diff options
Diffstat (limited to 'qemu/roms/ipxe/src/config/dhcp.h')
-rw-r--r-- | qemu/roms/ipxe/src/config/dhcp.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/config/dhcp.h b/qemu/roms/ipxe/src/config/dhcp.h new file mode 100644 index 000000000..49fe16b92 --- /dev/null +++ b/qemu/roms/ipxe/src/config/dhcp.h @@ -0,0 +1,87 @@ +#ifndef CONFIG_DHCP_H +#define CONFIG_DHCP_H + +/** @file + * + * DHCP configuration + * + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +#include <config/defaults.h> + +/* + * DHCP and PXE Boot Server timeout parameters + * + * Initial and final timeout for DHCP discovery + * + * The PXE spec indicates discover request are sent 4 times, with + * timeouts of 4, 8, 16, 32 seconds. iPXE by default uses 1, 2, 4, 8. + */ +#define DHCP_DISC_START_TIMEOUT_SEC 1 +#define DHCP_DISC_END_TIMEOUT_SEC 10 +//#define DHCP_DISC_START_TIMEOUT_SEC 4 /* as per PXE spec */ +//#define DHCP_DISC_END_TIMEOUT_SEC 32 /* as per PXE spec */ + +/* + * ProxyDHCP offers are given precedence by continue to wait for them + * after a valid DHCPOFFER is received. We'll wait through this + * timeout for it. The PXE spec indicates waiting through the 4 & 8 + * second timeouts, iPXE by default stops after 2. + */ +#define DHCP_DISC_PROXY_TIMEOUT_SEC 2 +//#define DHCP_DISC_PROXY_TIMEOUT_SEC 11 /* as per PXE spec */ + +/* + * Per the PXE spec, requests are also tried 4 times, but at timeout + * intervals of 1, 2, 3, 4 seconds. To adapt this to an exponential + * backoff timer, we can either do 1, 2, 4, 8, ie. 4 retires with a + * longer interval or start at 0 (0.25s) for 0.25, 0.5, 1, 2, 4, + * ie. one extra try and shorter initial timeouts. iPXE by default + * does a combination of both, starting at 0 and going through the 8 + * second timeout. + */ +#define DHCP_REQ_START_TIMEOUT_SEC 0 +#define DHCP_REQ_END_TIMEOUT_SEC 10 +//#define DHCP_REQ_END_TIMEOUT_SEC 4 /* as per PXE spec */ + +/* + * A ProxyDHCP offer without PXE options also goes through a request + * phase using these same parameters, but note the early break below. + */ +#define DHCP_PROXY_START_TIMEOUT_SEC 0 +#define DHCP_PROXY_END_TIMEOUT_SEC 10 +//#define DHCP_PROXY_END_TIMEOUT_SEC 8 /* as per PXE spec */ + +/* + * A ProxyDHCP request timeout should not induce a failure condition, + * so we always want to break before the above set of timers expire. + * The iPXE default value of 2 breaks at the first timeout after 2 + * seconds, which will be after the 2 second timeout. + */ +#define DHCP_REQ_PROXY_TIMEOUT_SEC 2 +//#define DHCP_REQ_PROXY_TIMEOUT_SEC 7 /* as per PXE spec */ + +/* + * Per the PXE spec, a PXE boot server request is also be retried 4 + * times at timeouts of 1, 2, 3, 4. iPXE uses the same timeouts as + * discovery, 1, 2, 4, 8, but will move on to the next server if + * available after an elapsed time greater than 3 seconds, therefore + * effectively only sending 3 tries at timeouts of 1, 2, 4. + */ +#define PXEBS_START_TIMEOUT_SEC 1 +#define PXEBS_END_TIMEOUT_SEC 10 +//#define PXEBS_START_TIMEOUT_SEC 0 /* as per PXE spec */ +//#define PXEBS_END_TIMEOUT_SEC 8 /* as per PXE spec */ + +/* + * Increment to the next PXE Boot server, if available, after this + * this much time has elapsed. + */ +#define PXEBS_MAX_TIMEOUT_SEC 3 +//#define PXEBS_MAX_TIMEOUT_SEC 7 /* as per PXE spec */ + +#include <config/local/dhcp.h> + +#endif /* CONFIG_DHCP_H */ |