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1 | /* |
2 | * Copyright (C) ST-Ericsson AB 2010 |
3 | * Author: Sjur Brendeland |
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 | |
17 | #define container_obj(layr) ((struct cfsrvl *) layr) |
18 | |
19 | #define DGM_CMD_BIT 0x80 |
20 | #define DGM_FLOW_OFF 0x81 |
21 | #define DGM_FLOW_ON 0x80 |
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 = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC); |
30 | if (!dgm) |
31 | return NULL; |
32 | caif_assert(offsetof(struct cfsrvl, layer) == 0); |
33 | cfsrvl_init(dgm, channel_id, dev_info, true); |
34 | dgm->layer.receive = cfdgml_receive; |
35 | dgm->layer.transmit = cfdgml_transmit; |
36 | snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id); |
37 | dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0'; |
38 | return &dgm->layer; |
39 | } |
40 | |
41 | static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt) |
42 | { |
43 | u8 cmd = -1; |
44 | u8 dgmhdr[3]; |
45 | int ret; |
46 | caif_assert(layr->up != NULL); |
47 | caif_assert(layr->receive != NULL); |
48 | caif_assert(layr->ctrlcmd != NULL); |
49 | |
50 | if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { |
51 | pr_err("Packet is erroneous!\n"); |
52 | cfpkt_destroy(pkt); |
53 | return -EPROTO; |
54 | } |
55 | |
56 | if ((cmd & DGM_CMD_BIT) == 0) { |
57 | if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) { |
58 | pr_err("Packet is erroneous!\n"); |
59 | cfpkt_destroy(pkt); |
60 | return -EPROTO; |
61 | } |
62 | ret = layr->up->receive(layr->up, pkt); |
63 | return ret; |
64 | } |
65 | |
66 | switch (cmd) { |
67 | case DGM_FLOW_OFF: /* FLOW OFF */ |
68 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); |
69 | cfpkt_destroy(pkt); |
70 | return 0; |
71 | case DGM_FLOW_ON: /* FLOW ON */ |
72 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); |
73 | cfpkt_destroy(pkt); |
74 | return 0; |
75 | default: |
76 | cfpkt_destroy(pkt); |
77 | pr_info("Unknown datagram control %d (0x%x)\n", cmd, cmd); |
78 | return -EPROTO; |
79 | } |
80 | } |
81 | |
82 | static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt) |
83 | { |
84 | u8 packet_type; |
85 | u32 zero = 0; |
86 | struct caif_payload_info *info; |
87 | struct cfsrvl *service = container_obj(layr); |
88 | int ret; |
89 | |
90 | if (!cfsrvl_ready(service, &ret)) { |
91 | cfpkt_destroy(pkt); |
92 | return ret; |
93 | } |
94 | |
95 | /* STE Modem cannot handle more than 1500 bytes datagrams */ |
96 | if (cfpkt_getlen(pkt) > DGM_MTU) { |
97 | cfpkt_destroy(pkt); |
98 | return -EMSGSIZE; |
99 | } |
100 | |
101 | cfpkt_add_head(pkt, &zero, 3); |
102 | packet_type = 0x08; /* B9 set - UNCLASSIFIED */ |
103 | cfpkt_add_head(pkt, &packet_type, 1); |
104 | |
105 | /* Add info for MUX-layer to route the packet out. */ |
106 | info = cfpkt_info(pkt); |
107 | info->channel_id = service->layer.id; |
108 | /* To optimize alignment, we add up the size of CAIF header |
109 | * before payload. |
110 | */ |
111 | info->hdr_len = 4; |
112 | info->dev_info = &service->dev_info; |
113 | return layr->dn->transmit(layr->dn, pkt); |
114 | } |
115 |
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v2.6.34-rc5
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