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Thomas Gleixneraf873fc2019-05-28 09:57:21 -07001// SPDX-License-Identifier: GPL-2.0-only
Sjur Braendelandb482cd22010-03-30 13:56:23 +00002/*
3 * Copyright (C) ST-Ericsson AB 2010
sjur.brandeland@stericsson.com26ee65e2013-04-22 23:57:01 +00004 * Author: Sjur Brendeland
Sjur Braendelandb482cd22010-03-30 13:56:23 +00005 */
6
Joe Perchesb31fa5b2010-09-05 21:31:11 +00007#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
8
Sjur Braendelandb482cd22010-03-30 13:56:23 +00009#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
Sjur Brændeland4a9f65f2011-04-11 10:11:30 +000016
Sjur Braendelandb482cd22010-03-30 13:56:23 +000017#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
Sjur Braendeland2aa40ae2010-06-17 06:55:40 +000022#define DGM_MTU 1500
Sjur Braendelandb482cd22010-03-30 13:56:23 +000023
24static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt);
25static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt);
26
27struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info)
28{
Joe Perches7ac2ed02011-08-25 13:22:24 +000029 struct cfsrvl *dgm = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
30 if (!dgm)
Sjur Braendelandb482cd22010-03-30 13:56:23 +000031 return NULL;
Sjur Braendelandb482cd22010-03-30 13:56:23 +000032 caif_assert(offsetof(struct cfsrvl, layer) == 0);
Sjur Braendelandb1c74242010-06-17 06:55:38 +000033 cfsrvl_init(dgm, channel_id, dev_info, true);
Sjur Braendelandb482cd22010-03-30 13:56:23 +000034 dgm->layer.receive = cfdgml_receive;
35 dgm->layer.transmit = cfdgml_transmit;
swkhack34dcf6a2019-05-17 15:59:22 +080036 snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ, "dgm%d", channel_id);
Sjur Braendelandb482cd22010-03-30 13:56:23 +000037 return &dgm->layer;
38}
39
40static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt)
41{
42 u8 cmd = -1;
43 u8 dgmhdr[3];
44 int ret;
45 caif_assert(layr->up != NULL);
46 caif_assert(layr->receive != NULL);
47 caif_assert(layr->ctrlcmd != NULL);
48
49 if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
Joe Perchesb31fa5b2010-09-05 21:31:11 +000050 pr_err("Packet is erroneous!\n");
Sjur Braendelandb482cd22010-03-30 13:56:23 +000051 cfpkt_destroy(pkt);
52 return -EPROTO;
53 }
54
55 if ((cmd & DGM_CMD_BIT) == 0) {
56 if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) {
Joe Perchesb31fa5b2010-09-05 21:31:11 +000057 pr_err("Packet is erroneous!\n");
Sjur Braendelandb482cd22010-03-30 13:56:23 +000058 cfpkt_destroy(pkt);
59 return -EPROTO;
60 }
61 ret = layr->up->receive(layr->up, pkt);
62 return ret;
63 }
64
65 switch (cmd) {
66 case DGM_FLOW_OFF: /* FLOW OFF */
67 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
68 cfpkt_destroy(pkt);
69 return 0;
70 case DGM_FLOW_ON: /* FLOW ON */
71 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
72 cfpkt_destroy(pkt);
73 return 0;
74 default:
75 cfpkt_destroy(pkt);
Joe Perchesb31fa5b2010-09-05 21:31:11 +000076 pr_info("Unknown datagram control %d (0x%x)\n", cmd, cmd);
Sjur Braendelandb482cd22010-03-30 13:56:23 +000077 return -EPROTO;
78 }
79}
80
81static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
82{
Sjur Brændeland4a9f65f2011-04-11 10:11:30 +000083 u8 packet_type;
Sjur Braendelandb482cd22010-03-30 13:56:23 +000084 u32 zero = 0;
85 struct caif_payload_info *info;
86 struct cfsrvl *service = container_obj(layr);
87 int ret;
Dmitry Tarnyagin374458b2012-03-11 10:28:31 +000088
89 if (!cfsrvl_ready(service, &ret)) {
90 cfpkt_destroy(pkt);
Sjur Braendelandb482cd22010-03-30 13:56:23 +000091 return ret;
Dmitry Tarnyagin374458b2012-03-11 10:28:31 +000092 }
Sjur Braendelandb482cd22010-03-30 13:56:23 +000093
Sjur Braendeland2aa40ae2010-06-17 06:55:40 +000094 /* STE Modem cannot handle more than 1500 bytes datagrams */
Dmitry Tarnyagin374458b2012-03-11 10:28:31 +000095 if (cfpkt_getlen(pkt) > DGM_MTU) {
96 cfpkt_destroy(pkt);
Sjur Braendeland2aa40ae2010-06-17 06:55:40 +000097 return -EMSGSIZE;
Dmitry Tarnyagin374458b2012-03-11 10:28:31 +000098 }
Sjur Braendeland2aa40ae2010-06-17 06:55:40 +000099
Sjur Brændeland4a9f65f2011-04-11 10:11:30 +0000100 cfpkt_add_head(pkt, &zero, 3);
101 packet_type = 0x08; /* B9 set - UNCLASSIFIED */
102 cfpkt_add_head(pkt, &packet_type, 1);
Sjur Braendelandb482cd22010-03-30 13:56:23 +0000103
104 /* Add info for MUX-layer to route the packet out. */
105 info = cfpkt_info(pkt);
106 info->channel_id = service->layer.id;
107 /* To optimize alignment, we add up the size of CAIF header
108 * before payload.
109 */
110 info->hdr_len = 4;
111 info->dev_info = &service->dev_info;
Sjur Brændeland4dd820c2011-04-11 10:43:51 +0000112 return layr->dn->transmit(layr->dn, pkt);
Sjur Braendelandb482cd22010-03-30 13:56:23 +0000113}