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[dhcp] Extract timing parameters out to config/dhcp.h

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iPXE uses DHCP timeouts loosely based on values recommended by the
specification, but often abbreviated to reduce timeouts for reliable
and/or simple network topologies.  Extract the DHCP timing parameters
to config/dhcp.h and document them.  The resulting default iPXE
behavior is exactly the same, but downstreams are now afforded the
opportunity to implement spec-compliant behavior via config file
overrides.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Alex Williamson
2015-01-26 10:54:29 -07:00
committed by Michael Brown
parent 5350b65a3c
commit 47aebc24d3
3 changed files with 106 additions and 23 deletions
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10
src/include/ipxe/dhcp.h
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@@ -639,16 +639,6 @@ struct dhcphdr {
*/
#define DHCP_MIN_LEN 552
/** Timeouts for sending DHCP packets */
#define DHCP_MIN_TIMEOUT ( 1 * TICKS_PER_SEC )
#define DHCP_MAX_TIMEOUT ( 10 * TICKS_PER_SEC )
/** Maximum time that we will wait for ProxyDHCP responses */
#define PROXYDHCP_MAX_TIMEOUT ( 2 * TICKS_PER_SEC )
/** Maximum time that we will wait for Boot Server responses */
#define PXEBS_MAX_TIMEOUT ( 3 * TICKS_PER_SEC )
/** Settings block name used for DHCP responses */
#define DHCP_SETTINGS_NAME "dhcp"