给Hi3518e的Uboot添加UDP广播收发功能

基于个人兴趣，决定实现一个和方案公司提供的uboot收发广播的功能。记录笔记如下。

SDK版本：Hi3518E_V100R001C01SPC081

1. 由于我手头的板子的Phy是RMII模式，因此先按这篇帖子进行将uboot默认的网络驱动改为RMII模式。

http://blog.csdn.net/skdkjzz/article/details/39931915

2. 然后设置好Phy的CONFIG_PHY_ADDR_U和CONFIG_PHY_ADDR_D，这个我不太懂是为什么，估计和硬件有关，各位看官可能这里不能完全照抄，我有空翻一翻Phy的规格书。编辑 u-boot-2010.06\include\configs\hi3518e.h

3. 在common目录下新建文件cmd_udp.c，新建一个uboot cmd

 #include <common.h>
 #include <command.h>
 #include <net.h>

  char _ctoi(char c)
 {
     if(c>=''&&c<='')return c-'';
     if(c>='a'&&c<='f')return c-'a'+;
     return ;
 }

 int _atoi(char* s)
 {
     unsigned int  a=;
     unsigned int  b=;
     int i=;
     while(s[i]){
         a*=;
         a+=_ctoi(s[i]);
         i++;
     }
     return a;
 }

 int _atox(char* s)
 {
     unsigned int  a=;
     unsigned int  b=;
     int i=;
     while(s[i]){
         a<<=;
         a|=_ctoi(s[i]);
         i++;
         if(i>=)break;
     }
     return a;
 }

 int _strlen(char*s)
 {
     int i=;
     while(s[i]){
         i++;
     }
     return i;
 }

 void _getmac(char* s,char* eth)
 {
     unsigned char  a=;
     int i=;
     while(s[i]){
         a<<=;
         a|=_ctoi(s[i]);
         if((i&)==){
             eth[i>>]=a;
             a=;
         }
         i++;
     }
 }

 int do_udp_broadcast(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {
     uchar eth[]= {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
     char* UdpServerIP="255.255.255.255";
     int dest_port = , src_port =;
     uchar *str;
     int len;

     switch(argc){
     case :
         puts("Params error, try again\nusage: [udp_b] [string] or [udp_b] [dest_port] [src_port] [string]\n");
         return ;
         break;
     case :
         str = argv[];
         len = strlen(str);
         break;
     case :
         dest_port = _atoi(argv[]);
         src_port = _atoi(argv[]);
         str = argv[];
         len = strlen(argv[]);
         break;
     default:
         return ;
         break;
     }

     printf("len=%d\n",len);
     show_boot_progress();
     if(NetLoop_UDP(eth,UdpServerIP,dest_port,src_port,str,len)<){
         show_boot_progress(-);
         return ;
     }

     return ;
 }

 U_BOOT_CMD(
     udp_b, , , do_udp_broadcast,
     "Send or receive UDP broadcast to/from server using UDP protocol",
     "[udp_b] [string] or [udp_b] [dest_port] [src_port] [string]"
 );

4. 给common目录的makefile添加

COBJS-$(CONFIG_CMD_UDP) += cmd_udp.o

5. 在net目录新建文件udp处理函数，udp.c和udp.h

udp.c

 #include <common.h>
 #include <watchdog.h>
 #include <command.h>
 #include <net.h>
 #include <miiphy.h>
 #include "udp.h"

 void
 UdpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len)  //这个函数是处理包，先放下，有空再写
 {
     //printf("handler udp packet\n");
     printf("Receive udp packet: %s\n",pkt);
 }

 void
 udpSend(void)
 {
     uchar *pkt;
     pkt = (uchar *)NetTxPacket;
     pkt += NetSetEther(pkt, UdpServerEther, PROT_IP);
     NetSetIP (pkt, UdpServerIP, UdpServerPort, UdpOurPort, data_len);
     pkt += IP_HDR_SIZE;
     memcpy(pkt, pkt_data, data_len);
     (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + data_len);
 }

 void
 UdpStart(const uchar *remoteeth, char *remoteip, int remoteport,int thisport, const char *data, int datalength)
 {
     UdpServerEther = remoteeth;
     UdpServerIP = string_to_ip(remoteip);
     UdpServerPort = remoteport;
     UdpOurPort = thisport;
     pkt_data = data;
     data_len = datalength;

     udpSend();
     printf("Send,ready to receive...\n");
 }

udp.h

 #ifndef __UDP_H__
 #define __UDP_H__

 static uchar *UdpServerEther;
 static IPaddr_t UdpServerIP;
 static int UdpServerPort;/* The UDP port at their end
 */
 static int UdpOurPort;/* The UDP port at our end
 */
 static uchar *pkt_data;
 static int data_len;

 void UdpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len);

 #endif

5. 修改net目录的net.c，在最下面加入NetLoop_UDP函数，并添加udp.h头文件引用 #include "udp.h"

 int
 NetLoop_UDP(const uchar* remorteth, char* remoteip, int remoteport, int thisport, const char* data, int datalength)
 {
     bd_t *bd = gd->bd;

     /* XXX problem with bss workaround */
     NetTxPacket = NULL;

     if (!NetTxPacket){
         int i;
         /*
         * Setup packet buffers, aligned correctly.
         */
         NetTxPacket = &PktBuf[] + (PKTALIGN - );
         NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
         for (i = ; i < PKTBUFSRX; i++) {
             NetRxPackets[i] = NetTxPacket + (i+)*PKTSIZE_ALIGN;
         }
     } 

     eth_halt();
     if (eth_init(bd) < ) {
         eth_halt();
         return(-);
     }

     restart:
     eth_getenv_enetaddr("ethaddr", NetOurEther);
     /*
     * Start the ball rolling with the given start function.  From
     * here on, this code is a state machine driven by received
     * packets and timer events.
     */
     NetInitLoop(TFTP);

     switch (net_check_prereq (TFTP)) {
         case :
         /* network not configured */
         eth_halt();
         return (-);

         case :
         NetSetHandler(UdpHandler);
         UdpStart(remorteth,remoteip, remoteport, thisport, data, datalength);
         break;
     }

     /*
     * Main packet reception loop.  Loop receiving packets until
     * someone sets `NetState' to a state that terminates.
     */
     for (;;) {
         /*
         * Check the ethernet for a new packet.  The ethernet
         * receive routine will process it.
         */
         eth_rx();
         NetSetHandler(UdpHandler);

         /*
         * Abort if ctrl-c was pressed.
         */
         if (ctrlc()) {
             eth_halt();
             puts ("\nAbort by Ctrl+C\n");
             return (-);
         }
     }
 }

6. 修改net目录下的makefile，添加

COBJS-$(CONFIG_CMD_NET)  += udp.o

7. 这样操作后可以通过udp_b命令发送和接收UDP广播了。实际跑在板子上能发送UDP广播，但接收不到UDP广播包。

经过查看芯片规格书之后，发现有寄存器可以屏蔽广播包，我们查看uboot网络驱动源码之后发现确实默认将UDP广播包屏蔽了。

那么我们修改\drivers\net\hisfv300下的glb.c

将
hieth_writel_bits(ld, 0, GLB_MACTCTRL, BITS_BROAD2CPU_UP);
修改为
hieth_writel_bits(ld, 1, GLB_MACTCTRL, BITS_BROAD2CPU_UP);

8. 修改部分到此结束，现在我们进行测试。我采用的测试工具是我自己用c#写的udp收发小工具，源码就不发了，很简单的小工具。

参考链接：

http://blog.csdn.net/skdkjzz/article/details/39931915

https://segmentfault.com/a/1190000005273491

http://www.ithao123.cn/content-10639610.html