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| author | Lyle Franklin <lylejfranklin@gmail.com> | 2019-08-05 06:23:42 -0400 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2020-12-01 10:33:37 -0500 |
| commit | c8e251f82af97562741e51110ed8828a5c5744c6 (patch) | |
| tree | f4c4cc6fce067d4aeb070896d72eb71901e7751d /net/Kconfig | |
| parent | db3667413d99b8ec1b1e7e9b34c20a8883ec413d (diff) | |
| download | u-boot-c8e251f82af97562741e51110ed8828a5c5744c6.tar.gz u-boot-c8e251f82af97562741e51110ed8828a5c5744c6.tar.xz u-boot-c8e251f82af97562741e51110ed8828a5c5744c6.zip | |
Adds basic support for ProxyDHCP
- ProxyDHCP allows a second DHCP server to exist alongside your main
DHCP server and supply additional BOOTP related options
- When u-boot sends out a DHCP request, the real DHCP server will
respond with a normal response containing the new client IP address
while simultaneously the ProxyDHCP server will respond with a blank
client IP address and a `bootfile` option
- This patch adds CONFIG_SERVERIP_FROM_PROXYDHCP (default false) to
enable this behavior and CONFIG_SERVERIP_FROM_PROXYDHCP_DELAY_MS
(default 100) which tells u-boot to wait additional time after
receiving the main DHCP response to give the ProxyDHCP response time
to arrive
- The PXE spec for ProxyDHCP is more complicated than the solution
added here as diagramed on page 16:
http://www.pix.net/software/pxeboot/archive/pxespec.pdf:
```
DHCP Discover will be retried four times. The four timeouts are 4, 8, 16
and 32 seconds respectively. If a DHCPOFFER is received without an Option
timeouts in an attempt to receive a PXE response.
```
- Adding a simple delay worked for my purposes but let me know if a
more robust solution is required
Signed-off-by: Lyle Franklin <lylejfranklin@gmail.com>
Diffstat (limited to 'net/Kconfig')
| -rw-r--r-- | net/Kconfig | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/net/Kconfig b/net/Kconfig index 1b3e420d0d..c4b4dae064 100644 --- a/net/Kconfig +++ b/net/Kconfig @@ -74,4 +74,18 @@ config TFTP_WINDOWSIZE before an ack response is required. The default TFTP implementation implies a window size of 1. +config SERVERIP_FROM_PROXYDHCP + bool "Get serverip value from Proxy DHCP response" + help + Allows bootfile config to be fetched from Proxy DHCP server + while IP is obtained from main DHCP server. + +config SERVERIP_FROM_PROXYDHCP_DELAY_MS + int "# of additional milliseconds to wait for ProxyDHCP response" + default 100 + help + Amount of additional time to wait for ProxyDHCP response after + receiving response from main DHCP server. Has no effect if + SERVERIP_FROM_PROXYDHCP is false. + endif # if NET |