Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9a8afc8d NH |
2 | /* |
3 | * Monitoring code for network dropped packet alerts | |
4 | * | |
5 | * Copyright (C) 2009 Neil Horman <nhorman@tuxdriver.com> | |
6 | */ | |
7 | ||
e005d193 JP |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
9a8afc8d NH |
10 | #include <linux/netdevice.h> |
11 | #include <linux/etherdevice.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/if_arp.h> | |
14 | #include <linux/inetdevice.h> | |
15 | #include <linux/inet.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/netpoll.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/netlink.h> | |
23 | #include <linux/net_dropmon.h> | |
24 | #include <linux/percpu.h> | |
25 | #include <linux/timer.h> | |
26 | #include <linux/bitops.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
cad456d5 | 28 | #include <linux/module.h> |
9a8afc8d | 29 | #include <net/genetlink.h> |
4ea7e386 | 30 | #include <net/netevent.h> |
742b8cce | 31 | #include <net/flow_offload.h> |
5855357c | 32 | #include <net/devlink.h> |
9a8afc8d | 33 | |
ad8d75ff | 34 | #include <trace/events/skb.h> |
9cbc1cb8 | 35 | #include <trace/events/napi.h> |
8ee2267a | 36 | #include <trace/events/devlink.h> |
9a8afc8d NH |
37 | |
38 | #include <asm/unaligned.h> | |
39 | ||
40 | #define TRACE_ON 1 | |
41 | #define TRACE_OFF 0 | |
42 | ||
9a8afc8d NH |
43 | /* |
44 | * Globals, our netlink socket pointer | |
45 | * and the work handle that will send up | |
46 | * netlink alerts | |
47 | */ | |
4ea7e386 | 48 | static int trace_state = TRACE_OFF; |
edd3d007 | 49 | static bool monitor_hw; |
dbf896b7 IS |
50 | |
51 | /* net_dm_mutex | |
52 | * | |
53 | * An overall lock guarding every operation coming from userspace. | |
54 | * It also guards the global 'hw_stats_list' list. | |
55 | */ | |
56 | static DEFINE_MUTEX(net_dm_mutex); | |
9a8afc8d | 57 | |
e9feb580 IS |
58 | struct net_dm_stats { |
59 | u64 dropped; | |
60 | struct u64_stats_sync syncp; | |
61 | }; | |
62 | ||
d40e1deb IS |
63 | #define NET_DM_MAX_HW_TRAP_NAME_LEN 40 |
64 | ||
65 | struct net_dm_hw_entry { | |
66 | char trap_name[NET_DM_MAX_HW_TRAP_NAME_LEN]; | |
67 | u32 count; | |
68 | }; | |
69 | ||
70 | struct net_dm_hw_entries { | |
71 | u32 num_entries; | |
d2afb41a | 72 | struct net_dm_hw_entry entries[]; |
d40e1deb IS |
73 | }; |
74 | ||
9a8afc8d | 75 | struct per_cpu_dm_data { |
d40e1deb IS |
76 | spinlock_t lock; /* Protects 'skb', 'hw_entries' and |
77 | * 'send_timer' | |
78 | */ | |
79 | union { | |
80 | struct sk_buff *skb; | |
81 | struct net_dm_hw_entries *hw_entries; | |
82 | }; | |
ca30707d | 83 | struct sk_buff_head drop_queue; |
bec4596b ED |
84 | struct work_struct dm_alert_work; |
85 | struct timer_list send_timer; | |
e9feb580 | 86 | struct net_dm_stats stats; |
9a8afc8d NH |
87 | }; |
88 | ||
4ea7e386 NH |
89 | struct dm_hw_stat_delta { |
90 | struct net_device *dev; | |
5848cc09 | 91 | unsigned long last_rx; |
4ea7e386 NH |
92 | struct list_head list; |
93 | struct rcu_head rcu; | |
94 | unsigned long last_drop_val; | |
95 | }; | |
96 | ||
489111e5 | 97 | static struct genl_family net_drop_monitor_family; |
9a8afc8d NH |
98 | |
99 | static DEFINE_PER_CPU(struct per_cpu_dm_data, dm_cpu_data); | |
cac1174f | 100 | static DEFINE_PER_CPU(struct per_cpu_dm_data, dm_hw_cpu_data); |
9a8afc8d NH |
101 | |
102 | static int dm_hit_limit = 64; | |
103 | static int dm_delay = 1; | |
4ea7e386 NH |
104 | static unsigned long dm_hw_check_delta = 2*HZ; |
105 | static LIST_HEAD(hw_stats_list); | |
9a8afc8d | 106 | |
28315f79 | 107 | static enum net_dm_alert_mode net_dm_alert_mode = NET_DM_ALERT_MODE_SUMMARY; |
57986617 | 108 | static u32 net_dm_trunc_len; |
30328d46 | 109 | static u32 net_dm_queue_len = 1000; |
28315f79 IS |
110 | |
111 | struct net_dm_alert_ops { | |
112 | void (*kfree_skb_probe)(void *ignore, struct sk_buff *skb, | |
113 | void *location); | |
114 | void (*napi_poll_probe)(void *ignore, struct napi_struct *napi, | |
115 | int work, int budget); | |
116 | void (*work_item_func)(struct work_struct *work); | |
5e58109b | 117 | void (*hw_work_item_func)(struct work_struct *work); |
5855357c IS |
118 | void (*hw_trap_probe)(void *ignore, const struct devlink *devlink, |
119 | struct sk_buff *skb, | |
120 | const struct devlink_trap_metadata *metadata); | |
28315f79 IS |
121 | }; |
122 | ||
ca30707d | 123 | struct net_dm_skb_cb { |
5e58109b | 124 | union { |
a848c05f | 125 | struct devlink_trap_metadata *hw_metadata; |
5e58109b IS |
126 | void *pc; |
127 | }; | |
ca30707d IS |
128 | }; |
129 | ||
130 | #define NET_DM_SKB_CB(__skb) ((struct net_dm_skb_cb *)&((__skb)->cb[0])) | |
131 | ||
bec4596b | 132 | static struct sk_buff *reset_per_cpu_data(struct per_cpu_dm_data *data) |
9a8afc8d NH |
133 | { |
134 | size_t al; | |
135 | struct net_dm_alert_msg *msg; | |
683703a2 | 136 | struct nlattr *nla; |
3885ca78 | 137 | struct sk_buff *skb; |
bec4596b | 138 | unsigned long flags; |
4200462d | 139 | void *msg_header; |
9a8afc8d NH |
140 | |
141 | al = sizeof(struct net_dm_alert_msg); | |
142 | al += dm_hit_limit * sizeof(struct net_dm_drop_point); | |
683703a2 NH |
143 | al += sizeof(struct nlattr); |
144 | ||
3885ca78 NH |
145 | skb = genlmsg_new(al, GFP_KERNEL); |
146 | ||
4200462d RW |
147 | if (!skb) |
148 | goto err; | |
3885ca78 | 149 | |
4200462d RW |
150 | msg_header = genlmsg_put(skb, 0, 0, &net_drop_monitor_family, |
151 | 0, NET_DM_CMD_ALERT); | |
152 | if (!msg_header) { | |
153 | nlmsg_free(skb); | |
154 | skb = NULL; | |
155 | goto err; | |
156 | } | |
157 | nla = nla_reserve(skb, NLA_UNSPEC, | |
158 | sizeof(struct net_dm_alert_msg)); | |
159 | if (!nla) { | |
160 | nlmsg_free(skb); | |
161 | skb = NULL; | |
162 | goto err; | |
163 | } | |
164 | msg = nla_data(nla); | |
165 | memset(msg, 0, al); | |
4200462d RW |
166 | goto out; |
167 | ||
168 | err: | |
169 | mod_timer(&data->send_timer, jiffies + HZ / 10); | |
170 | out: | |
bec4596b ED |
171 | spin_lock_irqsave(&data->lock, flags); |
172 | swap(data->skb, skb); | |
173 | spin_unlock_irqrestore(&data->lock, flags); | |
174 | ||
3b48ab22 RW |
175 | if (skb) { |
176 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data; | |
177 | struct genlmsghdr *gnlh = (struct genlmsghdr *)nlmsg_data(nlh); | |
178 | ||
179 | genlmsg_end(skb, genlmsg_data(gnlh)); | |
180 | } | |
181 | ||
bec4596b | 182 | return skb; |
9a8afc8d NH |
183 | } |
184 | ||
85bae4bd | 185 | static const struct genl_multicast_group dropmon_mcgrps[] = { |
2a94fe48 | 186 | { .name = "events", }, |
e5dcecba JB |
187 | }; |
188 | ||
bec4596b | 189 | static void send_dm_alert(struct work_struct *work) |
9a8afc8d NH |
190 | { |
191 | struct sk_buff *skb; | |
bec4596b | 192 | struct per_cpu_dm_data *data; |
9a8afc8d | 193 | |
bec4596b | 194 | data = container_of(work, struct per_cpu_dm_data, dm_alert_work); |
4fdcfa12 | 195 | |
bec4596b | 196 | skb = reset_per_cpu_data(data); |
9a8afc8d | 197 | |
3885ca78 | 198 | if (skb) |
68eb5503 | 199 | genlmsg_multicast(&net_drop_monitor_family, skb, 0, |
2a94fe48 | 200 | 0, GFP_KERNEL); |
9a8afc8d NH |
201 | } |
202 | ||
203 | /* | |
204 | * This is the timer function to delay the sending of an alert | |
205 | * in the event that more drops will arrive during the | |
bec4596b | 206 | * hysteresis period. |
9a8afc8d | 207 | */ |
e99e88a9 | 208 | static void sched_send_work(struct timer_list *t) |
9a8afc8d | 209 | { |
e99e88a9 | 210 | struct per_cpu_dm_data *data = from_timer(data, t, send_timer); |
3885ca78 | 211 | |
bec4596b | 212 | schedule_work(&data->dm_alert_work); |
9a8afc8d NH |
213 | } |
214 | ||
4ea7e386 | 215 | static void trace_drop_common(struct sk_buff *skb, void *location) |
9a8afc8d NH |
216 | { |
217 | struct net_dm_alert_msg *msg; | |
dc30b405 | 218 | struct net_dm_drop_point *point; |
9a8afc8d | 219 | struct nlmsghdr *nlh; |
683703a2 | 220 | struct nlattr *nla; |
9a8afc8d | 221 | int i; |
3885ca78 | 222 | struct sk_buff *dskb; |
bec4596b ED |
223 | struct per_cpu_dm_data *data; |
224 | unsigned long flags; | |
9a8afc8d | 225 | |
bec4596b | 226 | local_irq_save(flags); |
903ceff7 | 227 | data = this_cpu_ptr(&dm_cpu_data); |
bec4596b ED |
228 | spin_lock(&data->lock); |
229 | dskb = data->skb; | |
3885ca78 NH |
230 | |
231 | if (!dskb) | |
232 | goto out; | |
233 | ||
3885ca78 | 234 | nlh = (struct nlmsghdr *)dskb->data; |
683703a2 NH |
235 | nla = genlmsg_data(nlmsg_data(nlh)); |
236 | msg = nla_data(nla); | |
dc30b405 | 237 | point = msg->points; |
9a8afc8d | 238 | for (i = 0; i < msg->entries; i++) { |
dc30b405 AB |
239 | if (!memcmp(&location, &point->pc, sizeof(void *))) { |
240 | point->count++; | |
9a8afc8d NH |
241 | goto out; |
242 | } | |
dc30b405 | 243 | point++; |
9a8afc8d | 244 | } |
bec4596b ED |
245 | if (msg->entries == dm_hit_limit) |
246 | goto out; | |
9a8afc8d NH |
247 | /* |
248 | * We need to create a new entry | |
249 | */ | |
3885ca78 | 250 | __nla_reserve_nohdr(dskb, sizeof(struct net_dm_drop_point)); |
683703a2 | 251 | nla->nla_len += NLA_ALIGN(sizeof(struct net_dm_drop_point)); |
dc30b405 AB |
252 | memcpy(point->pc, &location, sizeof(void *)); |
253 | point->count = 1; | |
9a8afc8d NH |
254 | msg->entries++; |
255 | ||
256 | if (!timer_pending(&data->send_timer)) { | |
257 | data->send_timer.expires = jiffies + dm_delay * HZ; | |
bec4596b | 258 | add_timer(&data->send_timer); |
9a8afc8d NH |
259 | } |
260 | ||
261 | out: | |
bec4596b | 262 | spin_unlock_irqrestore(&data->lock, flags); |
9a8afc8d NH |
263 | } |
264 | ||
38516ab5 | 265 | static void trace_kfree_skb_hit(void *ignore, struct sk_buff *skb, void *location) |
4ea7e386 NH |
266 | { |
267 | trace_drop_common(skb, location); | |
268 | } | |
269 | ||
1db19db7 JDB |
270 | static void trace_napi_poll_hit(void *ignore, struct napi_struct *napi, |
271 | int work, int budget) | |
4ea7e386 NH |
272 | { |
273 | struct dm_hw_stat_delta *new_stat; | |
274 | ||
275 | /* | |
5848cc09 | 276 | * Don't check napi structures with no associated device |
4ea7e386 | 277 | */ |
5848cc09 | 278 | if (!napi->dev) |
4ea7e386 NH |
279 | return; |
280 | ||
281 | rcu_read_lock(); | |
282 | list_for_each_entry_rcu(new_stat, &hw_stats_list, list) { | |
5848cc09 NH |
283 | /* |
284 | * only add a note to our monitor buffer if: | |
285 | * 1) this is the dev we received on | |
286 | * 2) its after the last_rx delta | |
287 | * 3) our rx_dropped count has gone up | |
288 | */ | |
4ea7e386 | 289 | if ((new_stat->dev == napi->dev) && |
5848cc09 | 290 | (time_after(jiffies, new_stat->last_rx + dm_hw_check_delta)) && |
4ea7e386 NH |
291 | (napi->dev->stats.rx_dropped != new_stat->last_drop_val)) { |
292 | trace_drop_common(NULL, NULL); | |
293 | new_stat->last_drop_val = napi->dev->stats.rx_dropped; | |
5848cc09 | 294 | new_stat->last_rx = jiffies; |
4ea7e386 NH |
295 | break; |
296 | } | |
297 | } | |
298 | rcu_read_unlock(); | |
299 | } | |
300 | ||
d40e1deb IS |
301 | static struct net_dm_hw_entries * |
302 | net_dm_hw_reset_per_cpu_data(struct per_cpu_dm_data *hw_data) | |
303 | { | |
304 | struct net_dm_hw_entries *hw_entries; | |
305 | unsigned long flags; | |
306 | ||
307 | hw_entries = kzalloc(struct_size(hw_entries, entries, dm_hit_limit), | |
308 | GFP_KERNEL); | |
309 | if (!hw_entries) { | |
310 | /* If the memory allocation failed, we try to perform another | |
311 | * allocation in 1/10 second. Otherwise, the probe function | |
312 | * will constantly bail out. | |
313 | */ | |
314 | mod_timer(&hw_data->send_timer, jiffies + HZ / 10); | |
315 | } | |
316 | ||
317 | spin_lock_irqsave(&hw_data->lock, flags); | |
318 | swap(hw_data->hw_entries, hw_entries); | |
319 | spin_unlock_irqrestore(&hw_data->lock, flags); | |
320 | ||
321 | return hw_entries; | |
322 | } | |
323 | ||
324 | static int net_dm_hw_entry_put(struct sk_buff *msg, | |
325 | const struct net_dm_hw_entry *hw_entry) | |
326 | { | |
327 | struct nlattr *attr; | |
328 | ||
329 | attr = nla_nest_start(msg, NET_DM_ATTR_HW_ENTRY); | |
330 | if (!attr) | |
331 | return -EMSGSIZE; | |
332 | ||
333 | if (nla_put_string(msg, NET_DM_ATTR_HW_TRAP_NAME, hw_entry->trap_name)) | |
334 | goto nla_put_failure; | |
335 | ||
336 | if (nla_put_u32(msg, NET_DM_ATTR_HW_TRAP_COUNT, hw_entry->count)) | |
337 | goto nla_put_failure; | |
338 | ||
339 | nla_nest_end(msg, attr); | |
340 | ||
341 | return 0; | |
342 | ||
343 | nla_put_failure: | |
344 | nla_nest_cancel(msg, attr); | |
345 | return -EMSGSIZE; | |
346 | } | |
347 | ||
348 | static int net_dm_hw_entries_put(struct sk_buff *msg, | |
349 | const struct net_dm_hw_entries *hw_entries) | |
350 | { | |
351 | struct nlattr *attr; | |
352 | int i; | |
353 | ||
354 | attr = nla_nest_start(msg, NET_DM_ATTR_HW_ENTRIES); | |
355 | if (!attr) | |
356 | return -EMSGSIZE; | |
357 | ||
358 | for (i = 0; i < hw_entries->num_entries; i++) { | |
359 | int rc; | |
360 | ||
361 | rc = net_dm_hw_entry_put(msg, &hw_entries->entries[i]); | |
362 | if (rc) | |
363 | goto nla_put_failure; | |
364 | } | |
365 | ||
366 | nla_nest_end(msg, attr); | |
367 | ||
368 | return 0; | |
369 | ||
370 | nla_put_failure: | |
371 | nla_nest_cancel(msg, attr); | |
372 | return -EMSGSIZE; | |
373 | } | |
374 | ||
375 | static int | |
376 | net_dm_hw_summary_report_fill(struct sk_buff *msg, | |
377 | const struct net_dm_hw_entries *hw_entries) | |
378 | { | |
379 | struct net_dm_alert_msg anc_hdr = { 0 }; | |
380 | void *hdr; | |
381 | int rc; | |
382 | ||
383 | hdr = genlmsg_put(msg, 0, 0, &net_drop_monitor_family, 0, | |
384 | NET_DM_CMD_ALERT); | |
385 | if (!hdr) | |
386 | return -EMSGSIZE; | |
387 | ||
388 | /* We need to put the ancillary header in order not to break user | |
389 | * space. | |
390 | */ | |
391 | if (nla_put(msg, NLA_UNSPEC, sizeof(anc_hdr), &anc_hdr)) | |
392 | goto nla_put_failure; | |
393 | ||
394 | rc = net_dm_hw_entries_put(msg, hw_entries); | |
395 | if (rc) | |
396 | goto nla_put_failure; | |
397 | ||
398 | genlmsg_end(msg, hdr); | |
399 | ||
400 | return 0; | |
401 | ||
402 | nla_put_failure: | |
403 | genlmsg_cancel(msg, hdr); | |
404 | return -EMSGSIZE; | |
405 | } | |
406 | ||
407 | static void net_dm_hw_summary_work(struct work_struct *work) | |
408 | { | |
409 | struct net_dm_hw_entries *hw_entries; | |
410 | struct per_cpu_dm_data *hw_data; | |
411 | struct sk_buff *msg; | |
412 | int rc; | |
413 | ||
414 | hw_data = container_of(work, struct per_cpu_dm_data, dm_alert_work); | |
415 | ||
416 | hw_entries = net_dm_hw_reset_per_cpu_data(hw_data); | |
417 | if (!hw_entries) | |
418 | return; | |
419 | ||
420 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
421 | if (!msg) | |
422 | goto out; | |
423 | ||
424 | rc = net_dm_hw_summary_report_fill(msg, hw_entries); | |
425 | if (rc) { | |
426 | nlmsg_free(msg); | |
427 | goto out; | |
428 | } | |
429 | ||
430 | genlmsg_multicast(&net_drop_monitor_family, msg, 0, 0, GFP_KERNEL); | |
431 | ||
432 | out: | |
433 | kfree(hw_entries); | |
434 | } | |
435 | ||
5855357c IS |
436 | static void |
437 | net_dm_hw_trap_summary_probe(void *ignore, const struct devlink *devlink, | |
438 | struct sk_buff *skb, | |
439 | const struct devlink_trap_metadata *metadata) | |
440 | { | |
441 | struct net_dm_hw_entries *hw_entries; | |
442 | struct net_dm_hw_entry *hw_entry; | |
443 | struct per_cpu_dm_data *hw_data; | |
444 | unsigned long flags; | |
445 | int i; | |
446 | ||
93e15596 IS |
447 | if (metadata->trap_type == DEVLINK_TRAP_TYPE_CONTROL) |
448 | return; | |
449 | ||
5855357c IS |
450 | hw_data = this_cpu_ptr(&dm_hw_cpu_data); |
451 | spin_lock_irqsave(&hw_data->lock, flags); | |
452 | hw_entries = hw_data->hw_entries; | |
453 | ||
454 | if (!hw_entries) | |
455 | goto out; | |
456 | ||
457 | for (i = 0; i < hw_entries->num_entries; i++) { | |
458 | hw_entry = &hw_entries->entries[i]; | |
459 | if (!strncmp(hw_entry->trap_name, metadata->trap_name, | |
460 | NET_DM_MAX_HW_TRAP_NAME_LEN - 1)) { | |
461 | hw_entry->count++; | |
462 | goto out; | |
463 | } | |
464 | } | |
465 | if (WARN_ON_ONCE(hw_entries->num_entries == dm_hit_limit)) | |
466 | goto out; | |
467 | ||
468 | hw_entry = &hw_entries->entries[hw_entries->num_entries]; | |
469 | strlcpy(hw_entry->trap_name, metadata->trap_name, | |
470 | NET_DM_MAX_HW_TRAP_NAME_LEN - 1); | |
471 | hw_entry->count = 1; | |
472 | hw_entries->num_entries++; | |
473 | ||
474 | if (!timer_pending(&hw_data->send_timer)) { | |
475 | hw_data->send_timer.expires = jiffies + dm_delay * HZ; | |
476 | add_timer(&hw_data->send_timer); | |
477 | } | |
478 | ||
479 | out: | |
480 | spin_unlock_irqrestore(&hw_data->lock, flags); | |
481 | } | |
482 | ||
28315f79 IS |
483 | static const struct net_dm_alert_ops net_dm_alert_summary_ops = { |
484 | .kfree_skb_probe = trace_kfree_skb_hit, | |
485 | .napi_poll_probe = trace_napi_poll_hit, | |
486 | .work_item_func = send_dm_alert, | |
d40e1deb | 487 | .hw_work_item_func = net_dm_hw_summary_work, |
5855357c | 488 | .hw_trap_probe = net_dm_hw_trap_summary_probe, |
28315f79 IS |
489 | }; |
490 | ||
ca30707d IS |
491 | static void net_dm_packet_trace_kfree_skb_hit(void *ignore, |
492 | struct sk_buff *skb, | |
493 | void *location) | |
494 | { | |
495 | ktime_t tstamp = ktime_get_real(); | |
496 | struct per_cpu_dm_data *data; | |
497 | struct sk_buff *nskb; | |
498 | unsigned long flags; | |
499 | ||
bef17466 IS |
500 | if (!skb_mac_header_was_set(skb)) |
501 | return; | |
502 | ||
ca30707d IS |
503 | nskb = skb_clone(skb, GFP_ATOMIC); |
504 | if (!nskb) | |
505 | return; | |
506 | ||
507 | NET_DM_SKB_CB(nskb)->pc = location; | |
508 | /* Override the timestamp because we care about the time when the | |
509 | * packet was dropped. | |
510 | */ | |
511 | nskb->tstamp = tstamp; | |
512 | ||
513 | data = this_cpu_ptr(&dm_cpu_data); | |
514 | ||
515 | spin_lock_irqsave(&data->drop_queue.lock, flags); | |
30328d46 | 516 | if (skb_queue_len(&data->drop_queue) < net_dm_queue_len) |
ca30707d IS |
517 | __skb_queue_tail(&data->drop_queue, nskb); |
518 | else | |
519 | goto unlock_free; | |
520 | spin_unlock_irqrestore(&data->drop_queue.lock, flags); | |
521 | ||
522 | schedule_work(&data->dm_alert_work); | |
523 | ||
524 | return; | |
525 | ||
526 | unlock_free: | |
527 | spin_unlock_irqrestore(&data->drop_queue.lock, flags); | |
e9feb580 IS |
528 | u64_stats_update_begin(&data->stats.syncp); |
529 | data->stats.dropped++; | |
530 | u64_stats_update_end(&data->stats.syncp); | |
ca30707d IS |
531 | consume_skb(nskb); |
532 | } | |
533 | ||
534 | static void net_dm_packet_trace_napi_poll_hit(void *ignore, | |
535 | struct napi_struct *napi, | |
536 | int work, int budget) | |
537 | { | |
538 | } | |
539 | ||
540 | static size_t net_dm_in_port_size(void) | |
541 | { | |
542 | /* NET_DM_ATTR_IN_PORT nest */ | |
543 | return nla_total_size(0) + | |
544 | /* NET_DM_ATTR_PORT_NETDEV_IFINDEX */ | |
5e58109b IS |
545 | nla_total_size(sizeof(u32)) + |
546 | /* NET_DM_ATTR_PORT_NETDEV_NAME */ | |
547 | nla_total_size(IFNAMSIZ + 1); | |
ca30707d IS |
548 | } |
549 | ||
550 | #define NET_DM_MAX_SYMBOL_LEN 40 | |
551 | ||
552 | static size_t net_dm_packet_report_size(size_t payload_len) | |
553 | { | |
554 | size_t size; | |
555 | ||
556 | size = nlmsg_msg_size(GENL_HDRLEN + net_drop_monitor_family.hdrsize); | |
557 | ||
558 | return NLMSG_ALIGN(size) + | |
5e58109b IS |
559 | /* NET_DM_ATTR_ORIGIN */ |
560 | nla_total_size(sizeof(u16)) + | |
ca30707d IS |
561 | /* NET_DM_ATTR_PC */ |
562 | nla_total_size(sizeof(u64)) + | |
563 | /* NET_DM_ATTR_SYMBOL */ | |
564 | nla_total_size(NET_DM_MAX_SYMBOL_LEN + 1) + | |
565 | /* NET_DM_ATTR_IN_PORT */ | |
566 | net_dm_in_port_size() + | |
567 | /* NET_DM_ATTR_TIMESTAMP */ | |
bd1200b7 | 568 | nla_total_size(sizeof(u64)) + |
57986617 IS |
569 | /* NET_DM_ATTR_ORIG_LEN */ |
570 | nla_total_size(sizeof(u32)) + | |
ca30707d IS |
571 | /* NET_DM_ATTR_PROTO */ |
572 | nla_total_size(sizeof(u16)) + | |
573 | /* NET_DM_ATTR_PAYLOAD */ | |
574 | nla_total_size(payload_len); | |
575 | } | |
576 | ||
5e58109b IS |
577 | static int net_dm_packet_report_in_port_put(struct sk_buff *msg, int ifindex, |
578 | const char *name) | |
ca30707d IS |
579 | { |
580 | struct nlattr *attr; | |
581 | ||
582 | attr = nla_nest_start(msg, NET_DM_ATTR_IN_PORT); | |
583 | if (!attr) | |
584 | return -EMSGSIZE; | |
585 | ||
586 | if (ifindex && | |
587 | nla_put_u32(msg, NET_DM_ATTR_PORT_NETDEV_IFINDEX, ifindex)) | |
588 | goto nla_put_failure; | |
589 | ||
5e58109b IS |
590 | if (name && nla_put_string(msg, NET_DM_ATTR_PORT_NETDEV_NAME, name)) |
591 | goto nla_put_failure; | |
592 | ||
ca30707d IS |
593 | nla_nest_end(msg, attr); |
594 | ||
595 | return 0; | |
596 | ||
597 | nla_put_failure: | |
598 | nla_nest_cancel(msg, attr); | |
599 | return -EMSGSIZE; | |
600 | } | |
601 | ||
602 | static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, | |
603 | size_t payload_len) | |
604 | { | |
605 | u64 pc = (u64)(uintptr_t) NET_DM_SKB_CB(skb)->pc; | |
606 | char buf[NET_DM_MAX_SYMBOL_LEN]; | |
607 | struct nlattr *attr; | |
ca30707d IS |
608 | void *hdr; |
609 | int rc; | |
610 | ||
611 | hdr = genlmsg_put(msg, 0, 0, &net_drop_monitor_family, 0, | |
612 | NET_DM_CMD_PACKET_ALERT); | |
613 | if (!hdr) | |
614 | return -EMSGSIZE; | |
615 | ||
5e58109b IS |
616 | if (nla_put_u16(msg, NET_DM_ATTR_ORIGIN, NET_DM_ORIGIN_SW)) |
617 | goto nla_put_failure; | |
618 | ||
ca30707d IS |
619 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_PC, pc, NET_DM_ATTR_PAD)) |
620 | goto nla_put_failure; | |
621 | ||
622 | snprintf(buf, sizeof(buf), "%pS", NET_DM_SKB_CB(skb)->pc); | |
623 | if (nla_put_string(msg, NET_DM_ATTR_SYMBOL, buf)) | |
624 | goto nla_put_failure; | |
625 | ||
5e58109b | 626 | rc = net_dm_packet_report_in_port_put(msg, skb->skb_iif, NULL); |
ca30707d IS |
627 | if (rc) |
628 | goto nla_put_failure; | |
629 | ||
bd1200b7 IS |
630 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_TIMESTAMP, |
631 | ktime_to_ns(skb->tstamp), NET_DM_ATTR_PAD)) | |
ca30707d IS |
632 | goto nla_put_failure; |
633 | ||
57986617 IS |
634 | if (nla_put_u32(msg, NET_DM_ATTR_ORIG_LEN, skb->len)) |
635 | goto nla_put_failure; | |
636 | ||
ca30707d IS |
637 | if (!payload_len) |
638 | goto out; | |
639 | ||
640 | if (nla_put_u16(msg, NET_DM_ATTR_PROTO, be16_to_cpu(skb->protocol))) | |
641 | goto nla_put_failure; | |
642 | ||
643 | attr = skb_put(msg, nla_total_size(payload_len)); | |
644 | attr->nla_type = NET_DM_ATTR_PAYLOAD; | |
645 | attr->nla_len = nla_attr_size(payload_len); | |
646 | if (skb_copy_bits(skb, 0, nla_data(attr), payload_len)) | |
647 | goto nla_put_failure; | |
648 | ||
649 | out: | |
650 | genlmsg_end(msg, hdr); | |
651 | ||
652 | return 0; | |
653 | ||
654 | nla_put_failure: | |
655 | genlmsg_cancel(msg, hdr); | |
656 | return -EMSGSIZE; | |
657 | } | |
658 | ||
659 | #define NET_DM_MAX_PACKET_SIZE (0xffff - NLA_HDRLEN - NLA_ALIGNTO) | |
660 | ||
661 | static void net_dm_packet_report(struct sk_buff *skb) | |
662 | { | |
663 | struct sk_buff *msg; | |
664 | size_t payload_len; | |
665 | int rc; | |
666 | ||
667 | /* Make sure we start copying the packet from the MAC header */ | |
668 | if (skb->data > skb_mac_header(skb)) | |
669 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
670 | else | |
671 | skb_pull(skb, skb_mac_header(skb) - skb->data); | |
672 | ||
673 | /* Ensure packet fits inside a single netlink attribute */ | |
674 | payload_len = min_t(size_t, skb->len, NET_DM_MAX_PACKET_SIZE); | |
57986617 IS |
675 | if (net_dm_trunc_len) |
676 | payload_len = min_t(size_t, net_dm_trunc_len, payload_len); | |
ca30707d IS |
677 | |
678 | msg = nlmsg_new(net_dm_packet_report_size(payload_len), GFP_KERNEL); | |
679 | if (!msg) | |
680 | goto out; | |
681 | ||
682 | rc = net_dm_packet_report_fill(msg, skb, payload_len); | |
683 | if (rc) { | |
684 | nlmsg_free(msg); | |
685 | goto out; | |
686 | } | |
687 | ||
688 | genlmsg_multicast(&net_drop_monitor_family, msg, 0, 0, GFP_KERNEL); | |
689 | ||
690 | out: | |
691 | consume_skb(skb); | |
692 | } | |
693 | ||
694 | static void net_dm_packet_work(struct work_struct *work) | |
695 | { | |
696 | struct per_cpu_dm_data *data; | |
697 | struct sk_buff_head list; | |
698 | struct sk_buff *skb; | |
699 | unsigned long flags; | |
700 | ||
701 | data = container_of(work, struct per_cpu_dm_data, dm_alert_work); | |
702 | ||
703 | __skb_queue_head_init(&list); | |
704 | ||
705 | spin_lock_irqsave(&data->drop_queue.lock, flags); | |
706 | skb_queue_splice_tail_init(&data->drop_queue, &list); | |
707 | spin_unlock_irqrestore(&data->drop_queue.lock, flags); | |
708 | ||
709 | while ((skb = __skb_dequeue(&list))) | |
710 | net_dm_packet_report(skb); | |
711 | } | |
712 | ||
742b8cce | 713 | static size_t |
a848c05f | 714 | net_dm_flow_action_cookie_size(const struct devlink_trap_metadata *hw_metadata) |
742b8cce JP |
715 | { |
716 | return hw_metadata->fa_cookie ? | |
717 | nla_total_size(hw_metadata->fa_cookie->cookie_len) : 0; | |
718 | } | |
719 | ||
5e58109b IS |
720 | static size_t |
721 | net_dm_hw_packet_report_size(size_t payload_len, | |
a848c05f | 722 | const struct devlink_trap_metadata *hw_metadata) |
5e58109b IS |
723 | { |
724 | size_t size; | |
725 | ||
726 | size = nlmsg_msg_size(GENL_HDRLEN + net_drop_monitor_family.hdrsize); | |
727 | ||
728 | return NLMSG_ALIGN(size) + | |
729 | /* NET_DM_ATTR_ORIGIN */ | |
730 | nla_total_size(sizeof(u16)) + | |
731 | /* NET_DM_ATTR_HW_TRAP_GROUP_NAME */ | |
732 | nla_total_size(strlen(hw_metadata->trap_group_name) + 1) + | |
733 | /* NET_DM_ATTR_HW_TRAP_NAME */ | |
734 | nla_total_size(strlen(hw_metadata->trap_name) + 1) + | |
735 | /* NET_DM_ATTR_IN_PORT */ | |
736 | net_dm_in_port_size() + | |
742b8cce JP |
737 | /* NET_DM_ATTR_FLOW_ACTION_COOKIE */ |
738 | net_dm_flow_action_cookie_size(hw_metadata) + | |
5e58109b | 739 | /* NET_DM_ATTR_TIMESTAMP */ |
bd1200b7 | 740 | nla_total_size(sizeof(u64)) + |
5e58109b IS |
741 | /* NET_DM_ATTR_ORIG_LEN */ |
742 | nla_total_size(sizeof(u32)) + | |
743 | /* NET_DM_ATTR_PROTO */ | |
744 | nla_total_size(sizeof(u16)) + | |
745 | /* NET_DM_ATTR_PAYLOAD */ | |
746 | nla_total_size(payload_len); | |
747 | } | |
748 | ||
749 | static int net_dm_hw_packet_report_fill(struct sk_buff *msg, | |
750 | struct sk_buff *skb, size_t payload_len) | |
751 | { | |
a848c05f | 752 | struct devlink_trap_metadata *hw_metadata; |
5e58109b | 753 | struct nlattr *attr; |
5e58109b IS |
754 | void *hdr; |
755 | ||
756 | hw_metadata = NET_DM_SKB_CB(skb)->hw_metadata; | |
757 | ||
758 | hdr = genlmsg_put(msg, 0, 0, &net_drop_monitor_family, 0, | |
759 | NET_DM_CMD_PACKET_ALERT); | |
760 | if (!hdr) | |
761 | return -EMSGSIZE; | |
762 | ||
763 | if (nla_put_u16(msg, NET_DM_ATTR_ORIGIN, NET_DM_ORIGIN_HW)) | |
764 | goto nla_put_failure; | |
765 | ||
766 | if (nla_put_string(msg, NET_DM_ATTR_HW_TRAP_GROUP_NAME, | |
767 | hw_metadata->trap_group_name)) | |
768 | goto nla_put_failure; | |
769 | ||
770 | if (nla_put_string(msg, NET_DM_ATTR_HW_TRAP_NAME, | |
771 | hw_metadata->trap_name)) | |
772 | goto nla_put_failure; | |
773 | ||
774 | if (hw_metadata->input_dev) { | |
775 | struct net_device *dev = hw_metadata->input_dev; | |
776 | int rc; | |
777 | ||
778 | rc = net_dm_packet_report_in_port_put(msg, dev->ifindex, | |
779 | dev->name); | |
780 | if (rc) | |
781 | goto nla_put_failure; | |
782 | } | |
783 | ||
742b8cce JP |
784 | if (hw_metadata->fa_cookie && |
785 | nla_put(msg, NET_DM_ATTR_FLOW_ACTION_COOKIE, | |
786 | hw_metadata->fa_cookie->cookie_len, | |
787 | hw_metadata->fa_cookie->cookie)) | |
788 | goto nla_put_failure; | |
789 | ||
bd1200b7 IS |
790 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_TIMESTAMP, |
791 | ktime_to_ns(skb->tstamp), NET_DM_ATTR_PAD)) | |
5e58109b IS |
792 | goto nla_put_failure; |
793 | ||
794 | if (nla_put_u32(msg, NET_DM_ATTR_ORIG_LEN, skb->len)) | |
795 | goto nla_put_failure; | |
796 | ||
797 | if (!payload_len) | |
798 | goto out; | |
799 | ||
800 | if (nla_put_u16(msg, NET_DM_ATTR_PROTO, be16_to_cpu(skb->protocol))) | |
801 | goto nla_put_failure; | |
802 | ||
803 | attr = skb_put(msg, nla_total_size(payload_len)); | |
804 | attr->nla_type = NET_DM_ATTR_PAYLOAD; | |
805 | attr->nla_len = nla_attr_size(payload_len); | |
806 | if (skb_copy_bits(skb, 0, nla_data(attr), payload_len)) | |
807 | goto nla_put_failure; | |
808 | ||
809 | out: | |
810 | genlmsg_end(msg, hdr); | |
811 | ||
812 | return 0; | |
813 | ||
814 | nla_put_failure: | |
815 | genlmsg_cancel(msg, hdr); | |
816 | return -EMSGSIZE; | |
817 | } | |
818 | ||
a848c05f | 819 | static struct devlink_trap_metadata * |
5855357c IS |
820 | net_dm_hw_metadata_copy(const struct devlink_trap_metadata *metadata) |
821 | { | |
822 | const struct flow_action_cookie *fa_cookie; | |
a848c05f | 823 | struct devlink_trap_metadata *hw_metadata; |
5855357c IS |
824 | const char *trap_group_name; |
825 | const char *trap_name; | |
826 | ||
827 | hw_metadata = kzalloc(sizeof(*hw_metadata), GFP_ATOMIC); | |
828 | if (!hw_metadata) | |
829 | return NULL; | |
830 | ||
831 | trap_group_name = kstrdup(metadata->trap_group_name, GFP_ATOMIC); | |
832 | if (!trap_group_name) | |
833 | goto free_hw_metadata; | |
834 | hw_metadata->trap_group_name = trap_group_name; | |
835 | ||
836 | trap_name = kstrdup(metadata->trap_name, GFP_ATOMIC); | |
837 | if (!trap_name) | |
838 | goto free_trap_group; | |
839 | hw_metadata->trap_name = trap_name; | |
840 | ||
841 | if (metadata->fa_cookie) { | |
842 | size_t cookie_size = sizeof(*fa_cookie) + | |
843 | metadata->fa_cookie->cookie_len; | |
844 | ||
845 | fa_cookie = kmemdup(metadata->fa_cookie, cookie_size, | |
846 | GFP_ATOMIC); | |
847 | if (!fa_cookie) | |
848 | goto free_trap_name; | |
849 | hw_metadata->fa_cookie = fa_cookie; | |
850 | } | |
851 | ||
852 | hw_metadata->input_dev = metadata->input_dev; | |
853 | if (hw_metadata->input_dev) | |
854 | dev_hold(hw_metadata->input_dev); | |
855 | ||
856 | return hw_metadata; | |
857 | ||
858 | free_trap_name: | |
859 | kfree(trap_name); | |
860 | free_trap_group: | |
861 | kfree(trap_group_name); | |
862 | free_hw_metadata: | |
863 | kfree(hw_metadata); | |
864 | return NULL; | |
865 | } | |
866 | ||
5e58109b | 867 | static void |
a848c05f | 868 | net_dm_hw_metadata_free(const struct devlink_trap_metadata *hw_metadata) |
5e58109b IS |
869 | { |
870 | if (hw_metadata->input_dev) | |
871 | dev_put(hw_metadata->input_dev); | |
742b8cce | 872 | kfree(hw_metadata->fa_cookie); |
5e58109b IS |
873 | kfree(hw_metadata->trap_name); |
874 | kfree(hw_metadata->trap_group_name); | |
875 | kfree(hw_metadata); | |
876 | } | |
877 | ||
878 | static void net_dm_hw_packet_report(struct sk_buff *skb) | |
879 | { | |
a848c05f | 880 | struct devlink_trap_metadata *hw_metadata; |
5e58109b IS |
881 | struct sk_buff *msg; |
882 | size_t payload_len; | |
883 | int rc; | |
884 | ||
885 | if (skb->data > skb_mac_header(skb)) | |
886 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
887 | else | |
888 | skb_pull(skb, skb_mac_header(skb) - skb->data); | |
889 | ||
890 | payload_len = min_t(size_t, skb->len, NET_DM_MAX_PACKET_SIZE); | |
891 | if (net_dm_trunc_len) | |
892 | payload_len = min_t(size_t, net_dm_trunc_len, payload_len); | |
893 | ||
894 | hw_metadata = NET_DM_SKB_CB(skb)->hw_metadata; | |
895 | msg = nlmsg_new(net_dm_hw_packet_report_size(payload_len, hw_metadata), | |
896 | GFP_KERNEL); | |
897 | if (!msg) | |
898 | goto out; | |
899 | ||
900 | rc = net_dm_hw_packet_report_fill(msg, skb, payload_len); | |
901 | if (rc) { | |
902 | nlmsg_free(msg); | |
903 | goto out; | |
904 | } | |
905 | ||
906 | genlmsg_multicast(&net_drop_monitor_family, msg, 0, 0, GFP_KERNEL); | |
907 | ||
908 | out: | |
909 | net_dm_hw_metadata_free(NET_DM_SKB_CB(skb)->hw_metadata); | |
910 | consume_skb(skb); | |
911 | } | |
912 | ||
913 | static void net_dm_hw_packet_work(struct work_struct *work) | |
914 | { | |
915 | struct per_cpu_dm_data *hw_data; | |
916 | struct sk_buff_head list; | |
917 | struct sk_buff *skb; | |
918 | unsigned long flags; | |
919 | ||
920 | hw_data = container_of(work, struct per_cpu_dm_data, dm_alert_work); | |
921 | ||
922 | __skb_queue_head_init(&list); | |
923 | ||
924 | spin_lock_irqsave(&hw_data->drop_queue.lock, flags); | |
925 | skb_queue_splice_tail_init(&hw_data->drop_queue, &list); | |
926 | spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags); | |
927 | ||
928 | while ((skb = __skb_dequeue(&list))) | |
929 | net_dm_hw_packet_report(skb); | |
930 | } | |
931 | ||
5855357c IS |
932 | static void |
933 | net_dm_hw_trap_packet_probe(void *ignore, const struct devlink *devlink, | |
934 | struct sk_buff *skb, | |
935 | const struct devlink_trap_metadata *metadata) | |
936 | { | |
a848c05f | 937 | struct devlink_trap_metadata *n_hw_metadata; |
5855357c IS |
938 | ktime_t tstamp = ktime_get_real(); |
939 | struct per_cpu_dm_data *hw_data; | |
940 | struct sk_buff *nskb; | |
941 | unsigned long flags; | |
942 | ||
93e15596 IS |
943 | if (metadata->trap_type == DEVLINK_TRAP_TYPE_CONTROL) |
944 | return; | |
945 | ||
5855357c IS |
946 | if (!skb_mac_header_was_set(skb)) |
947 | return; | |
948 | ||
949 | nskb = skb_clone(skb, GFP_ATOMIC); | |
950 | if (!nskb) | |
951 | return; | |
952 | ||
953 | n_hw_metadata = net_dm_hw_metadata_copy(metadata); | |
954 | if (!n_hw_metadata) | |
955 | goto free; | |
956 | ||
957 | NET_DM_SKB_CB(nskb)->hw_metadata = n_hw_metadata; | |
958 | nskb->tstamp = tstamp; | |
959 | ||
960 | hw_data = this_cpu_ptr(&dm_hw_cpu_data); | |
961 | ||
962 | spin_lock_irqsave(&hw_data->drop_queue.lock, flags); | |
963 | if (skb_queue_len(&hw_data->drop_queue) < net_dm_queue_len) | |
964 | __skb_queue_tail(&hw_data->drop_queue, nskb); | |
965 | else | |
966 | goto unlock_free; | |
967 | spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags); | |
968 | ||
969 | schedule_work(&hw_data->dm_alert_work); | |
970 | ||
971 | return; | |
972 | ||
973 | unlock_free: | |
974 | spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags); | |
975 | u64_stats_update_begin(&hw_data->stats.syncp); | |
976 | hw_data->stats.dropped++; | |
977 | u64_stats_update_end(&hw_data->stats.syncp); | |
978 | net_dm_hw_metadata_free(n_hw_metadata); | |
979 | free: | |
980 | consume_skb(nskb); | |
981 | } | |
982 | ||
ca30707d IS |
983 | static const struct net_dm_alert_ops net_dm_alert_packet_ops = { |
984 | .kfree_skb_probe = net_dm_packet_trace_kfree_skb_hit, | |
985 | .napi_poll_probe = net_dm_packet_trace_napi_poll_hit, | |
986 | .work_item_func = net_dm_packet_work, | |
5e58109b | 987 | .hw_work_item_func = net_dm_hw_packet_work, |
5855357c | 988 | .hw_trap_probe = net_dm_hw_trap_packet_probe, |
ca30707d IS |
989 | }; |
990 | ||
28315f79 IS |
991 | static const struct net_dm_alert_ops *net_dm_alert_ops_arr[] = { |
992 | [NET_DM_ALERT_MODE_SUMMARY] = &net_dm_alert_summary_ops, | |
ca30707d | 993 | [NET_DM_ALERT_MODE_PACKET] = &net_dm_alert_packet_ops, |
28315f79 IS |
994 | }; |
995 | ||
8ee2267a IS |
996 | #if IS_ENABLED(CONFIG_NET_DEVLINK) |
997 | static int net_dm_hw_probe_register(const struct net_dm_alert_ops *ops) | |
edd3d007 | 998 | { |
8ee2267a IS |
999 | return register_trace_devlink_trap_report(ops->hw_trap_probe, NULL); |
1000 | } | |
edd3d007 | 1001 | |
8ee2267a IS |
1002 | static void net_dm_hw_probe_unregister(const struct net_dm_alert_ops *ops) |
1003 | { | |
1004 | unregister_trace_devlink_trap_report(ops->hw_trap_probe, NULL); | |
1005 | tracepoint_synchronize_unregister(); | |
1006 | } | |
1007 | #else | |
1008 | static int net_dm_hw_probe_register(const struct net_dm_alert_ops *ops) | |
1009 | { | |
1010 | return -EOPNOTSUPP; | |
1011 | } | |
8e94c3bc | 1012 | |
8ee2267a IS |
1013 | static void net_dm_hw_probe_unregister(const struct net_dm_alert_ops *ops) |
1014 | { | |
edd3d007 | 1015 | } |
8ee2267a | 1016 | #endif |
edd3d007 | 1017 | |
8e94c3bc IS |
1018 | static int net_dm_hw_monitor_start(struct netlink_ext_ack *extack) |
1019 | { | |
1020 | const struct net_dm_alert_ops *ops; | |
8ee2267a | 1021 | int cpu, rc; |
8e94c3bc IS |
1022 | |
1023 | if (monitor_hw) { | |
1024 | NL_SET_ERR_MSG_MOD(extack, "Hardware monitoring already enabled"); | |
1025 | return -EAGAIN; | |
1026 | } | |
1027 | ||
1028 | ops = net_dm_alert_ops_arr[net_dm_alert_mode]; | |
1029 | ||
1030 | if (!try_module_get(THIS_MODULE)) { | |
1031 | NL_SET_ERR_MSG_MOD(extack, "Failed to take reference on module"); | |
1032 | return -ENODEV; | |
1033 | } | |
1034 | ||
1035 | for_each_possible_cpu(cpu) { | |
1036 | struct per_cpu_dm_data *hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1037 | struct net_dm_hw_entries *hw_entries; | |
1038 | ||
1039 | INIT_WORK(&hw_data->dm_alert_work, ops->hw_work_item_func); | |
1040 | timer_setup(&hw_data->send_timer, sched_send_work, 0); | |
1041 | hw_entries = net_dm_hw_reset_per_cpu_data(hw_data); | |
1042 | kfree(hw_entries); | |
1043 | } | |
1044 | ||
8ee2267a IS |
1045 | rc = net_dm_hw_probe_register(ops); |
1046 | if (rc) { | |
1047 | NL_SET_ERR_MSG_MOD(extack, "Failed to connect probe to devlink_trap_probe() tracepoint"); | |
1048 | goto err_module_put; | |
1049 | } | |
1050 | ||
8e94c3bc IS |
1051 | monitor_hw = true; |
1052 | ||
1053 | return 0; | |
8ee2267a IS |
1054 | |
1055 | err_module_put: | |
9398e9c0 IS |
1056 | for_each_possible_cpu(cpu) { |
1057 | struct per_cpu_dm_data *hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1058 | struct sk_buff *skb; | |
1059 | ||
1060 | del_timer_sync(&hw_data->send_timer); | |
1061 | cancel_work_sync(&hw_data->dm_alert_work); | |
1062 | while ((skb = __skb_dequeue(&hw_data->drop_queue))) { | |
1063 | struct devlink_trap_metadata *hw_metadata; | |
1064 | ||
1065 | hw_metadata = NET_DM_SKB_CB(skb)->hw_metadata; | |
1066 | net_dm_hw_metadata_free(hw_metadata); | |
1067 | consume_skb(skb); | |
1068 | } | |
1069 | } | |
8ee2267a IS |
1070 | module_put(THIS_MODULE); |
1071 | return rc; | |
8e94c3bc IS |
1072 | } |
1073 | ||
1074 | static void net_dm_hw_monitor_stop(struct netlink_ext_ack *extack) | |
1075 | { | |
8ee2267a | 1076 | const struct net_dm_alert_ops *ops; |
8e94c3bc IS |
1077 | int cpu; |
1078 | ||
dfa7f709 | 1079 | if (!monitor_hw) { |
8e94c3bc | 1080 | NL_SET_ERR_MSG_MOD(extack, "Hardware monitoring already disabled"); |
dfa7f709 IS |
1081 | return; |
1082 | } | |
8e94c3bc | 1083 | |
8ee2267a IS |
1084 | ops = net_dm_alert_ops_arr[net_dm_alert_mode]; |
1085 | ||
8e94c3bc IS |
1086 | monitor_hw = false; |
1087 | ||
8ee2267a | 1088 | net_dm_hw_probe_unregister(ops); |
8e94c3bc IS |
1089 | |
1090 | for_each_possible_cpu(cpu) { | |
1091 | struct per_cpu_dm_data *hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1092 | struct sk_buff *skb; | |
1093 | ||
1094 | del_timer_sync(&hw_data->send_timer); | |
1095 | cancel_work_sync(&hw_data->dm_alert_work); | |
1096 | while ((skb = __skb_dequeue(&hw_data->drop_queue))) { | |
a848c05f | 1097 | struct devlink_trap_metadata *hw_metadata; |
8e94c3bc IS |
1098 | |
1099 | hw_metadata = NET_DM_SKB_CB(skb)->hw_metadata; | |
1100 | net_dm_hw_metadata_free(hw_metadata); | |
1101 | consume_skb(skb); | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | module_put(THIS_MODULE); | |
1106 | } | |
1107 | ||
7c747838 IS |
1108 | static int net_dm_trace_on_set(struct netlink_ext_ack *extack) |
1109 | { | |
28315f79 | 1110 | const struct net_dm_alert_ops *ops; |
70c69274 | 1111 | int cpu, rc; |
7c747838 | 1112 | |
28315f79 IS |
1113 | ops = net_dm_alert_ops_arr[net_dm_alert_mode]; |
1114 | ||
7c747838 IS |
1115 | if (!try_module_get(THIS_MODULE)) { |
1116 | NL_SET_ERR_MSG_MOD(extack, "Failed to take reference on module"); | |
1117 | return -ENODEV; | |
1118 | } | |
1119 | ||
70c69274 IS |
1120 | for_each_possible_cpu(cpu) { |
1121 | struct per_cpu_dm_data *data = &per_cpu(dm_cpu_data, cpu); | |
44075f56 | 1122 | struct sk_buff *skb; |
70c69274 | 1123 | |
28315f79 | 1124 | INIT_WORK(&data->dm_alert_work, ops->work_item_func); |
70c69274 | 1125 | timer_setup(&data->send_timer, sched_send_work, 0); |
44075f56 IS |
1126 | /* Allocate a new per-CPU skb for the summary alert message and |
1127 | * free the old one which might contain stale data from | |
1128 | * previous tracing. | |
1129 | */ | |
1130 | skb = reset_per_cpu_data(data); | |
1131 | consume_skb(skb); | |
70c69274 IS |
1132 | } |
1133 | ||
28315f79 | 1134 | rc = register_trace_kfree_skb(ops->kfree_skb_probe, NULL); |
7c747838 IS |
1135 | if (rc) { |
1136 | NL_SET_ERR_MSG_MOD(extack, "Failed to connect probe to kfree_skb() tracepoint"); | |
1137 | goto err_module_put; | |
1138 | } | |
1139 | ||
28315f79 | 1140 | rc = register_trace_napi_poll(ops->napi_poll_probe, NULL); |
7c747838 IS |
1141 | if (rc) { |
1142 | NL_SET_ERR_MSG_MOD(extack, "Failed to connect probe to napi_poll() tracepoint"); | |
1143 | goto err_unregister_trace; | |
1144 | } | |
1145 | ||
1146 | return 0; | |
1147 | ||
1148 | err_unregister_trace: | |
28315f79 | 1149 | unregister_trace_kfree_skb(ops->kfree_skb_probe, NULL); |
7c747838 | 1150 | err_module_put: |
9398e9c0 IS |
1151 | for_each_possible_cpu(cpu) { |
1152 | struct per_cpu_dm_data *data = &per_cpu(dm_cpu_data, cpu); | |
1153 | struct sk_buff *skb; | |
1154 | ||
1155 | del_timer_sync(&data->send_timer); | |
1156 | cancel_work_sync(&data->dm_alert_work); | |
1157 | while ((skb = __skb_dequeue(&data->drop_queue))) | |
1158 | consume_skb(skb); | |
1159 | } | |
7c747838 IS |
1160 | module_put(THIS_MODULE); |
1161 | return rc; | |
1162 | } | |
1163 | ||
1164 | static void net_dm_trace_off_set(void) | |
1165 | { | |
1166 | struct dm_hw_stat_delta *new_stat, *temp; | |
28315f79 | 1167 | const struct net_dm_alert_ops *ops; |
70c69274 | 1168 | int cpu; |
7c747838 | 1169 | |
28315f79 IS |
1170 | ops = net_dm_alert_ops_arr[net_dm_alert_mode]; |
1171 | ||
1172 | unregister_trace_napi_poll(ops->napi_poll_probe, NULL); | |
1173 | unregister_trace_kfree_skb(ops->kfree_skb_probe, NULL); | |
7c747838 IS |
1174 | |
1175 | tracepoint_synchronize_unregister(); | |
1176 | ||
70c69274 IS |
1177 | /* Make sure we do not send notifications to user space after request |
1178 | * to stop tracing returns. | |
1179 | */ | |
1180 | for_each_possible_cpu(cpu) { | |
1181 | struct per_cpu_dm_data *data = &per_cpu(dm_cpu_data, cpu); | |
ca30707d | 1182 | struct sk_buff *skb; |
70c69274 IS |
1183 | |
1184 | del_timer_sync(&data->send_timer); | |
1185 | cancel_work_sync(&data->dm_alert_work); | |
ca30707d IS |
1186 | while ((skb = __skb_dequeue(&data->drop_queue))) |
1187 | consume_skb(skb); | |
70c69274 IS |
1188 | } |
1189 | ||
7c747838 IS |
1190 | list_for_each_entry_safe(new_stat, temp, &hw_stats_list, list) { |
1191 | if (new_stat->dev == NULL) { | |
1192 | list_del_rcu(&new_stat->list); | |
1193 | kfree_rcu(new_stat, rcu); | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | module_put(THIS_MODULE); | |
1198 | } | |
1199 | ||
96510096 | 1200 | static int set_all_monitor_traces(int state, struct netlink_ext_ack *extack) |
9a8afc8d NH |
1201 | { |
1202 | int rc = 0; | |
4ea7e386 | 1203 | |
4b706372 | 1204 | if (state == trace_state) { |
96510096 | 1205 | NL_SET_ERR_MSG_MOD(extack, "Trace state already set to requested state"); |
b19d9550 | 1206 | return -EAGAIN; |
4b706372 NH |
1207 | } |
1208 | ||
9a8afc8d NH |
1209 | switch (state) { |
1210 | case TRACE_ON: | |
7c747838 | 1211 | rc = net_dm_trace_on_set(extack); |
9a8afc8d NH |
1212 | break; |
1213 | case TRACE_OFF: | |
7c747838 | 1214 | net_dm_trace_off_set(); |
9a8afc8d NH |
1215 | break; |
1216 | default: | |
1217 | rc = 1; | |
1218 | break; | |
1219 | } | |
1220 | ||
4ea7e386 NH |
1221 | if (!rc) |
1222 | trace_state = state; | |
4b706372 NH |
1223 | else |
1224 | rc = -EINPROGRESS; | |
4ea7e386 | 1225 | |
9a8afc8d NH |
1226 | return rc; |
1227 | } | |
1228 | ||
80cebed8 IS |
1229 | static bool net_dm_is_monitoring(void) |
1230 | { | |
1231 | return trace_state == TRACE_ON || monitor_hw; | |
1232 | } | |
1233 | ||
ca30707d IS |
1234 | static int net_dm_alert_mode_get_from_info(struct genl_info *info, |
1235 | enum net_dm_alert_mode *p_alert_mode) | |
1236 | { | |
1237 | u8 val; | |
1238 | ||
1239 | val = nla_get_u8(info->attrs[NET_DM_ATTR_ALERT_MODE]); | |
1240 | ||
1241 | switch (val) { | |
df561f66 | 1242 | case NET_DM_ALERT_MODE_SUMMARY: |
ca30707d IS |
1243 | case NET_DM_ALERT_MODE_PACKET: |
1244 | *p_alert_mode = val; | |
1245 | break; | |
1246 | default: | |
1247 | return -EINVAL; | |
1248 | } | |
1249 | ||
1250 | return 0; | |
1251 | } | |
1252 | ||
1253 | static int net_dm_alert_mode_set(struct genl_info *info) | |
1254 | { | |
1255 | struct netlink_ext_ack *extack = info->extack; | |
1256 | enum net_dm_alert_mode alert_mode; | |
1257 | int rc; | |
1258 | ||
1259 | if (!info->attrs[NET_DM_ATTR_ALERT_MODE]) | |
1260 | return 0; | |
1261 | ||
1262 | rc = net_dm_alert_mode_get_from_info(info, &alert_mode); | |
1263 | if (rc) { | |
1264 | NL_SET_ERR_MSG_MOD(extack, "Invalid alert mode"); | |
1265 | return -EINVAL; | |
1266 | } | |
1267 | ||
1268 | net_dm_alert_mode = alert_mode; | |
1269 | ||
1270 | return 0; | |
1271 | } | |
1272 | ||
57986617 IS |
1273 | static void net_dm_trunc_len_set(struct genl_info *info) |
1274 | { | |
1275 | if (!info->attrs[NET_DM_ATTR_TRUNC_LEN]) | |
1276 | return; | |
1277 | ||
1278 | net_dm_trunc_len = nla_get_u32(info->attrs[NET_DM_ATTR_TRUNC_LEN]); | |
1279 | } | |
1280 | ||
30328d46 IS |
1281 | static void net_dm_queue_len_set(struct genl_info *info) |
1282 | { | |
1283 | if (!info->attrs[NET_DM_ATTR_QUEUE_LEN]) | |
1284 | return; | |
1285 | ||
1286 | net_dm_queue_len = nla_get_u32(info->attrs[NET_DM_ATTR_QUEUE_LEN]); | |
1287 | } | |
1288 | ||
9a8afc8d NH |
1289 | static int net_dm_cmd_config(struct sk_buff *skb, |
1290 | struct genl_info *info) | |
1291 | { | |
ca30707d IS |
1292 | struct netlink_ext_ack *extack = info->extack; |
1293 | int rc; | |
96510096 | 1294 | |
80cebed8 IS |
1295 | if (net_dm_is_monitoring()) { |
1296 | NL_SET_ERR_MSG_MOD(extack, "Cannot configure drop monitor during monitoring"); | |
ca30707d IS |
1297 | return -EBUSY; |
1298 | } | |
1299 | ||
1300 | rc = net_dm_alert_mode_set(info); | |
1301 | if (rc) | |
1302 | return rc; | |
1303 | ||
57986617 IS |
1304 | net_dm_trunc_len_set(info); |
1305 | ||
30328d46 IS |
1306 | net_dm_queue_len_set(info); |
1307 | ||
ca30707d | 1308 | return 0; |
9a8afc8d NH |
1309 | } |
1310 | ||
8e94c3bc IS |
1311 | static int net_dm_monitor_start(bool set_sw, bool set_hw, |
1312 | struct netlink_ext_ack *extack) | |
1313 | { | |
1314 | bool sw_set = false; | |
1315 | int rc; | |
1316 | ||
1317 | if (set_sw) { | |
1318 | rc = set_all_monitor_traces(TRACE_ON, extack); | |
1319 | if (rc) | |
1320 | return rc; | |
1321 | sw_set = true; | |
1322 | } | |
1323 | ||
1324 | if (set_hw) { | |
1325 | rc = net_dm_hw_monitor_start(extack); | |
1326 | if (rc) | |
1327 | goto err_monitor_hw; | |
1328 | } | |
1329 | ||
1330 | return 0; | |
1331 | ||
1332 | err_monitor_hw: | |
1333 | if (sw_set) | |
1334 | set_all_monitor_traces(TRACE_OFF, extack); | |
1335 | return rc; | |
1336 | } | |
1337 | ||
1338 | static void net_dm_monitor_stop(bool set_sw, bool set_hw, | |
1339 | struct netlink_ext_ack *extack) | |
1340 | { | |
1341 | if (set_hw) | |
1342 | net_dm_hw_monitor_stop(extack); | |
1343 | if (set_sw) | |
1344 | set_all_monitor_traces(TRACE_OFF, extack); | |
1345 | } | |
1346 | ||
9a8afc8d NH |
1347 | static int net_dm_cmd_trace(struct sk_buff *skb, |
1348 | struct genl_info *info) | |
1349 | { | |
8e94c3bc IS |
1350 | bool set_sw = !!info->attrs[NET_DM_ATTR_SW_DROPS]; |
1351 | bool set_hw = !!info->attrs[NET_DM_ATTR_HW_DROPS]; | |
1352 | struct netlink_ext_ack *extack = info->extack; | |
1353 | ||
1354 | /* To maintain backward compatibility, we start / stop monitoring of | |
1355 | * software drops if no flag is specified. | |
1356 | */ | |
1357 | if (!set_sw && !set_hw) | |
1358 | set_sw = true; | |
1359 | ||
9a8afc8d NH |
1360 | switch (info->genlhdr->cmd) { |
1361 | case NET_DM_CMD_START: | |
8e94c3bc | 1362 | return net_dm_monitor_start(set_sw, set_hw, extack); |
9a8afc8d | 1363 | case NET_DM_CMD_STOP: |
8e94c3bc IS |
1364 | net_dm_monitor_stop(set_sw, set_hw, extack); |
1365 | return 0; | |
9a8afc8d NH |
1366 | } |
1367 | ||
2230a7ef | 1368 | return -EOPNOTSUPP; |
9a8afc8d NH |
1369 | } |
1370 | ||
444be061 IS |
1371 | static int net_dm_config_fill(struct sk_buff *msg, struct genl_info *info) |
1372 | { | |
1373 | void *hdr; | |
1374 | ||
1375 | hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, | |
1376 | &net_drop_monitor_family, 0, NET_DM_CMD_CONFIG_NEW); | |
1377 | if (!hdr) | |
1378 | return -EMSGSIZE; | |
1379 | ||
1380 | if (nla_put_u8(msg, NET_DM_ATTR_ALERT_MODE, net_dm_alert_mode)) | |
1381 | goto nla_put_failure; | |
1382 | ||
1383 | if (nla_put_u32(msg, NET_DM_ATTR_TRUNC_LEN, net_dm_trunc_len)) | |
1384 | goto nla_put_failure; | |
1385 | ||
30328d46 IS |
1386 | if (nla_put_u32(msg, NET_DM_ATTR_QUEUE_LEN, net_dm_queue_len)) |
1387 | goto nla_put_failure; | |
1388 | ||
444be061 IS |
1389 | genlmsg_end(msg, hdr); |
1390 | ||
1391 | return 0; | |
1392 | ||
1393 | nla_put_failure: | |
1394 | genlmsg_cancel(msg, hdr); | |
1395 | return -EMSGSIZE; | |
1396 | } | |
1397 | ||
1398 | static int net_dm_cmd_config_get(struct sk_buff *skb, struct genl_info *info) | |
1399 | { | |
1400 | struct sk_buff *msg; | |
1401 | int rc; | |
1402 | ||
1403 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1404 | if (!msg) | |
1405 | return -ENOMEM; | |
1406 | ||
1407 | rc = net_dm_config_fill(msg, info); | |
1408 | if (rc) | |
1409 | goto free_msg; | |
1410 | ||
1411 | return genlmsg_reply(msg, info); | |
1412 | ||
1413 | free_msg: | |
1414 | nlmsg_free(msg); | |
1415 | return rc; | |
1416 | } | |
1417 | ||
e9feb580 IS |
1418 | static void net_dm_stats_read(struct net_dm_stats *stats) |
1419 | { | |
1420 | int cpu; | |
1421 | ||
1422 | memset(stats, 0, sizeof(*stats)); | |
1423 | for_each_possible_cpu(cpu) { | |
1424 | struct per_cpu_dm_data *data = &per_cpu(dm_cpu_data, cpu); | |
1425 | struct net_dm_stats *cpu_stats = &data->stats; | |
1426 | unsigned int start; | |
1427 | u64 dropped; | |
1428 | ||
1429 | do { | |
1430 | start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1431 | dropped = cpu_stats->dropped; | |
1432 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); | |
1433 | ||
1434 | stats->dropped += dropped; | |
1435 | } | |
1436 | } | |
1437 | ||
1438 | static int net_dm_stats_put(struct sk_buff *msg) | |
1439 | { | |
1440 | struct net_dm_stats stats; | |
1441 | struct nlattr *attr; | |
1442 | ||
1443 | net_dm_stats_read(&stats); | |
1444 | ||
1445 | attr = nla_nest_start(msg, NET_DM_ATTR_STATS); | |
1446 | if (!attr) | |
1447 | return -EMSGSIZE; | |
1448 | ||
1449 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_STATS_DROPPED, | |
1450 | stats.dropped, NET_DM_ATTR_PAD)) | |
1451 | goto nla_put_failure; | |
1452 | ||
1453 | nla_nest_end(msg, attr); | |
1454 | ||
1455 | return 0; | |
1456 | ||
1457 | nla_put_failure: | |
1458 | nla_nest_cancel(msg, attr); | |
1459 | return -EMSGSIZE; | |
1460 | } | |
1461 | ||
5e58109b IS |
1462 | static void net_dm_hw_stats_read(struct net_dm_stats *stats) |
1463 | { | |
1464 | int cpu; | |
1465 | ||
1466 | memset(stats, 0, sizeof(*stats)); | |
1467 | for_each_possible_cpu(cpu) { | |
1468 | struct per_cpu_dm_data *hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1469 | struct net_dm_stats *cpu_stats = &hw_data->stats; | |
1470 | unsigned int start; | |
1471 | u64 dropped; | |
1472 | ||
1473 | do { | |
1474 | start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1475 | dropped = cpu_stats->dropped; | |
1476 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); | |
1477 | ||
1478 | stats->dropped += dropped; | |
1479 | } | |
1480 | } | |
1481 | ||
1482 | static int net_dm_hw_stats_put(struct sk_buff *msg) | |
1483 | { | |
1484 | struct net_dm_stats stats; | |
1485 | struct nlattr *attr; | |
1486 | ||
1487 | net_dm_hw_stats_read(&stats); | |
1488 | ||
1489 | attr = nla_nest_start(msg, NET_DM_ATTR_HW_STATS); | |
1490 | if (!attr) | |
1491 | return -EMSGSIZE; | |
1492 | ||
1493 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_STATS_DROPPED, | |
1494 | stats.dropped, NET_DM_ATTR_PAD)) | |
1495 | goto nla_put_failure; | |
1496 | ||
1497 | nla_nest_end(msg, attr); | |
1498 | ||
1499 | return 0; | |
1500 | ||
1501 | nla_put_failure: | |
1502 | nla_nest_cancel(msg, attr); | |
1503 | return -EMSGSIZE; | |
1504 | } | |
1505 | ||
e9feb580 IS |
1506 | static int net_dm_stats_fill(struct sk_buff *msg, struct genl_info *info) |
1507 | { | |
1508 | void *hdr; | |
1509 | int rc; | |
1510 | ||
1511 | hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, | |
1512 | &net_drop_monitor_family, 0, NET_DM_CMD_STATS_NEW); | |
1513 | if (!hdr) | |
1514 | return -EMSGSIZE; | |
1515 | ||
1516 | rc = net_dm_stats_put(msg); | |
1517 | if (rc) | |
1518 | goto nla_put_failure; | |
1519 | ||
5e58109b IS |
1520 | rc = net_dm_hw_stats_put(msg); |
1521 | if (rc) | |
1522 | goto nla_put_failure; | |
1523 | ||
e9feb580 IS |
1524 | genlmsg_end(msg, hdr); |
1525 | ||
1526 | return 0; | |
1527 | ||
1528 | nla_put_failure: | |
1529 | genlmsg_cancel(msg, hdr); | |
1530 | return -EMSGSIZE; | |
1531 | } | |
1532 | ||
1533 | static int net_dm_cmd_stats_get(struct sk_buff *skb, struct genl_info *info) | |
1534 | { | |
1535 | struct sk_buff *msg; | |
1536 | int rc; | |
1537 | ||
1538 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1539 | if (!msg) | |
1540 | return -ENOMEM; | |
1541 | ||
1542 | rc = net_dm_stats_fill(msg, info); | |
1543 | if (rc) | |
1544 | goto free_msg; | |
1545 | ||
1546 | return genlmsg_reply(msg, info); | |
1547 | ||
1548 | free_msg: | |
1549 | nlmsg_free(msg); | |
1550 | return rc; | |
1551 | } | |
1552 | ||
4ea7e386 | 1553 | static int dropmon_net_event(struct notifier_block *ev_block, |
351638e7 | 1554 | unsigned long event, void *ptr) |
4ea7e386 | 1555 | { |
351638e7 | 1556 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4ea7e386 NH |
1557 | struct dm_hw_stat_delta *new_stat = NULL; |
1558 | struct dm_hw_stat_delta *tmp; | |
1559 | ||
1560 | switch (event) { | |
1561 | case NETDEV_REGISTER: | |
1562 | new_stat = kzalloc(sizeof(struct dm_hw_stat_delta), GFP_KERNEL); | |
1563 | ||
1564 | if (!new_stat) | |
1565 | goto out; | |
1566 | ||
1567 | new_stat->dev = dev; | |
5848cc09 | 1568 | new_stat->last_rx = jiffies; |
dbf896b7 | 1569 | mutex_lock(&net_dm_mutex); |
4ea7e386 | 1570 | list_add_rcu(&new_stat->list, &hw_stats_list); |
dbf896b7 | 1571 | mutex_unlock(&net_dm_mutex); |
4ea7e386 NH |
1572 | break; |
1573 | case NETDEV_UNREGISTER: | |
dbf896b7 | 1574 | mutex_lock(&net_dm_mutex); |
4ea7e386 NH |
1575 | list_for_each_entry_safe(new_stat, tmp, &hw_stats_list, list) { |
1576 | if (new_stat->dev == dev) { | |
1577 | new_stat->dev = NULL; | |
1578 | if (trace_state == TRACE_OFF) { | |
1579 | list_del_rcu(&new_stat->list); | |
fa81c0e1 | 1580 | kfree_rcu(new_stat, rcu); |
4ea7e386 NH |
1581 | break; |
1582 | } | |
1583 | } | |
1584 | } | |
dbf896b7 | 1585 | mutex_unlock(&net_dm_mutex); |
4ea7e386 NH |
1586 | break; |
1587 | } | |
1588 | out: | |
1589 | return NOTIFY_DONE; | |
1590 | } | |
9a8afc8d | 1591 | |
ca30707d IS |
1592 | static const struct nla_policy net_dm_nl_policy[NET_DM_ATTR_MAX + 1] = { |
1593 | [NET_DM_ATTR_UNSPEC] = { .strict_start_type = NET_DM_ATTR_UNSPEC + 1 }, | |
1594 | [NET_DM_ATTR_ALERT_MODE] = { .type = NLA_U8 }, | |
57986617 | 1595 | [NET_DM_ATTR_TRUNC_LEN] = { .type = NLA_U32 }, |
30328d46 | 1596 | [NET_DM_ATTR_QUEUE_LEN] = { .type = NLA_U32 }, |
8e94c3bc IS |
1597 | [NET_DM_ATTR_SW_DROPS] = {. type = NLA_FLAG }, |
1598 | [NET_DM_ATTR_HW_DROPS] = {. type = NLA_FLAG }, | |
ca30707d IS |
1599 | }; |
1600 | ||
66a9b928 | 1601 | static const struct genl_small_ops dropmon_ops[] = { |
9a8afc8d NH |
1602 | { |
1603 | .cmd = NET_DM_CMD_CONFIG, | |
ef6243ac | 1604 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
9a8afc8d | 1605 | .doit = net_dm_cmd_config, |
c5ab9b1c | 1606 | .flags = GENL_ADMIN_PERM, |
9a8afc8d NH |
1607 | }, |
1608 | { | |
1609 | .cmd = NET_DM_CMD_START, | |
ef6243ac | 1610 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
9a8afc8d NH |
1611 | .doit = net_dm_cmd_trace, |
1612 | }, | |
1613 | { | |
1614 | .cmd = NET_DM_CMD_STOP, | |
ef6243ac | 1615 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
9a8afc8d NH |
1616 | .doit = net_dm_cmd_trace, |
1617 | }, | |
444be061 IS |
1618 | { |
1619 | .cmd = NET_DM_CMD_CONFIG_GET, | |
1620 | .doit = net_dm_cmd_config_get, | |
1621 | }, | |
e9feb580 IS |
1622 | { |
1623 | .cmd = NET_DM_CMD_STATS_GET, | |
1624 | .doit = net_dm_cmd_stats_get, | |
1625 | }, | |
9a8afc8d NH |
1626 | }; |
1627 | ||
b19d9550 IS |
1628 | static int net_dm_nl_pre_doit(const struct genl_ops *ops, |
1629 | struct sk_buff *skb, struct genl_info *info) | |
1630 | { | |
1631 | mutex_lock(&net_dm_mutex); | |
1632 | ||
1633 | return 0; | |
1634 | } | |
1635 | ||
1636 | static void net_dm_nl_post_doit(const struct genl_ops *ops, | |
1637 | struct sk_buff *skb, struct genl_info *info) | |
1638 | { | |
1639 | mutex_unlock(&net_dm_mutex); | |
1640 | } | |
1641 | ||
56989f6d | 1642 | static struct genl_family net_drop_monitor_family __ro_after_init = { |
489111e5 JB |
1643 | .hdrsize = 0, |
1644 | .name = "NET_DM", | |
1645 | .version = 2, | |
ca30707d IS |
1646 | .maxattr = NET_DM_ATTR_MAX, |
1647 | .policy = net_dm_nl_policy, | |
b19d9550 IS |
1648 | .pre_doit = net_dm_nl_pre_doit, |
1649 | .post_doit = net_dm_nl_post_doit, | |
489111e5 | 1650 | .module = THIS_MODULE, |
66a9b928 JK |
1651 | .small_ops = dropmon_ops, |
1652 | .n_small_ops = ARRAY_SIZE(dropmon_ops), | |
489111e5 JB |
1653 | .mcgrps = dropmon_mcgrps, |
1654 | .n_mcgrps = ARRAY_SIZE(dropmon_mcgrps), | |
1655 | }; | |
1656 | ||
4ea7e386 NH |
1657 | static struct notifier_block dropmon_net_notifier = { |
1658 | .notifier_call = dropmon_net_event | |
1659 | }; | |
1660 | ||
9b63f57d IS |
1661 | static void __net_dm_cpu_data_init(struct per_cpu_dm_data *data) |
1662 | { | |
1663 | spin_lock_init(&data->lock); | |
1664 | skb_queue_head_init(&data->drop_queue); | |
1665 | u64_stats_init(&data->stats.syncp); | |
1666 | } | |
1667 | ||
1668 | static void __net_dm_cpu_data_fini(struct per_cpu_dm_data *data) | |
1669 | { | |
1670 | WARN_ON(!skb_queue_empty(&data->drop_queue)); | |
1671 | } | |
1672 | ||
1673 | static void net_dm_cpu_data_init(int cpu) | |
9a8afc8d | 1674 | { |
9a8afc8d | 1675 | struct per_cpu_dm_data *data; |
9b63f57d IS |
1676 | |
1677 | data = &per_cpu(dm_cpu_data, cpu); | |
1678 | __net_dm_cpu_data_init(data); | |
1679 | } | |
1680 | ||
1681 | static void net_dm_cpu_data_fini(int cpu) | |
1682 | { | |
1683 | struct per_cpu_dm_data *data; | |
1684 | ||
1685 | data = &per_cpu(dm_cpu_data, cpu); | |
1686 | /* At this point, we should have exclusive access | |
1687 | * to this struct and can free the skb inside it. | |
1688 | */ | |
1689 | consume_skb(data->skb); | |
1690 | __net_dm_cpu_data_fini(data); | |
1691 | } | |
1692 | ||
cac1174f IS |
1693 | static void net_dm_hw_cpu_data_init(int cpu) |
1694 | { | |
1695 | struct per_cpu_dm_data *hw_data; | |
1696 | ||
1697 | hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1698 | __net_dm_cpu_data_init(hw_data); | |
1699 | } | |
1700 | ||
1701 | static void net_dm_hw_cpu_data_fini(int cpu) | |
1702 | { | |
1703 | struct per_cpu_dm_data *hw_data; | |
1704 | ||
1705 | hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
d40e1deb | 1706 | kfree(hw_data->hw_entries); |
cac1174f IS |
1707 | __net_dm_cpu_data_fini(hw_data); |
1708 | } | |
1709 | ||
9b63f57d IS |
1710 | static int __init init_net_drop_monitor(void) |
1711 | { | |
a256be70 CG |
1712 | int cpu, rc; |
1713 | ||
e005d193 | 1714 | pr_info("Initializing network drop monitor service\n"); |
9a8afc8d NH |
1715 | |
1716 | if (sizeof(void *) > 8) { | |
e005d193 | 1717 | pr_err("Unable to store program counters on this arch, Drop monitor failed\n"); |
9a8afc8d NH |
1718 | return -ENOSPC; |
1719 | } | |
1720 | ||
489111e5 | 1721 | rc = genl_register_family(&net_drop_monitor_family); |
a256be70 | 1722 | if (rc) { |
e005d193 | 1723 | pr_err("Could not create drop monitor netlink family\n"); |
a256be70 | 1724 | return rc; |
9a8afc8d | 1725 | } |
2a94fe48 | 1726 | WARN_ON(net_drop_monitor_family.mcgrp_offset != NET_DM_GRP_ALERT); |
e5dcecba | 1727 | |
4ea7e386 NH |
1728 | rc = register_netdevice_notifier(&dropmon_net_notifier); |
1729 | if (rc < 0) { | |
e005d193 | 1730 | pr_crit("Failed to register netdevice notifier\n"); |
4ea7e386 NH |
1731 | goto out_unreg; |
1732 | } | |
1733 | ||
9a8afc8d NH |
1734 | rc = 0; |
1735 | ||
cac1174f | 1736 | for_each_possible_cpu(cpu) { |
9b63f57d | 1737 | net_dm_cpu_data_init(cpu); |
cac1174f IS |
1738 | net_dm_hw_cpu_data_init(cpu); |
1739 | } | |
4ea7e386 | 1740 | |
9a8afc8d NH |
1741 | goto out; |
1742 | ||
1743 | out_unreg: | |
1744 | genl_unregister_family(&net_drop_monitor_family); | |
1745 | out: | |
1746 | return rc; | |
1747 | } | |
1748 | ||
cad456d5 NH |
1749 | static void exit_net_drop_monitor(void) |
1750 | { | |
cad456d5 NH |
1751 | int cpu; |
1752 | ||
1753 | BUG_ON(unregister_netdevice_notifier(&dropmon_net_notifier)); | |
1754 | ||
1755 | /* | |
1756 | * Because of the module_get/put we do in the trace state change path | |
a835f903 | 1757 | * we are guaranteed not to have any current users when we get here |
cad456d5 NH |
1758 | */ |
1759 | ||
cac1174f IS |
1760 | for_each_possible_cpu(cpu) { |
1761 | net_dm_hw_cpu_data_fini(cpu); | |
9b63f57d | 1762 | net_dm_cpu_data_fini(cpu); |
cac1174f | 1763 | } |
cad456d5 NH |
1764 | |
1765 | BUG_ON(genl_unregister_family(&net_drop_monitor_family)); | |
1766 | } | |
1767 | ||
1768 | module_init(init_net_drop_monitor); | |
1769 | module_exit(exit_net_drop_monitor); | |
1770 | ||
1771 | MODULE_LICENSE("GPL v2"); | |
1772 | MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver.com>"); | |
3fdcbd45 | 1773 | MODULE_ALIAS_GENL_FAMILY("NET_DM"); |
67c20de3 | 1774 | MODULE_DESCRIPTION("Monitoring code for network dropped packet alerts"); |