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net: Make TFTP server timeout configurable

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There are two aspects of a TFTP transfer involving timeouts:
1. timeout waiting for initial server reply after sending RRQ
2. timeouts while transferring actual data from the server

Since the upcoming auto-update feature attempts a TFTP download during each
boot, it is undesirable to have a long delay when the TFTP server is not
available. Thus, this commit makes the server timeout (1.) configurable by two
global variables:

TftpRRQTimeoutMSecs
TftpRRQTimeoutCountMax

TftpRRQTimeoutMSecs overrides default timeout when trying to connect to a TFTP
server, TftpRRQTimeoutCountMax overrides default number of connection retries.
The total delay when trying to download a file from a non-existing TFTP server
is TftpRRQTimeoutMSecs x TftpRRQTimeoutCountMax milliseconds.

Timeouts during file transfers (2.) are unaffected.

Signed-off-by: Rafal Czubak <rcz@semihalf.com>
Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
This commit is contained in:
Bartlomiej Sieka 2008-10-01 15:26:29 +02:00 committed by Wolfgang Denk
parent 49f3bdbba8
commit e83cc06375
1 changed files with 24 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
net/tftp.c
View file

@ -34,6 +34,21 @@
#define TFTP_ERROR 5
#define TFTP_OACK 6
static ulong TftpTimeoutMSecs = TIMEOUT;
static int TftpTimeoutCountMax = TIMEOUT_COUNT;
/*
* These globals govern the timeout behavior when attempting a connection to a
* TFTP server. TftpRRQTimeoutMSecs specifies the number of milliseconds to
* wait for the server to respond to initial connection. Second global,
* TftpRRQTimeoutCountMax, gives the number of such connection retries.
* TftpRRQTimeoutCountMax must be non-negative and TftpRRQTimeoutMSecs must be
* positive. The globals are meant to be set (and restored) by code needing
* non-standard timeout behavior when initiating a TFTP transfer.
*/
ulong TftpRRQTimeoutMSecs = TIMEOUT;
int TftpRRQTimeoutCountMax = TIMEOUT_COUNT;
static IPaddr_t TftpServerIP;
static int TftpServerPort; /* The UDP port at their end */
static int TftpOurPort; /* The UDP port at our end */
@ -370,7 +385,9 @@ TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
}
TftpLastBlock = TftpBlock;
NetSetTimeout (TIMEOUT, TftpTimeout);
TftpTimeoutMSecs = TIMEOUT;
TftpTimeoutCountMax = TIMEOUT_COUNT;
NetSetTimeout (TftpTimeoutMSecs, TftpTimeout);
store_block (TftpBlock - 1, pkt + 2, len);
@ -441,7 +458,7 @@ TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
static void
TftpTimeout (void)
{
if (++TftpTimeoutCount > TIMEOUT_COUNT) {
if (++TftpTimeoutCount > TftpTimeoutCountMax) {
puts ("\nRetry count exceeded; starting again\n");
#ifdef CONFIG_MCAST_TFTP
mcast_cleanup();
@ -449,7 +466,7 @@ TftpTimeout (void)
NetStartAgain ();
} else {
puts ("T ");
NetSetTimeout (TIMEOUT, TftpTimeout);
NetSetTimeout (TftpTimeoutMSecs, TftpTimeout);
TftpSend ();
}
}
@ -520,7 +537,10 @@ TftpStart (void)
puts ("Loading: *\b");
NetSetTimeout (TIMEOUT, TftpTimeout);
TftpTimeoutMSecs = TftpRRQTimeoutMSecs;
TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
NetSetTimeout (TftpTimeoutMSecs, TftpTimeout);
NetSetHandler (TftpHandler);
TftpServerPort = WELL_KNOWN_PORT;