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