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

[Patrick Wildt]

On Thu, Jan 31, 2019 at 07:29:04PM +0100, Heinrich Schuchardt wrote:
> Do we really need multiple functions to update the DHCP status?
> 
> I would prefer a single function with a parameter telling which DHCP
> status has been reached.
> 

I think this diff below might be better.  There we have an update
function that is called after it switch the state, and on REQUESTING
we save the packet information and on BOUND we received the ack.

> 
> The current network device can be determined via eth_get_dev().
> In function eth_current_changed() this eth_get_dev() function is used to
> update the ethact environment variable.
> 
> If we have a single update function we can determine the active network
> device there.

The efi network object is only created on bootefi, so there is no DHCP
going on at that point.  It all happens some time before bootefi is
called.  The only thing that we could do is try to memorize for which
ethernet we received the DHCP packets, and when we create the EFI
network object we can try to see if the DHCP packets match to the
current ethernet we create the object for.

Patrick

diff --git a/include/efi_loader.h b/include/efi_loader.h
index 00b81c6010..7e8f3b04b5 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -290,8 +290,8 @@ efi_status_t efi_smbios_register(void);
 struct efi_simple_file_system_protocol *
 efi_fs_from_path(struct efi_device_path *fp);
 
-/* Called by networking code to memorize the dhcp ack package */
-void efi_net_set_dhcp_ack(void *pkt, int len);
+/* Called by networking code to memorize dhcp information */
+void efi_net_update_dhcp(int state, void *pkt, int len);
 /* Called by efi_set_watchdog_timer to reset the timer */
 efi_status_t efi_set_watchdog(unsigned long timeout);
 
@@ -578,7 +578,7 @@ static inline efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
 static inline void efi_restore_gd(void) { }
 static inline void efi_set_bootdev(const char *dev, const char *devnr,
 				   const char *path) { }
-static inline void efi_net_set_dhcp_ack(void *pkt, int len) { }
+static inline void efi_net_update_dhcp(int state, void *pkt, int len) {}
 static inline void efi_print_image_infos(void *pc) { }
 
 #endif /* CONFIG_IS_ENABLED(EFI_LOADER) */
diff --git a/lib/efi_loader/efi_net.c b/lib/efi_loader/efi_net.c
index c7d9da8521..92e13a7c13 100644
--- a/lib/efi_loader/efi_net.c
+++ b/lib/efi_loader/efi_net.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <efi_loader.h>
 #include <malloc.h>
+#include "../net/bootp.h"
 
 static const efi_guid_t efi_net_guid = EFI_SIMPLE_NETWORK_GUID;
 static const efi_guid_t efi_pxe_guid = EFI_PXE_GUID;
@@ -15,6 +16,7 @@ static struct efi_pxe_packet *dhcp_ack;
 static bool new_rx_packet;
 static void *new_tx_packet;
 static void *transmit_buffer;
+static int dhcp_ack_received;
 
 /*
  * The notification function of this event is called in every timer cycle
@@ -522,18 +524,22 @@ out:
 }
 
 /**
- * efi_net_set_dhcp_ack() - take note of a selected DHCP IP address
+ * efi_net_update_dhcp() - take note of DHCP information
  *
  * This function is called by dhcp_handler().
  */
-void efi_net_set_dhcp_ack(void *pkt, int len)
+void efi_net_update_dhcp(int state, void *pkt, int len)
 {
 	int maxsize = sizeof(*dhcp_ack);
 
 	if (!dhcp_ack)
 		dhcp_ack = malloc(maxsize);
 
-	memcpy(dhcp_ack, pkt, min(len, maxsize));
+	if (state == REQUESTING)
+		memcpy(dhcp_ack, pkt, min(len, maxsize));
+
+	if (state == BOUND)
+		dhcp_ack_received = 1;
 }
 
 /**
@@ -645,8 +651,10 @@ efi_status_t efi_net_register(void)
 	netobj->net_mode.if_type = ARP_ETHER;
 
 	netobj->pxe.mode = &netobj->pxe_mode;
-	if (dhcp_ack)
+	if (dhcp_ack) {
 		netobj->pxe_mode.dhcp_ack = *dhcp_ack;
+		netobj->pxe_mode.dhcp_ack_received = dhcp_ack_received;
+	}
 
 	/*
 	 * Create WaitForPacket event.
diff --git a/net/bootp.c b/net/bootp.c
index 9a2b512e4a..987fc47d06 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -1067,11 +1067,11 @@ static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 			    strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
 #endif	/* CONFIG_SYS_BOOTFILE_PREFIX */
 			dhcp_packet_process_options(bp);
-			efi_net_set_dhcp_ack(pkt, len);
 
 			debug("TRANSITIONING TO REQUESTING STATE\n");
 			dhcp_state = REQUESTING;
 
+			efi_net_update_dhcp(dhcp_state, pkt, len);
 			net_set_timeout_handler(5000, bootp_timeout_handler);
 			dhcp_send_request_packet(bp);
 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
@@ -1090,6 +1090,7 @@ static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 			dhcp_state = BOUND;
 			printf("DHCP client bound to address %pI4 (%lu ms)\n",
 			       &net_ip, get_timer(bootp_start));
+			efi_net_update_dhcp(dhcp_state, pkt, len);
 			net_set_timeout_handler(0, (thand_f *)0);
 			bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
 					    "bootp_stop");