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[dhcp] Limit maximum number of DHCP discovery deferrals

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For switches which remain permanently in the non-forwarding state (or
which erroneously report a non-forwarding state), ensure that iPXE
will eventually give up waiting for the link to become unblocked.

Originally-fixed-by: Wissam Shoukair <wissams@mellanox.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-11-10 14:05:46 +00:00
parent d5f7ee60e7
commit ed0d7c4f6f
2 changed files with 12 additions and 2 deletions
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6
src/config/dhcp.h
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@@ -24,6 +24,12 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
//#define DHCP_DISC_START_TIMEOUT_SEC 4 /* as per PXE spec */
//#define DHCP_DISC_END_TIMEOUT_SEC 32 /* as per PXE spec */
/*
* Maximum number of discovery deferrals due to blocked links
* (e.g. from non-forwarding STP ports)
*/
#define DHCP_DISC_MAX_DEFERRALS 60
/*
* ProxyDHCP offers are given precedence by continue to wait for them
* after a valid DHCPOFFER is received. We'll wait through this