[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / caif / cfctrl.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/cfpkt.h>
#include <net/caif/cfctrl.h>

#define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
#define UTILITY_NAME_LENGTH 16
#define CFPKT_CTRL_PKT_LEN 20

#ifdef CAIF_NO_LOOP
static int handle_loop(struct cfctrl *ctrl,
			      int cmd, struct cfpkt *pkt){
	return -1;
}
#else
static int handle_loop(struct cfctrl *ctrl,
		int cmd, struct cfpkt *pkt);
#endif
static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
			   int phyid);


struct cflayer *cfctrl_create(void)
{
	struct dev_info dev_info;
	struct cfctrl *this =
		kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
	if (!this) {
		pr_warn("Out of memory\n");
		return NULL;
	}
	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	memset(&dev_info, 0, sizeof(dev_info));
	dev_info.id = 0xff;
	memset(this, 0, sizeof(*this));
	cfsrvl_init(&this->serv, 0, &dev_info, false);
	atomic_set(&this->req_seq_no, 1);
	atomic_set(&this->rsp_seq_no, 1);
	this->serv.layer.receive = cfctrl_recv;
	sprintf(this->serv.layer.name, "ctrl");
	this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
#ifndef CAIF_NO_LOOP
	spin_lock_init(&this->loop_linkid_lock);
	this->loop_linkid = 1;
#endif
	spin_lock_init(&this->info_list_lock);
	INIT_LIST_HEAD(&this->list);
	return &this->serv.layer;
}

void cfctrl_remove(struct cflayer *layer)
{
	struct cfctrl_request_info *p, *tmp;
	struct cfctrl *ctrl = container_obj(layer);

	spin_lock_bh(&ctrl->info_list_lock);
	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
		list_del(&p->list);
		kfree(p);
	}
	spin_unlock_bh(&ctrl->info_list_lock);
	kfree(layer);
}

static bool param_eq(const struct cfctrl_link_param *p1,
			const struct cfctrl_link_param *p2)
{
	bool eq =
	    p1->linktype == p2->linktype &&
	    p1->priority == p2->priority &&
	    p1->phyid == p2->phyid &&
	    p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;

	if (!eq)
		return false;

	switch (p1->linktype) {
	case CFCTRL_SRV_VEI:
		return true;
	case CFCTRL_SRV_DATAGRAM:
		return p1->u.datagram.connid == p2->u.datagram.connid;
	case CFCTRL_SRV_RFM:
		return
		    p1->u.rfm.connid == p2->u.rfm.connid &&
		    strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
	case CFCTRL_SRV_UTIL:
		return
		    p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
		    && p1->u.utility.fifosize_bufs ==
		    p2->u.utility.fifosize_bufs
		    && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
		    && p1->u.utility.paramlen == p2->u.utility.paramlen
		    && memcmp(p1->u.utility.params, p2->u.utility.params,
			      p1->u.utility.paramlen) == 0;

	case CFCTRL_SRV_VIDEO:
		return p1->u.video.connid == p2->u.video.connid;
	case CFCTRL_SRV_DBG:
		return true;
	case CFCTRL_SRV_DECM:
		return false;
	default:
		return false;
	}
	return false;
}

static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
			  const struct cfctrl_request_info *r2)
{
	if (r1->cmd != r2->cmd)
		return false;
	if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
		return param_eq(&r1->param, &r2->param);
	else
		return r1->channel_id == r2->channel_id;
}

/* Insert request at the end */
static void cfctrl_insert_req(struct cfctrl *ctrl,
			      struct cfctrl_request_info *req)
{
	spin_lock_bh(&ctrl->info_list_lock);
	atomic_inc(&ctrl->req_seq_no);
	req->sequence_no = atomic_read(&ctrl->req_seq_no);
	list_add_tail(&req->list, &ctrl->list);
	spin_unlock_bh(&ctrl->info_list_lock);
}

/* Compare and remove request */
static struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
						struct cfctrl_request_info *req)
{
	struct cfctrl_request_info *p, *tmp, *first;

	first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);

	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
		if (cfctrl_req_eq(req, p)) {
			if (p != first)
				pr_warn("Requests are not received in order\n");

			atomic_set(&ctrl->rsp_seq_no,
					 p->sequence_no);
			list_del(&p->list);
			goto out;
		}
	}
	p = NULL;
out:
	return p;
}

struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
{
	struct cfctrl *this = container_obj(layer);
	return &this->res;
}

static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
{
	info->hdr_len = 0;
	info->channel_id = cfctrl->serv.layer.id;
	info->dev_info = &cfctrl->serv.dev_info;
}

void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
{
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	struct cflayer *dn = cfctrl->serv.layer.dn;
	if (!pkt) {
		pr_warn("Out of memory\n");
		return;
	}
	if (!dn) {
		pr_debug("not able to send enum request\n");
		return;
	}
	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	init_info(cfpkt_info(pkt), cfctrl);
	cfpkt_info(pkt)->dev_info->id = physlinkid;
	cfctrl->serv.dev_info.id = physlinkid;
	cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
	cfpkt_addbdy(pkt, physlinkid);
	dn->transmit(dn, pkt);
}

int cfctrl_linkup_request(struct cflayer *layer,
			   struct cfctrl_link_param *param,
			   struct cflayer *user_layer)
{
	struct cfctrl *cfctrl = container_obj(layer);
	u32 tmp32;
	u16 tmp16;
	u8 tmp8;
	struct cfctrl_request_info *req;
	int ret;
	char utility_name[16];
	struct cfpkt *pkt;
	struct cflayer *dn = cfctrl->serv.layer.dn;

	if (!dn) {
		pr_debug("not able to send linkup request\n");
		return -ENODEV;
	}

	if (cfctrl_cancel_req(layer, user_layer) > 0) {
		/* Slight Paranoia, check if already connecting */
		pr_err("Duplicate connect request for same client\n");
		WARN_ON(1);
		return -EALREADY;
	}

	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warn("Out of memory\n");
		return -ENOMEM;
	}
	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
	cfpkt_addbdy(pkt, (param->chtype << 4) | param->linktype);
	cfpkt_addbdy(pkt, (param->priority << 3) | param->phyid);
	cfpkt_addbdy(pkt, param->endpoint & 0x03);

	switch (param->linktype) {
	case CFCTRL_SRV_VEI:
		break;
	case CFCTRL_SRV_VIDEO:
		cfpkt_addbdy(pkt, (u8) param->u.video.connid);
		break;
	case CFCTRL_SRV_DBG:
		break;
	case CFCTRL_SRV_DATAGRAM:
		tmp32 = cpu_to_le32(param->u.datagram.connid);
		cfpkt_add_body(pkt, &tmp32, 4);
		break;
	case CFCTRL_SRV_RFM:
		/* Construct a frame, convert DatagramConnectionID to network
		 * format long and copy it out...
		 */
		tmp32 = cpu_to_le32(param->u.rfm.connid);
		cfpkt_add_body(pkt, &tmp32, 4);
		/* Add volume name, including zero termination... */
		cfpkt_add_body(pkt, param->u.rfm.volume,
			       strlen(param->u.rfm.volume) + 1);
		break;
	case CFCTRL_SRV_UTIL:
		tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
		cfpkt_add_body(pkt, &tmp16, 2);
		tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
		cfpkt_add_body(pkt, &tmp16, 2);
		memset(utility_name, 0, sizeof(utility_name));
		strncpy(utility_name, param->u.utility.name,
			UTILITY_NAME_LENGTH - 1);
		cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
		tmp8 = param->u.utility.paramlen;
		cfpkt_add_body(pkt, &tmp8, 1);
		cfpkt_add_body(pkt, param->u.utility.params,
			       param->u.utility.paramlen);
		break;
	default:
		pr_warn("Request setup of bad link type = %d\n",
			param->linktype);
		return -EINVAL;
	}
	req = kzalloc(sizeof(*req), GFP_KERNEL);
	if (!req) {
		pr_warn("Out of memory\n");
		return -ENOMEM;
	}
	req->client_layer = user_layer;
	req->cmd = CFCTRL_CMD_LINK_SETUP;
	req->param = *param;
	cfctrl_insert_req(cfctrl, req);
	init_info(cfpkt_info(pkt), cfctrl);
	/*
	 * NOTE:Always send linkup and linkdown request on the same
	 *	device as the payload. Otherwise old queued up payload
	 *	might arrive with the newly allocated channel ID.
	 */
	cfpkt_info(pkt)->dev_info->id = param->phyid;
	ret =
	    dn->transmit(dn, pkt);
	if (ret < 0) {
		int count;

		count = cfctrl_cancel_req(&cfctrl->serv.layer,
						user_layer);
		if (count != 1)
			pr_err("Could not remove request (%d)", count);
			return -ENODEV;
	}
	return 0;
}

int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
				struct cflayer *client)
{
	int ret;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	struct cflayer *dn = cfctrl->serv.layer.dn;

	if (!pkt) {
		pr_warn("Out of memory\n");
		return -ENOMEM;
	}

	if (!dn) {
		pr_debug("not able to send link-down request\n");
		return -ENODEV;
	}

	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
	cfpkt_addbdy(pkt, channelid);
	init_info(cfpkt_info(pkt), cfctrl);
	ret =
	    dn->transmit(dn, pkt);
#ifndef CAIF_NO_LOOP
	cfctrl->loop_linkused[channelid] = 0;
#endif
	return ret;
}

int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
{
	struct cfctrl_request_info *p, *tmp;
	struct cfctrl *ctrl = container_obj(layr);
	int found = 0;
	spin_lock_bh(&ctrl->info_list_lock);

	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
		if (p->client_layer == adap_layer) {
			list_del(&p->list);
			kfree(p);
			found++;
		}
	}

	spin_unlock_bh(&ctrl->info_list_lock);
	return found;
}

static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
{
	u8 cmdrsp;
	u8 cmd;
	int ret = -1;
	u16 tmp16;
	u8 len;
	u8 param[255];
	u8 linkid;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfctrl_request_info rsp, *req;


	cfpkt_extr_head(pkt, &cmdrsp, 1);
	cmd = cmdrsp & CFCTRL_CMD_MASK;
	if (cmd != CFCTRL_CMD_LINK_ERR
	    && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
		if (handle_loop(cfctrl, cmd, pkt) != 0)
			cmdrsp |= CFCTRL_ERR_BIT;
	}

	switch (cmd) {
	case CFCTRL_CMD_LINK_SETUP:
		{
			enum cfctrl_srv serv;
			enum cfctrl_srv servtype;
			u8 endpoint;
			u8 physlinkid;
			u8 prio;
			u8 tmp;
			u32 tmp32;
			u8 *cp;
			int i;
			struct cfctrl_link_param linkparam;
			memset(&linkparam, 0, sizeof(linkparam));

			cfpkt_extr_head(pkt, &tmp, 1);

			serv = tmp & CFCTRL_SRV_MASK;
			linkparam.linktype = serv;

			servtype = tmp >> 4;
			linkparam.chtype = servtype;

			cfpkt_extr_head(pkt, &tmp, 1);
			physlinkid = tmp & 0x07;
			prio = tmp >> 3;

			linkparam.priority = prio;
			linkparam.phyid = physlinkid;
			cfpkt_extr_head(pkt, &endpoint, 1);
			linkparam.endpoint = endpoint & 0x03;

			switch (serv) {
			case CFCTRL_SRV_VEI:
			case CFCTRL_SRV_DBG:
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				break;
			case CFCTRL_SRV_VIDEO:
				cfpkt_extr_head(pkt, &tmp, 1);
				linkparam.u.video.connid = tmp;
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				break;

			case CFCTRL_SRV_DATAGRAM:
				cfpkt_extr_head(pkt, &tmp32, 4);
				linkparam.u.datagram.connid =
				    le32_to_cpu(tmp32);
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				break;
			case CFCTRL_SRV_RFM:
				/* Construct a frame, convert
				 * DatagramConnectionID
				 * to network format long and copy it out...
				 */
				cfpkt_extr_head(pkt, &tmp32, 4);
				linkparam.u.rfm.connid =
				  le32_to_cpu(tmp32);
				cp = (u8 *) linkparam.u.rfm.volume;
				for (cfpkt_extr_head(pkt, &tmp, 1);
				     cfpkt_more(pkt) && tmp != '\0';
				     cfpkt_extr_head(pkt, &tmp, 1))
					*cp++ = tmp;
				*cp = '\0';

				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);

				break;
			case CFCTRL_SRV_UTIL:
				/* Construct a frame, convert
				 * DatagramConnectionID
				 * to network format long and copy it out...
				 */
				/* Fifosize KB */
				cfpkt_extr_head(pkt, &tmp16, 2);
				linkparam.u.utility.fifosize_kb =
				    le16_to_cpu(tmp16);
				/* Fifosize bufs */
				cfpkt_extr_head(pkt, &tmp16, 2);
				linkparam.u.utility.fifosize_bufs =
				    le16_to_cpu(tmp16);
				/* name */
				cp = (u8 *) linkparam.u.utility.name;
				caif_assert(sizeof(linkparam.u.utility.name)
					     >= UTILITY_NAME_LENGTH);
				for (i = 0;
				     i < UTILITY_NAME_LENGTH
				     && cfpkt_more(pkt); i++) {
					cfpkt_extr_head(pkt, &tmp, 1);
					*cp++ = tmp;
				}
				/* Length */
				cfpkt_extr_head(pkt, &len, 1);
				linkparam.u.utility.paramlen = len;
				/* Param Data */
				cp = linkparam.u.utility.params;
				while (cfpkt_more(pkt) && len--) {
					cfpkt_extr_head(pkt, &tmp, 1);
					*cp++ = tmp;
				}
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				/* Length */
				cfpkt_extr_head(pkt, &len, 1);
				/* Param Data */
				cfpkt_extr_head(pkt, &param, len);
				break;
			default:
				pr_warn("Request setup, invalid type (%d)\n",
					serv);
				goto error;
			}

			rsp.cmd = cmd;
			rsp.param = linkparam;
			spin_lock_bh(&cfctrl->info_list_lock);
			req = cfctrl_remove_req(cfctrl, &rsp);

			if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
				cfpkt_erroneous(pkt)) {
				pr_err("Invalid O/E bit or parse error "
						"on CAIF control channel\n");
				cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
						       0,
						       req ? req->client_layer
						       : NULL);
			} else {
				cfctrl->res.linksetup_rsp(cfctrl->serv.
							  layer.up, linkid,
							  serv, physlinkid,
							  req ? req->
							  client_layer : NULL);
			}

			if (req != NULL)
				kfree(req);

			spin_unlock_bh(&cfctrl->info_list_lock);
		}
		break;
	case CFCTRL_CMD_LINK_DESTROY:
		cfpkt_extr_head(pkt, &linkid, 1);
		cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
		break;
	case CFCTRL_CMD_LINK_ERR:
		pr_err("Frame Error Indication received\n");
		cfctrl->res.linkerror_ind();
		break;
	case CFCTRL_CMD_ENUM:
		cfctrl->res.enum_rsp();
		break;
	case CFCTRL_CMD_SLEEP:
		cfctrl->res.sleep_rsp();
		break;
	case CFCTRL_CMD_WAKE:
		cfctrl->res.wake_rsp();
		break;
	case CFCTRL_CMD_LINK_RECONF:
		cfctrl->res.restart_rsp();
		break;
	case CFCTRL_CMD_RADIO_SET:
		cfctrl->res.radioset_rsp();
		break;
	default:
		pr_err("Unrecognized Control Frame\n");
		goto error;
		break;
	}
	ret = 0;
error:
	cfpkt_destroy(pkt);
	return ret;
}

static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
			int phyid)
{
	struct cfctrl *this = container_obj(layr);
	switch (ctrl) {
	case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
	case CAIF_CTRLCMD_FLOW_OFF_IND:
		spin_lock_bh(&this->info_list_lock);
		if (!list_empty(&this->list))
			pr_debug("Received flow off in control layer\n");
		spin_unlock_bh(&this->info_list_lock);
		break;
	case _CAIF_CTRLCMD_PHYIF_DOWN_IND: {
		struct cfctrl_request_info *p, *tmp;

		/* Find all connect request and report failure */
		spin_lock_bh(&this->info_list_lock);
		list_for_each_entry_safe(p, tmp, &this->list, list) {
			if (p->param.phyid == phyid) {
				list_del(&p->list);
				p->client_layer->ctrlcmd(p->client_layer,
						CAIF_CTRLCMD_INIT_FAIL_RSP,
						phyid);
				kfree(p);
			}
		}
		spin_unlock_bh(&this->info_list_lock);
		break;
	}
	default:
		break;
	}
}

#ifndef CAIF_NO_LOOP
static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
{
	static int last_linkid;
	static int dec;
	u8 linkid, linktype, tmp;
	switch (cmd) {
	case CFCTRL_CMD_LINK_SETUP:
		spin_lock_bh(&ctrl->loop_linkid_lock);
		if (!dec) {
			for (linkid = last_linkid + 1; linkid < 255; linkid++)
				if (!ctrl->loop_linkused[linkid])
					goto found;
		}
		dec = 1;
		for (linkid = last_linkid - 1; linkid > 0; linkid--)
			if (!ctrl->loop_linkused[linkid])
				goto found;
		spin_unlock_bh(&ctrl->loop_linkid_lock);

found:
		if (linkid < 10)
			dec = 0;

		if (!ctrl->loop_linkused[linkid])
			ctrl->loop_linkused[linkid] = 1;

		last_linkid = linkid;

		cfpkt_add_trail(pkt, &linkid, 1);
		spin_unlock_bh(&ctrl->loop_linkid_lock);
		cfpkt_peek_head(pkt, &linktype, 1);
		if (linktype ==  CFCTRL_SRV_UTIL) {
			tmp = 0x01;
			cfpkt_add_trail(pkt, &tmp, 1);
			cfpkt_add_trail(pkt, &tmp, 1);
		}
		break;

	case CFCTRL_CMD_LINK_DESTROY:
		spin_lock_bh(&ctrl->loop_linkid_lock);
		cfpkt_peek_head(pkt, &linkid, 1);
		ctrl->loop_linkused[linkid] = 0;
		spin_unlock_bh(&ctrl->loop_linkid_lock);
		break;
	default:
		break;
	}
	return 0;
}
#endif
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/cfpkt.h>
	14	#include <net/caif/cfctrl.h>
	15
	16	#define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
	17	#define UTILITY_NAME_LENGTH 16
	18	#define CFPKT_CTRL_PKT_LEN 20
	19
b482cd20 SB	20	#ifdef CAIF_NO_LOOP
	21	static int handle_loop(struct cfctrl *ctrl,
	22	int cmd, struct cfpkt *pkt){
2aa40aef	23	return -1;
b482cd20 SB	24	}
	25	#else
	26	static int handle_loop(struct cfctrl *ctrl,
	27	int cmd, struct cfpkt *pkt);
	28	#endif
	29	static int cfctrl_recv(struct cflayer layr, struct cfpkt pkt);
	30	static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
	31	int phyid);
	32
	33
	34	struct cflayer *cfctrl_create(void)
	35	{
8d545c8f	36	struct dev_info dev_info;
b482cd20 SB	37	struct cfctrl *this =
	38	kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
	39	if (!this) {
b31fa5ba	40	pr_warn("Out of memory\n");
b482cd20 SB	41	return NULL;
	42	}
	43	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
8d545c8f SB	44	memset(&dev_info, 0, sizeof(dev_info));
8d545c8f SB	45	dev_info.id = 0xff;
b482cd20	46	memset(this, 0, sizeof(*this));
b1c74247	47	cfsrvl_init(&this->serv, 0, &dev_info, false);
b482cd20 SB	48	atomic_set(&this->req_seq_no, 1);
b482cd20 SB	49	atomic_set(&this->rsp_seq_no, 1);
b482cd20 SB	50	this->serv.layer.receive = cfctrl_recv;
	51	sprintf(this->serv.layer.name, "ctrl");
	52	this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
c85c2951	53	#ifndef CAIF_NO_LOOP
b482cd20	54	spin_lock_init(&this->loop_linkid_lock);
c85c2951	55	this->loop_linkid = 1;
c85c2951	56	#endif
7aecf494 SB	57	spin_lock_init(&this->info_list_lock);
7aecf494 SB	58	INIT_LIST_HEAD(&this->list);
b482cd20 SB	59	return &this->serv.layer;
	60	}
	61
c85c2951	62	void cfctrl_remove(struct cflayer *layer)
	63	{
	64	struct cfctrl_request_info p, tmp;
	65	struct cfctrl *ctrl = container_obj(layer);
	66
	67	spin_lock_bh(&ctrl->info_list_lock);
	68	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
	69	list_del(&p->list);
	70	kfree(p);
	71	}
	72	spin_unlock_bh(&ctrl->info_list_lock);
	73	kfree(layer);
	74	}
	75
73d6ac63 SH	76	static bool param_eq(const struct cfctrl_link_param *p1,
73d6ac63 SH	77	const struct cfctrl_link_param *p2)
b482cd20 SB	78	{
	79	bool eq =
	80	p1->linktype == p2->linktype &&
	81	p1->priority == p2->priority &&
	82	p1->phyid == p2->phyid &&
	83	p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
	84
	85	if (!eq)
	86	return false;
	87
	88	switch (p1->linktype) {
	89	case CFCTRL_SRV_VEI:
	90	return true;
	91	case CFCTRL_SRV_DATAGRAM:
	92	return p1->u.datagram.connid == p2->u.datagram.connid;
	93	case CFCTRL_SRV_RFM:
	94	return
	95	p1->u.rfm.connid == p2->u.rfm.connid &&
	96	strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
	97	case CFCTRL_SRV_UTIL:
	98	return
	99	p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
	100	&& p1->u.utility.fifosize_bufs ==
	101	p2->u.utility.fifosize_bufs
	102	&& strcmp(p1->u.utility.name, p2->u.utility.name) == 0
	103	&& p1->u.utility.paramlen == p2->u.utility.paramlen
	104	&& memcmp(p1->u.utility.params, p2->u.utility.params,
	105	p1->u.utility.paramlen) == 0;
	106
	107	case CFCTRL_SRV_VIDEO:
	108	return p1->u.video.connid == p2->u.video.connid;
	109	case CFCTRL_SRV_DBG:
	110	return true;
	111	case CFCTRL_SRV_DECM:
	112	return false;
	113	default:
	114	return false;
	115	}
	116	return false;
	117	}
	118
73d6ac63 SH	119	static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
73d6ac63 SH	120	const struct cfctrl_request_info *r2)
b482cd20 SB	121	{
	122	if (r1->cmd != r2->cmd)
	123	return false;
	124	if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
	125	return param_eq(&r1->param, &r2->param);
	126	else
	127	return r1->channel_id == r2->channel_id;
	128	}
	129
	130	/* Insert request at the end */
73d6ac63	131	static void cfctrl_insert_req(struct cfctrl *ctrl,
b482cd20 SB	132	struct cfctrl_request_info *req)
b482cd20 SB	133	{
c85c2951	134	spin_lock_bh(&ctrl->info_list_lock);
b482cd20 SB	135	atomic_inc(&ctrl->req_seq_no);
b482cd20 SB	136	req->sequence_no = atomic_read(&ctrl->req_seq_no);
7aecf494	137	list_add_tail(&req->list, &ctrl->list);
c85c2951	138	spin_unlock_bh(&ctrl->info_list_lock);
b482cd20 SB	139	}
b482cd20 SB	140
b482cd20	141	/* Compare and remove request */
73d6ac63 SH	142	static struct cfctrl_request_info cfctrl_remove_req(struct cfctrl ctrl,
73d6ac63 SH	143	struct cfctrl_request_info *req)
b482cd20	144	{
7aecf494	145	struct cfctrl_request_info p, tmp, *first;
b482cd20	146
7aecf494	147	first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
b482cd20	148
7aecf494 SB	149	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
	150	if (cfctrl_req_eq(req, p)) {
	151	if (p != first)
b31fa5ba	152	pr_warn("Requests are not received in order\n");
7aecf494	153
b482cd20	154	atomic_set(&ctrl->rsp_seq_no,
7aecf494 SB	155	p->sequence_no);
	156	list_del(&p->list);
	157	goto out;
b482cd20	158	}
b482cd20	159	}
7aecf494 SB	160	p = NULL;
7aecf494 SB	161	out:
7aecf494	162	return p;
b482cd20 SB	163	}
	164
	165	struct cfctrl_rsp cfctrl_get_respfuncs(struct cflayer layer)
	166	{
	167	struct cfctrl *this = container_obj(layer);
	168	return &this->res;
	169	}
	170
b482cd20 SB	171	static void init_info(struct caif_payload_info info, struct cfctrl cfctrl)
	172	{
	173	info->hdr_len = 0;
	174	info->channel_id = cfctrl->serv.layer.id;
	175	info->dev_info = &cfctrl->serv.dev_info;
	176	}
	177
	178	void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
	179	{
	180	struct cfctrl *cfctrl = container_obj(layer);
b482cd20	181	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
0e5a1174	182	struct cflayer *dn = cfctrl->serv.layer.dn;
b482cd20	183	if (!pkt) {
b31fa5ba	184	pr_warn("Out of memory\n");
b482cd20 SB	185	return;
b482cd20 SB	186	}
0e5a1174	187	if (!dn) {
	188	pr_debug("not able to send enum request\n");
	189	return;
	190	}
b482cd20 SB	191	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	192	init_info(cfpkt_info(pkt), cfctrl);
	193	cfpkt_info(pkt)->dev_info->id = physlinkid;
	194	cfctrl->serv.dev_info.id = physlinkid;
	195	cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
	196	cfpkt_addbdy(pkt, physlinkid);
0e5a1174	197	dn->transmit(dn, pkt);
b482cd20 SB	198	}
b482cd20 SB	199
8d545c8f	200	int cfctrl_linkup_request(struct cflayer *layer,
b482cd20 SB	201	struct cfctrl_link_param *param,
	202	struct cflayer *user_layer)
	203	{
	204	struct cfctrl *cfctrl = container_obj(layer);
	205	u32 tmp32;
	206	u16 tmp16;
	207	u8 tmp8;
	208	struct cfctrl_request_info *req;
	209	int ret;
	210	char utility_name[16];
c85c2951	211	struct cfpkt *pkt;
0e5a1174	212	struct cflayer *dn = cfctrl->serv.layer.dn;
	213
	214	if (!dn) {
	215	pr_debug("not able to send linkup request\n");
	216	return -ENODEV;
	217	}
c85c2951	218
	219	if (cfctrl_cancel_req(layer, user_layer) > 0) {
	220	/* Slight Paranoia, check if already connecting */
	221	pr_err("Duplicate connect request for same client\n");
	222	WARN_ON(1);
	223	return -EALREADY;
	224	}
	225
	226	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
b482cd20	227	if (!pkt) {
b31fa5ba	228	pr_warn("Out of memory\n");
8d545c8f	229	return -ENOMEM;
b482cd20 SB	230	}
b482cd20 SB	231	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
c85c2951	232	cfpkt_addbdy(pkt, (param->chtype << 4) \| param->linktype);
c85c2951	233	cfpkt_addbdy(pkt, (param->priority << 3) \| param->phyid);
b482cd20 SB	234	cfpkt_addbdy(pkt, param->endpoint & 0x03);
	235
	236	switch (param->linktype) {
	237	case CFCTRL_SRV_VEI:
	238	break;
	239	case CFCTRL_SRV_VIDEO:
	240	cfpkt_addbdy(pkt, (u8) param->u.video.connid);
	241	break;
	242	case CFCTRL_SRV_DBG:
	243	break;
	244	case CFCTRL_SRV_DATAGRAM:
	245	tmp32 = cpu_to_le32(param->u.datagram.connid);
	246	cfpkt_add_body(pkt, &tmp32, 4);
	247	break;
	248	case CFCTRL_SRV_RFM:
	249	/* Construct a frame, convert DatagramConnectionID to network
	250	* format long and copy it out...
	251	*/
	252	tmp32 = cpu_to_le32(param->u.rfm.connid);
	253	cfpkt_add_body(pkt, &tmp32, 4);
	254	/* Add volume name, including zero termination... */
	255	cfpkt_add_body(pkt, param->u.rfm.volume,
	256	strlen(param->u.rfm.volume) + 1);
	257	break;
	258	case CFCTRL_SRV_UTIL:
	259	tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
	260	cfpkt_add_body(pkt, &tmp16, 2);
	261	tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
	262	cfpkt_add_body(pkt, &tmp16, 2);
	263	memset(utility_name, 0, sizeof(utility_name));
	264	strncpy(utility_name, param->u.utility.name,
	265	UTILITY_NAME_LENGTH - 1);
	266	cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
	267	tmp8 = param->u.utility.paramlen;
	268	cfpkt_add_body(pkt, &tmp8, 1);
	269	cfpkt_add_body(pkt, param->u.utility.params,
	270	param->u.utility.paramlen);
	271	break;
	272	default:
b31fa5ba JP	273	pr_warn("Request setup of bad link type = %d\n",
b31fa5ba JP	274	param->linktype);
8d545c8f	275	return -EINVAL;
b482cd20	276	}
49afa55b	277	req = kzalloc(sizeof(*req), GFP_KERNEL);
b482cd20	278	if (!req) {
b31fa5ba	279	pr_warn("Out of memory\n");
8d545c8f	280	return -ENOMEM;
b482cd20	281	}
b482cd20 SB	282	req->client_layer = user_layer;
	283	req->cmd = CFCTRL_CMD_LINK_SETUP;
	284	req->param = *param;
	285	cfctrl_insert_req(cfctrl, req);
	286	init_info(cfpkt_info(pkt), cfctrl);
8d545c8f SB	287	/*
	288	* NOTE:Always send linkup and linkdown request on the same
	289	* device as the payload. Otherwise old queued up payload
	290	* might arrive with the newly allocated channel ID.
	291	*/
b482cd20 SB	292	cfpkt_info(pkt)->dev_info->id = param->phyid;
b482cd20 SB	293	ret =
0e5a1174	294	dn->transmit(dn, pkt);
b482cd20	295	if (ret < 0) {
c85c2951	296	int count;
	297
	298	count = cfctrl_cancel_req(&cfctrl->serv.layer,
	299	user_layer);
	300	if (count != 1)
	301	pr_err("Could not remove request (%d)", count);
	302	return -ENODEV;
b482cd20	303	}
8d545c8f	304	return 0;
b482cd20 SB	305	}
	306
	307	int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
	308	struct cflayer *client)
	309	{
	310	int ret;
	311	struct cfctrl *cfctrl = container_obj(layer);
	312	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
0e5a1174	313	struct cflayer *dn = cfctrl->serv.layer.dn;
0e5a1174	314
b482cd20	315	if (!pkt) {
b31fa5ba	316	pr_warn("Out of memory\n");
b482cd20 SB	317	return -ENOMEM;
b482cd20 SB	318	}
0e5a1174	319
	320	if (!dn) {
	321	pr_debug("not able to send link-down request\n");
	322	return -ENODEV;
	323	}
	324
b482cd20 SB	325	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
	326	cfpkt_addbdy(pkt, channelid);
	327	init_info(cfpkt_info(pkt), cfctrl);
	328	ret =
0e5a1174	329	dn->transmit(dn, pkt);
c85c2951	330	#ifndef CAIF_NO_LOOP
	331	cfctrl->loop_linkused[channelid] = 0;
	332	#endif
b482cd20 SB	333	return ret;
	334	}
	335
c85c2951	336	int cfctrl_cancel_req(struct cflayer layr, struct cflayer adap_layer)
8d545c8f	337	{
7aecf494	338	struct cfctrl_request_info p, tmp;
8d545c8f	339	struct cfctrl *ctrl = container_obj(layr);
c85c2951	340	int found = 0;
c85c2951	341	spin_lock_bh(&ctrl->info_list_lock);
7aecf494 SB	342
	343	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
	344	if (p->client_layer == adap_layer) {
7aecf494 SB	345	list_del(&p->list);
7aecf494 SB	346	kfree(p);
c85c2951	347	found++;
8d545c8f	348	}
8d545c8f SB	349	}
8d545c8f SB	350
c85c2951	351	spin_unlock_bh(&ctrl->info_list_lock);
c85c2951	352	return found;
8d545c8f SB	353	}
8d545c8f SB	354
b482cd20 SB	355	static int cfctrl_recv(struct cflayer layer, struct cfpkt pkt)
	356	{
	357	u8 cmdrsp;
	358	u8 cmd;
	359	int ret = -1;
	360	u16 tmp16;
	361	u8 len;
	362	u8 param[255];
	363	u8 linkid;
	364	struct cfctrl *cfctrl = container_obj(layer);
	365	struct cfctrl_request_info rsp, *req;
	366
	367
	368	cfpkt_extr_head(pkt, &cmdrsp, 1);
	369	cmd = cmdrsp & CFCTRL_CMD_MASK;
	370	if (cmd != CFCTRL_CMD_LINK_ERR
	371	&& CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
2aa40aef	372	if (handle_loop(cfctrl, cmd, pkt) != 0)
8d545c8f	373	cmdrsp \|= CFCTRL_ERR_BIT;
b482cd20 SB	374	}
	375
	376	switch (cmd) {
	377	case CFCTRL_CMD_LINK_SETUP:
	378	{
	379	enum cfctrl_srv serv;
	380	enum cfctrl_srv servtype;
	381	u8 endpoint;
	382	u8 physlinkid;
	383	u8 prio;
	384	u8 tmp;
	385	u32 tmp32;
	386	u8 *cp;
	387	int i;
	388	struct cfctrl_link_param linkparam;
	389	memset(&linkparam, 0, sizeof(linkparam));
	390
	391	cfpkt_extr_head(pkt, &tmp, 1);
	392
	393	serv = tmp & CFCTRL_SRV_MASK;
	394	linkparam.linktype = serv;
	395
	396	servtype = tmp >> 4;
	397	linkparam.chtype = servtype;
	398
	399	cfpkt_extr_head(pkt, &tmp, 1);
	400	physlinkid = tmp & 0x07;
	401	prio = tmp >> 3;
	402
	403	linkparam.priority = prio;
	404	linkparam.phyid = physlinkid;
	405	cfpkt_extr_head(pkt, &endpoint, 1);
	406	linkparam.endpoint = endpoint & 0x03;
	407
	408	switch (serv) {
	409	case CFCTRL_SRV_VEI:
	410	case CFCTRL_SRV_DBG:
8d545c8f SB	411	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	412	break;
b482cd20 SB	413	/* Link ID */
	414	cfpkt_extr_head(pkt, &linkid, 1);
	415	break;
	416	case CFCTRL_SRV_VIDEO:
	417	cfpkt_extr_head(pkt, &tmp, 1);
	418	linkparam.u.video.connid = tmp;
8d545c8f SB	419	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	420	break;
b482cd20 SB	421	/* Link ID */
	422	cfpkt_extr_head(pkt, &linkid, 1);
	423	break;
	424
	425	case CFCTRL_SRV_DATAGRAM:
	426	cfpkt_extr_head(pkt, &tmp32, 4);
	427	linkparam.u.datagram.connid =
	428	le32_to_cpu(tmp32);
8d545c8f SB	429	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	430	break;
b482cd20 SB	431	/* Link ID */
	432	cfpkt_extr_head(pkt, &linkid, 1);
	433	break;
	434	case CFCTRL_SRV_RFM:
	435	/* Construct a frame, convert
	436	* DatagramConnectionID
	437	* to network format long and copy it out...
	438	*/
	439	cfpkt_extr_head(pkt, &tmp32, 4);
	440	linkparam.u.rfm.connid =
	441	le32_to_cpu(tmp32);
	442	cp = (u8 *) linkparam.u.rfm.volume;
	443	for (cfpkt_extr_head(pkt, &tmp, 1);
	444	cfpkt_more(pkt) && tmp != '\0';
	445	cfpkt_extr_head(pkt, &tmp, 1))
	446	*cp++ = tmp;
	447	*cp = '\0';
	448
8d545c8f SB	449	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	450	break;
b482cd20 SB	451	/* Link ID */
	452	cfpkt_extr_head(pkt, &linkid, 1);
	453
	454	break;
	455	case CFCTRL_SRV_UTIL:
	456	/* Construct a frame, convert
	457	* DatagramConnectionID
	458	* to network format long and copy it out...
	459	*/
	460	/* Fifosize KB */
	461	cfpkt_extr_head(pkt, &tmp16, 2);
	462	linkparam.u.utility.fifosize_kb =
	463	le16_to_cpu(tmp16);
	464	/* Fifosize bufs */
	465	cfpkt_extr_head(pkt, &tmp16, 2);
	466	linkparam.u.utility.fifosize_bufs =
	467	le16_to_cpu(tmp16);
	468	/* name */
	469	cp = (u8 *) linkparam.u.utility.name;
	470	caif_assert(sizeof(linkparam.u.utility.name)
	471	>= UTILITY_NAME_LENGTH);
	472	for (i = 0;
	473	i < UTILITY_NAME_LENGTH
	474	&& cfpkt_more(pkt); i++) {
	475	cfpkt_extr_head(pkt, &tmp, 1);
	476	*cp++ = tmp;
	477	}
	478	/* Length */
	479	cfpkt_extr_head(pkt, &len, 1);
	480	linkparam.u.utility.paramlen = len;
	481	/* Param Data */
	482	cp = linkparam.u.utility.params;
	483	while (cfpkt_more(pkt) && len--) {
	484	cfpkt_extr_head(pkt, &tmp, 1);
	485	*cp++ = tmp;
	486	}
8d545c8f SB	487	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	488	break;
b482cd20 SB	489	/* Link ID */
	490	cfpkt_extr_head(pkt, &linkid, 1);
	491	/* Length */
	492	cfpkt_extr_head(pkt, &len, 1);
	493	/* Param Data */
	494	cfpkt_extr_head(pkt, &param, len);
	495	break;
	496	default:
0e5a1174	497	pr_warn("Request setup, invalid type (%d)\n",
b31fa5ba	498	serv);
b482cd20 SB	499	goto error;
	500	}
	501
	502	rsp.cmd = cmd;
	503	rsp.param = linkparam;
c85c2951	504	spin_lock_bh(&cfctrl->info_list_lock);
b482cd20 SB	505	req = cfctrl_remove_req(cfctrl, &rsp);
	506
	507	if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) \|\|
	508	cfpkt_erroneous(pkt)) {
0e5a1174	509	pr_err("Invalid O/E bit or parse error "
0e5a1174	510	"on CAIF control channel\n");
b482cd20 SB	511	cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
	512	0,
	513	req ? req->client_layer
	514	: NULL);
	515	} else {
	516	cfctrl->res.linksetup_rsp(cfctrl->serv.
	517	layer.up, linkid,
	518	serv, physlinkid,
	519	req ? req->
	520	client_layer : NULL);
	521	}
	522
	523	if (req != NULL)
	524	kfree(req);
c85c2951	525
c85c2951	526	spin_unlock_bh(&cfctrl->info_list_lock);
b482cd20 SB	527	}
	528	break;
	529	case CFCTRL_CMD_LINK_DESTROY:
	530	cfpkt_extr_head(pkt, &linkid, 1);
8d545c8f	531	cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
b482cd20 SB	532	break;
b482cd20 SB	533	case CFCTRL_CMD_LINK_ERR:
b31fa5ba	534	pr_err("Frame Error Indication received\n");
b482cd20 SB	535	cfctrl->res.linkerror_ind();
	536	break;
	537	case CFCTRL_CMD_ENUM:
	538	cfctrl->res.enum_rsp();
	539	break;
	540	case CFCTRL_CMD_SLEEP:
	541	cfctrl->res.sleep_rsp();
	542	break;
	543	case CFCTRL_CMD_WAKE:
	544	cfctrl->res.wake_rsp();
	545	break;
	546	case CFCTRL_CMD_LINK_RECONF:
	547	cfctrl->res.restart_rsp();
	548	break;
	549	case CFCTRL_CMD_RADIO_SET:
	550	cfctrl->res.radioset_rsp();
	551	break;
	552	default:
b31fa5ba	553	pr_err("Unrecognized Control Frame\n");
b482cd20 SB	554	goto error;
	555	break;
	556	}
	557	ret = 0;
	558	error:
	559	cfpkt_destroy(pkt);
	560	return ret;
	561	}
	562
	563	static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
	564	int phyid)
	565	{
	566	struct cfctrl *this = container_obj(layr);
	567	switch (ctrl) {
	568	case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
	569	case CAIF_CTRLCMD_FLOW_OFF_IND:
c85c2951	570	spin_lock_bh(&this->info_list_lock);
0e5a1174	571	if (!list_empty(&this->list))
b31fa5ba	572	pr_debug("Received flow off in control layer\n");
c85c2951	573	spin_unlock_bh(&this->info_list_lock);
b482cd20	574	break;
c85c2951	575	case _CAIF_CTRLCMD_PHYIF_DOWN_IND: {
	576	struct cfctrl_request_info p, tmp;
	577
	578	/* Find all connect request and report failure */
	579	spin_lock_bh(&this->info_list_lock);
	580	list_for_each_entry_safe(p, tmp, &this->list, list) {
	581	if (p->param.phyid == phyid) {
	582	list_del(&p->list);
	583	p->client_layer->ctrlcmd(p->client_layer,
	584	CAIF_CTRLCMD_INIT_FAIL_RSP,
	585	phyid);
	586	kfree(p);
	587	}
	588	}
	589	spin_unlock_bh(&this->info_list_lock);
	590	break;
	591	}
b482cd20 SB	592	default:
	593	break;
	594	}
	595	}
	596
	597	#ifndef CAIF_NO_LOOP
	598	static int handle_loop(struct cfctrl ctrl, int cmd, struct cfpkt pkt)
	599	{
	600	static int last_linkid;
c85c2951	601	static int dec;
b482cd20 SB	602	u8 linkid, linktype, tmp;
	603	switch (cmd) {
	604	case CFCTRL_CMD_LINK_SETUP:
c85c2951	605	spin_lock_bh(&ctrl->loop_linkid_lock);
	606	if (!dec) {
	607	for (linkid = last_linkid + 1; linkid < 255; linkid++)
	608	if (!ctrl->loop_linkused[linkid])
	609	goto found;
	610	}
	611	dec = 1;
b482cd20 SB	612	for (linkid = last_linkid - 1; linkid > 0; linkid--)
	613	if (!ctrl->loop_linkused[linkid])
	614	goto found;
c85c2951	615	spin_unlock_bh(&ctrl->loop_linkid_lock);
c85c2951	616
b482cd20	617	found:
c85c2951	618	if (linkid < 10)
	619	dec = 0;
	620
b482cd20 SB	621	if (!ctrl->loop_linkused[linkid])
	622	ctrl->loop_linkused[linkid] = 1;
	623
	624	last_linkid = linkid;
	625
	626	cfpkt_add_trail(pkt, &linkid, 1);
c85c2951	627	spin_unlock_bh(&ctrl->loop_linkid_lock);
b482cd20 SB	628	cfpkt_peek_head(pkt, &linktype, 1);
	629	if (linktype == CFCTRL_SRV_UTIL) {
	630	tmp = 0x01;
	631	cfpkt_add_trail(pkt, &tmp, 1);
	632	cfpkt_add_trail(pkt, &tmp, 1);
	633	}
	634	break;
	635
	636	case CFCTRL_CMD_LINK_DESTROY:
c85c2951	637	spin_lock_bh(&ctrl->loop_linkid_lock);
b482cd20 SB	638	cfpkt_peek_head(pkt, &linkid, 1);
b482cd20 SB	639	ctrl->loop_linkused[linkid] = 0;
c85c2951	640	spin_unlock_bh(&ctrl->loop_linkid_lock);
b482cd20 SB	641	break;
	642	default:
	643	break;
	644	}
2aa40aef	645	return 0;
b482cd20 SB	646	}
b482cd20 SB	647	#endif