1 /* 2 * Copyright (c) 2018 Cumulus Networks. All rights reserved. 3 * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com> 4 * Copyright (c) 2019 Mellanox Technologies. All rights reserved. 5 * 6 * This software is licensed under the GNU General License Version 2, 7 * June 1991 as shown in the file COPYING in the top-level directory of this 8 * source tree. 9 * 10 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" 11 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, 12 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 13 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE 14 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME 15 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 16 */ 17 18 #include <linux/debugfs.h> 19 #include <linux/device.h> 20 #include <linux/etherdevice.h> 21 #include <linux/inet.h> 22 #include <linux/jiffies.h> 23 #include <linux/kernel.h> 24 #include <linux/list.h> 25 #include <linux/mutex.h> 26 #include <linux/random.h> 27 #include <linux/rtnetlink.h> 28 #include <linux/workqueue.h> 29 #include <net/devlink.h> 30 #include <net/ip.h> 31 #include <net/flow_offload.h> 32 #include <uapi/linux/devlink.h> 33 #include <uapi/linux/ip.h> 34 #include <uapi/linux/udp.h> 35 36 #include "netdevsim.h" 37 38 static struct dentry *nsim_dev_ddir; 39 40 #define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32) 41 42 static int 43 nsim_dev_take_snapshot(struct devlink *devlink, 44 const struct devlink_region_ops *ops, 45 struct netlink_ext_ack *extack, 46 u8 **data) 47 { 48 void *dummy_data; 49 50 dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL); 51 if (!dummy_data) 52 return -ENOMEM; 53 54 get_random_bytes(dummy_data, NSIM_DEV_DUMMY_REGION_SIZE); 55 56 *data = dummy_data; 57 58 return 0; 59 } 60 61 static ssize_t nsim_dev_take_snapshot_write(struct file *file, 62 const char __user *data, 63 size_t count, loff_t *ppos) 64 { 65 struct nsim_dev *nsim_dev = file->private_data; 66 struct devlink *devlink; 67 u8 *dummy_data; 68 int err; 69 u32 id; 70 71 devlink = priv_to_devlink(nsim_dev); 72 73 err = nsim_dev_take_snapshot(devlink, NULL, NULL, &dummy_data); 74 if (err) 75 return err; 76 77 err = devlink_region_snapshot_id_get(devlink, &id); 78 if (err) { 79 pr_err("Failed to get snapshot id\n"); 80 kfree(dummy_data); 81 return err; 82 } 83 err = devlink_region_snapshot_create(nsim_dev->dummy_region, 84 dummy_data, id); 85 devlink_region_snapshot_id_put(devlink, id); 86 if (err) { 87 pr_err("Failed to create region snapshot\n"); 88 kfree(dummy_data); 89 return err; 90 } 91 92 return count; 93 } 94 95 static const struct file_operations nsim_dev_take_snapshot_fops = { 96 .open = simple_open, 97 .write = nsim_dev_take_snapshot_write, 98 .llseek = generic_file_llseek, 99 }; 100 101 static ssize_t nsim_dev_trap_fa_cookie_read(struct file *file, 102 char __user *data, 103 size_t count, loff_t *ppos) 104 { 105 struct nsim_dev *nsim_dev = file->private_data; 106 struct flow_action_cookie *fa_cookie; 107 unsigned int buf_len; 108 ssize_t ret; 109 char *buf; 110 111 spin_lock(&nsim_dev->fa_cookie_lock); 112 fa_cookie = nsim_dev->fa_cookie; 113 if (!fa_cookie) { 114 ret = -EINVAL; 115 goto errout; 116 } 117 buf_len = fa_cookie->cookie_len * 2; 118 buf = kmalloc(buf_len, GFP_ATOMIC); 119 if (!buf) { 120 ret = -ENOMEM; 121 goto errout; 122 } 123 bin2hex(buf, fa_cookie->cookie, fa_cookie->cookie_len); 124 spin_unlock(&nsim_dev->fa_cookie_lock); 125 126 ret = simple_read_from_buffer(data, count, ppos, buf, buf_len); 127 128 kfree(buf); 129 return ret; 130 131 errout: 132 spin_unlock(&nsim_dev->fa_cookie_lock); 133 return ret; 134 } 135 136 static ssize_t nsim_dev_trap_fa_cookie_write(struct file *file, 137 const char __user *data, 138 size_t count, loff_t *ppos) 139 { 140 struct nsim_dev *nsim_dev = file->private_data; 141 struct flow_action_cookie *fa_cookie; 142 size_t cookie_len; 143 ssize_t ret; 144 char *buf; 145 146 if (*ppos != 0) 147 return -EINVAL; 148 cookie_len = (count - 1) / 2; 149 if ((count - 1) % 2) 150 return -EINVAL; 151 buf = kmalloc(count, GFP_KERNEL | __GFP_NOWARN); 152 if (!buf) 153 return -ENOMEM; 154 155 ret = simple_write_to_buffer(buf, count, ppos, data, count); 156 if (ret < 0) 157 goto free_buf; 158 159 fa_cookie = kmalloc(sizeof(*fa_cookie) + cookie_len, 160 GFP_KERNEL | __GFP_NOWARN); 161 if (!fa_cookie) { 162 ret = -ENOMEM; 163 goto free_buf; 164 } 165 166 fa_cookie->cookie_len = cookie_len; 167 ret = hex2bin(fa_cookie->cookie, buf, cookie_len); 168 if (ret) 169 goto free_fa_cookie; 170 kfree(buf); 171 172 spin_lock(&nsim_dev->fa_cookie_lock); 173 kfree(nsim_dev->fa_cookie); 174 nsim_dev->fa_cookie = fa_cookie; 175 spin_unlock(&nsim_dev->fa_cookie_lock); 176 177 return count; 178 179 free_fa_cookie: 180 kfree(fa_cookie); 181 free_buf: 182 kfree(buf); 183 return ret; 184 } 185 186 static const struct file_operations nsim_dev_trap_fa_cookie_fops = { 187 .open = simple_open, 188 .read = nsim_dev_trap_fa_cookie_read, 189 .write = nsim_dev_trap_fa_cookie_write, 190 .llseek = generic_file_llseek, 191 }; 192 193 static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev) 194 { 195 char dev_ddir_name[sizeof(DRV_NAME) + 10]; 196 197 sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id); 198 nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir); 199 if (IS_ERR(nsim_dev->ddir)) 200 return PTR_ERR(nsim_dev->ddir); 201 nsim_dev->ports_ddir = debugfs_create_dir("ports", nsim_dev->ddir); 202 if (IS_ERR(nsim_dev->ports_ddir)) 203 return PTR_ERR(nsim_dev->ports_ddir); 204 debugfs_create_bool("fw_update_status", 0600, nsim_dev->ddir, 205 &nsim_dev->fw_update_status); 206 debugfs_create_u32("max_macs", 0600, nsim_dev->ddir, 207 &nsim_dev->max_macs); 208 debugfs_create_bool("test1", 0600, nsim_dev->ddir, 209 &nsim_dev->test1); 210 nsim_dev->take_snapshot = debugfs_create_file("take_snapshot", 211 0200, 212 nsim_dev->ddir, 213 nsim_dev, 214 &nsim_dev_take_snapshot_fops); 215 debugfs_create_bool("dont_allow_reload", 0600, nsim_dev->ddir, 216 &nsim_dev->dont_allow_reload); 217 debugfs_create_bool("fail_reload", 0600, nsim_dev->ddir, 218 &nsim_dev->fail_reload); 219 debugfs_create_file("trap_flow_action_cookie", 0600, nsim_dev->ddir, 220 nsim_dev, &nsim_dev_trap_fa_cookie_fops); 221 debugfs_create_bool("fail_trap_group_set", 0600, 222 nsim_dev->ddir, 223 &nsim_dev->fail_trap_group_set); 224 debugfs_create_bool("fail_trap_policer_set", 0600, 225 nsim_dev->ddir, 226 &nsim_dev->fail_trap_policer_set); 227 debugfs_create_bool("fail_trap_policer_counter_get", 0600, 228 nsim_dev->ddir, 229 &nsim_dev->fail_trap_policer_counter_get); 230 nsim_udp_tunnels_debugfs_create(nsim_dev); 231 return 0; 232 } 233 234 static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev) 235 { 236 debugfs_remove_recursive(nsim_dev->ports_ddir); 237 debugfs_remove_recursive(nsim_dev->ddir); 238 } 239 240 static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev, 241 struct nsim_dev_port *nsim_dev_port) 242 { 243 char port_ddir_name[16]; 244 char dev_link_name[32]; 245 246 sprintf(port_ddir_name, "%u", nsim_dev_port->port_index); 247 nsim_dev_port->ddir = debugfs_create_dir(port_ddir_name, 248 nsim_dev->ports_ddir); 249 if (IS_ERR(nsim_dev_port->ddir)) 250 return PTR_ERR(nsim_dev_port->ddir); 251 252 sprintf(dev_link_name, "../../../" DRV_NAME "%u", 253 nsim_dev->nsim_bus_dev->dev.id); 254 debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name); 255 256 return 0; 257 } 258 259 static void nsim_dev_port_debugfs_exit(struct nsim_dev_port *nsim_dev_port) 260 { 261 debugfs_remove_recursive(nsim_dev_port->ddir); 262 } 263 264 static int nsim_dev_resources_register(struct devlink *devlink) 265 { 266 struct devlink_resource_size_params params = { 267 .size_max = (u64)-1, 268 .size_granularity = 1, 269 .unit = DEVLINK_RESOURCE_UNIT_ENTRY 270 }; 271 int err; 272 273 /* Resources for IPv4 */ 274 err = devlink_resource_register(devlink, "IPv4", (u64)-1, 275 NSIM_RESOURCE_IPV4, 276 DEVLINK_RESOURCE_ID_PARENT_TOP, 277 ¶ms); 278 if (err) { 279 pr_err("Failed to register IPv4 top resource\n"); 280 goto out; 281 } 282 283 err = devlink_resource_register(devlink, "fib", (u64)-1, 284 NSIM_RESOURCE_IPV4_FIB, 285 NSIM_RESOURCE_IPV4, ¶ms); 286 if (err) { 287 pr_err("Failed to register IPv4 FIB resource\n"); 288 return err; 289 } 290 291 err = devlink_resource_register(devlink, "fib-rules", (u64)-1, 292 NSIM_RESOURCE_IPV4_FIB_RULES, 293 NSIM_RESOURCE_IPV4, ¶ms); 294 if (err) { 295 pr_err("Failed to register IPv4 FIB rules resource\n"); 296 return err; 297 } 298 299 /* Resources for IPv6 */ 300 err = devlink_resource_register(devlink, "IPv6", (u64)-1, 301 NSIM_RESOURCE_IPV6, 302 DEVLINK_RESOURCE_ID_PARENT_TOP, 303 ¶ms); 304 if (err) { 305 pr_err("Failed to register IPv6 top resource\n"); 306 goto out; 307 } 308 309 err = devlink_resource_register(devlink, "fib", (u64)-1, 310 NSIM_RESOURCE_IPV6_FIB, 311 NSIM_RESOURCE_IPV6, ¶ms); 312 if (err) { 313 pr_err("Failed to register IPv6 FIB resource\n"); 314 return err; 315 } 316 317 err = devlink_resource_register(devlink, "fib-rules", (u64)-1, 318 NSIM_RESOURCE_IPV6_FIB_RULES, 319 NSIM_RESOURCE_IPV6, ¶ms); 320 if (err) { 321 pr_err("Failed to register IPv6 FIB rules resource\n"); 322 return err; 323 } 324 325 out: 326 return err; 327 } 328 329 enum nsim_devlink_param_id { 330 NSIM_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX, 331 NSIM_DEVLINK_PARAM_ID_TEST1, 332 }; 333 334 static const struct devlink_param nsim_devlink_params[] = { 335 DEVLINK_PARAM_GENERIC(MAX_MACS, 336 BIT(DEVLINK_PARAM_CMODE_DRIVERINIT), 337 NULL, NULL, NULL), 338 DEVLINK_PARAM_DRIVER(NSIM_DEVLINK_PARAM_ID_TEST1, 339 "test1", DEVLINK_PARAM_TYPE_BOOL, 340 BIT(DEVLINK_PARAM_CMODE_DRIVERINIT), 341 NULL, NULL, NULL), 342 }; 343 344 static void nsim_devlink_set_params_init_values(struct nsim_dev *nsim_dev, 345 struct devlink *devlink) 346 { 347 union devlink_param_value value; 348 349 value.vu32 = nsim_dev->max_macs; 350 devlink_param_driverinit_value_set(devlink, 351 DEVLINK_PARAM_GENERIC_ID_MAX_MACS, 352 value); 353 value.vbool = nsim_dev->test1; 354 devlink_param_driverinit_value_set(devlink, 355 NSIM_DEVLINK_PARAM_ID_TEST1, 356 value); 357 } 358 359 static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink) 360 { 361 struct nsim_dev *nsim_dev = devlink_priv(devlink); 362 union devlink_param_value saved_value; 363 int err; 364 365 err = devlink_param_driverinit_value_get(devlink, 366 DEVLINK_PARAM_GENERIC_ID_MAX_MACS, 367 &saved_value); 368 if (!err) 369 nsim_dev->max_macs = saved_value.vu32; 370 err = devlink_param_driverinit_value_get(devlink, 371 NSIM_DEVLINK_PARAM_ID_TEST1, 372 &saved_value); 373 if (!err) 374 nsim_dev->test1 = saved_value.vbool; 375 } 376 377 #define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16 378 379 static const struct devlink_region_ops dummy_region_ops = { 380 .name = "dummy", 381 .destructor = &kfree, 382 .snapshot = nsim_dev_take_snapshot, 383 }; 384 385 static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev, 386 struct devlink *devlink) 387 { 388 nsim_dev->dummy_region = 389 devlink_region_create(devlink, &dummy_region_ops, 390 NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX, 391 NSIM_DEV_DUMMY_REGION_SIZE); 392 return PTR_ERR_OR_ZERO(nsim_dev->dummy_region); 393 } 394 395 static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev) 396 { 397 devlink_region_destroy(nsim_dev->dummy_region); 398 } 399 400 struct nsim_trap_item { 401 void *trap_ctx; 402 enum devlink_trap_action action; 403 }; 404 405 struct nsim_trap_data { 406 struct delayed_work trap_report_dw; 407 struct nsim_trap_item *trap_items_arr; 408 u64 *trap_policers_cnt_arr; 409 struct nsim_dev *nsim_dev; 410 spinlock_t trap_lock; /* Protects trap_items_arr */ 411 }; 412 413 /* All driver-specific traps must be documented in 414 * Documentation/networking/devlink/netdevsim.rst 415 */ 416 enum { 417 NSIM_TRAP_ID_BASE = DEVLINK_TRAP_GENERIC_ID_MAX, 418 NSIM_TRAP_ID_FID_MISS, 419 }; 420 421 #define NSIM_TRAP_NAME_FID_MISS "fid_miss" 422 423 #define NSIM_TRAP_METADATA DEVLINK_TRAP_METADATA_TYPE_F_IN_PORT 424 425 #define NSIM_TRAP_DROP(_id, _group_id) \ 426 DEVLINK_TRAP_GENERIC(DROP, DROP, _id, \ 427 DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \ 428 NSIM_TRAP_METADATA) 429 #define NSIM_TRAP_DROP_EXT(_id, _group_id, _metadata) \ 430 DEVLINK_TRAP_GENERIC(DROP, DROP, _id, \ 431 DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \ 432 NSIM_TRAP_METADATA | (_metadata)) 433 #define NSIM_TRAP_EXCEPTION(_id, _group_id) \ 434 DEVLINK_TRAP_GENERIC(EXCEPTION, TRAP, _id, \ 435 DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \ 436 NSIM_TRAP_METADATA) 437 #define NSIM_TRAP_CONTROL(_id, _group_id, _action) \ 438 DEVLINK_TRAP_GENERIC(CONTROL, _action, _id, \ 439 DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \ 440 NSIM_TRAP_METADATA) 441 #define NSIM_TRAP_DRIVER_EXCEPTION(_id, _group_id) \ 442 DEVLINK_TRAP_DRIVER(EXCEPTION, TRAP, NSIM_TRAP_ID_##_id, \ 443 NSIM_TRAP_NAME_##_id, \ 444 DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \ 445 NSIM_TRAP_METADATA) 446 447 #define NSIM_DEV_TRAP_POLICER_MIN_RATE 1 448 #define NSIM_DEV_TRAP_POLICER_MAX_RATE 8000 449 #define NSIM_DEV_TRAP_POLICER_MIN_BURST 8 450 #define NSIM_DEV_TRAP_POLICER_MAX_BURST 65536 451 452 #define NSIM_TRAP_POLICER(_id, _rate, _burst) \ 453 DEVLINK_TRAP_POLICER(_id, _rate, _burst, \ 454 NSIM_DEV_TRAP_POLICER_MAX_RATE, \ 455 NSIM_DEV_TRAP_POLICER_MIN_RATE, \ 456 NSIM_DEV_TRAP_POLICER_MAX_BURST, \ 457 NSIM_DEV_TRAP_POLICER_MIN_BURST) 458 459 static const struct devlink_trap_policer nsim_trap_policers_arr[] = { 460 NSIM_TRAP_POLICER(1, 1000, 128), 461 NSIM_TRAP_POLICER(2, 2000, 256), 462 NSIM_TRAP_POLICER(3, 3000, 512), 463 }; 464 465 static const struct devlink_trap_group nsim_trap_groups_arr[] = { 466 DEVLINK_TRAP_GROUP_GENERIC(L2_DROPS, 0), 467 DEVLINK_TRAP_GROUP_GENERIC(L3_DROPS, 1), 468 DEVLINK_TRAP_GROUP_GENERIC(L3_EXCEPTIONS, 1), 469 DEVLINK_TRAP_GROUP_GENERIC(BUFFER_DROPS, 2), 470 DEVLINK_TRAP_GROUP_GENERIC(ACL_DROPS, 3), 471 DEVLINK_TRAP_GROUP_GENERIC(MC_SNOOPING, 3), 472 }; 473 474 static const struct devlink_trap nsim_traps_arr[] = { 475 NSIM_TRAP_DROP(SMAC_MC, L2_DROPS), 476 NSIM_TRAP_DROP(VLAN_TAG_MISMATCH, L2_DROPS), 477 NSIM_TRAP_DROP(INGRESS_VLAN_FILTER, L2_DROPS), 478 NSIM_TRAP_DROP(INGRESS_STP_FILTER, L2_DROPS), 479 NSIM_TRAP_DROP(EMPTY_TX_LIST, L2_DROPS), 480 NSIM_TRAP_DROP(PORT_LOOPBACK_FILTER, L2_DROPS), 481 NSIM_TRAP_DRIVER_EXCEPTION(FID_MISS, L2_DROPS), 482 NSIM_TRAP_DROP(BLACKHOLE_ROUTE, L3_DROPS), 483 NSIM_TRAP_EXCEPTION(TTL_ERROR, L3_EXCEPTIONS), 484 NSIM_TRAP_DROP(TAIL_DROP, BUFFER_DROPS), 485 NSIM_TRAP_DROP_EXT(INGRESS_FLOW_ACTION_DROP, ACL_DROPS, 486 DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE), 487 NSIM_TRAP_DROP_EXT(EGRESS_FLOW_ACTION_DROP, ACL_DROPS, 488 DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE), 489 NSIM_TRAP_CONTROL(IGMP_QUERY, MC_SNOOPING, MIRROR), 490 NSIM_TRAP_CONTROL(IGMP_V1_REPORT, MC_SNOOPING, TRAP), 491 }; 492 493 #define NSIM_TRAP_L4_DATA_LEN 100 494 495 static struct sk_buff *nsim_dev_trap_skb_build(void) 496 { 497 int tot_len, data_len = NSIM_TRAP_L4_DATA_LEN; 498 struct sk_buff *skb; 499 struct udphdr *udph; 500 struct ethhdr *eth; 501 struct iphdr *iph; 502 503 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 504 if (!skb) 505 return NULL; 506 tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + data_len; 507 508 skb_reset_mac_header(skb); 509 eth = skb_put(skb, sizeof(struct ethhdr)); 510 eth_random_addr(eth->h_dest); 511 eth_random_addr(eth->h_source); 512 eth->h_proto = htons(ETH_P_IP); 513 skb->protocol = htons(ETH_P_IP); 514 515 skb_set_network_header(skb, skb->len); 516 iph = skb_put(skb, sizeof(struct iphdr)); 517 iph->protocol = IPPROTO_UDP; 518 iph->saddr = in_aton("192.0.2.1"); 519 iph->daddr = in_aton("198.51.100.1"); 520 iph->version = 0x4; 521 iph->frag_off = 0; 522 iph->ihl = 0x5; 523 iph->tot_len = htons(tot_len); 524 iph->ttl = 100; 525 iph->check = 0; 526 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 527 528 skb_set_transport_header(skb, skb->len); 529 udph = skb_put_zero(skb, sizeof(struct udphdr) + data_len); 530 get_random_bytes(&udph->source, sizeof(u16)); 531 get_random_bytes(&udph->dest, sizeof(u16)); 532 udph->len = htons(sizeof(struct udphdr) + data_len); 533 534 return skb; 535 } 536 537 static void nsim_dev_trap_report(struct nsim_dev_port *nsim_dev_port) 538 { 539 struct nsim_dev *nsim_dev = nsim_dev_port->ns->nsim_dev; 540 struct devlink *devlink = priv_to_devlink(nsim_dev); 541 struct nsim_trap_data *nsim_trap_data; 542 int i; 543 544 nsim_trap_data = nsim_dev->trap_data; 545 546 spin_lock(&nsim_trap_data->trap_lock); 547 for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) { 548 struct flow_action_cookie *fa_cookie = NULL; 549 struct nsim_trap_item *nsim_trap_item; 550 struct sk_buff *skb; 551 bool has_fa_cookie; 552 553 has_fa_cookie = nsim_traps_arr[i].metadata_cap & 554 DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE; 555 556 nsim_trap_item = &nsim_trap_data->trap_items_arr[i]; 557 if (nsim_trap_item->action == DEVLINK_TRAP_ACTION_DROP) 558 continue; 559 560 skb = nsim_dev_trap_skb_build(); 561 if (!skb) 562 continue; 563 skb->dev = nsim_dev_port->ns->netdev; 564 565 /* Trapped packets are usually passed to devlink in softIRQ, 566 * but in this case they are generated in a workqueue. Disable 567 * softIRQs to prevent lockdep from complaining about 568 * "incosistent lock state". 569 */ 570 571 spin_lock_bh(&nsim_dev->fa_cookie_lock); 572 fa_cookie = has_fa_cookie ? nsim_dev->fa_cookie : NULL; 573 devlink_trap_report(devlink, skb, nsim_trap_item->trap_ctx, 574 &nsim_dev_port->devlink_port, fa_cookie); 575 spin_unlock_bh(&nsim_dev->fa_cookie_lock); 576 consume_skb(skb); 577 } 578 spin_unlock(&nsim_trap_data->trap_lock); 579 } 580 581 #define NSIM_TRAP_REPORT_INTERVAL_MS 100 582 583 static void nsim_dev_trap_report_work(struct work_struct *work) 584 { 585 struct nsim_trap_data *nsim_trap_data; 586 struct nsim_dev_port *nsim_dev_port; 587 struct nsim_dev *nsim_dev; 588 589 nsim_trap_data = container_of(work, struct nsim_trap_data, 590 trap_report_dw.work); 591 nsim_dev = nsim_trap_data->nsim_dev; 592 593 /* For each running port and enabled packet trap, generate a UDP 594 * packet with a random 5-tuple and report it. 595 */ 596 mutex_lock(&nsim_dev->port_list_lock); 597 list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list) { 598 if (!netif_running(nsim_dev_port->ns->netdev)) 599 continue; 600 601 nsim_dev_trap_report(nsim_dev_port); 602 } 603 mutex_unlock(&nsim_dev->port_list_lock); 604 605 schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw, 606 msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS)); 607 } 608 609 static int nsim_dev_traps_init(struct devlink *devlink) 610 { 611 size_t policers_count = ARRAY_SIZE(nsim_trap_policers_arr); 612 struct nsim_dev *nsim_dev = devlink_priv(devlink); 613 struct nsim_trap_data *nsim_trap_data; 614 int err; 615 616 nsim_trap_data = kzalloc(sizeof(*nsim_trap_data), GFP_KERNEL); 617 if (!nsim_trap_data) 618 return -ENOMEM; 619 620 nsim_trap_data->trap_items_arr = kcalloc(ARRAY_SIZE(nsim_traps_arr), 621 sizeof(struct nsim_trap_item), 622 GFP_KERNEL); 623 if (!nsim_trap_data->trap_items_arr) { 624 err = -ENOMEM; 625 goto err_trap_data_free; 626 } 627 628 nsim_trap_data->trap_policers_cnt_arr = kcalloc(policers_count, 629 sizeof(u64), 630 GFP_KERNEL); 631 if (!nsim_trap_data->trap_policers_cnt_arr) { 632 err = -ENOMEM; 633 goto err_trap_items_free; 634 } 635 636 /* The lock is used to protect the action state of the registered 637 * traps. The value is written by user and read in delayed work when 638 * iterating over all the traps. 639 */ 640 spin_lock_init(&nsim_trap_data->trap_lock); 641 nsim_trap_data->nsim_dev = nsim_dev; 642 nsim_dev->trap_data = nsim_trap_data; 643 644 err = devlink_trap_policers_register(devlink, nsim_trap_policers_arr, 645 policers_count); 646 if (err) 647 goto err_trap_policers_cnt_free; 648 649 err = devlink_trap_groups_register(devlink, nsim_trap_groups_arr, 650 ARRAY_SIZE(nsim_trap_groups_arr)); 651 if (err) 652 goto err_trap_policers_unregister; 653 654 err = devlink_traps_register(devlink, nsim_traps_arr, 655 ARRAY_SIZE(nsim_traps_arr), NULL); 656 if (err) 657 goto err_trap_groups_unregister; 658 659 INIT_DELAYED_WORK(&nsim_dev->trap_data->trap_report_dw, 660 nsim_dev_trap_report_work); 661 schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw, 662 msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS)); 663 664 return 0; 665 666 err_trap_groups_unregister: 667 devlink_trap_groups_unregister(devlink, nsim_trap_groups_arr, 668 ARRAY_SIZE(nsim_trap_groups_arr)); 669 err_trap_policers_unregister: 670 devlink_trap_policers_unregister(devlink, nsim_trap_policers_arr, 671 ARRAY_SIZE(nsim_trap_policers_arr)); 672 err_trap_policers_cnt_free: 673 kfree(nsim_trap_data->trap_policers_cnt_arr); 674 err_trap_items_free: 675 kfree(nsim_trap_data->trap_items_arr); 676 err_trap_data_free: 677 kfree(nsim_trap_data); 678 return err; 679 } 680 681 static void nsim_dev_traps_exit(struct devlink *devlink) 682 { 683 struct nsim_dev *nsim_dev = devlink_priv(devlink); 684 685 cancel_delayed_work_sync(&nsim_dev->trap_data->trap_report_dw); 686 devlink_traps_unregister(devlink, nsim_traps_arr, 687 ARRAY_SIZE(nsim_traps_arr)); 688 devlink_trap_groups_unregister(devlink, nsim_trap_groups_arr, 689 ARRAY_SIZE(nsim_trap_groups_arr)); 690 devlink_trap_policers_unregister(devlink, nsim_trap_policers_arr, 691 ARRAY_SIZE(nsim_trap_policers_arr)); 692 kfree(nsim_dev->trap_data->trap_policers_cnt_arr); 693 kfree(nsim_dev->trap_data->trap_items_arr); 694 kfree(nsim_dev->trap_data); 695 } 696 697 static int nsim_dev_reload_create(struct nsim_dev *nsim_dev, 698 struct netlink_ext_ack *extack); 699 static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev); 700 701 static int nsim_dev_reload_down(struct devlink *devlink, bool netns_change, 702 struct netlink_ext_ack *extack) 703 { 704 struct nsim_dev *nsim_dev = devlink_priv(devlink); 705 706 if (nsim_dev->dont_allow_reload) { 707 /* For testing purposes, user set debugfs dont_allow_reload 708 * value to true. So forbid it. 709 */ 710 NL_SET_ERR_MSG_MOD(extack, "User forbid the reload for testing purposes"); 711 return -EOPNOTSUPP; 712 } 713 714 nsim_dev_reload_destroy(nsim_dev); 715 return 0; 716 } 717 718 static int nsim_dev_reload_up(struct devlink *devlink, 719 struct netlink_ext_ack *extack) 720 { 721 struct nsim_dev *nsim_dev = devlink_priv(devlink); 722 723 if (nsim_dev->fail_reload) { 724 /* For testing purposes, user set debugfs fail_reload 725 * value to true. Fail right away. 726 */ 727 NL_SET_ERR_MSG_MOD(extack, "User setup the reload to fail for testing purposes"); 728 return -EINVAL; 729 } 730 731 return nsim_dev_reload_create(nsim_dev, extack); 732 } 733 734 static int nsim_dev_info_get(struct devlink *devlink, 735 struct devlink_info_req *req, 736 struct netlink_ext_ack *extack) 737 { 738 return devlink_info_driver_name_put(req, DRV_NAME); 739 } 740 741 #define NSIM_DEV_FLASH_SIZE 500000 742 #define NSIM_DEV_FLASH_CHUNK_SIZE 1000 743 #define NSIM_DEV_FLASH_CHUNK_TIME_MS 10 744 745 static int nsim_dev_flash_update(struct devlink *devlink, const char *file_name, 746 const char *component, 747 struct netlink_ext_ack *extack) 748 { 749 struct nsim_dev *nsim_dev = devlink_priv(devlink); 750 int i; 751 752 if (nsim_dev->fw_update_status) { 753 devlink_flash_update_begin_notify(devlink); 754 devlink_flash_update_status_notify(devlink, 755 "Preparing to flash", 756 component, 0, 0); 757 } 758 759 for (i = 0; i < NSIM_DEV_FLASH_SIZE / NSIM_DEV_FLASH_CHUNK_SIZE; i++) { 760 if (nsim_dev->fw_update_status) 761 devlink_flash_update_status_notify(devlink, "Flashing", 762 component, 763 i * NSIM_DEV_FLASH_CHUNK_SIZE, 764 NSIM_DEV_FLASH_SIZE); 765 msleep(NSIM_DEV_FLASH_CHUNK_TIME_MS); 766 } 767 768 if (nsim_dev->fw_update_status) { 769 devlink_flash_update_status_notify(devlink, "Flashing", 770 component, 771 NSIM_DEV_FLASH_SIZE, 772 NSIM_DEV_FLASH_SIZE); 773 devlink_flash_update_timeout_notify(devlink, "Flash select", 774 component, 81); 775 devlink_flash_update_status_notify(devlink, "Flashing done", 776 component, 0, 0); 777 devlink_flash_update_end_notify(devlink); 778 } 779 780 return 0; 781 } 782 783 static struct nsim_trap_item * 784 nsim_dev_trap_item_lookup(struct nsim_dev *nsim_dev, u16 trap_id) 785 { 786 struct nsim_trap_data *nsim_trap_data = nsim_dev->trap_data; 787 int i; 788 789 for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) { 790 if (nsim_traps_arr[i].id == trap_id) 791 return &nsim_trap_data->trap_items_arr[i]; 792 } 793 794 return NULL; 795 } 796 797 static int nsim_dev_devlink_trap_init(struct devlink *devlink, 798 const struct devlink_trap *trap, 799 void *trap_ctx) 800 { 801 struct nsim_dev *nsim_dev = devlink_priv(devlink); 802 struct nsim_trap_item *nsim_trap_item; 803 804 nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id); 805 if (WARN_ON(!nsim_trap_item)) 806 return -ENOENT; 807 808 nsim_trap_item->trap_ctx = trap_ctx; 809 nsim_trap_item->action = trap->init_action; 810 811 return 0; 812 } 813 814 static int 815 nsim_dev_devlink_trap_action_set(struct devlink *devlink, 816 const struct devlink_trap *trap, 817 enum devlink_trap_action action, 818 struct netlink_ext_ack *extack) 819 { 820 struct nsim_dev *nsim_dev = devlink_priv(devlink); 821 struct nsim_trap_item *nsim_trap_item; 822 823 nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id); 824 if (WARN_ON(!nsim_trap_item)) 825 return -ENOENT; 826 827 spin_lock(&nsim_dev->trap_data->trap_lock); 828 nsim_trap_item->action = action; 829 spin_unlock(&nsim_dev->trap_data->trap_lock); 830 831 return 0; 832 } 833 834 static int 835 nsim_dev_devlink_trap_group_set(struct devlink *devlink, 836 const struct devlink_trap_group *group, 837 const struct devlink_trap_policer *policer, 838 struct netlink_ext_ack *extack) 839 { 840 struct nsim_dev *nsim_dev = devlink_priv(devlink); 841 842 if (nsim_dev->fail_trap_group_set) 843 return -EINVAL; 844 845 return 0; 846 } 847 848 static int 849 nsim_dev_devlink_trap_policer_set(struct devlink *devlink, 850 const struct devlink_trap_policer *policer, 851 u64 rate, u64 burst, 852 struct netlink_ext_ack *extack) 853 { 854 struct nsim_dev *nsim_dev = devlink_priv(devlink); 855 856 if (nsim_dev->fail_trap_policer_set) { 857 NL_SET_ERR_MSG_MOD(extack, "User setup the operation to fail for testing purposes"); 858 return -EINVAL; 859 } 860 861 return 0; 862 } 863 864 static int 865 nsim_dev_devlink_trap_policer_counter_get(struct devlink *devlink, 866 const struct devlink_trap_policer *policer, 867 u64 *p_drops) 868 { 869 struct nsim_dev *nsim_dev = devlink_priv(devlink); 870 u64 *cnt; 871 872 if (nsim_dev->fail_trap_policer_counter_get) 873 return -EINVAL; 874 875 cnt = &nsim_dev->trap_data->trap_policers_cnt_arr[policer->id - 1]; 876 *p_drops = (*cnt)++; 877 878 return 0; 879 } 880 881 static const struct devlink_ops nsim_dev_devlink_ops = { 882 .reload_down = nsim_dev_reload_down, 883 .reload_up = nsim_dev_reload_up, 884 .info_get = nsim_dev_info_get, 885 .flash_update = nsim_dev_flash_update, 886 .trap_init = nsim_dev_devlink_trap_init, 887 .trap_action_set = nsim_dev_devlink_trap_action_set, 888 .trap_group_set = nsim_dev_devlink_trap_group_set, 889 .trap_policer_set = nsim_dev_devlink_trap_policer_set, 890 .trap_policer_counter_get = nsim_dev_devlink_trap_policer_counter_get, 891 }; 892 893 #define NSIM_DEV_MAX_MACS_DEFAULT 32 894 #define NSIM_DEV_TEST1_DEFAULT true 895 896 static int __nsim_dev_port_add(struct nsim_dev *nsim_dev, 897 unsigned int port_index) 898 { 899 struct devlink_port_attrs attrs = {}; 900 struct nsim_dev_port *nsim_dev_port; 901 struct devlink_port *devlink_port; 902 int err; 903 904 nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL); 905 if (!nsim_dev_port) 906 return -ENOMEM; 907 nsim_dev_port->port_index = port_index; 908 909 devlink_port = &nsim_dev_port->devlink_port; 910 attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL; 911 attrs.phys.port_number = port_index + 1; 912 memcpy(attrs.switch_id.id, nsim_dev->switch_id.id, nsim_dev->switch_id.id_len); 913 attrs.switch_id.id_len = nsim_dev->switch_id.id_len; 914 devlink_port_attrs_set(devlink_port, &attrs); 915 err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port, 916 port_index); 917 if (err) 918 goto err_port_free; 919 920 err = nsim_dev_port_debugfs_init(nsim_dev, nsim_dev_port); 921 if (err) 922 goto err_dl_port_unregister; 923 924 nsim_dev_port->ns = nsim_create(nsim_dev, nsim_dev_port); 925 if (IS_ERR(nsim_dev_port->ns)) { 926 err = PTR_ERR(nsim_dev_port->ns); 927 goto err_port_debugfs_exit; 928 } 929 930 devlink_port_type_eth_set(devlink_port, nsim_dev_port->ns->netdev); 931 list_add(&nsim_dev_port->list, &nsim_dev->port_list); 932 933 return 0; 934 935 err_port_debugfs_exit: 936 nsim_dev_port_debugfs_exit(nsim_dev_port); 937 err_dl_port_unregister: 938 devlink_port_unregister(devlink_port); 939 err_port_free: 940 kfree(nsim_dev_port); 941 return err; 942 } 943 944 static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port) 945 { 946 struct devlink_port *devlink_port = &nsim_dev_port->devlink_port; 947 948 list_del(&nsim_dev_port->list); 949 devlink_port_type_clear(devlink_port); 950 nsim_destroy(nsim_dev_port->ns); 951 nsim_dev_port_debugfs_exit(nsim_dev_port); 952 devlink_port_unregister(devlink_port); 953 kfree(nsim_dev_port); 954 } 955 956 static void nsim_dev_port_del_all(struct nsim_dev *nsim_dev) 957 { 958 struct nsim_dev_port *nsim_dev_port, *tmp; 959 960 mutex_lock(&nsim_dev->port_list_lock); 961 list_for_each_entry_safe(nsim_dev_port, tmp, 962 &nsim_dev->port_list, list) 963 __nsim_dev_port_del(nsim_dev_port); 964 mutex_unlock(&nsim_dev->port_list_lock); 965 } 966 967 static int nsim_dev_port_add_all(struct nsim_dev *nsim_dev, 968 unsigned int port_count) 969 { 970 int i, err; 971 972 for (i = 0; i < port_count; i++) { 973 err = __nsim_dev_port_add(nsim_dev, i); 974 if (err) 975 goto err_port_del_all; 976 } 977 return 0; 978 979 err_port_del_all: 980 nsim_dev_port_del_all(nsim_dev); 981 return err; 982 } 983 984 static int nsim_dev_reload_create(struct nsim_dev *nsim_dev, 985 struct netlink_ext_ack *extack) 986 { 987 struct nsim_bus_dev *nsim_bus_dev = nsim_dev->nsim_bus_dev; 988 struct devlink *devlink; 989 int err; 990 991 devlink = priv_to_devlink(nsim_dev); 992 nsim_dev = devlink_priv(devlink); 993 INIT_LIST_HEAD(&nsim_dev->port_list); 994 mutex_init(&nsim_dev->port_list_lock); 995 nsim_dev->fw_update_status = true; 996 997 nsim_dev->fib_data = nsim_fib_create(devlink, extack); 998 if (IS_ERR(nsim_dev->fib_data)) 999 return PTR_ERR(nsim_dev->fib_data); 1000 1001 nsim_devlink_param_load_driverinit_values(devlink); 1002 1003 err = nsim_dev_dummy_region_init(nsim_dev, devlink); 1004 if (err) 1005 goto err_fib_destroy; 1006 1007 err = nsim_dev_traps_init(devlink); 1008 if (err) 1009 goto err_dummy_region_exit; 1010 1011 err = nsim_dev_health_init(nsim_dev, devlink); 1012 if (err) 1013 goto err_traps_exit; 1014 1015 err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count); 1016 if (err) 1017 goto err_health_exit; 1018 1019 nsim_dev->take_snapshot = debugfs_create_file("take_snapshot", 1020 0200, 1021 nsim_dev->ddir, 1022 nsim_dev, 1023 &nsim_dev_take_snapshot_fops); 1024 return 0; 1025 1026 err_health_exit: 1027 nsim_dev_health_exit(nsim_dev); 1028 err_traps_exit: 1029 nsim_dev_traps_exit(devlink); 1030 err_dummy_region_exit: 1031 nsim_dev_dummy_region_exit(nsim_dev); 1032 err_fib_destroy: 1033 nsim_fib_destroy(devlink, nsim_dev->fib_data); 1034 return err; 1035 } 1036 1037 int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev) 1038 { 1039 struct nsim_dev *nsim_dev; 1040 struct devlink *devlink; 1041 int err; 1042 1043 devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev)); 1044 if (!devlink) 1045 return -ENOMEM; 1046 devlink_net_set(devlink, nsim_bus_dev->initial_net); 1047 nsim_dev = devlink_priv(devlink); 1048 nsim_dev->nsim_bus_dev = nsim_bus_dev; 1049 nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id); 1050 get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len); 1051 INIT_LIST_HEAD(&nsim_dev->port_list); 1052 mutex_init(&nsim_dev->port_list_lock); 1053 nsim_dev->fw_update_status = true; 1054 nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT; 1055 nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT; 1056 spin_lock_init(&nsim_dev->fa_cookie_lock); 1057 1058 dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev); 1059 1060 err = nsim_dev_resources_register(devlink); 1061 if (err) 1062 goto err_devlink_free; 1063 1064 nsim_dev->fib_data = nsim_fib_create(devlink, NULL); 1065 if (IS_ERR(nsim_dev->fib_data)) { 1066 err = PTR_ERR(nsim_dev->fib_data); 1067 goto err_resources_unregister; 1068 } 1069 1070 err = devlink_register(devlink, &nsim_bus_dev->dev); 1071 if (err) 1072 goto err_fib_destroy; 1073 1074 err = devlink_params_register(devlink, nsim_devlink_params, 1075 ARRAY_SIZE(nsim_devlink_params)); 1076 if (err) 1077 goto err_dl_unregister; 1078 nsim_devlink_set_params_init_values(nsim_dev, devlink); 1079 1080 err = nsim_dev_dummy_region_init(nsim_dev, devlink); 1081 if (err) 1082 goto err_params_unregister; 1083 1084 err = nsim_dev_traps_init(devlink); 1085 if (err) 1086 goto err_dummy_region_exit; 1087 1088 err = nsim_dev_debugfs_init(nsim_dev); 1089 if (err) 1090 goto err_traps_exit; 1091 1092 err = nsim_dev_health_init(nsim_dev, devlink); 1093 if (err) 1094 goto err_debugfs_exit; 1095 1096 err = nsim_bpf_dev_init(nsim_dev); 1097 if (err) 1098 goto err_health_exit; 1099 1100 err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count); 1101 if (err) 1102 goto err_bpf_dev_exit; 1103 1104 devlink_params_publish(devlink); 1105 devlink_reload_enable(devlink); 1106 return 0; 1107 1108 err_bpf_dev_exit: 1109 nsim_bpf_dev_exit(nsim_dev); 1110 err_health_exit: 1111 nsim_dev_health_exit(nsim_dev); 1112 err_debugfs_exit: 1113 nsim_dev_debugfs_exit(nsim_dev); 1114 err_traps_exit: 1115 nsim_dev_traps_exit(devlink); 1116 err_dummy_region_exit: 1117 nsim_dev_dummy_region_exit(nsim_dev); 1118 err_params_unregister: 1119 devlink_params_unregister(devlink, nsim_devlink_params, 1120 ARRAY_SIZE(nsim_devlink_params)); 1121 err_dl_unregister: 1122 devlink_unregister(devlink); 1123 err_fib_destroy: 1124 nsim_fib_destroy(devlink, nsim_dev->fib_data); 1125 err_resources_unregister: 1126 devlink_resources_unregister(devlink, NULL); 1127 err_devlink_free: 1128 devlink_free(devlink); 1129 return err; 1130 } 1131 1132 static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev) 1133 { 1134 struct devlink *devlink = priv_to_devlink(nsim_dev); 1135 1136 if (devlink_is_reload_failed(devlink)) 1137 return; 1138 debugfs_remove(nsim_dev->take_snapshot); 1139 nsim_dev_port_del_all(nsim_dev); 1140 nsim_dev_health_exit(nsim_dev); 1141 nsim_dev_traps_exit(devlink); 1142 nsim_dev_dummy_region_exit(nsim_dev); 1143 mutex_destroy(&nsim_dev->port_list_lock); 1144 nsim_fib_destroy(devlink, nsim_dev->fib_data); 1145 } 1146 1147 void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev) 1148 { 1149 struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev); 1150 struct devlink *devlink = priv_to_devlink(nsim_dev); 1151 1152 devlink_reload_disable(devlink); 1153 1154 nsim_dev_reload_destroy(nsim_dev); 1155 1156 nsim_bpf_dev_exit(nsim_dev); 1157 nsim_dev_debugfs_exit(nsim_dev); 1158 devlink_params_unregister(devlink, nsim_devlink_params, 1159 ARRAY_SIZE(nsim_devlink_params)); 1160 devlink_unregister(devlink); 1161 devlink_resources_unregister(devlink, NULL); 1162 devlink_free(devlink); 1163 } 1164 1165 static struct nsim_dev_port * 1166 __nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index) 1167 { 1168 struct nsim_dev_port *nsim_dev_port; 1169 1170 list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list) 1171 if (nsim_dev_port->port_index == port_index) 1172 return nsim_dev_port; 1173 return NULL; 1174 } 1175 1176 int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev, 1177 unsigned int port_index) 1178 { 1179 struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev); 1180 int err; 1181 1182 mutex_lock(&nsim_dev->port_list_lock); 1183 if (__nsim_dev_port_lookup(nsim_dev, port_index)) 1184 err = -EEXIST; 1185 else 1186 err = __nsim_dev_port_add(nsim_dev, port_index); 1187 mutex_unlock(&nsim_dev->port_list_lock); 1188 return err; 1189 } 1190 1191 int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev, 1192 unsigned int port_index) 1193 { 1194 struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev); 1195 struct nsim_dev_port *nsim_dev_port; 1196 int err = 0; 1197 1198 mutex_lock(&nsim_dev->port_list_lock); 1199 nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, port_index); 1200 if (!nsim_dev_port) 1201 err = -ENOENT; 1202 else 1203 __nsim_dev_port_del(nsim_dev_port); 1204 mutex_unlock(&nsim_dev->port_list_lock); 1205 return err; 1206 } 1207 1208 int nsim_dev_init(void) 1209 { 1210 nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL); 1211 return PTR_ERR_OR_ZERO(nsim_dev_ddir); 1212 } 1213 1214 void nsim_dev_exit(void) 1215 { 1216 debugfs_remove_recursive(nsim_dev_ddir); 1217 } 1218