[linux-2.6-block.git] / net / caif / cfcnfg.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/kernel.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/module.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cfcnfg.h>
#include <net/caif/cfctrl.h>
#include <net/caif/cfmuxl.h>
#include <net/caif/cffrml.h>
#include <net/caif/cfserl.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/caif_dev.h>

#define container_obj(layr) container_of(layr, struct cfcnfg, layer)

/* Information about CAIF physical interfaces held by Config Module in order
 * to manage physical interfaces
 */
struct cfcnfg_phyinfo {
	struct list_head node;
	bool up;

	/* Pointer to the layer below the MUX (framing layer) */
	struct cflayer *frm_layer;
	/* Pointer to the lowest actual physical layer */
	struct cflayer *phy_layer;
	/* Unique identifier of the physical interface */
	unsigned int id;
	/* Preference of the physical in interface */
	enum cfcnfg_phy_preference pref;

	/* Information about the physical device */
	struct dev_info dev_info;

	/* Interface index */
	int ifindex;

	/* Use Start of frame extension */
	bool use_stx;

	/* Use Start of frame checksum */
	bool use_fcs;
};

struct cfcnfg {
	struct cflayer layer;
	struct cflayer *ctrl;
	struct cflayer *mux;
	struct list_head phys;
	struct mutex lock;
};

static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id,
			     enum cfctrl_srv serv, u8 phyid,
			     struct cflayer *adapt_layer);
static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id);
static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
			     struct cflayer *adapt_layer);
static void cfctrl_resp_func(void);
static void cfctrl_enum_resp(void);

struct cfcnfg *cfcnfg_create(void)
{
	struct cfcnfg *this;
	struct cfctrl_rsp *resp;

	might_sleep();

	/* Initiate this layer */
	this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
	if (!this) {
		pr_warn("Out of memory\n");
		return NULL;
	}
	this->mux = cfmuxl_create();
	if (!this->mux)
		goto out_of_mem;
	this->ctrl = cfctrl_create();
	if (!this->ctrl)
		goto out_of_mem;
	/* Initiate response functions */
	resp = cfctrl_get_respfuncs(this->ctrl);
	resp->enum_rsp = cfctrl_enum_resp;
	resp->linkerror_ind = cfctrl_resp_func;
	resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp;
	resp->sleep_rsp = cfctrl_resp_func;
	resp->wake_rsp = cfctrl_resp_func;
	resp->restart_rsp = cfctrl_resp_func;
	resp->radioset_rsp = cfctrl_resp_func;
	resp->linksetup_rsp = cfcnfg_linkup_rsp;
	resp->reject_rsp = cfcnfg_reject_rsp;
	INIT_LIST_HEAD(&this->phys);

	cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
	layer_set_dn(this->ctrl, this->mux);
	layer_set_up(this->ctrl, this);
	mutex_init(&this->lock);

	return this;
out_of_mem:
	pr_warn("Out of memory\n");

	synchronize_rcu();

	kfree(this->mux);
	kfree(this->ctrl);
	kfree(this);
	return NULL;
}

void cfcnfg_remove(struct cfcnfg *cfg)
{
	might_sleep();
	if (cfg) {
		synchronize_rcu();

		kfree(cfg->mux);
		cfctrl_remove(cfg->ctrl);
		kfree(cfg);
	}
}

static void cfctrl_resp_func(void)
{
}

static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo_rcu(struct cfcnfg *cnfg,
							u8 phyid)
{
	struct cfcnfg_phyinfo *phy;

	list_for_each_entry_rcu(phy, &cnfg->phys, node)
		if (phy->id == phyid)
			return phy;
	return NULL;
}

static void cfctrl_enum_resp(void)
{
}

static struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
				  enum cfcnfg_phy_preference phy_pref)
{
	/* Try to match with specified preference */
	struct cfcnfg_phyinfo *phy;

	list_for_each_entry_rcu(phy, &cnfg->phys, node) {
		if (phy->up && phy->pref == phy_pref &&
				phy->frm_layer != NULL)

			return &phy->dev_info;
	}

	/* Otherwise just return something */
	list_for_each_entry_rcu(phy, &cnfg->phys, node)
		if (phy->up)
			return &phy->dev_info;

	return NULL;
}

static int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi)
{
	struct cfcnfg_phyinfo *phy;

	list_for_each_entry_rcu(phy, &cnfg->phys, node)
		if (phy->ifindex == ifi && phy->up)
			return phy->id;
	return -ENODEV;
}

int caif_disconnect_client(struct net *net, struct cflayer *adap_layer)
{
	u8 channel_id = 0;
	int ret = 0;
	struct cflayer *servl = NULL;
	struct cfcnfg *cfg = get_cfcnfg(net);

	caif_assert(adap_layer != NULL);

	channel_id = adap_layer->id;
	if (adap_layer->dn == NULL || channel_id == 0) {
		pr_err("adap_layer->dn == NULL or adap_layer->id is 0\n");
		ret = -ENOTCONN;
		goto end;
	}

	servl = cfmuxl_remove_uplayer(cfg->mux, channel_id);
	if (servl == NULL) {
		pr_err("PROTOCOL ERROR - "
				"Error removing service_layer Channel_Id(%d)",
				channel_id);
		ret = -EINVAL;
		goto end;
	}

	ret = cfctrl_linkdown_req(cfg->ctrl, channel_id, adap_layer);

end:
	cfctrl_cancel_req(cfg->ctrl, adap_layer);

	/* Do RCU sync before initiating cleanup */
	synchronize_rcu();
	if (adap_layer->ctrlcmd != NULL)
		adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0);
	return ret;

}
EXPORT_SYMBOL(caif_disconnect_client);

static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
{
}

static const int protohead[CFCTRL_SRV_MASK] = {
	[CFCTRL_SRV_VEI] = 4,
	[CFCTRL_SRV_DATAGRAM] = 7,
	[CFCTRL_SRV_UTIL] = 4,
	[CFCTRL_SRV_RFM] = 3,
	[CFCTRL_SRV_DBG] = 3,
};


static int caif_connect_req_to_link_param(struct cfcnfg *cnfg,
				   struct caif_connect_request *s,
				   struct cfctrl_link_param *l)
{
	struct dev_info *dev_info;
	enum cfcnfg_phy_preference pref;
	int res;

	memset(l, 0, sizeof(*l));
	/* In caif protocol low value is high priority */
	l->priority = CAIF_PRIO_MAX - s->priority + 1;

	if (s->ifindex != 0) {
		res = cfcnfg_get_id_from_ifi(cnfg, s->ifindex);
		if (res < 0)
			return res;
		l->phyid = res;
	} else {
		switch (s->link_selector) {
		case CAIF_LINK_HIGH_BANDW:
			pref = CFPHYPREF_HIGH_BW;
			break;
		case CAIF_LINK_LOW_LATENCY:
			pref = CFPHYPREF_LOW_LAT;
			break;
		default:
			return -EINVAL;
		}
		dev_info = cfcnfg_get_phyid(cnfg, pref);
		if (dev_info == NULL)
			return -ENODEV;
		l->phyid = dev_info->id;
	}
	switch (s->protocol) {
	case CAIFPROTO_AT:
		l->linktype = CFCTRL_SRV_VEI;
		l->endpoint = (s->sockaddr.u.at.type >> 2) & 0x3;
		l->chtype = s->sockaddr.u.at.type & 0x3;
		break;
	case CAIFPROTO_DATAGRAM:
		l->linktype = CFCTRL_SRV_DATAGRAM;
		l->chtype = 0x00;
		l->u.datagram.connid = s->sockaddr.u.dgm.connection_id;
		break;
	case CAIFPROTO_DATAGRAM_LOOP:
		l->linktype = CFCTRL_SRV_DATAGRAM;
		l->chtype = 0x03;
		l->endpoint = 0x00;
		l->u.datagram.connid = s->sockaddr.u.dgm.connection_id;
		break;
	case CAIFPROTO_RFM:
		l->linktype = CFCTRL_SRV_RFM;
		l->u.datagram.connid = s->sockaddr.u.rfm.connection_id;
		strncpy(l->u.rfm.volume, s->sockaddr.u.rfm.volume,
			sizeof(l->u.rfm.volume)-1);
		l->u.rfm.volume[sizeof(l->u.rfm.volume)-1] = 0;
		break;
	case CAIFPROTO_UTIL:
		l->linktype = CFCTRL_SRV_UTIL;
		l->endpoint = 0x00;
		l->chtype = 0x00;
		strncpy(l->u.utility.name, s->sockaddr.u.util.service,
			sizeof(l->u.utility.name)-1);
		l->u.utility.name[sizeof(l->u.utility.name)-1] = 0;
		caif_assert(sizeof(l->u.utility.name) > 10);
		l->u.utility.paramlen = s->param.size;
		if (l->u.utility.paramlen > sizeof(l->u.utility.params))
			l->u.utility.paramlen = sizeof(l->u.utility.params);

		memcpy(l->u.utility.params, s->param.data,
		       l->u.utility.paramlen);

		break;
	case CAIFPROTO_DEBUG:
		l->linktype = CFCTRL_SRV_DBG;
		l->endpoint = s->sockaddr.u.dbg.service;
		l->chtype = s->sockaddr.u.dbg.type;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

int caif_connect_client(struct net *net, struct caif_connect_request *conn_req,
			struct cflayer *adap_layer, int *ifindex,
				int *proto_head,
				int *proto_tail)
{
	struct cflayer *frml;
	struct cfcnfg_phyinfo *phy;
	int err;
	struct cfctrl_link_param param;
	struct cfcnfg *cfg = get_cfcnfg(net);
	caif_assert(cfg != NULL);

	rcu_read_lock();
	err = caif_connect_req_to_link_param(cfg, conn_req, &param);
	if (err)
		goto unlock;

	phy = cfcnfg_get_phyinfo_rcu(cfg, param.phyid);
	if (!phy) {
		err = -ENODEV;
		goto unlock;
	}
	err = -EINVAL;

	if (adap_layer == NULL) {
		pr_err("adap_layer is zero\n");
		goto unlock;
	}
	if (adap_layer->receive == NULL) {
		pr_err("adap_layer->receive is NULL\n");
		goto unlock;
	}
	if (adap_layer->ctrlcmd == NULL) {
		pr_err("adap_layer->ctrlcmd == NULL\n");
		goto unlock;
	}

	err = -ENODEV;
	frml = phy->frm_layer;
	if (frml == NULL) {
		pr_err("Specified PHY type does not exist!\n");
		goto unlock;
	}
	caif_assert(param.phyid == phy->id);
	caif_assert(phy->frm_layer->id ==
		     param.phyid);
	caif_assert(phy->phy_layer->id ==
		     param.phyid);

	*ifindex = phy->ifindex;
	*proto_tail = 2;
	*proto_head =

	protohead[param.linktype] + (phy->use_stx ? 1 : 0);

	rcu_read_unlock();

	/* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
	cfctrl_enum_req(cfg->ctrl, param.phyid);
	return cfctrl_linkup_request(cfg->ctrl, &param, adap_layer);

unlock:
	rcu_read_unlock();
	return err;
}
EXPORT_SYMBOL(caif_connect_client);

static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
			     struct cflayer *adapt_layer)
{
	if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
		adapt_layer->ctrlcmd(adapt_layer,
				     CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
}

static void
cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
		  u8 phyid, struct cflayer *adapt_layer)
{
	struct cfcnfg *cnfg = container_obj(layer);
	struct cflayer *servicel = NULL;
	struct cfcnfg_phyinfo *phyinfo;
	struct net_device *netdev;

	rcu_read_lock();

	if (adapt_layer == NULL) {
		pr_debug("link setup response but no client exist,"
				"send linkdown back\n");
		cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL);
		goto unlock;
	}

	caif_assert(cnfg != NULL);
	caif_assert(phyid != 0);

	phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid);
	if (phyinfo == NULL) {
		pr_err("ERROR: Link Layer Device dissapeared"
				"while connecting\n");
		goto unlock;
	}

	caif_assert(phyinfo != NULL);
	caif_assert(phyinfo->id == phyid);
	caif_assert(phyinfo->phy_layer != NULL);
	caif_assert(phyinfo->phy_layer->id == phyid);

	adapt_layer->id = channel_id;

	switch (serv) {
	case CFCTRL_SRV_VEI:
		servicel = cfvei_create(channel_id, &phyinfo->dev_info);
		break;
	case CFCTRL_SRV_DATAGRAM:
		servicel = cfdgml_create(channel_id,
					&phyinfo->dev_info);
		break;
	case CFCTRL_SRV_RFM:
		netdev = phyinfo->dev_info.dev;
		servicel = cfrfml_create(channel_id, &phyinfo->dev_info,
						netdev->mtu);
		break;
	case CFCTRL_SRV_UTIL:
		servicel = cfutill_create(channel_id, &phyinfo->dev_info);
		break;
	case CFCTRL_SRV_VIDEO:
		servicel = cfvidl_create(channel_id, &phyinfo->dev_info);
		break;
	case CFCTRL_SRV_DBG:
		servicel = cfdbgl_create(channel_id, &phyinfo->dev_info);
		break;
	default:
		pr_err("Protocol error. Link setup response "
				"- unknown channel type\n");
		goto unlock;
	}
	if (!servicel) {
		pr_warn("Out of memory\n");
		goto unlock;
	}
	layer_set_dn(servicel, cnfg->mux);
	cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id);
	layer_set_up(servicel, adapt_layer);
	layer_set_dn(adapt_layer, servicel);

	rcu_read_unlock();

	servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
	return;
unlock:
	rcu_read_unlock();
}

void
cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
		     struct net_device *dev, struct cflayer *phy_layer,
		     enum cfcnfg_phy_preference pref,
		     bool fcs, bool stx)
{
	struct cflayer *frml;
	struct cflayer *phy_driver = NULL;
	struct cfcnfg_phyinfo *phyinfo;
	int i;
	u8 phyid;

	mutex_lock(&cnfg->lock);

	/* CAIF protocol allow maximum 6 link-layers */
	for (i = 0; i < 7; i++) {
		phyid = (dev->ifindex + i) & 0x7;
		if (phyid == 0)
			continue;
		if (cfcnfg_get_phyinfo_rcu(cnfg, phyid) == NULL)
			goto got_phyid;
	}
	pr_warn("Too many CAIF Link Layers (max 6)\n");
	goto out;

got_phyid:
	phyinfo = kzalloc(sizeof(struct cfcnfg_phyinfo), GFP_ATOMIC);

	switch (phy_type) {
	case CFPHYTYPE_FRAG:
		phy_driver =
		    cfserl_create(CFPHYTYPE_FRAG, phyid, stx);
		if (!phy_driver) {
			pr_warn("Out of memory\n");
			goto out;
		}
		break;
	case CFPHYTYPE_CAIF:
		phy_driver = NULL;
		break;
	default:
		goto out;
	}
	phy_layer->id = phyid;
	phyinfo->pref = pref;
	phyinfo->id = phyid;
	phyinfo->dev_info.id = phyid;
	phyinfo->dev_info.dev = dev;
	phyinfo->phy_layer = phy_layer;
	phyinfo->ifindex = dev->ifindex;
	phyinfo->use_stx = stx;
	phyinfo->use_fcs = fcs;

	phy_layer->type = phy_type;
	frml = cffrml_create(phyid, fcs);

	if (!frml) {
		pr_warn("Out of memory\n");
		kfree(phyinfo);
		goto out;
	}
	phyinfo->frm_layer = frml;
	layer_set_up(frml, cnfg->mux);

	if (phy_driver != NULL) {
		phy_driver->id = phyid;
		layer_set_dn(frml, phy_driver);
		layer_set_up(phy_driver, frml);
		layer_set_dn(phy_driver, phy_layer);
		layer_set_up(phy_layer, phy_driver);
	} else {
		layer_set_dn(frml, phy_layer);
		layer_set_up(phy_layer, frml);
	}

	list_add_rcu(&phyinfo->node, &cnfg->phys);
out:
	mutex_unlock(&cnfg->lock);
}
EXPORT_SYMBOL(cfcnfg_add_phy_layer);

int cfcnfg_set_phy_state(struct cfcnfg *cnfg, struct cflayer *phy_layer,
		bool up)
{
	struct cfcnfg_phyinfo *phyinfo;

	rcu_read_lock();
	phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phy_layer->id);
	if (phyinfo == NULL) {
		rcu_read_unlock();
		return -ENODEV;
	}

	if (phyinfo->up == up) {
		rcu_read_unlock();
		return 0;
	}
	phyinfo->up = up;

	if (up) {
		cffrml_hold(phyinfo->frm_layer);
		cfmuxl_set_dnlayer(cnfg->mux, phyinfo->frm_layer,
					phy_layer->id);
	} else {
		cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
		cffrml_put(phyinfo->frm_layer);
	}

	rcu_read_unlock();
	return 0;
}
EXPORT_SYMBOL(cfcnfg_set_phy_state);

int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
{
	struct cflayer *frml, *frml_dn;
	u16 phyid;
	struct cfcnfg_phyinfo *phyinfo;

	might_sleep();

	mutex_lock(&cnfg->lock);

	phyid = phy_layer->id;
	phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid);

	if (phyinfo == NULL) {
		mutex_unlock(&cnfg->lock);
		return 0;
	}
	caif_assert(phyid == phyinfo->id);
	caif_assert(phy_layer == phyinfo->phy_layer);
	caif_assert(phy_layer->id == phyid);
	caif_assert(phyinfo->frm_layer->id == phyid);

	list_del_rcu(&phyinfo->node);
	synchronize_rcu();

	/* Fail if reference count is not zero */
	if (cffrml_refcnt_read(phyinfo->frm_layer) != 0) {
		pr_info("Wait for device inuse\n");
		list_add_rcu(&phyinfo->node, &cnfg->phys);
		mutex_unlock(&cnfg->lock);
		return -EAGAIN;
	}

	frml = phyinfo->frm_layer;
	frml_dn = frml->dn;
	cffrml_set_uplayer(frml, NULL);
	cffrml_set_dnlayer(frml, NULL);
	if (phy_layer != frml_dn) {
		layer_set_up(frml_dn, NULL);
		layer_set_dn(frml_dn, NULL);
	}
	layer_set_up(phy_layer, NULL);

	if (phyinfo->phy_layer != frml_dn)
		kfree(frml_dn);

	cffrml_free(frml);
	kfree(phyinfo);
	mutex_unlock(&cnfg->lock);

	return 0;
}
EXPORT_SYMBOL(cfcnfg_del_phy_layer);
Commit	Line	Data
15c9ac0c 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	*/
b31fa5ba JP	6
	7	#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
	8
15c9ac0c SB	9	#include <linux/kernel.h>
15c9ac0c SB	10	#include <linux/stddef.h>
6c579906	11	#include <linux/slab.h>
2aa40aef	12	#include <linux/netdevice.h>
f3621440	13	#include <linux/module.h>
15c9ac0c SB	14	#include <net/caif/caif_layer.h>
	15	#include <net/caif/cfpkt.h>
	16	#include <net/caif/cfcnfg.h>
	17	#include <net/caif/cfctrl.h>
	18	#include <net/caif/cfmuxl.h>
	19	#include <net/caif/cffrml.h>
	20	#include <net/caif/cfserl.h>
	21	#include <net/caif/cfsrvl.h>
f3621440	22	#include <net/caif/caif_dev.h>
15c9ac0c SB	23
	24	#define container_obj(layr) container_of(layr, struct cfcnfg, layer)
	25
	26	/* Information about CAIF physical interfaces held by Config Module in order
	27	* to manage physical interfaces
	28	*/
	29	struct cfcnfg_phyinfo {
f3621440	30	struct list_head node;
	31	bool up;
	32
15c9ac0c SB	33	/* Pointer to the layer below the MUX (framing layer) */
	34	struct cflayer *frm_layer;
	35	/* Pointer to the lowest actual physical layer */
	36	struct cflayer *phy_layer;
	37	/* Unique identifier of the physical interface */
	38	unsigned int id;
	39	/* Preference of the physical in interface */
	40	enum cfcnfg_phy_preference pref;
	41
15c9ac0c SB	42	/* Information about the physical device */
15c9ac0c SB	43	struct dev_info dev_info;
2aa40aef SB	44
	45	/* Interface index */
	46	int ifindex;
	47
	48	/* Use Start of frame extension */
	49	bool use_stx;
	50
	51	/* Use Start of frame checksum */
	52	bool use_fcs;
15c9ac0c SB	53	};
	54
	55	struct cfcnfg {
	56	struct cflayer layer;
	57	struct cflayer *ctrl;
	58	struct cflayer *mux;
f3621440	59	struct list_head phys;
f3621440	60	struct mutex lock;
15c9ac0c SB	61	};
15c9ac0c SB	62
e539d83c	63	static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id,
15c9ac0c SB	64	enum cfctrl_srv serv, u8 phyid,
15c9ac0c SB	65	struct cflayer *adapt_layer);
8d545c8f	66	static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id);
e539d83c	67	static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
15c9ac0c SB	68	struct cflayer *adapt_layer);
	69	static void cfctrl_resp_func(void);
	70	static void cfctrl_enum_resp(void);
	71
	72	struct cfcnfg *cfcnfg_create(void)
	73	{
	74	struct cfcnfg *this;
	75	struct cfctrl_rsp *resp;
f3621440	76
	77	might_sleep();
	78
15c9ac0c	79	/* Initiate this layer */
49afa55b	80	this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
15c9ac0c	81	if (!this) {
b31fa5ba	82	pr_warn("Out of memory\n");
15c9ac0c SB	83	return NULL;
15c9ac0c SB	84	}
15c9ac0c SB	85	this->mux = cfmuxl_create();
	86	if (!this->mux)
	87	goto out_of_mem;
	88	this->ctrl = cfctrl_create();
	89	if (!this->ctrl)
	90	goto out_of_mem;
	91	/* Initiate response functions */
	92	resp = cfctrl_get_respfuncs(this->ctrl);
	93	resp->enum_rsp = cfctrl_enum_resp;
	94	resp->linkerror_ind = cfctrl_resp_func;
e539d83c	95	resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp;
15c9ac0c SB	96	resp->sleep_rsp = cfctrl_resp_func;
	97	resp->wake_rsp = cfctrl_resp_func;
	98	resp->restart_rsp = cfctrl_resp_func;
	99	resp->radioset_rsp = cfctrl_resp_func;
e539d83c SB	100	resp->linksetup_rsp = cfcnfg_linkup_rsp;
e539d83c SB	101	resp->reject_rsp = cfcnfg_reject_rsp;
f3621440	102	INIT_LIST_HEAD(&this->phys);
15c9ac0c SB	103
	104	cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
	105	layer_set_dn(this->ctrl, this->mux);
	106	layer_set_up(this->ctrl, this);
f3621440	107	mutex_init(&this->lock);
f3621440	108
15c9ac0c SB	109	return this;
15c9ac0c SB	110	out_of_mem:
b31fa5ba	111	pr_warn("Out of memory\n");
f3621440	112
	113	synchronize_rcu();
	114
15c9ac0c SB	115	kfree(this->mux);
	116	kfree(this->ctrl);
	117	kfree(this);
	118	return NULL;
	119	}
15c9ac0c SB	120
	121	void cfcnfg_remove(struct cfcnfg *cfg)
	122	{
f3621440	123	might_sleep();
15c9ac0c	124	if (cfg) {
f3621440	125	synchronize_rcu();
f3621440	126
15c9ac0c	127	kfree(cfg->mux);
c85c2951	128	cfctrl_remove(cfg->ctrl);
15c9ac0c SB	129	kfree(cfg);
	130	}
	131	}
	132
	133	static void cfctrl_resp_func(void)
	134	{
	135	}
	136
f3621440	137	static struct cfcnfg_phyinfo cfcnfg_get_phyinfo_rcu(struct cfcnfg cnfg,
	138	u8 phyid)
	139	{
	140	struct cfcnfg_phyinfo *phy;
	141
	142	list_for_each_entry_rcu(phy, &cnfg->phys, node)
	143	if (phy->id == phyid)
	144	return phy;
	145	return NULL;
	146	}
	147
15c9ac0c SB	148	static void cfctrl_enum_resp(void)
	149	{
	150	}
	151
bee925db	152	static struct dev_info cfcnfg_get_phyid(struct cfcnfg cnfg,
15c9ac0c SB	153	enum cfcnfg_phy_preference phy_pref)
15c9ac0c SB	154	{
15c9ac0c	155	/* Try to match with specified preference */
f3621440	156	struct cfcnfg_phyinfo *phy;
	157
	158	list_for_each_entry_rcu(phy, &cnfg->phys, node) {
	159	if (phy->up && phy->pref == phy_pref &&
	160	phy->frm_layer != NULL)
	161
	162	return &phy->dev_info;
15c9ac0c SB	163	}
15c9ac0c SB	164
f3621440	165	/* Otherwise just return something */
	166	list_for_each_entry_rcu(phy, &cnfg->phys, node)
	167	if (phy->up)
	168	return &phy->dev_info;
15c9ac0c	169
15c9ac0c SB	170	return NULL;
	171	}
	172
bee925db	173	static int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi)
15c9ac0c	174	{
f3621440	175	struct cfcnfg_phyinfo *phy;
	176
	177	list_for_each_entry_rcu(phy, &cnfg->phys, node)
	178	if (phy->ifindex == ifi && phy->up)
	179	return phy->id;
f2527ec4	180	return -ENODEV;
15c9ac0c SB	181	}
15c9ac0c SB	182
bee925db	183	int caif_disconnect_client(struct net net, struct cflayer adap_layer)
15c9ac0c SB	184	{
	185	u8 channel_id = 0;
	186	int ret = 0;
8d545c8f	187	struct cflayer *servl = NULL;
bee925db	188	struct cfcnfg *cfg = get_cfcnfg(net);
01a85901	189
15c9ac0c	190	caif_assert(adap_layer != NULL);
f3621440	191
15c9ac0c	192	channel_id = adap_layer->id;
8d545c8f	193	if (adap_layer->dn == NULL \|\| channel_id == 0) {
b04367df	194	pr_err("adap_layer->dn == NULL or adap_layer->id is 0\n");
15c9ac0c SB	195	ret = -ENOTCONN;
	196	goto end;
	197	}
f3621440	198
f3621440	199	servl = cfmuxl_remove_uplayer(cfg->mux, channel_id);
8d545c8f	200	if (servl == NULL) {
f3621440	201	pr_err("PROTOCOL ERROR - "
	202	"Error removing service_layer Channel_Id(%d)",
	203	channel_id);
15c9ac0c SB	204	ret = -EINVAL;
	205	goto end;
	206	}
f3621440	207
	208	ret = cfctrl_linkdown_req(cfg->ctrl, channel_id, adap_layer);
	209
8d545c8f	210	end:
f3621440	211	cfctrl_cancel_req(cfg->ctrl, adap_layer);
	212
	213	/* Do RCU sync before initiating cleanup */
	214	synchronize_rcu();
8d545c8f SB	215	if (adap_layer->ctrlcmd != NULL)
8d545c8f SB	216	adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0);
15c9ac0c SB	217	return ret;
	218
	219	}
bee925db	220	EXPORT_SYMBOL(caif_disconnect_client);
5b208656	221
8d545c8f	222	static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
15c9ac0c	223	{
15c9ac0c SB	224	}
15c9ac0c SB	225
73d6ac63	226	static const int protohead[CFCTRL_SRV_MASK] = {
2aa40aef SB	227	[CFCTRL_SRV_VEI] = 4,
	228	[CFCTRL_SRV_DATAGRAM] = 7,
	229	[CFCTRL_SRV_UTIL] = 4,
	230	[CFCTRL_SRV_RFM] = 3,
	231	[CFCTRL_SRV_DBG] = 3,
	232	};
	233
bee925db	234
	235	static int caif_connect_req_to_link_param(struct cfcnfg *cnfg,
	236	struct caif_connect_request *s,
	237	struct cfctrl_link_param *l)
	238	{
	239	struct dev_info *dev_info;
	240	enum cfcnfg_phy_preference pref;
	241	int res;
	242
	243	memset(l, 0, sizeof(*l));
	244	/* In caif protocol low value is high priority */
	245	l->priority = CAIF_PRIO_MAX - s->priority + 1;
	246
	247	if (s->ifindex != 0) {
	248	res = cfcnfg_get_id_from_ifi(cnfg, s->ifindex);
	249	if (res < 0)
	250	return res;
	251	l->phyid = res;
	252	} else {
	253	switch (s->link_selector) {
	254	case CAIF_LINK_HIGH_BANDW:
	255	pref = CFPHYPREF_HIGH_BW;
	256	break;
	257	case CAIF_LINK_LOW_LATENCY:
	258	pref = CFPHYPREF_LOW_LAT;
	259	break;
	260	default:
	261	return -EINVAL;
	262	}
	263	dev_info = cfcnfg_get_phyid(cnfg, pref);
	264	if (dev_info == NULL)
	265	return -ENODEV;
	266	l->phyid = dev_info->id;
	267	}
	268	switch (s->protocol) {
	269	case CAIFPROTO_AT:
	270	l->linktype = CFCTRL_SRV_VEI;
	271	l->endpoint = (s->sockaddr.u.at.type >> 2) & 0x3;
	272	l->chtype = s->sockaddr.u.at.type & 0x3;
	273	break;
	274	case CAIFPROTO_DATAGRAM:
	275	l->linktype = CFCTRL_SRV_DATAGRAM;
	276	l->chtype = 0x00;
	277	l->u.datagram.connid = s->sockaddr.u.dgm.connection_id;
	278	break;
	279	case CAIFPROTO_DATAGRAM_LOOP:
	280	l->linktype = CFCTRL_SRV_DATAGRAM;
	281	l->chtype = 0x03;
	282	l->endpoint = 0x00;
	283	l->u.datagram.connid = s->sockaddr.u.dgm.connection_id;
	284	break;
	285	case CAIFPROTO_RFM:
	286	l->linktype = CFCTRL_SRV_RFM;
	287	l->u.datagram.connid = s->sockaddr.u.rfm.connection_id;
	288	strncpy(l->u.rfm.volume, s->sockaddr.u.rfm.volume,
	289	sizeof(l->u.rfm.volume)-1);
	290	l->u.rfm.volume[sizeof(l->u.rfm.volume)-1] = 0;
	291	break;
	292	case CAIFPROTO_UTIL:
	293	l->linktype = CFCTRL_SRV_UTIL;
	294	l->endpoint = 0x00;
	295	l->chtype = 0x00;
	296	strncpy(l->u.utility.name, s->sockaddr.u.util.service,
	297	sizeof(l->u.utility.name)-1);
298	l->u.utility.name[sizeof(l->u.utility.name)-1] = 0;
299	caif_assert(sizeof(l->u.utility.name) > 10);
300	l->u.utility.paramlen = s->param.size;
301	if (l->u.utility.paramlen > sizeof(l->u.utility.params))
302	l->u.utility.paramlen = sizeof(l->u.utility.params);
303
304	memcpy(l->u.utility.params, s->param.data,
305	l->u.utility.paramlen);
306
307	break;
308	case CAIFPROTO_DEBUG:
309	l->linktype = CFCTRL_SRV_DBG;
310	l->endpoint = s->sockaddr.u.dbg.service;
311	l->chtype = s->sockaddr.u.dbg.type;
312	break;
313	default:
314	return -EINVAL;
315	}
316	return 0;
317	}
318
319	int caif_connect_client(struct net net, struct caif_connect_request conn_req,
320	struct cflayer adap_layer, int ifindex,
2aa40aef SB	321	int *proto_head,
2aa40aef SB	322	int *proto_tail)
15c9ac0c SB	323	{
15c9ac0c SB	324	struct cflayer *frml;
f3621440	325	struct cfcnfg_phyinfo *phy;
f3621440	326	int err;
bee925db	327	struct cfctrl_link_param param;
	328	struct cfcnfg *cfg = get_cfcnfg(net);
	329	caif_assert(cfg != NULL);
f3621440	330
f3621440	331	rcu_read_lock();
bee925db	332	err = caif_connect_req_to_link_param(cfg, conn_req, &param);
	333	if (err)
	334	goto unlock;
	335
	336	phy = cfcnfg_get_phyinfo_rcu(cfg, param.phyid);
f3621440	337	if (!phy) {
	338	err = -ENODEV;
	339	goto unlock;
	340	}
	341	err = -EINVAL;
	342
15c9ac0c	343	if (adap_layer == NULL) {
b31fa5ba	344	pr_err("adap_layer is zero\n");
f3621440	345	goto unlock;
15c9ac0c SB	346	}
15c9ac0c SB	347	if (adap_layer->receive == NULL) {
b31fa5ba	348	pr_err("adap_layer->receive is NULL\n");
f3621440	349	goto unlock;
15c9ac0c SB	350	}
15c9ac0c SB	351	if (adap_layer->ctrlcmd == NULL) {
b31fa5ba	352	pr_err("adap_layer->ctrlcmd == NULL\n");
f3621440	353	goto unlock;
15c9ac0c	354	}
f3621440	355
	356	err = -ENODEV;
	357	frml = phy->frm_layer;
15c9ac0c	358	if (frml == NULL) {
b31fa5ba	359	pr_err("Specified PHY type does not exist!\n");
f3621440	360	goto unlock;
15c9ac0c	361	}
bee925db	362	caif_assert(param.phyid == phy->id);
f3621440	363	caif_assert(phy->frm_layer->id ==
bee925db	364	param.phyid);
f3621440	365	caif_assert(phy->phy_layer->id ==
bee925db	366	param.phyid);
2aa40aef	367
f3621440	368	*ifindex = phy->ifindex;
f3621440	369	*proto_tail = 2;
2aa40aef	370	*proto_head =
bee925db	371
bee925db	372	protohead[param.linktype] + (phy->use_stx ? 1 : 0);
2aa40aef	373
f3621440	374	rcu_read_unlock();
2aa40aef	375
15c9ac0c	376	/* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
bee925db	377	cfctrl_enum_req(cfg->ctrl, param.phyid);
bee925db	378	return cfctrl_linkup_request(cfg->ctrl, &param, adap_layer);
f3621440	379
	380	unlock:
	381	rcu_read_unlock();
	382	return err;
15c9ac0c	383	}
bee925db	384	EXPORT_SYMBOL(caif_connect_client);
15c9ac0c	385
e539d83c	386	static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
15c9ac0c SB	387	struct cflayer *adapt_layer)
	388	{
	389	if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
	390	adapt_layer->ctrlcmd(adapt_layer,
	391	CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
	392	}
	393
	394	static void
e539d83c	395	cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
f3621440	396	u8 phyid, struct cflayer *adapt_layer)
15c9ac0c SB	397	{
	398	struct cfcnfg *cnfg = container_obj(layer);
	399	struct cflayer *servicel = NULL;
	400	struct cfcnfg_phyinfo *phyinfo;
2aa40aef SB	401	struct net_device *netdev;
2aa40aef SB	402
f3621440	403	rcu_read_lock();
f3621440	404
15c9ac0c	405	if (adapt_layer == NULL) {
f3621440	406	pr_debug("link setup response but no client exist,"
f3621440	407	"send linkdown back\n");
8d545c8f	408	cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL);
f3621440	409	goto unlock;
15c9ac0c SB	410	}
	411
	412	caif_assert(cnfg != NULL);
	413	caif_assert(phyid != 0);
f3621440	414
	415	phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid);
	416	if (phyinfo == NULL) {
	417	pr_err("ERROR: Link Layer Device dissapeared"
	418	"while connecting\n");
	419	goto unlock;
	420	}
	421
	422	caif_assert(phyinfo != NULL);
15c9ac0c SB	423	caif_assert(phyinfo->id == phyid);
	424	caif_assert(phyinfo->phy_layer != NULL);
	425	caif_assert(phyinfo->phy_layer->id == phyid);
	426
e539d83c	427	adapt_layer->id = channel_id;
15c9ac0c SB	428
	429	switch (serv) {
	430	case CFCTRL_SRV_VEI:
e539d83c	431	servicel = cfvei_create(channel_id, &phyinfo->dev_info);
15c9ac0c SB	432	break;
15c9ac0c SB	433	case CFCTRL_SRV_DATAGRAM:
f3621440	434	servicel = cfdgml_create(channel_id,
f3621440	435	&phyinfo->dev_info);
15c9ac0c SB	436	break;
15c9ac0c SB	437	case CFCTRL_SRV_RFM:
2aa40aef	438	netdev = phyinfo->dev_info.dev;
a7da1f55	439	servicel = cfrfml_create(channel_id, &phyinfo->dev_info,
2aa40aef	440	netdev->mtu);
15c9ac0c SB	441	break;
15c9ac0c SB	442	case CFCTRL_SRV_UTIL:
e539d83c	443	servicel = cfutill_create(channel_id, &phyinfo->dev_info);
15c9ac0c SB	444	break;
15c9ac0c SB	445	case CFCTRL_SRV_VIDEO:
e539d83c	446	servicel = cfvidl_create(channel_id, &phyinfo->dev_info);
15c9ac0c SB	447	break;
15c9ac0c SB	448	case CFCTRL_SRV_DBG:
e539d83c	449	servicel = cfdbgl_create(channel_id, &phyinfo->dev_info);
15c9ac0c SB	450	break;
15c9ac0c SB	451	default:
f3621440	452	pr_err("Protocol error. Link setup response "
	453	"- unknown channel type\n");
	454	goto unlock;
15c9ac0c SB	455	}
15c9ac0c SB	456	if (!servicel) {
b31fa5ba	457	pr_warn("Out of memory\n");
f3621440	458	goto unlock;
15c9ac0c SB	459	}
15c9ac0c SB	460	layer_set_dn(servicel, cnfg->mux);
e539d83c	461	cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id);
15c9ac0c SB	462	layer_set_up(servicel, adapt_layer);
15c9ac0c SB	463	layer_set_dn(adapt_layer, servicel);
f3621440	464
	465	rcu_read_unlock();
	466
15c9ac0c	467	servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
f3621440	468	return;
	469	unlock:
	470	rcu_read_unlock();
15c9ac0c SB	471	}
	472
	473	void
	474	cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
2aa40aef	475	struct net_device dev, struct cflayer phy_layer,
bee925db	476	enum cfcnfg_phy_preference pref,
15c9ac0c SB	477	bool fcs, bool stx)
	478	{
	479	struct cflayer *frml;
	480	struct cflayer *phy_driver = NULL;
f3621440	481	struct cfcnfg_phyinfo *phyinfo;
15c9ac0c	482	int i;
f3621440	483	u8 phyid;
15c9ac0c	484
f3621440	485	mutex_lock(&cnfg->lock);
15c9ac0c	486
f3621440	487	/* CAIF protocol allow maximum 6 link-layers */
	488	for (i = 0; i < 7; i++) {
	489	phyid = (dev->ifindex + i) & 0x7;
	490	if (phyid == 0)
	491	continue;
	492	if (cfcnfg_get_phyinfo_rcu(cnfg, phyid) == NULL)
	493	goto got_phyid;
15c9ac0c	494	}
f3621440	495	pr_warn("Too many CAIF Link Layers (max 6)\n");
	496	goto out;
	497
	498	got_phyid:
	499	phyinfo = kzalloc(sizeof(struct cfcnfg_phyinfo), GFP_ATOMIC);
15c9ac0c SB	500
	501	switch (phy_type) {
	502	case CFPHYTYPE_FRAG:
	503	phy_driver =
f3621440	504	cfserl_create(CFPHYTYPE_FRAG, phyid, stx);
15c9ac0c	505	if (!phy_driver) {
b31fa5ba	506	pr_warn("Out of memory\n");
f3621440	507	goto out;
15c9ac0c	508	}
15c9ac0c SB	509	break;
	510	case CFPHYTYPE_CAIF:
	511	phy_driver = NULL;
	512	break;
	513	default:
f3621440	514	goto out;
15c9ac0c	515	}
f3621440	516	phy_layer->id = phyid;
	517	phyinfo->pref = pref;
	518	phyinfo->id = phyid;
	519	phyinfo->dev_info.id = phyid;
	520	phyinfo->dev_info.dev = dev;
	521	phyinfo->phy_layer = phy_layer;
	522	phyinfo->ifindex = dev->ifindex;
	523	phyinfo->use_stx = stx;
	524	phyinfo->use_fcs = fcs;
2aa40aef	525
15c9ac0c	526	phy_layer->type = phy_type;
f3621440	527	frml = cffrml_create(phyid, fcs);
f3621440	528
15c9ac0c	529	if (!frml) {
b31fa5ba	530	pr_warn("Out of memory\n");
f3621440	531	kfree(phyinfo);
f3621440	532	goto out;
15c9ac0c	533	}
f3621440	534	phyinfo->frm_layer = frml;
15c9ac0c SB	535	layer_set_up(frml, cnfg->mux);
	536
	537	if (phy_driver != NULL) {
f3621440	538	phy_driver->id = phyid;
15c9ac0c SB	539	layer_set_dn(frml, phy_driver);
	540	layer_set_up(phy_driver, frml);
	541	layer_set_dn(phy_driver, phy_layer);
	542	layer_set_up(phy_layer, phy_driver);
	543	} else {
	544	layer_set_dn(frml, phy_layer);
	545	layer_set_up(phy_layer, frml);
	546	}
f3621440	547
	548	list_add_rcu(&phyinfo->node, &cnfg->phys);
	549	out:
	550	mutex_unlock(&cnfg->lock);
15c9ac0c SB	551	}
	552	EXPORT_SYMBOL(cfcnfg_add_phy_layer);
	553
f3621440	554	int cfcnfg_set_phy_state(struct cfcnfg cnfg, struct cflayer phy_layer,
	555	bool up)
	556	{
	557	struct cfcnfg_phyinfo *phyinfo;
	558
	559	rcu_read_lock();
	560	phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phy_layer->id);
	561	if (phyinfo == NULL) {
	562	rcu_read_unlock();
	563	return -ENODEV;
	564	}
	565
	566	if (phyinfo->up == up) {
	567	rcu_read_unlock();
	568	return 0;
	569	}
	570	phyinfo->up = up;
	571
	572	if (up) {
	573	cffrml_hold(phyinfo->frm_layer);
	574	cfmuxl_set_dnlayer(cnfg->mux, phyinfo->frm_layer,
	575	phy_layer->id);
	576	} else {
	577	cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
	578	cffrml_put(phyinfo->frm_layer);
	579	}
	580
	581	rcu_read_unlock();
	582	return 0;
	583	}
	584	EXPORT_SYMBOL(cfcnfg_set_phy_state);
	585
15c9ac0c SB	586	int cfcnfg_del_phy_layer(struct cfcnfg cnfg, struct cflayer phy_layer)
	587	{
	588	struct cflayer frml, frml_dn;
	589	u16 phyid;
f3621440	590	struct cfcnfg_phyinfo *phyinfo;
	591
	592	might_sleep();
	593
	594	mutex_lock(&cnfg->lock);
	595
15c9ac0c	596	phyid = phy_layer->id;
f3621440	597	phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid);
f3621440	598
bee925db	599	if (phyinfo == NULL) {
bee925db	600	mutex_unlock(&cnfg->lock);
f3621440	601	return 0;
bee925db	602	}
f3621440	603	caif_assert(phyid == phyinfo->id);
f3621440	604	caif_assert(phy_layer == phyinfo->phy_layer);
15c9ac0c	605	caif_assert(phy_layer->id == phyid);
f3621440	606	caif_assert(phyinfo->frm_layer->id == phyid);
f3621440	607
bee925db	608	list_del_rcu(&phyinfo->node);
	609	synchronize_rcu();
	610
cb3cb423	611	/* Fail if reference count is not zero */
	612	if (cffrml_refcnt_read(phyinfo->frm_layer) != 0) {
	613	pr_info("Wait for device inuse\n");
bee925db	614	list_add_rcu(&phyinfo->node, &cnfg->phys);
cb3cb423	615	mutex_unlock(&cnfg->lock);
	616	return -EAGAIN;
	617	}
	618
f3621440	619	frml = phyinfo->frm_layer;
15c9ac0c SB	620	frml_dn = frml->dn;
	621	cffrml_set_uplayer(frml, NULL);
	622	cffrml_set_dnlayer(frml, NULL);
15c9ac0c SB	623	if (phy_layer != frml_dn) {
	624	layer_set_up(frml_dn, NULL);
	625	layer_set_dn(frml_dn, NULL);
15c9ac0c SB	626	}
15c9ac0c SB	627	layer_set_up(phy_layer, NULL);
f3621440	628
f3621440	629	if (phyinfo->phy_layer != frml_dn)
	630	kfree(frml_dn);
	631
cb3cb423	632	cffrml_free(frml);
f3621440	633	kfree(phyinfo);
	634	mutex_unlock(&cnfg->lock);
	635
15c9ac0c SB	636	return 0;
	637	}
	638	EXPORT_SYMBOL(cfcnfg_del_phy_layer);