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>='0'&&c<='9')return c-'0';
if(c>='a'&&c<='f')return c-'a'+10;
return 0;
}

int _atoi(char* s)
{
unsigned int  a=0;
unsigned int  b=0;
int i=0;
while(s[i]){
a*=10;
a+=_ctoi(s[i]);
i++;
}
return a;
}

int _atox(char* s)
{
unsigned int  a=0;
unsigned int  b=0;
int i=0;
while(s[i]){
a<<=4;
a|=_ctoi(s[i]);
i++;
if(i>=8)break;
}
return a;
}

int _strlen(char*s)
{
int i=0;
while(s[i]){
i++;
}
return i;
}

void _getmac(char* s,char* eth)
{
unsigned char  a=0;
int i=0;
while(s[i]){
a<<=4;
a|=_ctoi(s[i]);
if((i&1)==1){
eth[i>>1]=a;
a=0;
}
i++;
}
}

int do_udp_broadcast(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
uchar eth[6]= {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
char* UdpServerIP="255.255.255.255";
int dest_port = 25500, src_port =25300;
uchar *str;
int len;

switch(argc){
case 1:
puts("Params error, try again\nusage: [udp_b] [string] or [udp_b] [dest_port] [src_port] [string]\n");
return 1;
break;
case 2:
str = argv[1];
len = strlen(str);
break;
case 4:
dest_port = _atoi(argv[1]);
src_port = _atoi(argv[2]);
str = argv[3];
len = strlen(argv[3]);
break;
default:
return 1;
break;
}

printf("len=%d\n",len);
show_boot_progress(80);
if(NetLoop_UDP(eth,UdpServerIP,dest_port,src_port,str,len)<0){
show_boot_progress(-81);
return 1;
}

return 0;
}

U_BOOT_CMD(
udp_b, 4, 1, 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.o5. 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);

#endif5.
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[0] + (PKTALIGN - 1);
NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
for (i = 0; i < PKTBUFSRX; i++) {
NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
}
}

eth_halt();
if (eth_init(bd) < 0) {
eth_halt();
return(-1);
}

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 1:
/* network not configured */
eth_halt();
return (-1);

case 0:
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 (-1);
}
}
}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