From a464cc3c0439bec4055fe48d22c3af3d640935b1 Mon Sep 17 00:00:00 2001
From: Jacob Weinstock <jakobweinstock@gmail.com>
Date: Fri, 26 Jul 2024 16:41:16 -0600
Subject: [PATCH] Add dhcp retries to embedded iPXE script:

This resolves issues when an interface
might need some time before the upstream
port is forwarding properly or if the firmware
is slow, etc. I found this to make a Raspberry PI 4b
boot consistently. This was also tested and resolved
consistency issues with Cisco ACI switches using
LACP configured interfaces.

Signed-off-by: Jacob Weinstock <jakobweinstock@gmail.com>
---
 binary/script/embed.ipxe | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/binary/script/embed.ipxe b/binary/script/embed.ipxe
index b2c582b..e84d618 100644
--- a/binary/script/embed.ipxe
+++ b/binary/script/embed.ipxe
@@ -22,10 +22,22 @@ isset ${net${idx}/ip} && goto interfaces-loop-done || iseq ${idx} 50 && goto aut
 
 :interfaces-loop-done
 echo Booting from net${idx}...
-autoboot net${idx}
+set retry-max:int32 10
+set count:int32 1
+:retry-loop1
+echo trying dhcp ( attempt ${count}/${retry-max} )
+dhcp net${idx} && goto done1 || iseq ${count} ${retry-max} || inc count && goto retry-loop1
+:done1
+autoboot net${idx} || exit
 
 :autoboot
-autoboot
+set retry-max:int32 10
+set count:int32 1
+:retry-loop2
+echo trying dhcp ( attempt ${count}/${retry-max} )
+dhcp && goto done2 || iseq ${count} ${retry-max} || inc count && goto retry-loop2
+:done2
+autoboot || exit
 
 :boot-with-vlan
 set idx:int32 0