diff options
| -rw-r--r-- | drivers/bluetooth/hci_h5.c | 87 |
1 files changed, 70 insertions, 17 deletions
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 h5 { 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 @@ static void h5_timed_event(unsigned long arg) 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 @@ static int h5_close(struct hci_uart *hu) 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_handle_internal_rx(struct hci_uart *hu) 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 @@ static int h5_rx_payload(struct hci_uart *hu, unsigned char c) 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 @@ static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c) 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 @@ static struct sk_buff *h5_build_pkt(struct h5 *h5, bool rel, u8 pkt_type, 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_pkt(struct h5 *h5, u8 pkt_type, 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 @@ static struct sk_buff *h5_dequeue(struct hci_uart *hu) unlock: spin_unlock_irqrestore(&h5->unack.lock, flags); - if (h5->txack_req) + if (h5->tx_ack_req) return h5_prepare_ack(h5); return NULL; |
