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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>
This commit is contained in:
Samuel Ortiz 2012-03-05 01:03:42 +01:00 committed by John W. Linville
parent 0767a7fa87
commit d094afa155
3 changed files with 33 additions and 3 deletions
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24
net/nfc/llcp/commands.c
View File

@ -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;
}

9
net/nfc/llcp/llcp.c
View File

@ -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);

3
net/nfc/llcp/llcp.h
View File

@ -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);