drivers/net/netdevsim/dev.c

   1 /*
   2  * Copyright (c) 2018 Cumulus Networks. All rights reserved.
   3  * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com>
   4  * Copyright (c) 2019 Mellanox Technologies. All rights reserved.
   5  *
   6  * This software is licensed under the GNU General License Version 2,
   7  * June 1991 as shown in the file COPYING in the top-level directory of this
   8  * source tree.
   9  *
  10  * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
  11  * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
  12  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  13  * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
  14  * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
  15  * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
  16  */
  17
  18 #include <linux/debugfs.h>
  19 #include <linux/device.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/inet.h>
  22 #include <linux/jiffies.h>
  23 #include <linux/kernel.h>
  24 #include <linux/list.h>
  25 #include <linux/mutex.h>
  26 #include <linux/random.h>
  27 #include <linux/rtnetlink.h>
  28 #include <linux/workqueue.h>
  29 #include <net/devlink.h>
  30 #include <net/ip.h>
  31 #include <uapi/linux/devlink.h>
  32 #include <uapi/linux/ip.h>
  33 #include <uapi/linux/udp.h>
  34
  35 #include "netdevsim.h"
  36
  37 static struct dentry *nsim_dev_ddir;
  38
  39 #define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)
  40
  41 static ssize_t nsim_dev_take_snapshot_write(struct file *file,
  42                                             const char __user *data,
  43                                             size_t count, loff_t *ppos)
  44 {
  45         struct nsim_dev *nsim_dev = file->private_data;
  46         void *dummy_data;
  47         int err;
  48         u32 id;
  49
  50         dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL);
  51         if (!dummy_data)
  52                 return -ENOMEM;
  53
  54         get_random_bytes(dummy_data, NSIM_DEV_DUMMY_REGION_SIZE);
  55
  56         id = devlink_region_shapshot_id_get(priv_to_devlink(nsim_dev));
  57         err = devlink_region_snapshot_create(nsim_dev->dummy_region,
  58                                              dummy_data, id, kfree);
  59         if (err) {
  60                 pr_err("Failed to create region snapshot\n");
  61                 kfree(dummy_data);
  62                 return err;
  63         }
  64
  65         return count;
  66 }
  67
  68 static const struct file_operations nsim_dev_take_snapshot_fops = {
  69         .open = simple_open,
  70         .write = nsim_dev_take_snapshot_write,
  71         .llseek = generic_file_llseek,
  72 };
  73
  74 static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
  75 {
  76         char dev_ddir_name[16];
  77
  78         sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id);
  79         nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir);
  80         if (IS_ERR_OR_NULL(nsim_dev->ddir))
  81                 return PTR_ERR_OR_ZERO(nsim_dev->ddir) ?: -EINVAL;
  82         nsim_dev->ports_ddir = debugfs_create_dir("ports", nsim_dev->ddir);
  83         if (IS_ERR_OR_NULL(nsim_dev->ports_ddir))
  84                 return PTR_ERR_OR_ZERO(nsim_dev->ports_ddir) ?: -EINVAL;
  85         debugfs_create_bool("fw_update_status", 0600, nsim_dev->ddir,
  86                             &nsim_dev->fw_update_status);
  87         debugfs_create_u32("max_macs", 0600, nsim_dev->ddir,
  88                            &nsim_dev->max_macs);
  89         debugfs_create_bool("test1", 0600, nsim_dev->ddir,
  90                             &nsim_dev->test1);
  91         debugfs_create_file("take_snapshot", 0200, nsim_dev->ddir, nsim_dev,
  92                             &nsim_dev_take_snapshot_fops);
  93         return 0;
  94 }
  95
  96 static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
  97 {
  98         debugfs_remove_recursive(nsim_dev->ports_ddir);
  99         debugfs_remove_recursive(nsim_dev->ddir);
 100 }
 101
 102 static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
 103                                       struct nsim_dev_port *nsim_dev_port)
 104 {
 105         char port_ddir_name[16];
 106         char dev_link_name[32];
 107
 108         sprintf(port_ddir_name, "%u", nsim_dev_port->port_index);
 109         nsim_dev_port->ddir = debugfs_create_dir(port_ddir_name,
 110                                                  nsim_dev->ports_ddir);
 111         if (IS_ERR_OR_NULL(nsim_dev_port->ddir))
 112                 return -ENOMEM;
 113
 114         sprintf(dev_link_name, "../../../" DRV_NAME "%u",
 115                 nsim_dev->nsim_bus_dev->dev.id);
 116         debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name);
 117
 118         return 0;
 119 }
 120
 121 static void nsim_dev_port_debugfs_exit(struct nsim_dev_port *nsim_dev_port)
 122 {
 123         debugfs_remove_recursive(nsim_dev_port->ddir);
 124 }
 125
 126 static struct net *nsim_devlink_net(struct devlink *devlink)
 127 {
 128         return &init_net;
 129 }
 130
 131 static u64 nsim_dev_ipv4_fib_resource_occ_get(void *priv)
 132 {
 133         struct net *net = priv;
 134
 135         return nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB, false);
 136 }
 137
 138 static u64 nsim_dev_ipv4_fib_rules_res_occ_get(void *priv)
 139 {
 140         struct net *net = priv;
 141
 142         return nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB_RULES, false);
 143 }
 144
 145 static u64 nsim_dev_ipv6_fib_resource_occ_get(void *priv)
 146 {
 147         struct net *net = priv;
 148
 149         return nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB, false);
 150 }
 151
 152 static u64 nsim_dev_ipv6_fib_rules_res_occ_get(void *priv)
 153 {
 154         struct net *net = priv;
 155
 156         return nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB_RULES, false);
 157 }
 158
 159 static int nsim_dev_resources_register(struct devlink *devlink)
 160 {
 161         struct devlink_resource_size_params params = {
 162                 .size_max = (u64)-1,
 163                 .size_granularity = 1,
 164                 .unit = DEVLINK_RESOURCE_UNIT_ENTRY
 165         };
 166         struct net *net = nsim_devlink_net(devlink);
 167         int err;
 168         u64 n;
 169
 170         /* Resources for IPv4 */
 171         err = devlink_resource_register(devlink, "IPv4", (u64)-1,
 172                                         NSIM_RESOURCE_IPV4,
 173                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 174                                         &params);
 175         if (err) {
 176                 pr_err("Failed to register IPv4 top resource\n");
 177                 goto out;
 178         }
 179
 180         n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB, true);
 181         err = devlink_resource_register(devlink, "fib", n,
 182                                         NSIM_RESOURCE_IPV4_FIB,
 183                                         NSIM_RESOURCE_IPV4, &params);
 184         if (err) {
 185                 pr_err("Failed to register IPv4 FIB resource\n");
 186                 return err;
 187         }
 188
 189         n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB_RULES, true);
 190         err = devlink_resource_register(devlink, "fib-rules", n,
 191                                         NSIM_RESOURCE_IPV4_FIB_RULES,
 192                                         NSIM_RESOURCE_IPV4, &params);
 193         if (err) {
 194                 pr_err("Failed to register IPv4 FIB rules resource\n");
 195                 return err;
 196         }
 197
 198         /* Resources for IPv6 */
 199         err = devlink_resource_register(devlink, "IPv6", (u64)-1,
 200                                         NSIM_RESOURCE_IPV6,
 201                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 202                                         &params);
 203         if (err) {
 204                 pr_err("Failed to register IPv6 top resource\n");
 205                 goto out;
 206         }
 207
 208         n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB, true);
 209         err = devlink_resource_register(devlink, "fib", n,
 210                                         NSIM_RESOURCE_IPV6_FIB,
 211                                         NSIM_RESOURCE_IPV6, &params);
 212         if (err) {
 213                 pr_err("Failed to register IPv6 FIB resource\n");
 214                 return err;
 215         }
 216
 217         n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB_RULES, true);
 218         err = devlink_resource_register(devlink, "fib-rules", n,
 219                                         NSIM_RESOURCE_IPV6_FIB_RULES,
 220                                         NSIM_RESOURCE_IPV6, &params);
 221         if (err) {
 222                 pr_err("Failed to register IPv6 FIB rules resource\n");
 223                 return err;
 224         }
 225
 226         devlink_resource_occ_get_register(devlink,
 227                                           NSIM_RESOURCE_IPV4_FIB,
 228                                           nsim_dev_ipv4_fib_resource_occ_get,
 229                                           net);
 230         devlink_resource_occ_get_register(devlink,
 231                                           NSIM_RESOURCE_IPV4_FIB_RULES,
 232                                           nsim_dev_ipv4_fib_rules_res_occ_get,
 233                                           net);
 234         devlink_resource_occ_get_register(devlink,
 235                                           NSIM_RESOURCE_IPV6_FIB,
 236                                           nsim_dev_ipv6_fib_resource_occ_get,
 237                                           net);
 238         devlink_resource_occ_get_register(devlink,
 239                                           NSIM_RESOURCE_IPV6_FIB_RULES,
 240                                           nsim_dev_ipv6_fib_rules_res_occ_get,
 241                                           net);
 242 out:
 243         return err;
 244 }
 245
 246 enum nsim_devlink_param_id {
 247         NSIM_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
 248         NSIM_DEVLINK_PARAM_ID_TEST1,
 249 };
 250
 251 static const struct devlink_param nsim_devlink_params[] = {
 252         DEVLINK_PARAM_GENERIC(MAX_MACS,
 253                               BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 254                               NULL, NULL, NULL),
 255         DEVLINK_PARAM_DRIVER(NSIM_DEVLINK_PARAM_ID_TEST1,
 256                              "test1", DEVLINK_PARAM_TYPE_BOOL,
 257                              BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 258                              NULL, NULL, NULL),
 259 };
 260
 261 static void nsim_devlink_set_params_init_values(struct nsim_dev *nsim_dev,
 262                                                 struct devlink *devlink)
 263 {
 264         union devlink_param_value value;
 265
 266         value.vu32 = nsim_dev->max_macs;
 267         devlink_param_driverinit_value_set(devlink,
 268                                            DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
 269                                            value);
 270         value.vbool = nsim_dev->test1;
 271         devlink_param_driverinit_value_set(devlink,
 272                                            NSIM_DEVLINK_PARAM_ID_TEST1,
 273                                            value);
 274 }
 275
 276 static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink)
 277 {
 278         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 279         union devlink_param_value saved_value;
 280         int err;
 281
 282         err = devlink_param_driverinit_value_get(devlink,
 283                                                  DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
 284                                                  &saved_value);
 285         if (!err)
 286                 nsim_dev->max_macs = saved_value.vu32;
 287         err = devlink_param_driverinit_value_get(devlink,
 288                                                  NSIM_DEVLINK_PARAM_ID_TEST1,
 289                                                  &saved_value);
 290         if (!err)
 291                 nsim_dev->test1 = saved_value.vbool;
 292 }
 293
 294 #define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16
 295
 296 static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,
 297                                       struct devlink *devlink)
 298 {
 299         nsim_dev->dummy_region =
 300                 devlink_region_create(devlink, "dummy",
 301                                       NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX,
 302                                       NSIM_DEV_DUMMY_REGION_SIZE);
 303         return PTR_ERR_OR_ZERO(nsim_dev->dummy_region);
 304 }
 305
 306 static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev)
 307 {
 308         devlink_region_destroy(nsim_dev->dummy_region);
 309 }
 310
 311 struct nsim_trap_item {
 312         void *trap_ctx;
 313         enum devlink_trap_action action;
 314 };
 315
 316 struct nsim_trap_data {
 317         struct delayed_work trap_report_dw;
 318         struct nsim_trap_item *trap_items_arr;
 319         struct nsim_dev *nsim_dev;
 320         spinlock_t trap_lock;   /* Protects trap_items_arr */
 321 };
 322
 323 /* All driver-specific traps must be documented in
 324  * Documentation/networking/devlink-trap-netdevsim.rst
 325  */
 326 enum {
 327         NSIM_TRAP_ID_BASE = DEVLINK_TRAP_GENERIC_ID_MAX,
 328         NSIM_TRAP_ID_FID_MISS,
 329 };
 330
 331 #define NSIM_TRAP_NAME_FID_MISS "fid_miss"
 332
 333 #define NSIM_TRAP_METADATA DEVLINK_TRAP_METADATA_TYPE_F_IN_PORT
 334
 335 #define NSIM_TRAP_DROP(_id, _group_id)                                        \
 336         DEVLINK_TRAP_GENERIC(DROP, DROP, _id,                                 \
 337                              DEVLINK_TRAP_GROUP_GENERIC(_group_id),           \
 338                              NSIM_TRAP_METADATA)
 339 #define NSIM_TRAP_EXCEPTION(_id, _group_id)                                   \
 340         DEVLINK_TRAP_GENERIC(EXCEPTION, TRAP, _id,                            \
 341                              DEVLINK_TRAP_GROUP_GENERIC(_group_id),           \
 342                              NSIM_TRAP_METADATA)
 343 #define NSIM_TRAP_DRIVER_EXCEPTION(_id, _group_id)                            \
 344         DEVLINK_TRAP_DRIVER(EXCEPTION, TRAP, NSIM_TRAP_ID_##_id,              \
 345                             NSIM_TRAP_NAME_##_id,                             \
 346                             DEVLINK_TRAP_GROUP_GENERIC(_group_id),            \
 347                             NSIM_TRAP_METADATA)
 348
 349 static const struct devlink_trap nsim_traps_arr[] = {
 350         NSIM_TRAP_DROP(SMAC_MC, L2_DROPS),
 351         NSIM_TRAP_DROP(VLAN_TAG_MISMATCH, L2_DROPS),
 352         NSIM_TRAP_DROP(INGRESS_VLAN_FILTER, L2_DROPS),
 353         NSIM_TRAP_DROP(INGRESS_STP_FILTER, L2_DROPS),
 354         NSIM_TRAP_DROP(EMPTY_TX_LIST, L2_DROPS),
 355         NSIM_TRAP_DROP(PORT_LOOPBACK_FILTER, L2_DROPS),
 356         NSIM_TRAP_DRIVER_EXCEPTION(FID_MISS, L2_DROPS),
 357         NSIM_TRAP_DROP(BLACKHOLE_ROUTE, L3_DROPS),
 358         NSIM_TRAP_EXCEPTION(TTL_ERROR, L3_DROPS),
 359         NSIM_TRAP_DROP(TAIL_DROP, BUFFER_DROPS),
 360 };
 361
 362 #define NSIM_TRAP_L4_DATA_LEN 100
 363
 364 static struct sk_buff *nsim_dev_trap_skb_build(void)
 365 {
 366         int tot_len, data_len = NSIM_TRAP_L4_DATA_LEN;
 367         struct sk_buff *skb;
 368         struct udphdr *udph;
 369         struct ethhdr *eth;
 370         struct iphdr *iph;
 371
 372         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 373         if (!skb)
 374                 return NULL;
 375         tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + data_len;
 376
 377         eth = skb_put(skb, sizeof(struct ethhdr));
 378         eth_random_addr(eth->h_dest);
 379         eth_random_addr(eth->h_source);
 380         eth->h_proto = htons(ETH_P_IP);
 381         skb->protocol = htons(ETH_P_IP);
 382
 383         iph = skb_put(skb, sizeof(struct iphdr));
 384         iph->protocol = IPPROTO_UDP;
 385         iph->saddr = in_aton("192.0.2.1");
 386         iph->daddr = in_aton("198.51.100.1");
 387         iph->version = 0x4;
 388         iph->frag_off = 0;
 389         iph->ihl = 0x5;
 390         iph->tot_len = htons(tot_len);
 391         iph->ttl = 100;
 392         ip_send_check(iph);
 393
 394         udph = skb_put_zero(skb, sizeof(struct udphdr) + data_len);
 395         get_random_bytes(&udph->source, sizeof(u16));
 396         get_random_bytes(&udph->dest, sizeof(u16));
 397         udph->len = htons(sizeof(struct udphdr) + data_len);
 398
 399         return skb;
 400 }
 401
 402 static void nsim_dev_trap_report(struct nsim_dev_port *nsim_dev_port)
 403 {
 404         struct nsim_dev *nsim_dev = nsim_dev_port->ns->nsim_dev;
 405         struct devlink *devlink = priv_to_devlink(nsim_dev);
 406         struct nsim_trap_data *nsim_trap_data;
 407         int i;
 408
 409         nsim_trap_data = nsim_dev->trap_data;
 410
 411         spin_lock(&nsim_trap_data->trap_lock);
 412         for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
 413                 struct nsim_trap_item *nsim_trap_item;
 414                 struct sk_buff *skb;
 415
 416                 nsim_trap_item = &nsim_trap_data->trap_items_arr[i];
 417                 if (nsim_trap_item->action == DEVLINK_TRAP_ACTION_DROP)
 418                         continue;
 419
 420                 skb = nsim_dev_trap_skb_build();
 421                 if (!skb)
 422                         continue;
 423                 skb->dev = nsim_dev_port->ns->netdev;
 424
 425                 /* Trapped packets are usually passed to devlink in softIRQ,
 426                  * but in this case they are generated in a workqueue. Disable
 427                  * softIRQs to prevent lockdep from complaining about
 428                  * "incosistent lock state".
 429                  */
 430                 local_bh_disable();
 431                 devlink_trap_report(devlink, skb, nsim_trap_item->trap_ctx,
 432                                     &nsim_dev_port->devlink_port);
 433                 local_bh_enable();
 434                 consume_skb(skb);
 435         }
 436         spin_unlock(&nsim_trap_data->trap_lock);
 437 }
 438
 439 #define NSIM_TRAP_REPORT_INTERVAL_MS    100
 440
 441 static void nsim_dev_trap_report_work(struct work_struct *work)
 442 {
 443         struct nsim_trap_data *nsim_trap_data;
 444         struct nsim_dev_port *nsim_dev_port;
 445         struct nsim_dev *nsim_dev;
 446
 447         nsim_trap_data = container_of(work, struct nsim_trap_data,
 448                                       trap_report_dw.work);
 449         nsim_dev = nsim_trap_data->nsim_dev;
 450
 451         /* For each running port and enabled packet trap, generate a UDP
 452          * packet with a random 5-tuple and report it.
 453          */
 454         mutex_lock(&nsim_dev->port_list_lock);
 455         list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list) {
 456                 if (!netif_running(nsim_dev_port->ns->netdev))
 457                         continue;
 458
 459                 nsim_dev_trap_report(nsim_dev_port);
 460         }
 461         mutex_unlock(&nsim_dev->port_list_lock);
 462
 463         schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
 464                               msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));
 465 }
 466
 467 static int nsim_dev_traps_init(struct devlink *devlink)
 468 {
 469         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 470         struct nsim_trap_data *nsim_trap_data;
 471         int err;
 472
 473         nsim_trap_data = kzalloc(sizeof(*nsim_trap_data), GFP_KERNEL);
 474         if (!nsim_trap_data)
 475                 return -ENOMEM;
 476
 477         nsim_trap_data->trap_items_arr = kcalloc(ARRAY_SIZE(nsim_traps_arr),
 478                                                  sizeof(struct nsim_trap_item),
 479                                                  GFP_KERNEL);
 480         if (!nsim_trap_data->trap_items_arr) {
 481                 err = -ENOMEM;
 482                 goto err_trap_data_free;
 483         }
 484
 485         /* The lock is used to protect the action state of the registered
 486          * traps. The value is written by user and read in delayed work when
 487          * iterating over all the traps.
 488          */
 489         spin_lock_init(&nsim_trap_data->trap_lock);
 490         nsim_trap_data->nsim_dev = nsim_dev;
 491         nsim_dev->trap_data = nsim_trap_data;
 492
 493         err = devlink_traps_register(devlink, nsim_traps_arr,
 494                                      ARRAY_SIZE(nsim_traps_arr), NULL);
 495         if (err)
 496                 goto err_trap_items_free;
 497
 498         INIT_DELAYED_WORK(&nsim_dev->trap_data->trap_report_dw,
 499                           nsim_dev_trap_report_work);
 500         schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
 501                               msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));
 502
 503         return 0;
 504
 505 err_trap_items_free:
 506         kfree(nsim_trap_data->trap_items_arr);
 507 err_trap_data_free:
 508         kfree(nsim_trap_data);
 509         return err;
 510 }
 511
 512 static void nsim_dev_traps_exit(struct devlink *devlink)
 513 {
 514         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 515
 516         cancel_delayed_work_sync(&nsim_dev->trap_data->trap_report_dw);
 517         devlink_traps_unregister(devlink, nsim_traps_arr,
 518                                  ARRAY_SIZE(nsim_traps_arr));
 519         kfree(nsim_dev->trap_data->trap_items_arr);
 520         kfree(nsim_dev->trap_data);
 521 }
 522
 523 static int nsim_dev_reload(struct devlink *devlink,
 524                            struct netlink_ext_ack *extack)
 525 {
 526         enum nsim_resource_id res_ids[] = {
 527                 NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
 528                 NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
 529         };
 530         struct net *net = nsim_devlink_net(devlink);
 531         int i;
 532
 533         for (i = 0; i < ARRAY_SIZE(res_ids); ++i) {
 534                 int err;
 535                 u64 val;
 536
 537                 err = devlink_resource_size_get(devlink, res_ids[i], &val);
 538                 if (!err) {
 539                         err = nsim_fib_set_max(net, res_ids[i], val, extack);
 540                         if (err)
 541                                 return err;
 542                 }
 543         }
 544         nsim_devlink_param_load_driverinit_values(devlink);
 545
 546         return 0;
 547 }
 548
 549 #define NSIM_DEV_FLASH_SIZE 500000
 550 #define NSIM_DEV_FLASH_CHUNK_SIZE 1000
 551 #define NSIM_DEV_FLASH_CHUNK_TIME_MS 10
 552
 553 static int nsim_dev_flash_update(struct devlink *devlink, const char *file_name,
 554                                  const char *component,
 555                                  struct netlink_ext_ack *extack)
 556 {
 557         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 558         int i;
 559
 560         if (nsim_dev->fw_update_status) {
 561                 devlink_flash_update_begin_notify(devlink);
 562                 devlink_flash_update_status_notify(devlink,
 563                                                    "Preparing to flash",
 564                                                    component, 0, 0);
 565         }
 566
 567         for (i = 0; i < NSIM_DEV_FLASH_SIZE / NSIM_DEV_FLASH_CHUNK_SIZE; i++) {
 568                 if (nsim_dev->fw_update_status)
 569                         devlink_flash_update_status_notify(devlink, "Flashing",
 570                                                            component,
 571                                                            i * NSIM_DEV_FLASH_CHUNK_SIZE,
 572                                                            NSIM_DEV_FLASH_SIZE);
 573                 msleep(NSIM_DEV_FLASH_CHUNK_TIME_MS);
 574         }
 575
 576         if (nsim_dev->fw_update_status) {
 577                 devlink_flash_update_status_notify(devlink, "Flashing",
 578                                                    component,
 579                                                    NSIM_DEV_FLASH_SIZE,
 580                                                    NSIM_DEV_FLASH_SIZE);
 581                 devlink_flash_update_status_notify(devlink, "Flashing done",
 582                                                    component, 0, 0);
 583                 devlink_flash_update_end_notify(devlink);
 584         }
 585
 586         return 0;
 587 }
 588
 589 static struct nsim_trap_item *
 590 nsim_dev_trap_item_lookup(struct nsim_dev *nsim_dev, u16 trap_id)
 591 {
 592         struct nsim_trap_data *nsim_trap_data = nsim_dev->trap_data;
 593         int i;
 594
 595         for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
 596                 if (nsim_traps_arr[i].id == trap_id)
 597                         return &nsim_trap_data->trap_items_arr[i];
 598         }
 599
 600         return NULL;
 601 }
 602
 603 static int nsim_dev_devlink_trap_init(struct devlink *devlink,
 604                                       const struct devlink_trap *trap,
 605                                       void *trap_ctx)
 606 {
 607         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 608         struct nsim_trap_item *nsim_trap_item;
 609
 610         nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
 611         if (WARN_ON(!nsim_trap_item))
 612                 return -ENOENT;
 613
 614         nsim_trap_item->trap_ctx = trap_ctx;
 615         nsim_trap_item->action = trap->init_action;
 616
 617         return 0;
 618 }
 619
 620 static int
 621 nsim_dev_devlink_trap_action_set(struct devlink *devlink,
 622                                  const struct devlink_trap *trap,
 623                                  enum devlink_trap_action action)
 624 {
 625         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 626         struct nsim_trap_item *nsim_trap_item;
 627
 628         nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
 629         if (WARN_ON(!nsim_trap_item))
 630                 return -ENOENT;
 631
 632         spin_lock(&nsim_dev->trap_data->trap_lock);
 633         nsim_trap_item->action = action;
 634         spin_unlock(&nsim_dev->trap_data->trap_lock);
 635
 636         return 0;
 637 }
 638
 639 static const struct devlink_ops nsim_dev_devlink_ops = {
 640         .reload = nsim_dev_reload,
 641         .flash_update = nsim_dev_flash_update,
 642         .trap_init = nsim_dev_devlink_trap_init,
 643         .trap_action_set = nsim_dev_devlink_trap_action_set,
 644 };
 645
 646 #define NSIM_DEV_MAX_MACS_DEFAULT 32
 647 #define NSIM_DEV_TEST1_DEFAULT true
 648
 649 static struct nsim_dev *
 650 nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev, unsigned int port_count)
 651 {
 652         struct nsim_dev *nsim_dev;
 653         struct devlink *devlink;
 654         int err;
 655
 656         devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
 657         if (!devlink)
 658                 return ERR_PTR(-ENOMEM);
 659         nsim_dev = devlink_priv(devlink);
 660         nsim_dev->nsim_bus_dev = nsim_bus_dev;
 661         nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
 662         get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
 663         INIT_LIST_HEAD(&nsim_dev->port_list);
 664         mutex_init(&nsim_dev->port_list_lock);
 665         nsim_dev->fw_update_status = true;
 666         nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
 667         nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT;
 668
 669         err = nsim_dev_resources_register(devlink);
 670         if (err)
 671                 goto err_devlink_free;
 672
 673         err = devlink_register(devlink, &nsim_bus_dev->dev);
 674         if (err)
 675                 goto err_resources_unregister;
 676
 677         err = devlink_params_register(devlink, nsim_devlink_params,
 678                                       ARRAY_SIZE(nsim_devlink_params));
 679         if (err)
 680                 goto err_dl_unregister;
 681         nsim_devlink_set_params_init_values(nsim_dev, devlink);
 682
 683         err = nsim_dev_dummy_region_init(nsim_dev, devlink);
 684         if (err)
 685                 goto err_params_unregister;
 686
 687         err = nsim_dev_traps_init(devlink);
 688         if (err)
 689                 goto err_dummy_region_exit;
 690
 691         err = nsim_dev_debugfs_init(nsim_dev);
 692         if (err)
 693                 goto err_traps_exit;
 694
 695         err = nsim_bpf_dev_init(nsim_dev);
 696         if (err)
 697                 goto err_debugfs_exit;
 698
 699         devlink_params_publish(devlink);
 700         return nsim_dev;
 701
 702 err_debugfs_exit:
 703         nsim_dev_debugfs_exit(nsim_dev);
 704 err_traps_exit:
 705         nsim_dev_traps_exit(devlink);
 706 err_dummy_region_exit:
 707         nsim_dev_dummy_region_exit(nsim_dev);
 708 err_params_unregister:
 709         devlink_params_unregister(devlink, nsim_devlink_params,
 710                                   ARRAY_SIZE(nsim_devlink_params));
 711 err_dl_unregister:
 712         devlink_unregister(devlink);
 713 err_resources_unregister:
 714         devlink_resources_unregister(devlink, NULL);
 715 err_devlink_free:
 716         devlink_free(devlink);
 717         return ERR_PTR(err);
 718 }
 719
 720 static void nsim_dev_destroy(struct nsim_dev *nsim_dev)
 721 {
 722         struct devlink *devlink = priv_to_devlink(nsim_dev);
 723
 724         nsim_bpf_dev_exit(nsim_dev);
 725         nsim_dev_debugfs_exit(nsim_dev);
 726         nsim_dev_traps_exit(devlink);
 727         nsim_dev_dummy_region_exit(nsim_dev);
 728         devlink_params_unregister(devlink, nsim_devlink_params,
 729                                   ARRAY_SIZE(nsim_devlink_params));
 730         devlink_unregister(devlink);
 731         devlink_resources_unregister(devlink, NULL);
 732         mutex_destroy(&nsim_dev->port_list_lock);
 733         devlink_free(devlink);
 734 }
 735
 736 static int __nsim_dev_port_add(struct nsim_dev *nsim_dev,
 737                                unsigned int port_index)
 738 {
 739         struct nsim_dev_port *nsim_dev_port;
 740         struct devlink_port *devlink_port;
 741         int err;
 742
 743         nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL);
 744         if (!nsim_dev_port)
 745                 return -ENOMEM;
 746         nsim_dev_port->port_index = port_index;
 747
 748         devlink_port = &nsim_dev_port->devlink_port;
 749         devlink_port_attrs_set(devlink_port, DEVLINK_PORT_FLAVOUR_PHYSICAL,
 750                                port_index + 1, 0, 0,
 751                                nsim_dev->switch_id.id,
 752                                nsim_dev->switch_id.id_len);
 753         err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port,
 754                                     port_index);
 755         if (err)
 756                 goto err_port_free;
 757
 758         err = nsim_dev_port_debugfs_init(nsim_dev, nsim_dev_port);
 759         if (err)
 760                 goto err_dl_port_unregister;
 761
 762         nsim_dev_port->ns = nsim_create(nsim_dev, nsim_dev_port);
 763         if (IS_ERR(nsim_dev_port->ns)) {
 764                 err = PTR_ERR(nsim_dev_port->ns);
 765                 goto err_port_debugfs_exit;
 766         }
 767
 768         devlink_port_type_eth_set(devlink_port, nsim_dev_port->ns->netdev);
 769         list_add(&nsim_dev_port->list, &nsim_dev->port_list);
 770
 771         return 0;
 772
 773 err_port_debugfs_exit:
 774         nsim_dev_port_debugfs_exit(nsim_dev_port);
 775 err_dl_port_unregister:
 776         devlink_port_unregister(devlink_port);
 777 err_port_free:
 778         kfree(nsim_dev_port);
 779         return err;
 780 }
 781
 782 static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port)
 783 {
 784         struct devlink_port *devlink_port = &nsim_dev_port->devlink_port;
 785
 786         list_del(&nsim_dev_port->list);
 787         devlink_port_type_clear(devlink_port);
 788         nsim_destroy(nsim_dev_port->ns);
 789         nsim_dev_port_debugfs_exit(nsim_dev_port);
 790         devlink_port_unregister(devlink_port);
 791         kfree(nsim_dev_port);
 792 }
 793
 794 static void nsim_dev_port_del_all(struct nsim_dev *nsim_dev)
 795 {
 796         struct nsim_dev_port *nsim_dev_port, *tmp;
 797
 798         list_for_each_entry_safe(nsim_dev_port, tmp,
 799                                  &nsim_dev->port_list, list)
 800                 __nsim_dev_port_del(nsim_dev_port);
 801 }
 802
 803 int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
 804 {
 805         struct nsim_dev *nsim_dev;
 806         int i;
 807         int err;
 808
 809         nsim_dev = nsim_dev_create(nsim_bus_dev, nsim_bus_dev->port_count);
 810         if (IS_ERR(nsim_dev))
 811                 return PTR_ERR(nsim_dev);
 812         dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
 813
 814         for (i = 0; i < nsim_bus_dev->port_count; i++) {
 815                 err = __nsim_dev_port_add(nsim_dev, i);
 816                 if (err)
 817                         goto err_port_del_all;
 818         }
 819         return 0;
 820
 821 err_port_del_all:
 822         nsim_dev_port_del_all(nsim_dev);
 823         nsim_dev_destroy(nsim_dev);
 824         return err;
 825 }
 826
 827 void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
 828 {
 829         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 830
 831         nsim_dev_port_del_all(nsim_dev);
 832         nsim_dev_destroy(nsim_dev);
 833 }
 834
 835 static struct nsim_dev_port *
 836 __nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index)
 837 {
 838         struct nsim_dev_port *nsim_dev_port;
 839
 840         list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list)
 841                 if (nsim_dev_port->port_index == port_index)
 842                         return nsim_dev_port;
 843         return NULL;
 844 }
 845
 846 int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
 847                       unsigned int port_index)
 848 {
 849         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 850         int err;
 851
 852         mutex_lock(&nsim_dev->port_list_lock);
 853         if (__nsim_dev_port_lookup(nsim_dev, port_index))
 854                 err = -EEXIST;
 855         else
 856                 err = __nsim_dev_port_add(nsim_dev, port_index);
 857         mutex_unlock(&nsim_dev->port_list_lock);
 858         return err;
 859 }
 860
 861 int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
 862                       unsigned int port_index)
 863 {
 864         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 865         struct nsim_dev_port *nsim_dev_port;
 866         int err = 0;
 867
 868         mutex_lock(&nsim_dev->port_list_lock);
 869         nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, port_index);
 870         if (!nsim_dev_port)
 871                 err = -ENOENT;
 872         else
 873                 __nsim_dev_port_del(nsim_dev_port);
 874         mutex_unlock(&nsim_dev->port_list_lock);
 875         return err;
 876 }
 877
 878 int nsim_dev_init(void)
 879 {
 880         nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL);
 881         if (IS_ERR_OR_NULL(nsim_dev_ddir))
 882                 return -ENOMEM;
 883         return 0;
 884 }
 885
 886 void nsim_dev_exit(void)
 887 {
 888         debugfs_remove_recursive(nsim_dev_ddir);
 889 }