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/*
* ring buffer based tracer for analyzing per-socket skb sources
*
* Neil Horman <nhorman@tuxdriver.com>
* Copyright (C) 2009
*
*
*/
#include <linux/init.h>
#include <linux/debugfs.h>
#include <trace/events/skb.h>
#include <linux/kallsyms.h>
#include <linux/module.h>
#include <linux/hardirq.h>
#include <linux/netdevice.h>
#include <net/sock.h>
#include "trace.h"
#include "trace_output.h"
EXPORT_TRACEPOINT_SYMBOL_GPL(skb_copy_datagram_iovec);
static struct trace_array *skb_trace;
static int __read_mostly trace_skb_source_enabled;
static void probe_skb_dequeue(const struct sk_buff *skb, int len)
{
struct ring_buffer_event *event;
struct trace_skb_event *entry;
struct trace_array *tr = skb_trace;
struct net_device *dev;
if (!trace_skb_source_enabled)
return;
if (in_interrupt())
return;
event = trace_buffer_lock_reserve(tr, TRACE_SKB_SOURCE,
sizeof(*entry), 0, 0);
if (!event)
return;
entry = ring_buffer_event_data(event);
entry->event_data.pid = current->pid;
entry->event_data.anid = page_to_nid(virt_to_page(skb->data));
entry->event_data.cnid = cpu_to_node(smp_processor_id());
entry->event_data.len = len;
entry->event_data.rx_queue = skb->queue_mapping;
entry->event_data.ccpu = smp_processor_id();
dev = dev_get_by_index(sock_net(skb->sk), skb->iif);
if (dev) {
memcpy(entry->event_data.ifname, dev->name, IFNAMSIZ);
dev_put(dev);
} else {
strcpy(entry->event_data.ifname, "Unknown");
}
trace_buffer_unlock_commit(tr, event, 0, 0);
}
static int tracing_skb_source_register(void)
{
int ret;
ret = register_trace_skb_copy_datagram_iovec(probe_skb_dequeue);
if (ret)
pr_info("skb source trace: Couldn't activate dequeue tracepoint");
return ret;
}
static void start_skb_source_trace(struct trace_array *tr)
{
trace_skb_source_enabled = 1;
}
static void stop_skb_source_trace(struct trace_array *tr)
{
trace_skb_source_enabled = 0;
}
static void skb_source_trace_reset(struct trace_array *tr)
{
trace_skb_source_enabled = 0;
unregister_trace_skb_copy_datagram_iovec(probe_skb_dequeue);
}
static int skb_source_trace_init(struct trace_array *tr)
{
int cpu;
skb_trace = tr;
trace_skb_source_enabled = 1;
tracing_skb_source_register();
for_each_cpu(cpu, cpu_possible_mask)
tracing_reset(tr, cpu);
return 0;
}
static enum print_line_t skb_source_print_line(struct trace_iterator *iter)
{
int ret = 0;
struct trace_entry *entry = iter->ent;
struct trace_skb_event *event;
struct skb_record *record;
struct trace_seq *s = &iter->seq;
trace_assign_type(event, entry);
record = &event->event_data;
if (entry->type != TRACE_SKB_SOURCE)
return TRACE_TYPE_UNHANDLED;
ret = trace_seq_printf(s, " %d %d %d %s %d %d %d\n",
record->pid,
record->anid,
record->cnid,
record->ifname,
record->rx_queue,
record->ccpu,
record->len);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
static void skb_source_print_header(struct seq_file *s)
{
seq_puts(s, "# PID ANID CNID IFC RXQ CCPU LEN\n");
seq_puts(s, "# | | | | | | |\n");
}
static struct tracer skb_source_tracer __read_mostly =
{
.name = "skb_sources",
.init = skb_source_trace_init,
.start = start_skb_source_trace,
.stop = stop_skb_source_trace,
.reset = skb_source_trace_reset,
.print_line = skb_source_print_line,
.print_header = skb_source_print_header,
};
static int init_skb_source_trace(void)
{
return register_tracer(&skb_source_tracer);
}
device_initcall(init_skb_source_trace);
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