1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <linux/netdevice.h> 4 #include <linux/notifier.h> 5 #include <linux/rtnetlink.h> 6 #include <net/busy_poll.h> 7 #include <net/net_namespace.h> 8 #include <net/netdev_queues.h> 9 #include <net/netdev_rx_queue.h> 10 #include <net/sock.h> 11 #include <net/xdp.h> 12 #include <net/xdp_sock.h> 13 #include <net/page_pool/memory_provider.h> 14 15 #include "dev.h" 16 #include "devmem.h" 17 #include "netdev-genl-gen.h" 18 19 struct netdev_nl_dump_ctx { 20 unsigned long ifindex; 21 unsigned int rxq_idx; 22 unsigned int txq_idx; 23 unsigned int napi_id; 24 }; 25 26 static struct netdev_nl_dump_ctx *netdev_dump_ctx(struct netlink_callback *cb) 27 { 28 NL_ASSERT_CTX_FITS(struct netdev_nl_dump_ctx); 29 30 return (struct netdev_nl_dump_ctx *)cb->ctx; 31 } 32 33 static int 34 netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp, 35 const struct genl_info *info) 36 { 37 u64 xsk_features = 0; 38 u64 xdp_rx_meta = 0; 39 void *hdr; 40 41 hdr = genlmsg_iput(rsp, info); 42 if (!hdr) 43 return -EMSGSIZE; 44 45 #define XDP_METADATA_KFUNC(_, flag, __, xmo) \ 46 if (netdev->xdp_metadata_ops && netdev->xdp_metadata_ops->xmo) \ 47 xdp_rx_meta |= flag; 48 XDP_METADATA_KFUNC_xxx 49 #undef XDP_METADATA_KFUNC 50 51 if (netdev->xsk_tx_metadata_ops) { 52 if (netdev->xsk_tx_metadata_ops->tmo_fill_timestamp) 53 xsk_features |= NETDEV_XSK_FLAGS_TX_TIMESTAMP; 54 if (netdev->xsk_tx_metadata_ops->tmo_request_checksum) 55 xsk_features |= NETDEV_XSK_FLAGS_TX_CHECKSUM; 56 } 57 58 if (nla_put_u32(rsp, NETDEV_A_DEV_IFINDEX, netdev->ifindex) || 59 nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_FEATURES, 60 netdev->xdp_features, NETDEV_A_DEV_PAD) || 61 nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_RX_METADATA_FEATURES, 62 xdp_rx_meta, NETDEV_A_DEV_PAD) || 63 nla_put_u64_64bit(rsp, NETDEV_A_DEV_XSK_FEATURES, 64 xsk_features, NETDEV_A_DEV_PAD)) 65 goto err_cancel_msg; 66 67 if (netdev->xdp_features & NETDEV_XDP_ACT_XSK_ZEROCOPY) { 68 if (nla_put_u32(rsp, NETDEV_A_DEV_XDP_ZC_MAX_SEGS, 69 netdev->xdp_zc_max_segs)) 70 goto err_cancel_msg; 71 } 72 73 genlmsg_end(rsp, hdr); 74 75 return 0; 76 77 err_cancel_msg: 78 genlmsg_cancel(rsp, hdr); 79 return -EMSGSIZE; 80 } 81 82 static void 83 netdev_genl_dev_notify(struct net_device *netdev, int cmd) 84 { 85 struct genl_info info; 86 struct sk_buff *ntf; 87 88 if (!genl_has_listeners(&netdev_nl_family, dev_net(netdev), 89 NETDEV_NLGRP_MGMT)) 90 return; 91 92 genl_info_init_ntf(&info, &netdev_nl_family, cmd); 93 94 ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); 95 if (!ntf) 96 return; 97 98 if (netdev_nl_dev_fill(netdev, ntf, &info)) { 99 nlmsg_free(ntf); 100 return; 101 } 102 103 genlmsg_multicast_netns(&netdev_nl_family, dev_net(netdev), ntf, 104 0, NETDEV_NLGRP_MGMT, GFP_KERNEL); 105 } 106 107 int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info) 108 { 109 struct net_device *netdev; 110 struct sk_buff *rsp; 111 u32 ifindex; 112 int err; 113 114 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_DEV_IFINDEX)) 115 return -EINVAL; 116 117 ifindex = nla_get_u32(info->attrs[NETDEV_A_DEV_IFINDEX]); 118 119 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); 120 if (!rsp) 121 return -ENOMEM; 122 123 rtnl_lock(); 124 125 netdev = __dev_get_by_index(genl_info_net(info), ifindex); 126 if (netdev) 127 err = netdev_nl_dev_fill(netdev, rsp, info); 128 else 129 err = -ENODEV; 130 131 rtnl_unlock(); 132 133 if (err) 134 goto err_free_msg; 135 136 return genlmsg_reply(rsp, info); 137 138 err_free_msg: 139 nlmsg_free(rsp); 140 return err; 141 } 142 143 int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) 144 { 145 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb); 146 struct net *net = sock_net(skb->sk); 147 struct net_device *netdev; 148 int err = 0; 149 150 rtnl_lock(); 151 for_each_netdev_dump(net, netdev, ctx->ifindex) { 152 err = netdev_nl_dev_fill(netdev, skb, genl_info_dump(cb)); 153 if (err < 0) 154 break; 155 } 156 rtnl_unlock(); 157 158 return err; 159 } 160 161 static int 162 netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi, 163 const struct genl_info *info) 164 { 165 unsigned long irq_suspend_timeout; 166 unsigned long gro_flush_timeout; 167 u32 napi_defer_hard_irqs; 168 void *hdr; 169 pid_t pid; 170 171 if (!napi->dev->up) 172 return 0; 173 174 hdr = genlmsg_iput(rsp, info); 175 if (!hdr) 176 return -EMSGSIZE; 177 178 if (nla_put_u32(rsp, NETDEV_A_NAPI_ID, napi->napi_id)) 179 goto nla_put_failure; 180 181 if (nla_put_u32(rsp, NETDEV_A_NAPI_IFINDEX, napi->dev->ifindex)) 182 goto nla_put_failure; 183 184 if (napi->irq >= 0 && nla_put_u32(rsp, NETDEV_A_NAPI_IRQ, napi->irq)) 185 goto nla_put_failure; 186 187 if (napi->thread) { 188 pid = task_pid_nr(napi->thread); 189 if (nla_put_u32(rsp, NETDEV_A_NAPI_PID, pid)) 190 goto nla_put_failure; 191 } 192 193 napi_defer_hard_irqs = napi_get_defer_hard_irqs(napi); 194 if (nla_put_s32(rsp, NETDEV_A_NAPI_DEFER_HARD_IRQS, 195 napi_defer_hard_irqs)) 196 goto nla_put_failure; 197 198 irq_suspend_timeout = napi_get_irq_suspend_timeout(napi); 199 if (nla_put_uint(rsp, NETDEV_A_NAPI_IRQ_SUSPEND_TIMEOUT, 200 irq_suspend_timeout)) 201 goto nla_put_failure; 202 203 gro_flush_timeout = napi_get_gro_flush_timeout(napi); 204 if (nla_put_uint(rsp, NETDEV_A_NAPI_GRO_FLUSH_TIMEOUT, 205 gro_flush_timeout)) 206 goto nla_put_failure; 207 208 genlmsg_end(rsp, hdr); 209 210 return 0; 211 212 nla_put_failure: 213 genlmsg_cancel(rsp, hdr); 214 return -EMSGSIZE; 215 } 216 217 int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info) 218 { 219 struct napi_struct *napi; 220 struct sk_buff *rsp; 221 u32 napi_id; 222 int err; 223 224 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_ID)) 225 return -EINVAL; 226 227 napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_ID]); 228 229 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); 230 if (!rsp) 231 return -ENOMEM; 232 233 napi = netdev_napi_by_id_lock(genl_info_net(info), napi_id); 234 if (napi) { 235 err = netdev_nl_napi_fill_one(rsp, napi, info); 236 netdev_unlock(napi->dev); 237 } else { 238 NL_SET_BAD_ATTR(info->extack, info->attrs[NETDEV_A_NAPI_ID]); 239 err = -ENOENT; 240 } 241 242 if (err) { 243 goto err_free_msg; 244 } else if (!rsp->len) { 245 err = -ENOENT; 246 goto err_free_msg; 247 } 248 249 return genlmsg_reply(rsp, info); 250 251 err_free_msg: 252 nlmsg_free(rsp); 253 return err; 254 } 255 256 static int 257 netdev_nl_napi_dump_one(struct net_device *netdev, struct sk_buff *rsp, 258 const struct genl_info *info, 259 struct netdev_nl_dump_ctx *ctx) 260 { 261 struct napi_struct *napi; 262 unsigned int prev_id; 263 int err = 0; 264 265 if (!netdev->up) 266 return err; 267 268 prev_id = UINT_MAX; 269 list_for_each_entry(napi, &netdev->napi_list, dev_list) { 270 if (!napi_id_valid(napi->napi_id)) 271 continue; 272 273 /* Dump continuation below depends on the list being sorted */ 274 WARN_ON_ONCE(napi->napi_id >= prev_id); 275 prev_id = napi->napi_id; 276 277 if (ctx->napi_id && napi->napi_id >= ctx->napi_id) 278 continue; 279 280 err = netdev_nl_napi_fill_one(rsp, napi, info); 281 if (err) 282 return err; 283 ctx->napi_id = napi->napi_id; 284 } 285 return err; 286 } 287 288 int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) 289 { 290 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb); 291 const struct genl_info *info = genl_info_dump(cb); 292 struct net *net = sock_net(skb->sk); 293 struct net_device *netdev; 294 u32 ifindex = 0; 295 int err = 0; 296 297 if (info->attrs[NETDEV_A_NAPI_IFINDEX]) 298 ifindex = nla_get_u32(info->attrs[NETDEV_A_NAPI_IFINDEX]); 299 300 if (ifindex) { 301 netdev = netdev_get_by_index_lock(net, ifindex); 302 if (netdev) { 303 err = netdev_nl_napi_dump_one(netdev, skb, info, ctx); 304 netdev_unlock(netdev); 305 } else { 306 err = -ENODEV; 307 } 308 } else { 309 for_each_netdev_lock_scoped(net, netdev, ctx->ifindex) { 310 err = netdev_nl_napi_dump_one(netdev, skb, info, ctx); 311 if (err < 0) 312 break; 313 ctx->napi_id = 0; 314 } 315 } 316 317 return err; 318 } 319 320 static int 321 netdev_nl_napi_set_config(struct napi_struct *napi, struct genl_info *info) 322 { 323 u64 irq_suspend_timeout = 0; 324 u64 gro_flush_timeout = 0; 325 u32 defer = 0; 326 327 if (info->attrs[NETDEV_A_NAPI_DEFER_HARD_IRQS]) { 328 defer = nla_get_u32(info->attrs[NETDEV_A_NAPI_DEFER_HARD_IRQS]); 329 napi_set_defer_hard_irqs(napi, defer); 330 } 331 332 if (info->attrs[NETDEV_A_NAPI_IRQ_SUSPEND_TIMEOUT]) { 333 irq_suspend_timeout = nla_get_uint(info->attrs[NETDEV_A_NAPI_IRQ_SUSPEND_TIMEOUT]); 334 napi_set_irq_suspend_timeout(napi, irq_suspend_timeout); 335 } 336 337 if (info->attrs[NETDEV_A_NAPI_GRO_FLUSH_TIMEOUT]) { 338 gro_flush_timeout = nla_get_uint(info->attrs[NETDEV_A_NAPI_GRO_FLUSH_TIMEOUT]); 339 napi_set_gro_flush_timeout(napi, gro_flush_timeout); 340 } 341 342 return 0; 343 } 344 345 int netdev_nl_napi_set_doit(struct sk_buff *skb, struct genl_info *info) 346 { 347 struct napi_struct *napi; 348 unsigned int napi_id; 349 int err; 350 351 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_ID)) 352 return -EINVAL; 353 354 napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_ID]); 355 356 napi = netdev_napi_by_id_lock(genl_info_net(info), napi_id); 357 if (napi) { 358 err = netdev_nl_napi_set_config(napi, info); 359 netdev_unlock(napi->dev); 360 } else { 361 NL_SET_BAD_ATTR(info->extack, info->attrs[NETDEV_A_NAPI_ID]); 362 err = -ENOENT; 363 } 364 365 return err; 366 } 367 368 static int nla_put_napi_id(struct sk_buff *skb, const struct napi_struct *napi) 369 { 370 if (napi && napi_id_valid(napi->napi_id)) 371 return nla_put_u32(skb, NETDEV_A_QUEUE_NAPI_ID, napi->napi_id); 372 return 0; 373 } 374 375 static int 376 netdev_nl_queue_fill_one(struct sk_buff *rsp, struct net_device *netdev, 377 u32 q_idx, u32 q_type, const struct genl_info *info) 378 { 379 struct pp_memory_provider_params *params; 380 struct netdev_rx_queue *rxq; 381 struct netdev_queue *txq; 382 void *hdr; 383 384 hdr = genlmsg_iput(rsp, info); 385 if (!hdr) 386 return -EMSGSIZE; 387 388 if (nla_put_u32(rsp, NETDEV_A_QUEUE_ID, q_idx) || 389 nla_put_u32(rsp, NETDEV_A_QUEUE_TYPE, q_type) || 390 nla_put_u32(rsp, NETDEV_A_QUEUE_IFINDEX, netdev->ifindex)) 391 goto nla_put_failure; 392 393 switch (q_type) { 394 case NETDEV_QUEUE_TYPE_RX: 395 rxq = __netif_get_rx_queue(netdev, q_idx); 396 if (nla_put_napi_id(rsp, rxq->napi)) 397 goto nla_put_failure; 398 399 params = &rxq->mp_params; 400 if (params->mp_ops && 401 params->mp_ops->nl_fill(params->mp_priv, rsp, rxq)) 402 goto nla_put_failure; 403 #ifdef CONFIG_XDP_SOCKETS 404 if (rxq->pool) 405 if (nla_put_empty_nest(rsp, NETDEV_A_QUEUE_XSK)) 406 goto nla_put_failure; 407 #endif 408 409 break; 410 case NETDEV_QUEUE_TYPE_TX: 411 txq = netdev_get_tx_queue(netdev, q_idx); 412 if (nla_put_napi_id(rsp, txq->napi)) 413 goto nla_put_failure; 414 #ifdef CONFIG_XDP_SOCKETS 415 if (txq->pool) 416 if (nla_put_empty_nest(rsp, NETDEV_A_QUEUE_XSK)) 417 goto nla_put_failure; 418 #endif 419 break; 420 } 421 422 genlmsg_end(rsp, hdr); 423 424 return 0; 425 426 nla_put_failure: 427 genlmsg_cancel(rsp, hdr); 428 return -EMSGSIZE; 429 } 430 431 static int netdev_nl_queue_validate(struct net_device *netdev, u32 q_id, 432 u32 q_type) 433 { 434 switch (q_type) { 435 case NETDEV_QUEUE_TYPE_RX: 436 if (q_id >= netdev->real_num_rx_queues) 437 return -EINVAL; 438 return 0; 439 case NETDEV_QUEUE_TYPE_TX: 440 if (q_id >= netdev->real_num_tx_queues) 441 return -EINVAL; 442 } 443 return 0; 444 } 445 446 static int 447 netdev_nl_queue_fill(struct sk_buff *rsp, struct net_device *netdev, u32 q_idx, 448 u32 q_type, const struct genl_info *info) 449 { 450 int err; 451 452 if (!netdev->up) 453 return -ENOENT; 454 455 err = netdev_nl_queue_validate(netdev, q_idx, q_type); 456 if (err) 457 return err; 458 459 return netdev_nl_queue_fill_one(rsp, netdev, q_idx, q_type, info); 460 } 461 462 int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info) 463 { 464 u32 q_id, q_type, ifindex; 465 struct net_device *netdev; 466 struct sk_buff *rsp; 467 int err; 468 469 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_ID) || 470 GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_TYPE) || 471 GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_IFINDEX)) 472 return -EINVAL; 473 474 q_id = nla_get_u32(info->attrs[NETDEV_A_QUEUE_ID]); 475 q_type = nla_get_u32(info->attrs[NETDEV_A_QUEUE_TYPE]); 476 ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]); 477 478 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); 479 if (!rsp) 480 return -ENOMEM; 481 482 rtnl_lock(); 483 484 netdev = netdev_get_by_index_lock(genl_info_net(info), ifindex); 485 if (netdev) { 486 err = netdev_nl_queue_fill(rsp, netdev, q_id, q_type, info); 487 netdev_unlock(netdev); 488 } else { 489 err = -ENODEV; 490 } 491 492 rtnl_unlock(); 493 494 if (err) 495 goto err_free_msg; 496 497 return genlmsg_reply(rsp, info); 498 499 err_free_msg: 500 nlmsg_free(rsp); 501 return err; 502 } 503 504 static int 505 netdev_nl_queue_dump_one(struct net_device *netdev, struct sk_buff *rsp, 506 const struct genl_info *info, 507 struct netdev_nl_dump_ctx *ctx) 508 { 509 int err = 0; 510 511 if (!netdev->up) 512 return err; 513 514 for (; ctx->rxq_idx < netdev->real_num_rx_queues; ctx->rxq_idx++) { 515 err = netdev_nl_queue_fill_one(rsp, netdev, ctx->rxq_idx, 516 NETDEV_QUEUE_TYPE_RX, info); 517 if (err) 518 return err; 519 } 520 for (; ctx->txq_idx < netdev->real_num_tx_queues; ctx->txq_idx++) { 521 err = netdev_nl_queue_fill_one(rsp, netdev, ctx->txq_idx, 522 NETDEV_QUEUE_TYPE_TX, info); 523 if (err) 524 return err; 525 } 526 527 return err; 528 } 529 530 int netdev_nl_queue_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) 531 { 532 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb); 533 const struct genl_info *info = genl_info_dump(cb); 534 struct net *net = sock_net(skb->sk); 535 struct net_device *netdev; 536 u32 ifindex = 0; 537 int err = 0; 538 539 if (info->attrs[NETDEV_A_QUEUE_IFINDEX]) 540 ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]); 541 542 rtnl_lock(); 543 if (ifindex) { 544 netdev = netdev_get_by_index_lock(net, ifindex); 545 if (netdev) { 546 err = netdev_nl_queue_dump_one(netdev, skb, info, ctx); 547 netdev_unlock(netdev); 548 } else { 549 err = -ENODEV; 550 } 551 } else { 552 for_each_netdev_lock_scoped(net, netdev, ctx->ifindex) { 553 err = netdev_nl_queue_dump_one(netdev, skb, info, ctx); 554 if (err < 0) 555 break; 556 ctx->rxq_idx = 0; 557 ctx->txq_idx = 0; 558 } 559 } 560 rtnl_unlock(); 561 562 return err; 563 } 564 565 #define NETDEV_STAT_NOT_SET (~0ULL) 566 567 static void netdev_nl_stats_add(void *_sum, const void *_add, size_t size) 568 { 569 const u64 *add = _add; 570 u64 *sum = _sum; 571 572 while (size) { 573 if (*add != NETDEV_STAT_NOT_SET && *sum != NETDEV_STAT_NOT_SET) 574 *sum += *add; 575 sum++; 576 add++; 577 size -= 8; 578 } 579 } 580 581 static int netdev_stat_put(struct sk_buff *rsp, unsigned int attr_id, u64 value) 582 { 583 if (value == NETDEV_STAT_NOT_SET) 584 return 0; 585 return nla_put_uint(rsp, attr_id, value); 586 } 587 588 static int 589 netdev_nl_stats_write_rx(struct sk_buff *rsp, struct netdev_queue_stats_rx *rx) 590 { 591 if (netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_PACKETS, rx->packets) || 592 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_BYTES, rx->bytes) || 593 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_ALLOC_FAIL, rx->alloc_fail) || 594 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_DROPS, rx->hw_drops) || 595 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_DROP_OVERRUNS, rx->hw_drop_overruns) || 596 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_CSUM_COMPLETE, rx->csum_complete) || 597 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_CSUM_UNNECESSARY, rx->csum_unnecessary) || 598 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_CSUM_NONE, rx->csum_none) || 599 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_CSUM_BAD, rx->csum_bad) || 600 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_GRO_PACKETS, rx->hw_gro_packets) || 601 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_GRO_BYTES, rx->hw_gro_bytes) || 602 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_GRO_WIRE_PACKETS, rx->hw_gro_wire_packets) || 603 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_GRO_WIRE_BYTES, rx->hw_gro_wire_bytes) || 604 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_DROP_RATELIMITS, rx->hw_drop_ratelimits)) 605 return -EMSGSIZE; 606 return 0; 607 } 608 609 static int 610 netdev_nl_stats_write_tx(struct sk_buff *rsp, struct netdev_queue_stats_tx *tx) 611 { 612 if (netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_PACKETS, tx->packets) || 613 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_BYTES, tx->bytes) || 614 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_DROPS, tx->hw_drops) || 615 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_DROP_ERRORS, tx->hw_drop_errors) || 616 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_CSUM_NONE, tx->csum_none) || 617 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_NEEDS_CSUM, tx->needs_csum) || 618 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_GSO_PACKETS, tx->hw_gso_packets) || 619 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_GSO_BYTES, tx->hw_gso_bytes) || 620 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_GSO_WIRE_PACKETS, tx->hw_gso_wire_packets) || 621 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_GSO_WIRE_BYTES, tx->hw_gso_wire_bytes) || 622 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_DROP_RATELIMITS, tx->hw_drop_ratelimits) || 623 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_STOP, tx->stop) || 624 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_WAKE, tx->wake)) 625 return -EMSGSIZE; 626 return 0; 627 } 628 629 static int 630 netdev_nl_stats_queue(struct net_device *netdev, struct sk_buff *rsp, 631 u32 q_type, int i, const struct genl_info *info) 632 { 633 const struct netdev_stat_ops *ops = netdev->stat_ops; 634 struct netdev_queue_stats_rx rx; 635 struct netdev_queue_stats_tx tx; 636 void *hdr; 637 638 hdr = genlmsg_iput(rsp, info); 639 if (!hdr) 640 return -EMSGSIZE; 641 if (nla_put_u32(rsp, NETDEV_A_QSTATS_IFINDEX, netdev->ifindex) || 642 nla_put_u32(rsp, NETDEV_A_QSTATS_QUEUE_TYPE, q_type) || 643 nla_put_u32(rsp, NETDEV_A_QSTATS_QUEUE_ID, i)) 644 goto nla_put_failure; 645 646 switch (q_type) { 647 case NETDEV_QUEUE_TYPE_RX: 648 memset(&rx, 0xff, sizeof(rx)); 649 ops->get_queue_stats_rx(netdev, i, &rx); 650 if (!memchr_inv(&rx, 0xff, sizeof(rx))) 651 goto nla_cancel; 652 if (netdev_nl_stats_write_rx(rsp, &rx)) 653 goto nla_put_failure; 654 break; 655 case NETDEV_QUEUE_TYPE_TX: 656 memset(&tx, 0xff, sizeof(tx)); 657 ops->get_queue_stats_tx(netdev, i, &tx); 658 if (!memchr_inv(&tx, 0xff, sizeof(tx))) 659 goto nla_cancel; 660 if (netdev_nl_stats_write_tx(rsp, &tx)) 661 goto nla_put_failure; 662 break; 663 } 664 665 genlmsg_end(rsp, hdr); 666 return 0; 667 668 nla_cancel: 669 genlmsg_cancel(rsp, hdr); 670 return 0; 671 nla_put_failure: 672 genlmsg_cancel(rsp, hdr); 673 return -EMSGSIZE; 674 } 675 676 static int 677 netdev_nl_stats_by_queue(struct net_device *netdev, struct sk_buff *rsp, 678 const struct genl_info *info, 679 struct netdev_nl_dump_ctx *ctx) 680 { 681 const struct netdev_stat_ops *ops = netdev->stat_ops; 682 int i, err; 683 684 if (!(netdev->flags & IFF_UP)) 685 return 0; 686 687 i = ctx->rxq_idx; 688 while (ops->get_queue_stats_rx && i < netdev->real_num_rx_queues) { 689 err = netdev_nl_stats_queue(netdev, rsp, NETDEV_QUEUE_TYPE_RX, 690 i, info); 691 if (err) 692 return err; 693 ctx->rxq_idx = ++i; 694 } 695 i = ctx->txq_idx; 696 while (ops->get_queue_stats_tx && i < netdev->real_num_tx_queues) { 697 err = netdev_nl_stats_queue(netdev, rsp, NETDEV_QUEUE_TYPE_TX, 698 i, info); 699 if (err) 700 return err; 701 ctx->txq_idx = ++i; 702 } 703 704 ctx->rxq_idx = 0; 705 ctx->txq_idx = 0; 706 return 0; 707 } 708 709 static int 710 netdev_nl_stats_by_netdev(struct net_device *netdev, struct sk_buff *rsp, 711 const struct genl_info *info) 712 { 713 struct netdev_queue_stats_rx rx_sum, rx; 714 struct netdev_queue_stats_tx tx_sum, tx; 715 const struct netdev_stat_ops *ops; 716 void *hdr; 717 int i; 718 719 ops = netdev->stat_ops; 720 /* Netdev can't guarantee any complete counters */ 721 if (!ops->get_base_stats) 722 return 0; 723 724 memset(&rx_sum, 0xff, sizeof(rx_sum)); 725 memset(&tx_sum, 0xff, sizeof(tx_sum)); 726 727 ops->get_base_stats(netdev, &rx_sum, &tx_sum); 728 729 /* The op was there, but nothing reported, don't bother */ 730 if (!memchr_inv(&rx_sum, 0xff, sizeof(rx_sum)) && 731 !memchr_inv(&tx_sum, 0xff, sizeof(tx_sum))) 732 return 0; 733 734 hdr = genlmsg_iput(rsp, info); 735 if (!hdr) 736 return -EMSGSIZE; 737 if (nla_put_u32(rsp, NETDEV_A_QSTATS_IFINDEX, netdev->ifindex)) 738 goto nla_put_failure; 739 740 for (i = 0; i < netdev->real_num_rx_queues; i++) { 741 memset(&rx, 0xff, sizeof(rx)); 742 if (ops->get_queue_stats_rx) 743 ops->get_queue_stats_rx(netdev, i, &rx); 744 netdev_nl_stats_add(&rx_sum, &rx, sizeof(rx)); 745 } 746 for (i = 0; i < netdev->real_num_tx_queues; i++) { 747 memset(&tx, 0xff, sizeof(tx)); 748 if (ops->get_queue_stats_tx) 749 ops->get_queue_stats_tx(netdev, i, &tx); 750 netdev_nl_stats_add(&tx_sum, &tx, sizeof(tx)); 751 } 752 753 if (netdev_nl_stats_write_rx(rsp, &rx_sum) || 754 netdev_nl_stats_write_tx(rsp, &tx_sum)) 755 goto nla_put_failure; 756 757 genlmsg_end(rsp, hdr); 758 return 0; 759 760 nla_put_failure: 761 genlmsg_cancel(rsp, hdr); 762 return -EMSGSIZE; 763 } 764 765 static int 766 netdev_nl_qstats_get_dump_one(struct net_device *netdev, unsigned int scope, 767 struct sk_buff *skb, const struct genl_info *info, 768 struct netdev_nl_dump_ctx *ctx) 769 { 770 if (!netdev->stat_ops) 771 return 0; 772 773 switch (scope) { 774 case 0: 775 return netdev_nl_stats_by_netdev(netdev, skb, info); 776 case NETDEV_QSTATS_SCOPE_QUEUE: 777 return netdev_nl_stats_by_queue(netdev, skb, info, ctx); 778 } 779 780 return -EINVAL; /* Should not happen, per netlink policy */ 781 } 782 783 int netdev_nl_qstats_get_dumpit(struct sk_buff *skb, 784 struct netlink_callback *cb) 785 { 786 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb); 787 const struct genl_info *info = genl_info_dump(cb); 788 struct net *net = sock_net(skb->sk); 789 struct net_device *netdev; 790 unsigned int ifindex; 791 unsigned int scope; 792 int err = 0; 793 794 scope = 0; 795 if (info->attrs[NETDEV_A_QSTATS_SCOPE]) 796 scope = nla_get_uint(info->attrs[NETDEV_A_QSTATS_SCOPE]); 797 798 ifindex = 0; 799 if (info->attrs[NETDEV_A_QSTATS_IFINDEX]) 800 ifindex = nla_get_u32(info->attrs[NETDEV_A_QSTATS_IFINDEX]); 801 802 rtnl_lock(); 803 if (ifindex) { 804 netdev = __dev_get_by_index(net, ifindex); 805 if (netdev && netdev->stat_ops) { 806 err = netdev_nl_qstats_get_dump_one(netdev, scope, skb, 807 info, ctx); 808 } else { 809 NL_SET_BAD_ATTR(info->extack, 810 info->attrs[NETDEV_A_QSTATS_IFINDEX]); 811 err = netdev ? -EOPNOTSUPP : -ENODEV; 812 } 813 } else { 814 for_each_netdev_dump(net, netdev, ctx->ifindex) { 815 err = netdev_nl_qstats_get_dump_one(netdev, scope, skb, 816 info, ctx); 817 if (err < 0) 818 break; 819 } 820 } 821 rtnl_unlock(); 822 823 return err; 824 } 825 826 int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info) 827 { 828 struct nlattr *tb[ARRAY_SIZE(netdev_queue_id_nl_policy)]; 829 struct net_devmem_dmabuf_binding *binding; 830 struct list_head *sock_binding_list; 831 u32 ifindex, dmabuf_fd, rxq_idx; 832 struct net_device *netdev; 833 struct sk_buff *rsp; 834 struct nlattr *attr; 835 int rem, err = 0; 836 void *hdr; 837 838 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_DEV_IFINDEX) || 839 GENL_REQ_ATTR_CHECK(info, NETDEV_A_DMABUF_FD) || 840 GENL_REQ_ATTR_CHECK(info, NETDEV_A_DMABUF_QUEUES)) 841 return -EINVAL; 842 843 ifindex = nla_get_u32(info->attrs[NETDEV_A_DEV_IFINDEX]); 844 dmabuf_fd = nla_get_u32(info->attrs[NETDEV_A_DMABUF_FD]); 845 846 sock_binding_list = genl_sk_priv_get(&netdev_nl_family, 847 NETLINK_CB(skb).sk); 848 if (IS_ERR(sock_binding_list)) 849 return PTR_ERR(sock_binding_list); 850 851 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); 852 if (!rsp) 853 return -ENOMEM; 854 855 hdr = genlmsg_iput(rsp, info); 856 if (!hdr) { 857 err = -EMSGSIZE; 858 goto err_genlmsg_free; 859 } 860 861 rtnl_lock(); 862 863 netdev = __dev_get_by_index(genl_info_net(info), ifindex); 864 if (!netdev || !netif_device_present(netdev)) { 865 err = -ENODEV; 866 goto err_unlock; 867 } 868 869 if (dev_xdp_prog_count(netdev)) { 870 NL_SET_ERR_MSG(info->extack, "unable to bind dmabuf to device with XDP program attached"); 871 err = -EEXIST; 872 goto err_unlock; 873 } 874 875 binding = net_devmem_bind_dmabuf(netdev, dmabuf_fd, info->extack); 876 if (IS_ERR(binding)) { 877 err = PTR_ERR(binding); 878 goto err_unlock; 879 } 880 881 nla_for_each_attr_type(attr, NETDEV_A_DMABUF_QUEUES, 882 genlmsg_data(info->genlhdr), 883 genlmsg_len(info->genlhdr), rem) { 884 err = nla_parse_nested( 885 tb, ARRAY_SIZE(netdev_queue_id_nl_policy) - 1, attr, 886 netdev_queue_id_nl_policy, info->extack); 887 if (err < 0) 888 goto err_unbind; 889 890 if (NL_REQ_ATTR_CHECK(info->extack, attr, tb, NETDEV_A_QUEUE_ID) || 891 NL_REQ_ATTR_CHECK(info->extack, attr, tb, NETDEV_A_QUEUE_TYPE)) { 892 err = -EINVAL; 893 goto err_unbind; 894 } 895 896 if (nla_get_u32(tb[NETDEV_A_QUEUE_TYPE]) != NETDEV_QUEUE_TYPE_RX) { 897 NL_SET_BAD_ATTR(info->extack, tb[NETDEV_A_QUEUE_TYPE]); 898 err = -EINVAL; 899 goto err_unbind; 900 } 901 902 rxq_idx = nla_get_u32(tb[NETDEV_A_QUEUE_ID]); 903 904 err = net_devmem_bind_dmabuf_to_queue(netdev, rxq_idx, binding, 905 info->extack); 906 if (err) 907 goto err_unbind; 908 } 909 910 list_add(&binding->list, sock_binding_list); 911 912 nla_put_u32(rsp, NETDEV_A_DMABUF_ID, binding->id); 913 genlmsg_end(rsp, hdr); 914 915 err = genlmsg_reply(rsp, info); 916 if (err) 917 goto err_unbind; 918 919 rtnl_unlock(); 920 921 return 0; 922 923 err_unbind: 924 net_devmem_unbind_dmabuf(binding); 925 err_unlock: 926 rtnl_unlock(); 927 err_genlmsg_free: 928 nlmsg_free(rsp); 929 return err; 930 } 931 932 void netdev_nl_sock_priv_init(struct list_head *priv) 933 { 934 INIT_LIST_HEAD(priv); 935 } 936 937 void netdev_nl_sock_priv_destroy(struct list_head *priv) 938 { 939 struct net_devmem_dmabuf_binding *binding; 940 struct net_devmem_dmabuf_binding *temp; 941 942 list_for_each_entry_safe(binding, temp, priv, list) { 943 rtnl_lock(); 944 net_devmem_unbind_dmabuf(binding); 945 rtnl_unlock(); 946 } 947 } 948 949 static int netdev_genl_netdevice_event(struct notifier_block *nb, 950 unsigned long event, void *ptr) 951 { 952 struct net_device *netdev = netdev_notifier_info_to_dev(ptr); 953 954 switch (event) { 955 case NETDEV_REGISTER: 956 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_ADD_NTF); 957 break; 958 case NETDEV_UNREGISTER: 959 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_DEL_NTF); 960 break; 961 case NETDEV_XDP_FEAT_CHANGE: 962 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_CHANGE_NTF); 963 break; 964 } 965 966 return NOTIFY_OK; 967 } 968 969 static struct notifier_block netdev_genl_nb = { 970 .notifier_call = netdev_genl_netdevice_event, 971 }; 972 973 static int __init netdev_genl_init(void) 974 { 975 int err; 976 977 err = register_netdevice_notifier(&netdev_genl_nb); 978 if (err) 979 return err; 980 981 err = genl_register_family(&netdev_nl_family); 982 if (err) 983 goto err_unreg_ntf; 984 985 return 0; 986 987 err_unreg_ntf: 988 unregister_netdevice_notifier(&netdev_genl_nb); 989 return err; 990 } 991 992 subsys_initcall(netdev_genl_init); 993