[PATCH v4 08/14] efi_loader: net: set EFI bootdevice device path to HTTP when loaded from wget

[Adriano Cordova]

Set the device path of the efi boot device to an HTTP device path
(as formed by efi_dp_from_http) when the next boot stage is loaded
using wget (i.e., when wget is used with wget_info.set_bootdev=1).

When loaded from HTTP, the device path should account for it so that
the next boot stage is aware (e.g. grub only loads its http stack if
it itself was loaded from http, and it checks this from its device path).

Signed-off-by: Adriano Cordova <adrianox at gmail.com>
---

(no changes since v2)

 include/efi_loader.h             |  6 +++++
 lib/efi_loader/efi_device_path.c |  2 +-
 lib/efi_loader/efi_net.c         | 38 +++++++++++++++++++++++++++++++-
 net/lwip/wget.c                  |  1 +
 net/wget.c                       |  1 +
 5 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/include/efi_loader.h b/include/efi_loader.h
index 96b204dfc3..f49f8e6be0 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -126,6 +126,10 @@ static inline void efi_set_bootdev(const char *dev, const char *devnr,
 #endif
 
 #if CONFIG_IS_ENABLED(NETDEVICES) && CONFIG_IS_ENABLED(EFI_LOADER)
+/* Call this to update the current device path of the efi net device */
+void efi_net_set_dp(const char *dev, const char *server);
+/* Call this to get the current device path of the efi net device */
+void efi_net_get_dp(void **dp);
 void efi_net_get_addr(struct efi_ipv4_address *ip,
 		      struct efi_ipv4_address *mask,
 		      struct efi_ipv4_address *gw);
@@ -133,6 +137,8 @@ void efi_net_set_addr(struct efi_ipv4_address *ip,
 		      struct efi_ipv4_address *mask,
 		      struct efi_ipv4_address *gw);
 #else
+static inline void efi_net_set_dp(const char *dev, const char *server) { }
+static inline void efi_net_get_dp(void **dp) { }
 static inline void efi_net_get_addr(struct efi_ipv4_address *ip,
 				     struct efi_ipv4_address *mask,
 				     struct efi_ipv4_address *gw) { }
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 9ee03062ac..5fae3fbb5a 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -1165,7 +1165,7 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
 		dp = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 				     (uintptr_t)image_addr, image_size);
 	} else if (IS_ENABLED(CONFIG_NETDEVICES) && !strcmp(dev, "Net")) {
-		dp = efi_dp_from_eth();
+		efi_net_get_dp((void **)&dp);
 	} else if (!strcmp(dev, "Uart")) {
 		dp = efi_dp_from_uart();
 	} else {
diff --git a/lib/efi_loader/efi_net.c b/lib/efi_loader/efi_net.c
index 3f0b571cc6..2207caf6fe 100644
--- a/lib/efi_loader/efi_net.c
+++ b/lib/efi_loader/efi_net.c
@@ -16,6 +16,7 @@
  */
 
 #include <efi_loader.h>
+#include <dm.h>
 #include <malloc.h>
 #include <vsprintf.h>
 #include <net.h>
@@ -31,6 +32,7 @@ static size_t *receive_lengths;
 static int rx_packet_idx;
 static int rx_packet_num;
 static struct efi_net_obj *netobj;
+static struct efi_device_path *net_dp;
 
 /*
  * The notification function of this event is called in every timer cycle
@@ -902,8 +904,10 @@ efi_status_t efi_net_register(void)
 			     &netobj->net);
 	if (r != EFI_SUCCESS)
 		goto failure_to_add_protocol;
+	if (!net_dp)
+		efi_net_set_dp("Net", NULL);
 	r = efi_add_protocol(&netobj->header, &efi_guid_device_path,
-			     efi_dp_from_eth());
+			     net_dp);
 	if (r != EFI_SUCCESS)
 		goto failure_to_add_protocol;
 	r = efi_add_protocol(&netobj->header, &efi_pxe_base_code_protocol_guid,
@@ -999,6 +1003,38 @@ out_of_resources:
 	return EFI_OUT_OF_RESOURCES;
 }
 
+/**
+ * efi_net_set_dp() - set device path of efi net device
+ *
+ * This gets called to update the device path when a new boot
+ * file is dowloaded
+ *
+ * @dev:	dev to set the device path from
+ * @server:	remote server address
+ */
+void efi_net_set_dp(const char *dev, const char *server)
+{
+	if (!strcmp(dev, "Net"))
+		net_dp = efi_dp_from_eth();
+	else if (!strcmp(dev, "Http"))
+		net_dp = efi_dp_from_http(server);
+}
+
+/**
+ * efi_net_get_dp() - get device path of efi net device
+ *
+ * Produce a copy of the current device path
+ *
+ * @dp:		copy of the current device path
+ */
+void efi_net_get_dp(void **dp)
+{
+	if (!net_dp)
+		efi_net_set_dp("Net", NULL);
+	if (dp && net_dp)
+		*dp = efi_dp_dup(net_dp);
+}
+
 /**
  * efi_net_get_addr() - get IP address information
  *
diff --git a/net/lwip/wget.c b/net/lwip/wget.c
index 53c3b169e0..5c44e324be 100644
--- a/net/lwip/wget.c
+++ b/net/lwip/wget.c
@@ -217,6 +217,7 @@ static void httpc_result_cb(void *arg, httpc_result_t httpc_result,
 	print_size(rx_content_len / elapsed * 1000, "/s)\n");
 	printf("Bytes transferred = %lu (%lx hex)\n", ctx->size, ctx->size);
 	if (wget_info->set_bootdev) {
+		efi_net_set_dp("Http", ctx->server_name);
 		efi_set_bootdev("Net", "", ctx->path, map_sysmem(ctx->saved_daddr, 0),
 				rx_content_len);
 	}
diff --git a/net/wget.c b/net/wget.c
index 1166aa5aa6..a1328990d2 100644
--- a/net/wget.c
+++ b/net/wget.c
@@ -442,6 +442,7 @@ static void wget_handler(uchar *pkt, u16 dport,
 		net_set_state(wget_loop_state);
 		wget_info->file_size = net_boot_file_size;
 		if (wget_info->method == WGET_HTTP_METHOD_GET && wget_info->set_bootdev) {
+			efi_net_set_dp("Http", NULL);
 			efi_set_bootdev("Net", "", image_url,
 					map_sysmem(image_load_addr, 0),
 					net_boot_file_size);
-- 
2.43.0