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/net_namespace.h>
7 #include <net/sock.h>
8 #include <net/xdp.h>
9 #include <net/xdp_sock.h>
10 #include <net/netdev_rx_queue.h>
11 #include <net/netdev_queues.h>
12 #include <net/busy_poll.h>
13
14 #include "netdev-genl-gen.h"
15 #include "dev.h"
16
17 struct netdev_nl_dump_ctx {
18 unsigned long ifindex;
19 unsigned int rxq_idx;
20 unsigned int txq_idx;
21 unsigned int napi_id;
22 };
23
24 static struct netdev_nl_dump_ctx *netdev_dump_ctx(struct netlink_callback *cb)
25 {
26 NL_ASSERT_DUMP_CTX_FITS(struct netdev_nl_dump_ctx);
27
28 return (struct netdev_nl_dump_ctx *)cb->ctx;
29 }
30
31 static int
32 netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
33 const struct genl_info *info)
34 {
35 u64 xsk_features = 0;
36 u64 xdp_rx_meta = 0;
37 void *hdr;
38
39 hdr = genlmsg_iput(rsp, info);
40 if (!hdr)
41 return -EMSGSIZE;
42
43 #define XDP_METADATA_KFUNC(_, flag, __, xmo) \
44 if (netdev->xdp_metadata_ops && netdev->xdp_metadata_ops->xmo) \
45 xdp_rx_meta |= flag;
46 XDP_METADATA_KFUNC_xxx
47 #undef XDP_METADATA_KFUNC
48
49 if (netdev->xsk_tx_metadata_ops) {
50 if (netdev->xsk_tx_metadata_ops->tmo_fill_timestamp)
51 xsk_features |= NETDEV_XSK_FLAGS_TX_TIMESTAMP;
52 if (netdev->xsk_tx_metadata_ops->tmo_request_checksum)
53 xsk_features |= NETDEV_XSK_FLAGS_TX_CHECKSUM;
54 }
55
56 if (nla_put_u32(rsp, NETDEV_A_DEV_IFINDEX, netdev->ifindex) ||
57 nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_FEATURES,
58 netdev->xdp_features, NETDEV_A_DEV_PAD) ||
59 nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_RX_METADATA_FEATURES,
60 xdp_rx_meta, NETDEV_A_DEV_PAD) ||
61 nla_put_u64_64bit(rsp, NETDEV_A_DEV_XSK_FEATURES,
62 xsk_features, NETDEV_A_DEV_PAD))
63 goto err_cancel_msg;
64
65 if (netdev->xdp_features & NETDEV_XDP_ACT_XSK_ZEROCOPY) {
66 if (nla_put_u32(rsp, NETDEV_A_DEV_XDP_ZC_MAX_SEGS,
67 netdev->xdp_zc_max_segs))
68 goto err_cancel_msg;
69 }
70
71 genlmsg_end(rsp, hdr);
72
73 return 0;
74
75 err_cancel_msg:
76 genlmsg_cancel(rsp, hdr);
77 return -EMSGSIZE;
78 }
79
80 static void
81 netdev_genl_dev_notify(struct net_device *netdev, int cmd)
82 {
83 struct genl_info info;
84 struct sk_buff *ntf;
85
86 if (!genl_has_listeners(&netdev_nl_family, dev_net(netdev),
87 NETDEV_NLGRP_MGMT))
88 return;
89
90 genl_info_init_ntf(&info, &netdev_nl_family, cmd);
91
92 ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
93 if (!ntf)
94 return;
95
96 if (netdev_nl_dev_fill(netdev, ntf, &info)) {
97 nlmsg_free(ntf);
98 return;
99 }
100
101 genlmsg_multicast_netns(&netdev_nl_family, dev_net(netdev), ntf,
102 0, NETDEV_NLGRP_MGMT, GFP_KERNEL);
103 }
104
105 int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
106 {
107 struct net_device *netdev;
108 struct sk_buff *rsp;
109 u32 ifindex;
110 int err;
111
112 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_DEV_IFINDEX))
113 return -EINVAL;
114
115 ifindex = nla_get_u32(info->attrs[NETDEV_A_DEV_IFINDEX]);
116
117 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
118 if (!rsp)
119 return -ENOMEM;
120
121 rtnl_lock();
122
123 netdev = __dev_get_by_index(genl_info_net(info), ifindex);
124 if (netdev)
125 err = netdev_nl_dev_fill(netdev, rsp, info);
126 else
127 err = -ENODEV;
128
129 rtnl_unlock();
130
131 if (err)
132 goto err_free_msg;
133
134 return genlmsg_reply(rsp, info);
135
136 err_free_msg:
137 nlmsg_free(rsp);
138 return err;
139 }
140
141 int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
142 {
143 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
144 struct net *net = sock_net(skb->sk);
145 struct net_device *netdev;
146 int err = 0;
147
148 rtnl_lock();
149 for_each_netdev_dump(net, netdev, ctx->ifindex) {
150 err = netdev_nl_dev_fill(netdev, skb, genl_info_dump(cb));
151 if (err < 0)
152 break;
153 }
154 rtnl_unlock();
155
156 return err;
157 }
158
159 static int
160 netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
161 const struct genl_info *info)
162 {
163 void *hdr;
164 pid_t pid;
165
166 if (WARN_ON_ONCE(!napi->dev))
167 return -EINVAL;
168 if (!(napi->dev->flags & IFF_UP))
169 return 0;
170
171 hdr = genlmsg_iput(rsp, info);
172 if (!hdr)
173 return -EMSGSIZE;
174
175 if (napi->napi_id >= MIN_NAPI_ID &&
176 nla_put_u32(rsp, NETDEV_A_NAPI_ID, napi->napi_id))
177 goto nla_put_failure;
178
179 if (nla_put_u32(rsp, NETDEV_A_NAPI_IFINDEX, napi->dev->ifindex))
180 goto nla_put_failure;
181
182 if (napi->irq >= 0 && nla_put_u32(rsp, NETDEV_A_NAPI_IRQ, napi->irq))
183 goto nla_put_failure;
184
185 if (napi->thread) {
186 pid = task_pid_nr(napi->thread);
187 if (nla_put_u32(rsp, NETDEV_A_NAPI_PID, pid))
188 goto nla_put_failure;
189 }
190
191 genlmsg_end(rsp, hdr);
192
193 return 0;
194
195 nla_put_failure:
196 genlmsg_cancel(rsp, hdr);
197 return -EMSGSIZE;
198 }
199
200 int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
201 {
202 struct napi_struct *napi;
203 struct sk_buff *rsp;
204 u32 napi_id;
205 int err;
206
207 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_ID))
208 return -EINVAL;
209
210 napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_ID]);
211
212 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
213 if (!rsp)
214 return -ENOMEM;
215
216 rtnl_lock();
217
218 napi = napi_by_id(napi_id);
219 if (napi)
220 err = netdev_nl_napi_fill_one(rsp, napi, info);
221 else
222 err = -EINVAL;
223
224 rtnl_unlock();
225
226 if (err)
227 goto err_free_msg;
228
229 return genlmsg_reply(rsp, info);
230
231 err_free_msg:
232 nlmsg_free(rsp);
233 return err;
234 }
235
236 static int
237 netdev_nl_napi_dump_one(struct net_device *netdev, struct sk_buff *rsp,
238 const struct genl_info *info,
239 struct netdev_nl_dump_ctx *ctx)
240 {
241 struct napi_struct *napi;
242 int err = 0;
243
244 if (!(netdev->flags & IFF_UP))
245 return err;
246
247 list_for_each_entry(napi, &netdev->napi_list, dev_list) {
248 if (ctx->napi_id && napi->napi_id >= ctx->napi_id)
249 continue;
250
251 err = netdev_nl_napi_fill_one(rsp, napi, info);
252 if (err)
253 return err;
254 ctx->napi_id = napi->napi_id;
255 }
256 return err;
257 }
258
259 int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
260 {
261 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
262 const struct genl_info *info = genl_info_dump(cb);
263 struct net *net = sock_net(skb->sk);
264 struct net_device *netdev;
265 u32 ifindex = 0;
266 int err = 0;
267
268 if (info->attrs[NETDEV_A_NAPI_IFINDEX])
269 ifindex = nla_get_u32(info->attrs[NETDEV_A_NAPI_IFINDEX]);
270
271 rtnl_lock();
272 if (ifindex) {
273 netdev = __dev_get_by_index(net, ifindex);
274 if (netdev)
275 err = netdev_nl_napi_dump_one(netdev, skb, info, ctx);
276 else
277 err = -ENODEV;
278 } else {
279 for_each_netdev_dump(net, netdev, ctx->ifindex) {
280 err = netdev_nl_napi_dump_one(netdev, skb, info, ctx);
281 if (err < 0)
282 break;
283 ctx->napi_id = 0;
284 }
285 }
286 rtnl_unlock();
287
288 return err;
289 }
290
291 static int
292 netdev_nl_queue_fill_one(struct sk_buff *rsp, struct net_device *netdev,
293 u32 q_idx, u32 q_type, const struct genl_info *info)
294 {
295 struct netdev_rx_queue *rxq;
296 struct netdev_queue *txq;
297 void *hdr;
298
299 hdr = genlmsg_iput(rsp, info);
300 if (!hdr)
301 return -EMSGSIZE;
302
303 if (nla_put_u32(rsp, NETDEV_A_QUEUE_ID, q_idx) ||
304 nla_put_u32(rsp, NETDEV_A_QUEUE_TYPE, q_type) ||
305 nla_put_u32(rsp, NETDEV_A_QUEUE_IFINDEX, netdev->ifindex))
306 goto nla_put_failure;
307
308 switch (q_type) {
309 case NETDEV_QUEUE_TYPE_RX:
310 rxq = __netif_get_rx_queue(netdev, q_idx);
311 if (rxq->napi && nla_put_u32(rsp, NETDEV_A_QUEUE_NAPI_ID,
312 rxq->napi->napi_id))
313 goto nla_put_failure;
314 break;
315 case NETDEV_QUEUE_TYPE_TX:
316 txq = netdev_get_tx_queue(netdev, q_idx);
317 if (txq->napi && nla_put_u32(rsp, NETDEV_A_QUEUE_NAPI_ID,
318 txq->napi->napi_id))
319 goto nla_put_failure;
320 }
321
322 genlmsg_end(rsp, hdr);
323
324 return 0;
325
326 nla_put_failure:
327 genlmsg_cancel(rsp, hdr);
328 return -EMSGSIZE;
329 }
330
331 static int netdev_nl_queue_validate(struct net_device *netdev, u32 q_id,
332 u32 q_type)
333 {
334 switch (q_type) {
335 case NETDEV_QUEUE_TYPE_RX:
336 if (q_id >= netdev->real_num_rx_queues)
337 return -EINVAL;
338 return 0;
339 case NETDEV_QUEUE_TYPE_TX:
340 if (q_id >= netdev->real_num_tx_queues)
341 return -EINVAL;
342 }
343 return 0;
344 }
345
346 static int
347 netdev_nl_queue_fill(struct sk_buff *rsp, struct net_device *netdev, u32 q_idx,
348 u32 q_type, const struct genl_info *info)
349 {
350 int err = 0;
351
352 if (!(netdev->flags & IFF_UP))
353 return err;
354
355 err = netdev_nl_queue_validate(netdev, q_idx, q_type);
356 if (err)
357 return err;
358
359 return netdev_nl_queue_fill_one(rsp, netdev, q_idx, q_type, info);
360 }
361
362 int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info)
363 {
364 u32 q_id, q_type, ifindex;
365 struct net_device *netdev;
366 struct sk_buff *rsp;
367 int err;
368
369 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_ID) ||
370 GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_TYPE) ||
371 GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_IFINDEX))
372 return -EINVAL;
373
374 q_id = nla_get_u32(info->attrs[NETDEV_A_QUEUE_ID]);
375 q_type = nla_get_u32(info->attrs[NETDEV_A_QUEUE_TYPE]);
376 ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]);
377
378 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
379 if (!rsp)
380 return -ENOMEM;
381
382 rtnl_lock();
383
384 netdev = __dev_get_by_index(genl_info_net(info), ifindex);
385 if (netdev)
386 err = netdev_nl_queue_fill(rsp, netdev, q_id, q_type, info);
387 else
388 err = -ENODEV;
389
390 rtnl_unlock();
391
392 if (err)
393 goto err_free_msg;
394
395 return genlmsg_reply(rsp, info);
396
397 err_free_msg:
398 nlmsg_free(rsp);
399 return err;
400 }
401
402 static int
403 netdev_nl_queue_dump_one(struct net_device *netdev, struct sk_buff *rsp,
404 const struct genl_info *info,
405 struct netdev_nl_dump_ctx *ctx)
406 {
407 int err = 0;
408 int i;
409
410 if (!(netdev->flags & IFF_UP))
411 return err;
412
413 for (i = ctx->rxq_idx; i < netdev->real_num_rx_queues;) {
414 err = netdev_nl_queue_fill_one(rsp, netdev, i,
415 NETDEV_QUEUE_TYPE_RX, info);
416 if (err)
417 return err;
418 ctx->rxq_idx = i++;
419 }
420 for (i = ctx->txq_idx; i < netdev->real_num_tx_queues;) {
421 err = netdev_nl_queue_fill_one(rsp, netdev, i,
422 NETDEV_QUEUE_TYPE_TX, info);
423 if (err)
424 return err;
425 ctx->txq_idx = i++;
426 }
427
428 return err;
429 }
430
431 int netdev_nl_queue_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
432 {
433 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
434 const struct genl_info *info = genl_info_dump(cb);
435 struct net *net = sock_net(skb->sk);
436 struct net_device *netdev;
437 u32 ifindex = 0;
438 int err = 0;
439
440 if (info->attrs[NETDEV_A_QUEUE_IFINDEX])
441 ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]);
442
443 rtnl_lock();
444 if (ifindex) {
445 netdev = __dev_get_by_index(net, ifindex);
446 if (netdev)
447 err = netdev_nl_queue_dump_one(netdev, skb, info, ctx);
448 else
449 err = -ENODEV;
450 } else {
451 for_each_netdev_dump(net, netdev, ctx->ifindex) {
452 err = netdev_nl_queue_dump_one(netdev, skb, info, ctx);
453 if (err < 0)
454 break;
455 ctx->rxq_idx = 0;
456 ctx->txq_idx = 0;
457 }
458 }
459 rtnl_unlock();
460
461 return err;
462 }
463
464 #define NETDEV_STAT_NOT_SET (~0ULL)
465
466 static void netdev_nl_stats_add(void *_sum, const void *_add, size_t size)
467 {
468 const u64 *add = _add;
469 u64 *sum = _sum;
470
471 while (size) {
472 if (*add != NETDEV_STAT_NOT_SET && *sum != NETDEV_STAT_NOT_SET)
473 *sum += *add;
474 sum++;
475 add++;
476 size -= 8;
477 }
478 }
479
480 static int netdev_stat_put(struct sk_buff *rsp, unsigned int attr_id, u64 value)
481 {
482 if (value == NETDEV_STAT_NOT_SET)
483 return 0;
484 return nla_put_uint(rsp, attr_id, value);
485 }
486
487 static int
488 netdev_nl_stats_write_rx(struct sk_buff *rsp, struct netdev_queue_stats_rx *rx)
489 {
490 if (netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_PACKETS, rx->packets) ||
491 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_BYTES, rx->bytes) ||
492 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_ALLOC_FAIL, rx->alloc_fail) ||
493 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_DROPS, rx->hw_drops) ||
494 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_DROP_OVERRUNS, rx->hw_drop_overruns) ||
495 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_CSUM_UNNECESSARY, rx->csum_unnecessary) ||
496 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_CSUM_NONE, rx->csum_none) ||
497 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_CSUM_BAD, rx->csum_bad) ||
498 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_GRO_PACKETS, rx->hw_gro_packets) ||
499 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_GRO_BYTES, rx->hw_gro_bytes) ||
500 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_GRO_WIRE_PACKETS, rx->hw_gro_wire_packets) ||
501 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_GRO_WIRE_BYTES, rx->hw_gro_wire_bytes) ||
502 netdev_stat_put(rsp, NETDEV_A_QSTATS_RX_HW_DROP_RATELIMITS, rx->hw_drop_ratelimits))
503 return -EMSGSIZE;
504 return 0;
505 }
506
507 static int
508 netdev_nl_stats_write_tx(struct sk_buff *rsp, struct netdev_queue_stats_tx *tx)
509 {
510 if (netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_PACKETS, tx->packets) ||
511 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_BYTES, tx->bytes) ||
512 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_DROPS, tx->hw_drops) ||
513 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_DROP_ERRORS, tx->hw_drop_errors) ||
514 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_CSUM_NONE, tx->csum_none) ||
515 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_NEEDS_CSUM, tx->needs_csum) ||
516 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_GSO_PACKETS, tx->hw_gso_packets) ||
517 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_GSO_BYTES, tx->hw_gso_bytes) ||
518 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_GSO_WIRE_PACKETS, tx->hw_gso_wire_packets) ||
519 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_GSO_WIRE_BYTES, tx->hw_gso_wire_bytes) ||
520 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_HW_DROP_RATELIMITS, tx->hw_drop_ratelimits) ||
521 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_STOP, tx->stop) ||
522 netdev_stat_put(rsp, NETDEV_A_QSTATS_TX_WAKE, tx->wake))
523 return -EMSGSIZE;
524 return 0;
525 }
526
527 static int
528 netdev_nl_stats_queue(struct net_device *netdev, struct sk_buff *rsp,
529 u32 q_type, int i, const struct genl_info *info)
530 {
531 const struct netdev_stat_ops *ops = netdev->stat_ops;
532 struct netdev_queue_stats_rx rx;
533 struct netdev_queue_stats_tx tx;
534 void *hdr;
535
536 hdr = genlmsg_iput(rsp, info);
537 if (!hdr)
538 return -EMSGSIZE;
539 if (nla_put_u32(rsp, NETDEV_A_QSTATS_IFINDEX, netdev->ifindex) ||
540 nla_put_u32(rsp, NETDEV_A_QSTATS_QUEUE_TYPE, q_type) ||
541 nla_put_u32(rsp, NETDEV_A_QSTATS_QUEUE_ID, i))
542 goto nla_put_failure;
543
544 switch (q_type) {
545 case NETDEV_QUEUE_TYPE_RX:
546 memset(&rx, 0xff, sizeof(rx));
547 ops->get_queue_stats_rx(netdev, i, &rx);
548 if (!memchr_inv(&rx, 0xff, sizeof(rx)))
549 goto nla_cancel;
550 if (netdev_nl_stats_write_rx(rsp, &rx))
551 goto nla_put_failure;
552 break;
553 case NETDEV_QUEUE_TYPE_TX:
554 memset(&tx, 0xff, sizeof(tx));
555 ops->get_queue_stats_tx(netdev, i, &tx);
556 if (!memchr_inv(&tx, 0xff, sizeof(tx)))
557 goto nla_cancel;
558 if (netdev_nl_stats_write_tx(rsp, &tx))
559 goto nla_put_failure;
560 break;
561 }
562
563 genlmsg_end(rsp, hdr);
564 return 0;
565
566 nla_cancel:
567 genlmsg_cancel(rsp, hdr);
568 return 0;
569 nla_put_failure:
570 genlmsg_cancel(rsp, hdr);
571 return -EMSGSIZE;
572 }
573
574 static int
575 netdev_nl_stats_by_queue(struct net_device *netdev, struct sk_buff *rsp,
576 const struct genl_info *info,
577 struct netdev_nl_dump_ctx *ctx)
578 {
579 const struct netdev_stat_ops *ops = netdev->stat_ops;
580 int i, err;
581
582 if (!(netdev->flags & IFF_UP))
583 return 0;
584
585 i = ctx->rxq_idx;
586 while (ops->get_queue_stats_rx && i < netdev->real_num_rx_queues) {
587 err = netdev_nl_stats_queue(netdev, rsp, NETDEV_QUEUE_TYPE_RX,
588 i, info);
589 if (err)
590 return err;
591 ctx->rxq_idx = i++;
592 }
593 i = ctx->txq_idx;
594 while (ops->get_queue_stats_tx && i < netdev->real_num_tx_queues) {
595 err = netdev_nl_stats_queue(netdev, rsp, NETDEV_QUEUE_TYPE_TX,
596 i, info);
597 if (err)
598 return err;
599 ctx->txq_idx = i++;
600 }
601
602 ctx->rxq_idx = 0;
603 ctx->txq_idx = 0;
604 return 0;
605 }
606
607 static int
608 netdev_nl_stats_by_netdev(struct net_device *netdev, struct sk_buff *rsp,
609 const struct genl_info *info)
610 {
611 struct netdev_queue_stats_rx rx_sum, rx;
612 struct netdev_queue_stats_tx tx_sum, tx;
613 const struct netdev_stat_ops *ops;
614 void *hdr;
615 int i;
616
617 ops = netdev->stat_ops;
618 /* Netdev can't guarantee any complete counters */
619 if (!ops->get_base_stats)
620 return 0;
621
622 memset(&rx_sum, 0xff, sizeof(rx_sum));
623 memset(&tx_sum, 0xff, sizeof(tx_sum));
624
625 ops->get_base_stats(netdev, &rx_sum, &tx_sum);
626
627 /* The op was there, but nothing reported, don't bother */
628 if (!memchr_inv(&rx_sum, 0xff, sizeof(rx_sum)) &&
629 !memchr_inv(&tx_sum, 0xff, sizeof(tx_sum)))
630 return 0;
631
632 hdr = genlmsg_iput(rsp, info);
633 if (!hdr)
634 return -EMSGSIZE;
635 if (nla_put_u32(rsp, NETDEV_A_QSTATS_IFINDEX, netdev->ifindex))
636 goto nla_put_failure;
637
638 for (i = 0; i < netdev->real_num_rx_queues; i++) {
639 memset(&rx, 0xff, sizeof(rx));
640 if (ops->get_queue_stats_rx)
641 ops->get_queue_stats_rx(netdev, i, &rx);
642 netdev_nl_stats_add(&rx_sum, &rx, sizeof(rx));
643 }
644 for (i = 0; i < netdev->real_num_tx_queues; i++) {
645 memset(&tx, 0xff, sizeof(tx));
646 if (ops->get_queue_stats_tx)
647 ops->get_queue_stats_tx(netdev, i, &tx);
648 netdev_nl_stats_add(&tx_sum, &tx, sizeof(tx));
649 }
650
651 if (netdev_nl_stats_write_rx(rsp, &rx_sum) ||
652 netdev_nl_stats_write_tx(rsp, &tx_sum))
653 goto nla_put_failure;
654
655 genlmsg_end(rsp, hdr);
656 return 0;
657
658 nla_put_failure:
659 genlmsg_cancel(rsp, hdr);
660 return -EMSGSIZE;
661 }
662
663 static int
664 netdev_nl_qstats_get_dump_one(struct net_device *netdev, unsigned int scope,
665 struct sk_buff *skb, const struct genl_info *info,
666 struct netdev_nl_dump_ctx *ctx)
667 {
668 if (!netdev->stat_ops)
669 return 0;
670
671 switch (scope) {
672 case 0:
673 return netdev_nl_stats_by_netdev(netdev, skb, info);
674 case NETDEV_QSTATS_SCOPE_QUEUE:
675 return netdev_nl_stats_by_queue(netdev, skb, info, ctx);
676 }
677
678 return -EINVAL; /* Should not happen, per netlink policy */
679 }
680
681 int netdev_nl_qstats_get_dumpit(struct sk_buff *skb,
682 struct netlink_callback *cb)
683 {
684 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
685 const struct genl_info *info = genl_info_dump(cb);
686 struct net *net = sock_net(skb->sk);
687 struct net_device *netdev;
688 unsigned int ifindex;
689 unsigned int scope;
690 int err = 0;
691
692 scope = 0;
693 if (info->attrs[NETDEV_A_QSTATS_SCOPE])
694 scope = nla_get_uint(info->attrs[NETDEV_A_QSTATS_SCOPE]);
695
696 ifindex = 0;
697 if (info->attrs[NETDEV_A_QSTATS_IFINDEX])
698 ifindex = nla_get_u32(info->attrs[NETDEV_A_QSTATS_IFINDEX]);
699
700 rtnl_lock();
701 if (ifindex) {
702 netdev = __dev_get_by_index(net, ifindex);
703 if (netdev && netdev->stat_ops) {
704 err = netdev_nl_qstats_get_dump_one(netdev, scope, skb,
705 info, ctx);
706 } else {
707 NL_SET_BAD_ATTR(info->extack,
708 info->attrs[NETDEV_A_QSTATS_IFINDEX]);
709 err = netdev ? -EOPNOTSUPP : -ENODEV;
710 }
711 } else {
712 for_each_netdev_dump(net, netdev, ctx->ifindex) {
713 err = netdev_nl_qstats_get_dump_one(netdev, scope, skb,
714 info, ctx);
715 if (err < 0)
716 break;
717 }
718 }
719 rtnl_unlock();
720
721 return err;
722 }
723
724 static int netdev_genl_netdevice_event(struct notifier_block *nb,
725 unsigned long event, void *ptr)
726 {
727 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
728
729 switch (event) {
730 case NETDEV_REGISTER:
731 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_ADD_NTF);
732 break;
733 case NETDEV_UNREGISTER:
734 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_DEL_NTF);
735 break;
736 case NETDEV_XDP_FEAT_CHANGE:
737 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_CHANGE_NTF);
738 break;
739 }
740
741 return NOTIFY_OK;
742 }
743
744 static struct notifier_block netdev_genl_nb = {
745 .notifier_call = netdev_genl_netdevice_event,
746 };
747
748 static int __init netdev_genl_init(void)
749 {
750 int err;
751
752 err = register_netdevice_notifier(&netdev_genl_nb);
753 if (err)
754 return err;
755
756 err = genl_register_family(&netdev_nl_family);
757 if (err)
758 goto err_unreg_ntf;
759
760 return 0;
761
762 err_unreg_ntf:
763 unregister_netdevice_notifier(&netdev_genl_nb);
764 return err;
765 }
766
767 subsys_initcall(netdev_genl_init);
768
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.