Add identifier for the network device into the DHCP request.

diff --git a/src/include/gpxe/dhcp.h b/src/include/gpxe/dhcp.h
index a7cac22..8632278 100644 (file)
--- a/src/include/gpxe/dhcp.h
+++ b/src/include/gpxe/dhcp.h
@@ -168,6 +168,19 @@ struct job_interface;
  */
 #define DHCP_EB_SIADDR DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 3 )
 
+/** Network device descriptor
+ *
+ * Byte 0 is the bus type ID; remaining bytes depend on the bus type.
+ *
+ * PCI devices:
+ * Byte 0 : 1 (PCI)
+ * Byte 1 : PCI vendor ID MSB
+ * Byte 2 : PCI vendor ID LSB
+ * Byte 3 : PCI device ID MSB
+ * Byte 4 : PCI device ID LSB
+ */
+#define DHCP_EB_BUS_ID DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xb1 )
+
 /** BIOS drive number
  *
  * This is the drive number for a drive emulated via INT 13.  0x80 is

diff --git a/src/net/udp/dhcp.c b/src/net/udp/dhcp.c
index b82db1a..f8f59e2 100644 (file)
--- a/src/net/udp/dhcp.c
+++ b/src/net/udp/dhcp.c
@@ -24,6 +24,7 @@
 #include <byteswap.h>
 #include <gpxe/if_ether.h>
 #include <gpxe/netdevice.h>
+#include <gpxe/device.h>
 #include <gpxe/xfer.h>
 #include <gpxe/open.h>
 #include <gpxe/job.h>
@@ -480,6 +481,16 @@ static struct dhcp_option_block * dhcp_parse ( const struct dhcphdr *dhcphdr,
  *
  */
 
+/** DHCP network device descriptor */
+struct dhcp_netdev_desc {
+       /** Bus type ID */
+       uint8_t type;
+       /** Vendor ID */
+       uint16_t vendor;
+       /** Device ID */
+       uint16_t device;
+} __attribute__ (( packed ));
+
 /**
  * Create DHCP request
  *
@@ -495,6 +506,8 @@ int create_dhcp_request ( struct net_device *netdev, int msgtype,
                          struct dhcp_option_block *options,
                          void *data, size_t max_len,
                          struct dhcp_packet *dhcppkt ) {
+       struct device_description *desc = &netdev->dev->desc;
+       struct dhcp_netdev_desc dhcp_desc;
        int rc;
 
        /* Create DHCP packet */
@@ -531,6 +544,18 @@ int create_dhcp_request ( struct net_device *netdev, int msgtype,
                }
        }
 
+       /* Add options to identify the network device */
+       dhcp_desc.type = desc->bus_type;
+       dhcp_desc.vendor = htons ( desc->vendor );
+       dhcp_desc.device = htons ( desc->device );
+       if ( ( rc = set_dhcp_packet_option ( dhcppkt, DHCP_EB_BUS_ID,
+                                            &dhcp_desc,
+                                            sizeof ( dhcp_desc ) ) ) != 0 ) {
+               DBG ( "DHCP could not set bus ID option: %s\n",
+                     strerror ( rc ) );
+               return rc;
+       }
+
        return 0;
 }