94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
#ifndef CONFIG_DHCP_H
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#define CONFIG_DHCP_H
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/** @file
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*
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* DHCP configuration
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <config/defaults.h>
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/*
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* DHCP and PXE Boot Server timeout parameters
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*
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* Initial and final timeout for DHCP discovery
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*
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* The PXE spec indicates discover request are sent 4 times, with
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* timeouts of 4, 8, 16, 32 seconds. iPXE by default uses 1, 2, 4, 8.
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*/
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#define DHCP_DISC_START_TIMEOUT_SEC 1
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#define DHCP_DISC_END_TIMEOUT_SEC 10
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//#define DHCP_DISC_START_TIMEOUT_SEC 4 /* as per PXE spec */
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//#define DHCP_DISC_END_TIMEOUT_SEC 32 /* as per PXE spec */
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/*
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* Maximum number of discovery deferrals due to blocked links
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* (e.g. from non-forwarding STP ports)
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*/
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#define DHCP_DISC_MAX_DEFERRALS 60
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/*
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* ProxyDHCP offers are given precedence by continue to wait for them
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* after a valid DHCPOFFER is received. We'll wait through this
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* timeout for it. The PXE spec indicates waiting through the 4 & 8
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* second timeouts, iPXE by default stops after 2.
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*/
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#define DHCP_DISC_PROXY_TIMEOUT_SEC 2
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//#define DHCP_DISC_PROXY_TIMEOUT_SEC 11 /* as per PXE spec */
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/*
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* Per the PXE spec, requests are also tried 4 times, but at timeout
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* intervals of 1, 2, 3, 4 seconds. To adapt this to an exponential
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* backoff timer, we can either do 1, 2, 4, 8, ie. 4 retires with a
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* longer interval or start at 0 (0.25s) for 0.25, 0.5, 1, 2, 4,
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* ie. one extra try and shorter initial timeouts. iPXE by default
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* does a combination of both, starting at 0 and going through the 8
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* second timeout.
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*/
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#define DHCP_REQ_START_TIMEOUT_SEC 0
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#define DHCP_REQ_END_TIMEOUT_SEC 10
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//#define DHCP_REQ_END_TIMEOUT_SEC 4 /* as per PXE spec */
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/*
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* A ProxyDHCP offer without PXE options also goes through a request
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* phase using these same parameters, but note the early break below.
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*/
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#define DHCP_PROXY_START_TIMEOUT_SEC 0
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#define DHCP_PROXY_END_TIMEOUT_SEC 10
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//#define DHCP_PROXY_END_TIMEOUT_SEC 8 /* as per PXE spec */
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/*
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* A ProxyDHCP request timeout should not induce a failure condition,
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* so we always want to break before the above set of timers expire.
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* The iPXE default value of 2 breaks at the first timeout after 2
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* seconds, which will be after the 2 second timeout.
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*/
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#define DHCP_REQ_PROXY_TIMEOUT_SEC 2
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//#define DHCP_REQ_PROXY_TIMEOUT_SEC 7 /* as per PXE spec */
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/*
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* Per the PXE spec, a PXE boot server request is also be retried 4
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* times at timeouts of 1, 2, 3, 4. iPXE uses the same timeouts as
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* discovery, 1, 2, 4, 8, but will move on to the next server if
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* available after an elapsed time greater than 3 seconds, therefore
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* effectively only sending 3 tries at timeouts of 1, 2, 4.
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*/
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#define PXEBS_START_TIMEOUT_SEC 1
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#define PXEBS_END_TIMEOUT_SEC 10
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//#define PXEBS_START_TIMEOUT_SEC 0 /* as per PXE spec */
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//#define PXEBS_END_TIMEOUT_SEC 8 /* as per PXE spec */
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/*
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* Increment to the next PXE Boot server, if available, after this
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* this much time has elapsed.
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*/
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#define PXEBS_MAX_TIMEOUT_SEC 3
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//#define PXEBS_MAX_TIMEOUT_SEC 7 /* as per PXE spec */
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#include <config/local/dhcp.h>
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#endif /* CONFIG_DHCP_H */
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