net/caif: Use pr_fmt
[linux-2.6.git] / net / caif / cfdgml.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/stddef.h>
10 #include <linux/spinlock.h>
11 #include <linux/slab.h>
12 #include <net/caif/caif_layer.h>
13 #include <net/caif/cfsrvl.h>
14 #include <net/caif/cfpkt.h>
15
16 #define container_obj(layr) ((struct cfsrvl *) layr)
17
18 #define DGM_CMD_BIT  0x80
19 #define DGM_FLOW_OFF 0x81
20 #define DGM_FLOW_ON  0x80
21 #define DGM_CTRL_PKT_SIZE 1
22 #define DGM_MTU 1500
23
24 static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt);
25 static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt);
26
27 struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info)
28 {
29         struct cfsrvl *dgm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
30         if (!dgm) {
31                 pr_warn("Out of memory\n");
32                 return NULL;
33         }
34         caif_assert(offsetof(struct cfsrvl, layer) == 0);
35         memset(dgm, 0, sizeof(struct cfsrvl));
36         cfsrvl_init(dgm, channel_id, dev_info, true);
37         dgm->layer.receive = cfdgml_receive;
38         dgm->layer.transmit = cfdgml_transmit;
39         snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id);
40         dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0';
41         return &dgm->layer;
42 }
43
44 static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt)
45 {
46         u8 cmd = -1;
47         u8 dgmhdr[3];
48         int ret;
49         caif_assert(layr->up != NULL);
50         caif_assert(layr->receive != NULL);
51         caif_assert(layr->ctrlcmd != NULL);
52
53         if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
54                 pr_err("Packet is erroneous!\n");
55                 cfpkt_destroy(pkt);
56                 return -EPROTO;
57         }
58
59         if ((cmd & DGM_CMD_BIT) == 0) {
60                 if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) {
61                         pr_err("Packet is erroneous!\n");
62                         cfpkt_destroy(pkt);
63                         return -EPROTO;
64                 }
65                 ret = layr->up->receive(layr->up, pkt);
66                 return ret;
67         }
68
69         switch (cmd) {
70         case DGM_FLOW_OFF:      /* FLOW OFF */
71                 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
72                 cfpkt_destroy(pkt);
73                 return 0;
74         case DGM_FLOW_ON:       /* FLOW ON */
75                 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
76                 cfpkt_destroy(pkt);
77                 return 0;
78         default:
79                 cfpkt_destroy(pkt);
80                 pr_info("Unknown datagram control %d (0x%x)\n", cmd, cmd);
81                 return -EPROTO;
82         }
83 }
84
85 static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
86 {
87         u32 zero = 0;
88         struct caif_payload_info *info;
89         struct cfsrvl *service = container_obj(layr);
90         int ret;
91         if (!cfsrvl_ready(service, &ret))
92                 return ret;
93
94         /* STE Modem cannot handle more than 1500 bytes datagrams */
95         if (cfpkt_getlen(pkt) > DGM_MTU)
96                 return -EMSGSIZE;
97
98         cfpkt_add_head(pkt, &zero, 4);
99
100         /* Add info for MUX-layer to route the packet out. */
101         info = cfpkt_info(pkt);
102         info->channel_id = service->layer.id;
103         /* To optimize alignment, we add up the size of CAIF header
104          * before payload.
105          */
106         info->hdr_len = 4;
107         info->dev_info = &service->dev_info;
108         ret = layr->dn->transmit(layr->dn, pkt);
109         if (ret < 0) {
110                 u32 tmp32;
111                 cfpkt_extr_head(pkt, &tmp32, 4);
112         }
113         return ret;
114 }