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Commit 84457960 authored by Samuel Ortiz's avatar Samuel Ortiz
Browse files

NFC: Requeue lost LLCP frames 



When receiving an I or RR frame telling us that some of the pending queues
were not received, we should requeue them before the currently pending ones.

Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 6fbbdc16

net/nfc/llcp/llcp.c

+55 −31
Original line number Original line Diff line number Diff line
@@ -411,28 +411,6 @@ int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) 
				     local->remote_gb_len - 3);

				     local->remote_gb_len - 3);

}

}





static void nfc_llcp_tx_work(struct work_struct *work)

{

	struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,

						    tx_work);

	struct sk_buff *skb;



	skb = skb_dequeue(&local->tx_queue);

	if (skb != NULL) {

		pr_debug("Sending pending skb\n");

		print_hex_dump(KERN_DEBUG, "LLCP Tx: ", DUMP_PREFIX_OFFSET,

			       16, 1, skb->data, skb->len, true);



		nfc_data_exchange(local->dev, local->target_idx,

				  skb, nfc_llcp_recv, local);

	} else {

		nfc_llcp_send_symm(local->dev);

	}



	mod_timer(&local->link_timer,

		  jiffies + msecs_to_jiffies(local->remote_lto));

}



static u8 nfc_llcp_dsap(struct sk_buff *pdu)

static u8 nfc_llcp_dsap(struct sk_buff *pdu)

{

{

	return (pdu->data[0] & 0xfc) >> 2;

	return (pdu->data[0] & 0xfc) >> 2;
@@ -465,6 +443,45 @@ static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) 
	sock->recv_ack_n = (sock->recv_n - 1) % 16;

	sock->recv_ack_n = (sock->recv_n - 1) % 16;

}

}





static void nfc_llcp_tx_work(struct work_struct *work)

{

	struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,

						    tx_work);

	struct sk_buff *skb;

	struct sock *sk;

	struct nfc_llcp_sock *llcp_sock;



	skb = skb_dequeue(&local->tx_queue);

	if (skb != NULL) {

		sk = skb->sk;

		llcp_sock = nfc_llcp_sock(sk);

		if (llcp_sock != NULL) {

			int ret;



			pr_debug("Sending pending skb\n");

			print_hex_dump(KERN_DEBUG, "LLCP Tx: ",

				       DUMP_PREFIX_OFFSET, 16, 1,

				       skb->data, skb->len, true);



			ret = nfc_data_exchange(local->dev, local->target_idx,

						skb, nfc_llcp_recv, local);



			if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) {

				skb = skb_get(skb);

				skb_queue_tail(&llcp_sock->tx_pending_queue,

					       skb);

			}

		} else {

			nfc_llcp_send_symm(local->dev);

		}

	} else {

		nfc_llcp_send_symm(local->dev);

	}



	mod_timer(&local->link_timer,

		  jiffies + msecs_to_jiffies(2 * local->remote_lto));

}



static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,

static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,

							  u8 ssap)

							  u8 ssap)

{

{
@@ -705,7 +722,7 @@ int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) 
	/* Try to queue some I frames for transmission */

	/* Try to queue some I frames for transmission */

	while (sock->remote_ready &&

	while (sock->remote_ready &&

	       skb_queue_len(&sock->tx_pending_queue) < sock->rw) {

	       skb_queue_len(&sock->tx_pending_queue) < sock->rw) {

		struct sk_buff *pdu, *pending_pdu;

		struct sk_buff *pdu;





		pdu = skb_dequeue(&sock->tx_queue);

		pdu = skb_dequeue(&sock->tx_queue);

		if (pdu == NULL)

		if (pdu == NULL)
@@ -714,10 +731,7 @@ int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) 
		/* Update N(S)/N(R) */

		/* Update N(S)/N(R) */

		nfc_llcp_set_nrns(sock, pdu);

		nfc_llcp_set_nrns(sock, pdu);





		pending_pdu = skb_clone(pdu, GFP_KERNEL);



		skb_queue_tail(&local->tx_queue, pdu);

		skb_queue_tail(&local->tx_queue, pdu);

		skb_queue_tail(&sock->tx_pending_queue, pending_pdu);

		nr_frames++;

		nr_frames++;

	}

	}
@@ -774,10 +788,20 @@ static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, 




		llcp_sock->send_ack_n = nr;

		llcp_sock->send_ack_n = nr;





		skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp)

		/* Remove and free all skbs until ns == nr */

			if (nfc_llcp_ns(s) <= nr) {

		skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {

			skb_unlink(s, &llcp_sock->tx_pending_queue);

			skb_unlink(s, &llcp_sock->tx_pending_queue);

			kfree_skb(s);

			kfree_skb(s);



			if (nfc_llcp_ns(s) == nr)

				break;

		}



		/* Re-queue the remaining skbs for transmission */

		skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,

					    s, tmp) {

			skb_unlink(s, &llcp_sock->tx_pending_queue);

			skb_queue_head(&local->tx_queue, s);

		}

		}

	}

	}