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TFTP: allow for adjustable retransmission timout

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So far, TFTP negotiated a fixed retransmission timeout of 5 seconds.
In some cases (busy networks, slow TFTP servers) this caused very
slow transfers. A new environment variable "tftptimeout" allows to
set this timeout. Lowering this value may make downloads succeed
faster in networks with high packet loss rates or with unreliable
TFTP servers.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Ben Warren <biggerbadderben@gmail.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
This commit is contained in:
Wolfgang Denk 2010-01-17 23:55:53 +01:00
parent 252b404d95
commit c96f86eefc
2 changed files with 34 additions and 8 deletions
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19
README
View file

@ -3005,7 +3005,9 @@ environment. As long as you don't save the environment you are
working with an in-memory copy. In case the Flash area containing the
environment is erased by accident, a default environment is provided.
Some configuration options can be set using Environment Variables:
Some configuration options can be set using Environment Variables.
List of environment variables (most likely not complete):
baudrate - see CONFIG_BAUDRATE
@ -3117,7 +3119,7 @@ Some configuration options can be set using Environment Variables:
available network interfaces.
It just stays at the currently selected interface.
netretry - When set to "no" each network operation will
netretry - When set to "no" each network operation will
either succeed or fail without retrying.
When set to "once" the network operation will
fail when all the available network interfaces
@ -3133,7 +3135,18 @@ Some configuration options can be set using Environment Variables:
tftpdstport - If this is set, the value is used for TFTP's UDP
destination port instead of the Well Know Port 69.
vlan - When set to a value < 4095 the traffic over
tftpblocksize - Block size to use for TFTP transfers; if not set,
we use the TFTP server's default block size
tftptimeout - Retransmission timeout for TFTP packets (in milli-
seconds, minimum value is 1000 = 1 second). Defines
when a packet is considered to be lost so it has to
be retransmitted. The default is 5000 = 5 seconds.
Lowering this value may make downloads succeed
faster in networks with high packet loss rates or
with unreliable TFTP servers.
vlan - When set to a value < 4095 the traffic over
Ethernet is encapsulated/received over 802.1q
VLAN tagged frames.

23
net/tftp.c
View file

@ -211,7 +211,7 @@ TftpSend (void)
pkt += 5 /*strlen("octet")*/ + 1;
strcpy ((char *)pkt, "timeout");
pkt += 7 /*strlen("timeout")*/ + 1;
sprintf((char *)pkt, "%lu", TIMEOUT / 1000);
sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
debug("send option \"timeout %s\"\n", (char *)pkt);
pkt += strlen((char *)pkt) + 1;
#ifdef CONFIG_TFTP_TSIZE
@ -413,7 +413,6 @@ TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
}
TftpLastBlock = TftpBlock;
TftpTimeoutMSecs = TIMEOUT;
TftpTimeoutCountMax = TIMEOUT_COUNT;
NetSetTimeout (TftpTimeoutMSecs, TftpTimeout);
@ -528,10 +527,25 @@ TftpStart (void)
{
char *ep; /* Environment pointer */
/* Allow the user to choose tftpblocksize */
/*
* Allow the user to choose TFTP blocksize and timeout.
* TFTP protocol has a minimal timeout of 1 second.
*/
if ((ep = getenv("tftpblocksize")) != NULL)
TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
debug("tftp block size is %i\n", TftpBlkSizeOption);
if ((ep = getenv("tftptimeout")) != NULL)
TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
if (TftpTimeoutMSecs < 1000) {
printf("TFTP timeout (%ld ms) too low, "
"set minimum = 1000 ms\n",
TftpTimeoutMSecs);
TftpTimeoutMSecs = 1000;
}
debug("TFTP blocksize = %i, timeout = %ld ms\n",
TftpBlkSizeOption, TftpTimeoutMSecs);
TftpServerIP = NetServerIP;
if (BootFile[0] == '\0') {
@ -588,7 +602,6 @@ TftpStart (void)
puts ("Loading: *\b");
TftpTimeoutMSecs = TftpRRQTimeoutMSecs;
TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
NetSetTimeout (TftpTimeoutMSecs, TftpTimeout);