#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/init.h>

/* We are an ethernet device */
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <net/sock.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include <asm/checksum.h>   /* for ip_fast_csum() */
#include <net/arp.h>
#include <net/dst.h>
#include <linux/proc_fs.h>

/* And atm device */
#include <linux/atmdev.h>
#include <linux/atmlec.h>
#include <linux/atmmpc.h>
/* Modular too */
#include <linux/config.h>
#include <linux/module.h>

#include "lec.h"
#include "mpc.h"
#include "resources.h"  /* for bind_vcc() */

/*
 * mpc.c: Implementation of MPOA client kernel part 
 */

#if 0
#define dprintk printk   /* debug */
#else
#define dprintk(format,args...)
#endif

#if 0
#define ddprintk printk  /* more debug */
#else
#define ddprintk(format,args...)
#endif



#define MPOA_TAG_LEN 4

/* mpc_daemon -> kernel */
static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);

static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
                          uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type);
static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);

static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc);
static void mpoad_close(struct atm_vcc *vcc);
static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);

static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
static void mpc_timer_refresh(void);
static void mpc_cache_check( unsigned long checking_time  );

static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
        0xaa, 0xaa, 0x03,
        {0x00, 0x00, 0x5e},
        {0x00, 0x03}         /* For MPOA control PDUs */
};        
static struct llc_snap_hdr llc_snap_mpoa_data = {
        0xaa, 0xaa, 0x03,
        {0x00, 0x00, 0x00},
        {0x08, 0x00}         /* This is for IP PDUs only */
};        
static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
        0xaa, 0xaa, 0x03,
        {0x00, 0x00, 0x00},
        {0x88, 0x4c}         /* This is for tagged data PDUs */
};        

static struct notifier_block mpoa_notifier = {
        mpoa_event_listener,
        NULL,
        0
};

#ifdef CONFIG_PROC_FS
extern int mpc_proc_init(void);
extern void mpc_proc_clean(void);
#endif

struct mpoa_client *mpcs = NULL; /* FIXME */
static struct atm_mpoa_qos *qos_head = NULL;
static struct timer_list mpc_timer;


static struct mpoa_client *find_mpc_by_itfnum(int itf)
{
        struct mpoa_client *mpc;
        
        mpc = mpcs;  /* our global linked list */
        while (mpc != NULL) {
                if (mpc->dev_num == itf)
                        return mpc;
                mpc = mpc->next;    
        }

        return NULL;   /* not found */
}

static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
{
        struct mpoa_client *mpc;
        
        mpc = mpcs;  /* our global linked list */
        while (mpc != NULL) {
                if (mpc->mpoad_vcc == vcc)
                        return mpc;
                mpc = mpc->next;
        }

        return NULL;   /* not found */
}

static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
{
        struct mpoa_client *mpc;
        
        mpc = mpcs;  /* our global linked list */
        while (mpc != NULL) {
                if (mpc->dev == dev)
                        return mpc;
                mpc = mpc->next;
        }

        return NULL;   /* not found */
}

/*
 * Functions for managing QoS list
 */

/*
 * Overwrites the old entry or makes a new one.
 */
struct atm_mpoa_qos *atm_mpoa_add_qos(uint32_t dst_ip, struct atm_qos *qos)
{
        struct atm_mpoa_qos *entry;

        entry = atm_mpoa_search_qos(dst_ip);
        if (entry != NULL) {
                entry->qos = *qos;
                return entry;
        }

        entry = kmalloc(sizeof(struct atm_qos), GFP_KERNEL);
        if (entry == NULL) {
                printk("mpoa: atm_mpoa_add_qos: out of memory\n");
                return entry;
        }

        entry->ipaddr = dst_ip;
        entry->qos = *qos;

        entry->next = qos_head;
        qos_head = entry;

        return entry;
}

struct atm_mpoa_qos *atm_mpoa_search_qos(uint32_t dst_ip)
{
        struct atm_mpoa_qos *qos;

        qos = qos_head;
        while( qos != NULL ){
                if(qos->ipaddr == dst_ip) {
                        break;
		}
                qos = qos->next;
        }

        return qos;
}        

/*
 * Returns 0 for failure
 */
int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
{

        struct atm_mpoa_qos *curr;

        if (entry == NULL) return 0;
        if (entry == qos_head) {
                qos_head = qos_head->next;
                kfree(entry);
                return 1;
        }

        curr = qos_head;
        while (curr != NULL) {
                if (curr->next == entry) {
                        curr->next = entry->next;
                        kfree(entry);
                        return 1;
                }
                curr = curr->next;
        }

        return 0;
}

void atm_mpoa_disp_qos(char *page, int *len)
{

	unsigned char *ip;
	char ipaddr[16];
	struct atm_mpoa_qos *qos;

	qos = qos_head;
	*len += sprintf(page + *len, "QoS entries for shortcuts:\n");
	*len += sprintf(page + *len, "IP address\n  TX:max_pcr pcr     min_pcr max_cdv max_sdu\n  RX:max_pcr pcr     min_pcr max_cdv max_sdu\n");

	ipaddr[sizeof(ipaddr)-1] = '\0';
	while (qos != NULL) {
		ip = (unsigned char *)&qos->ipaddr;
		sprintf(ipaddr, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
		*len += sprintf(page + *len, "%-16s\n     %-7d %-7d %-7d %-7d %-7d\n     %-7d %-7d %-7d %-7d %-7d\n",
				ipaddr,
				qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
				qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
		qos = qos->next;
	}
	
	return;
}

static struct net_device *find_lec_by_itfnum(int itf)
{
        extern struct atm_lane_ops atm_lane_ops; /* in common.c */
        
        if (atm_lane_ops.get_lecs == NULL)
                return NULL;

        return atm_lane_ops.get_lecs()[itf]; /* FIXME: something better */
}

static struct mpoa_client *alloc_mpc(void)
{
        struct mpoa_client *mpc;

        mpc = kmalloc(sizeof (struct mpoa_client), GFP_KERNEL);
        if (mpc == NULL)
                return NULL;
        memset(mpc, 0, sizeof(struct mpoa_client));
#if 0 /* compiler seems to barf on this */
        mpc->ingress_lock = RW_LOCK_UNLOCKED;
        mpc->egress_lock  = RW_LOCK_UNLOCKED;
#endif
        mpc->next = mpcs;
        atm_mpoa_init_cache(mpc);

	mpc->parameters.mpc_p1 = MPC_P1;
	mpc->parameters.mpc_p2 = MPC_P2;
	memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
	mpc->parameters.mpc_p4 = MPC_P4;
	mpc->parameters.mpc_p5 = MPC_P5; 
	mpc->parameters.mpc_p6 = MPC_P6;
	
        mpcs = mpc;
	
        return mpc;
}

/*
 *
 * start_mpc() puts the MPC on line. All the packets destined
 * to the lec underneath us are now being monitored and 
 * shortcuts will be established.
 *
 */
static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
{
        
        dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name); 
        if (dev->hard_start_xmit == NULL) {
                printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
                       dev->name);
                return;
        }
        mpc->old_hard_start_xmit = dev->hard_start_xmit;
        dev->hard_start_xmit = mpc_send_packet;

        return;
}

static void stop_mpc(struct mpoa_client *mpc)
{
        
        dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name); 

        /* Lets not nullify lec device's dev->hard_start_xmit */
        if (mpc->dev->hard_start_xmit != mpc_send_packet) {
                dprintk(" mpc already stopped, not fatal\n");
                return;
        }
        dprintk("\n");
        mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
        mpc->old_hard_start_xmit = NULL;
	/* close_shortcuts(mpc);    ??? FIXME */
        
        return;
}

static const char * __attribute__ ((unused)) mpoa_device_type_string(char type)
{
        switch(type) {
        case NON_MPOA:
                return "non-MPOA device";
                break;
        case MPS:
                return "MPS";
                break;
        case MPC:
                return "MPC";
                break;
        case MPS_AND_MPC:
                return "both MPS and MPC";
                break;
        default:
                return "unspecified (non-MPOA) device";
                break;
        }

        return ""; /* not reached */
}

/*
 * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
 * when it sees a TLV in LE_ARP packet.
 * We fill in the pointer above when we see a LANE2 lec initializing
 * See LANE2 spec 3.1.5
 *
 * Quite a big and ugly function but when you look at it
 * all it does is to try to locate and parse MPOA Device
 * Type TLV.
 * We give our lec a pointer to this function and when the
 * lec sees a TLV it uses the pointer to call this function.
 *
 */
static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
                            uint8_t *tlvs, uint32_t sizeoftlvs)
{
        uint32_t type;
        uint8_t length, mpoa_device_type, number_of_mps_macs;
        uint8_t *end_of_tlvs;
        struct mpoa_client *mpc;
        
        mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
        dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
        dprintk("total length of all TLVs %d\n", sizeoftlvs);
	mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
        if (mpc == NULL) {
                printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
                return;
        }
        end_of_tlvs = tlvs + sizeoftlvs;
        while (end_of_tlvs - tlvs >= 5) {
                type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
                length = tlvs[4];
                tlvs += 5;
                dprintk("    type 0x%x length %02x\n", type, length);
                if (tlvs + length > end_of_tlvs) {
                        printk("TLV value extends past its buffer, aborting parse\n");
                        return;
                }
                
                if (type == 0) {
                        printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
                        return;
		}

                if (type != TLV_MPOA_DEVICE_TYPE) {
                        tlvs += length;
                        continue;  /* skip other TLVs */
                }
                mpoa_device_type = *tlvs++;
                number_of_mps_macs = *tlvs++;
                dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
                if (mpoa_device_type == MPS_AND_MPC &&
                    length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
                        printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
                               dev->name);
                        continue;
                }
                if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
                    && length < 22 + number_of_mps_macs*ETH_ALEN) {
                        printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
                                dev->name);
                        continue;
                }
                if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
                        dprintk("ignoring non-MPS device\n");
                        if (mpoa_device_type == MPC) tlvs += 20;
                        continue;  /* we are only interested in MPSs */
                }
                if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
                        printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
                        continue;  /* someone should read the spec */
                }
                dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
                
                /* ok, now we can go and tell our daemon the control address of MPS */
                send_set_mps_ctrl_addr(tlvs, mpc);
                
                tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
                if (tlvs == NULL) return;
        }
        if (end_of_tlvs - tlvs != 0)
                printk("mpoa: (%s) lane2_assoc_ind: ignoring %d bytes of trailing TLV carbage\n",
                       dev->name, end_of_tlvs - tlvs);
        return;
}

/*
 * Store at least advertizing router's MAC address
 * plus the possible MAC address(es) to mpc->mps_macs.
 * For a freshly allocated MPOA client mpc->mps_macs == 0.
 */
static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
                          uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
{
        int num_macs;
        num_macs = (mps_macs > 1) ? mps_macs : 1;

        if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
                if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
                mpc->number_of_mps_macs = 0;
                mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
                if (mpc->mps_macs == NULL) {
                        printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
                        return NULL;
                }
        }
        memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
        tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
        if (mps_macs > 0)
                memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
        tlvs += mps_macs*ETH_ALEN;
        mpc->number_of_mps_macs = num_macs;

        return tlvs;
}

/* FIXME: tarvitsee työtä */
static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
{
        in_cache_entry *entry;
        struct iphdr *iph;
        char *buff;
        uint32_t ipaddr = 0;

        static struct {
                struct llc_snap_hdr hdr;
                uint32_t tag;
        } tagged_llc_snap_hdr = {
                {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
                0
        };

        buff = skb->data + mpc->dev->hard_header_len;
        iph = (struct iphdr *)buff;
	ipaddr = iph->daddr;

        ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);        

        entry = mpc->in_ops->search(ipaddr, mpc);
        if (entry == NULL) {
                mpc->in_ops->new_entry(ipaddr, mpc);
                return 1;
        }
        if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){   /* threshold not exceeded or VCC not ready */
                ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);        
                return 1;
        }

        ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);        
        /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
        if (iph->ttl <= 1) {
              ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);        
              return 1;
        }
        iph->ttl--;
        iph->check = 0;
        iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);

        if (entry->ctrl_info.tag != 0) {
                ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
                tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
                skb_pull(skb, ETH_HLEN);                       /* get rid of Eth header */
                skb_push(skb, sizeof(tagged_llc_snap_hdr));    /* add LLC/SNAP header   */
                memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
        } else {
                skb_pull(skb, ETH_HLEN);                        /* get rid of Eth header */
                skb_push(skb, sizeof(struct llc_snap_hdr));     /* add LLC/SNAP header + tag  */
                memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
        }

        atomic_add(skb->truesize, &entry->shortcut->tx_inuse);
	ATM_SKB(skb)->iovcnt = 0; /* just to be safe ... */
	ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
        entry->shortcut->dev->ops->send(entry->shortcut, skb);
	entry->packets_fwded++;

        return 0;
}

/*
 * Probably needs some error checks and locking, not sure...
 */
static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
{
        int retval;
        struct mpoa_client *mpc;
        struct ethhdr *eth;
        int i = 0;
        
        mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
        if(mpc == NULL) {
	        printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
                goto non_ip;
	}

        eth = (struct ethhdr *)skb->data;
        if (eth->h_proto != htons(ETH_P_IP))
                goto non_ip; /* Multi-Protocol Over ATM :-) */

        while (i < mpc->number_of_mps_macs) {
                if (memcmp(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN), ETH_ALEN) == 0)
                        if ( send_via_shortcut(skb, mpc) == 0 )           /* try shortcut */
                                return 0;                                 /* success!     */
                i++;
        }

 non_ip:
        retval = mpc->old_hard_start_xmit(skb,dev);
        
        return retval;
}

int atm_mpoa_vcc_attach(struct atm_vcc *vcc, long arg)
{
        int bytes_left;
        struct mpoa_client *mpc;
        struct atmmpc_ioc ioc_data;
        in_cache_entry *in_entry;
        uint32_t  ipaddr;
	unsigned char *ip;

        bytes_left = copy_from_user(&ioc_data, (void *)arg, sizeof(struct atmmpc_ioc));
        if (bytes_left != 0) {
                printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
                return -EFAULT;
        }
        ipaddr = ioc_data.ipaddr;
        if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
                return -EINVAL;
        
        mpc = find_mpc_by_itfnum(ioc_data.dev_num);
        if (mpc == NULL)
                return -EINVAL;
        
        if (ioc_data.type == MPC_SOCKET_INGRESS) {
                in_entry = mpc->in_ops->search(ipaddr, mpc);
                if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
                        printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
                                mpc->dev->name);
                        return -EINVAL;
                }
		ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
                printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
                       mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
                in_entry->shortcut = vcc;
        } else {
                printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
        }
        
        vcc->proto_data = mpc->dev;
        vcc->push = mpc_push;

        return 0;
}

/*
 *
 */
static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
{
        struct mpoa_client *mpc;
        in_cache_entry *in_entry;
        eg_cache_entry *eg_entry;
        
        mpc = find_mpc_by_lec(dev);
        if (mpc == NULL) {
                printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
                return;
        }

        dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
        in_entry = mpc->in_ops->search_by_vcc(vcc, mpc);
        if (in_entry) {
                unsigned char *ip __attribute__ ((unused)) =
		    (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
	        dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
                       mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
                in_entry->shortcut = NULL;
        }
        eg_entry = mpc->eg_ops->search_by_vcc(vcc, mpc);
        if (eg_entry) {
	        dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
                eg_entry->shortcut = NULL;
        }

        if (in_entry == NULL && eg_entry == NULL)
                dprintk("mpoa: (%s) mpc_vcc_close:  unused vcc closed\n", dev->name);

        return;
}

static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
{
        struct net_device *dev = (struct net_device *)vcc->proto_data;
        struct sk_buff *new_skb;
        eg_cache_entry *eg;
        struct mpoa_client *mpc;
	uint32_t tag;
        char *tmp;
        
        ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
        if (skb == NULL) {
                dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
                mpc_vcc_close(vcc, dev);
                return;
        }
        
        skb->dev = dev;
        if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
                dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
                skb_queue_tail(&vcc->recvq, skb);           /* Pass control packets to daemon */
                wake_up(&vcc->sleep);
                return;
        }

        /* data coming over the shortcut */
        atm_return(vcc, skb->truesize);

	mpc = find_mpc_by_lec(dev);
        if (mpc == NULL) {
                printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
                return;
        }

        if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
                ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);

        } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
                printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
                printk("           mpc_push: non-tagged data unsupported, purging\n");
		kfree_skb(skb);
                return;
        } else {
                printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
		kfree_skb(skb);
                return;
        }

        tmp = skb->data + sizeof(struct llc_snap_hdr);
        tag = *(uint32_t *)tmp;

        eg = mpc->eg_ops->search_by_tag(tag, mpc);
        if (eg == NULL) {
                printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
                       dev->name,tag);
                purge_egress_shortcut(vcc, NULL);
                kfree_skb(skb);
                return;
        }
        
        /*
         * See if ingress MPC is using shortcut we opened as a return channel.
         * This means we have a bi-directional vcc opened by us.
         */ 
        if (eg->shortcut == NULL) {
                eg->shortcut = vcc;
                printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
        }

        skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
        new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
        kfree_skb(skb);
        if (new_skb == NULL) return;
        skb_push(new_skb, eg->ctrl_info.DH_length);     /* add MAC header */
        memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
        new_skb->protocol = eth_type_trans(new_skb, dev);
        new_skb->nh.raw = new_skb->data;

	eg->latest_ip_addr = new_skb->nh.iph->saddr;
        eg->packets_rcvd++;
                
        netif_rx(new_skb);

        return;
}

static struct atmdev_ops mpc_ops = { /* only send is required */
        close:	mpoad_close,
        send:	msg_from_mpoad
};

static struct atm_dev mpc_dev = {
        &mpc_ops,       /* device operations    */
        NULL,           /* PHY operations       */
        "mpc",          /* device type name     */
        42,             /* device index (dummy) */
        NULL,           /* VCC table            */
        NULL,           /* last VCC             */
        NULL,           /* per-device data      */
        NULL,           /* private PHY data     */
        0,              /* device flags         */
        NULL,           /* local ATM address    */
        { 0 }           /* no ESI               */
        /* rest of the members will be 0 */
};

int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
{
        struct mpoa_client *mpc;
        struct lec_priv *priv;
        
        if (mpcs == NULL) {
                init_timer(&mpc_timer);
                mpc_timer_refresh();

                /* This lets us now how our LECs are doing */
                register_netdevice_notifier(&mpoa_notifier);
        }
        
        mpc = find_mpc_by_itfnum(arg);
        if (mpc == NULL) {
                dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
                mpc = alloc_mpc();
                mpc->dev_num = arg;
                mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
        }
        if (mpc->mpoad_vcc) {
                printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
                return -EADDRINUSE;
        }

        if (mpc->dev) { /* check if the lec is LANE2 capable */
                priv = (struct lec_priv *)mpc->dev->priv;
                if (priv->lane_version < 2)
                        mpc->dev = NULL;
		else
                        priv->lane2_ops->associate_indicator = lane2_assoc_ind;  
        }

        mpc->mpoad_vcc = vcc;
        bind_vcc(vcc, &mpc_dev);
        vcc->flags |= ATM_VF_READY | ATM_VF_META;

        if (mpc->dev) {
                char empty[ATM_ESA_LEN];
                memset(empty, 0, ATM_ESA_LEN);
                
                start_mpc(mpc, mpc->dev);
                /* set address if mpcd e.g. gets killed and restarted.
                 * If we do not do it now we have to wait for the next LE_ARP
                 */
                if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
                        send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
        }

        MOD_INC_USE_COUNT;
        return arg;
}

static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
{
        struct k_message mesg;

        memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
        
        mesg.type = SET_MPS_CTRL_ADDR;
        memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
        msg_to_mpoad(&mesg, mpc);

        return;
}

static void mpoad_close(struct atm_vcc *vcc)
{
        unsigned long flags;
        struct mpoa_client *mpc;
        struct sk_buff *skb;

        mpc = find_mpc_by_vcc(vcc);
        if (mpc == NULL) {
                printk("mpoa: mpoad_close: did not find MPC\n");
                return;
        }
        if (!mpc->mpoad_vcc) {
                printk("mpoa: mpoad_close: close for non-present mpoad\n");
                return;
        }
        
        mpc->mpoad_vcc = NULL;
        if (mpc->dev) {
                struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
                priv->lane2_ops->associate_indicator = NULL;
                stop_mpc(mpc);
        }

        /* clear the caches */
        write_lock_irqsave(&mpc->ingress_lock, flags);
        while(mpc->in_ops->cache_remove(mpc->in_cache, mpc));
        write_unlock_irqrestore(&mpc->ingress_lock, flags);

        write_lock_irqsave(&mpc->egress_lock, flags);
        while(mpc->eg_ops->cache_remove(mpc->eg_cache, mpc));
        write_unlock_irqrestore(&mpc->egress_lock, flags);

	while ( (skb = skb_dequeue(&vcc->recvq)) ){
                atm_return(vcc, skb->truesize);
                kfree_skb(skb);
        }
        
        printk("mpoa: (%s) going down\n",
                (mpc->dev) ? mpc->dev->name : "<unknown>");
        MOD_DEC_USE_COUNT;

        return;
}

/*
 *
 */
static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
{
        
        struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
        struct k_message *mesg = (struct k_message*)skb->data;
        atomic_sub(skb->truesize+ATM_PDU_OVHD, &vcc->tx_inuse);
        
        if (mpc == NULL) {
                printk("mpoa: msg_from_mpoad: no mpc found\n");
                return 0;
        }
        dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
        switch(mesg->type) {
        case MPOA_RES_REPLY_RCVD:
	        dprintk(" mpoa_res_reply_rcvd\n");
                MPOA_res_reply_rcvd(mesg, mpc);
                break;
        case MPOA_TRIGGER_RCVD:
	        dprintk(" mpoa_trigger_rcvd\n");
                MPOA_trigger_rcvd(mesg, mpc);
                break;
        case INGRESS_PURGE_RCVD:
                dprintk(" nhrp_purge_rcvd\n");
                ingress_purge_rcvd(mesg, mpc);
                break;
        case EGRESS_PURGE_RCVD:
	        dprintk(" egress_purge_reply_rcvd\n");
                egress_purge_rcvd(mesg, mpc);
                break;
        case MPS_DEATH:
	        dprintk(" mps_death\n");
                mps_death(mesg, mpc);
                break;
        case CACHE_IMPOS_RCVD:
	        dprintk(" cache_impos_rcvd\n");
                MPOA_cache_impos_rcvd(mesg, mpc);
                break;
        case SET_MPC_CTRL_ADDR:
                dprintk(" set_mpc_ctrl_addr\n");
                set_mpc_ctrl_addr_rcvd(mesg, mpc);
                break;
	case SET_MPS_MAC_ADDR:
	        dprintk(" set_mps_mac_addr\n");
		set_mps_mac_addr_rcvd(mesg, mpc);
		break;
	case CLEAN_UP_AND_EXIT:
                dprintk(" clean_up_and_exit\n");
                clean_up(mesg, mpc, DIE);
                break;
        case RELOAD:
                dprintk(" reload\n");
                clean_up(mesg, mpc, RELOAD);
                break;
        case SET_MPC_PARAMS:
                dprintk(" set_mpc_params\n");
                mpc->parameters = mesg->content.params;
                break;
        default:
                dprintk(" unknown message %d\n", mesg->type);
                break;
        }
        kfree_skb(skb);

        return 0;
}

int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
{
        struct sk_buff *skb;

        if (mpc == NULL || !mpc->mpoad_vcc) {
                printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
                return -ENXIO;
        }

        skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
        if (skb == NULL)
                return -ENOMEM;
        skb_put(skb, sizeof(struct k_message));
        memcpy(skb->data, mesg, sizeof(struct k_message));
        atm_force_charge(mpc->mpoad_vcc, skb->truesize);
        skb_queue_tail(&mpc->mpoad_vcc->recvq, skb);
        wake_up(&mpc->mpoad_vcc->sleep);

        return 0;
}

static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
{
        struct net_device *dev;
        struct mpoa_client *mpc;
        struct lec_priv *priv;

        dev = (struct net_device *)dev_ptr;
        if (dev->name == NULL || strncmp(dev->name, "lec", 3))
                return NOTIFY_DONE; /* we are only interested in lec:s */
        
        switch (event) {
        case NETDEV_REGISTER:       /* a new lec device was allocated */
                priv = (struct lec_priv *)dev->priv;
                if (priv->lane_version < 2)
                        break;
                priv->lane2_ops->associate_indicator = lane2_assoc_ind;
                mpc = find_mpc_by_itfnum(priv->itfnum);
                if (mpc == NULL) {
                        dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
                               dev->name);
                        mpc = alloc_mpc();
                        if (mpc == NULL) {
                                printk("mpoa: mpoa_event_listener: no new mpc");
                                break;
                        }
                }
                mpc->dev_num = priv->itfnum;
                mpc->dev = dev;
                dprintk("mpoa: (%s) was initialized\n", dev->name);
                break;
        case NETDEV_UNREGISTER:
                /* the lec device was deallocated */
                mpc = find_mpc_by_lec(dev);
                if (mpc == NULL)
                        break;
                dprintk("mpoa: device (%s) was deallocated\n", dev->name);
                stop_mpc(mpc);
                mpc->dev = NULL;
                break;
        case NETDEV_UP:
                /* the dev was ifconfig'ed up */
                mpc = find_mpc_by_lec(dev);
                if (mpc == NULL)
                        break;
                if (mpc->mpoad_vcc != NULL) {
                        start_mpc(mpc, dev);
                }
                break;
        case NETDEV_DOWN:
                /* the dev was ifconfig'ed down */
                /* this means dev->start == 0 and
                 * the flow of packets from the
                 * upper layer stops
                 */
                mpc = find_mpc_by_lec(dev);
                if (mpc == NULL)
                        break;
                if (mpc->mpoad_vcc != NULL) {
                        stop_mpc(mpc);
                }
                break;
        case NETDEV_REBOOT:
        case NETDEV_CHANGE:
        case NETDEV_CHANGEMTU:
        case NETDEV_CHANGEADDR:
        case NETDEV_GOING_DOWN:
                break;
        default:
                break;
        }

        return NOTIFY_DONE;
}

/*
 * Functions which are called after a message is received from mpcd.
 * Msg is reused on purpose.
 */


static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *client)
{
        uint32_t dst_ip = msg->content.in_info.in_dst_ip;
        in_cache_entry *entry;

	entry = client->in_ops->search(dst_ip, client);
        if( entry == NULL ){
                entry = client->in_ops->new_entry(dst_ip, client);
                entry->entry_state = INGRESS_RESOLVING;
		msg->type = SND_MPOA_RES_RQST;
                msg->content.in_info = entry->ctrl_info;
		msg_to_mpoad(msg,client);
		do_gettimeofday(&(entry->reply_wait));
		return;
        }
        
        if( entry->entry_state == INGRESS_INVALID ){
                entry->entry_state = INGRESS_RESOLVING;
		msg->type = SND_MPOA_RES_RQST;
                msg->content.in_info = entry->ctrl_info;
		msg_to_mpoad(msg,client);
		do_gettimeofday(&(entry->reply_wait));
                return;
        }
        
        printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
                (client->dev) ? client->dev->name : "<unknown>");
	return;
}

/*
 * Things get complicated because we have to check if there's an egress
 * shortcut with suitable traffic parameters we could use. 
 */
static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry){
        uint32_t dst_ip = msg->content.in_info.in_dst_ip;
        unsigned char *ip __attribute__ ((unused)) = (unsigned char *)&dst_ip;
	struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
	eg_cache_entry *eg_entry = client->eg_ops->search_by_src_ip(dst_ip, client);
	if(eg_entry && eg_entry->shortcut){
	        if(eg_entry->shortcut->qos.txtp.traffic_class &
		   msg->qos.txtp.traffic_class &
		   (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
		            if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
			            entry->shortcut = eg_entry->shortcut;
			    else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
			            entry->shortcut = eg_entry->shortcut;
		}
	 	if(entry->shortcut){
		        dprintk("mpoa: (%s) using egress SVC to reach %d.%d.%d.%d\n",client->dev->name, ip[0], ip[1], ip[2], ip[3]);
			return;
		}
	}
	/* No luck in the egress cache we must open an ingress SVC */
	msg->type = OPEN_INGRESS_SVC;
	if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
	{
	        msg->qos = qos->qos;
		printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
    	}
	else memset(&msg->qos,0,sizeof(struct atm_qos));
	msg_to_mpoad(msg, client);
	return;
}

static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *client)
{
	unsigned char *ip;

        uint32_t dst_ip = msg->content.in_info.in_dst_ip;
        in_cache_entry *entry = client->in_ops->search(dst_ip, client);
	ip = (unsigned char *)&dst_ip;
        dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %d.%d.%d.%d\n", client->dev->name, ip[0], ip[1], ip[2], ip[3]);
        ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", client->dev->name, entry);
        if(entry == NULL){
                printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", client->dev->name);
                return;
        }
        ddprintk(" entry_state = %d ", entry->entry_state);	

        if (entry->entry_state == INGRESS_RESOLVED) {
                printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", client->dev->name);
                return;
        }

        entry->ctrl_info = msg->content.in_info;
        do_gettimeofday(&(entry->tv));
        do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
        entry->refresh_time = 0;
        ddprintk("entry->shortcut = %p\n", entry->shortcut);

	if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
	        entry->entry_state = INGRESS_RESOLVED; 
		return; /* Shortcut already open... */
	}

	if (entry->shortcut != NULL) {
		printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
		       client->dev->name);
		return;
	}
	
	check_qos_and_open_shortcut(msg, client, entry);
	entry->entry_state = INGRESS_RESOLVED;

	return;

}

static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
{
        uint32_t dst_ip = msg->content.in_info.in_dst_ip;
        uint32_t mask = msg->ip_mask;
	unsigned char *ip = (unsigned char *)&dst_ip;

        in_cache_entry *entry = mpc->in_ops->search_with_mask(dst_ip, mpc, mask);
        if( entry == NULL ){
                printk("mpoa: (%s) ingress_purge_rcvd: recieved a purge for an entry that doesn't exist, ", mpc->dev->name);
                printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
                return;
        }
	while(entry != NULL){
	        dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
		       mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
		mpc->in_ops->cache_remove(entry, mpc);
		entry = mpc->in_ops->search_with_mask(dst_ip, mpc, mask);
	}
        return;
} 

static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
{
        unsigned long flags;
        uint32_t cache_id = msg->content.eg_info.cache_id;
        eg_cache_entry *entry = mpc->eg_ops->search_by_cache_id(cache_id, mpc);
        
        if( entry == NULL ){
                printk("mpoa: (%s) egress_purge_rcvd: received a purge reply for an entry that doesn't exist\n", mpc->dev->name);
                return;
        }

        write_lock_irqsave(&mpc->egress_lock, flags);
        mpc->eg_ops->cache_remove(entry, mpc);
        write_unlock_irqrestore(&mpc->egress_lock, flags);

        return;
} 

static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
{
        struct k_message *purge_msg;
        struct sk_buff *skb;

        dprintk("mpoa: purge_egress_shortcut: entering\n");
        if (vcc == NULL) {
                printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
                return;
        }

        skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
        if (skb == NULL) {
                 printk("mpoa: purge_egress_shortcut: out of memory\n");
                return;
        }

        skb_put(skb, sizeof(struct k_message));
        memset(skb->data, 0, sizeof(struct k_message));
        purge_msg = (struct k_message *)skb->data;
        purge_msg->type = DATA_PLANE_PURGE;
        if (entry != NULL)
                purge_msg->content.eg_info = entry->ctrl_info;

        atm_force_charge(vcc, skb->truesize);
        skb_queue_tail(&vcc->recvq, skb);
        wake_up(&vcc->sleep);
        dprintk("mpoa: purge_egress_shortcut: exiting:\n");

        return;
}

/*
 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
 * of the egress shortcuts we have.
 */
static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
{

        unsigned long flags;
        eg_cache_entry *entry;

        dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);

        if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
                printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
                return;
        }

        entry = mpc->eg_cache;
        while (entry != NULL) {
                purge_egress_shortcut(entry->shortcut, entry);
                entry = entry->next;
        }

        write_lock_irqsave(&mpc->ingress_lock, flags);
        while(mpc->in_ops->cache_remove(mpc->in_cache, mpc));
        write_unlock_irqrestore(&mpc->ingress_lock, flags);

        write_lock_irqsave(&mpc->egress_lock, flags);
        while(mpc->eg_ops->cache_remove(mpc->eg_cache, mpc));
        write_unlock_irqrestore(&mpc->egress_lock, flags);

        return;
}

static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc){

        uint16_t holding_time;
        unsigned long flags;
        eg_cache_entry *entry = mpc->eg_ops->search_by_cache_id(msg->content.eg_info.cache_id, mpc);
        
        holding_time = msg->content.eg_info.holding_time;
        dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
               mpc->dev->name, entry, holding_time);
        if(entry == NULL && holding_time) {
                mpc->eg_ops->new_entry(msg, mpc);
                return;
        }
        if(holding_time){
                mpc->eg_ops->update(entry, holding_time);
                return;
        }
        
        write_lock_irqsave(&mpc->egress_lock, flags);
        mpc->eg_ops->cache_remove(entry, mpc);
        write_unlock_irqrestore(&mpc->egress_lock, flags);

        
        return;
}

static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
{
        struct lec_priv *priv;
        int i, retval ;

        uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];

        tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type  */
        tlv[4] = 1 + 1 + ATM_ESA_LEN;  /* length                           */
        tlv[5] = 0x02;                 /* MPOA client                      */
        tlv[6] = 0x00;                 /* number of MPS MAC addresses      */

        memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
        memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);

        dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
               (mpc->dev) ? mpc->dev->name : "<unknown>");
        for (i = 7; i < sizeof(tlv); i++)
                dprintk("%02x ", tlv[i]);
        dprintk("\n");

        if (mpc->dev) {
                priv = (struct lec_priv *)mpc->dev->priv;
                retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
                if (retval == 0)
                        printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
                retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
                if (retval < 0)
                        printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
        }

        return;
}

static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client){

        if(client->number_of_mps_macs)
                kfree(client->mps_macs);
        client->number_of_mps_macs = 0;
	client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL);
        if (client->mps_macs == NULL) {
	        printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
                return;
        }
	client->number_of_mps_macs = 1;
	memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
	
	return;
}

/*
 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
 */
static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action){

        unsigned long flags;
        eg_cache_entry *entry;
	msg->type = SND_EGRESS_PURGE;


        read_lock_irqsave(&mpc->egress_lock, flags);
        entry = mpc->eg_cache;
	while(entry != NULL){
	            msg->content.eg_info = entry->ctrl_info;
                    dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
		    msg_to_mpoad(msg, mpc);
		    entry = entry->next;
	}
        read_unlock_irqrestore(&mpc->egress_lock, flags);

	msg->type = action;
	msg_to_mpoad(msg, mpc);
	return;
}

static void mpc_timer_refresh()
{
        mpc_timer.expires = jiffies + (MPC_P2 * HZ);
        mpc_timer.data = mpc_timer.expires;
        mpc_timer.function = mpc_cache_check;
        add_timer(&mpc_timer);
        
        return;
}

static void mpc_cache_check( unsigned long checking_time  )
{
        struct mpoa_client *mpc = mpcs;
        static unsigned long previous_resolving_check_time = 0;
        static unsigned long previous_refresh_time = 0;
        
        while( mpc != NULL ){
                mpc->in_ops->clear_count(mpc);
		mpc->eg_ops->clear_expired(mpc);
                if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
                        mpc->in_ops->check_resolving(mpc);
                        previous_resolving_check_time = checking_time;
                }
                if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
                        mpc->in_ops->refresh(mpc);
                        previous_refresh_time = checking_time;
                }
                mpc = mpc->next;
        }
        mpc_timer_refresh();
        
        return;
}

void atm_mpoa_init_ops(struct atm_mpoa_ops *ops)
{
        ops->mpoad_attach = atm_mpoa_mpoad_attach;
        ops->vcc_attach = atm_mpoa_vcc_attach;

#ifdef CONFIG_PROC_FS
	if(mpc_proc_init() != 0)
	        printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
	else
	        printk(KERN_INFO "mpoa: /proc/mpoa initialized\n");
#endif

        printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");

        return;
}

#ifdef MODULE
int init_module(void)
{
        extern struct atm_mpoa_ops atm_mpoa_ops;

	atm_mpoa_init_ops(&atm_mpoa_ops);

        return 0;
}

void cleanup_module(void)
{
        extern struct atm_mpoa_ops atm_mpoa_ops;
        struct mpoa_client *mpc, *tmp;
        struct atm_mpoa_qos *qos, *nextqos;
        struct lec_priv *priv;

        if (MOD_IN_USE) {
                printk("mpc.c: module in use\n");
                return;
        }
#ifdef CONFIG_PROC_FS
	mpc_proc_clean();
#endif

        del_timer(&mpc_timer);
        unregister_netdevice_notifier(&mpoa_notifier);
        atm_mpoa_ops.mpoad_attach = NULL;
        atm_mpoa_ops.vcc_attach = NULL;

        mpc = mpcs;
        mpcs = NULL;
        while (mpc != NULL) {
                tmp = mpc->next;
                if (mpc->dev != NULL) {
                        stop_mpc(mpc);
                        priv = (struct lec_priv *)mpc->dev->priv;
                        if (priv->lane2_ops != NULL)
                                priv->lane2_ops->associate_indicator = NULL;
                }
                ddprintk("mpoa: cleanup_module: about to clear caches\n");
                while(mpc->in_ops->cache_remove(mpc->in_cache, mpc));
                while(mpc->eg_ops->cache_remove(mpc->eg_cache, mpc));        
                ddprintk("mpoa: cleanup_module: caches cleared\n");
                kfree(mpc->mps_macs);
                memset(mpc, 0, sizeof(struct mpoa_client));
                ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
                kfree(mpc);
                ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
                mpc = tmp;
        }

        qos = qos_head;
        qos_head = NULL;
        while (qos != NULL) {
                nextqos = qos->next;
                dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
                kfree(qos);
                qos = nextqos;
        }

        return;
}
#endif /* MODULE */
