[linux-2.6-block.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_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
2aa40aef	21	#define DGM_MTU 1500
b482cd20 SB	22
	23	static int cfdgml_receive(struct cflayer layr, struct cfpkt pkt);
	24	static int cfdgml_transmit(struct cflayer layr, struct cfpkt pkt);
	25
	26	struct cflayer cfdgml_create(u8 channel_id, struct dev_info dev_info)
	27	{
	28	struct cfsrvl *dgm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
	29	if (!dgm) {
b31fa5ba	30	pr_warn("Out of memory\n");
b482cd20 SB	31	return NULL;
	32	}
	33	caif_assert(offsetof(struct cfsrvl, layer) == 0);
	34	memset(dgm, 0, sizeof(struct cfsrvl));
b1c74247	35	cfsrvl_init(dgm, channel_id, dev_info, true);
b482cd20 SB	36	dgm->layer.receive = cfdgml_receive;
	37	dgm->layer.transmit = cfdgml_transmit;
	38	snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id);
	39	dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0';
	40	return &dgm->layer;
	41	}
	42
	43	static int cfdgml_receive(struct cflayer layr, struct cfpkt pkt)
	44	{
	45	u8 cmd = -1;
	46	u8 dgmhdr[3];
	47	int ret;
	48	caif_assert(layr->up != NULL);
	49	caif_assert(layr->receive != NULL);
	50	caif_assert(layr->ctrlcmd != NULL);
	51
	52	if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
b31fa5ba	53	pr_err("Packet is erroneous!\n");
b482cd20 SB	54	cfpkt_destroy(pkt);
	55	return -EPROTO;
	56	}
	57
	58	if ((cmd & DGM_CMD_BIT) == 0) {
	59	if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) {
b31fa5ba	60	pr_err("Packet is erroneous!\n");
b482cd20 SB	61	cfpkt_destroy(pkt);
	62	return -EPROTO;
	63	}
	64	ret = layr->up->receive(layr->up, pkt);
	65	return ret;
	66	}
	67
	68	switch (cmd) {
	69	case DGM_FLOW_OFF: /* FLOW OFF */
	70	layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
	71	cfpkt_destroy(pkt);
	72	return 0;
	73	case DGM_FLOW_ON: /* FLOW ON */
	74	layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
	75	cfpkt_destroy(pkt);
	76	return 0;
	77	default:
	78	cfpkt_destroy(pkt);
b31fa5ba	79	pr_info("Unknown datagram control %d (0x%x)\n", cmd, cmd);
b482cd20 SB	80	return -EPROTO;
	81	}
	82	}
	83
	84	static int cfdgml_transmit(struct cflayer layr, struct cfpkt pkt)
	85	{
	86	u32 zero = 0;
	87	struct caif_payload_info *info;
	88	struct cfsrvl *service = container_obj(layr);
	89	int ret;
	90	if (!cfsrvl_ready(service, &ret))
	91	return ret;
	92
2aa40aef SB	93	/* STE Modem cannot handle more than 1500 bytes datagrams */
	94	if (cfpkt_getlen(pkt) > DGM_MTU)
	95	return -EMSGSIZE;
	96
b482cd20 SB	97	cfpkt_add_head(pkt, &zero, 4);
	98
	99	/* Add info for MUX-layer to route the packet out. */
	100	info = cfpkt_info(pkt);
	101	info->channel_id = service->layer.id;
	102	/* To optimize alignment, we add up the size of CAIF header
	103	* before payload.
	104	*/
	105	info->hdr_len = 4;
	106	info->dev_info = &service->dev_info;
	107	ret = layr->dn->transmit(layr->dn, pkt);
	108	if (ret < 0) {
	109	u32 tmp32;
	110	cfpkt_extr_head(pkt, &tmp32, 4);
	111	}
	112	return ret;
	113	}