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 u64 nsim_dev_ipv4_fib_resource_occ_get(void *priv)
 127 {
 128         struct nsim_dev *nsim_dev = priv;
 129
 130         return nsim_fib_get_val(nsim_dev->fib_data,
 131                                 NSIM_RESOURCE_IPV4_FIB, false);
 132 }
 133
 134 static u64 nsim_dev_ipv4_fib_rules_res_occ_get(void *priv)
 135 {
 136         struct nsim_dev *nsim_dev = priv;
 137
 138         return nsim_fib_get_val(nsim_dev->fib_data,
 139                                 NSIM_RESOURCE_IPV4_FIB_RULES, false);
 140 }
 141
 142 static u64 nsim_dev_ipv6_fib_resource_occ_get(void *priv)
 143 {
 144         struct nsim_dev *nsim_dev = priv;
 145
 146         return nsim_fib_get_val(nsim_dev->fib_data,
 147                                 NSIM_RESOURCE_IPV6_FIB, false);
 148 }
 149
 150 static u64 nsim_dev_ipv6_fib_rules_res_occ_get(void *priv)
 151 {
 152         struct nsim_dev *nsim_dev = priv;
 153
 154         return nsim_fib_get_val(nsim_dev->fib_data,
 155                                 NSIM_RESOURCE_IPV6_FIB_RULES, false);
 156 }
 157
 158 static int nsim_dev_resources_register(struct devlink *devlink)
 159 {
 160         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 161         struct devlink_resource_size_params params = {
 162                 .size_max = (u64)-1,
 163                 .size_granularity = 1,
 164                 .unit = DEVLINK_RESOURCE_UNIT_ENTRY
 165         };
 166         int err;
 167         u64 n;
 168
 169         /* Resources for IPv4 */
 170         err = devlink_resource_register(devlink, "IPv4", (u64)-1,
 171                                         NSIM_RESOURCE_IPV4,
 172                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 173                                         &params);
 174         if (err) {
 175                 pr_err("Failed to register IPv4 top resource\n");
 176                 goto out;
 177         }
 178
 179         n = nsim_fib_get_val(nsim_dev->fib_data,
 180                              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(nsim_dev->fib_data,
 190                              NSIM_RESOURCE_IPV4_FIB_RULES, true);
 191         err = devlink_resource_register(devlink, "fib-rules", n,
 192                                         NSIM_RESOURCE_IPV4_FIB_RULES,
 193                                         NSIM_RESOURCE_IPV4, &params);
 194         if (err) {
 195                 pr_err("Failed to register IPv4 FIB rules resource\n");
 196                 return err;
 197         }
 198
 199         /* Resources for IPv6 */
 200         err = devlink_resource_register(devlink, "IPv6", (u64)-1,
 201                                         NSIM_RESOURCE_IPV6,
 202                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 203                                         &params);
 204         if (err) {
 205                 pr_err("Failed to register IPv6 top resource\n");
 206                 goto out;
 207         }
 208
 209         n = nsim_fib_get_val(nsim_dev->fib_data,
 210                              NSIM_RESOURCE_IPV6_FIB, true);
 211         err = devlink_resource_register(devlink, "fib", n,
 212                                         NSIM_RESOURCE_IPV6_FIB,
 213                                         NSIM_RESOURCE_IPV6, &params);
 214         if (err) {
 215                 pr_err("Failed to register IPv6 FIB resource\n");
 216                 return err;
 217         }
 218
 219         n = nsim_fib_get_val(nsim_dev->fib_data,
 220                              NSIM_RESOURCE_IPV6_FIB_RULES, true);
 221         err = devlink_resource_register(devlink, "fib-rules", n,
 222                                         NSIM_RESOURCE_IPV6_FIB_RULES,
 223                                         NSIM_RESOURCE_IPV6, &params);
 224         if (err) {
 225                 pr_err("Failed to register IPv6 FIB rules resource\n");
 226                 return err;
 227         }
 228
 229         devlink_resource_occ_get_register(devlink,
 230                                           NSIM_RESOURCE_IPV4_FIB,
 231                                           nsim_dev_ipv4_fib_resource_occ_get,
 232                                           nsim_dev);
 233         devlink_resource_occ_get_register(devlink,
 234                                           NSIM_RESOURCE_IPV4_FIB_RULES,
 235                                           nsim_dev_ipv4_fib_rules_res_occ_get,
 236                                           nsim_dev);
 237         devlink_resource_occ_get_register(devlink,
 238                                           NSIM_RESOURCE_IPV6_FIB,
 239                                           nsim_dev_ipv6_fib_resource_occ_get,
 240                                           nsim_dev);
 241         devlink_resource_occ_get_register(devlink,
 242                                           NSIM_RESOURCE_IPV6_FIB_RULES,
 243                                           nsim_dev_ipv6_fib_rules_res_occ_get,
 244                                           nsim_dev);
 245 out:
 246         return err;
 247 }
 248
 249 enum nsim_devlink_param_id {
 250         NSIM_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
 251         NSIM_DEVLINK_PARAM_ID_TEST1,
 252 };
 253
 254 static const struct devlink_param nsim_devlink_params[] = {
 255         DEVLINK_PARAM_GENERIC(MAX_MACS,
 256                               BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 257                               NULL, NULL, NULL),
 258         DEVLINK_PARAM_DRIVER(NSIM_DEVLINK_PARAM_ID_TEST1,
 259                              "test1", DEVLINK_PARAM_TYPE_BOOL,
 260                              BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 261                              NULL, NULL, NULL),
 262 };
 263
 264 static void nsim_devlink_set_params_init_values(struct nsim_dev *nsim_dev,
 265                                                 struct devlink *devlink)
 266 {
 267         union devlink_param_value value;
 268
 269         value.vu32 = nsim_dev->max_macs;
 270         devlink_param_driverinit_value_set(devlink,
 271                                            DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
 272                                            value);
 273         value.vbool = nsim_dev->test1;
 274         devlink_param_driverinit_value_set(devlink,
 275                                            NSIM_DEVLINK_PARAM_ID_TEST1,
 276                                            value);
 277 }
 278
 279 static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink)
 280 {
 281         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 282         union devlink_param_value saved_value;
 283         int err;
 284
 285         err = devlink_param_driverinit_value_get(devlink,
 286                                                  DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
 287                                                  &saved_value);
 288         if (!err)
 289                 nsim_dev->max_macs = saved_value.vu32;
 290         err = devlink_param_driverinit_value_get(devlink,
 291                                                  NSIM_DEVLINK_PARAM_ID_TEST1,
 292                                                  &saved_value);
 293         if (!err)
 294                 nsim_dev->test1 = saved_value.vbool;
 295 }
 296
 297 #define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16
 298
 299 static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,
 300                                       struct devlink *devlink)
 301 {
 302         nsim_dev->dummy_region =
 303                 devlink_region_create(devlink, "dummy",
 304                                       NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX,
 305                                       NSIM_DEV_DUMMY_REGION_SIZE);
 306         return PTR_ERR_OR_ZERO(nsim_dev->dummy_region);
 307 }
 308
 309 static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev)
 310 {
 311         devlink_region_destroy(nsim_dev->dummy_region);
 312 }
 313
 314 struct nsim_trap_item {
 315         void *trap_ctx;
 316         enum devlink_trap_action action;
 317 };
 318
 319 struct nsim_trap_data {
 320         struct delayed_work trap_report_dw;
 321         struct nsim_trap_item *trap_items_arr;
 322         struct nsim_dev *nsim_dev;
 323         spinlock_t trap_lock;   /* Protects trap_items_arr */
 324 };
 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         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 527         enum nsim_resource_id res_ids[] = {
 528                 NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
 529                 NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
 530         };
 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(nsim_dev->fib_data,
 540                                                res_ids[i], val, extack);
 541                         if (err)
 542                                 return err;
 543                 }
 544         }
 545         nsim_devlink_param_load_driverinit_values(devlink);
 546
 547         return 0;
 548 }
 549
 550 #define NSIM_DEV_FLASH_SIZE 500000
 551 #define NSIM_DEV_FLASH_CHUNK_SIZE 1000
 552 #define NSIM_DEV_FLASH_CHUNK_TIME_MS 10
 553
 554 static int nsim_dev_flash_update(struct devlink *devlink, const char *file_name,
 555                                  const char *component,
 556                                  struct netlink_ext_ack *extack)
 557 {
 558         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 559         int i;
 560
 561         if (nsim_dev->fw_update_status) {
 562                 devlink_flash_update_begin_notify(devlink);
 563                 devlink_flash_update_status_notify(devlink,
 564                                                    "Preparing to flash",
 565                                                    component, 0, 0);
 566         }
 567
 568         for (i = 0; i < NSIM_DEV_FLASH_SIZE / NSIM_DEV_FLASH_CHUNK_SIZE; i++) {
 569                 if (nsim_dev->fw_update_status)
 570                         devlink_flash_update_status_notify(devlink, "Flashing",
 571                                                            component,
 572                                                            i * NSIM_DEV_FLASH_CHUNK_SIZE,
 573                                                            NSIM_DEV_FLASH_SIZE);
 574                 msleep(NSIM_DEV_FLASH_CHUNK_TIME_MS);
 575         }
 576
 577         if (nsim_dev->fw_update_status) {
 578                 devlink_flash_update_status_notify(devlink, "Flashing",
 579                                                    component,
 580                                                    NSIM_DEV_FLASH_SIZE,
 581                                                    NSIM_DEV_FLASH_SIZE);
 582                 devlink_flash_update_status_notify(devlink, "Flashing done",
 583                                                    component, 0, 0);
 584                 devlink_flash_update_end_notify(devlink);
 585         }
 586
 587         return 0;
 588 }
 589
 590 static struct nsim_trap_item *
 591 nsim_dev_trap_item_lookup(struct nsim_dev *nsim_dev, u16 trap_id)
 592 {
 593         struct nsim_trap_data *nsim_trap_data = nsim_dev->trap_data;
 594         int i;
 595
 596         for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
 597                 if (nsim_traps_arr[i].id == trap_id)
 598                         return &nsim_trap_data->trap_items_arr[i];
 599         }
 600
 601         return NULL;
 602 }
 603
 604 static int nsim_dev_devlink_trap_init(struct devlink *devlink,
 605                                       const struct devlink_trap *trap,
 606                                       void *trap_ctx)
 607 {
 608         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 609         struct nsim_trap_item *nsim_trap_item;
 610
 611         nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
 612         if (WARN_ON(!nsim_trap_item))
 613                 return -ENOENT;
 614
 615         nsim_trap_item->trap_ctx = trap_ctx;
 616         nsim_trap_item->action = trap->init_action;
 617
 618         return 0;
 619 }
 620
 621 static int
 622 nsim_dev_devlink_trap_action_set(struct devlink *devlink,
 623                                  const struct devlink_trap *trap,
 624                                  enum devlink_trap_action action)
 625 {
 626         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 627         struct nsim_trap_item *nsim_trap_item;
 628
 629         nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
 630         if (WARN_ON(!nsim_trap_item))
 631                 return -ENOENT;
 632
 633         spin_lock(&nsim_dev->trap_data->trap_lock);
 634         nsim_trap_item->action = action;
 635         spin_unlock(&nsim_dev->trap_data->trap_lock);
 636
 637         return 0;
 638 }
 639
 640 static const struct devlink_ops nsim_dev_devlink_ops = {
 641         .reload = nsim_dev_reload,
 642         .flash_update = nsim_dev_flash_update,
 643         .trap_init = nsim_dev_devlink_trap_init,
 644         .trap_action_set = nsim_dev_devlink_trap_action_set,
 645 };
 646
 647 #define NSIM_DEV_MAX_MACS_DEFAULT 32
 648 #define NSIM_DEV_TEST1_DEFAULT true
 649
 650 static struct nsim_dev *
 651 nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev, unsigned int port_count)
 652 {
 653         struct nsim_dev *nsim_dev;
 654         struct devlink *devlink;
 655         int err;
 656
 657         devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
 658         if (!devlink)
 659                 return ERR_PTR(-ENOMEM);
 660         nsim_dev = devlink_priv(devlink);
 661         nsim_dev->nsim_bus_dev = nsim_bus_dev;
 662         nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
 663         get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
 664         INIT_LIST_HEAD(&nsim_dev->port_list);
 665         mutex_init(&nsim_dev->port_list_lock);
 666         nsim_dev->fw_update_status = true;
 667         nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
 668         nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT;
 669
 670         nsim_dev->fib_data = nsim_fib_create();
 671         if (IS_ERR(nsim_dev->fib_data)) {
 672                 err = PTR_ERR(nsim_dev->fib_data);
 673                 goto err_devlink_free;
 674         }
 675
 676         err = nsim_dev_resources_register(devlink);
 677         if (err)
 678                 goto err_fib_destroy;
 679
 680         err = devlink_register(devlink, &nsim_bus_dev->dev);
 681         if (err)
 682                 goto err_resources_unregister;
 683
 684         err = devlink_params_register(devlink, nsim_devlink_params,
 685                                       ARRAY_SIZE(nsim_devlink_params));
 686         if (err)
 687                 goto err_dl_unregister;
 688         nsim_devlink_set_params_init_values(nsim_dev, devlink);
 689
 690         err = nsim_dev_dummy_region_init(nsim_dev, devlink);
 691         if (err)
 692                 goto err_params_unregister;
 693
 694         err = nsim_dev_traps_init(devlink);
 695         if (err)
 696                 goto err_dummy_region_exit;
 697
 698         err = nsim_dev_debugfs_init(nsim_dev);
 699         if (err)
 700                 goto err_traps_exit;
 701
 702         err = nsim_bpf_dev_init(nsim_dev);
 703         if (err)
 704                 goto err_debugfs_exit;
 705
 706         devlink_params_publish(devlink);
 707         return nsim_dev;
 708
 709 err_debugfs_exit:
 710         nsim_dev_debugfs_exit(nsim_dev);
 711 err_traps_exit:
 712         nsim_dev_traps_exit(devlink);
 713 err_dummy_region_exit:
 714         nsim_dev_dummy_region_exit(nsim_dev);
 715 err_params_unregister:
 716         devlink_params_unregister(devlink, nsim_devlink_params,
 717                                   ARRAY_SIZE(nsim_devlink_params));
 718 err_dl_unregister:
 719         devlink_unregister(devlink);
 720 err_resources_unregister:
 721         devlink_resources_unregister(devlink, NULL);
 722 err_fib_destroy:
 723         nsim_fib_destroy(nsim_dev->fib_data);
 724 err_devlink_free:
 725         devlink_free(devlink);
 726         return ERR_PTR(err);
 727 }
 728
 729 static void nsim_dev_destroy(struct nsim_dev *nsim_dev)
 730 {
 731         struct devlink *devlink = priv_to_devlink(nsim_dev);
 732
 733         nsim_bpf_dev_exit(nsim_dev);
 734         nsim_dev_debugfs_exit(nsim_dev);
 735         nsim_dev_traps_exit(devlink);
 736         nsim_dev_dummy_region_exit(nsim_dev);
 737         devlink_params_unregister(devlink, nsim_devlink_params,
 738                                   ARRAY_SIZE(nsim_devlink_params));
 739         devlink_unregister(devlink);
 740         devlink_resources_unregister(devlink, NULL);
 741         nsim_fib_destroy(nsim_dev->fib_data);
 742         mutex_destroy(&nsim_dev->port_list_lock);
 743         devlink_free(devlink);
 744 }
 745
 746 static int __nsim_dev_port_add(struct nsim_dev *nsim_dev,
 747                                unsigned int port_index)
 748 {
 749         struct nsim_dev_port *nsim_dev_port;
 750         struct devlink_port *devlink_port;
 751         int err;
 752
 753         nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL);
 754         if (!nsim_dev_port)
 755                 return -ENOMEM;
 756         nsim_dev_port->port_index = port_index;
 757
 758         devlink_port = &nsim_dev_port->devlink_port;
 759         devlink_port_attrs_set(devlink_port, DEVLINK_PORT_FLAVOUR_PHYSICAL,
 760                                port_index + 1, 0, 0,
 761                                nsim_dev->switch_id.id,
 762                                nsim_dev->switch_id.id_len);
 763         err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port,
 764                                     port_index);
 765         if (err)
 766                 goto err_port_free;
 767
 768         err = nsim_dev_port_debugfs_init(nsim_dev, nsim_dev_port);
 769         if (err)
 770                 goto err_dl_port_unregister;
 771
 772         nsim_dev_port->ns = nsim_create(nsim_dev, nsim_dev_port);
 773         if (IS_ERR(nsim_dev_port->ns)) {
 774                 err = PTR_ERR(nsim_dev_port->ns);
 775                 goto err_port_debugfs_exit;
 776         }
 777
 778         devlink_port_type_eth_set(devlink_port, nsim_dev_port->ns->netdev);
 779         list_add(&nsim_dev_port->list, &nsim_dev->port_list);
 780
 781         return 0;
 782
 783 err_port_debugfs_exit:
 784         nsim_dev_port_debugfs_exit(nsim_dev_port);
 785 err_dl_port_unregister:
 786         devlink_port_unregister(devlink_port);
 787 err_port_free:
 788         kfree(nsim_dev_port);
 789         return err;
 790 }
 791
 792 static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port)
 793 {
 794         struct devlink_port *devlink_port = &nsim_dev_port->devlink_port;
 795
 796         list_del(&nsim_dev_port->list);
 797         devlink_port_type_clear(devlink_port);
 798         nsim_destroy(nsim_dev_port->ns);
 799         nsim_dev_port_debugfs_exit(nsim_dev_port);
 800         devlink_port_unregister(devlink_port);
 801         kfree(nsim_dev_port);
 802 }
 803
 804 static void nsim_dev_port_del_all(struct nsim_dev *nsim_dev)
 805 {
 806         struct nsim_dev_port *nsim_dev_port, *tmp;
 807
 808         list_for_each_entry_safe(nsim_dev_port, tmp,
 809                                  &nsim_dev->port_list, list)
 810                 __nsim_dev_port_del(nsim_dev_port);
 811 }
 812
 813 int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
 814 {
 815         struct nsim_dev *nsim_dev;
 816         int i;
 817         int err;
 818
 819         nsim_dev = nsim_dev_create(nsim_bus_dev, nsim_bus_dev->port_count);
 820         if (IS_ERR(nsim_dev))
 821                 return PTR_ERR(nsim_dev);
 822         dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
 823
 824         for (i = 0; i < nsim_bus_dev->port_count; i++) {
 825                 err = __nsim_dev_port_add(nsim_dev, i);
 826                 if (err)
 827                         goto err_port_del_all;
 828         }
 829         return 0;
 830
 831 err_port_del_all:
 832         nsim_dev_port_del_all(nsim_dev);
 833         nsim_dev_destroy(nsim_dev);
 834         return err;
 835 }
 836
 837 void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
 838 {
 839         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 840
 841         nsim_dev_port_del_all(nsim_dev);
 842         nsim_dev_destroy(nsim_dev);
 843 }
 844
 845 static struct nsim_dev_port *
 846 __nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index)
 847 {
 848         struct nsim_dev_port *nsim_dev_port;
 849
 850         list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list)
 851                 if (nsim_dev_port->port_index == port_index)
 852                         return nsim_dev_port;
 853         return NULL;
 854 }
 855
 856 int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
 857                       unsigned int port_index)
 858 {
 859         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 860         int err;
 861
 862         mutex_lock(&nsim_dev->port_list_lock);
 863         if (__nsim_dev_port_lookup(nsim_dev, port_index))
 864                 err = -EEXIST;
 865         else
 866                 err = __nsim_dev_port_add(nsim_dev, port_index);
 867         mutex_unlock(&nsim_dev->port_list_lock);
 868         return err;
 869 }
 870
 871 int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
 872                       unsigned int port_index)
 873 {
 874         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 875         struct nsim_dev_port *nsim_dev_port;
 876         int err = 0;
 877
 878         mutex_lock(&nsim_dev->port_list_lock);
 879         nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, port_index);
 880         if (!nsim_dev_port)
 881                 err = -ENOENT;
 882         else
 883                 __nsim_dev_port_del(nsim_dev_port);
 884         mutex_unlock(&nsim_dev->port_list_lock);
 885         return err;
 886 }
 887
 888 int nsim_dev_init(void)
 889 {
 890         nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL);
 891         if (IS_ERR_OR_NULL(nsim_dev_ddir))
 892                 return -ENOMEM;
 893         return 0;
 894 }
 895
 896 void nsim_dev_exit(void)
 897 {
 898         debugfs_remove_recursive(nsim_dev_ddir);
 899 }