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 <net/flow_offload.h>
  32 #include <uapi/linux/devlink.h>
  33 #include <uapi/linux/ip.h>
  34 #include <uapi/linux/udp.h>
  35
  36 #include "netdevsim.h"
  37
  38 static struct dentry *nsim_dev_ddir;
  39
  40 #define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)
  41
  42 static int
  43 nsim_dev_take_snapshot(struct devlink *devlink,
  44                        const struct devlink_region_ops *ops,
  45                        struct netlink_ext_ack *extack,
  46                        u8 **data)
  47 {
  48         void *dummy_data;
  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         *data = dummy_data;
  57
  58         return 0;
  59 }
  60
  61 static ssize_t nsim_dev_take_snapshot_write(struct file *file,
  62                                             const char __user *data,
  63                                             size_t count, loff_t *ppos)
  64 {
  65         struct nsim_dev *nsim_dev = file->private_data;
  66         struct devlink *devlink;
  67         u8 *dummy_data;
  68         int err;
  69         u32 id;
  70
  71         devlink = priv_to_devlink(nsim_dev);
  72
  73         err = nsim_dev_take_snapshot(devlink, NULL, NULL, &dummy_data);
  74         if (err)
  75                 return err;
  76
  77         err = devlink_region_snapshot_id_get(devlink, &id);
  78         if (err) {
  79                 pr_err("Failed to get snapshot id\n");
  80                 kfree(dummy_data);
  81                 return err;
  82         }
  83         err = devlink_region_snapshot_create(nsim_dev->dummy_region,
  84                                              dummy_data, id);
  85         devlink_region_snapshot_id_put(devlink, id);
  86         if (err) {
  87                 pr_err("Failed to create region snapshot\n");
  88                 kfree(dummy_data);
  89                 return err;
  90         }
  91
  92         return count;
  93 }
  94
  95 static const struct file_operations nsim_dev_take_snapshot_fops = {
  96         .open = simple_open,
  97         .write = nsim_dev_take_snapshot_write,
  98         .llseek = generic_file_llseek,
  99         .owner = THIS_MODULE,
 100 };
 101
 102 static ssize_t nsim_dev_trap_fa_cookie_read(struct file *file,
 103                                             char __user *data,
 104                                             size_t count, loff_t *ppos)
 105 {
 106         struct nsim_dev *nsim_dev = file->private_data;
 107         struct flow_action_cookie *fa_cookie;
 108         unsigned int buf_len;
 109         ssize_t ret;
 110         char *buf;
 111
 112         spin_lock(&nsim_dev->fa_cookie_lock);
 113         fa_cookie = nsim_dev->fa_cookie;
 114         if (!fa_cookie) {
 115                 ret = -EINVAL;
 116                 goto errout;
 117         }
 118         buf_len = fa_cookie->cookie_len * 2;
 119         buf = kmalloc(buf_len, GFP_ATOMIC);
 120         if (!buf) {
 121                 ret = -ENOMEM;
 122                 goto errout;
 123         }
 124         bin2hex(buf, fa_cookie->cookie, fa_cookie->cookie_len);
 125         spin_unlock(&nsim_dev->fa_cookie_lock);
 126
 127         ret = simple_read_from_buffer(data, count, ppos, buf, buf_len);
 128
 129         kfree(buf);
 130         return ret;
 131
 132 errout:
 133         spin_unlock(&nsim_dev->fa_cookie_lock);
 134         return ret;
 135 }
 136
 137 static ssize_t nsim_dev_trap_fa_cookie_write(struct file *file,
 138                                              const char __user *data,
 139                                              size_t count, loff_t *ppos)
 140 {
 141         struct nsim_dev *nsim_dev = file->private_data;
 142         struct flow_action_cookie *fa_cookie;
 143         size_t cookie_len;
 144         ssize_t ret;
 145         char *buf;
 146
 147         if (*ppos != 0)
 148                 return -EINVAL;
 149         cookie_len = (count - 1) / 2;
 150         if ((count - 1) % 2)
 151                 return -EINVAL;
 152
 153         buf = memdup_user(data, count);
 154         if (IS_ERR(buf))
 155                 return PTR_ERR(buf);
 156
 157         fa_cookie = kmalloc(sizeof(*fa_cookie) + cookie_len,
 158                             GFP_KERNEL | __GFP_NOWARN);
 159         if (!fa_cookie) {
 160                 ret = -ENOMEM;
 161                 goto free_buf;
 162         }
 163
 164         fa_cookie->cookie_len = cookie_len;
 165         ret = hex2bin(fa_cookie->cookie, buf, cookie_len);
 166         if (ret)
 167                 goto free_fa_cookie;
 168         kfree(buf);
 169
 170         spin_lock(&nsim_dev->fa_cookie_lock);
 171         kfree(nsim_dev->fa_cookie);
 172         nsim_dev->fa_cookie = fa_cookie;
 173         spin_unlock(&nsim_dev->fa_cookie_lock);
 174
 175         return count;
 176
 177 free_fa_cookie:
 178         kfree(fa_cookie);
 179 free_buf:
 180         kfree(buf);
 181         return ret;
 182 }
 183
 184 static const struct file_operations nsim_dev_trap_fa_cookie_fops = {
 185         .open = simple_open,
 186         .read = nsim_dev_trap_fa_cookie_read,
 187         .write = nsim_dev_trap_fa_cookie_write,
 188         .llseek = generic_file_llseek,
 189         .owner = THIS_MODULE,
 190 };
 191
 192 static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
 193 {
 194         char dev_ddir_name[sizeof(DRV_NAME) + 10];
 195
 196         sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id);
 197         nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir);
 198         if (IS_ERR(nsim_dev->ddir))
 199                 return PTR_ERR(nsim_dev->ddir);
 200         nsim_dev->ports_ddir = debugfs_create_dir("ports", nsim_dev->ddir);
 201         if (IS_ERR(nsim_dev->ports_ddir))
 202                 return PTR_ERR(nsim_dev->ports_ddir);
 203         debugfs_create_bool("fw_update_status", 0600, nsim_dev->ddir,
 204                             &nsim_dev->fw_update_status);
 205         debugfs_create_u32("fw_update_overwrite_mask", 0600, nsim_dev->ddir,
 206                             &nsim_dev->fw_update_overwrite_mask);
 207         debugfs_create_u32("max_macs", 0600, nsim_dev->ddir,
 208                            &nsim_dev->max_macs);
 209         debugfs_create_bool("test1", 0600, nsim_dev->ddir,
 210                             &nsim_dev->test1);
 211         nsim_dev->take_snapshot = debugfs_create_file("take_snapshot",
 212                                                       0200,
 213                                                       nsim_dev->ddir,
 214                                                       nsim_dev,
 215                                                 &nsim_dev_take_snapshot_fops);
 216         debugfs_create_bool("dont_allow_reload", 0600, nsim_dev->ddir,
 217                             &nsim_dev->dont_allow_reload);
 218         debugfs_create_bool("fail_reload", 0600, nsim_dev->ddir,
 219                             &nsim_dev->fail_reload);
 220         debugfs_create_file("trap_flow_action_cookie", 0600, nsim_dev->ddir,
 221                             nsim_dev, &nsim_dev_trap_fa_cookie_fops);
 222         debugfs_create_bool("fail_trap_group_set", 0600,
 223                             nsim_dev->ddir,
 224                             &nsim_dev->fail_trap_group_set);
 225         debugfs_create_bool("fail_trap_policer_set", 0600,
 226                             nsim_dev->ddir,
 227                             &nsim_dev->fail_trap_policer_set);
 228         debugfs_create_bool("fail_trap_policer_counter_get", 0600,
 229                             nsim_dev->ddir,
 230                             &nsim_dev->fail_trap_policer_counter_get);
 231         nsim_udp_tunnels_debugfs_create(nsim_dev);
 232         return 0;
 233 }
 234
 235 static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
 236 {
 237         debugfs_remove_recursive(nsim_dev->ports_ddir);
 238         debugfs_remove_recursive(nsim_dev->ddir);
 239 }
 240
 241 static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
 242                                       struct nsim_dev_port *nsim_dev_port)
 243 {
 244         char port_ddir_name[16];
 245         char dev_link_name[32];
 246
 247         sprintf(port_ddir_name, "%u", nsim_dev_port->port_index);
 248         nsim_dev_port->ddir = debugfs_create_dir(port_ddir_name,
 249                                                  nsim_dev->ports_ddir);
 250         if (IS_ERR(nsim_dev_port->ddir))
 251                 return PTR_ERR(nsim_dev_port->ddir);
 252
 253         sprintf(dev_link_name, "../../../" DRV_NAME "%u",
 254                 nsim_dev->nsim_bus_dev->dev.id);
 255         debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name);
 256
 257         return 0;
 258 }
 259
 260 static void nsim_dev_port_debugfs_exit(struct nsim_dev_port *nsim_dev_port)
 261 {
 262         debugfs_remove_recursive(nsim_dev_port->ddir);
 263 }
 264
 265 static int nsim_dev_resources_register(struct devlink *devlink)
 266 {
 267         struct devlink_resource_size_params params = {
 268                 .size_max = (u64)-1,
 269                 .size_granularity = 1,
 270                 .unit = DEVLINK_RESOURCE_UNIT_ENTRY
 271         };
 272         int err;
 273
 274         /* Resources for IPv4 */
 275         err = devlink_resource_register(devlink, "IPv4", (u64)-1,
 276                                         NSIM_RESOURCE_IPV4,
 277                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 278                                         &params);
 279         if (err) {
 280                 pr_err("Failed to register IPv4 top resource\n");
 281                 goto out;
 282         }
 283
 284         err = devlink_resource_register(devlink, "fib", (u64)-1,
 285                                         NSIM_RESOURCE_IPV4_FIB,
 286                                         NSIM_RESOURCE_IPV4, &params);
 287         if (err) {
 288                 pr_err("Failed to register IPv4 FIB resource\n");
 289                 return err;
 290         }
 291
 292         err = devlink_resource_register(devlink, "fib-rules", (u64)-1,
 293                                         NSIM_RESOURCE_IPV4_FIB_RULES,
 294                                         NSIM_RESOURCE_IPV4, &params);
 295         if (err) {
 296                 pr_err("Failed to register IPv4 FIB rules resource\n");
 297                 return err;
 298         }
 299
 300         /* Resources for IPv6 */
 301         err = devlink_resource_register(devlink, "IPv6", (u64)-1,
 302                                         NSIM_RESOURCE_IPV6,
 303                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 304                                         &params);
 305         if (err) {
 306                 pr_err("Failed to register IPv6 top resource\n");
 307                 goto out;
 308         }
 309
 310         err = devlink_resource_register(devlink, "fib", (u64)-1,
 311                                         NSIM_RESOURCE_IPV6_FIB,
 312                                         NSIM_RESOURCE_IPV6, &params);
 313         if (err) {
 314                 pr_err("Failed to register IPv6 FIB resource\n");
 315                 return err;
 316         }
 317
 318         err = devlink_resource_register(devlink, "fib-rules", (u64)-1,
 319                                         NSIM_RESOURCE_IPV6_FIB_RULES,
 320                                         NSIM_RESOURCE_IPV6, &params);
 321         if (err) {
 322                 pr_err("Failed to register IPv6 FIB rules resource\n");
 323                 return err;
 324         }
 325
 326 out:
 327         return err;
 328 }
 329
 330 enum nsim_devlink_param_id {
 331         NSIM_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
 332         NSIM_DEVLINK_PARAM_ID_TEST1,
 333 };
 334
 335 static const struct devlink_param nsim_devlink_params[] = {
 336         DEVLINK_PARAM_GENERIC(MAX_MACS,
 337                               BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 338                               NULL, NULL, NULL),
 339         DEVLINK_PARAM_DRIVER(NSIM_DEVLINK_PARAM_ID_TEST1,
 340                              "test1", DEVLINK_PARAM_TYPE_BOOL,
 341                              BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 342                              NULL, NULL, NULL),
 343 };
 344
 345 static void nsim_devlink_set_params_init_values(struct nsim_dev *nsim_dev,
 346                                                 struct devlink *devlink)
 347 {
 348         union devlink_param_value value;
 349
 350         value.vu32 = nsim_dev->max_macs;
 351         devlink_param_driverinit_value_set(devlink,
 352                                            DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
 353                                            value);
 354         value.vbool = nsim_dev->test1;
 355         devlink_param_driverinit_value_set(devlink,
 356                                            NSIM_DEVLINK_PARAM_ID_TEST1,
 357                                            value);
 358 }
 359
 360 static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink)
 361 {
 362         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 363         union devlink_param_value saved_value;
 364         int err;
 365
 366         err = devlink_param_driverinit_value_get(devlink,
 367                                                  DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
 368                                                  &saved_value);
 369         if (!err)
 370                 nsim_dev->max_macs = saved_value.vu32;
 371         err = devlink_param_driverinit_value_get(devlink,
 372                                                  NSIM_DEVLINK_PARAM_ID_TEST1,
 373                                                  &saved_value);
 374         if (!err)
 375                 nsim_dev->test1 = saved_value.vbool;
 376 }
 377
 378 #define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16
 379
 380 static const struct devlink_region_ops dummy_region_ops = {
 381         .name = "dummy",
 382         .destructor = &kfree,
 383         .snapshot = nsim_dev_take_snapshot,
 384 };
 385
 386 static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,
 387                                       struct devlink *devlink)
 388 {
 389         nsim_dev->dummy_region =
 390                 devlink_region_create(devlink, &dummy_region_ops,
 391                                       NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX,
 392                                       NSIM_DEV_DUMMY_REGION_SIZE);
 393         return PTR_ERR_OR_ZERO(nsim_dev->dummy_region);
 394 }
 395
 396 static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev)
 397 {
 398         devlink_region_destroy(nsim_dev->dummy_region);
 399 }
 400
 401 struct nsim_trap_item {
 402         void *trap_ctx;
 403         enum devlink_trap_action action;
 404 };
 405
 406 struct nsim_trap_data {
 407         struct delayed_work trap_report_dw;
 408         struct nsim_trap_item *trap_items_arr;
 409         u64 *trap_policers_cnt_arr;
 410         struct nsim_dev *nsim_dev;
 411         spinlock_t trap_lock;   /* Protects trap_items_arr */
 412 };
 413
 414 /* All driver-specific traps must be documented in
 415  * Documentation/networking/devlink/netdevsim.rst
 416  */
 417 enum {
 418         NSIM_TRAP_ID_BASE = DEVLINK_TRAP_GENERIC_ID_MAX,
 419         NSIM_TRAP_ID_FID_MISS,
 420 };
 421
 422 #define NSIM_TRAP_NAME_FID_MISS "fid_miss"
 423
 424 #define NSIM_TRAP_METADATA DEVLINK_TRAP_METADATA_TYPE_F_IN_PORT
 425
 426 #define NSIM_TRAP_DROP(_id, _group_id)                                        \
 427         DEVLINK_TRAP_GENERIC(DROP, DROP, _id,                                 \
 428                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 429                              NSIM_TRAP_METADATA)
 430 #define NSIM_TRAP_DROP_EXT(_id, _group_id, _metadata)                         \
 431         DEVLINK_TRAP_GENERIC(DROP, DROP, _id,                                 \
 432                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 433                              NSIM_TRAP_METADATA | (_metadata))
 434 #define NSIM_TRAP_EXCEPTION(_id, _group_id)                                   \
 435         DEVLINK_TRAP_GENERIC(EXCEPTION, TRAP, _id,                            \
 436                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 437                              NSIM_TRAP_METADATA)
 438 #define NSIM_TRAP_CONTROL(_id, _group_id, _action)                            \
 439         DEVLINK_TRAP_GENERIC(CONTROL, _action, _id,                           \
 440                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 441                              NSIM_TRAP_METADATA)
 442 #define NSIM_TRAP_DRIVER_EXCEPTION(_id, _group_id)                            \
 443         DEVLINK_TRAP_DRIVER(EXCEPTION, TRAP, NSIM_TRAP_ID_##_id,              \
 444                             NSIM_TRAP_NAME_##_id,                             \
 445                             DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,        \
 446                             NSIM_TRAP_METADATA)
 447
 448 #define NSIM_DEV_TRAP_POLICER_MIN_RATE  1
 449 #define NSIM_DEV_TRAP_POLICER_MAX_RATE  8000
 450 #define NSIM_DEV_TRAP_POLICER_MIN_BURST 8
 451 #define NSIM_DEV_TRAP_POLICER_MAX_BURST 65536
 452
 453 #define NSIM_TRAP_POLICER(_id, _rate, _burst)                                 \
 454         DEVLINK_TRAP_POLICER(_id, _rate, _burst,                              \
 455                              NSIM_DEV_TRAP_POLICER_MAX_RATE,                  \
 456                              NSIM_DEV_TRAP_POLICER_MIN_RATE,                  \
 457                              NSIM_DEV_TRAP_POLICER_MAX_BURST,                 \
 458                              NSIM_DEV_TRAP_POLICER_MIN_BURST)
 459
 460 static const struct devlink_trap_policer nsim_trap_policers_arr[] = {
 461         NSIM_TRAP_POLICER(1, 1000, 128),
 462         NSIM_TRAP_POLICER(2, 2000, 256),
 463         NSIM_TRAP_POLICER(3, 3000, 512),
 464 };
 465
 466 static const struct devlink_trap_group nsim_trap_groups_arr[] = {
 467         DEVLINK_TRAP_GROUP_GENERIC(L2_DROPS, 0),
 468         DEVLINK_TRAP_GROUP_GENERIC(L3_DROPS, 1),
 469         DEVLINK_TRAP_GROUP_GENERIC(L3_EXCEPTIONS, 1),
 470         DEVLINK_TRAP_GROUP_GENERIC(BUFFER_DROPS, 2),
 471         DEVLINK_TRAP_GROUP_GENERIC(ACL_DROPS, 3),
 472         DEVLINK_TRAP_GROUP_GENERIC(MC_SNOOPING, 3),
 473 };
 474
 475 static const struct devlink_trap nsim_traps_arr[] = {
 476         NSIM_TRAP_DROP(SMAC_MC, L2_DROPS),
 477         NSIM_TRAP_DROP(VLAN_TAG_MISMATCH, L2_DROPS),
 478         NSIM_TRAP_DROP(INGRESS_VLAN_FILTER, L2_DROPS),
 479         NSIM_TRAP_DROP(INGRESS_STP_FILTER, L2_DROPS),
 480         NSIM_TRAP_DROP(EMPTY_TX_LIST, L2_DROPS),
 481         NSIM_TRAP_DROP(PORT_LOOPBACK_FILTER, L2_DROPS),
 482         NSIM_TRAP_DRIVER_EXCEPTION(FID_MISS, L2_DROPS),
 483         NSIM_TRAP_DROP(BLACKHOLE_ROUTE, L3_DROPS),
 484         NSIM_TRAP_EXCEPTION(TTL_ERROR, L3_EXCEPTIONS),
 485         NSIM_TRAP_DROP(TAIL_DROP, BUFFER_DROPS),
 486         NSIM_TRAP_DROP_EXT(INGRESS_FLOW_ACTION_DROP, ACL_DROPS,
 487                            DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE),
 488         NSIM_TRAP_DROP_EXT(EGRESS_FLOW_ACTION_DROP, ACL_DROPS,
 489                            DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE),
 490         NSIM_TRAP_CONTROL(IGMP_QUERY, MC_SNOOPING, MIRROR),
 491         NSIM_TRAP_CONTROL(IGMP_V1_REPORT, MC_SNOOPING, TRAP),
 492 };
 493
 494 #define NSIM_TRAP_L4_DATA_LEN 100
 495
 496 static struct sk_buff *nsim_dev_trap_skb_build(void)
 497 {
 498         int tot_len, data_len = NSIM_TRAP_L4_DATA_LEN;
 499         struct sk_buff *skb;
 500         struct udphdr *udph;
 501         struct ethhdr *eth;
 502         struct iphdr *iph;
 503
 504         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 505         if (!skb)
 506                 return NULL;
 507         tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + data_len;
 508
 509         skb_reset_mac_header(skb);
 510         eth = skb_put(skb, sizeof(struct ethhdr));
 511         eth_random_addr(eth->h_dest);
 512         eth_random_addr(eth->h_source);
 513         eth->h_proto = htons(ETH_P_IP);
 514         skb->protocol = htons(ETH_P_IP);
 515
 516         skb_set_network_header(skb, skb->len);
 517         iph = skb_put(skb, sizeof(struct iphdr));
 518         iph->protocol = IPPROTO_UDP;
 519         iph->saddr = in_aton("192.0.2.1");
 520         iph->daddr = in_aton("198.51.100.1");
 521         iph->version = 0x4;
 522         iph->frag_off = 0;
 523         iph->ihl = 0x5;
 524         iph->tot_len = htons(tot_len);
 525         iph->ttl = 100;
 526         iph->check = 0;
 527         iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 528
 529         skb_set_transport_header(skb, skb->len);
 530         udph = skb_put_zero(skb, sizeof(struct udphdr) + data_len);
 531         get_random_bytes(&udph->source, sizeof(u16));
 532         get_random_bytes(&udph->dest, sizeof(u16));
 533         udph->len = htons(sizeof(struct udphdr) + data_len);
 534
 535         return skb;
 536 }
 537
 538 static void nsim_dev_trap_report(struct nsim_dev_port *nsim_dev_port)
 539 {
 540         struct nsim_dev *nsim_dev = nsim_dev_port->ns->nsim_dev;
 541         struct devlink *devlink = priv_to_devlink(nsim_dev);
 542         struct nsim_trap_data *nsim_trap_data;
 543         int i;
 544
 545         nsim_trap_data = nsim_dev->trap_data;
 546
 547         spin_lock(&nsim_trap_data->trap_lock);
 548         for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
 549                 struct flow_action_cookie *fa_cookie = NULL;
 550                 struct nsim_trap_item *nsim_trap_item;
 551                 struct sk_buff *skb;
 552                 bool has_fa_cookie;
 553
 554                 has_fa_cookie = nsim_traps_arr[i].metadata_cap &
 555                                 DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE;
 556
 557                 nsim_trap_item = &nsim_trap_data->trap_items_arr[i];
 558                 if (nsim_trap_item->action == DEVLINK_TRAP_ACTION_DROP)
 559                         continue;
 560
 561                 skb = nsim_dev_trap_skb_build();
 562                 if (!skb)
 563                         continue;
 564                 skb->dev = nsim_dev_port->ns->netdev;
 565
 566                 /* Trapped packets are usually passed to devlink in softIRQ,
 567                  * but in this case they are generated in a workqueue. Disable
 568                  * softIRQs to prevent lockdep from complaining about
 569                  * "incosistent lock state".
 570                  */
 571
 572                 spin_lock_bh(&nsim_dev->fa_cookie_lock);
 573                 fa_cookie = has_fa_cookie ? nsim_dev->fa_cookie : NULL;
 574                 devlink_trap_report(devlink, skb, nsim_trap_item->trap_ctx,
 575                                     &nsim_dev_port->devlink_port, fa_cookie);
 576                 spin_unlock_bh(&nsim_dev->fa_cookie_lock);
 577                 consume_skb(skb);
 578         }
 579         spin_unlock(&nsim_trap_data->trap_lock);
 580 }
 581
 582 #define NSIM_TRAP_REPORT_INTERVAL_MS    100
 583
 584 static void nsim_dev_trap_report_work(struct work_struct *work)
 585 {
 586         struct nsim_trap_data *nsim_trap_data;
 587         struct nsim_dev_port *nsim_dev_port;
 588         struct nsim_dev *nsim_dev;
 589
 590         nsim_trap_data = container_of(work, struct nsim_trap_data,
 591                                       trap_report_dw.work);
 592         nsim_dev = nsim_trap_data->nsim_dev;
 593
 594         /* For each running port and enabled packet trap, generate a UDP
 595          * packet with a random 5-tuple and report it.
 596          */
 597         mutex_lock(&nsim_dev->port_list_lock);
 598         list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list) {
 599                 if (!netif_running(nsim_dev_port->ns->netdev))
 600                         continue;
 601
 602                 nsim_dev_trap_report(nsim_dev_port);
 603         }
 604         mutex_unlock(&nsim_dev->port_list_lock);
 605
 606         schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
 607                               msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));
 608 }
 609
 610 static int nsim_dev_traps_init(struct devlink *devlink)
 611 {
 612         size_t policers_count = ARRAY_SIZE(nsim_trap_policers_arr);
 613         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 614         struct nsim_trap_data *nsim_trap_data;
 615         int err;
 616
 617         nsim_trap_data = kzalloc(sizeof(*nsim_trap_data), GFP_KERNEL);
 618         if (!nsim_trap_data)
 619                 return -ENOMEM;
 620
 621         nsim_trap_data->trap_items_arr = kcalloc(ARRAY_SIZE(nsim_traps_arr),
 622                                                  sizeof(struct nsim_trap_item),
 623                                                  GFP_KERNEL);
 624         if (!nsim_trap_data->trap_items_arr) {
 625                 err = -ENOMEM;
 626                 goto err_trap_data_free;
 627         }
 628
 629         nsim_trap_data->trap_policers_cnt_arr = kcalloc(policers_count,
 630                                                         sizeof(u64),
 631                                                         GFP_KERNEL);
 632         if (!nsim_trap_data->trap_policers_cnt_arr) {
 633                 err = -ENOMEM;
 634                 goto err_trap_items_free;
 635         }
 636
 637         /* The lock is used to protect the action state of the registered
 638          * traps. The value is written by user and read in delayed work when
 639          * iterating over all the traps.
 640          */
 641         spin_lock_init(&nsim_trap_data->trap_lock);
 642         nsim_trap_data->nsim_dev = nsim_dev;
 643         nsim_dev->trap_data = nsim_trap_data;
 644
 645         err = devlink_trap_policers_register(devlink, nsim_trap_policers_arr,
 646                                              policers_count);
 647         if (err)
 648                 goto err_trap_policers_cnt_free;
 649
 650         err = devlink_trap_groups_register(devlink, nsim_trap_groups_arr,
 651                                            ARRAY_SIZE(nsim_trap_groups_arr));
 652         if (err)
 653                 goto err_trap_policers_unregister;
 654
 655         err = devlink_traps_register(devlink, nsim_traps_arr,
 656                                      ARRAY_SIZE(nsim_traps_arr), NULL);
 657         if (err)
 658                 goto err_trap_groups_unregister;
 659
 660         INIT_DELAYED_WORK(&nsim_dev->trap_data->trap_report_dw,
 661                           nsim_dev_trap_report_work);
 662         schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
 663                               msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));
 664
 665         return 0;
 666
 667 err_trap_groups_unregister:
 668         devlink_trap_groups_unregister(devlink, nsim_trap_groups_arr,
 669                                        ARRAY_SIZE(nsim_trap_groups_arr));
 670 err_trap_policers_unregister:
 671         devlink_trap_policers_unregister(devlink, nsim_trap_policers_arr,
 672                                          ARRAY_SIZE(nsim_trap_policers_arr));
 673 err_trap_policers_cnt_free:
 674         kfree(nsim_trap_data->trap_policers_cnt_arr);
 675 err_trap_items_free:
 676         kfree(nsim_trap_data->trap_items_arr);
 677 err_trap_data_free:
 678         kfree(nsim_trap_data);
 679         return err;
 680 }
 681
 682 static void nsim_dev_traps_exit(struct devlink *devlink)
 683 {
 684         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 685
 686         cancel_delayed_work_sync(&nsim_dev->trap_data->trap_report_dw);
 687         devlink_traps_unregister(devlink, nsim_traps_arr,
 688                                  ARRAY_SIZE(nsim_traps_arr));
 689         devlink_trap_groups_unregister(devlink, nsim_trap_groups_arr,
 690                                        ARRAY_SIZE(nsim_trap_groups_arr));
 691         devlink_trap_policers_unregister(devlink, nsim_trap_policers_arr,
 692                                          ARRAY_SIZE(nsim_trap_policers_arr));
 693         kfree(nsim_dev->trap_data->trap_policers_cnt_arr);
 694         kfree(nsim_dev->trap_data->trap_items_arr);
 695         kfree(nsim_dev->trap_data);
 696 }
 697
 698 static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
 699                                   struct netlink_ext_ack *extack);
 700 static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev);
 701
 702 static int nsim_dev_reload_down(struct devlink *devlink, bool netns_change,
 703                                 enum devlink_reload_action action, enum devlink_reload_limit limit,
 704                                 struct netlink_ext_ack *extack)
 705 {
 706         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 707
 708         if (nsim_dev->dont_allow_reload) {
 709                 /* For testing purposes, user set debugfs dont_allow_reload
 710                  * value to true. So forbid it.
 711                  */
 712                 NL_SET_ERR_MSG_MOD(extack, "User forbid the reload for testing purposes");
 713                 return -EOPNOTSUPP;
 714         }
 715
 716         nsim_dev_reload_destroy(nsim_dev);
 717         return 0;
 718 }
 719
 720 static int nsim_dev_reload_up(struct devlink *devlink, enum devlink_reload_action action,
 721                               enum devlink_reload_limit limit, u32 *actions_performed,
 722                               struct netlink_ext_ack *extack)
 723 {
 724         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 725
 726         if (nsim_dev->fail_reload) {
 727                 /* For testing purposes, user set debugfs fail_reload
 728                  * value to true. Fail right away.
 729                  */
 730                 NL_SET_ERR_MSG_MOD(extack, "User setup the reload to fail for testing purposes");
 731                 return -EINVAL;
 732         }
 733
 734         *actions_performed = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT);
 735         return nsim_dev_reload_create(nsim_dev, extack);
 736 }
 737
 738 static int nsim_dev_info_get(struct devlink *devlink,
 739                              struct devlink_info_req *req,
 740                              struct netlink_ext_ack *extack)
 741 {
 742         return devlink_info_driver_name_put(req, DRV_NAME);
 743 }
 744
 745 #define NSIM_DEV_FLASH_SIZE 500000
 746 #define NSIM_DEV_FLASH_CHUNK_SIZE 1000
 747 #define NSIM_DEV_FLASH_CHUNK_TIME_MS 10
 748
 749 static int nsim_dev_flash_update(struct devlink *devlink,
 750                                  struct devlink_flash_update_params *params,
 751                                  struct netlink_ext_ack *extack)
 752 {
 753         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 754         int i;
 755
 756         if ((params->overwrite_mask & ~nsim_dev->fw_update_overwrite_mask) != 0)
 757                 return -EOPNOTSUPP;
 758
 759         if (nsim_dev->fw_update_status) {
 760                 devlink_flash_update_begin_notify(devlink);
 761                 devlink_flash_update_status_notify(devlink,
 762                                                    "Preparing to flash",
 763                                                    params->component, 0, 0);
 764         }
 765
 766         for (i = 0; i < NSIM_DEV_FLASH_SIZE / NSIM_DEV_FLASH_CHUNK_SIZE; i++) {
 767                 if (nsim_dev->fw_update_status)
 768                         devlink_flash_update_status_notify(devlink, "Flashing",
 769                                                            params->component,
 770                                                            i * NSIM_DEV_FLASH_CHUNK_SIZE,
 771                                                            NSIM_DEV_FLASH_SIZE);
 772                 msleep(NSIM_DEV_FLASH_CHUNK_TIME_MS);
 773         }
 774
 775         if (nsim_dev->fw_update_status) {
 776                 devlink_flash_update_status_notify(devlink, "Flashing",
 777                                                    params->component,
 778                                                    NSIM_DEV_FLASH_SIZE,
 779                                                    NSIM_DEV_FLASH_SIZE);
 780                 devlink_flash_update_timeout_notify(devlink, "Flash select",
 781                                                     params->component, 81);
 782                 devlink_flash_update_status_notify(devlink, "Flashing done",
 783                                                    params->component, 0, 0);
 784                 devlink_flash_update_end_notify(devlink);
 785         }
 786
 787         return 0;
 788 }
 789
 790 static struct nsim_trap_item *
 791 nsim_dev_trap_item_lookup(struct nsim_dev *nsim_dev, u16 trap_id)
 792 {
 793         struct nsim_trap_data *nsim_trap_data = nsim_dev->trap_data;
 794         int i;
 795
 796         for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
 797                 if (nsim_traps_arr[i].id == trap_id)
 798                         return &nsim_trap_data->trap_items_arr[i];
 799         }
 800
 801         return NULL;
 802 }
 803
 804 static int nsim_dev_devlink_trap_init(struct devlink *devlink,
 805                                       const struct devlink_trap *trap,
 806                                       void *trap_ctx)
 807 {
 808         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 809         struct nsim_trap_item *nsim_trap_item;
 810
 811         nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
 812         if (WARN_ON(!nsim_trap_item))
 813                 return -ENOENT;
 814
 815         nsim_trap_item->trap_ctx = trap_ctx;
 816         nsim_trap_item->action = trap->init_action;
 817
 818         return 0;
 819 }
 820
 821 static int
 822 nsim_dev_devlink_trap_action_set(struct devlink *devlink,
 823                                  const struct devlink_trap *trap,
 824                                  enum devlink_trap_action action,
 825                                  struct netlink_ext_ack *extack)
 826 {
 827         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 828         struct nsim_trap_item *nsim_trap_item;
 829
 830         nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
 831         if (WARN_ON(!nsim_trap_item))
 832                 return -ENOENT;
 833
 834         spin_lock(&nsim_dev->trap_data->trap_lock);
 835         nsim_trap_item->action = action;
 836         spin_unlock(&nsim_dev->trap_data->trap_lock);
 837
 838         return 0;
 839 }
 840
 841 static int
 842 nsim_dev_devlink_trap_group_set(struct devlink *devlink,
 843                                 const struct devlink_trap_group *group,
 844                                 const struct devlink_trap_policer *policer,
 845                                 struct netlink_ext_ack *extack)
 846 {
 847         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 848
 849         if (nsim_dev->fail_trap_group_set)
 850                 return -EINVAL;
 851
 852         return 0;
 853 }
 854
 855 static int
 856 nsim_dev_devlink_trap_policer_set(struct devlink *devlink,
 857                                   const struct devlink_trap_policer *policer,
 858                                   u64 rate, u64 burst,
 859                                   struct netlink_ext_ack *extack)
 860 {
 861         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 862
 863         if (nsim_dev->fail_trap_policer_set) {
 864                 NL_SET_ERR_MSG_MOD(extack, "User setup the operation to fail for testing purposes");
 865                 return -EINVAL;
 866         }
 867
 868         return 0;
 869 }
 870
 871 static int
 872 nsim_dev_devlink_trap_policer_counter_get(struct devlink *devlink,
 873                                           const struct devlink_trap_policer *policer,
 874                                           u64 *p_drops)
 875 {
 876         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 877         u64 *cnt;
 878
 879         if (nsim_dev->fail_trap_policer_counter_get)
 880                 return -EINVAL;
 881
 882         cnt = &nsim_dev->trap_data->trap_policers_cnt_arr[policer->id - 1];
 883         *p_drops = (*cnt)++;
 884
 885         return 0;
 886 }
 887
 888 static const struct devlink_ops nsim_dev_devlink_ops = {
 889         .supported_flash_update_params = DEVLINK_SUPPORT_FLASH_UPDATE_COMPONENT |
 890                                          DEVLINK_SUPPORT_FLASH_UPDATE_OVERWRITE_MASK,
 891         .reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT),
 892         .reload_down = nsim_dev_reload_down,
 893         .reload_up = nsim_dev_reload_up,
 894         .info_get = nsim_dev_info_get,
 895         .flash_update = nsim_dev_flash_update,
 896         .trap_init = nsim_dev_devlink_trap_init,
 897         .trap_action_set = nsim_dev_devlink_trap_action_set,
 898         .trap_group_set = nsim_dev_devlink_trap_group_set,
 899         .trap_policer_set = nsim_dev_devlink_trap_policer_set,
 900         .trap_policer_counter_get = nsim_dev_devlink_trap_policer_counter_get,
 901 };
 902
 903 #define NSIM_DEV_MAX_MACS_DEFAULT 32
 904 #define NSIM_DEV_TEST1_DEFAULT true
 905
 906 static int __nsim_dev_port_add(struct nsim_dev *nsim_dev,
 907                                unsigned int port_index)
 908 {
 909         struct devlink_port_attrs attrs = {};
 910         struct nsim_dev_port *nsim_dev_port;
 911         struct devlink_port *devlink_port;
 912         int err;
 913
 914         nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL);
 915         if (!nsim_dev_port)
 916                 return -ENOMEM;
 917         nsim_dev_port->port_index = port_index;
 918
 919         devlink_port = &nsim_dev_port->devlink_port;
 920         attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
 921         attrs.phys.port_number = port_index + 1;
 922         memcpy(attrs.switch_id.id, nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
 923         attrs.switch_id.id_len = nsim_dev->switch_id.id_len;
 924         devlink_port_attrs_set(devlink_port, &attrs);
 925         err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port,
 926                                     port_index);
 927         if (err)
 928                 goto err_port_free;
 929
 930         err = nsim_dev_port_debugfs_init(nsim_dev, nsim_dev_port);
 931         if (err)
 932                 goto err_dl_port_unregister;
 933
 934         nsim_dev_port->ns = nsim_create(nsim_dev, nsim_dev_port);
 935         if (IS_ERR(nsim_dev_port->ns)) {
 936                 err = PTR_ERR(nsim_dev_port->ns);
 937                 goto err_port_debugfs_exit;
 938         }
 939
 940         devlink_port_type_eth_set(devlink_port, nsim_dev_port->ns->netdev);
 941         list_add(&nsim_dev_port->list, &nsim_dev->port_list);
 942
 943         return 0;
 944
 945 err_port_debugfs_exit:
 946         nsim_dev_port_debugfs_exit(nsim_dev_port);
 947 err_dl_port_unregister:
 948         devlink_port_unregister(devlink_port);
 949 err_port_free:
 950         kfree(nsim_dev_port);
 951         return err;
 952 }
 953
 954 static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port)
 955 {
 956         struct devlink_port *devlink_port = &nsim_dev_port->devlink_port;
 957
 958         list_del(&nsim_dev_port->list);
 959         devlink_port_type_clear(devlink_port);
 960         nsim_destroy(nsim_dev_port->ns);
 961         nsim_dev_port_debugfs_exit(nsim_dev_port);
 962         devlink_port_unregister(devlink_port);
 963         kfree(nsim_dev_port);
 964 }
 965
 966 static void nsim_dev_port_del_all(struct nsim_dev *nsim_dev)
 967 {
 968         struct nsim_dev_port *nsim_dev_port, *tmp;
 969
 970         mutex_lock(&nsim_dev->port_list_lock);
 971         list_for_each_entry_safe(nsim_dev_port, tmp,
 972                                  &nsim_dev->port_list, list)
 973                 __nsim_dev_port_del(nsim_dev_port);
 974         mutex_unlock(&nsim_dev->port_list_lock);
 975 }
 976
 977 static int nsim_dev_port_add_all(struct nsim_dev *nsim_dev,
 978                                  unsigned int port_count)
 979 {
 980         int i, err;
 981
 982         for (i = 0; i < port_count; i++) {
 983                 err = __nsim_dev_port_add(nsim_dev, i);
 984                 if (err)
 985                         goto err_port_del_all;
 986         }
 987         return 0;
 988
 989 err_port_del_all:
 990         nsim_dev_port_del_all(nsim_dev);
 991         return err;
 992 }
 993
 994 static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
 995                                   struct netlink_ext_ack *extack)
 996 {
 997         struct nsim_bus_dev *nsim_bus_dev = nsim_dev->nsim_bus_dev;
 998         struct devlink *devlink;
 999         int err;
1000
1001         devlink = priv_to_devlink(nsim_dev);
1002         nsim_dev = devlink_priv(devlink);
1003         INIT_LIST_HEAD(&nsim_dev->port_list);
1004         mutex_init(&nsim_dev->port_list_lock);
1005         nsim_dev->fw_update_status = true;
1006         nsim_dev->fw_update_overwrite_mask = 0;
1007
1008         nsim_devlink_param_load_driverinit_values(devlink);
1009
1010         err = nsim_dev_dummy_region_init(nsim_dev, devlink);
1011         if (err)
1012                 return err;
1013
1014         err = nsim_dev_traps_init(devlink);
1015         if (err)
1016                 goto err_dummy_region_exit;
1017
1018         nsim_dev->fib_data = nsim_fib_create(devlink, extack);
1019         if (IS_ERR(nsim_dev->fib_data)) {
1020                 err = PTR_ERR(nsim_dev->fib_data);
1021                 goto err_traps_exit;
1022         }
1023
1024         err = nsim_dev_health_init(nsim_dev, devlink);
1025         if (err)
1026                 goto err_fib_destroy;
1027
1028         err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
1029         if (err)
1030                 goto err_health_exit;
1031
1032         nsim_dev->take_snapshot = debugfs_create_file("take_snapshot",
1033                                                       0200,
1034                                                       nsim_dev->ddir,
1035                                                       nsim_dev,
1036                                                 &nsim_dev_take_snapshot_fops);
1037         return 0;
1038
1039 err_health_exit:
1040         nsim_dev_health_exit(nsim_dev);
1041 err_fib_destroy:
1042         nsim_fib_destroy(devlink, nsim_dev->fib_data);
1043 err_traps_exit:
1044         nsim_dev_traps_exit(devlink);
1045 err_dummy_region_exit:
1046         nsim_dev_dummy_region_exit(nsim_dev);
1047         return err;
1048 }
1049
1050 int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
1051 {
1052         struct nsim_dev *nsim_dev;
1053         struct devlink *devlink;
1054         int err;
1055
1056         devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
1057         if (!devlink)
1058                 return -ENOMEM;
1059         devlink_net_set(devlink, nsim_bus_dev->initial_net);
1060         nsim_dev = devlink_priv(devlink);
1061         nsim_dev->nsim_bus_dev = nsim_bus_dev;
1062         nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
1063         get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
1064         INIT_LIST_HEAD(&nsim_dev->port_list);
1065         mutex_init(&nsim_dev->port_list_lock);
1066         nsim_dev->fw_update_status = true;
1067         nsim_dev->fw_update_overwrite_mask = 0;
1068         nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
1069         nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT;
1070         spin_lock_init(&nsim_dev->fa_cookie_lock);
1071
1072         dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
1073
1074         err = nsim_dev_resources_register(devlink);
1075         if (err)
1076                 goto err_devlink_free;
1077
1078         err = devlink_register(devlink, &nsim_bus_dev->dev);
1079         if (err)
1080                 goto err_resources_unregister;
1081
1082         err = devlink_params_register(devlink, nsim_devlink_params,
1083                                       ARRAY_SIZE(nsim_devlink_params));
1084         if (err)
1085                 goto err_dl_unregister;
1086         nsim_devlink_set_params_init_values(nsim_dev, devlink);
1087
1088         err = nsim_dev_dummy_region_init(nsim_dev, devlink);
1089         if (err)
1090                 goto err_params_unregister;
1091
1092         err = nsim_dev_traps_init(devlink);
1093         if (err)
1094                 goto err_dummy_region_exit;
1095
1096         err = nsim_dev_debugfs_init(nsim_dev);
1097         if (err)
1098                 goto err_traps_exit;
1099
1100         nsim_dev->fib_data = nsim_fib_create(devlink, NULL);
1101         if (IS_ERR(nsim_dev->fib_data)) {
1102                 err = PTR_ERR(nsim_dev->fib_data);
1103                 goto err_debugfs_exit;
1104         }
1105
1106         err = nsim_dev_health_init(nsim_dev, devlink);
1107         if (err)
1108                 goto err_fib_destroy;
1109
1110         err = nsim_bpf_dev_init(nsim_dev);
1111         if (err)
1112                 goto err_health_exit;
1113
1114         err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
1115         if (err)
1116                 goto err_bpf_dev_exit;
1117
1118         devlink_params_publish(devlink);
1119         devlink_reload_enable(devlink);
1120         return 0;
1121
1122 err_bpf_dev_exit:
1123         nsim_bpf_dev_exit(nsim_dev);
1124 err_health_exit:
1125         nsim_dev_health_exit(nsim_dev);
1126 err_fib_destroy:
1127         nsim_fib_destroy(devlink, nsim_dev->fib_data);
1128 err_debugfs_exit:
1129         nsim_dev_debugfs_exit(nsim_dev);
1130 err_traps_exit:
1131         nsim_dev_traps_exit(devlink);
1132 err_dummy_region_exit:
1133         nsim_dev_dummy_region_exit(nsim_dev);
1134 err_params_unregister:
1135         devlink_params_unregister(devlink, nsim_devlink_params,
1136                                   ARRAY_SIZE(nsim_devlink_params));
1137 err_dl_unregister:
1138         devlink_unregister(devlink);
1139 err_resources_unregister:
1140         devlink_resources_unregister(devlink, NULL);
1141 err_devlink_free:
1142         devlink_free(devlink);
1143         return err;
1144 }
1145
1146 static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
1147 {
1148         struct devlink *devlink = priv_to_devlink(nsim_dev);
1149
1150         if (devlink_is_reload_failed(devlink))
1151                 return;
1152         debugfs_remove(nsim_dev->take_snapshot);
1153         nsim_dev_port_del_all(nsim_dev);
1154         nsim_dev_health_exit(nsim_dev);
1155         nsim_fib_destroy(devlink, nsim_dev->fib_data);
1156         nsim_dev_traps_exit(devlink);
1157         nsim_dev_dummy_region_exit(nsim_dev);
1158         mutex_destroy(&nsim_dev->port_list_lock);
1159 }
1160
1161 void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
1162 {
1163         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
1164         struct devlink *devlink = priv_to_devlink(nsim_dev);
1165
1166         devlink_reload_disable(devlink);
1167
1168         nsim_dev_reload_destroy(nsim_dev);
1169
1170         nsim_bpf_dev_exit(nsim_dev);
1171         nsim_dev_debugfs_exit(nsim_dev);
1172         devlink_params_unregister(devlink, nsim_devlink_params,
1173                                   ARRAY_SIZE(nsim_devlink_params));
1174         devlink_unregister(devlink);
1175         devlink_resources_unregister(devlink, NULL);
1176         devlink_free(devlink);
1177 }
1178
1179 static struct nsim_dev_port *
1180 __nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index)
1181 {
1182         struct nsim_dev_port *nsim_dev_port;
1183
1184         list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list)
1185                 if (nsim_dev_port->port_index == port_index)
1186                         return nsim_dev_port;
1187         return NULL;
1188 }
1189
1190 int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
1191                       unsigned int port_index)
1192 {
1193         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
1194         int err;
1195
1196         mutex_lock(&nsim_dev->port_list_lock);
1197         if (__nsim_dev_port_lookup(nsim_dev, port_index))
1198                 err = -EEXIST;
1199         else
1200                 err = __nsim_dev_port_add(nsim_dev, port_index);
1201         mutex_unlock(&nsim_dev->port_list_lock);
1202         return err;
1203 }
1204
1205 int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
1206                       unsigned int port_index)
1207 {
1208         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
1209         struct nsim_dev_port *nsim_dev_port;
1210         int err = 0;
1211
1212         mutex_lock(&nsim_dev->port_list_lock);
1213         nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, port_index);
1214         if (!nsim_dev_port)
1215                 err = -ENOENT;
1216         else
1217                 __nsim_dev_port_del(nsim_dev_port);
1218         mutex_unlock(&nsim_dev->port_list_lock);
1219         return err;
1220 }
1221
1222 int nsim_dev_init(void)
1223 {
1224         nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL);
1225         return PTR_ERR_OR_ZERO(nsim_dev_ddir);
1226 }
1227
1228 void nsim_dev_exit(void)
1229 {
1230         debugfs_remove_recursive(nsim_dev_ddir);
1231 }