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