[RFC v2 3/4] Bluetooth: Track per-connection stats

Add per-hci connection rx/tx stats and expose through debugfs
"connections" file.

Example file contents:
                          s            a     p
                  h   t   t  o  s  k   u  s  s  p  r
                  n   y   a  u  s  e   t  e  e  i  e
Dest              l   p   t  t  p  y   h  c  c  n  f
BC:0D:A5:7A:F5:96 14  ACL 1  1  1 0xff 0  1  0  0  1
00:0D:FD:1E:99:30 13  ACL 1  0  0 0xff 4  2  2  0  1
00:07:61:B2:3E:97 12  ACL 1  0  0 0xff 4  0  0  0  2
00:07:61:76:D8:1B 11  ACL 1  0  0 0xff 4  1  0  0  2

                  Rx                           Tx
Dest              bytes       pkt    err null  bytes       pkt    err unack
BC:0D:A5:7A:F5:96 0           0      0   0     0           0      0   7
00:0D:FD:1E:99:30 0           0      0   0     0           0      0   0
00:07:61:B2:3E:97 0           0      0   0     0           0      0   0
00:07:61:76:D8:1B 0           0      0   0     0           0      0   0

Signed-off-by: Peter Hurley <redacted>
---

v2: Add example output to commit msg

 include/net/bluetooth/hci_core.h |   12 ++++++++++++
 net/bluetooth/hci_sysfs.c        |   17 +++++++++++++++++
 2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 6c994c0..1f2ed18 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h

@@ -208,6 +208,16 @@ struct hci_dev {
 	int (*ioctl)(struct hci_dev *hdev, unsigned int cmd, unsigned long arg);
 };
 
+struct hci_conn_stats {
+	__u32	null_rx;
+	__u32	err_rx;
+	__u32	err_tx;
+	__u32	pkt_rx;
+	__u32	pkt_tx;
+	__u32	byte_rx;
+	__u32	byte_tx;
+};
+
 struct hci_conn {
 	struct list_head list;
 

@@ -253,6 +263,8 @@ struct hci_conn {
 	struct work_struct work_add;
 	struct work_struct work_del;
 
+	struct hci_conn_stats stats;
+
 	struct device	dev;
 	atomic_t	devref;
 

diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 3d00769..0775398 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c

@@ -568,6 +568,23 @@ static int connections_show(struct seq_file *f, void *p)
 				atomic_read(&c->devref));
 	}
 
+	seq_printf(f, "\n\n                  Rx                           "
+					"Tx\n");
+	seq_printf(f,     "Dest              bytes       pkt    err null  "
+					"bytes       pkt    err unack\n");
+
+	list_for_each(l, &h->list) {
+		struct hci_conn *c;
+		c = list_entry(l, struct hci_conn, list);
+
+		seq_printf(f,"%s %-11u %-6u %-3u %-5u %-11u %-6u %-3u %u\n",
+				batostr(&c->dst),
+				c->stats.byte_rx, c->stats.pkt_rx,
+				c->stats.err_rx, c->stats.null_rx,
+				c->stats.byte_tx, c->stats.pkt_tx,
+				c->stats.err_tx, c->sent);
+	};
+
 	hci_dev_unlock_bh(hdev);
 
 	return 0;

-- 
1.7.4.1