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