[net-next-2.6.git] / net / caif / cfdgml.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_CTRL_PKT_SIZE 1
#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;
}
Commit	Line	Data
b482cd20 SB	1	/*
	2	* Copyright (C) ST-Ericsson AB 2010
	3	* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
	4	* License terms: GNU General Public License (GPL) version 2
	5	*/
	6
b31fa5ba JP	7	#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
b31fa5ba JP	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
	16	#define container_obj(layr) ((struct cfsrvl *) layr)
	17
	18	#define DGM_CMD_BIT 0x80
	19	#define DGM_FLOW_OFF 0x81
	20	#define DGM_FLOW_ON 0x80
	21	#define DGM_CTRL_PKT_SIZE 1
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	{
	29	struct cfsrvl *dgm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
	30	if (!dgm) {
b31fa5ba	31	pr_warn("Out of memory\n");
b482cd20 SB	32	return NULL;
	33	}
	34	caif_assert(offsetof(struct cfsrvl, layer) == 0);
	35	memset(dgm, 0, sizeof(struct cfsrvl));
b1c74247	36	cfsrvl_init(dgm, channel_id, dev_info, true);
b482cd20 SB	37	dgm->layer.receive = cfdgml_receive;
	38	dgm->layer.transmit = cfdgml_transmit;
	39	snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id);
	40	dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0';
	41	return &dgm->layer;
	42	}
	43
	44	static int cfdgml_receive(struct cflayer layr, struct cfpkt pkt)
	45	{
	46	u8 cmd = -1;
	47	u8 dgmhdr[3];
	48	int ret;
	49	caif_assert(layr->up != NULL);
	50	caif_assert(layr->receive != NULL);
	51	caif_assert(layr->ctrlcmd != NULL);
	52
	53	if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
b31fa5ba	54	pr_err("Packet is erroneous!\n");
b482cd20 SB	55	cfpkt_destroy(pkt);
	56	return -EPROTO;
	57	}
	58
	59	if ((cmd & DGM_CMD_BIT) == 0) {
	60	if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) {
b31fa5ba	61	pr_err("Packet is erroneous!\n");
b482cd20 SB	62	cfpkt_destroy(pkt);
	63	return -EPROTO;
	64	}
	65	ret = layr->up->receive(layr->up, pkt);
	66	return ret;
	67	}
	68
	69	switch (cmd) {
	70	case DGM_FLOW_OFF: /* FLOW OFF */
	71	layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
	72	cfpkt_destroy(pkt);
	73	return 0;
	74	case DGM_FLOW_ON: /* FLOW ON */
	75	layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
	76	cfpkt_destroy(pkt);
	77	return 0;
	78	default:
	79	cfpkt_destroy(pkt);
b31fa5ba	80	pr_info("Unknown datagram control %d (0x%x)\n", cmd, cmd);
b482cd20 SB	81	return -EPROTO;
	82	}
	83	}
	84
	85	static int cfdgml_transmit(struct cflayer layr, struct cfpkt pkt)
	86	{
	87	u32 zero = 0;
	88	struct caif_payload_info *info;
	89	struct cfsrvl *service = container_obj(layr);
	90	int ret;
	91	if (!cfsrvl_ready(service, &ret))
	92	return ret;
	93
2aa40aef SB	94	/* STE Modem cannot handle more than 1500 bytes datagrams */
	95	if (cfpkt_getlen(pkt) > DGM_MTU)
	96	return -EMSGSIZE;
	97
b482cd20 SB	98	cfpkt_add_head(pkt, &zero, 4);
	99
	100	/* Add info for MUX-layer to route the packet out. */
	101	info = cfpkt_info(pkt);
	102	info->channel_id = service->layer.id;
	103	/* To optimize alignment, we add up the size of CAIF header
	104	* before payload.
	105	*/
	106	info->hdr_len = 4;
	107	info->dev_info = &service->dev_info;
	108	ret = layr->dn->transmit(layr->dn, pkt);
	109	if (ret < 0) {
	110	u32 tmp32;
	111	cfpkt_extr_head(pkt, &tmp32, 4);
	112	}
	113	return ret;
	114	}