1 // SPDX-License-Identifier: GPL-2.0-only
3 * Monitoring code for network dropped packet alerts
5 * Copyright (C) 2009 Neil Horman <nhorman@tuxdriver.com>
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
27 #include <linux/slab.h>
28 #include <linux/module.h>
29 #include <net/drop_monitor.h>
30 #include <net/genetlink.h>
31 #include <net/netevent.h>
32 #include <net/flow_offload.h>
34 #include <trace/events/skb.h>
35 #include <trace/events/napi.h>
37 #include <asm/unaligned.h>
43 * Globals, our netlink socket pointer
44 * and the work handle that will send up
47 static int trace_state
= TRACE_OFF
;
48 static bool monitor_hw
;
52 * An overall lock guarding every operation coming from userspace.
53 * It also guards the global 'hw_stats_list' list.
55 static DEFINE_MUTEX(net_dm_mutex
);
59 struct u64_stats_sync syncp
;
62 #define NET_DM_MAX_HW_TRAP_NAME_LEN 40
64 struct net_dm_hw_entry
{
65 char trap_name
[NET_DM_MAX_HW_TRAP_NAME_LEN
];
69 struct net_dm_hw_entries
{
71 struct net_dm_hw_entry entries
[];
74 struct per_cpu_dm_data
{
75 spinlock_t lock
; /* Protects 'skb', 'hw_entries' and
80 struct net_dm_hw_entries
*hw_entries
;
82 struct sk_buff_head drop_queue
;
83 struct work_struct dm_alert_work
;
84 struct timer_list send_timer
;
85 struct net_dm_stats stats
;
88 struct dm_hw_stat_delta
{
89 struct net_device
*dev
;
90 unsigned long last_rx
;
91 struct list_head list
;
93 unsigned long last_drop_val
;
96 static struct genl_family net_drop_monitor_family
;
98 static DEFINE_PER_CPU(struct per_cpu_dm_data
, dm_cpu_data
);
99 static DEFINE_PER_CPU(struct per_cpu_dm_data
, dm_hw_cpu_data
);
101 static int dm_hit_limit
= 64;
102 static int dm_delay
= 1;
103 static unsigned long dm_hw_check_delta
= 2*HZ
;
104 static LIST_HEAD(hw_stats_list
);
106 static enum net_dm_alert_mode net_dm_alert_mode
= NET_DM_ALERT_MODE_SUMMARY
;
107 static u32 net_dm_trunc_len
;
108 static u32 net_dm_queue_len
= 1000;
110 struct net_dm_alert_ops
{
111 void (*kfree_skb_probe
)(void *ignore
, struct sk_buff
*skb
,
113 void (*napi_poll_probe
)(void *ignore
, struct napi_struct
*napi
,
114 int work
, int budget
);
115 void (*work_item_func
)(struct work_struct
*work
);
116 void (*hw_work_item_func
)(struct work_struct
*work
);
117 void (*hw_probe
)(struct sk_buff
*skb
,
118 const struct net_dm_hw_metadata
*hw_metadata
);
121 struct net_dm_skb_cb
{
123 struct net_dm_hw_metadata
*hw_metadata
;
128 #define NET_DM_SKB_CB(__skb) ((struct net_dm_skb_cb *)&((__skb)->cb[0]))
130 static struct sk_buff
*reset_per_cpu_data(struct per_cpu_dm_data
*data
)
133 struct net_dm_alert_msg
*msg
;
139 al
= sizeof(struct net_dm_alert_msg
);
140 al
+= dm_hit_limit
* sizeof(struct net_dm_drop_point
);
141 al
+= sizeof(struct nlattr
);
143 skb
= genlmsg_new(al
, GFP_KERNEL
);
148 msg_header
= genlmsg_put(skb
, 0, 0, &net_drop_monitor_family
,
149 0, NET_DM_CMD_ALERT
);
155 nla
= nla_reserve(skb
, NLA_UNSPEC
,
156 sizeof(struct net_dm_alert_msg
));
167 mod_timer(&data
->send_timer
, jiffies
+ HZ
/ 10);
169 spin_lock_irqsave(&data
->lock
, flags
);
170 swap(data
->skb
, skb
);
171 spin_unlock_irqrestore(&data
->lock
, flags
);
174 struct nlmsghdr
*nlh
= (struct nlmsghdr
*)skb
->data
;
175 struct genlmsghdr
*gnlh
= (struct genlmsghdr
*)nlmsg_data(nlh
);
177 genlmsg_end(skb
, genlmsg_data(gnlh
));
183 static const struct genl_multicast_group dropmon_mcgrps
[] = {
184 { .name
= "events", },
187 static void send_dm_alert(struct work_struct
*work
)
190 struct per_cpu_dm_data
*data
;
192 data
= container_of(work
, struct per_cpu_dm_data
, dm_alert_work
);
194 skb
= reset_per_cpu_data(data
);
197 genlmsg_multicast(&net_drop_monitor_family
, skb
, 0,
202 * This is the timer function to delay the sending of an alert
203 * in the event that more drops will arrive during the
206 static void sched_send_work(struct timer_list
*t
)
208 struct per_cpu_dm_data
*data
= from_timer(data
, t
, send_timer
);
210 schedule_work(&data
->dm_alert_work
);
213 static void trace_drop_common(struct sk_buff
*skb
, void *location
)
215 struct net_dm_alert_msg
*msg
;
216 struct nlmsghdr
*nlh
;
219 struct sk_buff
*dskb
;
220 struct per_cpu_dm_data
*data
;
223 local_irq_save(flags
);
224 data
= this_cpu_ptr(&dm_cpu_data
);
225 spin_lock(&data
->lock
);
231 nlh
= (struct nlmsghdr
*)dskb
->data
;
232 nla
= genlmsg_data(nlmsg_data(nlh
));
234 for (i
= 0; i
< msg
->entries
; i
++) {
235 if (!memcmp(&location
, msg
->points
[i
].pc
, sizeof(void *))) {
236 msg
->points
[i
].count
++;
240 if (msg
->entries
== dm_hit_limit
)
243 * We need to create a new entry
245 __nla_reserve_nohdr(dskb
, sizeof(struct net_dm_drop_point
));
246 nla
->nla_len
+= NLA_ALIGN(sizeof(struct net_dm_drop_point
));
247 memcpy(msg
->points
[msg
->entries
].pc
, &location
, sizeof(void *));
248 msg
->points
[msg
->entries
].count
= 1;
251 if (!timer_pending(&data
->send_timer
)) {
252 data
->send_timer
.expires
= jiffies
+ dm_delay
* HZ
;
253 add_timer(&data
->send_timer
);
257 spin_unlock_irqrestore(&data
->lock
, flags
);
260 static void trace_kfree_skb_hit(void *ignore
, struct sk_buff
*skb
, void *location
)
262 trace_drop_common(skb
, location
);
265 static void trace_napi_poll_hit(void *ignore
, struct napi_struct
*napi
,
266 int work
, int budget
)
268 struct dm_hw_stat_delta
*new_stat
;
271 * Don't check napi structures with no associated device
277 list_for_each_entry_rcu(new_stat
, &hw_stats_list
, list
) {
279 * only add a note to our monitor buffer if:
280 * 1) this is the dev we received on
281 * 2) its after the last_rx delta
282 * 3) our rx_dropped count has gone up
284 if ((new_stat
->dev
== napi
->dev
) &&
285 (time_after(jiffies
, new_stat
->last_rx
+ dm_hw_check_delta
)) &&
286 (napi
->dev
->stats
.rx_dropped
!= new_stat
->last_drop_val
)) {
287 trace_drop_common(NULL
, NULL
);
288 new_stat
->last_drop_val
= napi
->dev
->stats
.rx_dropped
;
289 new_stat
->last_rx
= jiffies
;
296 static struct net_dm_hw_entries
*
297 net_dm_hw_reset_per_cpu_data(struct per_cpu_dm_data
*hw_data
)
299 struct net_dm_hw_entries
*hw_entries
;
302 hw_entries
= kzalloc(struct_size(hw_entries
, entries
, dm_hit_limit
),
305 /* If the memory allocation failed, we try to perform another
306 * allocation in 1/10 second. Otherwise, the probe function
307 * will constantly bail out.
309 mod_timer(&hw_data
->send_timer
, jiffies
+ HZ
/ 10);
312 spin_lock_irqsave(&hw_data
->lock
, flags
);
313 swap(hw_data
->hw_entries
, hw_entries
);
314 spin_unlock_irqrestore(&hw_data
->lock
, flags
);
319 static int net_dm_hw_entry_put(struct sk_buff
*msg
,
320 const struct net_dm_hw_entry
*hw_entry
)
324 attr
= nla_nest_start(msg
, NET_DM_ATTR_HW_ENTRY
);
328 if (nla_put_string(msg
, NET_DM_ATTR_HW_TRAP_NAME
, hw_entry
->trap_name
))
329 goto nla_put_failure
;
331 if (nla_put_u32(msg
, NET_DM_ATTR_HW_TRAP_COUNT
, hw_entry
->count
))
332 goto nla_put_failure
;
334 nla_nest_end(msg
, attr
);
339 nla_nest_cancel(msg
, attr
);
343 static int net_dm_hw_entries_put(struct sk_buff
*msg
,
344 const struct net_dm_hw_entries
*hw_entries
)
349 attr
= nla_nest_start(msg
, NET_DM_ATTR_HW_ENTRIES
);
353 for (i
= 0; i
< hw_entries
->num_entries
; i
++) {
356 rc
= net_dm_hw_entry_put(msg
, &hw_entries
->entries
[i
]);
358 goto nla_put_failure
;
361 nla_nest_end(msg
, attr
);
366 nla_nest_cancel(msg
, attr
);
371 net_dm_hw_summary_report_fill(struct sk_buff
*msg
,
372 const struct net_dm_hw_entries
*hw_entries
)
374 struct net_dm_alert_msg anc_hdr
= { 0 };
378 hdr
= genlmsg_put(msg
, 0, 0, &net_drop_monitor_family
, 0,
383 /* We need to put the ancillary header in order not to break user
386 if (nla_put(msg
, NLA_UNSPEC
, sizeof(anc_hdr
), &anc_hdr
))
387 goto nla_put_failure
;
389 rc
= net_dm_hw_entries_put(msg
, hw_entries
);
391 goto nla_put_failure
;
393 genlmsg_end(msg
, hdr
);
398 genlmsg_cancel(msg
, hdr
);
402 static void net_dm_hw_summary_work(struct work_struct
*work
)
404 struct net_dm_hw_entries
*hw_entries
;
405 struct per_cpu_dm_data
*hw_data
;
409 hw_data
= container_of(work
, struct per_cpu_dm_data
, dm_alert_work
);
411 hw_entries
= net_dm_hw_reset_per_cpu_data(hw_data
);
415 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
419 rc
= net_dm_hw_summary_report_fill(msg
, hw_entries
);
425 genlmsg_multicast(&net_drop_monitor_family
, msg
, 0, 0, GFP_KERNEL
);
432 net_dm_hw_summary_probe(struct sk_buff
*skb
,
433 const struct net_dm_hw_metadata
*hw_metadata
)
435 struct net_dm_hw_entries
*hw_entries
;
436 struct net_dm_hw_entry
*hw_entry
;
437 struct per_cpu_dm_data
*hw_data
;
441 hw_data
= this_cpu_ptr(&dm_hw_cpu_data
);
442 spin_lock_irqsave(&hw_data
->lock
, flags
);
443 hw_entries
= hw_data
->hw_entries
;
448 for (i
= 0; i
< hw_entries
->num_entries
; i
++) {
449 hw_entry
= &hw_entries
->entries
[i
];
450 if (!strncmp(hw_entry
->trap_name
, hw_metadata
->trap_name
,
451 NET_DM_MAX_HW_TRAP_NAME_LEN
- 1)) {
456 if (WARN_ON_ONCE(hw_entries
->num_entries
== dm_hit_limit
))
459 hw_entry
= &hw_entries
->entries
[hw_entries
->num_entries
];
460 strlcpy(hw_entry
->trap_name
, hw_metadata
->trap_name
,
461 NET_DM_MAX_HW_TRAP_NAME_LEN
- 1);
463 hw_entries
->num_entries
++;
465 if (!timer_pending(&hw_data
->send_timer
)) {
466 hw_data
->send_timer
.expires
= jiffies
+ dm_delay
* HZ
;
467 add_timer(&hw_data
->send_timer
);
471 spin_unlock_irqrestore(&hw_data
->lock
, flags
);
474 static const struct net_dm_alert_ops net_dm_alert_summary_ops
= {
475 .kfree_skb_probe
= trace_kfree_skb_hit
,
476 .napi_poll_probe
= trace_napi_poll_hit
,
477 .work_item_func
= send_dm_alert
,
478 .hw_work_item_func
= net_dm_hw_summary_work
,
479 .hw_probe
= net_dm_hw_summary_probe
,
482 static void net_dm_packet_trace_kfree_skb_hit(void *ignore
,
486 ktime_t tstamp
= ktime_get_real();
487 struct per_cpu_dm_data
*data
;
488 struct sk_buff
*nskb
;
491 if (!skb_mac_header_was_set(skb
))
494 nskb
= skb_clone(skb
, GFP_ATOMIC
);
498 NET_DM_SKB_CB(nskb
)->pc
= location
;
499 /* Override the timestamp because we care about the time when the
500 * packet was dropped.
502 nskb
->tstamp
= tstamp
;
504 data
= this_cpu_ptr(&dm_cpu_data
);
506 spin_lock_irqsave(&data
->drop_queue
.lock
, flags
);
507 if (skb_queue_len(&data
->drop_queue
) < net_dm_queue_len
)
508 __skb_queue_tail(&data
->drop_queue
, nskb
);
511 spin_unlock_irqrestore(&data
->drop_queue
.lock
, flags
);
513 schedule_work(&data
->dm_alert_work
);
518 spin_unlock_irqrestore(&data
->drop_queue
.lock
, flags
);
519 u64_stats_update_begin(&data
->stats
.syncp
);
520 data
->stats
.dropped
++;
521 u64_stats_update_end(&data
->stats
.syncp
);
525 static void net_dm_packet_trace_napi_poll_hit(void *ignore
,
526 struct napi_struct
*napi
,
527 int work
, int budget
)
531 static size_t net_dm_in_port_size(void)
533 /* NET_DM_ATTR_IN_PORT nest */
534 return nla_total_size(0) +
535 /* NET_DM_ATTR_PORT_NETDEV_IFINDEX */
536 nla_total_size(sizeof(u32
)) +
537 /* NET_DM_ATTR_PORT_NETDEV_NAME */
538 nla_total_size(IFNAMSIZ
+ 1);
541 #define NET_DM_MAX_SYMBOL_LEN 40
543 static size_t net_dm_packet_report_size(size_t payload_len
)
547 size
= nlmsg_msg_size(GENL_HDRLEN
+ net_drop_monitor_family
.hdrsize
);
549 return NLMSG_ALIGN(size
) +
550 /* NET_DM_ATTR_ORIGIN */
551 nla_total_size(sizeof(u16
)) +
553 nla_total_size(sizeof(u64
)) +
554 /* NET_DM_ATTR_SYMBOL */
555 nla_total_size(NET_DM_MAX_SYMBOL_LEN
+ 1) +
556 /* NET_DM_ATTR_IN_PORT */
557 net_dm_in_port_size() +
558 /* NET_DM_ATTR_TIMESTAMP */
559 nla_total_size(sizeof(u64
)) +
560 /* NET_DM_ATTR_ORIG_LEN */
561 nla_total_size(sizeof(u32
)) +
562 /* NET_DM_ATTR_PROTO */
563 nla_total_size(sizeof(u16
)) +
564 /* NET_DM_ATTR_PAYLOAD */
565 nla_total_size(payload_len
);
568 static int net_dm_packet_report_in_port_put(struct sk_buff
*msg
, int ifindex
,
573 attr
= nla_nest_start(msg
, NET_DM_ATTR_IN_PORT
);
578 nla_put_u32(msg
, NET_DM_ATTR_PORT_NETDEV_IFINDEX
, ifindex
))
579 goto nla_put_failure
;
581 if (name
&& nla_put_string(msg
, NET_DM_ATTR_PORT_NETDEV_NAME
, name
))
582 goto nla_put_failure
;
584 nla_nest_end(msg
, attr
);
589 nla_nest_cancel(msg
, attr
);
593 static int net_dm_packet_report_fill(struct sk_buff
*msg
, struct sk_buff
*skb
,
596 u64 pc
= (u64
)(uintptr_t) NET_DM_SKB_CB(skb
)->pc
;
597 char buf
[NET_DM_MAX_SYMBOL_LEN
];
602 hdr
= genlmsg_put(msg
, 0, 0, &net_drop_monitor_family
, 0,
603 NET_DM_CMD_PACKET_ALERT
);
607 if (nla_put_u16(msg
, NET_DM_ATTR_ORIGIN
, NET_DM_ORIGIN_SW
))
608 goto nla_put_failure
;
610 if (nla_put_u64_64bit(msg
, NET_DM_ATTR_PC
, pc
, NET_DM_ATTR_PAD
))
611 goto nla_put_failure
;
613 snprintf(buf
, sizeof(buf
), "%pS", NET_DM_SKB_CB(skb
)->pc
);
614 if (nla_put_string(msg
, NET_DM_ATTR_SYMBOL
, buf
))
615 goto nla_put_failure
;
617 rc
= net_dm_packet_report_in_port_put(msg
, skb
->skb_iif
, NULL
);
619 goto nla_put_failure
;
621 if (nla_put_u64_64bit(msg
, NET_DM_ATTR_TIMESTAMP
,
622 ktime_to_ns(skb
->tstamp
), NET_DM_ATTR_PAD
))
623 goto nla_put_failure
;
625 if (nla_put_u32(msg
, NET_DM_ATTR_ORIG_LEN
, skb
->len
))
626 goto nla_put_failure
;
631 if (nla_put_u16(msg
, NET_DM_ATTR_PROTO
, be16_to_cpu(skb
->protocol
)))
632 goto nla_put_failure
;
634 attr
= skb_put(msg
, nla_total_size(payload_len
));
635 attr
->nla_type
= NET_DM_ATTR_PAYLOAD
;
636 attr
->nla_len
= nla_attr_size(payload_len
);
637 if (skb_copy_bits(skb
, 0, nla_data(attr
), payload_len
))
638 goto nla_put_failure
;
641 genlmsg_end(msg
, hdr
);
646 genlmsg_cancel(msg
, hdr
);
650 #define NET_DM_MAX_PACKET_SIZE (0xffff - NLA_HDRLEN - NLA_ALIGNTO)
652 static void net_dm_packet_report(struct sk_buff
*skb
)
658 /* Make sure we start copying the packet from the MAC header */
659 if (skb
->data
> skb_mac_header(skb
))
660 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
662 skb_pull(skb
, skb_mac_header(skb
) - skb
->data
);
664 /* Ensure packet fits inside a single netlink attribute */
665 payload_len
= min_t(size_t, skb
->len
, NET_DM_MAX_PACKET_SIZE
);
666 if (net_dm_trunc_len
)
667 payload_len
= min_t(size_t, net_dm_trunc_len
, payload_len
);
669 msg
= nlmsg_new(net_dm_packet_report_size(payload_len
), GFP_KERNEL
);
673 rc
= net_dm_packet_report_fill(msg
, skb
, payload_len
);
679 genlmsg_multicast(&net_drop_monitor_family
, msg
, 0, 0, GFP_KERNEL
);
685 static void net_dm_packet_work(struct work_struct
*work
)
687 struct per_cpu_dm_data
*data
;
688 struct sk_buff_head list
;
692 data
= container_of(work
, struct per_cpu_dm_data
, dm_alert_work
);
694 __skb_queue_head_init(&list
);
696 spin_lock_irqsave(&data
->drop_queue
.lock
, flags
);
697 skb_queue_splice_tail_init(&data
->drop_queue
, &list
);
698 spin_unlock_irqrestore(&data
->drop_queue
.lock
, flags
);
700 while ((skb
= __skb_dequeue(&list
)))
701 net_dm_packet_report(skb
);
705 net_dm_flow_action_cookie_size(const struct net_dm_hw_metadata
*hw_metadata
)
707 return hw_metadata
->fa_cookie
?
708 nla_total_size(hw_metadata
->fa_cookie
->cookie_len
) : 0;
712 net_dm_hw_packet_report_size(size_t payload_len
,
713 const struct net_dm_hw_metadata
*hw_metadata
)
717 size
= nlmsg_msg_size(GENL_HDRLEN
+ net_drop_monitor_family
.hdrsize
);
719 return NLMSG_ALIGN(size
) +
720 /* NET_DM_ATTR_ORIGIN */
721 nla_total_size(sizeof(u16
)) +
722 /* NET_DM_ATTR_HW_TRAP_GROUP_NAME */
723 nla_total_size(strlen(hw_metadata
->trap_group_name
) + 1) +
724 /* NET_DM_ATTR_HW_TRAP_NAME */
725 nla_total_size(strlen(hw_metadata
->trap_name
) + 1) +
726 /* NET_DM_ATTR_IN_PORT */
727 net_dm_in_port_size() +
728 /* NET_DM_ATTR_FLOW_ACTION_COOKIE */
729 net_dm_flow_action_cookie_size(hw_metadata
) +
730 /* NET_DM_ATTR_TIMESTAMP */
731 nla_total_size(sizeof(u64
)) +
732 /* NET_DM_ATTR_ORIG_LEN */
733 nla_total_size(sizeof(u32
)) +
734 /* NET_DM_ATTR_PROTO */
735 nla_total_size(sizeof(u16
)) +
736 /* NET_DM_ATTR_PAYLOAD */
737 nla_total_size(payload_len
);
740 static int net_dm_hw_packet_report_fill(struct sk_buff
*msg
,
741 struct sk_buff
*skb
, size_t payload_len
)
743 struct net_dm_hw_metadata
*hw_metadata
;
747 hw_metadata
= NET_DM_SKB_CB(skb
)->hw_metadata
;
749 hdr
= genlmsg_put(msg
, 0, 0, &net_drop_monitor_family
, 0,
750 NET_DM_CMD_PACKET_ALERT
);
754 if (nla_put_u16(msg
, NET_DM_ATTR_ORIGIN
, NET_DM_ORIGIN_HW
))
755 goto nla_put_failure
;
757 if (nla_put_string(msg
, NET_DM_ATTR_HW_TRAP_GROUP_NAME
,
758 hw_metadata
->trap_group_name
))
759 goto nla_put_failure
;
761 if (nla_put_string(msg
, NET_DM_ATTR_HW_TRAP_NAME
,
762 hw_metadata
->trap_name
))
763 goto nla_put_failure
;
765 if (hw_metadata
->input_dev
) {
766 struct net_device
*dev
= hw_metadata
->input_dev
;
769 rc
= net_dm_packet_report_in_port_put(msg
, dev
->ifindex
,
772 goto nla_put_failure
;
775 if (hw_metadata
->fa_cookie
&&
776 nla_put(msg
, NET_DM_ATTR_FLOW_ACTION_COOKIE
,
777 hw_metadata
->fa_cookie
->cookie_len
,
778 hw_metadata
->fa_cookie
->cookie
))
779 goto nla_put_failure
;
781 if (nla_put_u64_64bit(msg
, NET_DM_ATTR_TIMESTAMP
,
782 ktime_to_ns(skb
->tstamp
), NET_DM_ATTR_PAD
))
783 goto nla_put_failure
;
785 if (nla_put_u32(msg
, NET_DM_ATTR_ORIG_LEN
, skb
->len
))
786 goto nla_put_failure
;
791 if (nla_put_u16(msg
, NET_DM_ATTR_PROTO
, be16_to_cpu(skb
->protocol
)))
792 goto nla_put_failure
;
794 attr
= skb_put(msg
, nla_total_size(payload_len
));
795 attr
->nla_type
= NET_DM_ATTR_PAYLOAD
;
796 attr
->nla_len
= nla_attr_size(payload_len
);
797 if (skb_copy_bits(skb
, 0, nla_data(attr
), payload_len
))
798 goto nla_put_failure
;
801 genlmsg_end(msg
, hdr
);
806 genlmsg_cancel(msg
, hdr
);
810 static struct net_dm_hw_metadata
*
811 net_dm_hw_metadata_clone(const struct net_dm_hw_metadata
*hw_metadata
)
813 const struct flow_action_cookie
*fa_cookie
;
814 struct net_dm_hw_metadata
*n_hw_metadata
;
815 const char *trap_group_name
;
816 const char *trap_name
;
818 n_hw_metadata
= kzalloc(sizeof(*hw_metadata
), GFP_ATOMIC
);
822 trap_group_name
= kstrdup(hw_metadata
->trap_group_name
, GFP_ATOMIC
);
823 if (!trap_group_name
)
824 goto free_hw_metadata
;
825 n_hw_metadata
->trap_group_name
= trap_group_name
;
827 trap_name
= kstrdup(hw_metadata
->trap_name
, GFP_ATOMIC
);
829 goto free_trap_group
;
830 n_hw_metadata
->trap_name
= trap_name
;
832 if (hw_metadata
->fa_cookie
) {
833 size_t cookie_size
= sizeof(*fa_cookie
) +
834 hw_metadata
->fa_cookie
->cookie_len
;
836 fa_cookie
= kmemdup(hw_metadata
->fa_cookie
, cookie_size
,
840 n_hw_metadata
->fa_cookie
= fa_cookie
;
843 n_hw_metadata
->input_dev
= hw_metadata
->input_dev
;
844 if (n_hw_metadata
->input_dev
)
845 dev_hold(n_hw_metadata
->input_dev
);
847 return n_hw_metadata
;
852 kfree(trap_group_name
);
854 kfree(n_hw_metadata
);
859 net_dm_hw_metadata_free(const struct net_dm_hw_metadata
*hw_metadata
)
861 if (hw_metadata
->input_dev
)
862 dev_put(hw_metadata
->input_dev
);
863 kfree(hw_metadata
->fa_cookie
);
864 kfree(hw_metadata
->trap_name
);
865 kfree(hw_metadata
->trap_group_name
);
869 static void net_dm_hw_packet_report(struct sk_buff
*skb
)
871 struct net_dm_hw_metadata
*hw_metadata
;
876 if (skb
->data
> skb_mac_header(skb
))
877 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
879 skb_pull(skb
, skb_mac_header(skb
) - skb
->data
);
881 payload_len
= min_t(size_t, skb
->len
, NET_DM_MAX_PACKET_SIZE
);
882 if (net_dm_trunc_len
)
883 payload_len
= min_t(size_t, net_dm_trunc_len
, payload_len
);
885 hw_metadata
= NET_DM_SKB_CB(skb
)->hw_metadata
;
886 msg
= nlmsg_new(net_dm_hw_packet_report_size(payload_len
, hw_metadata
),
891 rc
= net_dm_hw_packet_report_fill(msg
, skb
, payload_len
);
897 genlmsg_multicast(&net_drop_monitor_family
, msg
, 0, 0, GFP_KERNEL
);
900 net_dm_hw_metadata_free(NET_DM_SKB_CB(skb
)->hw_metadata
);
904 static void net_dm_hw_packet_work(struct work_struct
*work
)
906 struct per_cpu_dm_data
*hw_data
;
907 struct sk_buff_head list
;
911 hw_data
= container_of(work
, struct per_cpu_dm_data
, dm_alert_work
);
913 __skb_queue_head_init(&list
);
915 spin_lock_irqsave(&hw_data
->drop_queue
.lock
, flags
);
916 skb_queue_splice_tail_init(&hw_data
->drop_queue
, &list
);
917 spin_unlock_irqrestore(&hw_data
->drop_queue
.lock
, flags
);
919 while ((skb
= __skb_dequeue(&list
)))
920 net_dm_hw_packet_report(skb
);
924 net_dm_hw_packet_probe(struct sk_buff
*skb
,
925 const struct net_dm_hw_metadata
*hw_metadata
)
927 struct net_dm_hw_metadata
*n_hw_metadata
;
928 ktime_t tstamp
= ktime_get_real();
929 struct per_cpu_dm_data
*hw_data
;
930 struct sk_buff
*nskb
;
933 if (!skb_mac_header_was_set(skb
))
936 nskb
= skb_clone(skb
, GFP_ATOMIC
);
940 n_hw_metadata
= net_dm_hw_metadata_clone(hw_metadata
);
944 NET_DM_SKB_CB(nskb
)->hw_metadata
= n_hw_metadata
;
945 nskb
->tstamp
= tstamp
;
947 hw_data
= this_cpu_ptr(&dm_hw_cpu_data
);
949 spin_lock_irqsave(&hw_data
->drop_queue
.lock
, flags
);
950 if (skb_queue_len(&hw_data
->drop_queue
) < net_dm_queue_len
)
951 __skb_queue_tail(&hw_data
->drop_queue
, nskb
);
954 spin_unlock_irqrestore(&hw_data
->drop_queue
.lock
, flags
);
956 schedule_work(&hw_data
->dm_alert_work
);
961 spin_unlock_irqrestore(&hw_data
->drop_queue
.lock
, flags
);
962 u64_stats_update_begin(&hw_data
->stats
.syncp
);
963 hw_data
->stats
.dropped
++;
964 u64_stats_update_end(&hw_data
->stats
.syncp
);
965 net_dm_hw_metadata_free(n_hw_metadata
);
970 static const struct net_dm_alert_ops net_dm_alert_packet_ops
= {
971 .kfree_skb_probe
= net_dm_packet_trace_kfree_skb_hit
,
972 .napi_poll_probe
= net_dm_packet_trace_napi_poll_hit
,
973 .work_item_func
= net_dm_packet_work
,
974 .hw_work_item_func
= net_dm_hw_packet_work
,
975 .hw_probe
= net_dm_hw_packet_probe
,
978 static const struct net_dm_alert_ops
*net_dm_alert_ops_arr
[] = {
979 [NET_DM_ALERT_MODE_SUMMARY
] = &net_dm_alert_summary_ops
,
980 [NET_DM_ALERT_MODE_PACKET
] = &net_dm_alert_packet_ops
,
983 void net_dm_hw_report(struct sk_buff
*skb
,
984 const struct net_dm_hw_metadata
*hw_metadata
)
991 net_dm_alert_ops_arr
[net_dm_alert_mode
]->hw_probe(skb
, hw_metadata
);
996 EXPORT_SYMBOL_GPL(net_dm_hw_report
);
998 static int net_dm_hw_monitor_start(struct netlink_ext_ack
*extack
)
1000 const struct net_dm_alert_ops
*ops
;
1004 NL_SET_ERR_MSG_MOD(extack
, "Hardware monitoring already enabled");
1008 ops
= net_dm_alert_ops_arr
[net_dm_alert_mode
];
1010 if (!try_module_get(THIS_MODULE
)) {
1011 NL_SET_ERR_MSG_MOD(extack
, "Failed to take reference on module");
1015 for_each_possible_cpu(cpu
) {
1016 struct per_cpu_dm_data
*hw_data
= &per_cpu(dm_hw_cpu_data
, cpu
);
1017 struct net_dm_hw_entries
*hw_entries
;
1019 INIT_WORK(&hw_data
->dm_alert_work
, ops
->hw_work_item_func
);
1020 timer_setup(&hw_data
->send_timer
, sched_send_work
, 0);
1021 hw_entries
= net_dm_hw_reset_per_cpu_data(hw_data
);
1030 static void net_dm_hw_monitor_stop(struct netlink_ext_ack
*extack
)
1035 NL_SET_ERR_MSG_MOD(extack
, "Hardware monitoring already disabled");
1041 /* After this call returns we are guaranteed that no CPU is processing
1042 * any hardware drops.
1046 for_each_possible_cpu(cpu
) {
1047 struct per_cpu_dm_data
*hw_data
= &per_cpu(dm_hw_cpu_data
, cpu
);
1048 struct sk_buff
*skb
;
1050 del_timer_sync(&hw_data
->send_timer
);
1051 cancel_work_sync(&hw_data
->dm_alert_work
);
1052 while ((skb
= __skb_dequeue(&hw_data
->drop_queue
))) {
1053 struct net_dm_hw_metadata
*hw_metadata
;
1055 hw_metadata
= NET_DM_SKB_CB(skb
)->hw_metadata
;
1056 net_dm_hw_metadata_free(hw_metadata
);
1061 module_put(THIS_MODULE
);
1064 static int net_dm_trace_on_set(struct netlink_ext_ack
*extack
)
1066 const struct net_dm_alert_ops
*ops
;
1069 ops
= net_dm_alert_ops_arr
[net_dm_alert_mode
];
1071 if (!try_module_get(THIS_MODULE
)) {
1072 NL_SET_ERR_MSG_MOD(extack
, "Failed to take reference on module");
1076 for_each_possible_cpu(cpu
) {
1077 struct per_cpu_dm_data
*data
= &per_cpu(dm_cpu_data
, cpu
);
1078 struct sk_buff
*skb
;
1080 INIT_WORK(&data
->dm_alert_work
, ops
->work_item_func
);
1081 timer_setup(&data
->send_timer
, sched_send_work
, 0);
1082 /* Allocate a new per-CPU skb for the summary alert message and
1083 * free the old one which might contain stale data from
1086 skb
= reset_per_cpu_data(data
);
1090 rc
= register_trace_kfree_skb(ops
->kfree_skb_probe
, NULL
);
1092 NL_SET_ERR_MSG_MOD(extack
, "Failed to connect probe to kfree_skb() tracepoint");
1093 goto err_module_put
;
1096 rc
= register_trace_napi_poll(ops
->napi_poll_probe
, NULL
);
1098 NL_SET_ERR_MSG_MOD(extack
, "Failed to connect probe to napi_poll() tracepoint");
1099 goto err_unregister_trace
;
1104 err_unregister_trace
:
1105 unregister_trace_kfree_skb(ops
->kfree_skb_probe
, NULL
);
1107 module_put(THIS_MODULE
);
1111 static void net_dm_trace_off_set(void)
1113 struct dm_hw_stat_delta
*new_stat
, *temp
;
1114 const struct net_dm_alert_ops
*ops
;
1117 ops
= net_dm_alert_ops_arr
[net_dm_alert_mode
];
1119 unregister_trace_napi_poll(ops
->napi_poll_probe
, NULL
);
1120 unregister_trace_kfree_skb(ops
->kfree_skb_probe
, NULL
);
1122 tracepoint_synchronize_unregister();
1124 /* Make sure we do not send notifications to user space after request
1125 * to stop tracing returns.
1127 for_each_possible_cpu(cpu
) {
1128 struct per_cpu_dm_data
*data
= &per_cpu(dm_cpu_data
, cpu
);
1129 struct sk_buff
*skb
;
1131 del_timer_sync(&data
->send_timer
);
1132 cancel_work_sync(&data
->dm_alert_work
);
1133 while ((skb
= __skb_dequeue(&data
->drop_queue
)))
1137 list_for_each_entry_safe(new_stat
, temp
, &hw_stats_list
, list
) {
1138 if (new_stat
->dev
== NULL
) {
1139 list_del_rcu(&new_stat
->list
);
1140 kfree_rcu(new_stat
, rcu
);
1144 module_put(THIS_MODULE
);
1147 static int set_all_monitor_traces(int state
, struct netlink_ext_ack
*extack
)
1151 if (state
== trace_state
) {
1152 NL_SET_ERR_MSG_MOD(extack
, "Trace state already set to requested state");
1158 rc
= net_dm_trace_on_set(extack
);
1161 net_dm_trace_off_set();
1169 trace_state
= state
;
1176 static bool net_dm_is_monitoring(void)
1178 return trace_state
== TRACE_ON
|| monitor_hw
;
1181 static int net_dm_alert_mode_get_from_info(struct genl_info
*info
,
1182 enum net_dm_alert_mode
*p_alert_mode
)
1186 val
= nla_get_u8(info
->attrs
[NET_DM_ATTR_ALERT_MODE
]);
1189 case NET_DM_ALERT_MODE_SUMMARY
: /* fall-through */
1190 case NET_DM_ALERT_MODE_PACKET
:
1191 *p_alert_mode
= val
;
1200 static int net_dm_alert_mode_set(struct genl_info
*info
)
1202 struct netlink_ext_ack
*extack
= info
->extack
;
1203 enum net_dm_alert_mode alert_mode
;
1206 if (!info
->attrs
[NET_DM_ATTR_ALERT_MODE
])
1209 rc
= net_dm_alert_mode_get_from_info(info
, &alert_mode
);
1211 NL_SET_ERR_MSG_MOD(extack
, "Invalid alert mode");
1215 net_dm_alert_mode
= alert_mode
;
1220 static void net_dm_trunc_len_set(struct genl_info
*info
)
1222 if (!info
->attrs
[NET_DM_ATTR_TRUNC_LEN
])
1225 net_dm_trunc_len
= nla_get_u32(info
->attrs
[NET_DM_ATTR_TRUNC_LEN
]);
1228 static void net_dm_queue_len_set(struct genl_info
*info
)
1230 if (!info
->attrs
[NET_DM_ATTR_QUEUE_LEN
])
1233 net_dm_queue_len
= nla_get_u32(info
->attrs
[NET_DM_ATTR_QUEUE_LEN
]);
1236 static int net_dm_cmd_config(struct sk_buff
*skb
,
1237 struct genl_info
*info
)
1239 struct netlink_ext_ack
*extack
= info
->extack
;
1242 if (net_dm_is_monitoring()) {
1243 NL_SET_ERR_MSG_MOD(extack
, "Cannot configure drop monitor during monitoring");
1247 rc
= net_dm_alert_mode_set(info
);
1251 net_dm_trunc_len_set(info
);
1253 net_dm_queue_len_set(info
);
1258 static int net_dm_monitor_start(bool set_sw
, bool set_hw
,
1259 struct netlink_ext_ack
*extack
)
1261 bool sw_set
= false;
1265 rc
= set_all_monitor_traces(TRACE_ON
, extack
);
1272 rc
= net_dm_hw_monitor_start(extack
);
1274 goto err_monitor_hw
;
1281 set_all_monitor_traces(TRACE_OFF
, extack
);
1285 static void net_dm_monitor_stop(bool set_sw
, bool set_hw
,
1286 struct netlink_ext_ack
*extack
)
1289 net_dm_hw_monitor_stop(extack
);
1291 set_all_monitor_traces(TRACE_OFF
, extack
);
1294 static int net_dm_cmd_trace(struct sk_buff
*skb
,
1295 struct genl_info
*info
)
1297 bool set_sw
= !!info
->attrs
[NET_DM_ATTR_SW_DROPS
];
1298 bool set_hw
= !!info
->attrs
[NET_DM_ATTR_HW_DROPS
];
1299 struct netlink_ext_ack
*extack
= info
->extack
;
1301 /* To maintain backward compatibility, we start / stop monitoring of
1302 * software drops if no flag is specified.
1304 if (!set_sw
&& !set_hw
)
1307 switch (info
->genlhdr
->cmd
) {
1308 case NET_DM_CMD_START
:
1309 return net_dm_monitor_start(set_sw
, set_hw
, extack
);
1310 case NET_DM_CMD_STOP
:
1311 net_dm_monitor_stop(set_sw
, set_hw
, extack
);
1318 static int net_dm_config_fill(struct sk_buff
*msg
, struct genl_info
*info
)
1322 hdr
= genlmsg_put(msg
, info
->snd_portid
, info
->snd_seq
,
1323 &net_drop_monitor_family
, 0, NET_DM_CMD_CONFIG_NEW
);
1327 if (nla_put_u8(msg
, NET_DM_ATTR_ALERT_MODE
, net_dm_alert_mode
))
1328 goto nla_put_failure
;
1330 if (nla_put_u32(msg
, NET_DM_ATTR_TRUNC_LEN
, net_dm_trunc_len
))
1331 goto nla_put_failure
;
1333 if (nla_put_u32(msg
, NET_DM_ATTR_QUEUE_LEN
, net_dm_queue_len
))
1334 goto nla_put_failure
;
1336 genlmsg_end(msg
, hdr
);
1341 genlmsg_cancel(msg
, hdr
);
1345 static int net_dm_cmd_config_get(struct sk_buff
*skb
, struct genl_info
*info
)
1347 struct sk_buff
*msg
;
1350 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
1354 rc
= net_dm_config_fill(msg
, info
);
1358 return genlmsg_reply(msg
, info
);
1365 static void net_dm_stats_read(struct net_dm_stats
*stats
)
1369 memset(stats
, 0, sizeof(*stats
));
1370 for_each_possible_cpu(cpu
) {
1371 struct per_cpu_dm_data
*data
= &per_cpu(dm_cpu_data
, cpu
);
1372 struct net_dm_stats
*cpu_stats
= &data
->stats
;
1377 start
= u64_stats_fetch_begin_irq(&cpu_stats
->syncp
);
1378 dropped
= cpu_stats
->dropped
;
1379 } while (u64_stats_fetch_retry_irq(&cpu_stats
->syncp
, start
));
1381 stats
->dropped
+= dropped
;
1385 static int net_dm_stats_put(struct sk_buff
*msg
)
1387 struct net_dm_stats stats
;
1388 struct nlattr
*attr
;
1390 net_dm_stats_read(&stats
);
1392 attr
= nla_nest_start(msg
, NET_DM_ATTR_STATS
);
1396 if (nla_put_u64_64bit(msg
, NET_DM_ATTR_STATS_DROPPED
,
1397 stats
.dropped
, NET_DM_ATTR_PAD
))
1398 goto nla_put_failure
;
1400 nla_nest_end(msg
, attr
);
1405 nla_nest_cancel(msg
, attr
);
1409 static void net_dm_hw_stats_read(struct net_dm_stats
*stats
)
1413 memset(stats
, 0, sizeof(*stats
));
1414 for_each_possible_cpu(cpu
) {
1415 struct per_cpu_dm_data
*hw_data
= &per_cpu(dm_hw_cpu_data
, cpu
);
1416 struct net_dm_stats
*cpu_stats
= &hw_data
->stats
;
1421 start
= u64_stats_fetch_begin_irq(&cpu_stats
->syncp
);
1422 dropped
= cpu_stats
->dropped
;
1423 } while (u64_stats_fetch_retry_irq(&cpu_stats
->syncp
, start
));
1425 stats
->dropped
+= dropped
;
1429 static int net_dm_hw_stats_put(struct sk_buff
*msg
)
1431 struct net_dm_stats stats
;
1432 struct nlattr
*attr
;
1434 net_dm_hw_stats_read(&stats
);
1436 attr
= nla_nest_start(msg
, NET_DM_ATTR_HW_STATS
);
1440 if (nla_put_u64_64bit(msg
, NET_DM_ATTR_STATS_DROPPED
,
1441 stats
.dropped
, NET_DM_ATTR_PAD
))
1442 goto nla_put_failure
;
1444 nla_nest_end(msg
, attr
);
1449 nla_nest_cancel(msg
, attr
);
1453 static int net_dm_stats_fill(struct sk_buff
*msg
, struct genl_info
*info
)
1458 hdr
= genlmsg_put(msg
, info
->snd_portid
, info
->snd_seq
,
1459 &net_drop_monitor_family
, 0, NET_DM_CMD_STATS_NEW
);
1463 rc
= net_dm_stats_put(msg
);
1465 goto nla_put_failure
;
1467 rc
= net_dm_hw_stats_put(msg
);
1469 goto nla_put_failure
;
1471 genlmsg_end(msg
, hdr
);
1476 genlmsg_cancel(msg
, hdr
);
1480 static int net_dm_cmd_stats_get(struct sk_buff
*skb
, struct genl_info
*info
)
1482 struct sk_buff
*msg
;
1485 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
1489 rc
= net_dm_stats_fill(msg
, info
);
1493 return genlmsg_reply(msg
, info
);
1500 static int dropmon_net_event(struct notifier_block
*ev_block
,
1501 unsigned long event
, void *ptr
)
1503 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1504 struct dm_hw_stat_delta
*new_stat
= NULL
;
1505 struct dm_hw_stat_delta
*tmp
;
1508 case NETDEV_REGISTER
:
1509 new_stat
= kzalloc(sizeof(struct dm_hw_stat_delta
), GFP_KERNEL
);
1514 new_stat
->dev
= dev
;
1515 new_stat
->last_rx
= jiffies
;
1516 mutex_lock(&net_dm_mutex
);
1517 list_add_rcu(&new_stat
->list
, &hw_stats_list
);
1518 mutex_unlock(&net_dm_mutex
);
1520 case NETDEV_UNREGISTER
:
1521 mutex_lock(&net_dm_mutex
);
1522 list_for_each_entry_safe(new_stat
, tmp
, &hw_stats_list
, list
) {
1523 if (new_stat
->dev
== dev
) {
1524 new_stat
->dev
= NULL
;
1525 if (trace_state
== TRACE_OFF
) {
1526 list_del_rcu(&new_stat
->list
);
1527 kfree_rcu(new_stat
, rcu
);
1532 mutex_unlock(&net_dm_mutex
);
1539 static const struct nla_policy net_dm_nl_policy
[NET_DM_ATTR_MAX
+ 1] = {
1540 [NET_DM_ATTR_UNSPEC
] = { .strict_start_type
= NET_DM_ATTR_UNSPEC
+ 1 },
1541 [NET_DM_ATTR_ALERT_MODE
] = { .type
= NLA_U8
},
1542 [NET_DM_ATTR_TRUNC_LEN
] = { .type
= NLA_U32
},
1543 [NET_DM_ATTR_QUEUE_LEN
] = { .type
= NLA_U32
},
1544 [NET_DM_ATTR_SW_DROPS
] = {. type
= NLA_FLAG
},
1545 [NET_DM_ATTR_HW_DROPS
] = {. type
= NLA_FLAG
},
1548 static const struct genl_ops dropmon_ops
[] = {
1550 .cmd
= NET_DM_CMD_CONFIG
,
1551 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
1552 .doit
= net_dm_cmd_config
,
1553 .flags
= GENL_ADMIN_PERM
,
1556 .cmd
= NET_DM_CMD_START
,
1557 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
1558 .doit
= net_dm_cmd_trace
,
1561 .cmd
= NET_DM_CMD_STOP
,
1562 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
1563 .doit
= net_dm_cmd_trace
,
1566 .cmd
= NET_DM_CMD_CONFIG_GET
,
1567 .doit
= net_dm_cmd_config_get
,
1570 .cmd
= NET_DM_CMD_STATS_GET
,
1571 .doit
= net_dm_cmd_stats_get
,
1575 static int net_dm_nl_pre_doit(const struct genl_ops
*ops
,
1576 struct sk_buff
*skb
, struct genl_info
*info
)
1578 mutex_lock(&net_dm_mutex
);
1583 static void net_dm_nl_post_doit(const struct genl_ops
*ops
,
1584 struct sk_buff
*skb
, struct genl_info
*info
)
1586 mutex_unlock(&net_dm_mutex
);
1589 static struct genl_family net_drop_monitor_family __ro_after_init
= {
1593 .maxattr
= NET_DM_ATTR_MAX
,
1594 .policy
= net_dm_nl_policy
,
1595 .pre_doit
= net_dm_nl_pre_doit
,
1596 .post_doit
= net_dm_nl_post_doit
,
1597 .module
= THIS_MODULE
,
1599 .n_ops
= ARRAY_SIZE(dropmon_ops
),
1600 .mcgrps
= dropmon_mcgrps
,
1601 .n_mcgrps
= ARRAY_SIZE(dropmon_mcgrps
),
1604 static struct notifier_block dropmon_net_notifier
= {
1605 .notifier_call
= dropmon_net_event
1608 static void __net_dm_cpu_data_init(struct per_cpu_dm_data
*data
)
1610 spin_lock_init(&data
->lock
);
1611 skb_queue_head_init(&data
->drop_queue
);
1612 u64_stats_init(&data
->stats
.syncp
);
1615 static void __net_dm_cpu_data_fini(struct per_cpu_dm_data
*data
)
1617 WARN_ON(!skb_queue_empty(&data
->drop_queue
));
1620 static void net_dm_cpu_data_init(int cpu
)
1622 struct per_cpu_dm_data
*data
;
1624 data
= &per_cpu(dm_cpu_data
, cpu
);
1625 __net_dm_cpu_data_init(data
);
1628 static void net_dm_cpu_data_fini(int cpu
)
1630 struct per_cpu_dm_data
*data
;
1632 data
= &per_cpu(dm_cpu_data
, cpu
);
1633 /* At this point, we should have exclusive access
1634 * to this struct and can free the skb inside it.
1636 consume_skb(data
->skb
);
1637 __net_dm_cpu_data_fini(data
);
1640 static void net_dm_hw_cpu_data_init(int cpu
)
1642 struct per_cpu_dm_data
*hw_data
;
1644 hw_data
= &per_cpu(dm_hw_cpu_data
, cpu
);
1645 __net_dm_cpu_data_init(hw_data
);
1648 static void net_dm_hw_cpu_data_fini(int cpu
)
1650 struct per_cpu_dm_data
*hw_data
;
1652 hw_data
= &per_cpu(dm_hw_cpu_data
, cpu
);
1653 kfree(hw_data
->hw_entries
);
1654 __net_dm_cpu_data_fini(hw_data
);
1657 static int __init
init_net_drop_monitor(void)
1661 pr_info("Initializing network drop monitor service\n");
1663 if (sizeof(void *) > 8) {
1664 pr_err("Unable to store program counters on this arch, Drop monitor failed\n");
1668 rc
= genl_register_family(&net_drop_monitor_family
);
1670 pr_err("Could not create drop monitor netlink family\n");
1673 WARN_ON(net_drop_monitor_family
.mcgrp_offset
!= NET_DM_GRP_ALERT
);
1675 rc
= register_netdevice_notifier(&dropmon_net_notifier
);
1677 pr_crit("Failed to register netdevice notifier\n");
1683 for_each_possible_cpu(cpu
) {
1684 net_dm_cpu_data_init(cpu
);
1685 net_dm_hw_cpu_data_init(cpu
);
1691 genl_unregister_family(&net_drop_monitor_family
);
1696 static void exit_net_drop_monitor(void)
1700 BUG_ON(unregister_netdevice_notifier(&dropmon_net_notifier
));
1703 * Because of the module_get/put we do in the trace state change path
1704 * we are guarnateed not to have any current users when we get here
1707 for_each_possible_cpu(cpu
) {
1708 net_dm_hw_cpu_data_fini(cpu
);
1709 net_dm_cpu_data_fini(cpu
);
1712 BUG_ON(genl_unregister_family(&net_drop_monitor_family
));
1715 module_init(init_net_drop_monitor
);
1716 module_exit(exit_net_drop_monitor
);
1718 MODULE_LICENSE("GPL v2");
1719 MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver.com>");
1720 MODULE_ALIAS_GENL_FAMILY("NET_DM");