commit ea7646be892feca8a34a8f4197768df982ef8e13
author Michael Brown <mcb30@ipxe.org> Fri Jul 23 11:32:04 2021 +0100
committer Michael Brown <mcb30@ipxe.org> Fri Jul 23 11:32:04 2021 +0100
tree f946e3578a93f63763da196568b1f575060e4329
parent 4d180be5175e176ec27680557c1d67536a847610

[efi] Record cached ProxyDHCPOFFER and PXEBSACK, if present

Commit cd3de55 ("[efi] Record cached DHCPACK from loaded image's
device handle, if present") added the ability for a chainloaded UEFI
iPXE to reuse an IPv4 address and DHCP options previously obtained by
a built-in PXE stack, without needing to perform a second DHCP
request.

Extend this to also record the cached ProxyDHCPOFFER and PXEBSACK
obtained from the EFI_PXE_BASE_CODE_PROTOCOL instance installed on the
loaded image's device handle, if present.

This allows a chainloaded UEFI iPXE to reuse a boot filename or other
options that were provided via a ProxyDHCP or PXE boot server
mechanism, rather than by standard DHCP.

Signed-off-by: Michael Brown <mcb30@ipxe.org>