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