114 строки
2.9 KiB
C
114 строки
2.9 KiB
C
/*
|
|
* Copyright (C) ST-Ericsson AB 2010
|
|
* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
|
|
* License terms: GNU General Public License (GPL) version 2
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
|
|
|
|
#include <linux/stddef.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/slab.h>
|
|
#include <net/caif/caif_layer.h>
|
|
#include <net/caif/cfsrvl.h>
|
|
#include <net/caif/cfpkt.h>
|
|
|
|
#define container_obj(layr) ((struct cfsrvl *) layr)
|
|
|
|
#define DGM_CMD_BIT 0x80
|
|
#define DGM_FLOW_OFF 0x81
|
|
#define DGM_FLOW_ON 0x80
|
|
#define DGM_MTU 1500
|
|
|
|
static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt);
|
|
static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt);
|
|
|
|
struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info)
|
|
{
|
|
struct cfsrvl *dgm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
|
|
if (!dgm) {
|
|
pr_warn("Out of memory\n");
|
|
return NULL;
|
|
}
|
|
caif_assert(offsetof(struct cfsrvl, layer) == 0);
|
|
memset(dgm, 0, sizeof(struct cfsrvl));
|
|
cfsrvl_init(dgm, channel_id, dev_info, true);
|
|
dgm->layer.receive = cfdgml_receive;
|
|
dgm->layer.transmit = cfdgml_transmit;
|
|
snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id);
|
|
dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0';
|
|
return &dgm->layer;
|
|
}
|
|
|
|
static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt)
|
|
{
|
|
u8 cmd = -1;
|
|
u8 dgmhdr[3];
|
|
int ret;
|
|
caif_assert(layr->up != NULL);
|
|
caif_assert(layr->receive != NULL);
|
|
caif_assert(layr->ctrlcmd != NULL);
|
|
|
|
if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
|
|
pr_err("Packet is erroneous!\n");
|
|
cfpkt_destroy(pkt);
|
|
return -EPROTO;
|
|
}
|
|
|
|
if ((cmd & DGM_CMD_BIT) == 0) {
|
|
if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) {
|
|
pr_err("Packet is erroneous!\n");
|
|
cfpkt_destroy(pkt);
|
|
return -EPROTO;
|
|
}
|
|
ret = layr->up->receive(layr->up, pkt);
|
|
return ret;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case DGM_FLOW_OFF: /* FLOW OFF */
|
|
layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
|
|
cfpkt_destroy(pkt);
|
|
return 0;
|
|
case DGM_FLOW_ON: /* FLOW ON */
|
|
layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
|
|
cfpkt_destroy(pkt);
|
|
return 0;
|
|
default:
|
|
cfpkt_destroy(pkt);
|
|
pr_info("Unknown datagram control %d (0x%x)\n", cmd, cmd);
|
|
return -EPROTO;
|
|
}
|
|
}
|
|
|
|
static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
|
|
{
|
|
u32 zero = 0;
|
|
struct caif_payload_info *info;
|
|
struct cfsrvl *service = container_obj(layr);
|
|
int ret;
|
|
if (!cfsrvl_ready(service, &ret))
|
|
return ret;
|
|
|
|
/* STE Modem cannot handle more than 1500 bytes datagrams */
|
|
if (cfpkt_getlen(pkt) > DGM_MTU)
|
|
return -EMSGSIZE;
|
|
|
|
cfpkt_add_head(pkt, &zero, 4);
|
|
|
|
/* Add info for MUX-layer to route the packet out. */
|
|
info = cfpkt_info(pkt);
|
|
info->channel_id = service->layer.id;
|
|
/* To optimize alignment, we add up the size of CAIF header
|
|
* before payload.
|
|
*/
|
|
info->hdr_len = 4;
|
|
info->dev_info = &service->dev_info;
|
|
ret = layr->dn->transmit(layr->dn, pkt);
|
|
if (ret < 0) {
|
|
u32 tmp32;
|
|
cfpkt_extr_head(pkt, &tmp32, 4);
|
|
}
|
|
return ret;
|
|
}
|