[U-Boot] [PATCH 2/2] efi_loader: set the dhcp ack received flag

[Patrick Wildt <patrick@blueri.se>]

On Sun, Mar 25, 2018 at 10:04:55PM +0200, Heinrich Schuchardt wrote:
> Thank you for the explanation. I think the right way go ahead is to add
> all missing fields and to do away with unused[].
> 
> Please, carefully observe the alignment. The spec defines BOOLEAN as
> 8bit value. ToS is the 19th byte followed by an EFI_IP_ADDRESS which is
> a 16-byte buffer aligned on a 4-byte boundary. So after ToS we need one
> byte to ensure alignment. We could define a struct efi_ip_address as
> u8 a[16] __attribute__((aligned(4))).
> 
> Best regards
> 
> Heinrich

I have noticed that, yes.  I think explicitly padding the struct gives
better visibility of the issue, instead of relying on an implicit
alignment.  Two other structures in u-boot EFI headers contain explicit
"pad" members.  I'd feel safer to go that route.  What do you think
about the following?

Best regards,
Patrick

diff --git a/include/efi_api.h b/include/efi_api.h
index 3ba650e57e..489ff476a4 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -756,7 +756,28 @@ struct efi_pxe_packet {
 
 struct efi_pxe_mode
 {
-	u8 unused[52];
+	u8 started;
+	u8 ipv6_available;
+	u8 ipv6_supported;
+	u8 using_ipv6;
+	u8 bis_supported;
+	u8 bis_detected;
+	u8 auto_arp;
+	u8 send_guid;
+	u8 dhcp_discover_valid;
+	u8 dhcp_ack_received;
+	u8 proxy_offer_received;
+	u8 pxe_discovervalid;
+	u8 pxe_reply_received;
+	u8 pxe_bis_reply_received;
+	u8 icmp_error_received;
+	u8 tftp_error_received;
+	u8 make_callbacks;
+	u8 ttl;
+	u8 tos;
+	u8 pad;
+	struct efi_ip_address station_ip;
+	struct efi_ip_address subnet_mask;
 	struct efi_pxe_packet dhcp_discover;
 	struct efi_pxe_packet dhcp_ack;
 	struct efi_pxe_packet proxy_offer;