madwifi驱动程序

//hardware:wireless chip ar9132

// software: "LSDK-WLAN-ap81fus-7.1.2.32.tgz" supported by atheros //20080303 init

一, 关键结构体变量

ath_ar_ops

net80211_ops

ar5416hal

(struct ath_softc_net80211)->sc_ops = ath_ar_ops (struct ath_ops) (struct ath_softc)->sc_ieee_ops = net80211_ops (struct

ieee80211_ops)

二, 关键的文件

if_ath_ahb.c

ath_linux.c

if_ath.c

ath_main.c

三, 关键函数：

1 init_ath_ahb (if_ath_ahb.c)

--1--> init_ahb (if_ath_ahb.c)

--1.1-->init_ath_wmac (if_ath_ahb.c,创建 net_device: dev)

--1.1.0--> dev->irq = get_wmac_irq (get the mac)

--1.1.1-->__ath_attach (ath_linux.c,创建scn,point,register the net_devivce)

--1.1.1.1-->ath_attach (if_ath.c, scn 填充）

--1.1.1.1.1-->ath_dev_attach (ath_main.c

scn->sc_ops=ath_ar_ops,sc->sc_ieee_ops=net80211_ops)

--1.1.1.1.2-->_ath_hal_attach

--1.1.1.1.3-->ieee80211_ifattach

--1.1.1.2--> scn->sc_ops->tx_init (ath_ar_ops->ath_rx_init)

--1.1.1.3--> scn->sc_ops->rx_init

--1.1.1.4--> request_irq (very important,irq function:ath_isr, request the irq,got in init_ath_wmac)

--1.1.1.5--> register_netdev (very important ,add the dev)

--1.1.1.6--> ath_iw_attach

--1.1.1.7--> register_simple_config_callback (for WPS)

extend functions:

2 ath_isr

--2.0-->scn->sc_ops->isr (ath_intr)

-- 2.1-->intr_tq( ath_tasklet)

--2.1.1-->scn->sc_ops->handle_intr (ath_handle_intr)

--2.1.1.1-->ath_handle_rx_intr

--2.1.1.2-->ath_handle_tx_intr

--2.1.1.2.1-->ath_tx_tasklet(ath_xmit.c)

//receive

3 ath_handle_intr

--3.1 --> ath_handle_rx_intr

--3.1.1--> ath_rx_tasklet

--3.1.1.1-->ath_rx_indicate (Pass frames up to the stack.)

--3.1.1.1.0-->sc->sc_ieee_ops->rx_indicate (ath_net80211_rx of struct net80211_ops)

--3.1.1.1.0.1->ath_net80211_input

--3.1.1.1.0.1.1-->ieee80211_input

--3.1.1.1.0.1.1.1--> ic->ic_recv_mgmt(ieee80211_recv_mgmt)

--3.1.1.1.0.1.1.2--> ieee80211_deliver_data

--3.1.1.1.0.1.1.1.1-->vlan_hwaccel_receive_skb or netif_rx

--3.1.1.1.1-->ath_rx_requeue

--3.1.1.1.1.1-->TAILQ_INSERT_TAIL (add to the tail of the buf list)

--netif_rx(skb)

//send

4 ath_netdev_hardstart (dev->hard_start_xmit,set in

__ath_attach,ath_linux.c)

--4.1-->ath_tx_send

--4.1.1-->scn->sc_ops->tx (ath_tx_start)

--4.1.1.1--> wbuf_map_sg

--4.1.1.1.1-->__wbuf_map_sg

--4.1.1.1.1.1-->wbuf_start_dma (ath_wbuf.c)

--4.1.1.1.1.1.1-->ath_tx_start_dma (here,josn added smart antenna)

5 ieee80211_ioctl_create_vap (iwconfig call ath0)

--5.1 get lan unit id

--5.2 ic->ic_vap_create (ath_vap_create)

--5.2.1-->scn->sc_ops->add_interface(ath_vap_attach)

--5.2.2-->ieee80211_vap_setup

--5.2.2.1--> ieee80211_crypto_vattach

--5.2.2.2--> ieee80211_proto_vattach

--5.2.2.3.1--> vap->iv_newstate = ieee80211_newstate

--5.2.2.3--> ieee80211_ioctl_vattach

6

ieee80211_proto_attach

--5.2.2.2.1--> ic->ic_recv_mgmt = ieee80211_recv_mgmt

ieee80211_input-->ic->ic_recv_mgmt(ieee80211_recv_mgmt)-->ieee80211_a uth_open

-->ieee80211_new_state-->vap->iv_newstate(vap, nstate, arg);

四, 发送包时函数调用过程

ath_netdev_hardstart -> ath_tx_send -> ath_tx_start ->

ath_tx_start_dma

五, 结构体

(struct net_device)->priv = struct ath_softc_net80211 变量名简称scn

(struct ath_softc_net80211)->sc_dev = struct ath_softc 变量名简称sc

(struct ath_node_net80211)->an_sta = struct ath_node 变量名简称an (struct ath_node_net80211)->an_node = struct ieee80211_node 变量名简称ni

发送包时函数调用过程应该比前面的复杂。

应该是驱动先注册hard_start_xmit(分别在vap和wifi）,然后在系统需要发送数据时，先调用vap的hard_start_xmit，直到发送出去为止。

1 ath_vap_create(register in ath_attach) -->

ieee80211_vap_setup--> dev->hard_start_xmit =

ieee80211_hardstart(REGISTER vap's hard_start_xmit)

2 __ath_attach -->dev->hard_start_xmit =

ath_netdev_hardstart(REGISTER wifi's hard_start_xmit)

3 dev_queue_xmit(such as called by prism2_sta_send_mgmt in hostap) -->dev->hard_start_xmit(ieee80211_hardstart)-->skb->dev = parent,

dev_queue_xmit-->dev->hard_start_xmit(ath_netdev_hardstart)-->

ath_tx_send --> ath_tx_start --> ath_tx_start_dma

评论人：jinhaijun评论日期：2008-3-12 11:13

//20080312

//关于 crypt

//wep for example

ath_netdev_hardstart (dev->hard_start_xmit,set in __ath_attach,ath_linux.c)

1.1-->ath_tx_send

1.1.1-->ath_tx_prepare

1.1.1.1-->ieee80211_crypto_encap

1.1.1.1.1-->cip->ic_encap (wep_encap,registered in linux/net80211/ieee80211_crypto_wep.c)

1.1.1.1.1.1-->wep_encrypt