[settings] Add Bus ID setting

Users can find the bus type and PCI IDs for a network interface with:

netX/busid

Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/net/netdev_settings.c b/src/net/netdev_settings.c
index b9220f5e..d814193b 100644
--- a/src/net/netdev_settings.c
+++ b/src/net/netdev_settings.c
@@ -20,8 +20,10 @@ FILE_LICENCE ( GPL2_OR_LATER );
 
 #include <string.h>
 #include <errno.h>
+#include <byteswap.h>
 #include <gpxe/dhcp.h>
 #include <gpxe/settings.h>
+#include <gpxe/device.h>
 #include <gpxe/netdevice.h>
 
 /** @file
@@ -36,6 +38,11 @@ struct setting mac_setting __setting = {
 	.description = "MAC address",
 	.type = &setting_type_hex,
 };
+struct setting busid_setting __setting = {
+	.name = "busid",
+	.description = "Bus ID",
+	.type = &setting_type_hex,
+};
 
 /**
  * Store value of network device setting
@@ -74,6 +81,8 @@ static int netdev_fetch ( struct settings *settings, struct setting *setting,
 			  void *data, size_t len ) {
 	struct net_device *netdev = container_of ( settings, struct net_device,
 						   settings.settings );
+	struct device_description *desc = &netdev->dev->desc;
+	struct dhcp_netdev_desc dhcp_desc;
 
 	if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
 		if ( len > netdev->ll_protocol->ll_addr_len )
@@ -81,6 +90,15 @@ static int netdev_fetch ( struct settings *settings, struct setting *setting,
 		memcpy ( data, netdev->ll_addr, len );
 		return netdev->ll_protocol->ll_addr_len;
 	}
+	if ( setting_cmp ( setting, &busid_setting ) == 0 ) {
+		dhcp_desc.type = desc->bus_type;
+		dhcp_desc.vendor = htons ( desc->vendor );
+		dhcp_desc.device = htons ( desc->device );
+		if ( len > sizeof ( dhcp_desc ) )
+			len = sizeof ( dhcp_desc );
+		memcpy ( data, &dhcp_desc, len );
+		return sizeof ( dhcp_desc );
+	}
 
 	return generic_settings_fetch ( settings, setting, data, len );
 }