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authorSamuel Ortiz <sameo@linux.intel.com>2012-03-05 01:03:42 +0100
committerJohn W. Linville <linville@tuxdriver.com>2012-03-06 21:16:22 +0100
commitd094afa155273e03b82981ea818d39c7a2dfba86 (patch)
tree85aafb65a5612c9d30fb68118a18948e22178f68 /net/nfc
parentNFC: Set the right LLCP N(R) value for I frames (diff)
downloadlinux-d094afa155273e03b82981ea818d39c7a2dfba86.tar.xz
linux-d094afa155273e03b82981ea818d39c7a2dfba86.zip
NFC: Send LLCP RR frames to acknowledge received I frames
In order to acknowledge an I frame, we have to either queue pending local I frames or queue a receiver ready frame. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/nfc')
-rw-r--r--net/nfc/llcp/commands.c24
-rw-r--r--net/nfc/llcp/llcp.c9
-rw-r--r--net/nfc/llcp/llcp.h3
3 files changed, 33 insertions, 3 deletions
diff --git a/net/nfc/llcp/commands.c b/net/nfc/llcp/commands.c
index f6c2257c11aa..8ebd322b11eb 100644
--- a/net/nfc/llcp/commands.c
+++ b/net/nfc/llcp/commands.c
@@ -428,3 +428,27 @@ int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
return 0;
}
+
+int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
+{
+ struct sk_buff *skb;
+ struct nfc_llcp_local *local;
+
+ pr_debug("Send rr nr %d\n", sock->recv_n);
+
+ local = sock->local;
+ if (local == NULL)
+ return -ENODEV;
+
+ skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
+ if (skb == NULL)
+ return -ENOMEM;
+
+ skb_put(skb, LLCP_SEQUENCE_SIZE);
+
+ skb->data[2] = sock->recv_n % 16;
+
+ skb_queue_head(&local->tx_queue, skb);
+
+ return 0;
+}
diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c
index 2506810cd780..a0cb133c610a 100644
--- a/net/nfc/llcp/llcp.c
+++ b/net/nfc/llcp/llcp.c
@@ -627,8 +627,9 @@ fail:
}
-void nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
+int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
{
+ int nr_frames = 0;
struct nfc_llcp_local *local = sock->local;
pr_debug("Remote ready %d tx queue len %d remote rw %d",
@@ -651,7 +652,10 @@ void nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
skb_queue_tail(&local->tx_queue, pdu);
skb_queue_tail(&sock->tx_pending_queue, pending_pdu);
+ nr_frames++;
}
+
+ return nr_frames;
}
static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
@@ -716,7 +720,8 @@ static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
else if (ptype == LLCP_PDU_RNR)
llcp_sock->remote_ready = false;
- nfc_llcp_queue_i_frames(llcp_sock);
+ if (nfc_llcp_queue_i_frames(llcp_sock) == 0)
+ nfc_llcp_send_rr(llcp_sock);
release_sock(sk);
nfc_llcp_sock_put(llcp_sock);
diff --git a/net/nfc/llcp/llcp.h b/net/nfc/llcp/llcp.h
index 36d8572c8beb..054c64ffdaa7 100644
--- a/net/nfc/llcp/llcp.h
+++ b/net/nfc/llcp/llcp.h
@@ -165,7 +165,7 @@ u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
struct nfc_llcp_sock *sock);
u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
-void nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
+int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
/* Sock API */
struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp);
@@ -190,6 +190,7 @@ int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
struct msghdr *msg, size_t len);
+int nfc_llcp_send_rr(struct nfc_llcp_sock *sock);
/* Socket API */
int __init nfc_llcp_sock_init(void);