net/mac80211/debugfs.c

Source file repositories/reference/linux-study-clean/net/mac80211/debugfs.c

File Facts

System
Linux kernel
Corpus path
net/mac80211/debugfs.c
Extension
.c
Size
18514 bytes
Lines
713
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

static const struct file_operations hwflags_ops = {
	.open = simple_open,
	.read = hwflags_read,
	.write = hwflags_write,
};

static ssize_t misc_read(struct file *file, char __user *user_buf,
			 size_t count, loff_t *ppos)
{
	struct ieee80211_local *local = file->private_data;
	/* Max len of each line is 16 characters, plus 9 for 'pending:\n' */
	size_t bufsz = IEEE80211_MAX_QUEUES * 16 + 9;
	char *buf;
	char *pos, *end;
	ssize_t rv;
	int i;
	int ln;

	buf = kzalloc(bufsz, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	pos = buf;
	end = buf + bufsz - 1;

	pos += scnprintf(pos, end - pos, "pending:\n");

	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
		ln = skb_queue_len(&local->pending[i]);
		pos += scnprintf(pos, end - pos, "[%i] %d\n",
				 i, ln);
	}

	rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
	kfree(buf);
	return rv;
}

static ssize_t queues_read(struct file *file, char __user *user_buf,
			   size_t count, loff_t *ppos)
{
	struct ieee80211_local *local = file->private_data;
	unsigned long flags;
	char buf[IEEE80211_MAX_QUEUES * 20];
	int q, res = 0;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	for (q = 0; q < local->hw.queues; q++)
		res += sprintf(buf + res, "%02d: %#.8lx/%d\n", q,
				local->queue_stop_reasons[q],
				skb_queue_len(&local->pending[q]));
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);

	return simple_read_from_buffer(user_buf, count, ppos, buf, res);
}

DEBUGFS_READONLY_FILE_OPS(queues);
DEBUGFS_READONLY_FILE_OPS(misc);

/* statistics stuff */

static ssize_t format_devstat_counter(struct ieee80211_local *local,
	char __user *userbuf,
	size_t count, loff_t *ppos,
	int (*printvalue)(struct ieee80211_low_level_stats *stats, char *buf,
			  int buflen))
{
	struct ieee80211_low_level_stats stats;
	char buf[20];
	int res;

	wiphy_lock(local->hw.wiphy);
	res = drv_get_stats(local, &stats);
	wiphy_unlock(local->hw.wiphy);
	if (res)
		return res;
	res = printvalue(&stats, buf, sizeof(buf));
	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
}

#define DEBUGFS_DEVSTATS_FILE(name)					\
static int print_devstats_##name(struct ieee80211_low_level_stats *stats,\
				 char *buf, int buflen)			\
{									\
	return scnprintf(buf, buflen, "%u\n", stats->name);		\
}									\
static ssize_t stats_ ##name## _read(struct file *file,			\
				     char __user *userbuf,		\
				     size_t count, loff_t *ppos)	\
{									\

Annotation

Implementation Notes