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b482cd20 SB |
1 | /* |
2 | * Copyright (C) ST-Ericsson AB 2010 | |
26ee65e6 | 3 | * Author: Sjur Brendeland |
b482cd20 SB |
4 | * License terms: GNU General Public License (GPL) version 2 |
5 | */ | |
6 | ||
b31fa5ba JP |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
8 | ||
b482cd20 SB |
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 | ||
4a9f65f6 | 16 | |
b482cd20 SB |
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 | |
2aa40aef | 22 | #define DGM_MTU 1500 |
b482cd20 SB |
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 | { | |
7ac2ed0c JP |
29 | struct cfsrvl *dgm = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC); |
30 | if (!dgm) | |
b482cd20 | 31 | return NULL; |
b482cd20 | 32 | caif_assert(offsetof(struct cfsrvl, layer) == 0); |
b1c74247 | 33 | cfsrvl_init(dgm, channel_id, dev_info, true); |
b482cd20 SB |
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) { | |
b31fa5ba | 51 | pr_err("Packet is erroneous!\n"); |
b482cd20 SB |
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) { | |
b31fa5ba | 58 | pr_err("Packet is erroneous!\n"); |
b482cd20 SB |
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); | |
b31fa5ba | 77 | pr_info("Unknown datagram control %d (0x%x)\n", cmd, cmd); |
b482cd20 SB |
78 | return -EPROTO; |
79 | } | |
80 | } | |
81 | ||
82 | static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt) | |
83 | { | |
4a9f65f6 | 84 | u8 packet_type; |
b482cd20 SB |
85 | u32 zero = 0; |
86 | struct caif_payload_info *info; | |
87 | struct cfsrvl *service = container_obj(layr); | |
88 | int ret; | |
374458b3 DT |
89 | |
90 | if (!cfsrvl_ready(service, &ret)) { | |
91 | cfpkt_destroy(pkt); | |
b482cd20 | 92 | return ret; |
374458b3 | 93 | } |
b482cd20 | 94 | |
2aa40aef | 95 | /* STE Modem cannot handle more than 1500 bytes datagrams */ |
374458b3 DT |
96 | if (cfpkt_getlen(pkt) > DGM_MTU) { |
97 | cfpkt_destroy(pkt); | |
2aa40aef | 98 | return -EMSGSIZE; |
374458b3 | 99 | } |
2aa40aef | 100 | |
4a9f65f6 SB |
101 | cfpkt_add_head(pkt, &zero, 3); |
102 | packet_type = 0x08; /* B9 set - UNCLASSIFIED */ | |
103 | cfpkt_add_head(pkt, &packet_type, 1); | |
b482cd20 SB |
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; | |
4dd820c0 | 113 | return layr->dn->transmit(layr->dn, pkt); |
b482cd20 | 114 | } |