lec.c

嵌入式系统设计与实例开发实验教材二源码 多线程应用程序设计 串行端口程序设计 AD接口实验 CAN总线通信实验 GPS通信实验 Linux内核移植与编译实验 IC卡读写实验 SD驱动使

                atomic_add(skb->truesize, &send_vcc->tx_inuse);
                priv->stats.tx_packets++;
                priv->stats.tx_bytes += skb->len;
                send_vcc->send(send_vcc, skb);
        } else {
                priv->stats.tx_dropped++;
                dev_kfree_skb(skb);
	}

#if 0
        /* Should we wait for card's device driver to notify us? */
        dev->tbusy=0;
#endif        
        return 0;
}

/* The inverse routine to net_open(). */
static int 
lec_close(struct net_device *dev) 
{
        netif_stop_queue(dev);
        return 0;
}

/*
 * Get the current statistics.
 * This may be called with the card open or closed.
 */
static struct net_device_stats *
lec_get_stats(struct net_device *dev)
{
        return &((struct lec_priv *)dev->priv)->stats;
}

static int 
lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
        struct net_device *dev = (struct net_device*)vcc->proto_data;
        struct lec_priv *priv = (struct lec_priv*)dev->priv;
        struct atmlec_msg *mesg;
        struct lec_arp_table *entry;
        int i;
        char *tmp; /* FIXME */

	atomic_sub(skb->truesize+ATM_PDU_OVHD, &vcc->tx_inuse);
        mesg = (struct atmlec_msg *)skb->data;
        tmp = skb->data;
        tmp += sizeof(struct atmlec_msg);
        DPRINTK("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
        switch(mesg->type) {
        case l_set_mac_addr:
                for (i=0;i<6;i++) {
                        dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
                }    
                break;
        case l_del_mac_addr:
                for(i=0;i<6;i++) {
                        dev->dev_addr[i] = 0;
                }
                break;
        case l_addr_delete:
                lec_addr_delete(priv, mesg->content.normal.atm_addr, 
                                mesg->content.normal.flag);
                break;
        case l_topology_change:
                priv->topology_change = mesg->content.normal.flag;  
                break;
        case l_flush_complete:
                lec_flush_complete(priv, mesg->content.normal.flag);
                break;
        case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
                entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
                lec_arp_remove(priv->lec_arp_tables, entry);

                if (mesg->content.normal.no_source_le_narp)
                        break;
                /* FALL THROUGH */
        case l_arp_update:
                lec_arp_update(priv, mesg->content.normal.mac_addr,
                               mesg->content.normal.atm_addr,
                               mesg->content.normal.flag,
                               mesg->content.normal.targetless_le_arp);
                DPRINTK("lec: in l_arp_update\n");
                if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
                        DPRINTK("lec: LANE2 3.1.5, got tlvs, size %d\n", mesg->sizeoftlvs);
                        lane2_associate_ind(dev,
                                            mesg->content.normal.mac_addr,
                                            tmp, mesg->sizeoftlvs);
                }
                break;
        case l_config:
                priv->maximum_unknown_frame_count = 
                        mesg->content.config.maximum_unknown_frame_count;
                priv->max_unknown_frame_time = 
                        (mesg->content.config.max_unknown_frame_time*HZ);
                priv->max_retry_count = 
                        mesg->content.config.max_retry_count;
                priv->aging_time = (mesg->content.config.aging_time*HZ);
                priv->forward_delay_time = 
                        (mesg->content.config.forward_delay_time*HZ);
                priv->arp_response_time = 
                        (mesg->content.config.arp_response_time*HZ);
                priv->flush_timeout = (mesg->content.config.flush_timeout*HZ);
                priv->path_switching_delay = 
                        (mesg->content.config.path_switching_delay*HZ);
                priv->lane_version = mesg->content.config.lane_version; /* LANE2 */
		priv->lane2_ops = NULL;
		if (priv->lane_version > 1)
			priv->lane2_ops = &lane2_ops;
		if (dev->change_mtu(dev, mesg->content.config.mtu))
			printk("%s: change_mtu to %d failed\n", dev->name,
			    mesg->content.config.mtu);
		priv->is_proxy = mesg->content.config.is_proxy;
                break;
        case l_flush_tran_id:
                lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
                                      mesg->content.normal.flag);
                break;
        case l_set_lecid:
                priv->lecid=(unsigned short)(0xffff&mesg->content.normal.flag);
                break;
        case l_should_bridge: {
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
                struct net_bridge_fdb_entry *f;

                DPRINTK("%s: bridge zeppelin asks about 0x%02x:%02x:%02x:%02x:%02x:%02x\n",
                        dev->name,
                        mesg->content.proxy.mac_addr[0], mesg->content.proxy.mac_addr[1],
                        mesg->content.proxy.mac_addr[2], mesg->content.proxy.mac_addr[3],
                        mesg->content.proxy.mac_addr[4], mesg->content.proxy.mac_addr[5]);

                if (br_fdb_get_hook == NULL || dev->br_port == NULL)
                        break;

                f = br_fdb_get_hook(dev->br_port->br, mesg->content.proxy.mac_addr);
                if (f != NULL &&
                    f->dst->dev != dev &&
                    f->dst->state == BR_STATE_FORWARDING) {
                                /* hit from bridge table, send LE_ARP_RESPONSE */
                        struct sk_buff *skb2;

                        DPRINTK("%s: entry found, responding to zeppelin\n", dev->name);
                        skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
                        if (skb2 == NULL) {
                                br_fdb_put_hook(f);
                                break;
                        }
                        skb2->len = sizeof(struct atmlec_msg);
                        memcpy(skb2->data, mesg, sizeof(struct atmlec_msg));
                        atm_force_charge(priv->lecd, skb2->truesize);
                        skb_queue_tail(&priv->lecd->recvq, skb2);
                        wake_up(&priv->lecd->sleep);
                }
                if (f != NULL) br_fdb_put_hook(f);
#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
                }
                break;
        default:
                printk("%s: Unknown message type %d\n", dev->name, mesg->type);
                dev_kfree_skb(skb);
                return -EINVAL;
        }
        dev_kfree_skb(skb);
        return 0;
}

static void 
lec_atm_close(struct atm_vcc *vcc)
{
        struct sk_buff *skb;
        struct net_device *dev = (struct net_device *)vcc->proto_data;
        struct lec_priv *priv = (struct lec_priv *)dev->priv;

        priv->lecd = NULL;
        /* Do something needful? */

        netif_stop_queue(dev);
        lec_arp_destroy(priv);

        if (skb_peek(&vcc->recvq))
		printk("%s lec_atm_close: closing with messages pending\n",
                       dev->name);
        while ((skb = skb_dequeue(&vcc->recvq))) {
                atm_return(vcc, skb->truesize);
		dev_kfree_skb(skb);
        }
  
	printk("%s: Shut down!\n", dev->name);
        MOD_DEC_USE_COUNT;
}

static struct atmdev_ops lecdev_ops = {
        close:	lec_atm_close,
        send:	lec_atm_send
};

static struct atm_dev lecatm_dev = {
        &lecdev_ops,
        NULL,	    /*PHY*/
        "lec",	    /*type*/
        999,	    /*dummy device number*/
        NULL,NULL,  /*no VCCs*/
        NULL,NULL,  /*no data*/
        { 0 },	    /*no flags*/
        NULL,	    /* no local address*/
        { 0 }	    /*no ESI or rest of the atm_dev struct things*/
};

/*
 * LANE2: new argument struct sk_buff *data contains
 * the LE_ARP based TLVs introduced in the LANE2 spec
 */
int 
send_to_lecd(struct lec_priv *priv, atmlec_msg_type type, 
             unsigned char *mac_addr, unsigned char *atm_addr,
             struct sk_buff *data)
{
	struct sk_buff *skb;
	struct atmlec_msg *mesg;

	if (!priv || !priv->lecd) {
		return -1;
	}
	skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
	if (!skb)
		return -1;
	skb->len = sizeof(struct atmlec_msg);
	mesg = (struct atmlec_msg *)skb->data;
        memset(mesg, 0, sizeof(struct atmlec_msg));
	mesg->type = type;
        if (data != NULL)
                mesg->sizeoftlvs = data->len;
	if (mac_addr)
		memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
        else
                mesg->content.normal.targetless_le_arp = 1;
	if (atm_addr)
		memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);

        atm_force_charge(priv->lecd, skb->truesize);
	skb_queue_tail(&priv->lecd->recvq, skb);
        wake_up(&priv->lecd->sleep);

        if (data != NULL) {
                DPRINTK("lec: about to send %d bytes of data\n", data->len);
                atm_force_charge(priv->lecd, data->truesize);
                skb_queue_tail(&priv->lecd->recvq, data);
                wake_up(&priv->lecd->sleep);
        }

        return 0;
}

/* shamelessly stolen from drivers/net/net_init.c */
static int lec_change_mtu(struct net_device *dev, int new_mtu)
{
        if ((new_mtu < 68) || (new_mtu > 18190))
                return -EINVAL;
        dev->mtu = new_mtu;
        return 0;
}

static void 
lec_init(struct net_device *dev)
{
        dev->change_mtu = lec_change_mtu;
        dev->open = lec_open;
        dev->stop = lec_close;
        dev->hard_start_xmit = lec_send_packet;

        dev->get_stats = lec_get_stats;
        dev->set_multicast_list = NULL;
        dev->do_ioctl  = NULL;
        printk("%s: Initialized!\n",dev->name);
        return;
}

static unsigned char lec_ctrl_magic[] = {
        0xff,
        0x00,
        0x01,
        0x01 };

void 
lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
{
        struct net_device *dev = (struct net_device *)vcc->proto_data;
        struct lec_priv *priv = (struct lec_priv *)dev->priv; 

#if DUMP_PACKETS >0
        int i=0;
        char buf[300];

        printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
               vcc->vpi, vcc->vci);
#endif
        if (!skb) {
                DPRINTK("%s: null skb\n",dev->name);
                lec_vcc_close(priv, vcc);
                return;
        }
#if DUMP_PACKETS > 0
        printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
               skb->len, priv->lecid);
#if DUMP_PACKETS >= 2
        for(i=0;i<skb->len && i <99;i++) {
                sprintf(buf+i*3,"%2.2x ",0xff&skb->data[i]);
        }
#elif DUMP_PACKETS >= 1
        for(i=0;i<skb->len && i < 30;i++) {
                sprintf(buf+i*3,"%2.2x ", 0xff&skb->data[i]);
        }
#endif /* DUMP_PACKETS >= 1 */
        if (i==skb->len)
                printk("%s\n",buf);
        else
                printk("%s...\n",buf);
#endif /* DUMP_PACKETS > 0 */
        if (memcmp(skb->data, lec_ctrl_magic, 4) ==0) { /* Control frame, to daemon*/
                DPRINTK("%s: To daemon\n",dev->name);
                skb_queue_tail(&vcc->recvq, skb);
                wake_up(&vcc->sleep);
        } else { /* Data frame, queue to protocol handlers */
                unsigned char *dst;

                atm_return(vcc,skb->truesize);
                if (*(uint16_t *)skb->data == htons(priv->lecid) ||
                    !priv->lecd) { 
                        /* Probably looping back, or if lecd is missing,
                           lecd has gone down */
                        DPRINTK("Ignoring loopback frame...\n");
                        dev_kfree_skb(skb);
                        return;
                }
#ifdef CONFIG_TR
                if (priv->is_trdev) dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
                else
#endif
                dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;

                if (!(dst[0]&0x01) &&   /* Never filter Multi/Broadcast */
                    !priv->is_proxy &&  /* Proxy wants all the packets */
		    memcmp(dst, dev->dev_addr, dev->addr_len)) {
                        dev_kfree_skb(skb);
                        return;
                }
                if (priv->lec_arp_empty_ones) {
                        lec_arp_check_empties(priv, vcc, skb);
                }
                skb->dev = dev;
                skb->data += 2; /* skip lec_id */
#ifdef CONFIG_TR
                if (priv->is_trdev) skb->protocol = tr_type_trans(skb, dev);
                else
#endif
                skb->protocol = eth_type_trans(skb, dev);
                priv->stats.rx_packets++;
                priv->stats.rx_bytes += skb->len;
                netif_rx(skb);
        }
}

int