skb里的数据

接收

#include<stdio.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/in.h>#include<unistd.h>#include<errno.h>#include<string.h>#include<stdlib.h>#include <sys/stat.h>    #include <sys/ioctl.h>    #include <fcntl.h>    #include <linux/fs.h>      #define DEBUG    #ifdef DEBUG      #define DBG(...) fprintf(stderr, " DBG(%s, %s(), %d): ", __FILE__, __FUNCTION__, __LINE__); fprintf(stderr, __VA_ARGS__)      #else      #define DBG(...)      #endif   #define SERV_PORT   3333int main(int argc,char* argv[]){int sock_fd;   //套接子描述符号if(argc==1){  int recv_num;  int send_num;  int client_len;  char recv_buf[1];  struct sockaddr_in  addr_serv;  struct sockaddr_in  addr_client;//服务器和客户端地址  sock_fd = socket(AF_INET,SOCK_DGRAM,0);  if(sock_fd < 0){          DBG("socket");          exit(1);  } else{            DBG("sock sucessful\n");  }  //初始化服务器断地址  memset(&addr_serv,0,sizeof(struct sockaddr_in));  addr_serv.sin_family = AF_INET;//协议族  addr_serv.sin_port = htons(SERV_PORT);  addr_serv.sin_addr.s_addr = htonl(INADDR_ANY);    client_len = sizeof(struct sockaddr_in);  /*绑定套接子*/  if(bind(sock_fd,(struct sockaddr *)&addr_serv,sizeof(struct sockaddr_in))<0 ){          DBG("bind");          exit(1);  } else{            DBG("bind sucess\n");  }  while(1){  recv_num = recvfrom(sock_fd,recv_buf,sizeof(recv_buf),0,(struct sockaddr *)&addr_client,&client_len);  if(recv_num <  0){          DBG("bad\n");          DBG("again recvfrom");          exit(1);  } else{          DBG("recv sucess:%x\n",recv_buf[0]);  }  }   }  close(sock_fd);  return 0;}

发送

//send #include<stdio.h>#include<string.h>#include<errno.h>#include<stdlib.h>#include<unistd.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/in.h>#define DEBUG    #ifdef DEBUG      #define DBG(...) fprintf(stderr, " DBG(%s, %s(), %d): ", __FILE__, __FUNCTION__, __LINE__); fprintf(stderr, __VA_ARGS__)      #else      #define DBG(...)      #endif   #define DEST_PORT 3333#include <termios.h>static struct termios stored_settings;void set_keypress(void){    struct termios new_settings;    tcgetattr(0,&stored_settings);    new_settings = stored_settings;    /* Disable canonical mode, and set buffer size to 1 byte */    new_settings.c_lflag &= (~ICANON);    new_settings.c_cc[VTIME] = 0;    new_settings.c_cc[VMIN] = 1;    tcsetattr(0,TCSANOW,&new_settings);    return;}void reset_keypress(void){    tcsetattr(0,TCSANOW,&stored_settings);    return;}int main(int argc,char* argv[]){if(argc!=2) {printf("param error\n");return;}int sock_fd;/*套接字文件描述符*/int send_num;int recv_num;int dest_len;char send_buf[1];struct sockaddr_in addr_serv;/*服务端地址，客户端地址*/set_keypress();sock_fd = socket(AF_INET,SOCK_DGRAM,0);//创建套接子//初始化服务器端地址memset(&addr_serv,0,sizeof(addr_serv));addr_serv.sin_family = AF_INET;addr_serv.sin_addr.s_addr = inet_addr(argv[1]);addr_serv.sin_port = htons(DEST_PORT);dest_len = sizeof(struct sockaddr_in);//response for keychar ch;while(1)//may use ctrl+c to kill{ch=getchar();DBG("ch=%x\n",ch);send_num = sendto(sock_fd,&ch,sizeof(ch),0,(struct sockaddr *)&addr_serv,dest_len);if(send_num < 0){ DBG("sendto"); exit(1);} else{  DBG("send sucessful\n");}}close(sock_fd);reset_keypress();return 0;}

驱动

/* *      Davicom DM9000 Fast Ethernet driver for Linux. * Copyright (C) 1997  Sten Wang * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * (C) Copyright 1997-1998 DAVICOM Semiconductor,Inc. All Rights Reserved. * * Additional updates, Copyright: *Ben Dooks <[e-mail]> *Sascha Hauer <[e-mail]> */#include <linux/module.h>#include <linux/ioport.h>#include <linux/netdevice.h>#include <linux/etherdevice.h>#include <linux/init.h>#include <linux/skbuff.h>#include <linux/spinlock.h>#include <linux/crc32.h>#include <linux/mii.h>#include <linux/ethtool.h>#include <linux/dm9000.h>#include <linux/delay.h>#include <linux/platform_device.h>#include <linux/irq.h>#include <linux/slab.h>#include <asm/delay.h>#include <asm/irq.h>#include <asm/io.h>#include "dm9000.h"/* Board/System/Debug information/definition ---------------- */#define DM9000_PHY0x40/* PHY address 0x01 */#define CARDNAME"dm9000"#define DRV_VERSION"1.31"#define DEBUG  #ifdef DEBUG    #define DBG(...) printk(" DBG(%s, %s(), %d): ", __FILE__, __FUNCTION__, __LINE__); printk(__VA_ARGS__)    #else    #define DBG(...)    #endif    /* * Transmit timeout, default 5 seconds. */static int watchdog = 5000;module_param(watchdog, int, 0400);MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");/* DM9000 register address locking. * * The DM9000 uses an address register to control where data written * to the data register goes. This means that the address register * must be preserved over interrupts or similar calls. * * During interrupt and other critical calls, a spinlock is used to * protect the system, but the calls themselves save the address * in the address register in case they are interrupting another * access to the device. * * For general accesses a lock is provided so that calls which are * allowed to sleep are serialised so that the address register does * not need to be saved. This lock also serves to serialise access * to the EEPROM and PHY access registers which are shared between * these two devices. *//* The driver supports the original DM9000E, and now the two newer * devices, DM9000A and DM9000B. */enum dm9000_type {TYPE_DM9000E,/* original DM9000 */TYPE_DM9000A,TYPE_DM9000B};/* Structure/enum declaration ------------------------------- */typedef struct board_info {void __iomem*io_addr;/* Register I/O base address */void __iomem*io_data;/* Data I/O address */u16 irq;/* IRQ */u16tx_pkt_cnt;u16queue_pkt_len;u16queue_start_addr;u16queue_ip_summed;u16dbug_cnt;u8io_mode;/* 0:word, 2:byte */u8phy_addr;u8imr_all;unsigned intflags;unsigned intin_suspend :1;unsigned intwake_supported :1;intdebug_level;enum dm9000_type type;void (*inblk)(void __iomem *port, void *data, int length);void (*outblk)(void __iomem *port, void *data, int length);void (*dumpblk)(void __iomem *port, int length);struct device*dev;     /* parent device */struct resource*addr_res;   /* resources found */struct resource *data_res;struct resource*addr_req;   /* resources requested */struct resource *data_req;struct resource *irq_res;int irq_wake;struct mutex addr_lock;/* phy and eeprom access lock */struct delayed_work phy_poll;struct net_device  *ndev;spinlock_tlock;struct mii_if_info mii;u32msg_enable;u32wake_state;intrx_csum;intcan_csum;intip_summed;} board_info_t;/* debug code */#define dm9000_dbg(db, lev, msg...) do {\if ((lev) < CONFIG_DM9000_DEBUGLEVEL &&\    (lev) < db->debug_level) {\dev_dbg(db->dev, msg);\}\} while (0)static inline board_info_t *to_dm9000_board(struct net_device *dev){return netdev_priv(dev);}/* DM9000 network board routine ---------------------------- */static voiddm9000_reset(board_info_t * db){dev_dbg(db->dev, "resetting device\n");/* RESET device */writeb(DM9000_NCR, db->io_addr);udelay(200);writeb(NCR_RST, db->io_data);udelay(200);}/* *   Read a byte from I/O port */static u8ior(board_info_t * db, int reg){writeb(reg, db->io_addr);return readb(db->io_data);}/* *   Write a byte to I/O port */static voidiow(board_info_t * db, int reg, int value){writeb(reg, db->io_addr);writeb(value, db->io_data);}/* routines for sending block to chip */static void dm9000_outblk_8bit(void __iomem *reg, void *data, int count){writesb(reg, data, count);}static void dm9000_outblk_16bit(void __iomem *reg, void *data, int count){writesw(reg, data, (count+1) >> 1);}static void dm9000_outblk_32bit(void __iomem *reg, void *data, int count){writesl(reg, data, (count+3) >> 2);}/* input block from chip to memory */static void dm9000_inblk_8bit(void __iomem *reg, void *data, int count){readsb(reg, data, count);}static void dm9000_inblk_16bit(void __iomem *reg, void *data, int count){readsw(reg, data, (count+1) >> 1);}static void dm9000_inblk_32bit(void __iomem *reg, void *data, int count){readsl(reg, data, (count+3) >> 2);}/* dump block from chip to null */static void dm9000_dumpblk_8bit(void __iomem *reg, int count){int i;int tmp;for (i = 0; i < count; i++)tmp = readb(reg);}static void dm9000_dumpblk_16bit(void __iomem *reg, int count){int i;int tmp;count = (count + 1) >> 1;for (i = 0; i < count; i++)tmp = readw(reg);}static void dm9000_dumpblk_32bit(void __iomem *reg, int count){int i;int tmp;count = (count + 3) >> 2;for (i = 0; i < count; i++)tmp = readl(reg);}/* dm9000_set_io * * select the specified set of io routines to use with the * device */static void dm9000_set_io(struct board_info *db, int byte_width){/* use the size of the data resource to work out what IO * routines we want to use */switch (byte_width) {case 1:db->dumpblk = dm9000_dumpblk_8bit;db->outblk  = dm9000_outblk_8bit;db->inblk   = dm9000_inblk_8bit;break;case 3:dev_dbg(db->dev, ": 3 byte IO, falling back to 16bit\n");case 2:db->dumpblk = dm9000_dumpblk_16bit;db->outblk  = dm9000_outblk_16bit;db->inblk   = dm9000_inblk_16bit;break;case 4:default:db->dumpblk = dm9000_dumpblk_32bit;db->outblk  = dm9000_outblk_32bit;db->inblk   = dm9000_inblk_32bit;break;}}static void dm9000_schedule_poll(board_info_t *db){if (db->type == TYPE_DM9000E)schedule_delayed_work(&db->phy_poll, HZ * 2);}static int dm9000_ioctl(struct net_device *dev, struct ifreq *req, int cmd){board_info_t *dm = to_dm9000_board(dev);if (!netif_running(dev))return -EINVAL;return generic_mii_ioctl(&dm->mii, if_mii(req), cmd, NULL);}static unsigned intdm9000_read_locked(board_info_t *db, int reg){unsigned long flags;unsigned int ret;spin_lock_irqsave(&db->lock, flags);ret = ior(db, reg);spin_unlock_irqrestore(&db->lock, flags);return ret;}static int dm9000_wait_eeprom(board_info_t *db){unsigned int status;int timeout = 8;/* wait max 8msec *//* The DM9000 data sheets say we should be able to * poll the ERRE bit in EPCR to wait for the EEPROM * operation. From testing several chips, this bit * does not seem to work. * * We attempt to use the bit, but fall back to the * timeout (which is why we do not return an error * on expiry) to say that the EEPROM operation has * completed. */while (1) {status = dm9000_read_locked(db, DM9000_EPCR);if ((status & EPCR_ERRE) == 0)break;msleep(1);if (timeout-- < 0) {dev_dbg(db->dev, "timeout waiting EEPROM\n");break;}}return 0;}/* *  Read a word data from EEPROM */static voiddm9000_read_eeprom(board_info_t *db, int offset, u8 *to){unsigned long flags;if (db->flags & DM9000_PLATF_NO_EEPROM) {to[0] = 0xff;to[1] = 0xff;return;}mutex_lock(&db->addr_lock);spin_lock_irqsave(&db->lock, flags);iow(db, DM9000_EPAR, offset);iow(db, DM9000_EPCR, EPCR_ERPRR);spin_unlock_irqrestore(&db->lock, flags);dm9000_wait_eeprom(db);/* delay for at-least 150uS */msleep(1);spin_lock_irqsave(&db->lock, flags);iow(db, DM9000_EPCR, 0x0);to[0] = ior(db, DM9000_EPDRL);to[1] = ior(db, DM9000_EPDRH);spin_unlock_irqrestore(&db->lock, flags);mutex_unlock(&db->addr_lock);}/* * Write a word data to SROM */static voiddm9000_write_eeprom(board_info_t *db, int offset, u8 *data){unsigned long flags;if (db->flags & DM9000_PLATF_NO_EEPROM)return;mutex_lock(&db->addr_lock);spin_lock_irqsave(&db->lock, flags);iow(db, DM9000_EPAR, offset);iow(db, DM9000_EPDRH, data[1]);iow(db, DM9000_EPDRL, data[0]);iow(db, DM9000_EPCR, EPCR_WEP | EPCR_ERPRW);spin_unlock_irqrestore(&db->lock, flags);dm9000_wait_eeprom(db);mdelay(1);/* wait at least 150uS to clear */spin_lock_irqsave(&db->lock, flags);iow(db, DM9000_EPCR, 0);spin_unlock_irqrestore(&db->lock, flags);mutex_unlock(&db->addr_lock);}/* ethtool ops */static void dm9000_get_drvinfo(struct net_device *dev,       struct ethtool_drvinfo *info){board_info_t *dm = to_dm9000_board(dev);strcpy(info->driver, CARDNAME);strcpy(info->version, DRV_VERSION);strcpy(info->bus_info, to_platform_device(dm->dev)->name);}static u32 dm9000_get_msglevel(struct net_device *dev){board_info_t *dm = to_dm9000_board(dev);return dm->msg_enable;}static void dm9000_set_msglevel(struct net_device *dev, u32 value){board_info_t *dm = to_dm9000_board(dev);dm->msg_enable = value;}static int dm9000_get_settings(struct net_device *dev, struct ethtool_cmd *cmd){board_info_t *dm = to_dm9000_board(dev);mii_ethtool_gset(&dm->mii, cmd);return 0;}static int dm9000_set_settings(struct net_device *dev, struct ethtool_cmd *cmd){board_info_t *dm = to_dm9000_board(dev);return mii_ethtool_sset(&dm->mii, cmd);}static int dm9000_nway_reset(struct net_device *dev){board_info_t *dm = to_dm9000_board(dev);return mii_nway_restart(&dm->mii);}static uint32_t dm9000_get_rx_csum(struct net_device *dev){board_info_t *dm = to_dm9000_board(dev);return dm->rx_csum;}static int dm9000_set_rx_csum_unlocked(struct net_device *dev, uint32_t data){board_info_t *dm = to_dm9000_board(dev);if (dm->can_csum) {dm->rx_csum = data;iow(dm, DM9000_RCSR, dm->rx_csum ? RCSR_CSUM : 0);return 0;}return -EOPNOTSUPP;}static int dm9000_set_rx_csum(struct net_device *dev, uint32_t data){board_info_t *dm = to_dm9000_board(dev);unsigned long flags;int ret;spin_lock_irqsave(&dm->lock, flags);ret = dm9000_set_rx_csum_unlocked(dev, data);spin_unlock_irqrestore(&dm->lock, flags);return ret;}static int dm9000_set_tx_csum(struct net_device *dev, uint32_t data){board_info_t *dm = to_dm9000_board(dev);int ret = -EOPNOTSUPP;if (dm->can_csum)ret = ethtool_op_set_tx_csum(dev, data);return ret;}static u32 dm9000_get_link(struct net_device *dev){board_info_t *dm = to_dm9000_board(dev);u32 ret;if (dm->flags & DM9000_PLATF_EXT_PHY)ret = mii_link_ok(&dm->mii);elseret = dm9000_read_locked(dm, DM9000_NSR) & NSR_LINKST ? 1 : 0;return ret;}#define DM_EEPROM_MAGIC(0x444D394B)static int dm9000_get_eeprom_len(struct net_device *dev){return 128;}static int dm9000_get_eeprom(struct net_device *dev,     struct ethtool_eeprom *ee, u8 *data){board_info_t *dm = to_dm9000_board(dev);int offset = ee->offset;int len = ee->len;int i;/* EEPROM access is aligned to two bytes */if ((len & 1) != 0 || (offset & 1) != 0)return -EINVAL;if (dm->flags & DM9000_PLATF_NO_EEPROM)return -ENOENT;ee->magic = DM_EEPROM_MAGIC;for (i = 0; i < len; i += 2)dm9000_read_eeprom(dm, (offset + i) / 2, data + i);return 0;}static int dm9000_set_eeprom(struct net_device *dev,     struct ethtool_eeprom *ee, u8 *data){board_info_t *dm = to_dm9000_board(dev);int offset = ee->offset;int len = ee->len;int i;/* EEPROM access is aligned to two bytes */if ((len & 1) != 0 || (offset & 1) != 0)return -EINVAL;if (dm->flags & DM9000_PLATF_NO_EEPROM)return -ENOENT;if (ee->magic != DM_EEPROM_MAGIC)return -EINVAL;for (i = 0; i < len; i += 2)dm9000_write_eeprom(dm, (offset + i) / 2, data + i);return 0;}static void dm9000_get_wol(struct net_device *dev, struct ethtool_wolinfo *w){board_info_t *dm = to_dm9000_board(dev);memset(w, 0, sizeof(struct ethtool_wolinfo));/* note, we could probably support wake-phy too */w->supported = dm->wake_supported ? WAKE_MAGIC : 0;w->wolopts = dm->wake_state;}static int dm9000_set_wol(struct net_device *dev, struct ethtool_wolinfo *w){board_info_t *dm = to_dm9000_board(dev);unsigned long flags;u32 opts = w->wolopts;u32 wcr = 0;if (!dm->wake_supported)return -EOPNOTSUPP;if (opts & ~WAKE_MAGIC)return -EINVAL;if (opts & WAKE_MAGIC)wcr |= WCR_MAGICEN;mutex_lock(&dm->addr_lock);spin_lock_irqsave(&dm->lock, flags);iow(dm, DM9000_WCR, wcr);spin_unlock_irqrestore(&dm->lock, flags);mutex_unlock(&dm->addr_lock);if (dm->wake_state != opts) {/* change in wol state, update IRQ state */if (!dm->wake_state)set_irq_wake(dm->irq_wake, 1);else if (dm->wake_state & !opts)set_irq_wake(dm->irq_wake, 0);}dm->wake_state = opts;return 0;}static const struct ethtool_ops dm9000_ethtool_ops = {.get_drvinfo= dm9000_get_drvinfo,.get_settings= dm9000_get_settings,.set_settings= dm9000_set_settings,.get_msglevel= dm9000_get_msglevel,.set_msglevel= dm9000_set_msglevel,.nway_reset= dm9000_nway_reset,.get_link= dm9000_get_link,.get_wol= dm9000_get_wol,.set_wol= dm9000_set_wol, .get_eeprom_len= dm9000_get_eeprom_len, .get_eeprom= dm9000_get_eeprom, .set_eeprom= dm9000_set_eeprom,.get_rx_csum= dm9000_get_rx_csum,.set_rx_csum= dm9000_set_rx_csum,.get_tx_csum= ethtool_op_get_tx_csum,.set_tx_csum= dm9000_set_tx_csum,};static void dm9000_show_carrier(board_info_t *db,unsigned carrier, unsigned nsr){struct net_device *ndev = db->ndev;unsigned ncr = dm9000_read_locked(db, DM9000_NCR);if (carrier)dev_info(db->dev, "%s: link up, %dMbps, %s-duplex, no LPA\n", ndev->name, (nsr & NSR_SPEED) ? 10 : 100, (ncr & NCR_FDX) ? "full" : "half");elsedev_info(db->dev, "%s: link down\n", ndev->name);}static voiddm9000_poll_work(struct work_struct *w){struct delayed_work *dw = to_delayed_work(w);board_info_t *db = container_of(dw, board_info_t, phy_poll);struct net_device *ndev = db->ndev;if (db->flags & DM9000_PLATF_SIMPLE_PHY &&    !(db->flags & DM9000_PLATF_EXT_PHY)) {unsigned nsr = dm9000_read_locked(db, DM9000_NSR);unsigned old_carrier = netif_carrier_ok(ndev) ? 1 : 0;unsigned new_carrier;new_carrier = (nsr & NSR_LINKST) ? 1 : 0;if (old_carrier != new_carrier) {if (netif_msg_link(db))dm9000_show_carrier(db, new_carrier, nsr);if (!new_carrier)netif_carrier_off(ndev);elsenetif_carrier_on(ndev);}} elsemii_check_media(&db->mii, netif_msg_link(db), 0);if (netif_running(ndev))dm9000_schedule_poll(db);}/* dm9000_release_board * * release a board, and any mapped resources */static voiddm9000_release_board(struct platform_device *pdev, struct board_info *db){/* unmap our resources */iounmap(db->io_addr);iounmap(db->io_data);/* release the resources */release_resource(db->data_req);kfree(db->data_req);release_resource(db->addr_req);kfree(db->addr_req);}static unsigned char dm9000_type_to_char(enum dm9000_type type){switch (type) {case TYPE_DM9000E: return 'e';case TYPE_DM9000A: return 'a';case TYPE_DM9000B: return 'b';}return '?';}/* *  Set DM9000 multicast address */static voiddm9000_hash_table_unlocked(struct net_device *dev){board_info_t *db = netdev_priv(dev);struct netdev_hw_addr *ha;int i, oft;u32 hash_val;u16 hash_table[4];u8 rcr = RCR_DIS_LONG | RCR_DIS_CRC | RCR_RXEN;dm9000_dbg(db, 1, "entering %s\n", __func__);for (i = 0, oft = DM9000_PAR; i < 6; i++, oft++)iow(db, oft, dev->dev_addr[i]);/* Clear Hash Table */for (i = 0; i < 4; i++)hash_table[i] = 0x0;/* broadcast address */hash_table[3] = 0x8000;if (dev->flags & IFF_PROMISC)rcr |= RCR_PRMSC;if (dev->flags & IFF_ALLMULTI)rcr |= RCR_ALL;/* the multicast address in Hash Table : 64 bits */netdev_for_each_mc_addr(ha, dev) {hash_val = ether_crc_le(6, ha->addr) & 0x3f;hash_table[hash_val / 16] |= (u16) 1 << (hash_val % 16);}/* Write the hash table to MAC MD table */for (i = 0, oft = DM9000_MAR; i < 4; i++) {iow(db, oft++, hash_table[i]);iow(db, oft++, hash_table[i] >> 8);}iow(db, DM9000_RCR, rcr);}static voiddm9000_hash_table(struct net_device *dev){board_info_t *db = netdev_priv(dev);unsigned long flags;spin_lock_irqsave(&db->lock, flags);dm9000_hash_table_unlocked(dev);spin_unlock_irqrestore(&db->lock, flags);}/* * Initialize dm9000 board */static voiddm9000_init_dm9000(struct net_device *dev){board_info_t *db = netdev_priv(dev);unsigned int imr;unsigned int ncr;dm9000_dbg(db, 1, "entering %s\n", __func__);/* I/O mode */db->io_mode = ior(db, DM9000_ISR) >> 6;/* ISR bit7:6 keeps I/O mode *//* Checksum mode */dm9000_set_rx_csum_unlocked(dev, db->rx_csum);iow(db, DM9000_GPCR, GPCR_GEP_CNTL);/* Let GPIO0 output */ncr = (db->flags & DM9000_PLATF_EXT_PHY) ? NCR_EXT_PHY : 0;/* if wol is needed, then always set NCR_WAKEEN otherwise we end * up dumping the wake events if we disable this. There is already * a wake-mask in DM9000_WCR */if (db->wake_supported)ncr |= NCR_WAKEEN;iow(db, DM9000_NCR, ncr);/* Program operating register */iow(db, DM9000_TCR, 0);        /* TX Polling clear */iow(db, DM9000_BPTR, 0x3f);/* Less 3Kb, 200us */iow(db, DM9000_FCR, 0xff);/* Flow Control */iow(db, DM9000_SMCR, 0);        /* Special Mode *//* clear TX status */iow(db, DM9000_NSR, NSR_WAKEST | NSR_TX2END | NSR_TX1END);iow(db, DM9000_ISR, ISR_CLR_STATUS); /* Clear interrupt status *//* Set address filter table */dm9000_hash_table_unlocked(dev);imr = IMR_PAR | IMR_PTM | IMR_PRM;if (db->type != TYPE_DM9000E)imr |= IMR_LNKCHNG;db->imr_all = imr;/* Enable TX/RX interrupt mask */iow(db, DM9000_IMR, imr);/* Init Driver variable */db->tx_pkt_cnt = 0;db->queue_pkt_len = 0;dev->trans_start = jiffies;}/* Our watchdog timed out. Called by the networking layer */static void dm9000_timeout(struct net_device *dev){board_info_t *db = netdev_priv(dev);u8 reg_save;unsigned long flags;/* Save previous register address */spin_lock_irqsave(&db->lock, flags);reg_save = readb(db->io_addr);netif_stop_queue(dev);dm9000_reset(db);dm9000_init_dm9000(dev);/* We can accept TX packets again */dev->trans_start = jiffies; /* prevent tx timeout */netif_wake_queue(dev);/* Restore previous register address */writeb(reg_save, db->io_addr);spin_unlock_irqrestore(&db->lock, flags);}static void dm9000_send_packet(struct net_device *dev,       int ip_summed,       u16 pkt_len){board_info_t *dm = to_dm9000_board(dev);/* The DM9000 is not smart enough to leave fragmented packets alone. */if (dm->ip_summed != ip_summed) {if (ip_summed == CHECKSUM_NONE)iow(dm, DM9000_TCCR, 0);elseiow(dm, DM9000_TCCR, TCCR_IP | TCCR_UDP | TCCR_TCP);dm->ip_summed = ip_summed;}/* Set TX length to DM9000 */iow(dm, DM9000_TXPLL, pkt_len);iow(dm, DM9000_TXPLH, pkt_len >> 8);/* Issue TX polling command */iow(dm, DM9000_TCR, TCR_TXREQ);/* Cleared after TX complete */}/* *  Hardware start transmission. *  Send a packet to media from the upper layer. */static intdm9000_start_xmit(struct sk_buff *skb, struct net_device *dev){unsigned long flags;board_info_t *db = netdev_priv(dev);dm9000_dbg(db, 3, "%s:\n", __func__);if (db->tx_pkt_cnt > 1)return NETDEV_TX_BUSY;spin_lock_irqsave(&db->lock, flags);/* Move data to DM9000 TX RAM */writeb(DM9000_MWCMD, db->io_addr);(db->outblk)(db->io_data, skb->data, skb->len);dev->stats.tx_bytes += skb->len;db->tx_pkt_cnt++;DBG("打印skb里的数据\n");  int i;for(i=0;i<skb->len;i++)  {  DBG("skb->data[%d]=%x\n",i,skb->data[i]);  }  /* TX control: First packet immediately send, second packet queue */if (db->tx_pkt_cnt == 1) {dm9000_send_packet(dev, skb->ip_summed, skb->len);} else {/* Second packet */db->queue_pkt_len = skb->len;db->queue_ip_summed = skb->ip_summed;netif_stop_queue(dev);}spin_unlock_irqrestore(&db->lock, flags);/* free this SKB */dev_kfree_skb(skb);return NETDEV_TX_OK;}/* * DM9000 interrupt handler * receive the packet to upper layer, free the transmitted packet */static void dm9000_tx_done(struct net_device *dev, board_info_t *db){int tx_status = ior(db, DM9000_NSR);/* Got TX status */if (tx_status & (NSR_TX2END | NSR_TX1END)) {/* One packet sent complete */db->tx_pkt_cnt--;dev->stats.tx_packets++;if (netif_msg_tx_done(db))dev_dbg(db->dev, "tx done, NSR %02x\n", tx_status);/* Queue packet check & send */if (db->tx_pkt_cnt > 0)dm9000_send_packet(dev, db->queue_ip_summed,   db->queue_pkt_len);netif_wake_queue(dev);}}struct dm9000_rxhdr {u8RxPktReady;u8RxStatus;__le16RxLen;} __packed;/* *  Received a packet and pass to upper layer */static voiddm9000_rx(struct net_device *dev){board_info_t *db = netdev_priv(dev);struct dm9000_rxhdr rxhdr;struct sk_buff *skb;u8 rxbyte, *rdptr;bool GoodPacket;int RxLen;/* Check packet ready or not */do {ior(db, DM9000_MRCMDX);/* Dummy read *//* Get most updated data */rxbyte = readb(db->io_data);/* Status check: this byte must be 0 or 1 */if (rxbyte & DM9000_PKT_ERR) {dev_warn(db->dev, "status check fail: %d\n", rxbyte);iow(db, DM9000_RCR, 0x00);/* Stop Device */iow(db, DM9000_ISR, IMR_PAR);/* Stop INT request */return;}if (!(rxbyte & DM9000_PKT_RDY))return;/* A packet ready now  & Get status/length */GoodPacket = true;writeb(DM9000_MRCMD, db->io_addr);(db->inblk)(db->io_data, &rxhdr, sizeof(rxhdr));RxLen = le16_to_cpu(rxhdr.RxLen);if (netif_msg_rx_status(db))dev_dbg(db->dev, "RX: status %02x, length %04x\n",rxhdr.RxStatus, RxLen);/* Packet Status check */if (RxLen < 0x40) {GoodPacket = false;if (netif_msg_rx_err(db))dev_dbg(db->dev, "RX: Bad Packet (runt)\n");}if (RxLen > DM9000_PKT_MAX) {dev_dbg(db->dev, "RST: RX Len:%x\n", RxLen);}/* rxhdr.RxStatus is identical to RSR register. */if (rxhdr.RxStatus & (RSR_FOE | RSR_CE | RSR_AE |      RSR_PLE | RSR_RWTO |      RSR_LCS | RSR_RF)) {GoodPacket = false;if (rxhdr.RxStatus & RSR_FOE) {if (netif_msg_rx_err(db))dev_dbg(db->dev, "fifo error\n");dev->stats.rx_fifo_errors++;}if (rxhdr.RxStatus & RSR_CE) {if (netif_msg_rx_err(db))dev_dbg(db->dev, "crc error\n");dev->stats.rx_crc_errors++;}if (rxhdr.RxStatus & RSR_RF) {if (netif_msg_rx_err(db))dev_dbg(db->dev, "length error\n");dev->stats.rx_length_errors++;}}/* Move data from DM9000 */if (GoodPacket &&    ((skb = dev_alloc_skb(RxLen + 4)) != NULL)) {skb_reserve(skb, 2);rdptr = (u8 *) skb_put(skb, RxLen - 4);/* Read received packet from RX SRAM */(db->inblk)(db->io_data, rdptr, RxLen);dev->stats.rx_bytes += RxLen;/* Pass to upper layer */skb->protocol = eth_type_trans(skb, dev);if (db->rx_csum) {if ((((rxbyte & 0x1c) << 3) & rxbyte) == 0)skb->ip_summed = CHECKSUM_UNNECESSARY;elseskb_checksum_none_assert(skb);}netif_rx(skb);dev->stats.rx_packets++;DBG("打印skb里的数据\n");  int i;for(i=0;i<skb->len;i++)  {  DBG("skb->data[%d]=%x\n",i,skb->data[i]);  }  } else {/* need to dump the packet's data */(db->dumpblk)(db->io_data, RxLen);}} while (rxbyte & DM9000_PKT_RDY);}static irqreturn_t dm9000_interrupt(int irq, void *dev_id){struct net_device *dev = dev_id;board_info_t *db = netdev_priv(dev);int int_status;unsigned long flags;u8 reg_save;dm9000_dbg(db, 3, "entering %s\n", __func__);/* A real interrupt coming *//* holders of db->lock must always block IRQs */spin_lock_irqsave(&db->lock, flags);/* Save previous register address */reg_save = readb(db->io_addr);/* Disable all interrupts */iow(db, DM9000_IMR, IMR_PAR);/* Got DM9000 interrupt status */int_status = ior(db, DM9000_ISR);/* Got ISR */iow(db, DM9000_ISR, int_status);/* Clear ISR status */if (netif_msg_intr(db))dev_dbg(db->dev, "interrupt status %02x\n", int_status);/* Received the coming packet */if (int_status & ISR_PRS)dm9000_rx(dev);/* Trnasmit Interrupt check */if (int_status & ISR_PTS)dm9000_tx_done(dev, db);if (db->type != TYPE_DM9000E) {if (int_status & ISR_LNKCHNG) {/* fire a link-change request */schedule_delayed_work(&db->phy_poll, 1);}}/* Re-enable interrupt mask */iow(db, DM9000_IMR, db->imr_all);/* Restore previous register address */writeb(reg_save, db->io_addr);spin_unlock_irqrestore(&db->lock, flags);return IRQ_HANDLED;}static irqreturn_t dm9000_wol_interrupt(int irq, void *dev_id){struct net_device *dev = dev_id;board_info_t *db = netdev_priv(dev);unsigned long flags;unsigned nsr, wcr;spin_lock_irqsave(&db->lock, flags);nsr = ior(db, DM9000_NSR);wcr = ior(db, DM9000_WCR);dev_dbg(db->dev, "%s: NSR=0x%02x, WCR=0x%02x\n", __func__, nsr, wcr);if (nsr & NSR_WAKEST) {/* clear, so we can avoid */iow(db, DM9000_NSR, NSR_WAKEST);if (wcr & WCR_LINKST)dev_info(db->dev, "wake by link status change\n");if (wcr & WCR_SAMPLEST)dev_info(db->dev, "wake by sample packet\n");if (wcr & WCR_MAGICST )dev_info(db->dev, "wake by magic packet\n");if (!(wcr & (WCR_LINKST | WCR_SAMPLEST | WCR_MAGICST)))dev_err(db->dev, "wake signalled with no reason? ""NSR=0x%02x, WSR=0x%02x\n", nsr, wcr);}spin_unlock_irqrestore(&db->lock, flags);return (nsr & NSR_WAKEST) ? IRQ_HANDLED : IRQ_NONE;}#ifdef CONFIG_NET_POLL_CONTROLLER/* *Used by netconsole */static void dm9000_poll_controller(struct net_device *dev){disable_irq(dev->irq);dm9000_interrupt(dev->irq, dev);enable_irq(dev->irq);}#endif/* *  Open the interface. *  The interface is opened whenever "ifconfig" actives it. */static intdm9000_open(struct net_device *dev){board_info_t *db = netdev_priv(dev);unsigned long irqflags = db->irq_res->flags & IRQF_TRIGGER_MASK;if (netif_msg_ifup(db))dev_dbg(db->dev, "enabling %s\n", dev->name);/* If there is no IRQ type specified, default to something that * may work, and tell the user that this is a problem */if (irqflags == IRQF_TRIGGER_NONE)dev_warn(db->dev, "WARNING: no IRQ resource flags set.\n");irqflags |= IRQF_SHARED;if (request_irq(dev->irq, dm9000_interrupt, irqflags, dev->name, dev))return -EAGAIN;/* GPIO0 on pre-activate PHY, Reg 1F is not set by reset */iow(db, DM9000_GPR, 0);/* REG_1F bit0 activate phyxcer */mdelay(1); /* delay needs by DM9000B *//* Initialize DM9000 board */dm9000_reset(db);dm9000_init_dm9000(dev);/* Init driver variable */db->dbug_cnt = 0;mii_check_media(&db->mii, netif_msg_link(db), 1);netif_start_queue(dev);dm9000_schedule_poll(db);return 0;}/* * Sleep, either by using msleep() or if we are suspending, then * use mdelay() to sleep. */static void dm9000_msleep(board_info_t *db, unsigned int ms){if (db->in_suspend)mdelay(ms);elsemsleep(ms);}/* *   Read a word from phyxcer */static intdm9000_phy_read(struct net_device *dev, int phy_reg_unused, int reg){board_info_t *db = netdev_priv(dev);unsigned long flags;unsigned int reg_save;int ret;mutex_lock(&db->addr_lock);spin_lock_irqsave(&db->lock,flags);/* Save previous register address */reg_save = readb(db->io_addr);/* Fill the phyxcer register into REG_0C */iow(db, DM9000_EPAR, DM9000_PHY | reg);iow(db, DM9000_EPCR, EPCR_ERPRR | EPCR_EPOS);/* Issue phyxcer read command */writeb(reg_save, db->io_addr);spin_unlock_irqrestore(&db->lock,flags);dm9000_msleep(db, 1);/* Wait read complete */spin_lock_irqsave(&db->lock,flags);reg_save = readb(db->io_addr);iow(db, DM9000_EPCR, 0x0);/* Clear phyxcer read command *//* The read data keeps on REG_0D & REG_0E */ret = (ior(db, DM9000_EPDRH) << 8) | ior(db, DM9000_EPDRL);/* restore the previous address */writeb(reg_save, db->io_addr);spin_unlock_irqrestore(&db->lock,flags);mutex_unlock(&db->addr_lock);dm9000_dbg(db, 5, "phy_read[%02x] -> %04x\n", reg, ret);return ret;}/* *   Write a word to phyxcer */static voiddm9000_phy_write(struct net_device *dev, int phyaddr_unused, int reg, int value){board_info_t *db = netdev_priv(dev);unsigned long flags;unsigned long reg_save;dm9000_dbg(db, 5, "phy_write[%02x] = %04x\n", reg, value);mutex_lock(&db->addr_lock);spin_lock_irqsave(&db->lock,flags);/* Save previous register address */reg_save = readb(db->io_addr);/* Fill the phyxcer register into REG_0C */iow(db, DM9000_EPAR, DM9000_PHY | reg);/* Fill the written data into REG_0D & REG_0E */iow(db, DM9000_EPDRL, value);iow(db, DM9000_EPDRH, value >> 8);iow(db, DM9000_EPCR, EPCR_EPOS | EPCR_ERPRW);/* Issue phyxcer write command */writeb(reg_save, db->io_addr);spin_unlock_irqrestore(&db->lock, flags);dm9000_msleep(db, 1);/* Wait write complete */spin_lock_irqsave(&db->lock,flags);reg_save = readb(db->io_addr);iow(db, DM9000_EPCR, 0x0);/* Clear phyxcer write command *//* restore the previous address */writeb(reg_save, db->io_addr);spin_unlock_irqrestore(&db->lock, flags);mutex_unlock(&db->addr_lock);}static voiddm9000_shutdown(struct net_device *dev){board_info_t *db = netdev_priv(dev);/* RESET device */dm9000_phy_write(dev, 0, MII_BMCR, BMCR_RESET);/* PHY RESET */iow(db, DM9000_GPR, 0x01);/* Power-Down PHY */iow(db, DM9000_IMR, IMR_PAR);/* Disable all interrupt */iow(db, DM9000_RCR, 0x00);/* Disable RX */}/* * Stop the interface. * The interface is stopped when it is brought. */static intdm9000_stop(struct net_device *ndev){board_info_t *db = netdev_priv(ndev);if (netif_msg_ifdown(db))dev_dbg(db->dev, "shutting down %s\n", ndev->name);cancel_delayed_work_sync(&db->phy_poll);netif_stop_queue(ndev);netif_carrier_off(ndev);/* free interrupt */free_irq(ndev->irq, ndev);dm9000_shutdown(ndev);return 0;}static const struct net_device_ops dm9000_netdev_ops = {.ndo_open= dm9000_open,.ndo_stop= dm9000_stop,.ndo_start_xmit= dm9000_start_xmit,.ndo_tx_timeout= dm9000_timeout,.ndo_set_multicast_list= dm9000_hash_table,.ndo_do_ioctl= dm9000_ioctl,.ndo_change_mtu= eth_change_mtu,.ndo_validate_addr= eth_validate_addr,.ndo_set_mac_address= eth_mac_addr,#ifdef CONFIG_NET_POLL_CONTROLLER.ndo_poll_controller= dm9000_poll_controller,#endif};/* * Search DM9000 board, allocate space and register it */static int __devinitdm9000_probe(struct platform_device *pdev){struct dm9000_plat_data *pdata = pdev->dev.platform_data;struct board_info *db;/* Point a board information structure */struct net_device *ndev;const unsigned char *mac_src;int ret = 0;int iosize;int i;u32 id_val;/* Init network device */ndev = alloc_etherdev(sizeof(struct board_info));if (!ndev) {dev_err(&pdev->dev, "could not allocate device.\n");return -ENOMEM;}SET_NETDEV_DEV(ndev, &pdev->dev);dev_dbg(&pdev->dev, "dm9000_probe()\n");/* setup board info structure */db = netdev_priv(ndev);db->dev = &pdev->dev;db->ndev = ndev;spin_lock_init(&db->lock);mutex_init(&db->addr_lock);INIT_DELAYED_WORK(&db->phy_poll, dm9000_poll_work);db->addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);db->data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);db->irq_res  = platform_get_resource(pdev, IORESOURCE_IRQ, 0);if (db->addr_res == NULL || db->data_res == NULL ||    db->irq_res == NULL) {dev_err(db->dev, "insufficient resources\n");ret = -ENOENT;goto out;}db->irq_wake = platform_get_irq(pdev, 1);if (db->irq_wake >= 0) {dev_dbg(db->dev, "wakeup irq %d\n", db->irq_wake);ret = request_irq(db->irq_wake, dm9000_wol_interrupt,  IRQF_SHARED, dev_name(db->dev), ndev);if (ret) {dev_err(db->dev, "cannot get wakeup irq (%d)\n", ret);} else {/* test to see if irq is really wakeup capable */ret = set_irq_wake(db->irq_wake, 1);if (ret) {dev_err(db->dev, "irq %d cannot set wakeup (%d)\n",db->irq_wake, ret);ret = 0;} else {set_irq_wake(db->irq_wake, 0);db->wake_supported = 1;}}}iosize = resource_size(db->addr_res);db->addr_req = request_mem_region(db->addr_res->start, iosize,  pdev->name);if (db->addr_req == NULL) {dev_err(db->dev, "cannot claim address reg area\n");ret = -EIO;goto out;}db->io_addr = ioremap(db->addr_res->start, iosize);if (db->io_addr == NULL) {dev_err(db->dev, "failed to ioremap address reg\n");ret = -EINVAL;goto out;}iosize = resource_size(db->data_res);db->data_req = request_mem_region(db->data_res->start, iosize,  pdev->name);if (db->data_req == NULL) {dev_err(db->dev, "cannot claim data reg area\n");ret = -EIO;goto out;}db->io_data = ioremap(db->data_res->start, iosize);if (db->io_data == NULL) {dev_err(db->dev, "failed to ioremap data reg\n");ret = -EINVAL;goto out;}/* fill in parameters for net-dev structure */ndev->base_addr = (unsigned long)db->io_addr;ndev->irq= db->irq_res->start;/* ensure at least we have a default set of IO routines */dm9000_set_io(db, iosize);/* check to see if anything is being over-ridden */if (pdata != NULL) {/* check to see if the driver wants to over-ride the * default IO width */if (pdata->flags & DM9000_PLATF_8BITONLY)dm9000_set_io(db, 1);if (pdata->flags & DM9000_PLATF_16BITONLY)dm9000_set_io(db, 2);if (pdata->flags & DM9000_PLATF_32BITONLY)dm9000_set_io(db, 4);/* check to see if there are any IO routine * over-rides */if (pdata->inblk != NULL)db->inblk = pdata->inblk;if (pdata->outblk != NULL)db->outblk = pdata->outblk;if (pdata->dumpblk != NULL)db->dumpblk = pdata->dumpblk;db->flags = pdata->flags;}#ifdef CONFIG_DM9000_FORCE_SIMPLE_PHY_POLLdb->flags |= DM9000_PLATF_SIMPLE_PHY;#endifdm9000_reset(db);/* try multiple times, DM9000 sometimes gets the read wrong */for (i = 0; i < 8; i++) {id_val  = ior(db, DM9000_VIDL);id_val |= (u32)ior(db, DM9000_VIDH) << 8;id_val |= (u32)ior(db, DM9000_PIDL) << 16;id_val |= (u32)ior(db, DM9000_PIDH) << 24;if (id_val == DM9000_ID)break;dev_err(db->dev, "read wrong id 0x%08x\n", id_val);}if (id_val != DM9000_ID) {dev_err(db->dev, "wrong id: 0x%08x\n", id_val);ret = -ENODEV;goto out;}/* Identify what type of DM9000 we are working on */id_val = ior(db, DM9000_CHIPR);dev_dbg(db->dev, "dm9000 revision 0x%02x\n", id_val);switch (id_val) {case CHIPR_DM9000A:db->type = TYPE_DM9000A;break;case CHIPR_DM9000B:db->type = TYPE_DM9000B;break;default:dev_dbg(db->dev, "ID %02x => defaulting to DM9000E\n", id_val);db->type = TYPE_DM9000E;}/* dm9000a/b are capable of hardware checksum offload */if (db->type == TYPE_DM9000A || db->type == TYPE_DM9000B) {db->can_csum = 1;db->rx_csum = 1;ndev->features |= NETIF_F_IP_CSUM;}/* from this point we assume that we have found a DM9000 *//* driver system function */ether_setup(ndev);ndev->netdev_ops= &dm9000_netdev_ops;ndev->watchdog_timeo= msecs_to_jiffies(watchdog);ndev->ethtool_ops= &dm9000_ethtool_ops;db->msg_enable       = NETIF_MSG_LINK;db->mii.phy_id_mask  = 0x1f;db->mii.reg_num_mask = 0x1f;db->mii.force_media  = 0;db->mii.full_duplex  = 0;db->mii.dev     = ndev;db->mii.mdio_read    = dm9000_phy_read;db->mii.mdio_write   = dm9000_phy_write;mac_src = "eeprom";/* try reading the node address from the attached EEPROM */for (i = 0; i < 6; i += 2)dm9000_read_eeprom(db, i / 2, ndev->dev_addr+i);/* try MAC address passed by kernel command line */if (!is_valid_ether_addr(ndev->dev_addr) && pdata != NULL) {mac_src = "param data";memcpy(ndev->dev_addr, pdata->param_addr, 6);}if (!is_valid_ether_addr(ndev->dev_addr)) {/* try reading from mac */mac_src = "chip";for (i = 0; i < 6; i++)ndev->dev_addr[i] = ior(db, i+DM9000_PAR);}if (!is_valid_ether_addr(ndev->dev_addr) && pdata != NULL) {mac_src = "platform data";memcpy(ndev->dev_addr, pdata->dev_addr, 6);}if (!is_valid_ether_addr(ndev->dev_addr))dev_warn(db->dev, "%s: Invalid ethernet MAC address. Please " "set using ifconfig\n", ndev->name);platform_set_drvdata(pdev, ndev);ret = register_netdev(ndev);if (ret == 0)printk(KERN_INFO "%s: dm9000%c at %p,%p IRQ %d MAC: %pM (%s)\n",       ndev->name, dm9000_type_to_char(db->type),       db->io_addr, db->io_data, ndev->irq,       ndev->dev_addr, mac_src);return 0;out:dev_err(db->dev, "not found (%d).\n", ret);dm9000_release_board(pdev, db);free_netdev(ndev);return ret;}static intdm9000_drv_suspend(struct device *dev){struct platform_device *pdev = to_platform_device(dev);struct net_device *ndev = platform_get_drvdata(pdev);board_info_t *db;if (ndev) {db = netdev_priv(ndev);db->in_suspend = 1;if (!netif_running(ndev))return 0;netif_device_detach(ndev);/* only shutdown if not using WoL */if (!db->wake_state)dm9000_shutdown(ndev);}return 0;}static intdm9000_drv_resume(struct device *dev){struct platform_device *pdev = to_platform_device(dev);struct net_device *ndev = platform_get_drvdata(pdev);board_info_t *db = netdev_priv(ndev);if (ndev) {if (netif_running(ndev)) {/* reset if we were not in wake mode to ensure if * the device was powered off it is in a known state */if (!db->wake_state) {dm9000_reset(db);dm9000_init_dm9000(ndev);}netif_device_attach(ndev);}db->in_suspend = 0;}return 0;}static const struct dev_pm_ops dm9000_drv_pm_ops = {.suspend= dm9000_drv_suspend,.resume= dm9000_drv_resume,};static int __devexitdm9000_drv_remove(struct platform_device *pdev){struct net_device *ndev = platform_get_drvdata(pdev);platform_set_drvdata(pdev, NULL);unregister_netdev(ndev);dm9000_release_board(pdev, netdev_priv(ndev));free_netdev(ndev);/* free device structure */dev_dbg(&pdev->dev, "released and freed device\n");return 0;}static struct platform_driver dm9000_driver = {.driver= {.name    = "dm9000",.owner = THIS_MODULE,.pm = &dm9000_drv_pm_ops,},.probe   = dm9000_probe,.remove  = __devexit_p(dm9000_drv_remove),};static int __initdm9000_init(void){printk(KERN_INFO "%s Ethernet Driver, V%s\n", CARDNAME, DRV_VERSION);return platform_driver_register(&dm9000_driver);}static void __exitdm9000_cleanup(void){platform_driver_unregister(&dm9000_driver);}module_init(dm9000_init);module_exit(dm9000_cleanup);MODULE_AUTHOR("Sascha Hauer, Ben Dooks");MODULE_DESCRIPTION("Davicom DM9000 network driver");MODULE_LICENSE("GPL");MODULE_AL

测试
arm 192.168.1.18
pc  192.168.1.56

//netasist发送 abcd
//arm接收

DBG(drivers/net/dm9000.c, dm9000_rx(), 1075): 打印skb里的数据 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[0]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[1]=1 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[2]=8 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[3]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[4]=6 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[5]=4 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[6]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[7]=1 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[8]=c8 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[9]=60 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[10]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[11]=c7 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[12]=e DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[13]=76 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[14]=c0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[15]=a8 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[16]=1 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[17]=38 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[18]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[19]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[20]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[21]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[22]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[23]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[24]=c0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[25]=a8 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[26]=1 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[27]=1 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[28]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[29]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[30]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[31]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[32]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[33]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[34]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[35]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[36]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[37]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[38]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[39]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[40]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[41]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[42]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[43]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[44]=0 DBG(drivers/net/dm9000.c, dm9000_rx(), 1079): skb->data[45]=0

wireshark监视到pc上发送出去的数据


0000  10 23 45 67 89 ab c8 60  00 c7 0e 76 08 0045 00  .#Eg...` ...v..E.
0010  00 20 65 69 00 00 40 11  91 33 c0 a8 01 38 c0 a8   . ei..@. .3...8..
0020  01 a8 0d 05 0d 05 00 0c  9c d4 61 62 63 64         ........ ..abcd  


//arm发送 a
//asist接收

a DBG(client_udp.c, main(), 82):  DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 922): 打印skb里的数据 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[0]=c8 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[1]=60 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[2]=0 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[3]=c7 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[4]=e DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[5]=76 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[6]=10 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[7]=23 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[8]=45 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[9]=67 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[10]=89 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[11]=ab DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[12]=8 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[13]=0 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[14]=45 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[15]=0 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[16]=0 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[17]=1d DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[18]=0 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[19]=0 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[20]=40 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[21]=0 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[22]=40 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[23]=11 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[24]=b6 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[25]=9f DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[26]=c0 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[27]=a8 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[28]=1 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[29]=a8 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[30]=c0 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[31]=a8 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[32]=1 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[33]=38 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[34]=e9 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[35]=50 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[36]=d DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[37]=5 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[38]=0 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[39]=9 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[40]=84 DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[41]=4b DBG(drivers/net/dm9000.c, dm9000_start_xmit(), 926): skb->data[42]=61ch=61 DBG(client_udp.c, main(), 88): send sucessful

wireshark监视pc上接收到的数据


0000  c8 60 00 c7 0e 76 10 23  45 67 89 ab 08 00 45 00  .`...v.# Eg....E.
0010  00 1d 00 00 40 00 40 11  b6 9f c0 a8 01 a8 c0 a8   ....@.@. ........
0020  01 38 e9 50 0d 05 00 09  24 55 61 00 00 00 00 00   .8.P.... $Ua.....
0030  00 00 00 00 00 00 00 00  00 00 00 00               ........ ....    




从上可以看出，skb->data里的数据就是一个完整地以太网包，包括了源目的mac，源目的ip，源目的port，数据等。
有个疑问，，，答案见
http://topic.csdn.net/u/20120815/14/f7a046c4-8d81-4c92-913d-98cb436442e5.html