request_irq(netdev->irq,?&e1000_intr,?...);

static?int?__init?net_dev_init(void)?{
????open_softirq(NET_TX_SOFTIRQ,?net_tx_action,?NULL);
????open_softirq(NET_RX_SOFTIRQ,?net_rx_action,?NULL);
}

//?transmit?發(fā)送
static?void?net_tx_action(struct?softirq_action?*h)?{...}
//?receive?接收
static?void?net_rx_action(struct?softirq_action?*h)?{...}

static?void?net_rx_action(struct?softirq_action?*h)?{
????struct?softnet_data?*queue?=?&__get_cpu_var(softnet_data);???
????while?(!list_empty(&queue->poll_list))?{
????????struct?net_device?dev?=?list_entry(
????????????queue->poll_list.next,?struct?net_device,?poll_list);
??????? dev->poll(dev, &budget)；
????}
}

netdev->poll?=?&e1000_clean;

static?int?e1000_clean(struct?net_device?*netdev,?int?*budget)?{
????struct?e1000_adapter?*adapter?=?netdev->priv;????
????e1000_clean_tx_irq(adapter);
????e1000_clean_rx_irq(adapter,?&work_done,?work_to_do);
}

//?drivers\net\e1000\e1000_main.c
e1000_clean_rx_irq(struct?e1000_adapter?*adapter)?{
????...
????netif_receive_skb(skb);
????...
}

//?net\core\dev.c
int?netif_receive_skb(struct?sk_buff?*skb)?{
????...
????list_for_each_entry_rcu(ptype,?&ptype_base[ntohs(type)&15],?list)?{
????????...
????????deliver_skb(skb,?ptype,?0);
????????...
????}
????...
}

static?__inline__?int?deliver_skb(
????????struct?sk_buff?*skb,?struct?packet_type?*pt_prev,?int?last)?{
????...
????return?pt_prev->func(skb,?skb->dev,?pt_prev);
}

//?net\ipv4\ip_output.c
static?struct?packet_type?ip_packet_type?=?{
????.type?=?__constant_htons(ETH_P_IP),
????.func?=?ip_rcv,
};

void?__init?ip_init(void)?{
????dev_add_pack(&ip_packet_type);
}

//?net\core\dev.c
void?dev_add_pack(struct?packet_type?*pt)?{
????if?(pt->type?==?htons(ETH_P_ALL))?{
????????list_add_rcu(&pt->list,?&ptype_all);
????}?else?{
????????hash?=?ntohs(pt->type)?&?15;
????????list_add_rcu(&pt->list,?&ptype_base[hash]);
????}
}

module_init(inet_init);

static?struct?inet_protocol?tcp_protocol?=?{
????.handler?=??tcp_v4_rcv,
????.err_handler?=??tcp_v4_err,
????.no_policy?=????1,
};

static?struct?inet_protocol?udp_protocol?=?{
????.handler?=??udp_rcv,
????.err_handler?=??udp_err,
????.no_policy?=????1,
};

static?int?__init?inet_init(void)?{
????inet_add_protocol(&udp_protocol,?IPPROTO_UDP);
????inet_add_protocol(&tcp_protocol,?IPPROTO_TCP);
????ip_init();
????tcp_init();
}

//?net\ipv4\ip_input.c
int?ip_rcv(struct?sk_buff?*skb,?struct?net_device?*dev,?struct?packet_type?*pt)?{
????...
????return?NF_HOOK(PF_INET,?NF_IP_PRE_ROUTING,?skb,?dev,?NULL,
???????????????ip_rcv_finish);
}

static?inline?int?ip_rcv_finish(struct?sk_buff?*skb)?{
????...
????if?(skb->dst?==?NULL)?{
????????if?(ip_route_input(skb,?iph->daddr,?iph->saddr,?iph->tos,?dev))
????????????goto?drop;?
????}
????...
????return?dst_input(skb);
}

//?include\net\dst.h
//?rth->u.dst.input=?ip_local_deliver;
static?inline?int?dst_input(struct?sk_buff?*skb)?{
????...
????skb->dst->input(skb);
????...
}

//?net\ipv4\ip_input.c
int?ip_local_deliver(struct?sk_buff?*skb)?{
????...
????return?NF_HOOK(PF_INET,?NF_IP_LOCAL_IN,?skb,?skb->dev,?NULL,
???????????????ip_local_deliver_finish);
}

static?inline?int?ip_local_deliver_finish(struct?sk_buff?*skb)?{
????...
????ipprot?=?inet_protos[hash];
????ipprot->handler(skb);
????...
}

static?struct?inet_protocol?tcp_protocol?=?{
????.handler?=??tcp_v4_rcv,
????.err_handler?=??tcp_v4_err,
????.no_policy?=????1,
};

static?struct?inet_protocol?udp_protocol?=?{
????.handler?=??udp_rcv,
????.err_handler?=??udp_err,
????.no_policy?=????1,
};