Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: 11f1d28bcb8553af9c689ec121c191a258e6f01a
https://github.com/tianocore/edk2/commit/11f1d28bcb8553af9c689ec121c191a258e6f01a
Author: Sam Tsai <[email protected]>
Date: 2025-05-29 (Thu, 29 May 2025)
Changed paths:
M NetworkPkg/HttpBootDxe/HttpBootDhcp6.c
M NetworkPkg/HttpBootDxe/HttpBootDhcp6.h
Log Message:
-----------
NetworkPkg/HttpBootDxe: Wait for IPv6 DAD before issuing DHCPv6 requests
Align HTTP Boot behavior with PXE by inserting a delay to wait for IPv6
Duplicate Address Detection (DAD) to complete before issuing DHCPv6 requests.
This avoids EFI_NO_MAPPING errors caused by early DHCP attempts before a valid
IPv6 address is ready.
Problem:
On some platforms, HTTP boot over IPv6 fails with EFI_NO_MAPPING during initial
DHCPv6 attempts. The failure is due to the system trying to send Solicit
messages before IPv6 DAD finishes, resulting in no usable IP address at that
time.
Solution:
Insert a retry mechanism to poll DAD completion when the initial call to
Dhcp6->Start() fails with EFI_NO_MAPPING. This behavior mirrors PXE's handling,
where it waits for a valid IPv6 address to be assigned before retrying the
DHCPv6 flow.
Signed-off-by: Sam Tsai [Wiwynn] <[email protected]>
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