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