caif: Don't resend if dev_queue_xmit fails.
[linux-2.6.git] / net / caif / cfvidl.c
1 /*
2  * Copyright (C) ST-Ericsson AB 2010
3  * Author:      Sjur Brendeland/sjur.brandeland@stericsson.com
4  * License terms: GNU General Public License (GPL) version 2
5  */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
8
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11 #include <linux/slab.h>
12 #include <linux/errno.h>
13 #include <net/caif/caif_layer.h>
14 #include <net/caif/cfsrvl.h>
15 #include <net/caif/cfpkt.h>
16
17 #define container_obj(layr) ((struct cfsrvl *) layr)
18
19 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
20 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
21
22 struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info)
23 {
24         struct cfsrvl *vid = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
25         if (!vid) {
26                 pr_warn("Out of memory\n");
27                 return NULL;
28         }
29         caif_assert(offsetof(struct cfsrvl, layer) == 0);
30
31         memset(vid, 0, sizeof(struct cfsrvl));
32         cfsrvl_init(vid, channel_id, dev_info, false);
33         vid->layer.receive = cfvidl_receive;
34         vid->layer.transmit = cfvidl_transmit;
35         snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ - 1, "vid1");
36         return &vid->layer;
37 }
38
39 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt)
40 {
41         u32 videoheader;
42         if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) {
43                 pr_err("Packet is erroneous!\n");
44                 cfpkt_destroy(pkt);
45                 return -EPROTO;
46         }
47         return layr->up->receive(layr->up, pkt);
48 }
49
50 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt)
51 {
52         struct cfsrvl *service = container_obj(layr);
53         struct caif_payload_info *info;
54         u32 videoheader = 0;
55         int ret;
56         if (!cfsrvl_ready(service, &ret))
57                 return ret;
58         cfpkt_add_head(pkt, &videoheader, 4);
59         /* Add info for MUX-layer to route the packet out */
60         info = cfpkt_info(pkt);
61         info->channel_id = service->layer.id;
62         info->dev_info = &service->dev_info;
63         return layr->dn->transmit(layr->dn, pkt);
64 }