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authorJohannes Berg <johannes@sipsolutions.net>2009-06-14 17:37:39 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-06-15 15:05:57 -0400
commitdb2e6bd4e966a36c6b2f1921feb3537e8254415c (patch)
tree65e36578e232897b5cf5158d6fd450a86b5efa15 /net
parent3b319aae4244f9b4758212605f67cf63207a4fa1 (diff)
downloadlinux-2.6.34-ux500-db2e6bd4e966a36c6b2f1921feb3537e8254415c.tar.gz
mac80211: add queue debugfs file
I suspect that some driver bugs can cause queues to be stopped while they shouldn't be, but it's hard to find out whether that is the case or not without having any visible information about the queues. This adds a file to debugfs that allows us to see the queues' statuses. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/mac80211/debugfs.c25
-rw-r--r--net/mac80211/ieee80211_i.h1
2 files changed, 26 insertions, 0 deletions
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 11c72311f35..6c439cd5cce 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -163,6 +163,29 @@ static const struct file_operations noack_ops = {
.open = mac80211_open_file_generic
};
+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],
+ __netif_subqueue_stopped(local->mdev, q));
+ spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
+
+ return simple_read_from_buffer(user_buf, count, ppos, buf, res);
+}
+
+static const struct file_operations queues_ops = {
+ .read = queues_read,
+ .open = mac80211_open_file_generic
+};
+
/* statistics stuff */
#define DEBUGFS_STATS_FILE(name, buflen, fmt, value...) \
@@ -298,6 +321,7 @@ void debugfs_hw_add(struct ieee80211_local *local)
DEBUGFS_ADD(total_ps_buffered);
DEBUGFS_ADD(wep_iv);
DEBUGFS_ADD(tsf);
+ DEBUGFS_ADD(queues);
DEBUGFS_ADD_MODE(reset, 0200);
DEBUGFS_ADD(noack);
@@ -350,6 +374,7 @@ void debugfs_hw_del(struct ieee80211_local *local)
DEBUGFS_DEL(total_ps_buffered);
DEBUGFS_DEL(wep_iv);
DEBUGFS_DEL(tsf);
+ DEBUGFS_DEL(queues);
DEBUGFS_DEL(reset);
DEBUGFS_DEL(noack);
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 4dbc2896419..f41fe1f1430 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -783,6 +783,7 @@ struct ieee80211_local {
struct dentry *total_ps_buffered;
struct dentry *wep_iv;
struct dentry *tsf;
+ struct dentry *queues;
struct dentry *reset;
struct dentry *noack;
struct dentry *statistics;