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