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

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