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 <asm/byteorder.h>
  59
  60 #include "core.h"
  61 #include "item.h"
  62 #include "cmd.h"
  63 #include "port.h"
  64 #include "trap.h"
  65 #include "emad.h"
  66 #include "reg.h"
  67
  68 static LIST_HEAD(mlxsw_core_driver_list);
  69 static DEFINE_SPINLOCK(mlxsw_core_driver_list_lock);
  70
  71 static const char mlxsw_core_driver_name[] = "mlxsw_core";
  72
  73 static struct dentry *mlxsw_core_dbg_root;
  74
  75 struct mlxsw_core_pcpu_stats {
  76         u64                     trap_rx_packets[MLXSW_TRAP_ID_MAX];
  77         u64                     trap_rx_bytes[MLXSW_TRAP_ID_MAX];
  78         u64                     port_rx_packets[MLXSW_PORT_MAX_PORTS];
  79         u64                     port_rx_bytes[MLXSW_PORT_MAX_PORTS];
  80         struct u64_stats_sync   syncp;
  81         u32                     trap_rx_dropped[MLXSW_TRAP_ID_MAX];
  82         u32                     port_rx_dropped[MLXSW_PORT_MAX_PORTS];
  83         u32                     trap_rx_invalid;
  84         u32                     port_rx_invalid;
  85 };
  86
  87 struct mlxsw_core {
  88         struct mlxsw_driver *driver;
  89         const struct mlxsw_bus *bus;
  90         void *bus_priv;
  91         const struct mlxsw_bus_info *bus_info;
  92         struct list_head rx_listener_list;
  93         struct list_head event_listener_list;
  94         struct {
  95                 struct sk_buff *resp_skb;
  96                 u64 tid;
  97                 wait_queue_head_t wait;
  98                 bool trans_active;
  99                 struct mutex lock; /* One EMAD transaction at a time. */
 100                 bool use_emad;
 101         } emad;
 102         struct mlxsw_core_pcpu_stats __percpu *pcpu_stats;
 103         struct dentry *dbg_dir;
 104         struct {
 105                 struct debugfs_blob_wrapper vsd_blob;
 106                 struct debugfs_blob_wrapper psid_blob;
 107         } dbg;
 108         unsigned long driver_priv[0];
 109         /* driver_priv has to be always the last item */
 110 };
 111
 112 struct mlxsw_rx_listener_item {
 113         struct list_head list;
 114         struct mlxsw_rx_listener rxl;
 115         void *priv;
 116 };
 117
 118 struct mlxsw_event_listener_item {
 119         struct list_head list;
 120         struct mlxsw_event_listener el;
 121         void *priv;
 122 };
 123
 124 /******************
 125  * EMAD processing
 126  ******************/
 127
 128 /* emad_eth_hdr_dmac
 129  * Destination MAC in EMAD's Ethernet header.
 130  * Must be set to 01:02:c9:00:00:01
 131  */
 132 MLXSW_ITEM_BUF(emad, eth_hdr, dmac, 0x00, 6);
 133
 134 /* emad_eth_hdr_smac
 135  * Source MAC in EMAD's Ethernet header.
 136  * Must be set to 00:02:c9:01:02:03
 137  */
 138 MLXSW_ITEM_BUF(emad, eth_hdr, smac, 0x06, 6);
 139
 140 /* emad_eth_hdr_ethertype
 141  * Ethertype in EMAD's Ethernet header.
 142  * Must be set to 0x8932
 143  */
 144 MLXSW_ITEM32(emad, eth_hdr, ethertype, 0x0C, 16, 16);
 145
 146 /* emad_eth_hdr_mlx_proto
 147  * Mellanox protocol.
 148  * Must be set to 0x0.
 149  */
 150 MLXSW_ITEM32(emad, eth_hdr, mlx_proto, 0x0C, 8, 8);
 151
 152 /* emad_eth_hdr_ver
 153  * Mellanox protocol version.
 154  * Must be set to 0x0.
 155  */
 156 MLXSW_ITEM32(emad, eth_hdr, ver, 0x0C, 4, 4);
 157
 158 /* emad_op_tlv_type
 159  * Type of the TLV.
 160  * Must be set to 0x1 (operation TLV).
 161  */
 162 MLXSW_ITEM32(emad, op_tlv, type, 0x00, 27, 5);
 163
 164 /* emad_op_tlv_len
 165  * Length of the operation TLV in u32.
 166  * Must be set to 0x4.
 167  */
 168 MLXSW_ITEM32(emad, op_tlv, len, 0x00, 16, 11);
 169
 170 /* emad_op_tlv_dr
 171  * Direct route bit. Setting to 1 indicates the EMAD is a direct route
 172  * EMAD. DR TLV must follow.
 173  *
 174  * Note: Currently not supported and must not be set.
 175  */
 176 MLXSW_ITEM32(emad, op_tlv, dr, 0x00, 15, 1);
 177
 178 /* emad_op_tlv_status
 179  * Returned status in case of EMAD response. Must be set to 0 in case
 180  * of EMAD request.
 181  * 0x0 - success
 182  * 0x1 - device is busy. Requester should retry
 183  * 0x2 - Mellanox protocol version not supported
 184  * 0x3 - unknown TLV
 185  * 0x4 - register not supported
 186  * 0x5 - operation class not supported
 187  * 0x6 - EMAD method not supported
 188  * 0x7 - bad parameter (e.g. port out of range)
 189  * 0x8 - resource not available
 190  * 0x9 - message receipt acknowledgment. Requester should retry
 191  * 0x70 - internal error
 192  */
 193 MLXSW_ITEM32(emad, op_tlv, status, 0x00, 8, 7);
 194
 195 /* emad_op_tlv_register_id
 196  * Register ID of register within register TLV.
 197  */
 198 MLXSW_ITEM32(emad, op_tlv, register_id, 0x04, 16, 16);
 199
 200 /* emad_op_tlv_r
 201  * Response bit. Setting to 1 indicates Response, otherwise request.
 202  */
 203 MLXSW_ITEM32(emad, op_tlv, r, 0x04, 15, 1);
 204
 205 /* emad_op_tlv_method
 206  * EMAD method type.
 207  * 0x1 - query
 208  * 0x2 - write
 209  * 0x3 - send (currently not supported)
 210  * 0x4 - event
 211  */
 212 MLXSW_ITEM32(emad, op_tlv, method, 0x04, 8, 7);
 213
 214 /* emad_op_tlv_class
 215  * EMAD operation class. Must be set to 0x1 (REG_ACCESS).
 216  */
 217 MLXSW_ITEM32(emad, op_tlv, class, 0x04, 0, 8);
 218
 219 /* emad_op_tlv_tid
 220  * EMAD transaction ID. Used for pairing request and response EMADs.
 221  */
 222 MLXSW_ITEM64(emad, op_tlv, tid, 0x08, 0, 64);
 223
 224 /* emad_reg_tlv_type
 225  * Type of the TLV.
 226  * Must be set to 0x3 (register TLV).
 227  */
 228 MLXSW_ITEM32(emad, reg_tlv, type, 0x00, 27, 5);
 229
 230 /* emad_reg_tlv_len
 231  * Length of the operation TLV in u32.
 232  */
 233 MLXSW_ITEM32(emad, reg_tlv, len, 0x00, 16, 11);
 234
 235 /* emad_end_tlv_type
 236  * Type of the TLV.
 237  * Must be set to 0x0 (end TLV).
 238  */
 239 MLXSW_ITEM32(emad, end_tlv, type, 0x00, 27, 5);
 240
 241 /* emad_end_tlv_len
 242  * Length of the end TLV in u32.
 243  * Must be set to 1.
 244  */
 245 MLXSW_ITEM32(emad, end_tlv, len, 0x00, 16, 11);
 246
 247 enum mlxsw_core_reg_access_type {
 248         MLXSW_CORE_REG_ACCESS_TYPE_QUERY,
 249         MLXSW_CORE_REG_ACCESS_TYPE_WRITE,
 250 };
 251
 252 static inline const char *
 253 mlxsw_core_reg_access_type_str(enum mlxsw_core_reg_access_type type)
 254 {
 255         switch (type) {
 256         case MLXSW_CORE_REG_ACCESS_TYPE_QUERY:
 257                 return "query";
 258         case MLXSW_CORE_REG_ACCESS_TYPE_WRITE:
 259                 return "write";
 260         }
 261         BUG();
 262 }
 263
 264 static void mlxsw_emad_pack_end_tlv(char *end_tlv)
 265 {
 266         mlxsw_emad_end_tlv_type_set(end_tlv, MLXSW_EMAD_TLV_TYPE_END);
 267         mlxsw_emad_end_tlv_len_set(end_tlv, MLXSW_EMAD_END_TLV_LEN);
 268 }
 269
 270 static void mlxsw_emad_pack_reg_tlv(char *reg_tlv,
 271                                     const struct mlxsw_reg_info *reg,
 272                                     char *payload)
 273 {
 274         mlxsw_emad_reg_tlv_type_set(reg_tlv, MLXSW_EMAD_TLV_TYPE_REG);
 275         mlxsw_emad_reg_tlv_len_set(reg_tlv, reg->len / sizeof(u32) + 1);
 276         memcpy(reg_tlv + sizeof(u32), payload, reg->len);
 277 }
 278
 279 static void mlxsw_emad_pack_op_tlv(char *op_tlv,
 280                                    const struct mlxsw_reg_info *reg,
 281                                    enum mlxsw_core_reg_access_type type,
 282                                    struct mlxsw_core *mlxsw_core)
 283 {
 284         mlxsw_emad_op_tlv_type_set(op_tlv, MLXSW_EMAD_TLV_TYPE_OP);
 285         mlxsw_emad_op_tlv_len_set(op_tlv, MLXSW_EMAD_OP_TLV_LEN);
 286         mlxsw_emad_op_tlv_dr_set(op_tlv, 0);
 287         mlxsw_emad_op_tlv_status_set(op_tlv, 0);
 288         mlxsw_emad_op_tlv_register_id_set(op_tlv, reg->id);
 289         mlxsw_emad_op_tlv_r_set(op_tlv, MLXSW_EMAD_OP_TLV_REQUEST);
 290         if (MLXSW_CORE_REG_ACCESS_TYPE_QUERY == type)
 291                 mlxsw_emad_op_tlv_method_set(op_tlv,
 292                                              MLXSW_EMAD_OP_TLV_METHOD_QUERY);
 293         else
 294                 mlxsw_emad_op_tlv_method_set(op_tlv,
 295                                              MLXSW_EMAD_OP_TLV_METHOD_WRITE);
 296         mlxsw_emad_op_tlv_class_set(op_tlv,
 297                                     MLXSW_EMAD_OP_TLV_CLASS_REG_ACCESS);
 298         mlxsw_emad_op_tlv_tid_set(op_tlv, mlxsw_core->emad.tid);
 299 }
 300
 301 static int mlxsw_emad_construct_eth_hdr(struct sk_buff *skb)
 302 {
 303         char *eth_hdr = skb_push(skb, MLXSW_EMAD_ETH_HDR_LEN);
 304
 305         mlxsw_emad_eth_hdr_dmac_memcpy_to(eth_hdr, MLXSW_EMAD_EH_DMAC);
 306         mlxsw_emad_eth_hdr_smac_memcpy_to(eth_hdr, MLXSW_EMAD_EH_SMAC);
 307         mlxsw_emad_eth_hdr_ethertype_set(eth_hdr, MLXSW_EMAD_EH_ETHERTYPE);
 308         mlxsw_emad_eth_hdr_mlx_proto_set(eth_hdr, MLXSW_EMAD_EH_MLX_PROTO);
 309         mlxsw_emad_eth_hdr_ver_set(eth_hdr, MLXSW_EMAD_EH_PROTO_VERSION);
 310
 311         skb_reset_mac_header(skb);
 312
 313         return 0;
 314 }
 315
 316 static void mlxsw_emad_construct(struct sk_buff *skb,
 317                                  const struct mlxsw_reg_info *reg,
 318                                  char *payload,
 319                                  enum mlxsw_core_reg_access_type type,
 320                                  struct mlxsw_core *mlxsw_core)
 321 {
 322         char *buf;
 323
 324         buf = skb_push(skb, MLXSW_EMAD_END_TLV_LEN * sizeof(u32));
 325         mlxsw_emad_pack_end_tlv(buf);
 326
 327         buf = skb_push(skb, reg->len + sizeof(u32));
 328         mlxsw_emad_pack_reg_tlv(buf, reg, payload);
 329
 330         buf = skb_push(skb, MLXSW_EMAD_OP_TLV_LEN * sizeof(u32));
 331         mlxsw_emad_pack_op_tlv(buf, reg, type, mlxsw_core);
 332
 333         mlxsw_emad_construct_eth_hdr(skb);
 334 }
 335
 336 static char *mlxsw_emad_op_tlv(const struct sk_buff *skb)
 337 {
 338         return ((char *) (skb->data + MLXSW_EMAD_ETH_HDR_LEN));
 339 }
 340
 341 static char *mlxsw_emad_reg_tlv(const struct sk_buff *skb)
 342 {
 343         return ((char *) (skb->data + MLXSW_EMAD_ETH_HDR_LEN +
 344                                       MLXSW_EMAD_OP_TLV_LEN * sizeof(u32)));
 345 }
 346
 347 static char *mlxsw_emad_reg_payload(const char *op_tlv)
 348 {
 349         return ((char *) (op_tlv + (MLXSW_EMAD_OP_TLV_LEN + 1) * sizeof(u32)));
 350 }
 351
 352 static u64 mlxsw_emad_get_tid(const struct sk_buff *skb)
 353 {
 354         char *op_tlv;
 355
 356         op_tlv = mlxsw_emad_op_tlv(skb);
 357         return mlxsw_emad_op_tlv_tid_get(op_tlv);
 358 }
 359
 360 static bool mlxsw_emad_is_resp(const struct sk_buff *skb)
 361 {
 362         char *op_tlv;
 363
 364         op_tlv = mlxsw_emad_op_tlv(skb);
 365         return (MLXSW_EMAD_OP_TLV_RESPONSE == mlxsw_emad_op_tlv_r_get(op_tlv));
 366 }
 367
 368 #define MLXSW_EMAD_TIMEOUT_MS 200
 369
 370 static int __mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core,
 371                                  struct sk_buff *skb,
 372                                  const struct mlxsw_tx_info *tx_info)
 373 {
 374         int err;
 375         int ret;
 376
 377         mlxsw_core->emad.trans_active = true;
 378
 379         err = mlxsw_core_skb_transmit(mlxsw_core->driver_priv, skb, tx_info);
 380         if (err) {
 381                 dev_err(mlxsw_core->bus_info->dev, "Failed to transmit EMAD (tid=%llx)\n",
 382                         mlxsw_core->emad.tid);
 383                 dev_kfree_skb(skb);
 384                 goto trans_inactive_out;
 385         }
 386
 387         ret = wait_event_timeout(mlxsw_core->emad.wait,
 388                                  !(mlxsw_core->emad.trans_active),
 389                                  msecs_to_jiffies(MLXSW_EMAD_TIMEOUT_MS));
 390         if (!ret) {
 391                 dev_warn(mlxsw_core->bus_info->dev, "EMAD timed-out (tid=%llx)\n",
 392                          mlxsw_core->emad.tid);
 393                 err = -EIO;
 394                 goto trans_inactive_out;
 395         }
 396
 397         return 0;
 398
 399 trans_inactive_out:
 400         mlxsw_core->emad.trans_active = false;
 401         return err;
 402 }
 403
 404 static int mlxsw_emad_process_status(struct mlxsw_core *mlxsw_core,
 405                                      char *op_tlv)
 406 {
 407         enum mlxsw_emad_op_tlv_status status;
 408         u64 tid;
 409
 410         status = mlxsw_emad_op_tlv_status_get(op_tlv);
 411         tid = mlxsw_emad_op_tlv_tid_get(op_tlv);
 412
 413         switch (status) {
 414         case MLXSW_EMAD_OP_TLV_STATUS_SUCCESS:
 415                 return 0;
 416         case MLXSW_EMAD_OP_TLV_STATUS_BUSY:
 417         case MLXSW_EMAD_OP_TLV_STATUS_MESSAGE_RECEIPT_ACK:
 418                 dev_warn(mlxsw_core->bus_info->dev, "Reg access status again (tid=%llx,status=%x(%s))\n",
 419                          tid, status, mlxsw_emad_op_tlv_status_str(status));
 420                 return -EAGAIN;
 421         case MLXSW_EMAD_OP_TLV_STATUS_VERSION_NOT_SUPPORTED:
 422         case MLXSW_EMAD_OP_TLV_STATUS_UNKNOWN_TLV:
 423         case MLXSW_EMAD_OP_TLV_STATUS_REGISTER_NOT_SUPPORTED:
 424         case MLXSW_EMAD_OP_TLV_STATUS_CLASS_NOT_SUPPORTED:
 425         case MLXSW_EMAD_OP_TLV_STATUS_METHOD_NOT_SUPPORTED:
 426         case MLXSW_EMAD_OP_TLV_STATUS_BAD_PARAMETER:
 427         case MLXSW_EMAD_OP_TLV_STATUS_RESOURCE_NOT_AVAILABLE:
 428         case MLXSW_EMAD_OP_TLV_STATUS_INTERNAL_ERROR:
 429         default:
 430                 dev_err(mlxsw_core->bus_info->dev, "Reg access status failed (tid=%llx,status=%x(%s))\n",
 431                         tid, status, mlxsw_emad_op_tlv_status_str(status));
 432                 return -EIO;
 433         }
 434 }
 435
 436 static int mlxsw_emad_process_status_skb(struct mlxsw_core *mlxsw_core,
 437                                          struct sk_buff *skb)
 438 {
 439         return mlxsw_emad_process_status(mlxsw_core, mlxsw_emad_op_tlv(skb));
 440 }
 441
 442 static int mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core,
 443                                struct sk_buff *skb,
 444                                const struct mlxsw_tx_info *tx_info)
 445 {
 446         struct sk_buff *trans_skb;
 447         int n_retry;
 448         int err;
 449
 450         n_retry = 0;
 451 retry:
 452         /* We copy the EMAD to a new skb, since we might need
 453          * to retransmit it in case of failure.
 454          */
 455         trans_skb = skb_copy(skb, GFP_KERNEL);
 456         if (!trans_skb) {
 457                 err = -ENOMEM;
 458                 goto out;
 459         }
 460
 461         err = __mlxsw_emad_transmit(mlxsw_core, trans_skb, tx_info);
 462         if (!err) {
 463                 struct sk_buff *resp_skb = mlxsw_core->emad.resp_skb;
 464
 465                 err = mlxsw_emad_process_status_skb(mlxsw_core, resp_skb);
 466                 if (err)
 467                         dev_kfree_skb(resp_skb);
 468                 if (!err || err != -EAGAIN)
 469                         goto out;
 470         }
 471         if (n_retry++ < MLXSW_EMAD_MAX_RETRY)
 472                 goto retry;
 473
 474 out:
 475         dev_kfree_skb(skb);
 476         mlxsw_core->emad.tid++;
 477         return err;
 478 }
 479
 480 static void mlxsw_emad_rx_listener_func(struct sk_buff *skb, u8 local_port,
 481                                         void *priv)
 482 {
 483         struct mlxsw_core *mlxsw_core = priv;
 484
 485         if (mlxsw_emad_is_resp(skb) &&
 486             mlxsw_core->emad.trans_active &&
 487             mlxsw_emad_get_tid(skb) == mlxsw_core->emad.tid) {
 488                 mlxsw_core->emad.resp_skb = skb;
 489                 mlxsw_core->emad.trans_active = false;
 490                 wake_up(&mlxsw_core->emad.wait);
 491         } else {
 492                 dev_kfree_skb(skb);
 493         }
 494 }
 495
 496 static const struct mlxsw_rx_listener mlxsw_emad_rx_listener = {
 497         .func = mlxsw_emad_rx_listener_func,
 498         .local_port = MLXSW_PORT_DONT_CARE,
 499         .trap_id = MLXSW_TRAP_ID_ETHEMAD,
 500 };
 501
 502 static int mlxsw_emad_traps_set(struct mlxsw_core *mlxsw_core)
 503 {
 504         char htgt_pl[MLXSW_REG_HTGT_LEN];
 505         char hpkt_pl[MLXSW_REG_HPKT_LEN];
 506         int err;
 507
 508         mlxsw_reg_htgt_pack(htgt_pl, MLXSW_REG_HTGT_TRAP_GROUP_EMAD);
 509         err = mlxsw_reg_write(mlxsw_core, MLXSW_REG(htgt), htgt_pl);
 510         if (err)
 511                 return err;
 512
 513         mlxsw_reg_hpkt_pack(hpkt_pl, MLXSW_REG_HPKT_ACTION_TRAP_TO_CPU,
 514                             MLXSW_REG_HTGT_TRAP_GROUP_EMAD,
 515                             MLXSW_TRAP_ID_ETHEMAD);
 516         return mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl);
 517 }
 518
 519 static int mlxsw_emad_init(struct mlxsw_core *mlxsw_core)
 520 {
 521         int err;
 522
 523         /* Set the upper 32 bits of the transaction ID field to a random
 524          * number. This allows us to discard EMADs addressed to other
 525          * devices.
 526          */
 527         get_random_bytes(&mlxsw_core->emad.tid, 4);
 528         mlxsw_core->emad.tid = mlxsw_core->emad.tid << 32;
 529
 530         init_waitqueue_head(&mlxsw_core->emad.wait);
 531         mlxsw_core->emad.trans_active = false;
 532         mutex_init(&mlxsw_core->emad.lock);
 533
 534         err = mlxsw_core_rx_listener_register(mlxsw_core,
 535                                               &mlxsw_emad_rx_listener,
 536                                               mlxsw_core);
 537         if (err)
 538                 return err;
 539
 540         err = mlxsw_emad_traps_set(mlxsw_core);
 541         if (err)
 542                 goto err_emad_trap_set;
 543
 544         mlxsw_core->emad.use_emad = true;
 545
 546         return 0;
 547
 548 err_emad_trap_set:
 549         mlxsw_core_rx_listener_unregister(mlxsw_core,
 550                                           &mlxsw_emad_rx_listener,
 551                                           mlxsw_core);
 552         return err;
 553 }
 554
 555 static void mlxsw_emad_fini(struct mlxsw_core *mlxsw_core)
 556 {
 557         char hpkt_pl[MLXSW_REG_HPKT_LEN];
 558
 559         mlxsw_reg_hpkt_pack(hpkt_pl, MLXSW_REG_HPKT_ACTION_DISCARD,
 560                             MLXSW_REG_HTGT_TRAP_GROUP_EMAD,
 561                             MLXSW_TRAP_ID_ETHEMAD);
 562         mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl);
 563
 564         mlxsw_core_rx_listener_unregister(mlxsw_core,
 565                                           &mlxsw_emad_rx_listener,
 566                                           mlxsw_core);
 567 }
 568
 569 static struct sk_buff *mlxsw_emad_alloc(const struct mlxsw_core *mlxsw_core,
 570                                         u16 reg_len)
 571 {
 572         struct sk_buff *skb;
 573         u16 emad_len;
 574
 575         emad_len = (reg_len + sizeof(u32) + MLXSW_EMAD_ETH_HDR_LEN +
 576                     (MLXSW_EMAD_OP_TLV_LEN + MLXSW_EMAD_END_TLV_LEN) *
 577                     sizeof(u32) + mlxsw_core->driver->txhdr_len);
 578         if (emad_len > MLXSW_EMAD_MAX_FRAME_LEN)
 579                 return NULL;
 580
 581         skb = netdev_alloc_skb(NULL, emad_len);
 582         if (!skb)
 583                 return NULL;
 584         memset(skb->data, 0, emad_len);
 585         skb_reserve(skb, emad_len);
 586
 587         return skb;
 588 }
 589
 590 /*****************
 591  * Core functions
 592  *****************/
 593
 594 static int mlxsw_core_rx_stats_dbg_read(struct seq_file *file, void *data)
 595 {
 596         struct mlxsw_core *mlxsw_core = file->private;
 597         struct mlxsw_core_pcpu_stats *p;
 598         u64 rx_packets, rx_bytes;
 599         u64 tmp_rx_packets, tmp_rx_bytes;
 600         u32 rx_dropped, rx_invalid;
 601         unsigned int start;
 602         int i;
 603         int j;
 604         static const char hdr[] =
 605                 "     NUM   RX_PACKETS     RX_BYTES RX_DROPPED\n";
 606
 607         seq_printf(file, hdr);
 608         for (i = 0; i < MLXSW_TRAP_ID_MAX; i++) {
 609                 rx_packets = 0;
 610                 rx_bytes = 0;
 611                 rx_dropped = 0;
 612                 for_each_possible_cpu(j) {
 613                         p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
 614                         do {
 615                                 start = u64_stats_fetch_begin(&p->syncp);
 616                                 tmp_rx_packets = p->trap_rx_packets[i];
 617                                 tmp_rx_bytes = p->trap_rx_bytes[i];
 618                         } while (u64_stats_fetch_retry(&p->syncp, start));
 619
 620                         rx_packets += tmp_rx_packets;
 621                         rx_bytes += tmp_rx_bytes;
 622                         rx_dropped += p->trap_rx_dropped[i];
 623                 }
 624                 seq_printf(file, "trap %3d %12llu %12llu %10u\n",
 625                            i, rx_packets, rx_bytes, rx_dropped);
 626         }
 627         rx_invalid = 0;
 628         for_each_possible_cpu(j) {
 629                 p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
 630                 rx_invalid += p->trap_rx_invalid;
 631         }
 632         seq_printf(file, "trap INV                           %10u\n",
 633                    rx_invalid);
 634
 635         for (i = 0; i < MLXSW_PORT_MAX_PORTS; i++) {
 636                 rx_packets = 0;
 637                 rx_bytes = 0;
 638                 rx_dropped = 0;
 639                 for_each_possible_cpu(j) {
 640                         p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
 641                         do {
 642                                 start = u64_stats_fetch_begin(&p->syncp);
 643                                 tmp_rx_packets = p->port_rx_packets[i];
 644                                 tmp_rx_bytes = p->port_rx_bytes[i];
 645                         } while (u64_stats_fetch_retry(&p->syncp, start));
 646
 647                         rx_packets += tmp_rx_packets;
 648                         rx_bytes += tmp_rx_bytes;
 649                         rx_dropped += p->port_rx_dropped[i];
 650                 }
 651                 seq_printf(file, "port %3d %12llu %12llu %10u\n",
 652                            i, rx_packets, rx_bytes, rx_dropped);
 653         }
 654         rx_invalid = 0;
 655         for_each_possible_cpu(j) {
 656                 p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
 657                 rx_invalid += p->port_rx_invalid;
 658         }
 659         seq_printf(file, "port INV                           %10u\n",
 660                    rx_invalid);
 661         return 0;
 662 }
 663
 664 static int mlxsw_core_rx_stats_dbg_open(struct inode *inode, struct file *f)
 665 {
 666         struct mlxsw_core *mlxsw_core = inode->i_private;
 667
 668         return single_open(f, mlxsw_core_rx_stats_dbg_read, mlxsw_core);
 669 }
 670
 671 static const struct file_operations mlxsw_core_rx_stats_dbg_ops = {
 672         .owner = THIS_MODULE,
 673         .open = mlxsw_core_rx_stats_dbg_open,
 674         .release = single_release,
 675         .read = seq_read,
 676         .llseek = seq_lseek
 677 };
 678
 679 static void mlxsw_core_buf_dump_dbg(struct mlxsw_core *mlxsw_core,
 680                                     const char *buf, size_t size)
 681 {
 682         __be32 *m = (__be32 *) buf;
 683         int i;
 684         int count = size / sizeof(__be32);
 685
 686         for (i = count - 1; i >= 0; i--)
 687                 if (m[i])
 688                         break;
 689         i++;
 690         count = i ? i : 1;
 691         for (i = 0; i < count; i += 4)
 692                 dev_dbg(mlxsw_core->bus_info->dev, "%04x - %08x %08x %08x %08x\n",
 693                         i * 4, be32_to_cpu(m[i]), be32_to_cpu(m[i + 1]),
 694                         be32_to_cpu(m[i + 2]), be32_to_cpu(m[i + 3]));
 695 }
 696
 697 int mlxsw_core_driver_register(struct mlxsw_driver *mlxsw_driver)
 698 {
 699         spin_lock(&mlxsw_core_driver_list_lock);
 700         list_add_tail(&mlxsw_driver->list, &mlxsw_core_driver_list);
 701         spin_unlock(&mlxsw_core_driver_list_lock);
 702         return 0;
 703 }
 704 EXPORT_SYMBOL(mlxsw_core_driver_register);
 705
 706 void mlxsw_core_driver_unregister(struct mlxsw_driver *mlxsw_driver)
 707 {
 708         spin_lock(&mlxsw_core_driver_list_lock);
 709         list_del(&mlxsw_driver->list);
 710         spin_unlock(&mlxsw_core_driver_list_lock);
 711 }
 712 EXPORT_SYMBOL(mlxsw_core_driver_unregister);
 713
 714 static struct mlxsw_driver *__driver_find(const char *kind)
 715 {
 716         struct mlxsw_driver *mlxsw_driver;
 717
 718         list_for_each_entry(mlxsw_driver, &mlxsw_core_driver_list, list) {
 719                 if (strcmp(mlxsw_driver->kind, kind) == 0)
 720                         return mlxsw_driver;
 721         }
 722         return NULL;
 723 }
 724
 725 static struct mlxsw_driver *mlxsw_core_driver_get(const char *kind)
 726 {
 727         struct mlxsw_driver *mlxsw_driver;
 728
 729         spin_lock(&mlxsw_core_driver_list_lock);
 730         mlxsw_driver = __driver_find(kind);
 731         if (!mlxsw_driver) {
 732                 spin_unlock(&mlxsw_core_driver_list_lock);
 733                 request_module(MLXSW_MODULE_ALIAS_PREFIX "%s", kind);
 734                 spin_lock(&mlxsw_core_driver_list_lock);
 735                 mlxsw_driver = __driver_find(kind);
 736         }
 737         if (mlxsw_driver) {
 738                 if (!try_module_get(mlxsw_driver->owner))
 739                         mlxsw_driver = NULL;
 740         }
 741
 742         spin_unlock(&mlxsw_core_driver_list_lock);
 743         return mlxsw_driver;
 744 }
 745
 746 static void mlxsw_core_driver_put(const char *kind)
 747 {
 748         struct mlxsw_driver *mlxsw_driver;
 749
 750         spin_lock(&mlxsw_core_driver_list_lock);
 751         mlxsw_driver = __driver_find(kind);
 752         spin_unlock(&mlxsw_core_driver_list_lock);
 753         if (!mlxsw_driver)
 754                 return;
 755         module_put(mlxsw_driver->owner);
 756 }
 757
 758 static int mlxsw_core_debugfs_init(struct mlxsw_core *mlxsw_core)
 759 {
 760         const struct mlxsw_bus_info *bus_info = mlxsw_core->bus_info;
 761
 762         mlxsw_core->dbg_dir = debugfs_create_dir(bus_info->device_name,
 763                                                  mlxsw_core_dbg_root);
 764         if (!mlxsw_core->dbg_dir)
 765                 return -ENOMEM;
 766         debugfs_create_file("rx_stats", S_IRUGO, mlxsw_core->dbg_dir,
 767                             mlxsw_core, &mlxsw_core_rx_stats_dbg_ops);
 768         mlxsw_core->dbg.vsd_blob.data = (void *) &bus_info->vsd;
 769         mlxsw_core->dbg.vsd_blob.size = sizeof(bus_info->vsd);
 770         debugfs_create_blob("vsd", S_IRUGO, mlxsw_core->dbg_dir,
 771                             &mlxsw_core->dbg.vsd_blob);
 772         mlxsw_core->dbg.psid_blob.data = (void *) &bus_info->psid;
 773         mlxsw_core->dbg.psid_blob.size = sizeof(bus_info->psid);
 774         debugfs_create_blob("psid", S_IRUGO, mlxsw_core->dbg_dir,
 775                             &mlxsw_core->dbg.psid_blob);
 776         return 0;
 777 }
 778
 779 static void mlxsw_core_debugfs_fini(struct mlxsw_core *mlxsw_core)
 780 {
 781         debugfs_remove_recursive(mlxsw_core->dbg_dir);
 782 }
 783
 784 int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 785                                    const struct mlxsw_bus *mlxsw_bus,
 786                                    void *bus_priv)
 787 {
 788         const char *device_kind = mlxsw_bus_info->device_kind;
 789         struct mlxsw_core *mlxsw_core;
 790         struct mlxsw_driver *mlxsw_driver;
 791         size_t alloc_size;
 792         int err;
 793
 794         mlxsw_driver = mlxsw_core_driver_get(device_kind);
 795         if (!mlxsw_driver)
 796                 return -EINVAL;
 797         alloc_size = sizeof(*mlxsw_core) + mlxsw_driver->priv_size;
 798         mlxsw_core = kzalloc(alloc_size, GFP_KERNEL);
 799         if (!mlxsw_core) {
 800                 err = -ENOMEM;
 801                 goto err_core_alloc;
 802         }
 803
 804         INIT_LIST_HEAD(&mlxsw_core->rx_listener_list);
 805         INIT_LIST_HEAD(&mlxsw_core->event_listener_list);
 806         mlxsw_core->driver = mlxsw_driver;
 807         mlxsw_core->bus = mlxsw_bus;
 808         mlxsw_core->bus_priv = bus_priv;
 809         mlxsw_core->bus_info = mlxsw_bus_info;
 810
 811         mlxsw_core->pcpu_stats =
 812                 netdev_alloc_pcpu_stats(struct mlxsw_core_pcpu_stats);
 813         if (!mlxsw_core->pcpu_stats) {
 814                 err = -ENOMEM;
 815                 goto err_alloc_stats;
 816         }
 817
 818         err = mlxsw_bus->init(bus_priv, mlxsw_core, mlxsw_driver->profile);
 819         if (err)
 820                 goto err_bus_init;
 821
 822         err = mlxsw_emad_init(mlxsw_core);
 823         if (err)
 824                 goto err_emad_init;
 825
 826         err = mlxsw_driver->init(mlxsw_core->driver_priv, mlxsw_core,
 827                                  mlxsw_bus_info);
 828         if (err)
 829                 goto err_driver_init;
 830
 831         err = mlxsw_core_debugfs_init(mlxsw_core);
 832         if (err)
 833                 goto err_debugfs_init;
 834
 835         return 0;
 836
 837 err_debugfs_init:
 838         mlxsw_core->driver->fini(mlxsw_core->driver_priv);
 839 err_driver_init:
 840         mlxsw_emad_fini(mlxsw_core);
 841 err_emad_init:
 842         mlxsw_bus->fini(bus_priv);
 843 err_bus_init:
 844         free_percpu(mlxsw_core->pcpu_stats);
 845 err_alloc_stats:
 846         kfree(mlxsw_core);
 847 err_core_alloc:
 848         mlxsw_core_driver_put(device_kind);
 849         return err;
 850 }
 851 EXPORT_SYMBOL(mlxsw_core_bus_device_register);
 852
 853 void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core)
 854 {
 855         const char *device_kind = mlxsw_core->bus_info->device_kind;
 856
 857         mlxsw_core_debugfs_fini(mlxsw_core);
 858         mlxsw_core->driver->fini(mlxsw_core->driver_priv);
 859         mlxsw_emad_fini(mlxsw_core);
 860         mlxsw_core->bus->fini(mlxsw_core->bus_priv);
 861         free_percpu(mlxsw_core->pcpu_stats);
 862         kfree(mlxsw_core);
 863         mlxsw_core_driver_put(device_kind);
 864 }
 865 EXPORT_SYMBOL(mlxsw_core_bus_device_unregister);
 866
 867 static struct mlxsw_core *__mlxsw_core_get(void *driver_priv)
 868 {
 869         return container_of(driver_priv, struct mlxsw_core, driver_priv);
 870 }
 871
 872 bool mlxsw_core_skb_transmit_busy(void *driver_priv,
 873                                   const struct mlxsw_tx_info *tx_info)
 874 {
 875         struct mlxsw_core *mlxsw_core = __mlxsw_core_get(driver_priv);
 876
 877         return mlxsw_core->bus->skb_transmit_busy(mlxsw_core->bus_priv,
 878                                                   tx_info);
 879 }
 880 EXPORT_SYMBOL(mlxsw_core_skb_transmit_busy);
 881
 882 int mlxsw_core_skb_transmit(void *driver_priv, struct sk_buff *skb,
 883                             const struct mlxsw_tx_info *tx_info)
 884 {
 885         struct mlxsw_core *mlxsw_core = __mlxsw_core_get(driver_priv);
 886
 887         return mlxsw_core->bus->skb_transmit(mlxsw_core->bus_priv, skb,
 888                                              tx_info);
 889 }
 890 EXPORT_SYMBOL(mlxsw_core_skb_transmit);
 891
 892 static bool __is_rx_listener_equal(const struct mlxsw_rx_listener *rxl_a,
 893                                    const struct mlxsw_rx_listener *rxl_b)
 894 {
 895         return (rxl_a->func == rxl_b->func &&
 896                 rxl_a->local_port == rxl_b->local_port &&
 897                 rxl_a->trap_id == rxl_b->trap_id);
 898 }
 899
 900 static struct mlxsw_rx_listener_item *
 901 __find_rx_listener_item(struct mlxsw_core *mlxsw_core,
 902                         const struct mlxsw_rx_listener *rxl,
 903                         void *priv)
 904 {
 905         struct mlxsw_rx_listener_item *rxl_item;
 906
 907         list_for_each_entry(rxl_item, &mlxsw_core->rx_listener_list, list) {
 908                 if (__is_rx_listener_equal(&rxl_item->rxl, rxl) &&
 909                     rxl_item->priv == priv)
 910                         return rxl_item;
 911         }
 912         return NULL;
 913 }
 914
 915 int mlxsw_core_rx_listener_register(struct mlxsw_core *mlxsw_core,
 916                                     const struct mlxsw_rx_listener *rxl,
 917                                     void *priv)
 918 {
 919         struct mlxsw_rx_listener_item *rxl_item;
 920
 921         rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv);
 922         if (rxl_item)
 923                 return -EEXIST;
 924         rxl_item = kmalloc(sizeof(*rxl_item), GFP_KERNEL);
 925         if (!rxl_item)
 926                 return -ENOMEM;
 927         rxl_item->rxl = *rxl;
 928         rxl_item->priv = priv;
 929
 930         list_add_rcu(&rxl_item->list, &mlxsw_core->rx_listener_list);
 931         return 0;
 932 }
 933 EXPORT_SYMBOL(mlxsw_core_rx_listener_register);
 934
 935 void mlxsw_core_rx_listener_unregister(struct mlxsw_core *mlxsw_core,
 936                                        const struct mlxsw_rx_listener *rxl,
 937                                        void *priv)
 938 {
 939         struct mlxsw_rx_listener_item *rxl_item;
 940
 941         rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv);
 942         if (!rxl_item)
 943                 return;
 944         list_del_rcu(&rxl_item->list);
 945         synchronize_rcu();
 946         kfree(rxl_item);
 947 }
 948 EXPORT_SYMBOL(mlxsw_core_rx_listener_unregister);
 949
 950 static void mlxsw_core_event_listener_func(struct sk_buff *skb, u8 local_port,
 951                                            void *priv)
 952 {
 953         struct mlxsw_event_listener_item *event_listener_item = priv;
 954         struct mlxsw_reg_info reg;
 955         char *payload;
 956         char *op_tlv = mlxsw_emad_op_tlv(skb);
 957         char *reg_tlv = mlxsw_emad_reg_tlv(skb);
 958
 959         reg.id = mlxsw_emad_op_tlv_register_id_get(op_tlv);
 960         reg.len = (mlxsw_emad_reg_tlv_len_get(reg_tlv) - 1) * sizeof(u32);
 961         payload = mlxsw_emad_reg_payload(op_tlv);
 962         event_listener_item->el.func(&reg, payload, event_listener_item->priv);
 963         dev_kfree_skb(skb);
 964 }
 965
 966 static bool __is_event_listener_equal(const struct mlxsw_event_listener *el_a,
 967                                       const struct mlxsw_event_listener *el_b)
 968 {
 969         return (el_a->func == el_b->func &&
 970                 el_a->trap_id == el_b->trap_id);
 971 }
 972
 973 static struct mlxsw_event_listener_item *
 974 __find_event_listener_item(struct mlxsw_core *mlxsw_core,
 975                            const struct mlxsw_event_listener *el,
 976                            void *priv)
 977 {
 978         struct mlxsw_event_listener_item *el_item;
 979
 980         list_for_each_entry(el_item, &mlxsw_core->event_listener_list, list) {
 981                 if (__is_event_listener_equal(&el_item->el, el) &&
 982                     el_item->priv == priv)
 983                         return el_item;
 984         }
 985         return NULL;
 986 }
 987
 988 int mlxsw_core_event_listener_register(struct mlxsw_core *mlxsw_core,
 989                                        const struct mlxsw_event_listener *el,
 990                                        void *priv)
 991 {
 992         int err;
 993         struct mlxsw_event_listener_item *el_item;
 994         const struct mlxsw_rx_listener rxl = {
 995                 .func = mlxsw_core_event_listener_func,
 996                 .local_port = MLXSW_PORT_DONT_CARE,
 997                 .trap_id = el->trap_id,
 998         };
 999
1000         el_item = __find_event_listener_item(mlxsw_core, el, priv);
1001         if (el_item)
1002                 return -EEXIST;
1003         el_item = kmalloc(sizeof(*el_item), GFP_KERNEL);
1004         if (!el_item)
1005                 return -ENOMEM;
1006         el_item->el = *el;
1007         el_item->priv = priv;
1008
1009         err = mlxsw_core_rx_listener_register(mlxsw_core, &rxl, el_item);
1010         if (err)
1011                 goto err_rx_listener_register;
1012
1013         /* No reason to save item if we did not manage to register an RX
1014          * listener for it.
1015          */
1016         list_add_rcu(&el_item->list, &mlxsw_core->event_listener_list);
1017
1018         return 0;
1019
1020 err_rx_listener_register:
1021         kfree(el_item);
1022         return err;
1023 }
1024 EXPORT_SYMBOL(mlxsw_core_event_listener_register);
1025
1026 void mlxsw_core_event_listener_unregister(struct mlxsw_core *mlxsw_core,
1027                                           const struct mlxsw_event_listener *el,
1028                                           void *priv)
1029 {
1030         struct mlxsw_event_listener_item *el_item;
1031         const struct mlxsw_rx_listener rxl = {
1032                 .func = mlxsw_core_event_listener_func,
1033                 .local_port = MLXSW_PORT_DONT_CARE,
1034                 .trap_id = el->trap_id,
1035         };
1036
1037         el_item = __find_event_listener_item(mlxsw_core, el, priv);
1038         if (!el_item)
1039                 return;
1040         mlxsw_core_rx_listener_unregister(mlxsw_core, &rxl, el_item);
1041         list_del(&el_item->list);
1042         kfree(el_item);
1043 }
1044 EXPORT_SYMBOL(mlxsw_core_event_listener_unregister);
1045
1046 static int mlxsw_core_reg_access_emad(struct mlxsw_core *mlxsw_core,
1047                                       const struct mlxsw_reg_info *reg,
1048                                       char *payload,
1049                                       enum mlxsw_core_reg_access_type type)
1050 {
1051         int err;
1052         char *op_tlv;
1053         struct sk_buff *skb;
1054         struct mlxsw_tx_info tx_info = {
1055                 .local_port = MLXSW_PORT_CPU_PORT,
1056                 .is_emad = true,
1057         };
1058
1059         skb = mlxsw_emad_alloc(mlxsw_core, reg->len);
1060         if (!skb)
1061                 return -ENOMEM;
1062
1063         mlxsw_emad_construct(skb, reg, payload, type, mlxsw_core);
1064         mlxsw_core->driver->txhdr_construct(skb, &tx_info);
1065
1066         dev_dbg(mlxsw_core->bus_info->dev, "EMAD send (tid=%llx)\n",
1067                 mlxsw_core->emad.tid);
1068         mlxsw_core_buf_dump_dbg(mlxsw_core, skb->data, skb->len);
1069
1070         err = mlxsw_emad_transmit(mlxsw_core, skb, &tx_info);
1071         if (!err) {
1072                 op_tlv = mlxsw_emad_op_tlv(mlxsw_core->emad.resp_skb);
1073                 memcpy(payload, mlxsw_emad_reg_payload(op_tlv),
1074                        reg->len);
1075
1076                 dev_dbg(mlxsw_core->bus_info->dev, "EMAD recv (tid=%llx)\n",
1077                         mlxsw_core->emad.tid - 1);
1078                 mlxsw_core_buf_dump_dbg(mlxsw_core,
1079                                         mlxsw_core->emad.resp_skb->data,
1080                                         mlxsw_core->emad.resp_skb->len);
1081
1082                 dev_kfree_skb(mlxsw_core->emad.resp_skb);
1083         }
1084
1085         return err;
1086 }
1087
1088 static int mlxsw_core_reg_access_cmd(struct mlxsw_core *mlxsw_core,
1089                                      const struct mlxsw_reg_info *reg,
1090                                      char *payload,
1091                                      enum mlxsw_core_reg_access_type type)
1092 {
1093         int err, n_retry;
1094         char *in_mbox, *out_mbox, *tmp;
1095
1096         in_mbox = mlxsw_cmd_mbox_alloc();
1097         if (!in_mbox)
1098                 return -ENOMEM;
1099
1100         out_mbox = mlxsw_cmd_mbox_alloc();
1101         if (!out_mbox) {
1102                 err = -ENOMEM;
1103                 goto free_in_mbox;
1104         }
1105
1106         mlxsw_emad_pack_op_tlv(in_mbox, reg, type, mlxsw_core);
1107         tmp = in_mbox + MLXSW_EMAD_OP_TLV_LEN * sizeof(u32);
1108         mlxsw_emad_pack_reg_tlv(tmp, reg, payload);
1109
1110         n_retry = 0;
1111 retry:
1112         err = mlxsw_cmd_access_reg(mlxsw_core, in_mbox, out_mbox);
1113         if (!err) {
1114                 err = mlxsw_emad_process_status(mlxsw_core, out_mbox);
1115                 if (err == -EAGAIN && n_retry++ < MLXSW_EMAD_MAX_RETRY)
1116                         goto retry;
1117         }
1118
1119         if (!err)
1120                 memcpy(payload, mlxsw_emad_reg_payload(out_mbox),
1121                        reg->len);
1122
1123         mlxsw_core->emad.tid++;
1124         mlxsw_cmd_mbox_free(out_mbox);
1125 free_in_mbox:
1126         mlxsw_cmd_mbox_free(in_mbox);
1127         return err;
1128 }
1129
1130 static int mlxsw_core_reg_access(struct mlxsw_core *mlxsw_core,
1131                                  const struct mlxsw_reg_info *reg,
1132                                  char *payload,
1133                                  enum mlxsw_core_reg_access_type type)
1134 {
1135         u64 cur_tid;
1136         int err;
1137
1138         if (mutex_lock_interruptible(&mlxsw_core->emad.lock)) {
1139                 dev_err(mlxsw_core->bus_info->dev, "Reg access interrupted (reg_id=%x(%s),type=%s)\n",
1140                         reg->id, mlxsw_reg_id_str(reg->id),
1141                         mlxsw_core_reg_access_type_str(type));
1142                 return -EINTR;
1143         }
1144
1145         cur_tid = mlxsw_core->emad.tid;
1146         dev_dbg(mlxsw_core->bus_info->dev, "Reg access (tid=%llx,reg_id=%x(%s),type=%s)\n",
1147                 cur_tid, reg->id, mlxsw_reg_id_str(reg->id),
1148                 mlxsw_core_reg_access_type_str(type));
1149
1150         /* During initialization EMAD interface is not available to us,
1151          * so we default to command interface. We switch to EMAD interface
1152          * after setting the appropriate traps.
1153          */
1154         if (!mlxsw_core->emad.use_emad)
1155                 err = mlxsw_core_reg_access_cmd(mlxsw_core, reg,
1156                                                 payload, type);
1157         else
1158                 err = mlxsw_core_reg_access_emad(mlxsw_core, reg,
1159                                                  payload, type);
1160
1161         if (err)
1162                 dev_err(mlxsw_core->bus_info->dev, "Reg access failed (tid=%llx,reg_id=%x(%s),type=%s)\n",
1163                         cur_tid, reg->id, mlxsw_reg_id_str(reg->id),
1164                         mlxsw_core_reg_access_type_str(type));
1165
1166         mutex_unlock(&mlxsw_core->emad.lock);
1167         return err;
1168 }
1169
1170 int mlxsw_reg_query(struct mlxsw_core *mlxsw_core,
1171                     const struct mlxsw_reg_info *reg, char *payload)
1172 {
1173         return mlxsw_core_reg_access(mlxsw_core, reg, payload,
1174                                      MLXSW_CORE_REG_ACCESS_TYPE_QUERY);
1175 }
1176 EXPORT_SYMBOL(mlxsw_reg_query);
1177
1178 int mlxsw_reg_write(struct mlxsw_core *mlxsw_core,
1179                     const struct mlxsw_reg_info *reg, char *payload)
1180 {
1181         return mlxsw_core_reg_access(mlxsw_core, reg, payload,
1182                                      MLXSW_CORE_REG_ACCESS_TYPE_WRITE);
1183 }
1184 EXPORT_SYMBOL(mlxsw_reg_write);
1185
1186 void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
1187                             struct mlxsw_rx_info *rx_info)
1188 {
1189         struct mlxsw_rx_listener_item *rxl_item;
1190         const struct mlxsw_rx_listener *rxl;
1191         struct mlxsw_core_pcpu_stats *pcpu_stats;
1192         u8 local_port = rx_info->sys_port;
1193         bool found = false;
1194
1195         dev_dbg_ratelimited(mlxsw_core->bus_info->dev, "%s: sys_port = %d, trap_id = 0x%x\n",
1196                             __func__, rx_info->sys_port, rx_info->trap_id);
1197
1198         if ((rx_info->trap_id >= MLXSW_TRAP_ID_MAX) ||
1199             (local_port >= MLXSW_PORT_MAX_PORTS))
1200                 goto drop;
1201
1202         rcu_read_lock();
1203         list_for_each_entry_rcu(rxl_item, &mlxsw_core->rx_listener_list, list) {
1204                 rxl = &rxl_item->rxl;
1205                 if ((rxl->local_port == MLXSW_PORT_DONT_CARE ||
1206                      rxl->local_port == local_port) &&
1207                     rxl->trap_id == rx_info->trap_id) {
1208                         found = true;
1209                         break;
1210                 }
1211         }
1212         rcu_read_unlock();
1213         if (!found)
1214                 goto drop;
1215
1216         pcpu_stats = this_cpu_ptr(mlxsw_core->pcpu_stats);
1217         u64_stats_update_begin(&pcpu_stats->syncp);
1218         pcpu_stats->port_rx_packets[local_port]++;
1219         pcpu_stats->port_rx_bytes[local_port] += skb->len;
1220         pcpu_stats->trap_rx_packets[rx_info->trap_id]++;
1221         pcpu_stats->trap_rx_bytes[rx_info->trap_id] += skb->len;
1222         u64_stats_update_end(&pcpu_stats->syncp);
1223
1224         rxl->func(skb, local_port, rxl_item->priv);
1225         return;
1226
1227 drop:
1228         if (rx_info->trap_id >= MLXSW_TRAP_ID_MAX)
1229                 this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_invalid);
1230         else
1231                 this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_dropped[rx_info->trap_id]);
1232         if (local_port >= MLXSW_PORT_MAX_PORTS)
1233                 this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_invalid);
1234         else
1235                 this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_dropped[local_port]);
1236         dev_kfree_skb(skb);
1237 }
1238 EXPORT_SYMBOL(mlxsw_core_skb_receive);
1239
1240 int mlxsw_cmd_exec(struct mlxsw_core *mlxsw_core, u16 opcode, u8 opcode_mod,
1241                    u32 in_mod, bool out_mbox_direct,
1242                    char *in_mbox, size_t in_mbox_size,
1243                    char *out_mbox, size_t out_mbox_size)
1244 {
1245         u8 status;
1246         int err;
1247
1248         BUG_ON(in_mbox_size % sizeof(u32) || out_mbox_size % sizeof(u32));
1249         if (!mlxsw_core->bus->cmd_exec)
1250                 return -EOPNOTSUPP;
1251
1252         dev_dbg(mlxsw_core->bus_info->dev, "Cmd exec (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n",
1253                 opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod, in_mod);
1254         if (in_mbox) {
1255                 dev_dbg(mlxsw_core->bus_info->dev, "Input mailbox:\n");
1256                 mlxsw_core_buf_dump_dbg(mlxsw_core, in_mbox, in_mbox_size);
1257         }
1258
1259         err = mlxsw_core->bus->cmd_exec(mlxsw_core->bus_priv, opcode,
1260                                         opcode_mod, in_mod, out_mbox_direct,
1261                                         in_mbox, in_mbox_size,
1262                                         out_mbox, out_mbox_size, &status);
1263
1264         if (err == -EIO && status != MLXSW_CMD_STATUS_OK) {
1265                 dev_err(mlxsw_core->bus_info->dev, "Cmd exec failed (opcode=%x(%s),opcode_mod=%x,in_mod=%x,status=%x(%s))\n",
1266                         opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod,
1267                         in_mod, status, mlxsw_cmd_status_str(status));
1268         } else if (err == -ETIMEDOUT) {
1269                 dev_err(mlxsw_core->bus_info->dev, "Cmd exec timed-out (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n",
1270                         opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod,
1271                         in_mod);
1272         }
1273
1274         if (!err && out_mbox) {
1275                 dev_dbg(mlxsw_core->bus_info->dev, "Output mailbox:\n");
1276                 mlxsw_core_buf_dump_dbg(mlxsw_core, out_mbox, out_mbox_size);
1277         }
1278         return err;
1279 }
1280 EXPORT_SYMBOL(mlxsw_cmd_exec);
1281
1282 static int __init mlxsw_core_module_init(void)
1283 {
1284         mlxsw_core_dbg_root = debugfs_create_dir(mlxsw_core_driver_name, NULL);
1285         if (!mlxsw_core_dbg_root)
1286                 return -ENOMEM;
1287         return 0;
1288 }
1289
1290 static void __exit mlxsw_core_module_exit(void)
1291 {
1292         debugfs_remove_recursive(mlxsw_core_dbg_root);
1293 }
1294
1295 module_init(mlxsw_core_module_init);
1296 module_exit(mlxsw_core_module_exit);
1297
1298 MODULE_LICENSE("Dual BSD/GPL");
1299 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
1300 MODULE_DESCRIPTION("Mellanox switch device core driver");