_index, u16 tc_index,
 957                                       enum devlink_sb_pool_type pool_type,
 958                                       u32 *p_cur, u32 *p_max)
 959 {
 960         struct mlxsw_core *mlxsw_core = devlink_priv(devlink_port->devlink);
 961         struct mlxsw_driver *mlxsw_driver = mlxsw_core->driver;
 962         struct mlxsw_core_port *mlxsw_core_port = __dl_port(devlink_port);
 963
 964         if (!mlxsw_driver->sb_occ_tc_port_bind_get)
 965                 return -EOPNOTSUPP;
 966         return mlxsw_driver->sb_occ_tc_port_bind_get(mlxsw_core_port,
 967                                                      sb_index, tc_index,
 968                                                      pool_type, p_cur, p_max);
 969 }
 970
 971 static const struct devlink_ops mlxsw_devlink_ops = {
 972         .port_split                     = mlxsw_devlink_port_split,
 973         .port_unsplit                   = mlxsw_devlink_port_unsplit,
 974         .sb_pool_get                    = mlxsw_devlink_sb_pool_get,
 975         .sb_pool_set                    = mlxsw_devlink_sb_pool_set,
 976         .sb_port_pool_get               = mlxsw_devlink_sb_port_pool_get,
 977         .sb_port_pool_set               = mlxsw_devlink_sb_port_pool_set,
 978         .sb_tc_pool_bind_get            = mlxsw_devlink_sb_tc_pool_bind_get,
 979         .sb_tc_pool_bind_set            = mlxsw_devlink_sb_tc_pool_bind_set,
 980         .sb_occ_snapshot                = mlxsw_devlink_sb_occ_snapshot,
 981         .sb_occ_max_clear               = mlxsw_devlink_sb_occ_max_clear,
 982         .sb_occ_port_pool_get           = mlxsw_devlink_sb_occ_port_pool_get,
 983         .sb_occ_tc_port_bind_get        = mlxsw_devlink_sb_occ_tc_port_bind_get,
 984 };
 985
 986 int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 987                                    const struct mlxsw_bus *mlxsw_bus,
 988                                    void *bus_priv)
 989 {
 990         const char *device_kind = mlxsw_bus_info->device_kind;
 991         struct mlxsw_core *mlxsw_core;
 992         struct mlxsw_driver *mlxsw_driver;
 993         struct devlink *devlink;
 994         size_t alloc_size;
 995         int err;
 996
 997         mlxsw_driver = mlxsw_core_driver_get(device_kind);
 998         if (!mlxsw_driver)
 999                 return -EINVAL;
1000         alloc_size = sizeof(*mlxsw_core) + mlxsw_driver->priv_size;
1001         devlink = devlink_alloc(&mlxsw_devlink_ops, alloc_size);
1002         if (!devlink) {
1003                 err = -ENOMEM;
1004                 goto err_devlink_alloc;
1005         }
1006
1007         mlxsw_core = devlink_priv(devlink);
1008         INIT_LIST_HEAD(&mlxsw_core->rx_listener_list);
1009         INIT_LIST_HEAD(&mlxsw_core->event_listener_list);
1010         mlxsw_core->driver = mlxsw_driver;
1011         mlxsw_core->bus = mlxsw_bus;
1012         mlxsw_core->bus_priv = bus_priv;
1013         mlxsw_core->bus_info = mlxsw_bus_info;
1014
1015         mlxsw_core->pcpu_stats =
1016                 netdev_alloc_pcpu_stats(struct mlxsw_core_pcpu_stats);
1017         if (!mlxsw_core->pcpu_stats) {
1018                 err = -ENOMEM;
1019                 goto err_alloc_stats;
1020         }
1021
1022         if (mlxsw_driver->profile->used_max_lag &&
1023             mlxsw_driver->profile->used_max_port_per_lag) {
1024                 alloc_size = sizeof(u8) * mlxsw_driver->profile->max_lag *
1025                              mlxsw_driver->profile->max_port_per_lag;
1026                 mlxsw_core->lag.mapping = kzalloc(alloc_size, GFP_KERNEL);
1027                 if (!mlxsw_core->lag.mapping) {
1028                         err = -ENOMEM;
1029                         goto err_alloc_lag_mapping;
1030                 }
1031         }
1032
1033         err = mlxsw_bus->init(bus_priv, mlxsw_core, mlxsw_driver->profile);
1034         if (err)
1035                 goto err_bus_init;
1036
1037         err = mlxsw_emad_init(mlxsw_core);
1038         if (err)
1039                 goto err_emad_init;
1040
1041         err = mlxsw_hwmon_init(mlxsw_core, mlxsw_bus_info, &mlxsw_core->hwmon);
1042         if (err)
1043                 goto err_hwmon_init;
1044
1045         err = devlink_register(devlink, mlxsw_bus_info->dev);
1046         if (err)
1047                 goto err_devlink_register;
1048
1049         err = mlxsw_driver->init(mlxsw_core, mlxsw_bus_info);
1050         if (err)
1051                 goto err_driver_init;
1052
1053         err = mlxsw_core_debugfs_init(mlxsw_core);
1054         if (err)
1055                 goto err_debugfs_init;
1056
1057         return 0;
1058
1059 err_debugfs_init:
1060         mlxsw_core->driver->fini(mlxsw_core);
1061 err_driver_init:
1062         devlink_unregister(devlink);
1063 err_devlink_register:
1064 err_hwmon_init:
1065         mlxsw_emad_fini(mlxsw_core);
1066 err_emad_init:
1067         mlxsw_bus->fini(bus_priv);
1068 err_bus_init:
1069         kfree(mlxsw_core->lag.mapping);
1070 err_alloc_lag_mapping:
1071         free_percpu(mlxsw_core->pcpu_stats);
1072 err_alloc_stats:
1073         devlink_free(devlink);
1074 err_devlink_alloc:
1075         mlxsw_core_driver_put(device_kind);
1076         return err;
1077 }
1078 EXPORT_SYMBOL(mlxsw_core_bus_device_register);
1079
1080 void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core)
1081 {
1082         const char *device_kind = mlxsw_core->bus_info->device_kind;
1083         struct devlink *devlink = priv_to_devlink(mlxsw_core);
1084
1085         mlxsw_core_debugfs_fini(mlxsw_core);
1086         mlxsw_core->driver->fini(mlxsw_core);
1087         devlink_unregister(devlink);
1088         mlxsw_emad_fini(mlxsw_core);
1089         mlxsw_core->bus->fini(mlxsw_core->bus_priv);
1090         kfree(mlxsw_core->lag.mapping);
1091         free_percpu(mlxsw_core->pcpu_stats);
1092         devlink_free(devlink);
1093         mlxsw_core_driver_put(device_kind);
1094 }
1095 EXPORT_SYMBOL(mlxsw_core_bus_device_unregister);
1096
1097 bool mlxsw_core_skb_transmit_busy(struct mlxsw_core *mlxsw_core,
1098                                   const struct mlxsw_tx_info *tx_info)
1099 {
1100         return mlxsw_core->bus->skb_transmit_busy(mlxsw_core->bus_priv,
1101                                                   tx_info);
1102 }
1103 EXPORT_SYMBOL(mlxsw_core_skb_transmit_busy);
1104
1105 int mlxsw_core_skb_transmit(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
1106                             const struct mlxsw_tx_info *tx_info)
1107 {
1108         return mlxsw_core->bus->skb_transmit(mlxsw_core->bus_priv, skb,
1109                                              tx_info);
1110 }
1111 EXPORT_SYMBOL(mlxsw_core_skb_transmit);
1112
1113 static bool __is_rx_listener_equal(const struct mlxsw_rx_listener *rxl_a,
1114                                    const struct mlxsw_rx_listener *rxl_b)
1115 {
1116         return (rxl_a->func == rxl_b->func &&
1117                 rxl_a->local_port == rxl_b->local_port &&
1118                 rxl_a->trap_id == rxl_b->trap_id);
1119 }
1120
1121 static struct mlxsw_rx_listener_item *
1122 __find_rx_listener_item(struct mlxsw_core *mlxsw_core,
1123                         const struct mlxsw_rx_listener *rxl,
1124                         void *priv)
1125 {
1126         struct mlxsw_rx_listener_item *rxl_item;
1127
1128         list_for_each_entry(rxl_item, &mlxsw_core->rx_listener_list, list) {
1129                 if (__is_rx_listener_equal(&rxl_item->rxl, rxl) &&
1130                     rxl_item->priv == priv)
1131                         return rxl_item;
1132         }
1133         return NULL;
1134 }
1135
1136 int mlxsw_core_rx_listener_register(struct mlxsw_core *mlxsw_core,
1137                                     const struct mlxsw_rx_listener *rxl,
1138                                     void *priv)
1139 {
1140         struct mlxsw_rx_listener_item *rxl_item;
1141
1142         rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv);
1143         if (rxl_item)
1144                 return -EEXIST;
1145         rxl_item = kmalloc(sizeof(*rxl_item), GFP_KERNEL);
1146         if (!rxl_item)
1147                 return -ENOMEM;
1148         rxl_item->rxl = *rxl;
1149         rxl_item->priv = priv;
1150
1151         list_add_rcu(&rxl_item->list, &mlxsw_core->rx_listener_list);
1152         return 0;
1153 }
1154 EXPORT_SYMBOL(mlxsw_core_rx_listener_register);
1155
1156 void mlxsw_core_rx_listener_unregister(struct mlxsw_core *mlxsw_core,
1157                                        const struct mlxsw_rx_listener *rxl,
1158                                        void *priv)
1159 {
1160         struct mlxsw_rx_listener_item *rxl_item;
1161
1162         rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv);
1163         if (!rxl_item)
1164                 return;
1165         list_del_rcu(&rxl_item->list);
1166         synchronize_rcu();
1167         kfree(rxl_item);
1168 }
1169 EXPORT_SYMBOL(mlxsw_core_rx_listener_unregister);
1170
1171 static void mlxsw_core_event_listener_func(struct sk_buff *skb, u8 local_port,
1172                                            void *priv)
1173 {
1174         struct mlxsw_event_listener_item *event_listener_item = priv;
1175         struct mlxsw_reg_info reg;
1176         char *payload;
1177         char *op_tlv = mlxsw_emad_op_tlv(skb);
1178         char *reg_tlv = mlxsw_emad_reg_tlv(skb);
1179
1180         reg.id = mlxsw_emad_op_tlv_register_id_get(op_tlv);
1181         reg.len = (mlxsw_emad_reg_tlv_len_get(reg_tlv) - 1) * sizeof(u32);
1182         payload = mlxsw_emad_reg_payload(op_tlv);
1183         event_listener_item->el.func(&reg, payload, event_listener_item->priv);
1184         dev_kfree_skb(skb);
1185 }
1186
1187 static bool __is_event_listener_equal(const struct mlxsw_event_listener *el_a,
1188                                       const struct mlxsw_event_listener *el_b)
1189 {
1190         return (el_a->func == el_b->func &&
1191                 el_a->trap_id == el_b->trap_id);
1192 }
1193
1194 static struct mlxsw_event_listener_item *
1195 __find_event_listener_item(struct mlxsw_core *mlxsw_core,
1196                            const struct mlxsw_event_listener *el,
1197                            void *priv)
1198 {
1199         struct mlxsw_event_listener_item *el_item;
1200
1201         list_for_each_entry(el_item, &mlxsw_core->event_listener_list, list) {
1202                 if (__is_event_listener_equal(&el_item->el, el) &&
1203                     el_item->priv == priv)
1204                         return el_item;
1205         }
1206         return NULL;
1207 }
1208
1209 int mlxsw_core_event_listener_register(struct mlxsw_core *mlxsw_core,
1210                                        const struct mlxsw_event_listener *el,
1211                                        void *priv)
1212 {
1213         int err;
1214         struct mlxsw_event_listener_item *el_item;
1215         const struct mlxsw_rx_listener rxl = {
1216                 .func = mlxsw_core_event_listener_func,
1217                 .local_port = MLXSW_PORT_DONT_CARE,
1218                 .trap_id = el->trap_id,
1219         };
1220
1221         el_item = __find_event_listener_item(mlxsw_core, el, priv);
1222         if (el_item)
1223                 return -EEXIST;
1224         el_item = kmalloc(sizeof(*el_item), GFP_KERNEL);
1225         if (!el_item)
1226                 return -ENOMEM;
1227         el_item->el = *el;
1228         el_item->priv = priv;
1229
1230         err = mlxsw_core_rx_listener_register(mlxsw_core, &rxl, el_item);
1231         if (err)
1232                 goto err_rx_listener_register;
1233
1234         /* No reason to save item if we did not manage to register an RX
1235          * listener for it.
1236          */
1237         list_add_rcu(&el_item->list, &mlxsw_core->event_listener_list);
1238
1239         return 0;
1240
1241 err_rx_listener_register:
1242         kfree(el_item);
1243         return err;
1244 }
1245 EXPORT_SYMBOL(mlxsw_core_event_listener_register);
1246
1247 void mlxsw_core_event_listener_unregister(struct mlxsw_core *mlxsw_core,
1248                                           const struct mlxsw_event_listener *el,
1249                                           void *priv)
1250 {
1251         struct mlxsw_event_listener_item *el_item;
1252         const struct mlxsw_rx_listener rxl = {
1253                 .func = mlxsw_core_event_listener_func,
1254                 .local_port = MLXSW_PORT_DONT_CARE,
1255                 .trap_id = el->trap_id,
1256         };
1257
1258         el_item = __find_event_listener_item(mlxsw_core, el, priv);
1259         if (!el_item)
1260                 return;
1261         mlxsw_core_rx_listener_unregister(mlxsw_core, &rxl, el_item);
1262         list_del(&el_item->list);
1263         kfree(el_item);
1264 }
1265 EXPORT_SYMBOL(mlxsw_core_event_listener_unregister);
1266
1267 static int mlxsw_core_reg_access_emad(struct mlxsw_core *mlxsw_core,
1268                                       const struct mlxsw_reg_info *reg,
1269                                       char *payload,
1270                                       enum mlxsw_core_reg_access_type type)
1271 {
1272         int err;
1273         char *op_tlv;
1274         struct sk_buff *skb;
1275         struct mlxsw_tx_info tx_info = {
1276                 .local_port = MLXSW_PORT_CPU_PORT,
1277                 .is_emad = true,
1278         };
1279
1280         skb = mlxsw_emad_alloc(mlxsw_core, reg->len);
1281         if (!skb)
1282                 return -ENOMEM;
1283
1284         mlxsw_emad_construct(skb, reg, payload, type, mlxsw_core);
1285         mlxsw_core->driver->txhdr_construct(skb, &tx_info);
1286
1287         dev_dbg(mlxsw_core->bus_info->dev, "EMAD send (tid=%llx)\n",
1288                 mlxsw_core->emad.tid);
1289         mlxsw_core_buf_dump_dbg(mlxsw_core, skb->data, skb->len);
1290
1291         err = mlxsw_emad_transmit(mlxsw_core, skb, &tx_info);
1292         if (!err) {
1293                 op_tlv = mlxsw_emad_op_tlv(mlxsw_core->emad.resp_skb);
1294                 memcpy(payload, mlxsw_emad_reg_payload(op_tlv),
1295                        reg->len);
1296
1297                 dev_dbg(mlxsw_core->bus_info->dev, "EMAD recv (tid=%llx)\n",
1298                         mlxsw_core->emad.tid - 1);
1299                 mlxsw_core_buf_dump_dbg(mlxsw_core,
1300                                         mlxsw_core->emad.resp_skb->data,
1301                                         mlxsw_core->emad.resp_skb->len);
1302
1303                 dev_kfree_skb(mlxsw_core->emad.resp_skb);
1304         }
1305
1306         return err;
1307 }
1308
1309 static int mlxsw_core_reg_access_cmd(struct mlxsw_core *mlxsw_core,
1310                                      const struct mlxsw_reg_info *reg,
1311                                      char *payload,
1312                                      enum mlxsw_core_reg_access_type type)
1313 {
1314         int err, n_retry;
1315         char *in_mbox, *out_mbox, *tmp;
1316
1317         in_mbox = mlxsw_cmd_mbox_alloc();
1318         if (!in_mbox)
1319                 return -ENOMEM;
1320
1321         out_mbox = mlxsw_cmd_mbox_alloc();
1322         if (!out_mbox) {
1323                 err = -ENOMEM;
1324                 goto free_in_mbox;
1325         }
1326
1327         mlxsw_emad_pack_op_tlv(in_mbox, reg, type, mlxsw_core);
1328         tmp = in_mbox + MLXSW_EMAD_OP_TLV_LEN * sizeof(u32);
1329         mlxsw_emad_pack_reg_tlv(tmp, reg, payload);
1330
1331         n_retry = 0;
1332 retry:
1333         err = mlxsw_cmd_access_reg(mlxsw_core, in_mbox, out_mbox);
1334         if (!err) {
1335                 err = mlxsw_emad_process_status(mlxsw_core, out_mbox);
1336                 if (err == -EAGAIN && n_retry++ < MLXSW_EMAD_MAX_RETRY)
1337                         goto retry;
1338         }
1339
1340         if (!err)
1341                 memcpy(payload, mlxsw_emad_reg_payload(out_mbox),
1342                        reg->len);
1343
1344         mlxsw_core->emad.tid++;
1345         mlxsw_cmd_mbox_free(out_mbox);
1346 free_in_mbox:
1347         mlxsw_cmd_mbox_free(in_mbox);
1348         return err;
1349 }
1350
1351 static int mlxsw_core_reg_access(struct mlxsw_core *mlxsw_core,
1352                                  const struct mlxsw_reg_info *reg,
1353                                  char *payload,
1354                                  enum mlxsw_core_reg_access_type type)
1355 {
1356         u64 cur_tid;
1357         int err;
1358
1359         if (mutex_lock_interruptible(&mlxsw_core->emad.lock)) {
1360                 dev_err(mlxsw_core->bus_info->dev, "Reg access interrupted (reg_id=%x(%s),type=%s)\n",
1361                         reg->id, mlxsw_reg_id_str(reg->id),
1362                         mlxsw_core_reg_access_type_str(type));
1363                 return -EINTR;
1364         }
1365
1366         cur_tid = mlxsw_core->emad.tid;
1367         dev_dbg(mlxsw_core->bus_info->dev, "Reg access (tid=%llx,reg_id=%x(%s),type=%s)\n",
1368                 cur_tid, reg->id, mlxsw_reg_id_str(reg->id),
1369                 mlxsw_core_reg_access_type_str(type));
1370
1371         /* During initialization EMAD interface is not available to us,
1372          * so we default to command interface. We switch to EMAD interface
1373          * after setting the appropriate traps.
1374          */
1375         if (!mlxsw_core->emad.use_emad)
1376                 err = mlxsw_core_reg_access_cmd(mlxsw_core, reg,
1377                                                 payload, type);
1378         else
1379                 err = mlxsw_core_reg_access_emad(mlxsw_core, reg,
1380                                                  payload, type);
1381
1382         if (err)
1383                 dev_err(mlxsw_core->bus_info->dev, "Reg access failed (tid=%llx,reg_id=%x(%s),type=%s)\n",
1384                         cur_tid, reg->id, mlxsw_reg_id_str(reg->id),
1385                         mlxsw_core_reg_access_type_str(type));
1386
1387         mutex_unlock(&mlxsw_core->emad.lock);
1388         return err;
1389 }
1390
1391 int mlxsw_reg_query(struct mlxsw_core *mlxsw_core,
1392                     const struct mlxsw_reg_info *reg, char *payload)
1393 {
1394         return mlxsw_core_reg_access(mlxsw_core, reg, payload,
1395                                      MLXSW_CORE_REG_ACCESS_TYPE_QUERY);
1396 }
1397 EXPORT_SYMBOL(mlxsw_reg_query);
1398
1399 int mlxsw_reg_write(struct mlxsw_core *mlxsw_core,
1400                     const struct mlxsw_reg_info *reg, char *payload)
1401 {
1402         return mlxsw_core_reg_access(mlxsw_core, reg, payload,
1403                                      MLXSW_CORE_REG_ACCESS_TYPE_WRITE);
1404 }
1405 EXPORT_SYMBOL(mlxsw_reg_write);
1406
1407 void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
1408                             struct mlxsw_rx_info *rx_info)
1409 {
1410         struct mlxsw_rx_listener_item *rxl_item;
1411         const struct mlxsw_rx_listener *rxl;
1412         struct mlxsw_core_pcpu_stats *pcpu_stats;
1413         u8 local_port;
1414         bool found = false;
1415
1416         if (rx_info->is_lag) {
1417                 dev_dbg_ratelimited(mlxsw_core->bus_info->dev, "%s: lag_id = %d, lag_port_index = 0x%x\n",
1418                                     __func__, rx_info->u.lag_id,
1419                                     rx_info->trap_id);
1420                 /* Upper layer does not care if the skb came from LAG or not,
1421                  * so just get the local_port for the lag port and push it up.
1422                  */
1423                 local_port = mlxsw_core_lag_mapping_get(mlxsw_core,
1424                                                         rx_info->u.lag_id,
1425                                                         rx_info->lag_port_index);
1426         } else {
1427                 local_port = rx_info->u.sys_port;
1428         }
1429
1430         dev_dbg_ratelimited(mlxsw_core->bus_info->dev, "%s: local_port = %d, trap_id = 0x%x\n",
1431                             __func__, local_port, rx_info->trap_id);
1432
1433         if ((rx_info->trap_id >= MLXSW_TRAP_ID_MAX) ||
1434             (local_port >= MLXSW_PORT_MAX_PORTS))
1435                 goto drop;
1436
1437         rcu_read_lock();
1438         list_for_each_entry_rcu(rxl_item, &mlxsw_core->rx_listener_list, list) {
1439                 rxl = &rxl_item->rxl;
1440                 if ((rxl->local_port == MLXSW_PORT_DONT_CARE ||
1441                      rxl->local_port == local_port) &&
1442                     rxl->trap_id == rx_info->trap_id) {
1443                         found = true;
1444                         break;
1445                 }
1446         }
1447         rcu_read_unlock();
1448         if (!found)
1449                 goto drop;
1450
1451         pcpu_stats = this_cpu_ptr(mlxsw_core->pcpu_stats);
1452         u64_stats_update_begin(&pcpu_stats->syncp);
1453         pcpu_stats->port_rx_packets[local_port]++;
1454         pcpu_stats->port_rx_bytes[local_port] += skb->len;
1455         pcpu_stats->trap_rx_packets[rx_info->trap_id]++;
1456         pcpu_stats->trap_rx_bytes[rx_info->trap_id] += skb->len;
1457         u64_stats_update_end(&pcpu_stats->syncp);
1458
1459         rxl->func(skb, local_port, rxl_item->priv);
1460         return;
1461
1462 drop:
1463         if (rx_info->trap_id >= MLXSW_TRAP_ID_MAX)
1464                 this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_invalid);
1465         else
1466                 this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_dropped[rx_info->trap_id]);
1467         if (local_port >= MLXSW_PORT_MAX_PORTS)
1468                 this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_invalid);
1469         else
1470                 this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_dropped[local_port]);
1471         dev_kfree_skb(skb);
1472 }
1473 EXPORT_SYMBOL(mlxsw_core_skb_receive);
1474
1475 static int mlxsw_core_lag_mapping_index(struct mlxsw_core *mlxsw_core,
1476                                         u16 lag_id, u8 port_index)
1477 {
1478         return mlxsw_core->driver->profile->max_port_per_lag * lag_id +
1479                port_index;
1480 }
1481
1482 void mlxsw_core_lag_mapping_set(struct mlxsw_core *mlxsw_core,
1483                                 u16 lag_id, u8 port_index, u8 local_port)
1484 {
1485         int index = mlxsw_core_lag_mapping_index(mlxsw_core,
1486                                                  lag_id, port_index);
1487
1488         mlxsw_core->lag.mapping[index] = local_port;
1489 }
1490 EXPORT_SYMBOL(mlxsw_core_lag_mapping_set);
1491
1492 u8 mlxsw_core_lag_mapping_get(struct mlxsw_core *mlxsw_core,
1493                               u16 lag_id, u8 port_index)
1494 {
1495         int index = mlxsw_core_lag_mapping_index(mlxsw_core,
1496                                                  lag_id, port_index);
1497
1498         return mlxsw_core->lag.mapping[index];
1499 }
1500 EXPORT_SYMBOL(mlxsw_core_lag_mapping_get);
1501
1502 void mlxsw_core_lag_mapping_clear(struct mlxsw_core *mlxsw_core,
1503                                   u16 lag_id, u8 local_port)
1504 {
1505         int i;
1506
1507         for (i = 0; i < mlxsw_core->driver->profile->max_port_per_lag; i++) {
1508                 int index = mlxsw_core_lag_mapping_index(mlxsw_core,
1509                                                          lag_id, i);
1510
1511                 if (mlxsw_core->lag.mapping[index] == local_port)
1512                         mlxsw_core->lag.mapping[index] = 0;
1513         }
1514 }
1515 EXPORT_SYMBOL(mlxsw_core_lag_mapping_clear);
1516
1517 int mlxsw_core_port_init(struct mlxsw_core *mlxsw_core,
1518                          struct mlxsw_core_port *mlxsw_core_port, u8 local_port,
1519                          struct net_device *dev, bool split, u32 split_group)
1520 {
1521         struct devlink *devlink = priv_to_devlink(mlxsw_core);
1522         struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;
1523
1524         if (split)
1525                 devlink_port_split_set(devlink_port, split_group);
1526         devlink_port_type_eth_set(devlink_port, dev);
1527         return devlink_port_register(devlink, devlink_port, local_port);
1528 }
1529 EXPORT_SYMBOL(mlxsw_core_port_init);
1530
1531 void mlxsw_core_port_fini(struct mlxsw_core_port *mlxsw_core_port)
1532 {
1533         struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;
1534
1535         devlink_port_unregister(devlink_port);
1536 }
1537 EXPORT_SYMBOL(mlxsw_core_port_fini);
1538
1539 int mlxsw_cmd_exec(struct mlxsw_core *mlxsw_core, u16 opcode, u8 opcode_mod,
1540                    u32 in_mod, bool out_mbox_direct,
1541                    char *in_mbox, size_t in_mbox_size,
1542                    char *out_mbox, size_t out_mbox_size)
1543 {
1544         u8 status;
1545         int err;
1546
1547         BUG_ON(in_mbox_size % sizeof(u32) || out_mbox_size % sizeof(u32));
1548         if (!mlxsw_core->bus->cmd_exec)
1549                 return -EOPNOTSUPP;
1550
1551         dev_dbg(mlxsw_core->bus_info->dev, "Cmd exec (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n",
1552                 opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod, in_mod);
1553         if (in_mbox) {
1554                 dev_dbg(mlxsw_core->bus_info->dev, "Input mailbox:\n");
1555                 mlxsw_core_buf_dump_dbg(mlxsw_core, in_mbox, in_mbox_size);
1556         }
1557
1558         err = mlxsw_core->bus->cmd_exec(mlxsw_core->bus_priv, opcode,
1559                                         opcode_mod, in_mod, out_mbox_direct,
1560                                         in_mbox, in_mbox_size,
1561                                         out_mbox, out_mbox_size, &status);
1562
1563         if (err == -EIO && status != MLXSW_CMD_STATUS_OK) {
1564                 dev_err(mlxsw_core->bus_info->dev, "Cmd exec failed (opcode=%x(%s),opcode_mod=%x,in_mod=%x,status=%x(%s))\n",
1565                         opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod,
1566                         in_mod, status, mlxsw_cmd_status_str(status));
1567         } else if (err == -ETIMEDOUT) {
1568                 dev_err(mlxsw_core->bus_info->dev, "Cmd exec timed-out (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n",
1569                         opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod,
1570                         in_mod);
1571         }
1572
1573         if (!err && out_mbox) {
1574                 dev_dbg(mlxsw_core->bus_info->dev, "Output mailbox:\n");
1575                 mlxsw_core_buf_dump_dbg(mlxsw_core, out_mbox, out_mbox_size);
1576         }
1577         return err;
1578 }
1579 EXPORT_SYMBOL(mlxsw_cmd_exec);
1580
1581 int mlxsw_core_schedule_dw(struct delayed_work *dwork, unsigned long delay)
1582 {
1583         return queue_delayed_work(mlxsw_wq, dwork, delay);
1584 }
1585 EXPORT_SYMBOL(mlxsw_core_schedule_dw);
1586
1587 static int __init mlxsw_core_module_init(void)
1588 {
1589         int err;
1590
1591         mlxsw_wq = create_workqueue(mlxsw_core_driver_name);
1592         if (!mlxsw_wq)
1593                 return -ENOMEM;
1594         mlxsw_core_dbg_root = debugfs_create_dir(mlxsw_core_driver_name, NULL);
1595         if (!mlxsw_core_dbg_root) {
1596                 err = -ENOMEM;
1597                 goto err_debugfs_create_dir;
1598         }
1599         return 0;
1600
1601 err_debugfs_create_dir:
1602         destroy_workqueue(mlxsw_wq);
1603         return err;
1604 }
1605
1606 static void __exit mlxsw_core_module_exit(void)
1607 {
1608         debugfs_remove_recursive(mlxsw_core_dbg_root);
1609         destroy_workqueue(mlxsw_wq);
1610 }
1611
1612 module_init(mlxsw_core_module_init);
1613 module_exit(mlxsw_core_module_exit);
1614
1615 MODULE_LICENSE("Dual BSD/GPL");
1616 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
1617 MODULE_DESCRIPTION("Mellanox switch device core driver");