Correct .gbs.conf settings
[platform/adaptation/renesas_rcar/renesas_kernel.git] / net / caif / cfdgml.c
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 }