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net: make ARP timeout configurable 

Currently the timeout waiting for an ARP reply is hard set to 5 seconds.
On i.MX31ADS due to a hardware "strangeness" up to four first IP packets
to the boards get lost, which typically are ARP replies. By configuring
the timeout to a lower value we significantly improve the first network
transfer time on this board. The timeout is specified in milliseconds,
later internally it is converted to deciseconds, because it has to be
converted to hardware ticks, and CFG_HZ ranges from 900 to 27000000 on
different boards.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
This commit is contained in:
Guennadi Liakhovetski 2008-04-03 17:04:19 +02:00 committed by Ben Warren
parent 13e0b8f7ca
commit 40cb90ee2b
2 changed files with 22 additions and 7 deletions
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4
README
View File

@ -1561,6 +1561,10 @@ The following options need to be configured:
before giving up the operation. If not defined, a
default value of 5 is used.
CONFIG_ARP_TIMEOUT
Timeout waiting for an ARP reply in milliseconds.
- Command Interpreter:
CONFIG_AUTO_COMPLETE

25
net/net.c
View File

@ -94,11 +94,22 @@
DECLARE_GLOBAL_DATA_PTR;
#define ARP_TIMEOUT 5UL /* Seconds before trying ARP again */
#ifndef CONFIG_NET_RETRY_COUNT
# define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
#ifndef CONFIG_ARP_TIMEOUT
# define ARP_TIMEOUT 50UL /* Deciseconds before trying ARP again */
#elif (CONFIG_ARP_TIMEOUT < 100)
# error "Due to possible overflow CONFIG_ARP_TIMEOUT must be greater than 100ms"
#else
# define ARP_TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
# if (CONFIG_ARP_TIMEOUT % 100)
# warning "Supported ARP_TIMEOUT precision is 100ms"
# endif
# define ARP_TIMEOUT (CONFIG_ARP_TIMEOUT / 100)
#endif
#ifndef CONFIG_NET_RETRY_COUNT
# define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
#else
# define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT
#endif
#if 0
@ -129,7 +140,7 @@ uchar NetOurEther[6]; /* Our ethernet address */
uchar NetServerEther[6] = /* Boot server enet address */
{ 0, 0, 0, 0, 0, 0 };
IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */
IPaddr_t NetServerIP; /* Our IP addr (0 = unknown) */
IPaddr_t NetServerIP; /* Server IP addr (0 = unknown) */
volatile uchar *NetRxPkt; /* Current receive packet */
int NetRxPktLen; /* Current rx packet length */
unsigned NetIPID; /* IP packet ID */
@ -253,7 +264,7 @@ void ArpTimeoutCheck(void)
t = get_timer(0);
/* check for arp timeout */
if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ / 10) {
NetArpWaitTry++;
if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
@ -494,7 +505,7 @@ restart:
* Check the ethernet for a new packet. The ethernet
* receive routine will process it.
*/
eth_rx();
eth_rx();
/*
* Abort if ctrl-c was pressed.