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         buf = kmalloc(count, GFP_KERNEL | __GFP_NOWARN);
 153         if (!buf)
 154                 return -ENOMEM;
 155
 156         ret = simple_write_to_buffer(buf, count, ppos, data, count);
 157         if (ret < 0)
 158                 goto free_buf;
 159
 160         fa_cookie = kmalloc(sizeof(*fa_cookie) + cookie_len,
 161                             GFP_KERNEL | __GFP_NOWARN);
 162         if (!fa_cookie) {
 163                 ret = -ENOMEM;
 164                 goto free_buf;
 165         }
 166
 167         fa_cookie->cookie_len = cookie_len;
 168         ret = hex2bin(fa_cookie->cookie, buf, cookie_len);
 169         if (ret)
 170                 goto free_fa_cookie;
 171         kfree(buf);
 172
 173         spin_lock(&nsim_dev->fa_cookie_lock);
 174         kfree(nsim_dev->fa_cookie);
 175         nsim_dev->fa_cookie = fa_cookie;
 176         spin_unlock(&nsim_dev->fa_cookie_lock);
 177
 178         return count;
 179
 180 free_fa_cookie:
 181         kfree(fa_cookie);
 182 free_buf:
 183         kfree(buf);
 184         return ret;
 185 }
 186
 187 static const struct file_operations nsim_dev_trap_fa_cookie_fops = {
 188         .open = simple_open,
 189         .read = nsim_dev_trap_fa_cookie_read,
 190         .write = nsim_dev_trap_fa_cookie_write,
 191         .llseek = generic_file_llseek,
 192         .owner = THIS_MODULE,
 193 };
 194
 195 static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
 196 {
 197         char dev_ddir_name[sizeof(DRV_NAME) + 10];
 198
 199         sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id);
 200         nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir);
 201         if (IS_ERR(nsim_dev->ddir))
 202                 return PTR_ERR(nsim_dev->ddir);
 203         nsim_dev->ports_ddir = debugfs_create_dir("ports", nsim_dev->ddir);
 204         if (IS_ERR(nsim_dev->ports_ddir))
 205                 return PTR_ERR(nsim_dev->ports_ddir);
 206         debugfs_create_bool("fw_update_status", 0600, nsim_dev->ddir,
 207                             &nsim_dev->fw_update_status);
 208         debugfs_create_u32("fw_update_overwrite_mask", 0600, nsim_dev->ddir,
 209                             &nsim_dev->fw_update_overwrite_mask);
 210         debugfs_create_u32("max_macs", 0600, nsim_dev->ddir,
 211                            &nsim_dev->max_macs);
 212         debugfs_create_bool("test1", 0600, nsim_dev->ddir,
 213                             &nsim_dev->test1);
 214         nsim_dev->take_snapshot = debugfs_create_file("take_snapshot",
 215                                                       0200,
 216                                                       nsim_dev->ddir,
 217                                                       nsim_dev,
 218                                                 &nsim_dev_take_snapshot_fops);
 219         debugfs_create_bool("dont_allow_reload", 0600, nsim_dev->ddir,
 220                             &nsim_dev->dont_allow_reload);
 221         debugfs_create_bool("fail_reload", 0600, nsim_dev->ddir,
 222                             &nsim_dev->fail_reload);
 223         debugfs_create_file("trap_flow_action_cookie", 0600, nsim_dev->ddir,
 224                             nsim_dev, &nsim_dev_trap_fa_cookie_fops);
 225         debugfs_create_bool("fail_trap_group_set", 0600,
 226                             nsim_dev->ddir,
 227                             &nsim_dev->fail_trap_group_set);
 228         debugfs_create_bool("fail_trap_policer_set", 0600,
 229                             nsim_dev->ddir,
 230                             &nsim_dev->fail_trap_policer_set);
 231         debugfs_create_bool("fail_trap_policer_counter_get", 0600,
 232                             nsim_dev->ddir,
 233                             &nsim_dev->fail_trap_policer_counter_get);
 234         nsim_udp_tunnels_debugfs_create(nsim_dev);
 235         return 0;
 236 }
 237
 238 static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
 239 {
 240         debugfs_remove_recursive(nsim_dev->ports_ddir);
 241         debugfs_remove_recursive(nsim_dev->ddir);
 242 }
 243
 244 static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
 245                                       struct nsim_dev_port *nsim_dev_port)
 246 {
 247         char port_ddir_name[16];
 248         char dev_link_name[32];
 249
 250         sprintf(port_ddir_name, "%u", nsim_dev_port->port_index);
 251         nsim_dev_port->ddir = debugfs_create_dir(port_ddir_name,
 252                                                  nsim_dev->ports_ddir);
 253         if (IS_ERR(nsim_dev_port->ddir))
 254                 return PTR_ERR(nsim_dev_port->ddir);
 255
 256         sprintf(dev_link_name, "../../../" DRV_NAME "%u",
 257                 nsim_dev->nsim_bus_dev->dev.id);
 258         debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name);
 259
 260         return 0;
 261 }
 262
 263 static void nsim_dev_port_debugfs_exit(struct nsim_dev_port *nsim_dev_port)
 264 {
 265         debugfs_remove_recursive(nsim_dev_port->ddir);
 266 }
 267
 268 static int nsim_dev_resources_register(struct devlink *devlink)
 269 {
 270         struct devlink_resource_size_params params = {
 271                 .size_max = (u64)-1,
 272                 .size_granularity = 1,
 273                 .unit = DEVLINK_RESOURCE_UNIT_ENTRY
 274         };
 275         int err;
 276
 277         /* Resources for IPv4 */
 278         err = devlink_resource_register(devlink, "IPv4", (u64)-1,
 279                                         NSIM_RESOURCE_IPV4,
 280                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 281                                         &params);
 282         if (err) {
 283                 pr_err("Failed to register IPv4 top resource\n");
 284                 goto out;
 285         }
 286
 287         err = devlink_resource_register(devlink, "fib", (u64)-1,
 288                                         NSIM_RESOURCE_IPV4_FIB,
 289                                         NSIM_RESOURCE_IPV4, &params);
 290         if (err) {
 291                 pr_err("Failed to register IPv4 FIB resource\n");
 292                 return err;
 293         }
 294
 295         err = devlink_resource_register(devlink, "fib-rules", (u64)-1,
 296                                         NSIM_RESOURCE_IPV4_FIB_RULES,
 297                                         NSIM_RESOURCE_IPV4, &params);
 298         if (err) {
 299                 pr_err("Failed to register IPv4 FIB rules resource\n");
 300                 return err;
 301         }
 302
 303         /* Resources for IPv6 */
 304         err = devlink_resource_register(devlink, "IPv6", (u64)-1,
 305                                         NSIM_RESOURCE_IPV6,
 306                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 307                                         &params);
 308         if (err) {
 309                 pr_err("Failed to register IPv6 top resource\n");
 310                 goto out;
 311         }
 312
 313         err = devlink_resource_register(devlink, "fib", (u64)-1,
 314                                         NSIM_RESOURCE_IPV6_FIB,
 315                                         NSIM_RESOURCE_IPV6, &params);
 316         if (err) {
 317                 pr_err("Failed to register IPv6 FIB resource\n");
 318                 return err;
 319         }
 320
 321         err = devlink_resource_register(devlink, "fib-rules", (u64)-1,
 322                                         NSIM_RESOURCE_IPV6_FIB_RULES,
 323                                         NSIM_RESOURCE_IPV6, &params);
 324         if (err) {
 325                 pr_err("Failed to register IPv6 FIB rules resource\n");
 326                 return err;
 327         }
 328
 329         /* Resources for nexthops */
 330         err = devlink_resource_register(devlink, "nexthops", (u64)-1,
 331                                         NSIM_RESOURCE_NEXTHOPS,
 332                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 333                                         &params);
 334
 335 out:
 336         return err;
 337 }
 338
 339 enum nsim_devlink_param_id {
 340         NSIM_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
 341         NSIM_DEVLINK_PARAM_ID_TEST1,
 342 };
 343
 344 static const struct devlink_param nsim_devlink_params[] = {
 345         DEVLINK_PARAM_GENERIC(MAX_MACS,
 346                               BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 347                               NULL, NULL, NULL),
 348         DEVLINK_PARAM_DRIVER(NSIM_DEVLINK_PARAM_ID_TEST1,
 349                              "test1", DEVLINK_PARAM_TYPE_BOOL,
 350                              BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 351                              NULL, NULL, NULL),
 352 };
 353
 354 static void nsim_devlink_set_params_init_values(struct nsim_dev *nsim_dev,
 355                                                 struct devlink *devlink)
 356 {
 357         union devlink_param_value value;
 358
 359         value.vu32 = nsim_dev->max_macs;
 360         devlink_param_driverinit_value_set(devlink,
 361                                            DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
 362                                            value);
 363         value.vbool = nsim_dev->test1;
 364         devlink_param_driverinit_value_set(devlink,
 365                                            NSIM_DEVLINK_PARAM_ID_TEST1,
 366                                            value);
 367 }
 368
 369 static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink)
 370 {
 371         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 372         union devlink_param_value saved_value;
 373         int err;
 374
 375         err = devlink_param_driverinit_value_get(devlink,
 376                                                  DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
 377                                                  &saved_value);
 378         if (!err)
 379                 nsim_dev->max_macs = saved_value.vu32;
 380         err = devlink_param_driverinit_value_get(devlink,
 381                                                  NSIM_DEVLINK_PARAM_ID_TEST1,
 382                                                  &saved_value);
 383         if (!err)
 384                 nsim_dev->test1 = saved_value.vbool;
 385 }
 386
 387 #define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16
 388
 389 static const struct devlink_region_ops dummy_region_ops = {
 390         .name = "dummy",
 391         .destructor = &kfree,
 392         .snapshot = nsim_dev_take_snapshot,
 393 };
 394
 395 static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,
 396                                       struct devlink *devlink)
 397 {
 398         nsim_dev->dummy_region =
 399                 devlink_region_create(devlink, &dummy_region_ops,
 400                                       NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX,
 401                                       NSIM_DEV_DUMMY_REGION_SIZE);
 402         return PTR_ERR_OR_ZERO(nsim_dev->dummy_region);
 403 }
 404
 405 static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev)
 406 {
 407         devlink_region_destroy(nsim_dev->dummy_region);
 408 }
 409
 410 struct nsim_trap_item {
 411         void *trap_ctx;
 412         enum devlink_trap_action action;
 413 };
 414
 415 struct nsim_trap_data {
 416         struct delayed_work trap_report_dw;
 417         struct nsim_trap_item *trap_items_arr;
 418         u64 *trap_policers_cnt_arr;
 419         struct nsim_dev *nsim_dev;
 420         spinlock_t trap_lock;   /* Protects trap_items_arr */
 421 };
 422
 423 /* All driver-specific traps must be documented in
 424  * Documentation/networking/devlink/netdevsim.rst
 425  */
 426 enum {
 427         NSIM_TRAP_ID_BASE = DEVLINK_TRAP_GENERIC_ID_MAX,
 428         NSIM_TRAP_ID_FID_MISS,
 429 };
 430
 431 #define NSIM_TRAP_NAME_FID_MISS "fid_miss"
 432
 433 #define NSIM_TRAP_METADATA DEVLINK_TRAP_METADATA_TYPE_F_IN_PORT
 434
 435 #define NSIM_TRAP_DROP(_id, _group_id)                                        \
 436         DEVLINK_TRAP_GENERIC(DROP, DROP, _id,                                 \
 437                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 438                              NSIM_TRAP_METADATA)
 439 #define NSIM_TRAP_DROP_EXT(_id, _group_id, _metadata)                         \
 440         DEVLINK_TRAP_GENERIC(DROP, DROP, _id,                                 \
 441                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 442                              NSIM_TRAP_METADATA | (_metadata))
 443 #define NSIM_TRAP_EXCEPTION(_id, _group_id)                                   \
 444         DEVLINK_TRAP_GENERIC(EXCEPTION, TRAP, _id,                            \
 445                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 446                              NSIM_TRAP_METADATA)
 447 #define NSIM_TRAP_CONTROL(_id, _group_id, _action)                            \
 448         DEVLINK_TRAP_GENERIC(CONTROL, _action, _id,                           \
 449                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 450                              NSIM_TRAP_METADATA)
 451 #define NSIM_TRAP_DRIVER_EXCEPTION(_id, _group_id)                            \
 452         DEVLINK_TRAP_DRIVER(EXCEPTION, TRAP, NSIM_TRAP_ID_##_id,              \
 453                             NSIM_TRAP_NAME_##_id,                             \
 454                             DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,        \
 455                             NSIM_TRAP_METADATA)
 456
 457 #define NSIM_DEV_TRAP_POLICER_MIN_RATE  1
 458 #define NSIM_DEV_TRAP_POLICER_MAX_RATE  8000
 459 #define NSIM_DEV_TRAP_POLICER_MIN_BURST 8
 460 #define NSIM_DEV_TRAP_POLICER_MAX_BURST 65536
 461
 462 #define NSIM_TRAP_POLICER(_id, _rate, _burst)                                 \
 463         DEVLINK_TRAP_POLICER(_id, _rate, _burst,                              \
 464                              NSIM_DEV_TRAP_POLICER_MAX_RATE,                  \
 465                              NSIM_DEV_TRAP_POLICER_MIN_RATE,                  \
 466                              NSIM_DEV_TRAP_POLICER_MAX_BURST,                 \
 467                              NSIM_DEV_TRAP_POLICER_MIN_BURST)
 468
 469 static const struct devlink_trap_policer nsim_trap_policers_arr[] = {
 470         NSIM_TRAP_POLICER(1, 1000, 128),
 471         NSIM_TRAP_POLICER(2, 2000, 256),
 472         NSIM_TRAP_POLICER(3, 3000, 512),
 473 };
 474
 475 static const struct devlink_trap_group nsim_trap_groups_arr[] = {
 476         DEVLINK_TRAP_GROUP_GENERIC(L2_DROPS, 0),
 477         DEVLINK_TRAP_GROUP_GENERIC(L3_DROPS, 1),
 478         DEVLINK_TRAP_GROUP_GENERIC(L3_EXCEPTIONS, 1),
 479         DEVLINK_TRAP_GROUP_GENERIC(BUFFER_DROPS, 2),
 480         DEVLINK_TRAP_GROUP_GENERIC(ACL_DROPS, 3),
 481         DEVLINK_TRAP_GROUP_GENERIC(MC_SNOOPING, 3),
 482 };
 483
 484 static const struct devlink_trap nsim_traps_arr[] = {
 485         NSIM_TRAP_DROP(SMAC_MC, L2_DROPS),
 486         NSIM_TRAP_DROP(VLAN_TAG_MISMATCH, L2_DROPS),
 487         NSIM_TRAP_DROP(INGRESS_VLAN_FILTER, L2_DROPS),
 488         NSIM_TRAP_DROP(INGRESS_STP_FILTER, L2_DROPS),
 489         NSIM_TRAP_DROP(EMPTY_TX_LIST, L2_DROPS),
 490         NSIM_TRAP_DROP(PORT_LOOPBACK_FILTER, L2_DROPS),
 491         NSIM_TRAP_DRIVER_EXCEPTION(FID_MISS, L2_DROPS),
 492         NSIM_TRAP_DROP(BLACKHOLE_ROUTE, L3_DROPS),
 493         NSIM_TRAP_EXCEPTION(TTL_ERROR, L3_EXCEPTIONS),
 494         NSIM_TRAP_DROP(TAIL_DROP, BUFFER_DROPS),
 495         NSIM_TRAP_DROP_EXT(INGRESS_FLOW_ACTION_DROP, ACL_DROPS,
 496                            DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE),
 497         NSIM_TRAP_DROP_EXT(EGRESS_FLOW_ACTION_DROP, ACL_DROPS,
 498                            DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE),
 499         NSIM_TRAP_CONTROL(IGMP_QUERY, MC_SNOOPING, MIRROR),
 500         NSIM_TRAP_CONTROL(IGMP_V1_REPORT, MC_SNOOPING, TRAP),
 501 };
 502
 503 #define NSIM_TRAP_L4_DATA_LEN 100
 504
 505 static struct sk_buff *nsim_dev_trap_skb_build(void)
 506 {
 507         int tot_len, data_len = NSIM_TRAP_L4_DATA_LEN;
 508         struct sk_buff *skb;
 509         struct udphdr *udph;
 510         struct ethhdr *eth;
 511         struct iphdr *iph;
 512
 513         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 514         if (!skb)
 515                 return NULL;
 516         tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + data_len;
 517
 518         skb_reset_mac_header(skb);
 519         eth = skb_put(skb, sizeof(struct ethhdr));
 520         eth_random_addr(eth->h_dest);
 521         eth_random_addr(eth->h_source);
 522         eth->h_proto = htons(ETH_P_IP);
 523         skb->protocol = htons(ETH_P_IP);
 524
 525         skb_set_network_header(skb, skb->len);
 526         iph = skb_put(skb, sizeof(struct iphdr));
 527         iph->protocol = IPPROTO_UDP;
 528         iph->saddr = in_aton("192.0.2.1");
 529         iph->daddr = in_aton("198.51.100.1");
 530         iph->version = 0x4;
 531         iph->frag_off = 0;
 532         iph->ihl = 0x5;
 533         iph->tot_len = htons(tot_len);
 534         iph->ttl = 100;
 535         iph->check = 0;
 536         iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 537
 538         skb_set_transport_header(skb, skb->len);
 539         udph = skb_put_zero(skb, sizeof(struct udphdr) + data_len);
 540         get_random_bytes(&udph->source, sizeof(u16));
 541         get_random_bytes(&udph->dest, sizeof(u16));
 542         udph->len = htons(sizeof(struct udphdr) + data_len);
 543
 544         return skb;
 545 }
 546
 547 static void nsim_dev_trap_report(struct nsim_dev_port *nsim_dev_port)
 548 {
 549         struct nsim_dev *nsim_dev = nsim_dev_port->ns->nsim_dev;
 550         struct devlink *devlink = priv_to_devlink(nsim_dev);
 551         struct nsim_trap_data *nsim_trap_data;
 552         int i;
 553
 554         nsim_trap_data = nsim_dev->trap_data;
 555
 556         spin_lock(&nsim_trap_data->trap_lock);
 557         for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
 558                 struct flow_action_cookie *fa_cookie = NULL;
 559                 struct nsim_trap_item *nsim_trap_item;
 560                 struct sk_buff *skb;
 561                 bool has_fa_cookie;
 562
 563                 has_fa_cookie = nsim_traps_arr[i].metadata_cap &
 564                                 DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE;
 565
 566                 nsim_trap_item = &nsim_trap_data->trap_items_arr[i];
 567                 if (nsim_trap_item->action == DEVLINK_TRAP_ACTION_DROP)
 568                         continue;
 569
 570                 skb = nsim_dev_trap_skb_build();
 571                 if (!skb)
 572                         continue;
 573                 skb->dev = nsim_dev_port->ns->netdev;
 574
 575                 /* Trapped packets are usually passed to devlink in softIRQ,
 576                  * but in this case they are generated in a workqueue. Disable
 577                  * softIRQs to prevent lockdep from complaining about
 578                  * "incosistent lock state".
 579                  */
 580
 581                 spin_lock_bh(&nsim_dev->fa_cookie_lock);
 582                 fa_cookie = has_fa_cookie ? nsim_dev->fa_cookie : NULL;
 583                 devlink_trap_report(devlink, skb, nsim_trap_item->trap_ctx,
 584                                     &nsim_dev_port->devlink_port, fa_cookie);
 585                 spin_unlock_bh(&nsim_dev->fa_cookie_lock);
 586                 consume_skb(skb);
 587         }
 588         spin_unlock(&nsim_trap_data->trap_lock);
 589 }
 590
 591 #define NSIM_TRAP_REPORT_INTERVAL_MS    100
 592
 593 static void nsim_dev_trap_report_work(struct work_struct *work)
 594 {
 595         struct nsim_trap_data *nsim_trap_data;
 596         struct nsim_dev_port *nsim_dev_port;
 597         struct nsim_dev *nsim_dev;
 598
 599         nsim_trap_data = container_of(work, struct nsim_trap_data,
 600                                       trap_report_dw.work);
 601         nsim_dev = nsim_trap_data->nsim_dev;
 602
 603         /* For each running port and enabled packet trap, generate a UDP
 604          * packet with a random 5-tuple and report it.
 605          */
 606         mutex_lock(&nsim_dev->port_list_lock);
 607         list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list) {
 608                 if (!netif_running(nsim_dev_port->ns->netdev))
 609                         continue;
 610
 611                 nsim_dev_trap_report(nsim_dev_port);
 612         }
 613         mutex_unlock(&nsim_dev->port_list_lock);
 614
 615         schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
 616                               msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));
 617 }
 618
 619 static int nsim_dev_traps_init(struct devlink *devlink)
 620 {
 621         size_t policers_count = ARRAY_SIZE(nsim_trap_policers_arr);
 622         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 623         struct nsim_trap_data *nsim_trap_data;
 624         int err;
 625
 626         nsim_trap_data = kzalloc(sizeof(*nsim_trap_data), GFP_KERNEL);
 627         if (!nsim_trap_data)
 628                 return -ENOMEM;
 629
 630         nsim_trap_data->trap_items_arr = kcalloc(ARRAY_SIZE(nsim_traps_arr),
 631                                                  sizeof(struct nsim_trap_item),
 632                                                  GFP_KERNEL);
 633         if (!nsim_trap_data->trap_items_arr) {
 634                 err = -ENOMEM;
 635                 goto err_trap_data_free;
 636         }
 637
 638         nsim_trap_data->trap_policers_cnt_arr = kcalloc(policers_count,
 639                                                         sizeof(u64),
 640                                                         GFP_KERNEL);
 641         if (!nsim_trap_data->trap_policers_cnt_arr) {
 642                 err = -ENOMEM;
 643                 goto err_trap_items_free;
 644         }
 645
 646         /* The lock is used to protect the action state of the registered
 647          * traps. The value is written by user and read in delayed work when
 648          * iterating over all the traps.
 649          */
 650         spin_lock_init(&nsim_trap_data->trap_lock);
 651         nsim_trap_data->nsim_dev = nsim_dev;
 652         nsim_dev->trap_data = nsim_trap_data;
 653
 654         err = devlink_trap_policers_register(devlink, nsim_trap_policers_arr,
 655                                              policers_count);
 656         if (err)
 657                 goto err_trap_policers_cnt_free;
 658
 659         err = devlink_trap_groups_register(devlink, nsim_trap_groups_arr,
 660                                            ARRAY_SIZE(nsim_trap_groups_arr));
 661         if (err)
 662                 goto err_trap_policers_unregister;
 663
 664         err = devlink_traps_register(devlink, nsim_traps_arr,
 665                                      ARRAY_SIZE(nsim_traps_arr), NULL);
 666         if (err)
 667                 goto err_trap_groups_unregister;
 668
 669         INIT_DELAYED_WORK(&nsim_dev->trap_data->trap_report_dw,
 670                           nsim_dev_trap_report_work);
 671         schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
 672                               msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));
 673
 674         return 0;
 675
 676 err_trap_groups_unregister:
 677         devlink_trap_groups_unregister(devlink, nsim_trap_groups_arr,
 678                                        ARRAY_SIZE(nsim_trap_groups_arr));
 679 err_trap_policers_unregister:
 680         devlink_trap_policers_unregister(devlink, nsim_trap_policers_arr,
 681                                          ARRAY_SIZE(nsim_trap_policers_arr));
 682 err_trap_policers_cnt_free:
 683         kfree(nsim_trap_data->trap_policers_cnt_arr);
 684 err_trap_items_free:
 685         kfree(nsim_trap_data->trap_items_arr);
 686 err_trap_data_free:
 687         kfree(nsim_trap_data);
 688         return err;
 689 }
 690
 691 static void nsim_dev_traps_exit(struct devlink *devlink)
 692 {
 693         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 694
 695         cancel_delayed_work_sync(&nsim_dev->trap_data->trap_report_dw);
 696         devlink_traps_unregister(devlink, nsim_traps_arr,
 697                                  ARRAY_SIZE(nsim_traps_arr));
 698         devlink_trap_groups_unregister(devlink, nsim_trap_groups_arr,
 699                                        ARRAY_SIZE(nsim_trap_groups_arr));
 700         devlink_trap_policers_unregister(devlink, nsim_trap_policers_arr,
 701                                          ARRAY_SIZE(nsim_trap_policers_arr));
 702         kfree(nsim_dev->trap_data->trap_policers_cnt_arr);
 703         kfree(nsim_dev->trap_data->trap_items_arr);
 704         kfree(nsim_dev->trap_data);
 705 }
 706
 707 static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
 708                                   struct netlink_ext_ack *extack);
 709 static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev);
 710
 711 static int nsim_dev_reload_down(struct devlink *devlink, bool netns_change,
 712                                 enum devlink_reload_action action, enum devlink_reload_limit limit,
 713                                 struct netlink_ext_ack *extack)
 714 {
 715         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 716
 717         if (nsim_dev->dont_allow_reload) {
 718                 /* For testing purposes, user set debugfs dont_allow_reload
 719                  * value to true. So forbid it.
 720                  */
 721                 NL_SET_ERR_MSG_MOD(extack, "User forbid the reload for testing purposes");
 722                 return -EOPNOTSUPP;
 723         }
 724
 725         nsim_dev_reload_destroy(nsim_dev);
 726         return 0;
 727 }
 728
 729 static int nsim_dev_reload_up(struct devlink *devlink, enum devlink_reload_action action,
 730                               enum devlink_reload_limit limit, u32 *actions_performed,
 731                               struct netlink_ext_ack *extack)
 732 {
 733         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 734
 735         if (nsim_dev->fail_reload) {
 736                 /* For testing purposes, user set debugfs fail_reload
 737                  * value to true. Fail right away.
 738                  */
 739                 NL_SET_ERR_MSG_MOD(extack, "User setup the reload to fail for testing purposes");
 740                 return -EINVAL;
 741         }
 742
 743         *actions_performed = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT);
 744         return nsim_dev_reload_create(nsim_dev, extack);
 745 }
 746
 747 static int nsim_dev_info_get(struct devlink *devlink,
 748                              struct devlink_info_req *req,
 749                              struct netlink_ext_ack *extack)
 750 {
 751         return devlink_info_driver_name_put(req, DRV_NAME);
 752 }
 753
 754 #define NSIM_DEV_FLASH_SIZE 500000
 755 #define NSIM_DEV_FLASH_CHUNK_SIZE 1000
 756 #define NSIM_DEV_FLASH_CHUNK_TIME_MS 10
 757
 758 static int nsim_dev_flash_update(struct devlink *devlink,
 759                                  struct devlink_flash_update_params *params,
 760                                  struct netlink_ext_ack *extack)
 761 {
 762         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 763         int i;
 764
 765         if ((params->overwrite_mask & ~nsim_dev->fw_update_overwrite_mask) != 0)
 766                 return -EOPNOTSUPP;
 767
 768         if (nsim_dev->fw_update_status) {
 769                 devlink_flash_update_status_notify(devlink,
 770                                                    "Preparing to flash",
 771                                                    params->component, 0, 0);
 772         }
 773
 774         for (i = 0; i < NSIM_DEV_FLASH_SIZE / NSIM_DEV_FLASH_CHUNK_SIZE; i++) {
 775                 if (nsim_dev->fw_update_status)
 776                         devlink_flash_update_status_notify(devlink, "Flashing",
 777                                                            params->component,
 778                                                            i * NSIM_DEV_FLASH_CHUNK_SIZE,
 779                                                            NSIM_DEV_FLASH_SIZE);
 780                 msleep(NSIM_DEV_FLASH_CHUNK_TIME_MS);
 781         }
 782
 783         if (nsim_dev->fw_update_status) {
 784                 devlink_flash_update_status_notify(devlink, "Flashing",
 785                                                    params->component,
 786                                                    NSIM_DEV_FLASH_SIZE,
 787                                                    NSIM_DEV_FLASH_SIZE);
 788                 devlink_flash_update_timeout_notify(devlink, "Flash select",
 789                                                     params->component, 81);
 790                 devlink_flash_update_status_notify(devlink, "Flashing done",
 791                                                    params->component, 0, 0);
 792         }
 793
 794         return 0;
 795 }
 796
 797 static struct nsim_trap_item *
 798 nsim_dev_trap_item_lookup(struct nsim_dev *nsim_dev, u16 trap_id)
 799 {
 800         struct nsim_trap_data *nsim_trap_data = nsim_dev->trap_data;
 801         int i;
 802
 803         for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
 804                 if (nsim_traps_arr[i].id == trap_id)
 805                         return &nsim_trap_data->trap_items_arr[i];
 806         }
 807
 808         return NULL;
 809 }
 810
 811 static int nsim_dev_devlink_trap_init(struct devlink *devlink,
 812                                       const struct devlink_trap *trap,
 813                                       void *trap_ctx)
 814 {
 815         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 816         struct nsim_trap_item *nsim_trap_item;
 817
 818         nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
 819         if (WARN_ON(!nsim_trap_item))
 820                 return -ENOENT;
 821
 822         nsim_trap_item->trap_ctx = trap_ctx;
 823         nsim_trap_item->action = trap->init_action;
 824
 825         return 0;
 826 }
 827
 828 static int
 829 nsim_dev_devlink_trap_action_set(struct devlink *devlink,
 830                                  const struct devlink_trap *trap,
 831                                  enum devlink_trap_action action,
 832                                  struct netlink_ext_ack *extack)
 833 {
 834         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 835         struct nsim_trap_item *nsim_trap_item;
 836
 837         nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
 838         if (WARN_ON(!nsim_trap_item))
 839                 return -ENOENT;
 840
 841         spin_lock(&nsim_dev->trap_data->trap_lock);
 842         nsim_trap_item->action = action;
 843         spin_unlock(&nsim_dev->trap_data->trap_lock);
 844
 845         return 0;
 846 }
 847
 848 static int
 849 nsim_dev_devlink_trap_group_set(struct devlink *devlink,
 850                                 const struct devlink_trap_group *group,
 851                                 const struct devlink_trap_policer *policer,
 852                                 struct netlink_ext_ack *extack)
 853 {
 854         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 855
 856         if (nsim_dev->fail_trap_group_set)
 857                 return -EINVAL;
 858
 859         return 0;
 860 }
 861
 862 static int
 863 nsim_dev_devlink_trap_policer_set(struct devlink *devlink,
 864                                   const struct devlink_trap_policer *policer,
 865                                   u64 rate, u64 burst,
 866                                   struct netlink_ext_ack *extack)
 867 {
 868         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 869
 870         if (nsim_dev->fail_trap_policer_set) {
 871                 NL_SET_ERR_MSG_MOD(extack, "User setup the operation to fail for testing purposes");
 872                 return -EINVAL;
 873         }
 874
 875         return 0;
 876 }
 877
 878 static int
 879 nsim_dev_devlink_trap_policer_counter_get(struct devlink *devlink,
 880                                           const struct devlink_trap_policer *policer,
 881                                           u64 *p_drops)
 882 {
 883         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 884         u64 *cnt;
 885
 886         if (nsim_dev->fail_trap_policer_counter_get)
 887                 return -EINVAL;
 888
 889         cnt = &nsim_dev->trap_data->trap_policers_cnt_arr[policer->id - 1];
 890         *p_drops = (*cnt)++;
 891
 892         return 0;
 893 }
 894
 895 static const struct devlink_ops nsim_dev_devlink_ops = {
 896         .supported_flash_update_params = DEVLINK_SUPPORT_FLASH_UPDATE_COMPONENT |
 897                                          DEVLINK_SUPPORT_FLASH_UPDATE_OVERWRITE_MASK,
 898         .reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT),
 899         .reload_down = nsim_dev_reload_down,
 900         .reload_up = nsim_dev_reload_up,
 901         .info_get = nsim_dev_info_get,
 902         .flash_update = nsim_dev_flash_update,
 903         .trap_init = nsim_dev_devlink_trap_init,
 904         .trap_action_set = nsim_dev_devlink_trap_action_set,
 905         .trap_group_set = nsim_dev_devlink_trap_group_set,
 906         .trap_policer_set = nsim_dev_devlink_trap_policer_set,
 907         .trap_policer_counter_get = nsim_dev_devlink_trap_policer_counter_get,
 908 };
 909
 910 #define NSIM_DEV_MAX_MACS_DEFAULT 32
 911 #define NSIM_DEV_TEST1_DEFAULT true
 912
 913 static int __nsim_dev_port_add(struct nsim_dev *nsim_dev,
 914                                unsigned int port_index)
 915 {
 916         struct devlink_port_attrs attrs = {};
 917         struct nsim_dev_port *nsim_dev_port;
 918         struct devlink_port *devlink_port;
 919         int err;
 920
 921         nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL);
 922         if (!nsim_dev_port)
 923                 return -ENOMEM;
 924         nsim_dev_port->port_index = port_index;
 925
 926         devlink_port = &nsim_dev_port->devlink_port;
 927         attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
 928         attrs.phys.port_number = port_index + 1;
 929         memcpy(attrs.switch_id.id, nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
 930         attrs.switch_id.id_len = nsim_dev->switch_id.id_len;
 931         devlink_port_attrs_set(devlink_port, &attrs);
 932         err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port,
 933                                     port_index);
 934         if (err)
 935                 goto err_port_free;
 936
 937         err = nsim_dev_port_debugfs_init(nsim_dev, nsim_dev_port);
 938         if (err)
 939                 goto err_dl_port_unregister;
 940
 941         nsim_dev_port->ns = nsim_create(nsim_dev, nsim_dev_port);
 942         if (IS_ERR(nsim_dev_port->ns)) {
 943                 err = PTR_ERR(nsim_dev_port->ns);
 944                 goto err_port_debugfs_exit;
 945         }
 946
 947         devlink_port_type_eth_set(devlink_port, nsim_dev_port->ns->netdev);
 948         list_add(&nsim_dev_port->list, &nsim_dev->port_list);
 949
 950         return 0;
 951
 952 err_port_debugfs_exit:
 953         nsim_dev_port_debugfs_exit(nsim_dev_port);
 954 err_dl_port_unregister:
 955         devlink_port_unregister(devlink_port);
 956 err_port_free:
 957         kfree(nsim_dev_port);
 958         return err;
 959 }
 960
 961 static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port)
 962 {
 963         struct devlink_port *devlink_port = &nsim_dev_port->devlink_port;
 964
 965         list_del(&nsim_dev_port->list);
 966         devlink_port_type_clear(devlink_port);
 967         nsim_destroy(nsim_dev_port->ns);
 968         nsim_dev_port_debugfs_exit(nsim_dev_port);
 969         devlink_port_unregister(devlink_port);
 970         kfree(nsim_dev_port);
 971 }
 972
 973 static void nsim_dev_port_del_all(struct nsim_dev *nsim_dev)
 974 {
 975         struct nsim_dev_port *nsim_dev_port, *tmp;
 976
 977         mutex_lock(&nsim_dev->port_list_lock);
 978         list_for_each_entry_safe(nsim_dev_port, tmp,
 979                                  &nsim_dev->port_list, list)
 980                 __nsim_dev_port_del(nsim_dev_port);
 981         mutex_unlock(&nsim_dev->port_list_lock);
 982 }
 983
 984 static int nsim_dev_port_add_all(struct nsim_dev *nsim_dev,
 985                                  unsigned int port_count)
 986 {
 987         int i, err;
 988
 989         for (i = 0; i < port_count; i++) {
 990                 err = __nsim_dev_port_add(nsim_dev, i);
 991                 if (err)
 992                         goto err_port_del_all;
 993         }
 994         return 0;
 995
 996 err_port_del_all:
 997         nsim_dev_port_del_all(nsim_dev);
 998         return err;
 999 }
1000
1001 static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
1002                                   struct netlink_ext_ack *extack)
1003 {
1004         struct nsim_bus_dev *nsim_bus_dev = nsim_dev->nsim_bus_dev;
1005         struct devlink *devlink;
1006         int err;
1007
1008         devlink = priv_to_devlink(nsim_dev);
1009         nsim_dev = devlink_priv(devlink);
1010         INIT_LIST_HEAD(&nsim_dev->port_list);
1011         mutex_init(&nsim_dev->port_list_lock);
1012         nsim_dev->fw_update_status = true;
1013         nsim_dev->fw_update_overwrite_mask = 0;
1014
1015         nsim_dev->fib_data = nsim_fib_create(devlink, extack);
1016         if (IS_ERR(nsim_dev->fib_data))
1017                 return PTR_ERR(nsim_dev->fib_data);
1018
1019         nsim_devlink_param_load_driverinit_values(devlink);
1020
1021         err = nsim_dev_dummy_region_init(nsim_dev, devlink);
1022         if (err)
1023                 goto err_fib_destroy;
1024
1025         err = nsim_dev_traps_init(devlink);
1026         if (err)
1027                 goto err_dummy_region_exit;
1028
1029         err = nsim_dev_health_init(nsim_dev, devlink);
1030         if (err)
1031                 goto err_traps_exit;
1032
1033         err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
1034         if (err)
1035                 goto err_health_exit;
1036
1037         nsim_dev->take_snapshot = debugfs_create_file("take_snapshot",
1038                                                       0200,
1039                                                       nsim_dev->ddir,
1040                                                       nsim_dev,
1041                                                 &nsim_dev_take_snapshot_fops);
1042         return 0;
1043
1044 err_health_exit:
1045         nsim_dev_health_exit(nsim_dev);
1046 err_traps_exit:
1047         nsim_dev_traps_exit(devlink);
1048 err_dummy_region_exit:
1049         nsim_dev_dummy_region_exit(nsim_dev);
1050 err_fib_destroy:
1051         nsim_fib_destroy(devlink, nsim_dev->fib_data);
1052         return err;
1053 }
1054
1055 int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
1056 {
1057         struct nsim_dev *nsim_dev;
1058         struct devlink *devlink;
1059         int err;
1060
1061         devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
1062         if (!devlink)
1063                 return -ENOMEM;
1064         devlink_net_set(devlink, nsim_bus_dev->initial_net);
1065         nsim_dev = devlink_priv(devlink);
1066         nsim_dev->nsim_bus_dev = nsim_bus_dev;
1067         nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
1068         get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
1069         INIT_LIST_HEAD(&nsim_dev->port_list);
1070         mutex_init(&nsim_dev->port_list_lock);
1071         nsim_dev->fw_update_status = true;
1072         nsim_dev->fw_update_overwrite_mask = 0;
1073         nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
1074         nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT;
1075         spin_lock_init(&nsim_dev->fa_cookie_lock);
1076
1077         dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
1078
1079         err = nsim_dev_resources_register(devlink);
1080         if (err)
1081                 goto err_devlink_free;
1082
1083         nsim_dev->fib_data = nsim_fib_create(devlink, NULL);
1084         if (IS_ERR(nsim_dev->fib_data)) {
1085                 err = PTR_ERR(nsim_dev->fib_data);
1086                 goto err_resources_unregister;
1087         }
1088
1089         err = devlink_register(devlink, &nsim_bus_dev->dev);
1090         if (err)
1091                 goto err_fib_destroy;
1092
1093         err = devlink_params_register(devlink, nsim_devlink_params,
1094                                       ARRAY_SIZE(nsim_devlink_params));
1095         if (err)
1096                 goto err_dl_unregister;
1097         nsim_devlink_set_params_init_values(nsim_dev, devlink);
1098
1099         err = nsim_dev_dummy_region_init(nsim_dev, devlink);
1100         if (err)
1101                 goto err_params_unregister;
1102
1103         err = nsim_dev_traps_init(devlink);
1104         if (err)
1105                 goto err_dummy_region_exit;
1106
1107         err = nsim_dev_debugfs_init(nsim_dev);
1108         if (err)
1109                 goto err_traps_exit;
1110
1111         err = nsim_dev_health_init(nsim_dev, devlink);
1112         if (err)
1113                 goto err_debugfs_exit;
1114
1115         err = nsim_bpf_dev_init(nsim_dev);
1116         if (err)
1117                 goto err_health_exit;
1118
1119         err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
1120         if (err)
1121                 goto err_bpf_dev_exit;
1122
1123         devlink_params_publish(devlink);
1124         devlink_reload_enable(devlink);
1125         return 0;
1126
1127 err_bpf_dev_exit:
1128         nsim_bpf_dev_exit(nsim_dev);
1129 err_health_exit:
1130         nsim_dev_health_exit(nsim_dev);
1131 err_debugfs_exit:
1132         nsim_dev_debugfs_exit(nsim_dev);
1133 err_traps_exit:
1134         nsim_dev_traps_exit(devlink);
1135 err_dummy_region_exit:
1136         nsim_dev_dummy_region_exit(nsim_dev);
1137 err_params_unregister:
1138         devlink_params_unregister(devlink, nsim_devlink_params,
1139                                   ARRAY_SIZE(nsim_devlink_params));
1140 err_dl_unregister:
1141         devlink_unregister(devlink);
1142 err_fib_destroy:
1143         nsim_fib_destroy(devlink, nsim_dev->fib_data);
1144 err_resources_unregister:
1145         devlink_resources_unregister(devlink, NULL);
1146 err_devlink_free:
1147         devlink_free(devlink);
1148         return err;
1149 }
1150
1151 static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
1152 {
1153         struct devlink *devlink = priv_to_devlink(nsim_dev);
1154
1155         if (devlink_is_reload_failed(devlink))
1156                 return;
1157         debugfs_remove(nsim_dev->take_snapshot);
1158         nsim_dev_port_del_all(nsim_dev);
1159         nsim_dev_health_exit(nsim_dev);
1160         nsim_dev_traps_exit(devlink);
1161         nsim_dev_dummy_region_exit(nsim_dev);
1162         mutex_destroy(&nsim_dev->port_list_lock);
1163         nsim_fib_destroy(devlink, nsim_dev->fib_data);
1164 }
1165
1166 void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
1167 {
1168         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
1169         struct devlink *devlink = priv_to_devlink(nsim_dev);
1170
1171         devlink_reload_disable(devlink);
1172
1173         nsim_dev_reload_destroy(nsim_dev);
1174
1175         nsim_bpf_dev_exit(nsim_dev);
1176         nsim_dev_debugfs_exit(nsim_dev);
1177         devlink_params_unregister(devlink, nsim_devlink_params,
1178                                   ARRAY_SIZE(nsim_devlink_params));
1179         devlink_unregister(devlink);
1180         devlink_resources_unregister(devlink, NULL);
1181         devlink_free(devlink);
1182 }
1183
1184 static struct nsim_dev_port *
1185 __nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index)
1186 {
1187         struct nsim_dev_port *nsim_dev_port;
1188
1189         list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list)
1190                 if (nsim_dev_port->port_index == port_index)
1191                         return nsim_dev_port;
1192         return NULL;
1193 }
1194
1195 int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
1196                       unsigned int port_index)
1197 {
1198         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
1199         int err;
1200
1201         mutex_lock(&nsim_dev->port_list_lock);
1202         if (__nsim_dev_port_lookup(nsim_dev, port_index))
1203                 err = -EEXIST;
1204         else
1205                 err = __nsim_dev_port_add(nsim_dev, port_index);
1206         mutex_unlock(&nsim_dev->port_list_lock);
1207         return err;
1208 }
1209
1210 int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
1211                       unsigned int port_index)
1212 {
1213         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
1214         struct nsim_dev_port *nsim_dev_port;
1215         int err = 0;
1216
1217         mutex_lock(&nsim_dev->port_list_lock);
1218         nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, port_index);
1219         if (!nsim_dev_port)
1220                 err = -ENOENT;
1221         else
1222                 __nsim_dev_port_del(nsim_dev_port);
1223         mutex_unlock(&nsim_dev->port_list_lock);
1224         return err;
1225 }
1226
1227 int nsim_dev_init(void)
1228 {
1229         nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL);
1230         return PTR_ERR_OR_ZERO(nsim_dev_ddir);
1231 }
1232
1233 void nsim_dev_exit(void)
1234 {
1235         debugfs_remove_recursive(nsim_dev_ddir);
1236 }