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