drivers/net/netdevsim/dev.c

   1 /*
   2  * Copyright (c) 2018 Cumulus Networks. All rights reserved.
   3  * Copyright (c) 2018 David Ahern <[email protected]>
   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, struct netlink_ext_ack *extack,
  44                        u8 **data)
  45 {
  46         void *dummy_data;
  47
  48         dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL);
  49         if (!dummy_data)
  50                 return -ENOMEM;
  51
  52         get_random_bytes(dummy_data, NSIM_DEV_DUMMY_REGION_SIZE);
  53
  54         *data = dummy_data;
  55
  56         return 0;
  57 }
  58
  59 static ssize_t nsim_dev_take_snapshot_write(struct file *file,
  60                                             const char __user *data,
  61                                             size_t count, loff_t *ppos)
  62 {
  63         struct nsim_dev *nsim_dev = file->private_data;
  64         struct devlink *devlink;
  65         u8 *dummy_data;
  66         int err;
  67         u32 id;
  68
  69         devlink = priv_to_devlink(nsim_dev);
  70
  71         err = nsim_dev_take_snapshot(devlink, NULL, &dummy_data);
  72         if (err)
  73                 return err;
  74
  75         err = devlink_region_snapshot_id_get(devlink, &id);
  76         if (err) {
  77                 pr_err("Failed to get snapshot id\n");
  78                 kfree(dummy_data);
  79                 return err;
  80         }
  81         err = devlink_region_snapshot_create(nsim_dev->dummy_region,
  82                                              dummy_data, id);
  83         devlink_region_snapshot_id_put(devlink, id);
  84         if (err) {
  85                 pr_err("Failed to create region snapshot\n");
  86                 kfree(dummy_data);
  87                 return err;
  88         }
  89
  90         return count;
  91 }
  92
  93 static const struct file_operations nsim_dev_take_snapshot_fops = {
  94         .open = simple_open,
  95         .write = nsim_dev_take_snapshot_write,
  96         .llseek = generic_file_llseek,
  97 };
  98
  99 static ssize_t nsim_dev_trap_fa_cookie_read(struct file *file,
 100                                             char __user *data,
 101                                             size_t count, loff_t *ppos)
 102 {
 103         struct nsim_dev *nsim_dev = file->private_data;
 104         struct flow_action_cookie *fa_cookie;
 105         unsigned int buf_len;
 106         ssize_t ret;
 107         char *buf;
 108
 109         spin_lock(&nsim_dev->fa_cookie_lock);
 110         fa_cookie = nsim_dev->fa_cookie;
 111         if (!fa_cookie) {
 112                 ret = -EINVAL;
 113                 goto errout;
 114         }
 115         buf_len = fa_cookie->cookie_len * 2;
 116         buf = kmalloc(buf_len, GFP_ATOMIC);
 117         if (!buf) {
 118                 ret = -ENOMEM;
 119                 goto errout;
 120         }
 121         bin2hex(buf, fa_cookie->cookie, fa_cookie->cookie_len);
 122         spin_unlock(&nsim_dev->fa_cookie_lock);
 123
 124         ret = simple_read_from_buffer(data, count, ppos, buf, buf_len);
 125
 126         kfree(buf);
 127         return ret;
 128
 129 errout:
 130         spin_unlock(&nsim_dev->fa_cookie_lock);
 131         return ret;
 132 }
 133
 134 static ssize_t nsim_dev_trap_fa_cookie_write(struct file *file,
 135                                              const char __user *data,
 136                                              size_t count, loff_t *ppos)
 137 {
 138         struct nsim_dev *nsim_dev = file->private_data;
 139         struct flow_action_cookie *fa_cookie;
 140         size_t cookie_len;
 141         ssize_t ret;
 142         char *buf;
 143
 144         if (*ppos != 0)
 145                 return -EINVAL;
 146         cookie_len = (count - 1) / 2;
 147         if ((count - 1) % 2)
 148                 return -EINVAL;
 149         buf = kmalloc(count, GFP_KERNEL | __GFP_NOWARN);
 150         if (!buf)
 151                 return -ENOMEM;
 152
 153         ret = simple_write_to_buffer(buf, count, ppos, data, count);
 154         if (ret < 0)
 155                 goto free_buf;
 156
 157         fa_cookie = kmalloc(sizeof(*fa_cookie) + cookie_len,
 158                             GFP_KERNEL | __GFP_NOWARN);
 159         if (!fa_cookie) {
 160                 ret = -ENOMEM;
 161                 goto free_buf;
 162         }
 163
 164         fa_cookie->cookie_len = cookie_len;
 165         ret = hex2bin(fa_cookie->cookie, buf, cookie_len);
 166         if (ret)
 167                 goto free_fa_cookie;
 168         kfree(buf);
 169
 170         spin_lock(&nsim_dev->fa_cookie_lock);
 171         kfree(nsim_dev->fa_cookie);
 172         nsim_dev->fa_cookie = fa_cookie;
 173         spin_unlock(&nsim_dev->fa_cookie_lock);
 174
 175         return count;
 176
 177 free_fa_cookie:
 178         kfree(fa_cookie);
 179 free_buf:
 180         kfree(buf);
 181         return ret;
 182 }
 183
 184 static const struct file_operations nsim_dev_trap_fa_cookie_fops = {
 185         .open = simple_open,
 186         .read = nsim_dev_trap_fa_cookie_read,
 187         .write = nsim_dev_trap_fa_cookie_write,
 188         .llseek = generic_file_llseek,
 189 };
 190
 191 static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
 192 {
 193         char dev_ddir_name[sizeof(DRV_NAME) + 10];
 194
 195         sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id);
 196         nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir);
 197         if (IS_ERR(nsim_dev->ddir))
 198                 return PTR_ERR(nsim_dev->ddir);
 199         nsim_dev->ports_ddir = debugfs_create_dir("ports", nsim_dev->ddir);
 200         if (IS_ERR(nsim_dev->ports_ddir))
 201                 return PTR_ERR(nsim_dev->ports_ddir);
 202         debugfs_create_bool("fw_update_status", 0600, nsim_dev->ddir,
 203                             &nsim_dev->fw_update_status);
 204         debugfs_create_u32("max_macs", 0600, nsim_dev->ddir,
 205                            &nsim_dev->max_macs);
 206         debugfs_create_bool("test1", 0600, nsim_dev->ddir,
 207                             &nsim_dev->test1);
 208         nsim_dev->take_snapshot = debugfs_create_file("take_snapshot",
 209                                                       0200,
 210                                                       nsim_dev->ddir,
 211                                                       nsim_dev,
 212                                                 &nsim_dev_take_snapshot_fops);
 213         debugfs_create_bool("dont_allow_reload", 0600, nsim_dev->ddir,
 214                             &nsim_dev->dont_allow_reload);
 215         debugfs_create_bool("fail_reload", 0600, nsim_dev->ddir,
 216                             &nsim_dev->fail_reload);
 217         debugfs_create_file("trap_flow_action_cookie", 0600, nsim_dev->ddir,
 218                             nsim_dev, &nsim_dev_trap_fa_cookie_fops);
 219         debugfs_create_bool("fail_trap_group_set", 0600,
 220                             nsim_dev->ddir,
 221                             &nsim_dev->fail_trap_group_set);
 222         debugfs_create_bool("fail_trap_policer_set", 0600,
 223                             nsim_dev->ddir,
 224                             &nsim_dev->fail_trap_policer_set);
 225         debugfs_create_bool("fail_trap_policer_counter_get", 0600,
 226                             nsim_dev->ddir,
 227                             &nsim_dev->fail_trap_policer_counter_get);
 228         nsim_udp_tunnels_debugfs_create(nsim_dev);
 229         return 0;
 230 }
 231
 232 static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
 233 {
 234         debugfs_remove_recursive(nsim_dev->ports_ddir);
 235         debugfs_remove_recursive(nsim_dev->ddir);
 236 }
 237
 238 static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
 239                                       struct nsim_dev_port *nsim_dev_port)
 240 {
 241         char port_ddir_name[16];
 242         char dev_link_name[32];
 243
 244         sprintf(port_ddir_name, "%u", nsim_dev_port->port_index);
 245         nsim_dev_port->ddir = debugfs_create_dir(port_ddir_name,
 246                                                  nsim_dev->ports_ddir);
 247         if (IS_ERR(nsim_dev_port->ddir))
 248                 return PTR_ERR(nsim_dev_port->ddir);
 249
 250         sprintf(dev_link_name, "../../../" DRV_NAME "%u",
 251                 nsim_dev->nsim_bus_dev->dev.id);
 252         debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name);
 253
 254         return 0;
 255 }
 256
 257 static void nsim_dev_port_debugfs_exit(struct nsim_dev_port *nsim_dev_port)
 258 {
 259         debugfs_remove_recursive(nsim_dev_port->ddir);
 260 }
 261
 262 static int nsim_dev_resources_register(struct devlink *devlink)
 263 {
 264         struct devlink_resource_size_params params = {
 265                 .size_max = (u64)-1,
 266                 .size_granularity = 1,
 267                 .unit = DEVLINK_RESOURCE_UNIT_ENTRY
 268         };
 269         int err;
 270
 271         /* Resources for IPv4 */
 272         err = devlink_resource_register(devlink, "IPv4", (u64)-1,
 273                                         NSIM_RESOURCE_IPV4,
 274                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 275                                         &params);
 276         if (err) {
 277                 pr_err("Failed to register IPv4 top resource\n");
 278                 goto out;
 279         }
 280
 281         err = devlink_resource_register(devlink, "fib", (u64)-1,
 282                                         NSIM_RESOURCE_IPV4_FIB,
 283                                         NSIM_RESOURCE_IPV4, &params);
 284         if (err) {
 285                 pr_err("Failed to register IPv4 FIB resource\n");
 286                 return err;
 287         }
 288
 289         err = devlink_resource_register(devlink, "fib-rules", (u64)-1,
 290                                         NSIM_RESOURCE_IPV4_FIB_RULES,
 291                                         NSIM_RESOURCE_IPV4, &params);
 292         if (err) {
 293                 pr_err("Failed to register IPv4 FIB rules resource\n");
 294                 return err;
 295         }
 296
 297         /* Resources for IPv6 */
 298         err = devlink_resource_register(devlink, "IPv6", (u64)-1,
 299                                         NSIM_RESOURCE_IPV6,
 300                                         DEVLINK_RESOURCE_ID_PARENT_TOP,
 301                                         &params);
 302         if (err) {
 303                 pr_err("Failed to register IPv6 top resource\n");
 304                 goto out;
 305         }
 306
 307         err = devlink_resource_register(devlink, "fib", (u64)-1,
 308                                         NSIM_RESOURCE_IPV6_FIB,
 309                                         NSIM_RESOURCE_IPV6, &params);
 310         if (err) {
 311                 pr_err("Failed to register IPv6 FIB resource\n");
 312                 return err;
 313         }
 314
 315         err = devlink_resource_register(devlink, "fib-rules", (u64)-1,
 316                                         NSIM_RESOURCE_IPV6_FIB_RULES,
 317                                         NSIM_RESOURCE_IPV6, &params);
 318         if (err) {
 319                 pr_err("Failed to register IPv6 FIB rules resource\n");
 320                 return err;
 321         }
 322
 323 out:
 324         return err;
 325 }
 326
 327 enum nsim_devlink_param_id {
 328         NSIM_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
 329         NSIM_DEVLINK_PARAM_ID_TEST1,
 330 };
 331
 332 static const struct devlink_param nsim_devlink_params[] = {
 333         DEVLINK_PARAM_GENERIC(MAX_MACS,
 334                               BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 335                               NULL, NULL, NULL),
 336         DEVLINK_PARAM_DRIVER(NSIM_DEVLINK_PARAM_ID_TEST1,
 337                              "test1", DEVLINK_PARAM_TYPE_BOOL,
 338                              BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 339                              NULL, NULL, NULL),
 340 };
 341
 342 static void nsim_devlink_set_params_init_values(struct nsim_dev *nsim_dev,
 343                                                 struct devlink *devlink)
 344 {
 345         union devlink_param_value value;
 346
 347         value.vu32 = nsim_dev->max_macs;
 348         devlink_param_driverinit_value_set(devlink,
 349                                            DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
 350                                            value);
 351         value.vbool = nsim_dev->test1;
 352         devlink_param_driverinit_value_set(devlink,
 353                                            NSIM_DEVLINK_PARAM_ID_TEST1,
 354                                            value);
 355 }
 356
 357 static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink)
 358 {
 359         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 360         union devlink_param_value saved_value;
 361         int err;
 362
 363         err = devlink_param_driverinit_value_get(devlink,
 364                                                  DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
 365                                                  &saved_value);
 366         if (!err)
 367                 nsim_dev->max_macs = saved_value.vu32;
 368         err = devlink_param_driverinit_value_get(devlink,
 369                                                  NSIM_DEVLINK_PARAM_ID_TEST1,
 370                                                  &saved_value);
 371         if (!err)
 372                 nsim_dev->test1 = saved_value.vbool;
 373 }
 374
 375 #define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16
 376
 377 static const struct devlink_region_ops dummy_region_ops = {
 378         .name = "dummy",
 379         .destructor = &kfree,
 380         .snapshot = nsim_dev_take_snapshot,
 381 };
 382
 383 static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,
 384                                       struct devlink *devlink)
 385 {
 386         nsim_dev->dummy_region =
 387                 devlink_region_create(devlink, &dummy_region_ops,
 388                                       NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX,
 389                                       NSIM_DEV_DUMMY_REGION_SIZE);
 390         return PTR_ERR_OR_ZERO(nsim_dev->dummy_region);
 391 }
 392
 393 static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev)
 394 {
 395         devlink_region_destroy(nsim_dev->dummy_region);
 396 }
 397
 398 struct nsim_trap_item {
 399         void *trap_ctx;
 400         enum devlink_trap_action action;
 401 };
 402
 403 struct nsim_trap_data {
 404         struct delayed_work trap_report_dw;
 405         struct nsim_trap_item *trap_items_arr;
 406         u64 *trap_policers_cnt_arr;
 407         struct nsim_dev *nsim_dev;
 408         spinlock_t trap_lock;   /* Protects trap_items_arr */
 409 };
 410
 411 /* All driver-specific traps must be documented in
 412  * Documentation/networking/devlink/netdevsim.rst
 413  */
 414 enum {
 415         NSIM_TRAP_ID_BASE = DEVLINK_TRAP_GENERIC_ID_MAX,
 416         NSIM_TRAP_ID_FID_MISS,
 417 };
 418
 419 #define NSIM_TRAP_NAME_FID_MISS "fid_miss"
 420
 421 #define NSIM_TRAP_METADATA DEVLINK_TRAP_METADATA_TYPE_F_IN_PORT
 422
 423 #define NSIM_TRAP_DROP(_id, _group_id)                                        \
 424         DEVLINK_TRAP_GENERIC(DROP, DROP, _id,                                 \
 425                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 426                              NSIM_TRAP_METADATA)
 427 #define NSIM_TRAP_DROP_EXT(_id, _group_id, _metadata)                         \
 428         DEVLINK_TRAP_GENERIC(DROP, DROP, _id,                                 \
 429                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 430                              NSIM_TRAP_METADATA | (_metadata))
 431 #define NSIM_TRAP_EXCEPTION(_id, _group_id)                                   \
 432         DEVLINK_TRAP_GENERIC(EXCEPTION, TRAP, _id,                            \
 433                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 434                              NSIM_TRAP_METADATA)
 435 #define NSIM_TRAP_CONTROL(_id, _group_id, _action)                            \
 436         DEVLINK_TRAP_GENERIC(CONTROL, _action, _id,                           \
 437                              DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,       \
 438                              NSIM_TRAP_METADATA)
 439 #define NSIM_TRAP_DRIVER_EXCEPTION(_id, _group_id)                            \
 440         DEVLINK_TRAP_DRIVER(EXCEPTION, TRAP, NSIM_TRAP_ID_##_id,              \
 441                             NSIM_TRAP_NAME_##_id,                             \
 442                             DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id,        \
 443                             NSIM_TRAP_METADATA)
 444
 445 #define NSIM_DEV_TRAP_POLICER_MIN_RATE  1
 446 #define NSIM_DEV_TRAP_POLICER_MAX_RATE  8000
 447 #define NSIM_DEV_TRAP_POLICER_MIN_BURST 8
 448 #define NSIM_DEV_TRAP_POLICER_MAX_BURST 65536
 449
 450 #define NSIM_TRAP_POLICER(_id, _rate, _burst)                                 \
 451         DEVLINK_TRAP_POLICER(_id, _rate, _burst,                              \
 452                              NSIM_DEV_TRAP_POLICER_MAX_RATE,                  \
 453                              NSIM_DEV_TRAP_POLICER_MIN_RATE,                  \
 454                              NSIM_DEV_TRAP_POLICER_MAX_BURST,                 \
 455                              NSIM_DEV_TRAP_POLICER_MIN_BURST)
 456
 457 static const struct devlink_trap_policer nsim_trap_policers_arr[] = {
 458         NSIM_TRAP_POLICER(1, 1000, 128),
 459         NSIM_TRAP_POLICER(2, 2000, 256),
 460         NSIM_TRAP_POLICER(3, 3000, 512),
 461 };
 462
 463 static const struct devlink_trap_group nsim_trap_groups_arr[] = {
 464         DEVLINK_TRAP_GROUP_GENERIC(L2_DROPS, 0),
 465         DEVLINK_TRAP_GROUP_GENERIC(L3_DROPS, 1),
 466         DEVLINK_TRAP_GROUP_GENERIC(L3_EXCEPTIONS, 1),
 467         DEVLINK_TRAP_GROUP_GENERIC(BUFFER_DROPS, 2),
 468         DEVLINK_TRAP_GROUP_GENERIC(ACL_DROPS, 3),
 469         DEVLINK_TRAP_GROUP_GENERIC(MC_SNOOPING, 3),
 470 };
 471
 472 static const struct devlink_trap nsim_traps_arr[] = {
 473         NSIM_TRAP_DROP(SMAC_MC, L2_DROPS),
 474         NSIM_TRAP_DROP(VLAN_TAG_MISMATCH, L2_DROPS),
 475         NSIM_TRAP_DROP(INGRESS_VLAN_FILTER, L2_DROPS),
 476         NSIM_TRAP_DROP(INGRESS_STP_FILTER, L2_DROPS),
 477         NSIM_TRAP_DROP(EMPTY_TX_LIST, L2_DROPS),
 478         NSIM_TRAP_DROP(PORT_LOOPBACK_FILTER, L2_DROPS),
 479         NSIM_TRAP_DRIVER_EXCEPTION(FID_MISS, L2_DROPS),
 480         NSIM_TRAP_DROP(BLACKHOLE_ROUTE, L3_DROPS),
 481         NSIM_TRAP_EXCEPTION(TTL_ERROR, L3_EXCEPTIONS),
 482         NSIM_TRAP_DROP(TAIL_DROP, BUFFER_DROPS),
 483         NSIM_TRAP_DROP_EXT(INGRESS_FLOW_ACTION_DROP, ACL_DROPS,
 484                            DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE),
 485         NSIM_TRAP_DROP_EXT(EGRESS_FLOW_ACTION_DROP, ACL_DROPS,
 486                            DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE),
 487         NSIM_TRAP_CONTROL(IGMP_QUERY, MC_SNOOPING, MIRROR),
 488         NSIM_TRAP_CONTROL(IGMP_V1_REPORT, MC_SNOOPING, TRAP),
 489 };
 490
 491 #define NSIM_TRAP_L4_DATA_LEN 100
 492
 493 static struct sk_buff *nsim_dev_trap_skb_build(void)
 494 {
 495         int tot_len, data_len = NSIM_TRAP_L4_DATA_LEN;
 496         struct sk_buff *skb;
 497         struct udphdr *udph;
 498         struct ethhdr *eth;
 499         struct iphdr *iph;
 500
 501         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 502         if (!skb)
 503                 return NULL;
 504         tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + data_len;
 505
 506         skb_reset_mac_header(skb);
 507         eth = skb_put(skb, sizeof(struct ethhdr));
 508         eth_random_addr(eth->h_dest);
 509         eth_random_addr(eth->h_source);
 510         eth->h_proto = htons(ETH_P_IP);
 511         skb->protocol = htons(ETH_P_IP);
 512
 513         skb_set_network_header(skb, skb->len);
 514         iph = skb_put(skb, sizeof(struct iphdr));
 515         iph->protocol = IPPROTO_UDP;
 516         iph->saddr = in_aton("192.0.2.1");
 517         iph->daddr = in_aton("198.51.100.1");
 518         iph->version = 0x4;
 519         iph->frag_off = 0;
 520         iph->ihl = 0x5;
 521         iph->tot_len = htons(tot_len);
 522         iph->ttl = 100;
 523         iph->check = 0;
 524         iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 525
 526         skb_set_transport_header(skb, skb->len);
 527         udph = skb_put_zero(skb, sizeof(struct udphdr) + data_len);
 528         get_random_bytes(&udph->source, sizeof(u16));
 529         get_random_bytes(&udph->dest, sizeof(u16));
 530         udph->len = htons(sizeof(struct udphdr) + data_len);
 531
 532         return skb;
 533 }
 534
 535 static void nsim_dev_trap_report(struct nsim_dev_port *nsim_dev_port)
 536 {
 537         struct nsim_dev *nsim_dev = nsim_dev_port->ns->nsim_dev;
 538         struct devlink *devlink = priv_to_devlink(nsim_dev);
 539         struct nsim_trap_data *nsim_trap_data;
 540         int i;
 541
 542         nsim_trap_data = nsim_dev->trap_data;
 543
 544         spin_lock(&nsim_trap_data->trap_lock);
 545         for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
 546                 struct flow_action_cookie *fa_cookie = NULL;
 547                 struct nsim_trap_item *nsim_trap_item;
 548                 struct sk_buff *skb;
 549                 bool has_fa_cookie;
 550
 551                 has_fa_cookie = nsim_traps_arr[i].metadata_cap &
 552                                 DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE;
 553
 554                 nsim_trap_item = &nsim_trap_data->trap_items_arr[i];
 555                 if (nsim_trap_item->action == DEVLINK_TRAP_ACTION_DROP)
 556                         continue;
 557
 558                 skb = nsim_dev_trap_skb_build();
 559                 if (!skb)
 560                         continue;
 561                 skb->dev = nsim_dev_port->ns->netdev;
 562
 563                 /* Trapped packets are usually passed to devlink in softIRQ,
 564                  * but in this case they are generated in a workqueue. Disable
 565                  * softIRQs to prevent lockdep from complaining about
 566                  * "incosistent lock state".
 567                  */
 568
 569                 spin_lock_bh(&nsim_dev->fa_cookie_lock);
 570                 fa_cookie = has_fa_cookie ? nsim_dev->fa_cookie : NULL;
 571                 devlink_trap_report(devlink, skb, nsim_trap_item->trap_ctx,
 572                                     &nsim_dev_port->devlink_port, fa_cookie);
 573                 spin_unlock_bh(&nsim_dev->fa_cookie_lock);
 574                 consume_skb(skb);
 575         }
 576         spin_unlock(&nsim_trap_data->trap_lock);
 577 }
 578
 579 #define NSIM_TRAP_REPORT_INTERVAL_MS    100
 580
 581 static void nsim_dev_trap_report_work(struct work_struct *work)
 582 {
 583         struct nsim_trap_data *nsim_trap_data;
 584         struct nsim_dev_port *nsim_dev_port;
 585         struct nsim_dev *nsim_dev;
 586
 587         nsim_trap_data = container_of(work, struct nsim_trap_data,
 588                                       trap_report_dw.work);
 589         nsim_dev = nsim_trap_data->nsim_dev;
 590
 591         /* For each running port and enabled packet trap, generate a UDP
 592          * packet with a random 5-tuple and report it.
 593          */
 594         mutex_lock(&nsim_dev->port_list_lock);
 595         list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list) {
 596                 if (!netif_running(nsim_dev_port->ns->netdev))
 597                         continue;
 598
 599                 nsim_dev_trap_report(nsim_dev_port);
 600         }
 601         mutex_unlock(&nsim_dev->port_list_lock);
 602
 603         schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
 604                               msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));
 605 }
 606
 607 static int nsim_dev_traps_init(struct devlink *devlink)
 608 {
 609         size_t policers_count = ARRAY_SIZE(nsim_trap_policers_arr);
 610         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 611         struct nsim_trap_data *nsim_trap_data;
 612         int err;
 613
 614         nsim_trap_data = kzalloc(sizeof(*nsim_trap_data), GFP_KERNEL);
 615         if (!nsim_trap_data)
 616                 return -ENOMEM;
 617
 618         nsim_trap_data->trap_items_arr = kcalloc(ARRAY_SIZE(nsim_traps_arr),
 619                                                  sizeof(struct nsim_trap_item),
 620                                                  GFP_KERNEL);
 621         if (!nsim_trap_data->trap_items_arr) {
 622                 err = -ENOMEM;
 623                 goto err_trap_data_free;
 624         }
 625
 626         nsim_trap_data->trap_policers_cnt_arr = kcalloc(policers_count,
 627                                                         sizeof(u64),
 628                                                         GFP_KERNEL);
 629         if (!nsim_trap_data->trap_policers_cnt_arr) {
 630                 err = -ENOMEM;
 631                 goto err_trap_items_free;
 632         }
 633
 634         /* The lock is used to protect the action state of the registered
 635          * traps. The value is written by user and read in delayed work when
 636          * iterating over all the traps.
 637          */
 638         spin_lock_init(&nsim_trap_data->trap_lock);
 639         nsim_trap_data->nsim_dev = nsim_dev;
 640         nsim_dev->trap_data = nsim_trap_data;
 641
 642         err = devlink_trap_policers_register(devlink, nsim_trap_policers_arr,
 643                                              policers_count);
 644         if (err)
 645                 goto err_trap_policers_cnt_free;
 646
 647         err = devlink_trap_groups_register(devlink, nsim_trap_groups_arr,
 648                                            ARRAY_SIZE(nsim_trap_groups_arr));
 649         if (err)
 650                 goto err_trap_policers_unregister;
 651
 652         err = devlink_traps_register(devlink, nsim_traps_arr,
 653                                      ARRAY_SIZE(nsim_traps_arr), NULL);
 654         if (err)
 655                 goto err_trap_groups_unregister;
 656
 657         INIT_DELAYED_WORK(&nsim_dev->trap_data->trap_report_dw,
 658                           nsim_dev_trap_report_work);
 659         schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
 660                               msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));
 661
 662         return 0;
 663
 664 err_trap_groups_unregister:
 665         devlink_trap_groups_unregister(devlink, nsim_trap_groups_arr,
 666                                        ARRAY_SIZE(nsim_trap_groups_arr));
 667 err_trap_policers_unregister:
 668         devlink_trap_policers_unregister(devlink, nsim_trap_policers_arr,
 669                                          ARRAY_SIZE(nsim_trap_policers_arr));
 670 err_trap_policers_cnt_free:
 671         kfree(nsim_trap_data->trap_policers_cnt_arr);
 672 err_trap_items_free:
 673         kfree(nsim_trap_data->trap_items_arr);
 674 err_trap_data_free:
 675         kfree(nsim_trap_data);
 676         return err;
 677 }
 678
 679 static void nsim_dev_traps_exit(struct devlink *devlink)
 680 {
 681         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 682
 683         cancel_delayed_work_sync(&nsim_dev->trap_data->trap_report_dw);
 684         devlink_traps_unregister(devlink, nsim_traps_arr,
 685                                  ARRAY_SIZE(nsim_traps_arr));
 686         devlink_trap_groups_unregister(devlink, nsim_trap_groups_arr,
 687                                        ARRAY_SIZE(nsim_trap_groups_arr));
 688         devlink_trap_policers_unregister(devlink, nsim_trap_policers_arr,
 689                                          ARRAY_SIZE(nsim_trap_policers_arr));
 690         kfree(nsim_dev->trap_data->trap_policers_cnt_arr);
 691         kfree(nsim_dev->trap_data->trap_items_arr);
 692         kfree(nsim_dev->trap_data);
 693 }
 694
 695 static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
 696                                   struct netlink_ext_ack *extack);
 697 static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev);
 698
 699 static int nsim_dev_reload_down(struct devlink *devlink, bool netns_change,
 700                                 struct netlink_ext_ack *extack)
 701 {
 702         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 703
 704         if (nsim_dev->dont_allow_reload) {
 705                 /* For testing purposes, user set debugfs dont_allow_reload
 706                  * value to true. So forbid it.
 707                  */
 708                 NL_SET_ERR_MSG_MOD(extack, "User forbid the reload for testing purposes");
 709                 return -EOPNOTSUPP;
 710         }
 711
 712         nsim_dev_reload_destroy(nsim_dev);
 713         return 0;
 714 }
 715
 716 static int nsim_dev_reload_up(struct devlink *devlink,
 717                               struct netlink_ext_ack *extack)
 718 {
 719         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 720
 721         if (nsim_dev->fail_reload) {
 722                 /* For testing purposes, user set debugfs fail_reload
 723                  * value to true. Fail right away.
 724                  */
 725                 NL_SET_ERR_MSG_MOD(extack, "User setup the reload to fail for testing purposes");
 726                 return -EINVAL;
 727         }
 728
 729         return nsim_dev_reload_create(nsim_dev, extack);
 730 }
 731
 732 static int nsim_dev_info_get(struct devlink *devlink,
 733                              struct devlink_info_req *req,
 734                              struct netlink_ext_ack *extack)
 735 {
 736         return devlink_info_driver_name_put(req, DRV_NAME);
 737 }
 738
 739 #define NSIM_DEV_FLASH_SIZE 500000
 740 #define NSIM_DEV_FLASH_CHUNK_SIZE 1000
 741 #define NSIM_DEV_FLASH_CHUNK_TIME_MS 10
 742
 743 static int nsim_dev_flash_update(struct devlink *devlink, const char *file_name,
 744                                  const char *component,
 745                                  struct netlink_ext_ack *extack)
 746 {
 747         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 748         int i;
 749
 750         if (nsim_dev->fw_update_status) {
 751                 devlink_flash_update_begin_notify(devlink);
 752                 devlink_flash_update_status_notify(devlink,
 753                                                    "Preparing to flash",
 754                                                    component, 0, 0);
 755         }
 756
 757         for (i = 0; i < NSIM_DEV_FLASH_SIZE / NSIM_DEV_FLASH_CHUNK_SIZE; i++) {
 758                 if (nsim_dev->fw_update_status)
 759                         devlink_flash_update_status_notify(devlink, "Flashing",
 760                                                            component,
 761                                                            i * NSIM_DEV_FLASH_CHUNK_SIZE,
 762                                                            NSIM_DEV_FLASH_SIZE);
 763                 msleep(NSIM_DEV_FLASH_CHUNK_TIME_MS);
 764         }
 765
 766         if (nsim_dev->fw_update_status) {
 767                 devlink_flash_update_status_notify(devlink, "Flashing",
 768                                                    component,
 769                                                    NSIM_DEV_FLASH_SIZE,
 770                                                    NSIM_DEV_FLASH_SIZE);
 771                 devlink_flash_update_status_notify(devlink, "Flashing done",
 772                                                    component, 0, 0);
 773                 devlink_flash_update_end_notify(devlink);
 774         }
 775
 776         return 0;
 777 }
 778
 779 static struct nsim_trap_item *
 780 nsim_dev_trap_item_lookup(struct nsim_dev *nsim_dev, u16 trap_id)
 781 {
 782         struct nsim_trap_data *nsim_trap_data = nsim_dev->trap_data;
 783         int i;
 784
 785         for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
 786                 if (nsim_traps_arr[i].id == trap_id)
 787                         return &nsim_trap_data->trap_items_arr[i];
 788         }
 789
 790         return NULL;
 791 }
 792
 793 static int nsim_dev_devlink_trap_init(struct devlink *devlink,
 794                                       const struct devlink_trap *trap,
 795                                       void *trap_ctx)
 796 {
 797         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 798         struct nsim_trap_item *nsim_trap_item;
 799
 800         nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
 801         if (WARN_ON(!nsim_trap_item))
 802                 return -ENOENT;
 803
 804         nsim_trap_item->trap_ctx = trap_ctx;
 805         nsim_trap_item->action = trap->init_action;
 806
 807         return 0;
 808 }
 809
 810 static int
 811 nsim_dev_devlink_trap_action_set(struct devlink *devlink,
 812                                  const struct devlink_trap *trap,
 813                                  enum devlink_trap_action action,
 814                                  struct netlink_ext_ack *extack)
 815 {
 816         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 817         struct nsim_trap_item *nsim_trap_item;
 818
 819         nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
 820         if (WARN_ON(!nsim_trap_item))
 821                 return -ENOENT;
 822
 823         spin_lock(&nsim_dev->trap_data->trap_lock);
 824         nsim_trap_item->action = action;
 825         spin_unlock(&nsim_dev->trap_data->trap_lock);
 826
 827         return 0;
 828 }
 829
 830 static int
 831 nsim_dev_devlink_trap_group_set(struct devlink *devlink,
 832                                 const struct devlink_trap_group *group,
 833                                 const struct devlink_trap_policer *policer,
 834                                 struct netlink_ext_ack *extack)
 835 {
 836         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 837
 838         if (nsim_dev->fail_trap_group_set)
 839                 return -EINVAL;
 840
 841         return 0;
 842 }
 843
 844 static int
 845 nsim_dev_devlink_trap_policer_set(struct devlink *devlink,
 846                                   const struct devlink_trap_policer *policer,
 847                                   u64 rate, u64 burst,
 848                                   struct netlink_ext_ack *extack)
 849 {
 850         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 851
 852         if (nsim_dev->fail_trap_policer_set) {
 853                 NL_SET_ERR_MSG_MOD(extack, "User setup the operation to fail for testing purposes");
 854                 return -EINVAL;
 855         }
 856
 857         return 0;
 858 }
 859
 860 static int
 861 nsim_dev_devlink_trap_policer_counter_get(struct devlink *devlink,
 862                                           const struct devlink_trap_policer *policer,
 863                                           u64 *p_drops)
 864 {
 865         struct nsim_dev *nsim_dev = devlink_priv(devlink);
 866         u64 *cnt;
 867
 868         if (nsim_dev->fail_trap_policer_counter_get)
 869                 return -EINVAL;
 870
 871         cnt = &nsim_dev->trap_data->trap_policers_cnt_arr[policer->id - 1];
 872         *p_drops = (*cnt)++;
 873
 874         return 0;
 875 }
 876
 877 static const struct devlink_ops nsim_dev_devlink_ops = {
 878         .reload_down = nsim_dev_reload_down,
 879         .reload_up = nsim_dev_reload_up,
 880         .info_get = nsim_dev_info_get,
 881         .flash_update = nsim_dev_flash_update,
 882         .trap_init = nsim_dev_devlink_trap_init,
 883         .trap_action_set = nsim_dev_devlink_trap_action_set,
 884         .trap_group_set = nsim_dev_devlink_trap_group_set,
 885         .trap_policer_set = nsim_dev_devlink_trap_policer_set,
 886         .trap_policer_counter_get = nsim_dev_devlink_trap_policer_counter_get,
 887 };
 888
 889 #define NSIM_DEV_MAX_MACS_DEFAULT 32
 890 #define NSIM_DEV_TEST1_DEFAULT true
 891
 892 static int __nsim_dev_port_add(struct nsim_dev *nsim_dev,
 893                                unsigned int port_index)
 894 {
 895         struct devlink_port_attrs attrs = {};
 896         struct nsim_dev_port *nsim_dev_port;
 897         struct devlink_port *devlink_port;
 898         int err;
 899
 900         nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL);
 901         if (!nsim_dev_port)
 902                 return -ENOMEM;
 903         nsim_dev_port->port_index = port_index;
 904
 905         devlink_port = &nsim_dev_port->devlink_port;
 906         attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
 907         attrs.phys.port_number = port_index + 1;
 908         memcpy(attrs.switch_id.id, nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
 909         attrs.switch_id.id_len = nsim_dev->switch_id.id_len;
 910         devlink_port_attrs_set(devlink_port, &attrs);
 911         err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port,
 912                                     port_index);
 913         if (err)
 914                 goto err_port_free;
 915
 916         err = nsim_dev_port_debugfs_init(nsim_dev, nsim_dev_port);
 917         if (err)
 918                 goto err_dl_port_unregister;
 919
 920         nsim_dev_port->ns = nsim_create(nsim_dev, nsim_dev_port);
 921         if (IS_ERR(nsim_dev_port->ns)) {
 922                 err = PTR_ERR(nsim_dev_port->ns);
 923                 goto err_port_debugfs_exit;
 924         }
 925
 926         devlink_port_type_eth_set(devlink_port, nsim_dev_port->ns->netdev);
 927         list_add(&nsim_dev_port->list, &nsim_dev->port_list);
 928
 929         return 0;
 930
 931 err_port_debugfs_exit:
 932         nsim_dev_port_debugfs_exit(nsim_dev_port);
 933 err_dl_port_unregister:
 934         devlink_port_unregister(devlink_port);
 935 err_port_free:
 936         kfree(nsim_dev_port);
 937         return err;
 938 }
 939
 940 static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port)
 941 {
 942         struct devlink_port *devlink_port = &nsim_dev_port->devlink_port;
 943
 944         list_del(&nsim_dev_port->list);
 945         devlink_port_type_clear(devlink_port);
 946         nsim_destroy(nsim_dev_port->ns);
 947         nsim_dev_port_debugfs_exit(nsim_dev_port);
 948         devlink_port_unregister(devlink_port);
 949         kfree(nsim_dev_port);
 950 }
 951
 952 static void nsim_dev_port_del_all(struct nsim_dev *nsim_dev)
 953 {
 954         struct nsim_dev_port *nsim_dev_port, *tmp;
 955
 956         mutex_lock(&nsim_dev->port_list_lock);
 957         list_for_each_entry_safe(nsim_dev_port, tmp,
 958                                  &nsim_dev->port_list, list)
 959                 __nsim_dev_port_del(nsim_dev_port);
 960         mutex_unlock(&nsim_dev->port_list_lock);
 961 }
 962
 963 static int nsim_dev_port_add_all(struct nsim_dev *nsim_dev,
 964                                  unsigned int port_count)
 965 {
 966         int i, err;
 967
 968         for (i = 0; i < port_count; i++) {
 969                 err = __nsim_dev_port_add(nsim_dev, i);
 970                 if (err)
 971                         goto err_port_del_all;
 972         }
 973         return 0;
 974
 975 err_port_del_all:
 976         nsim_dev_port_del_all(nsim_dev);
 977         return err;
 978 }
 979
 980 static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
 981                                   struct netlink_ext_ack *extack)
 982 {
 983         struct nsim_bus_dev *nsim_bus_dev = nsim_dev->nsim_bus_dev;
 984         struct devlink *devlink;
 985         int err;
 986
 987         devlink = priv_to_devlink(nsim_dev);
 988         nsim_dev = devlink_priv(devlink);
 989         INIT_LIST_HEAD(&nsim_dev->port_list);
 990         mutex_init(&nsim_dev->port_list_lock);
 991         nsim_dev->fw_update_status = true;
 992
 993         nsim_dev->fib_data = nsim_fib_create(devlink, extack);
 994         if (IS_ERR(nsim_dev->fib_data))
 995                 return PTR_ERR(nsim_dev->fib_data);
 996
 997         nsim_devlink_param_load_driverinit_values(devlink);
 998
 999         err = nsim_dev_dummy_region_init(nsim_dev, devlink);
1000         if (err)
1001                 goto err_fib_destroy;
1002
1003         err = nsim_dev_traps_init(devlink);
1004         if (err)
1005                 goto err_dummy_region_exit;
1006
1007         err = nsim_dev_health_init(nsim_dev, devlink);
1008         if (err)
1009                 goto err_traps_exit;
1010
1011         err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
1012         if (err)
1013                 goto err_health_exit;
1014
1015         nsim_dev->take_snapshot = debugfs_create_file("take_snapshot",
1016                                                       0200,
1017                                                       nsim_dev->ddir,
1018                                                       nsim_dev,
1019                                                 &nsim_dev_take_snapshot_fops);
1020         return 0;
1021
1022 err_health_exit:
1023         nsim_dev_health_exit(nsim_dev);
1024 err_traps_exit:
1025         nsim_dev_traps_exit(devlink);
1026 err_dummy_region_exit:
1027         nsim_dev_dummy_region_exit(nsim_dev);
1028 err_fib_destroy:
1029         nsim_fib_destroy(devlink, nsim_dev->fib_data);
1030         return err;
1031 }
1032
1033 int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
1034 {
1035         struct nsim_dev *nsim_dev;
1036         struct devlink *devlink;
1037         int err;
1038
1039         devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
1040         if (!devlink)
1041                 return -ENOMEM;
1042         devlink_net_set(devlink, nsim_bus_dev->initial_net);
1043         nsim_dev = devlink_priv(devlink);
1044         nsim_dev->nsim_bus_dev = nsim_bus_dev;
1045         nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
1046         get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
1047         INIT_LIST_HEAD(&nsim_dev->port_list);
1048         mutex_init(&nsim_dev->port_list_lock);
1049         nsim_dev->fw_update_status = true;
1050         nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
1051         nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT;
1052         spin_lock_init(&nsim_dev->fa_cookie_lock);
1053
1054         dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
1055
1056         err = nsim_dev_resources_register(devlink);
1057         if (err)
1058                 goto err_devlink_free;
1059
1060         nsim_dev->fib_data = nsim_fib_create(devlink, NULL);
1061         if (IS_ERR(nsim_dev->fib_data)) {
1062                 err = PTR_ERR(nsim_dev->fib_data);
1063                 goto err_resources_unregister;
1064         }
1065
1066         err = devlink_register(devlink, &nsim_bus_dev->dev);
1067         if (err)
1068                 goto err_fib_destroy;
1069
1070         err = devlink_params_register(devlink, nsim_devlink_params,
1071                                       ARRAY_SIZE(nsim_devlink_params));
1072         if (err)
1073                 goto err_dl_unregister;
1074         nsim_devlink_set_params_init_values(nsim_dev, devlink);
1075
1076         err = nsim_dev_dummy_region_init(nsim_dev, devlink);
1077         if (err)
1078                 goto err_params_unregister;
1079
1080         err = nsim_dev_traps_init(devlink);
1081         if (err)
1082                 goto err_dummy_region_exit;
1083
1084         err = nsim_dev_debugfs_init(nsim_dev);
1085         if (err)
1086                 goto err_traps_exit;
1087
1088         err = nsim_dev_health_init(nsim_dev, devlink);
1089         if (err)
1090                 goto err_debugfs_exit;
1091
1092         err = nsim_bpf_dev_init(nsim_dev);
1093         if (err)
1094                 goto err_health_exit;
1095
1096         err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
1097         if (err)
1098                 goto err_bpf_dev_exit;
1099
1100         devlink_params_publish(devlink);
1101         devlink_reload_enable(devlink);
1102         return 0;
1103
1104 err_bpf_dev_exit:
1105         nsim_bpf_dev_exit(nsim_dev);
1106 err_health_exit:
1107         nsim_dev_health_exit(nsim_dev);
1108 err_debugfs_exit:
1109         nsim_dev_debugfs_exit(nsim_dev);
1110 err_traps_exit:
1111         nsim_dev_traps_exit(devlink);
1112 err_dummy_region_exit:
1113         nsim_dev_dummy_region_exit(nsim_dev);
1114 err_params_unregister:
1115         devlink_params_unregister(devlink, nsim_devlink_params,
1116                                   ARRAY_SIZE(nsim_devlink_params));
1117 err_dl_unregister:
1118         devlink_unregister(devlink);
1119 err_fib_destroy:
1120         nsim_fib_destroy(devlink, nsim_dev->fib_data);
1121 err_resources_unregister:
1122         devlink_resources_unregister(devlink, NULL);
1123 err_devlink_free:
1124         devlink_free(devlink);
1125         return err;
1126 }
1127
1128 static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
1129 {
1130         struct devlink *devlink = priv_to_devlink(nsim_dev);
1131
1132         if (devlink_is_reload_failed(devlink))
1133                 return;
1134         debugfs_remove(nsim_dev->take_snapshot);
1135         nsim_dev_port_del_all(nsim_dev);
1136         nsim_dev_health_exit(nsim_dev);
1137         nsim_dev_traps_exit(devlink);
1138         nsim_dev_dummy_region_exit(nsim_dev);
1139         mutex_destroy(&nsim_dev->port_list_lock);
1140         nsim_fib_destroy(devlink, nsim_dev->fib_data);
1141 }
1142
1143 void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
1144 {
1145         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
1146         struct devlink *devlink = priv_to_devlink(nsim_dev);
1147
1148         devlink_reload_disable(devlink);
1149
1150         nsim_dev_reload_destroy(nsim_dev);
1151
1152         nsim_bpf_dev_exit(nsim_dev);
1153         nsim_dev_debugfs_exit(nsim_dev);
1154         devlink_params_unregister(devlink, nsim_devlink_params,
1155                                   ARRAY_SIZE(nsim_devlink_params));
1156         devlink_unregister(devlink);
1157         devlink_resources_unregister(devlink, NULL);
1158         devlink_free(devlink);
1159 }
1160
1161 static struct nsim_dev_port *
1162 __nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index)
1163 {
1164         struct nsim_dev_port *nsim_dev_port;
1165
1166         list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list)
1167                 if (nsim_dev_port->port_index == port_index)
1168                         return nsim_dev_port;
1169         return NULL;
1170 }
1171
1172 int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
1173                       unsigned int port_index)
1174 {
1175         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
1176         int err;
1177
1178         mutex_lock(&nsim_dev->port_list_lock);
1179         if (__nsim_dev_port_lookup(nsim_dev, port_index))
1180                 err = -EEXIST;
1181         else
1182                 err = __nsim_dev_port_add(nsim_dev, port_index);
1183         mutex_unlock(&nsim_dev->port_list_lock);
1184         return err;
1185 }
1186
1187 int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
1188                       unsigned int port_index)
1189 {
1190         struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
1191         struct nsim_dev_port *nsim_dev_port;
1192         int err = 0;
1193
1194         mutex_lock(&nsim_dev->port_list_lock);
1195         nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, port_index);
1196         if (!nsim_dev_port)
1197                 err = -ENOENT;
1198         else
1199                 __nsim_dev_port_del(nsim_dev_port);
1200         mutex_unlock(&nsim_dev->port_list_lock);
1201         return err;
1202 }
1203
1204 int nsim_dev_init(void)
1205 {
1206         nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL);
1207         return PTR_ERR_OR_ZERO(nsim_dev_ddir);
1208 }
1209
1210 void nsim_dev_exit(void)
1211 {
1212         debugfs_remove_recursive(nsim_dev_ddir);
1213 }