Commit e83cc063 authored by Bartlomiej Sieka's avatar Bartlomiej Sieka Committed by Wolfgang Denk

net: Make TFTP server timeout configurable

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 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: default avatarRafal Czubak <>
Signed-off-by: default avatarBartlomiej Sieka <>
Signed-off-by: default avatarBen Warren <>
parent 49f3bdbb
......@@ -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");
......@@ -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;
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