| #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 */ |
| |
| /* |
| * Maximum number of discovery deferrals due to blocked links |
| * (e.g. from non-forwarding STP ports) |
| */ |
| #define DHCP_DISC_MAX_DEFERRALS 180 |
| |
| /* |
| * 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 */ |
