Bluetooth: Fix/implement Three-wire reliable packet sending
This patch should complete the necessary code for sending reliable
Three-wire packets.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index f50afb2..6c7b27e 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -64,15 +64,15 @@
struct sk_buff *rx_skb; /* Receive buffer */
size_t rx_pending; /* Expecting more bytes */
bool rx_esc; /* SLIP escape mode */
+ u8 rx_ack; /* Last ack number received */
+ u8 rx_seq; /* Last seq number received */
int (*rx_func) (struct hci_uart *hu, u8 c);
struct timer_list timer; /* Retransmission timer */
- bool txack_req;
-
- u8 next_ack;
- u8 next_seq;
+ bool tx_ack_req; /* Pending ack to send */
+ u8 tx_seq; /* Next seq number to send */
};
static void h5_reset_rx(struct h5 *h5);
@@ -89,7 +89,7 @@
spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) {
- h5->next_seq = (h5->next_seq - 1) & 0x07;
+ h5->tx_seq = (h5->tx_seq - 1) & 0x07;
skb_queue_head(&h5->rel, skb);
}
@@ -138,6 +138,45 @@
return 0;
}
+static void h5_pkt_cull(struct h5 *h5)
+{
+ struct sk_buff *skb, *tmp;
+ unsigned long flags;
+ int i, to_remove;
+ u8 seq;
+
+ spin_lock_irqsave(&h5->unack.lock, flags);
+
+ to_remove = skb_queue_len(&h5->unack);
+
+ seq = h5->tx_seq;
+
+ while (to_remove > 0) {
+ if (h5->rx_ack == seq)
+ break;
+
+ to_remove--;
+ seq = (seq - 1) % 8;
+ }
+
+ if (seq != h5->rx_ack)
+ BT_ERR("Controller acked invalid packet");
+
+ i = 0;
+ skb_queue_walk_safe(&h5->unack, skb, tmp) {
+ if (i++ >= to_remove)
+ break;
+
+ __skb_unlink(skb, &h5->unack);
+ kfree_skb(skb);
+ }
+
+ if (skb_queue_empty(&h5->unack))
+ del_timer(&h5->timer);
+
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+}
+
static void h5_handle_internal_rx(struct hci_uart *hu)
{
BT_DBG("%s", hu->hdev->name);
@@ -146,17 +185,24 @@
static void h5_complete_rx_pkt(struct hci_uart *hu)
{
struct h5 *h5 = hu->priv;
- u8 pkt_type;
+ const unsigned char *hdr = h5->rx_skb->data;
BT_DBG("%s", hu->hdev->name);
- pkt_type = h5->rx_skb->data[1] & 0x0f;
+ if (H5_HDR_RELIABLE(hdr)) {
+ h5->tx_seq = (h5->tx_seq + 1) % 8;
+ h5->tx_ack_req = true;
+ }
- switch (pkt_type) {
+ h5->rx_ack = H5_HDR_ACK(hdr);
+
+ h5_pkt_cull(h5);
+
+ switch (H5_HDR_PKT_TYPE(hdr)) {
case HCI_EVENT_PKT:
case HCI_ACLDATA_PKT:
case HCI_SCODATA_PKT:
- bt_cb(h5->rx_skb)->pkt_type = pkt_type;
+ bt_cb(h5->rx_skb)->pkt_type = H5_HDR_PKT_TYPE(hdr);
/* Remove Three-wire header */
skb_pull(h5->rx_skb, 4);
@@ -193,7 +239,7 @@
BT_DBG("%s 0x%02hhx", hu->hdev->name, c);
- if ((hdr[0] >> 4) & 0x01) {
+ if (H5_HDR_CRC(hdr)) {
h5->rx_func = h5_rx_crc;
h5->rx_pending = 2;
} else {
@@ -217,8 +263,15 @@
return 0;
}
+ if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_seq) {
+ BT_ERR("Out-of-order packet arrived (%u != %u)",
+ H5_HDR_SEQ(hdr), h5->tx_seq);
+ h5_reset_rx(h5);
+ return 0;
+ }
+
h5->rx_func = h5_rx_payload;
- h5->rx_pending = ((hdr[1] >> 4) & 0xff) + (hdr[2] << 4);
+ h5->rx_pending = H5_HDR_LEN(hdr);
return 0;
}
@@ -412,13 +465,13 @@
h5_slip_delim(nskb);
- hdr[0] = h5->next_ack << 3;
- h5->txack_req = false;
+ hdr[0] = h5->rx_seq << 3;
+ h5->tx_ack_req = false;
if (rel) {
hdr[0] |= 1 << 7;
- hdr[0] |= h5->next_seq;
- h5->next_seq = (h5->next_seq + 1) % 8;
+ hdr[0] |= h5->tx_seq;
+ h5->tx_seq = (h5->tx_seq + 1) % 8;
}
hdr[1] = pkt_type | ((len & 0x0f) << 4);
@@ -461,7 +514,7 @@
static struct sk_buff *h5_prepare_ack(struct h5 *h5)
{
- h5->txack_req = false;
+ h5->tx_ack_req = false;
return NULL;
}
@@ -505,7 +558,7 @@
unlock:
spin_unlock_irqrestore(&h5->unack.lock, flags);
- if (h5->txack_req)
+ if (h5->tx_ack_req)
return h5_prepare_ack(h5);
return NULL;