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 net_dm_drop_point
*point
;
217 struct nlmsghdr
*nlh
;
220 struct sk_buff
*dskb
;
221 struct per_cpu_dm_data
*data
;
224 local_irq_save(flags
);
225 data
= this_cpu_ptr(&dm_cpu_data
);
226 spin_lock(&data
->lock
);
232 nlh
= (struct nlmsghdr
*)dskb
->data
;
233 nla
= genlmsg_data(nlmsg_data(nlh
));
236 for (i
= 0; i
< msg
->entries
; i
++) {
237 if (!memcmp(&location
, &point
->pc
, sizeof(void *))) {
243 if (msg
->entries
== dm_hit_limit
)
246 * We need to create a new entry
248 __nla_reserve_nohdr(dskb
, sizeof(struct net_dm_drop_point
));
249 nla
->nla_len
+= NLA_ALIGN(sizeof(struct net_dm_drop_point
));
250 memcpy(point
->pc
, &location
, sizeof(void *));
254 if (!timer_pending(&data
->send_timer
)) {
255 data
->send_timer
.expires
= jiffies
+ dm_delay
* HZ
;
256 add_timer(&data
->send_timer
);
260 spin_unlock_irqrestore(&data
->lock
, flags
);
263 static void trace_kfree_skb_hit(void *ignore
, struct sk_buff
*skb
, void *location
)
265 trace_drop_common(skb
, location
);
268 static void trace_napi_poll_hit(void *ignore
, struct napi_struct
*napi
,
269 int work
, int budget
)
271 struct dm_hw_stat_delta
*new_stat
;
274 * Don't check napi structures with no associated device
280 list_for_each_entry_rcu(new_stat
, &hw_stats_list
, list
) {
282 * only add a note to our monitor buffer if:
283 * 1) this is the dev we received on
284 * 2) its after the last_rx delta
285 * 3) our rx_dropped count has gone up
287 if ((new_stat
->dev
== napi
->dev
) &&
288 (time_after(jiffies
, new_stat
->last_rx
+ dm_hw_check_delta
)) &&
289 (napi
->dev
->stats
.rx_dropped
!= new_stat
->last_drop_val
)) {
290 trace_drop_common(NULL
, NULL
);
291 new_stat
->last_drop_val
= napi
->dev
->stats
.rx_dropped
;
292 new_stat
->last_rx
= jiffies
;
299 static struct net_dm_hw_entries
*
300 net_dm_hw_reset_per_cpu_data(struct per_cpu_dm_data
*hw_data
)
302 struct net_dm_hw_entries
*hw_entries
;
305 hw_entries
= kzalloc(struct_size(hw_entries
, entries
, dm_hit_limit
),
308 /* If the memory allocation failed, we try to perform another
309 * allocation in 1/10 second. Otherwise, the probe function
310 * will constantly bail out.
312 mod_timer(&hw_data
->send_timer
, jiffies
+ HZ
/ 10);
315 spin_lock_irqsave(&hw_data
->lock
, flags
);
316 swap(hw_data
->hw_entries
, hw_entries
);
317 spin_unlock_irqrestore(&hw_data
->lock
, flags
);
322 static int net_dm_hw_entry_put(struct sk_buff
*msg
,
323 const struct net_dm_hw_entry
*hw_entry
)
327 attr
= nla_nest_start(msg
, NET_DM_ATTR_HW_ENTRY
);
331 if (nla_put_string(msg
, NET_DM_ATTR_HW_TRAP_NAME
, hw_entry
->trap_name
))
332 goto nla_put_failure
;
334 if (nla_put_u32(msg
, NET_DM_ATTR_HW_TRAP_COUNT
, hw_entry
->count
))
335 goto nla_put_failure
;
337 nla_nest_end(msg
, attr
);
342 nla_nest_cancel(msg
, attr
);
346 static int net_dm_hw_entries_put(struct sk_buff
*msg
,
347 const struct net_dm_hw_entries
*hw_entries
)
352 attr
= nla_nest_start(msg
, NET_DM_ATTR_HW_ENTRIES
);
356 for (i
= 0; i
< hw_entries
->num_entries
; i
++) {
359 rc
= net_dm_hw_entry_put(msg
, &hw_entries
->entries
[i
]);
361 goto nla_put_failure
;
364 nla_nest_end(msg
, attr
);
369 nla_nest_cancel(msg
, attr
);
374 net_dm_hw_summary_report_fill(struct sk_buff
*msg
,
375 const struct net_dm_hw_entries
*hw_entries
)
377 struct net_dm_alert_msg anc_hdr
= { 0 };
381 hdr
= genlmsg_put(msg
, 0, 0, &net_drop_monitor_family
, 0,
386 /* We need to put the ancillary header in order not to break user
389 if (nla_put(msg
, NLA_UNSPEC
, sizeof(anc_hdr
), &anc_hdr
))
390 goto nla_put_failure
;
392 rc
= net_dm_hw_entries_put(msg
, hw_entries
);
394 goto nla_put_failure
;
396 genlmsg_end(msg
, hdr
);
401 genlmsg_cancel(msg
, hdr
);
405 static void net_dm_hw_summary_work(struct work_struct
*work
)
407 struct net_dm_hw_entries
*hw_entries
;
408 struct per_cpu_dm_data
*hw_data
;
412 hw_data
= container_of(work
, struct per_cpu_dm_data
, dm_alert_work
);
414 hw_entries
= net_dm_hw_reset_per_cpu_data(hw_data
);
418 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
422 rc
= net_dm_hw_summary_report_fill(msg
, hw_entries
);
428 genlmsg_multicast(&net_drop_monitor_family
, msg
, 0, 0, GFP_KERNEL
);
435 net_dm_hw_summary_probe(struct sk_buff
*skb
,
436 const struct net_dm_hw_metadata
*hw_metadata
)
438 struct net_dm_hw_entries
*hw_entries
;
439 struct net_dm_hw_entry
*hw_entry
;
440 struct per_cpu_dm_data
*hw_data
;
444 hw_data
= this_cpu_ptr(&dm_hw_cpu_data
);
445 spin_lock_irqsave(&hw_data
->lock
, flags
);
446 hw_entries
= hw_data
->hw_entries
;
451 for (i
= 0; i
< hw_entries
->num_entries
; i
++) {
452 hw_entry
= &hw_entries
->entries
[i
];
453 if (!strncmp(hw_entry
->trap_name
, hw_metadata
->trap_name
,
454 NET_DM_MAX_HW_TRAP_NAME_LEN
- 1)) {
459 if (WARN_ON_ONCE(hw_entries
->num_entries
== dm_hit_limit
))
462 hw_entry
= &hw_entries
->entries
[hw_entries
->num_entries
];
463 strlcpy(hw_entry
->trap_name
, hw_metadata
->trap_name
,
464 NET_DM_MAX_HW_TRAP_NAME_LEN
- 1);
466 hw_entries
->num_entries
++;
468 if (!timer_pending(&hw_data
->send_timer
)) {
469 hw_data
->send_timer
.expires
= jiffies
+ dm_delay
* HZ
;
470 add_timer(&hw_data
->send_timer
);
474 spin_unlock_irqrestore(&hw_data
->lock
, flags
);
477 static const struct net_dm_alert_ops net_dm_alert_summary_ops
= {
478 .kfree_skb_probe
= trace_kfree_skb_hit
,
479 .napi_poll_probe
= trace_napi_poll_hit
,
480 .work_item_func
= send_dm_alert
,
481 .hw_work_item_func
= net_dm_hw_summary_work
,
482 .hw_probe
= net_dm_hw_summary_probe
,
485 static void net_dm_packet_trace_kfree_skb_hit(void *ignore
,
489 ktime_t tstamp
= ktime_get_real();
490 struct per_cpu_dm_data
*data
;
491 struct sk_buff
*nskb
;
494 if (!skb_mac_header_was_set(skb
))
497 nskb
= skb_clone(skb
, GFP_ATOMIC
);
501 NET_DM_SKB_CB(nskb
)->pc
= location
;
502 /* Override the timestamp because we care about the time when the
503 * packet was dropped.
505 nskb
->tstamp
= tstamp
;
507 data
= this_cpu_ptr(&dm_cpu_data
);
509 spin_lock_irqsave(&data
->drop_queue
.lock
, flags
);
510 if (skb_queue_len(&data
->drop_queue
) < net_dm_queue_len
)
511 __skb_queue_tail(&data
->drop_queue
, nskb
);
514 spin_unlock_irqrestore(&data
->drop_queue
.lock
, flags
);
516 schedule_work(&data
->dm_alert_work
);
521 spin_unlock_irqrestore(&data
->drop_queue
.lock
, flags
);
522 u64_stats_update_begin(&data
->stats
.syncp
);
523 data
->stats
.dropped
++;
524 u64_stats_update_end(&data
->stats
.syncp
);
528 static void net_dm_packet_trace_napi_poll_hit(void *ignore
,
529 struct napi_struct
*napi
,
530 int work
, int budget
)
534 static size_t net_dm_in_port_size(void)
536 /* NET_DM_ATTR_IN_PORT nest */
537 return nla_total_size(0) +
538 /* NET_DM_ATTR_PORT_NETDEV_IFINDEX */
539 nla_total_size(sizeof(u32
)) +
540 /* NET_DM_ATTR_PORT_NETDEV_NAME */
541 nla_total_size(IFNAMSIZ
+ 1);
544 #define NET_DM_MAX_SYMBOL_LEN 40
546 static size_t net_dm_packet_report_size(size_t payload_len
)
550 size
= nlmsg_msg_size(GENL_HDRLEN
+ net_drop_monitor_family
.hdrsize
);
552 return NLMSG_ALIGN(size
) +
553 /* NET_DM_ATTR_ORIGIN */
554 nla_total_size(sizeof(u16
)) +
556 nla_total_size(sizeof(u64
)) +
557 /* NET_DM_ATTR_SYMBOL */
558 nla_total_size(NET_DM_MAX_SYMBOL_LEN
+ 1) +
559 /* NET_DM_ATTR_IN_PORT */
560 net_dm_in_port_size() +
561 /* NET_DM_ATTR_TIMESTAMP */
562 nla_total_size(sizeof(u64
)) +
563 /* NET_DM_ATTR_ORIG_LEN */
564 nla_total_size(sizeof(u32
)) +
565 /* NET_DM_ATTR_PROTO */
566 nla_total_size(sizeof(u16
)) +
567 /* NET_DM_ATTR_PAYLOAD */
568 nla_total_size(payload_len
);
571 static int net_dm_packet_report_in_port_put(struct sk_buff
*msg
, int ifindex
,
576 attr
= nla_nest_start(msg
, NET_DM_ATTR_IN_PORT
);
581 nla_put_u32(msg
, NET_DM_ATTR_PORT_NETDEV_IFINDEX
, ifindex
))
582 goto nla_put_failure
;
584 if (name
&& nla_put_string(msg
, NET_DM_ATTR_PORT_NETDEV_NAME
, name
))
585 goto nla_put_failure
;
587 nla_nest_end(msg
, attr
);
592 nla_nest_cancel(msg
, attr
);
596 static int net_dm_packet_report_fill(struct sk_buff
*msg
, struct sk_buff
*skb
,
599 u64 pc
= (u64
)(uintptr_t) NET_DM_SKB_CB(skb
)->pc
;
600 char buf
[NET_DM_MAX_SYMBOL_LEN
];
605 hdr
= genlmsg_put(msg
, 0, 0, &net_drop_monitor_family
, 0,
606 NET_DM_CMD_PACKET_ALERT
);
610 if (nla_put_u16(msg
, NET_DM_ATTR_ORIGIN
, NET_DM_ORIGIN_SW
))
611 goto nla_put_failure
;
613 if (nla_put_u64_64bit(msg
, NET_DM_ATTR_PC
, pc
, NET_DM_ATTR_PAD
))
614 goto nla_put_failure
;
616 snprintf(buf
, sizeof(buf
), "%pS", NET_DM_SKB_CB(skb
)->pc
);
617 if (nla_put_string(msg
, NET_DM_ATTR_SYMBOL
, buf
))
618 goto nla_put_failure
;
620 rc
= net_dm_packet_report_in_port_put(msg
, skb
->skb_iif
, NULL
);
622 goto nla_put_failure
;
624 if (nla_put_u64_64bit(msg
, NET_DM_ATTR_TIMESTAMP
,
625 ktime_to_ns(skb
->tstamp
), NET_DM_ATTR_PAD
))
626 goto nla_put_failure
;
628 if (nla_put_u32(msg
, NET_DM_ATTR_ORIG_LEN
, skb
->len
))
629 goto nla_put_failure
;
634 if (nla_put_u16(msg
, NET_DM_ATTR_PROTO
, be16_to_cpu(skb
->protocol
)))
635 goto nla_put_failure
;
637 attr
= skb_put(msg
, nla_total_size(payload_len
));
638 attr
->nla_type
= NET_DM_ATTR_PAYLOAD
;
639 attr
->nla_len
= nla_attr_size(payload_len
);
640 if (skb_copy_bits(skb
, 0, nla_data(attr
), payload_len
))
641 goto nla_put_failure
;
644 genlmsg_end(msg
, hdr
);
649 genlmsg_cancel(msg
, hdr
);
653 #define NET_DM_MAX_PACKET_SIZE (0xffff - NLA_HDRLEN - NLA_ALIGNTO)
655 static void net_dm_packet_report(struct sk_buff
*skb
)
661 /* Make sure we start copying the packet from the MAC header */
662 if (skb
->data
> skb_mac_header(skb
))
663 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
665 skb_pull(skb
, skb_mac_header(skb
) - skb
->data
);
667 /* Ensure packet fits inside a single netlink attribute */
668 payload_len
= min_t(size_t, skb
->len
, NET_DM_MAX_PACKET_SIZE
);
669 if (net_dm_trunc_len
)
670 payload_len
= min_t(size_t, net_dm_trunc_len
, payload_len
);
672 msg
= nlmsg_new(net_dm_packet_report_size(payload_len
), GFP_KERNEL
);
676 rc
= net_dm_packet_report_fill(msg
, skb
, payload_len
);
682 genlmsg_multicast(&net_drop_monitor_family
, msg
, 0, 0, GFP_KERNEL
);
688 static void net_dm_packet_work(struct work_struct
*work
)
690 struct per_cpu_dm_data
*data
;
691 struct sk_buff_head list
;
695 data
= container_of(work
, struct per_cpu_dm_data
, dm_alert_work
);
697 __skb_queue_head_init(&list
);
699 spin_lock_irqsave(&data
->drop_queue
.lock
, flags
);
700 skb_queue_splice_tail_init(&data
->drop_queue
, &list
);
701 spin_unlock_irqrestore(&data
->drop_queue
.lock
, flags
);
703 while ((skb
= __skb_dequeue(&list
)))
704 net_dm_packet_report(skb
);
708 net_dm_flow_action_cookie_size(const struct net_dm_hw_metadata
*hw_metadata
)
710 return hw_metadata
->fa_cookie
?
711 nla_total_size(hw_metadata
->fa_cookie
->cookie_len
) : 0;
715 net_dm_hw_packet_report_size(size_t payload_len
,
716 const struct net_dm_hw_metadata
*hw_metadata
)
720 size
= nlmsg_msg_size(GENL_HDRLEN
+ net_drop_monitor_family
.hdrsize
);
722 return NLMSG_ALIGN(size
) +
723 /* NET_DM_ATTR_ORIGIN */
724 nla_total_size(sizeof(u16
)) +
725 /* NET_DM_ATTR_HW_TRAP_GROUP_NAME */
726 nla_total_size(strlen(hw_metadata
->trap_group_name
) + 1) +
727 /* NET_DM_ATTR_HW_TRAP_NAME */
728 nla_total_size(strlen(hw_metadata
->trap_name
) + 1) +
729 /* NET_DM_ATTR_IN_PORT */
730 net_dm_in_port_size() +
731 /* NET_DM_ATTR_FLOW_ACTION_COOKIE */
732 net_dm_flow_action_cookie_size(hw_metadata
) +
733 /* NET_DM_ATTR_TIMESTAMP */
734 nla_total_size(sizeof(u64
)) +
735 /* NET_DM_ATTR_ORIG_LEN */
736 nla_total_size(sizeof(u32
)) +
737 /* NET_DM_ATTR_PROTO */
738 nla_total_size(sizeof(u16
)) +
739 /* NET_DM_ATTR_PAYLOAD */
740 nla_total_size(payload_len
);
743 static int net_dm_hw_packet_report_fill(struct sk_buff
*msg
,
744 struct sk_buff
*skb
, size_t payload_len
)
746 struct net_dm_hw_metadata
*hw_metadata
;
750 hw_metadata
= NET_DM_SKB_CB(skb
)->hw_metadata
;
752 hdr
= genlmsg_put(msg
, 0, 0, &net_drop_monitor_family
, 0,
753 NET_DM_CMD_PACKET_ALERT
);
757 if (nla_put_u16(msg
, NET_DM_ATTR_ORIGIN
, NET_DM_ORIGIN_HW
))
758 goto nla_put_failure
;
760 if (nla_put_string(msg
, NET_DM_ATTR_HW_TRAP_GROUP_NAME
,
761 hw_metadata
->trap_group_name
))
762 goto nla_put_failure
;
764 if (nla_put_string(msg
, NET_DM_ATTR_HW_TRAP_NAME
,
765 hw_metadata
->trap_name
))
766 goto nla_put_failure
;
768 if (hw_metadata
->input_dev
) {
769 struct net_device
*dev
= hw_metadata
->input_dev
;
772 rc
= net_dm_packet_report_in_port_put(msg
, dev
->ifindex
,
775 goto nla_put_failure
;
778 if (hw_metadata
->fa_cookie
&&
779 nla_put(msg
, NET_DM_ATTR_FLOW_ACTION_COOKIE
,
780 hw_metadata
->fa_cookie
->cookie_len
,
781 hw_metadata
->fa_cookie
->cookie
))
782 goto nla_put_failure
;
784 if (nla_put_u64_64bit(msg
, NET_DM_ATTR_TIMESTAMP
,
785 ktime_to_ns(skb
->tstamp
), NET_DM_ATTR_PAD
))
786 goto nla_put_failure
;
788 if (nla_put_u32(msg
, NET_DM_ATTR_ORIG_LEN
, skb
->len
))
789 goto nla_put_failure
;
794 if (nla_put_u16(msg
, NET_DM_ATTR_PROTO
, be16_to_cpu(skb
->protocol
)))
795 goto nla_put_failure
;
797 attr
= skb_put(msg
, nla_total_size(payload_len
));
798 attr
->nla_type
= NET_DM_ATTR_PAYLOAD
;
799 attr
->nla_len
= nla_attr_size(payload_len
);
800 if (skb_copy_bits(skb
, 0, nla_data(attr
), payload_len
))
801 goto nla_put_failure
;
804 genlmsg_end(msg
, hdr
);
809 genlmsg_cancel(msg
, hdr
);
813 static struct net_dm_hw_metadata
*
814 net_dm_hw_metadata_clone(const struct net_dm_hw_metadata
*hw_metadata
)
816 const struct flow_action_cookie
*fa_cookie
;
817 struct net_dm_hw_metadata
*n_hw_metadata
;
818 const char *trap_group_name
;
819 const char *trap_name
;
821 n_hw_metadata
= kzalloc(sizeof(*hw_metadata
), GFP_ATOMIC
);
825 trap_group_name
= kstrdup(hw_metadata
->trap_group_name
, GFP_ATOMIC
);
826 if (!trap_group_name
)
827 goto free_hw_metadata
;
828 n_hw_metadata
->trap_group_name
= trap_group_name
;
830 trap_name
= kstrdup(hw_metadata
->trap_name
, GFP_ATOMIC
);
832 goto free_trap_group
;
833 n_hw_metadata
->trap_name
= trap_name
;
835 if (hw_metadata
->fa_cookie
) {
836 size_t cookie_size
= sizeof(*fa_cookie
) +
837 hw_metadata
->fa_cookie
->cookie_len
;
839 fa_cookie
= kmemdup(hw_metadata
->fa_cookie
, cookie_size
,
843 n_hw_metadata
->fa_cookie
= fa_cookie
;
846 n_hw_metadata
->input_dev
= hw_metadata
->input_dev
;
847 if (n_hw_metadata
->input_dev
)
848 dev_hold(n_hw_metadata
->input_dev
);
850 return n_hw_metadata
;
855 kfree(trap_group_name
);
857 kfree(n_hw_metadata
);
862 net_dm_hw_metadata_free(const struct net_dm_hw_metadata
*hw_metadata
)
864 if (hw_metadata
->input_dev
)
865 dev_put(hw_metadata
->input_dev
);
866 kfree(hw_metadata
->fa_cookie
);
867 kfree(hw_metadata
->trap_name
);
868 kfree(hw_metadata
->trap_group_name
);
872 static void net_dm_hw_packet_report(struct sk_buff
*skb
)
874 struct net_dm_hw_metadata
*hw_metadata
;
879 if (skb
->data
> skb_mac_header(skb
))
880 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
882 skb_pull(skb
, skb_mac_header(skb
) - skb
->data
);
884 payload_len
= min_t(size_t, skb
->len
, NET_DM_MAX_PACKET_SIZE
);
885 if (net_dm_trunc_len
)
886 payload_len
= min_t(size_t, net_dm_trunc_len
, payload_len
);
888 hw_metadata
= NET_DM_SKB_CB(skb
)->hw_metadata
;
889 msg
= nlmsg_new(net_dm_hw_packet_report_size(payload_len
, hw_metadata
),
894 rc
= net_dm_hw_packet_report_fill(msg
, skb
, payload_len
);
900 genlmsg_multicast(&net_drop_monitor_family
, msg
, 0, 0, GFP_KERNEL
);
903 net_dm_hw_metadata_free(NET_DM_SKB_CB(skb
)->hw_metadata
);
907 static void net_dm_hw_packet_work(struct work_struct
*work
)
909 struct per_cpu_dm_data
*hw_data
;
910 struct sk_buff_head list
;
914 hw_data
= container_of(work
, struct per_cpu_dm_data
, dm_alert_work
);
916 __skb_queue_head_init(&list
);
918 spin_lock_irqsave(&hw_data
->drop_queue
.lock
, flags
);
919 skb_queue_splice_tail_init(&hw_data
->drop_queue
, &list
);
920 spin_unlock_irqrestore(&hw_data
->drop_queue
.lock
, flags
);
922 while ((skb
= __skb_dequeue(&list
)))
923 net_dm_hw_packet_report(skb
);
927 net_dm_hw_packet_probe(struct sk_buff
*skb
,
928 const struct net_dm_hw_metadata
*hw_metadata
)
930 struct net_dm_hw_metadata
*n_hw_metadata
;
931 ktime_t tstamp
= ktime_get_real();
932 struct per_cpu_dm_data
*hw_data
;
933 struct sk_buff
*nskb
;
936 if (!skb_mac_header_was_set(skb
))
939 nskb
= skb_clone(skb
, GFP_ATOMIC
);
943 n_hw_metadata
= net_dm_hw_metadata_clone(hw_metadata
);
947 NET_DM_SKB_CB(nskb
)->hw_metadata
= n_hw_metadata
;
948 nskb
->tstamp
= tstamp
;
950 hw_data
= this_cpu_ptr(&dm_hw_cpu_data
);
952 spin_lock_irqsave(&hw_data
->drop_queue
.lock
, flags
);
953 if (skb_queue_len(&hw_data
->drop_queue
) < net_dm_queue_len
)
954 __skb_queue_tail(&hw_data
->drop_queue
, nskb
);
957 spin_unlock_irqrestore(&hw_data
->drop_queue
.lock
, flags
);
959 schedule_work(&hw_data
->dm_alert_work
);
964 spin_unlock_irqrestore(&hw_data
->drop_queue
.lock
, flags
);
965 u64_stats_update_begin(&hw_data
->stats
.syncp
);
966 hw_data
->stats
.dropped
++;
967 u64_stats_update_end(&hw_data
->stats
.syncp
);
968 net_dm_hw_metadata_free(n_hw_metadata
);
973 static const struct net_dm_alert_ops net_dm_alert_packet_ops
= {
974 .kfree_skb_probe
= net_dm_packet_trace_kfree_skb_hit
,
975 .napi_poll_probe
= net_dm_packet_trace_napi_poll_hit
,
976 .work_item_func
= net_dm_packet_work
,
977 .hw_work_item_func
= net_dm_hw_packet_work
,
978 .hw_probe
= net_dm_hw_packet_probe
,
981 static const struct net_dm_alert_ops
*net_dm_alert_ops_arr
[] = {
982 [NET_DM_ALERT_MODE_SUMMARY
] = &net_dm_alert_summary_ops
,
983 [NET_DM_ALERT_MODE_PACKET
] = &net_dm_alert_packet_ops
,
986 void net_dm_hw_report(struct sk_buff
*skb
,
987 const struct net_dm_hw_metadata
*hw_metadata
)
994 net_dm_alert_ops_arr
[net_dm_alert_mode
]->hw_probe(skb
, hw_metadata
);
999 EXPORT_SYMBOL_GPL(net_dm_hw_report
);
1001 static int net_dm_hw_monitor_start(struct netlink_ext_ack
*extack
)
1003 const struct net_dm_alert_ops
*ops
;
1007 NL_SET_ERR_MSG_MOD(extack
, "Hardware monitoring already enabled");
1011 ops
= net_dm_alert_ops_arr
[net_dm_alert_mode
];
1013 if (!try_module_get(THIS_MODULE
)) {
1014 NL_SET_ERR_MSG_MOD(extack
, "Failed to take reference on module");
1018 for_each_possible_cpu(cpu
) {
1019 struct per_cpu_dm_data
*hw_data
= &per_cpu(dm_hw_cpu_data
, cpu
);
1020 struct net_dm_hw_entries
*hw_entries
;
1022 INIT_WORK(&hw_data
->dm_alert_work
, ops
->hw_work_item_func
);
1023 timer_setup(&hw_data
->send_timer
, sched_send_work
, 0);
1024 hw_entries
= net_dm_hw_reset_per_cpu_data(hw_data
);
1033 static void net_dm_hw_monitor_stop(struct netlink_ext_ack
*extack
)
1038 NL_SET_ERR_MSG_MOD(extack
, "Hardware monitoring already disabled");
1044 /* After this call returns we are guaranteed that no CPU is processing
1045 * any hardware drops.
1049 for_each_possible_cpu(cpu
) {
1050 struct per_cpu_dm_data
*hw_data
= &per_cpu(dm_hw_cpu_data
, cpu
);
1051 struct sk_buff
*skb
;
1053 del_timer_sync(&hw_data
->send_timer
);
1054 cancel_work_sync(&hw_data
->dm_alert_work
);
1055 while ((skb
= __skb_dequeue(&hw_data
->drop_queue
))) {
1056 struct net_dm_hw_metadata
*hw_metadata
;
1058 hw_metadata
= NET_DM_SKB_CB(skb
)->hw_metadata
;
1059 net_dm_hw_metadata_free(hw_metadata
);
1064 module_put(THIS_MODULE
);
1067 static int net_dm_trace_on_set(struct netlink_ext_ack
*extack
)
1069 const struct net_dm_alert_ops
*ops
;
1072 ops
= net_dm_alert_ops_arr
[net_dm_alert_mode
];
1074 if (!try_module_get(THIS_MODULE
)) {
1075 NL_SET_ERR_MSG_MOD(extack
, "Failed to take reference on module");
1079 for_each_possible_cpu(cpu
) {
1080 struct per_cpu_dm_data
*data
= &per_cpu(dm_cpu_data
, cpu
);
1081 struct sk_buff
*skb
;
1083 INIT_WORK(&data
->dm_alert_work
, ops
->work_item_func
);
1084 timer_setup(&data
->send_timer
, sched_send_work
, 0);
1085 /* Allocate a new per-CPU skb for the summary alert message and
1086 * free the old one which might contain stale data from
1089 skb
= reset_per_cpu_data(data
);
1093 rc
= register_trace_kfree_skb(ops
->kfree_skb_probe
, NULL
);
1095 NL_SET_ERR_MSG_MOD(extack
, "Failed to connect probe to kfree_skb() tracepoint");
1096 goto err_module_put
;
1099 rc
= register_trace_napi_poll(ops
->napi_poll_probe
, NULL
);
1101 NL_SET_ERR_MSG_MOD(extack
, "Failed to connect probe to napi_poll() tracepoint");
1102 goto err_unregister_trace
;
1107 err_unregister_trace
:
1108 unregister_trace_kfree_skb(ops
->kfree_skb_probe
, NULL
);
1110 module_put(THIS_MODULE
);
1114 static void net_dm_trace_off_set(void)
1116 struct dm_hw_stat_delta
*new_stat
, *temp
;
1117 const struct net_dm_alert_ops
*ops
;
1120 ops
= net_dm_alert_ops_arr
[net_dm_alert_mode
];
1122 unregister_trace_napi_poll(ops
->napi_poll_probe
, NULL
);
1123 unregister_trace_kfree_skb(ops
->kfree_skb_probe
, NULL
);
1125 tracepoint_synchronize_unregister();
1127 /* Make sure we do not send notifications to user space after request
1128 * to stop tracing returns.
1130 for_each_possible_cpu(cpu
) {
1131 struct per_cpu_dm_data
*data
= &per_cpu(dm_cpu_data
, cpu
);
1132 struct sk_buff
*skb
;
1134 del_timer_sync(&data
->send_timer
);
1135 cancel_work_sync(&data
->dm_alert_work
);
1136 while ((skb
= __skb_dequeue(&data
->drop_queue
)))
1140 list_for_each_entry_safe(new_stat
, temp
, &hw_stats_list
, list
) {
1141 if (new_stat
->dev
== NULL
) {
1142 list_del_rcu(&new_stat
->list
);
1143 kfree_rcu(new_stat
, rcu
);
1147 module_put(THIS_MODULE
);
1150 static int set_all_monitor_traces(int state
, struct netlink_ext_ack
*extack
)
1154 if (state
== trace_state
) {
1155 NL_SET_ERR_MSG_MOD(extack
, "Trace state already set to requested state");
1161 rc
= net_dm_trace_on_set(extack
);
1164 net_dm_trace_off_set();
1172 trace_state
= state
;
1179 static bool net_dm_is_monitoring(void)
1181 return trace_state
== TRACE_ON
|| monitor_hw
;
1184 static int net_dm_alert_mode_get_from_info(struct genl_info
*info
,
1185 enum net_dm_alert_mode
*p_alert_mode
)
1189 val
= nla_get_u8(info
->attrs
[NET_DM_ATTR_ALERT_MODE
]);
1192 case NET_DM_ALERT_MODE_SUMMARY
: /* fall-through */
1193 case NET_DM_ALERT_MODE_PACKET
:
1194 *p_alert_mode
= val
;
1203 static int net_dm_alert_mode_set(struct genl_info
*info
)
1205 struct netlink_ext_ack
*extack
= info
->extack
;
1206 enum net_dm_alert_mode alert_mode
;
1209 if (!info
->attrs
[NET_DM_ATTR_ALERT_MODE
])
1212 rc
= net_dm_alert_mode_get_from_info(info
, &alert_mode
);
1214 NL_SET_ERR_MSG_MOD(extack
, "Invalid alert mode");
1218 net_dm_alert_mode
= alert_mode
;
1223 static void net_dm_trunc_len_set(struct genl_info
*info
)
1225 if (!info
->attrs
[NET_DM_ATTR_TRUNC_LEN
])
1228 net_dm_trunc_len
= nla_get_u32(info
->attrs
[NET_DM_ATTR_TRUNC_LEN
]);
1231 static void net_dm_queue_len_set(struct genl_info
*info
)
1233 if (!info
->attrs
[NET_DM_ATTR_QUEUE_LEN
])
1236 net_dm_queue_len
= nla_get_u32(info
->attrs
[NET_DM_ATTR_QUEUE_LEN
]);
1239 static int net_dm_cmd_config(struct sk_buff
*skb
,
1240 struct genl_info
*info
)
1242 struct netlink_ext_ack
*extack
= info
->extack
;
1245 if (net_dm_is_monitoring()) {
1246 NL_SET_ERR_MSG_MOD(extack
, "Cannot configure drop monitor during monitoring");
1250 rc
= net_dm_alert_mode_set(info
);
1254 net_dm_trunc_len_set(info
);
1256 net_dm_queue_len_set(info
);
1261 static int net_dm_monitor_start(bool set_sw
, bool set_hw
,
1262 struct netlink_ext_ack
*extack
)
1264 bool sw_set
= false;
1268 rc
= set_all_monitor_traces(TRACE_ON
, extack
);
1275 rc
= net_dm_hw_monitor_start(extack
);
1277 goto err_monitor_hw
;
1284 set_all_monitor_traces(TRACE_OFF
, extack
);
1288 static void net_dm_monitor_stop(bool set_sw
, bool set_hw
,
1289 struct netlink_ext_ack
*extack
)
1292 net_dm_hw_monitor_stop(extack
);
1294 set_all_monitor_traces(TRACE_OFF
, extack
);
1297 static int net_dm_cmd_trace(struct sk_buff
*skb
,
1298 struct genl_info
*info
)
1300 bool set_sw
= !!info
->attrs
[NET_DM_ATTR_SW_DROPS
];
1301 bool set_hw
= !!info
->attrs
[NET_DM_ATTR_HW_DROPS
];
1302 struct netlink_ext_ack
*extack
= info
->extack
;
1304 /* To maintain backward compatibility, we start / stop monitoring of
1305 * software drops if no flag is specified.
1307 if (!set_sw
&& !set_hw
)
1310 switch (info
->genlhdr
->cmd
) {
1311 case NET_DM_CMD_START
:
1312 return net_dm_monitor_start(set_sw
, set_hw
, extack
);
1313 case NET_DM_CMD_STOP
:
1314 net_dm_monitor_stop(set_sw
, set_hw
, extack
);
1321 static int net_dm_config_fill(struct sk_buff
*msg
, struct genl_info
*info
)
1325 hdr
= genlmsg_put(msg
, info
->snd_portid
, info
->snd_seq
,
1326 &net_drop_monitor_family
, 0, NET_DM_CMD_CONFIG_NEW
);
1330 if (nla_put_u8(msg
, NET_DM_ATTR_ALERT_MODE
, net_dm_alert_mode
))
1331 goto nla_put_failure
;
1333 if (nla_put_u32(msg
, NET_DM_ATTR_TRUNC_LEN
, net_dm_trunc_len
))
1334 goto nla_put_failure
;
1336 if (nla_put_u32(msg
, NET_DM_ATTR_QUEUE_LEN
, net_dm_queue_len
))
1337 goto nla_put_failure
;
1339 genlmsg_end(msg
, hdr
);
1344 genlmsg_cancel(msg
, hdr
);
1348 static int net_dm_cmd_config_get(struct sk_buff
*skb
, struct genl_info
*info
)
1350 struct sk_buff
*msg
;
1353 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
1357 rc
= net_dm_config_fill(msg
, info
);
1361 return genlmsg_reply(msg
, info
);
1368 static void net_dm_stats_read(struct net_dm_stats
*stats
)
1372 memset(stats
, 0, sizeof(*stats
));
1373 for_each_possible_cpu(cpu
) {
1374 struct per_cpu_dm_data
*data
= &per_cpu(dm_cpu_data
, cpu
);
1375 struct net_dm_stats
*cpu_stats
= &data
->stats
;
1380 start
= u64_stats_fetch_begin_irq(&cpu_stats
->syncp
);
1381 dropped
= cpu_stats
->dropped
;
1382 } while (u64_stats_fetch_retry_irq(&cpu_stats
->syncp
, start
));
1384 stats
->dropped
+= dropped
;
1388 static int net_dm_stats_put(struct sk_buff
*msg
)
1390 struct net_dm_stats stats
;
1391 struct nlattr
*attr
;
1393 net_dm_stats_read(&stats
);
1395 attr
= nla_nest_start(msg
, NET_DM_ATTR_STATS
);
1399 if (nla_put_u64_64bit(msg
, NET_DM_ATTR_STATS_DROPPED
,
1400 stats
.dropped
, NET_DM_ATTR_PAD
))
1401 goto nla_put_failure
;
1403 nla_nest_end(msg
, attr
);
1408 nla_nest_cancel(msg
, attr
);
1412 static void net_dm_hw_stats_read(struct net_dm_stats
*stats
)
1416 memset(stats
, 0, sizeof(*stats
));
1417 for_each_possible_cpu(cpu
) {
1418 struct per_cpu_dm_data
*hw_data
= &per_cpu(dm_hw_cpu_data
, cpu
);
1419 struct net_dm_stats
*cpu_stats
= &hw_data
->stats
;
1424 start
= u64_stats_fetch_begin_irq(&cpu_stats
->syncp
);
1425 dropped
= cpu_stats
->dropped
;
1426 } while (u64_stats_fetch_retry_irq(&cpu_stats
->syncp
, start
));
1428 stats
->dropped
+= dropped
;
1432 static int net_dm_hw_stats_put(struct sk_buff
*msg
)
1434 struct net_dm_stats stats
;
1435 struct nlattr
*attr
;
1437 net_dm_hw_stats_read(&stats
);
1439 attr
= nla_nest_start(msg
, NET_DM_ATTR_HW_STATS
);
1443 if (nla_put_u64_64bit(msg
, NET_DM_ATTR_STATS_DROPPED
,
1444 stats
.dropped
, NET_DM_ATTR_PAD
))
1445 goto nla_put_failure
;
1447 nla_nest_end(msg
, attr
);
1452 nla_nest_cancel(msg
, attr
);
1456 static int net_dm_stats_fill(struct sk_buff
*msg
, struct genl_info
*info
)
1461 hdr
= genlmsg_put(msg
, info
->snd_portid
, info
->snd_seq
,
1462 &net_drop_monitor_family
, 0, NET_DM_CMD_STATS_NEW
);
1466 rc
= net_dm_stats_put(msg
);
1468 goto nla_put_failure
;
1470 rc
= net_dm_hw_stats_put(msg
);
1472 goto nla_put_failure
;
1474 genlmsg_end(msg
, hdr
);
1479 genlmsg_cancel(msg
, hdr
);
1483 static int net_dm_cmd_stats_get(struct sk_buff
*skb
, struct genl_info
*info
)
1485 struct sk_buff
*msg
;
1488 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
1492 rc
= net_dm_stats_fill(msg
, info
);
1496 return genlmsg_reply(msg
, info
);
1503 static int dropmon_net_event(struct notifier_block
*ev_block
,
1504 unsigned long event
, void *ptr
)
1506 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1507 struct dm_hw_stat_delta
*new_stat
= NULL
;
1508 struct dm_hw_stat_delta
*tmp
;
1511 case NETDEV_REGISTER
:
1512 new_stat
= kzalloc(sizeof(struct dm_hw_stat_delta
), GFP_KERNEL
);
1517 new_stat
->dev
= dev
;
1518 new_stat
->last_rx
= jiffies
;
1519 mutex_lock(&net_dm_mutex
);
1520 list_add_rcu(&new_stat
->list
, &hw_stats_list
);
1521 mutex_unlock(&net_dm_mutex
);
1523 case NETDEV_UNREGISTER
:
1524 mutex_lock(&net_dm_mutex
);
1525 list_for_each_entry_safe(new_stat
, tmp
, &hw_stats_list
, list
) {
1526 if (new_stat
->dev
== dev
) {
1527 new_stat
->dev
= NULL
;
1528 if (trace_state
== TRACE_OFF
) {
1529 list_del_rcu(&new_stat
->list
);
1530 kfree_rcu(new_stat
, rcu
);
1535 mutex_unlock(&net_dm_mutex
);
1542 static const struct nla_policy net_dm_nl_policy
[NET_DM_ATTR_MAX
+ 1] = {
1543 [NET_DM_ATTR_UNSPEC
] = { .strict_start_type
= NET_DM_ATTR_UNSPEC
+ 1 },
1544 [NET_DM_ATTR_ALERT_MODE
] = { .type
= NLA_U8
},
1545 [NET_DM_ATTR_TRUNC_LEN
] = { .type
= NLA_U32
},
1546 [NET_DM_ATTR_QUEUE_LEN
] = { .type
= NLA_U32
},
1547 [NET_DM_ATTR_SW_DROPS
] = {. type
= NLA_FLAG
},
1548 [NET_DM_ATTR_HW_DROPS
] = {. type
= NLA_FLAG
},
1551 static const struct genl_ops dropmon_ops
[] = {
1553 .cmd
= NET_DM_CMD_CONFIG
,
1554 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
1555 .doit
= net_dm_cmd_config
,
1556 .flags
= GENL_ADMIN_PERM
,
1559 .cmd
= NET_DM_CMD_START
,
1560 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
1561 .doit
= net_dm_cmd_trace
,
1564 .cmd
= NET_DM_CMD_STOP
,
1565 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
1566 .doit
= net_dm_cmd_trace
,
1569 .cmd
= NET_DM_CMD_CONFIG_GET
,
1570 .doit
= net_dm_cmd_config_get
,
1573 .cmd
= NET_DM_CMD_STATS_GET
,
1574 .doit
= net_dm_cmd_stats_get
,
1578 static int net_dm_nl_pre_doit(const struct genl_ops
*ops
,
1579 struct sk_buff
*skb
, struct genl_info
*info
)
1581 mutex_lock(&net_dm_mutex
);
1586 static void net_dm_nl_post_doit(const struct genl_ops
*ops
,
1587 struct sk_buff
*skb
, struct genl_info
*info
)
1589 mutex_unlock(&net_dm_mutex
);
1592 static struct genl_family net_drop_monitor_family __ro_after_init
= {
1596 .maxattr
= NET_DM_ATTR_MAX
,
1597 .policy
= net_dm_nl_policy
,
1598 .pre_doit
= net_dm_nl_pre_doit
,
1599 .post_doit
= net_dm_nl_post_doit
,
1600 .module
= THIS_MODULE
,
1602 .n_ops
= ARRAY_SIZE(dropmon_ops
),
1603 .mcgrps
= dropmon_mcgrps
,
1604 .n_mcgrps
= ARRAY_SIZE(dropmon_mcgrps
),
1607 static struct notifier_block dropmon_net_notifier
= {
1608 .notifier_call
= dropmon_net_event
1611 static void __net_dm_cpu_data_init(struct per_cpu_dm_data
*data
)
1613 spin_lock_init(&data
->lock
);
1614 skb_queue_head_init(&data
->drop_queue
);
1615 u64_stats_init(&data
->stats
.syncp
);
1618 static void __net_dm_cpu_data_fini(struct per_cpu_dm_data
*data
)
1620 WARN_ON(!skb_queue_empty(&data
->drop_queue
));
1623 static void net_dm_cpu_data_init(int cpu
)
1625 struct per_cpu_dm_data
*data
;
1627 data
= &per_cpu(dm_cpu_data
, cpu
);
1628 __net_dm_cpu_data_init(data
);
1631 static void net_dm_cpu_data_fini(int cpu
)
1633 struct per_cpu_dm_data
*data
;
1635 data
= &per_cpu(dm_cpu_data
, cpu
);
1636 /* At this point, we should have exclusive access
1637 * to this struct and can free the skb inside it.
1639 consume_skb(data
->skb
);
1640 __net_dm_cpu_data_fini(data
);
1643 static void net_dm_hw_cpu_data_init(int cpu
)
1645 struct per_cpu_dm_data
*hw_data
;
1647 hw_data
= &per_cpu(dm_hw_cpu_data
, cpu
);
1648 __net_dm_cpu_data_init(hw_data
);
1651 static void net_dm_hw_cpu_data_fini(int cpu
)
1653 struct per_cpu_dm_data
*hw_data
;
1655 hw_data
= &per_cpu(dm_hw_cpu_data
, cpu
);
1656 kfree(hw_data
->hw_entries
);
1657 __net_dm_cpu_data_fini(hw_data
);
1660 static int __init
init_net_drop_monitor(void)
1664 pr_info("Initializing network drop monitor service\n");
1666 if (sizeof(void *) > 8) {
1667 pr_err("Unable to store program counters on this arch, Drop monitor failed\n");
1671 rc
= genl_register_family(&net_drop_monitor_family
);
1673 pr_err("Could not create drop monitor netlink family\n");
1676 WARN_ON(net_drop_monitor_family
.mcgrp_offset
!= NET_DM_GRP_ALERT
);
1678 rc
= register_netdevice_notifier(&dropmon_net_notifier
);
1680 pr_crit("Failed to register netdevice notifier\n");
1686 for_each_possible_cpu(cpu
) {
1687 net_dm_cpu_data_init(cpu
);
1688 net_dm_hw_cpu_data_init(cpu
);
1694 genl_unregister_family(&net_drop_monitor_family
);
1699 static void exit_net_drop_monitor(void)
1703 BUG_ON(unregister_netdevice_notifier(&dropmon_net_notifier
));
1706 * Because of the module_get/put we do in the trace state change path
1707 * we are guarnateed not to have any current users when we get here
1710 for_each_possible_cpu(cpu
) {
1711 net_dm_hw_cpu_data_fini(cpu
);
1712 net_dm_cpu_data_fini(cpu
);
1715 BUG_ON(genl_unregister_family(&net_drop_monitor_family
));
1718 module_init(init_net_drop_monitor
);
1719 module_exit(exit_net_drop_monitor
);
1721 MODULE_LICENSE("GPL v2");
1722 MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver.com>");
1723 MODULE_ALIAS_GENL_FAMILY("NET_DM");