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[ecm] Treat ACPI MAC address as being a non-permanent MAC address

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When applying an ACPI-provided system-specific MAC address, apply it
to netdev->ll_addr rather than netdev->hw_addr.  This allows iPXE
scripts to access the permanent MAC address via the ${netX/hwaddr}
setting (and thereby provides scripts with a mechanism to ascertain
that the NIC is using a MAC address other than its own permanent
hardware address).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2022-05-23 12:23:53 +01:00
parent 70995397e5
commit 87f1796f15
3 changed files with 18 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
src/drivers/net/ecm.c
View File

@@ -84,24 +84,18 @@ ecm_ethernet_descriptor ( struct usb_configuration_descriptor *config,
* *
* @v func USB function * @v func USB function
* @v desc Ethernet functional descriptor * @v desc Ethernet functional descriptor
* @v hw_addr Hardware address to fill in * @v netdev Network device
* @ret rc Return status code * @ret rc Return status code
*/ */
int ecm_fetch_mac ( struct usb_function *func, int ecm_fetch_mac ( struct usb_function *func,
struct ecm_ethernet_descriptor *desc, uint8_t *hw_addr ) { struct ecm_ethernet_descriptor *desc,
struct net_device *netdev ) {
struct usb_device *usb = func->usb; struct usb_device *usb = func->usb;
char buf[ base16_encoded_len ( ETH_ALEN ) + 1 /* NUL */ ]; char buf[ base16_encoded_len ( ETH_ALEN ) + 1 /* NUL */ ];
uint8_t amac[ETH_ALEN];
int len; int len;
int rc; int rc;
/* Use system-specific MAC address, if present and not already used */
if ( ( ( rc = acpi_mac ( hw_addr ) ) == 0 ) &&
! find_netdev_by_ll_addr ( &ethernet_protocol, hw_addr ) ) {
DBGC ( usb, "USB %s using system-specific MAC %s\n",
func->name, eth_ntoa ( hw_addr ) );
return 0;
}
/* Fetch MAC address string */ /* Fetch MAC address string */
len = usb_get_string_descriptor ( usb, desc->mac, 0, buf, len = usb_get_string_descriptor ( usb, desc->mac, 0, buf,
sizeof ( buf ) ); sizeof ( buf ) );
@@ -118,7 +112,7 @@ int ecm_fetch_mac ( struct usb_function *func,
} }
/* Decode MAC address */ /* Decode MAC address */
len = base16_decode ( buf, hw_addr, ETH_ALEN ); len = base16_decode ( buf, netdev->hw_addr, ETH_ALEN );
if ( len < 0 ) { if ( len < 0 ) {
rc = len; rc = len;
DBGC ( usb, "USB %s could not decode ECM MAC \"%s\": %s\n", DBGC ( usb, "USB %s could not decode ECM MAC \"%s\": %s\n",
@@ -126,6 +120,16 @@ int ecm_fetch_mac ( struct usb_function *func,
return rc; return rc;
} }
/* Apply system-specific MAC address as current link-layer
* address, if present and not already used.
*/
if ( ( ( rc = acpi_mac ( amac ) ) == 0 ) &&
! find_netdev_by_ll_addr ( &ethernet_protocol, amac ) ) {
memcpy ( netdev->ll_addr, amac, ETH_ALEN );
DBGC ( usb, "USB %s using system-specific MAC %s\n",
func->name, eth_ntoa ( netdev->ll_addr ) );
}
return 0; return 0;
} }
@@ -474,7 +478,7 @@ static int ecm_probe ( struct usb_function *func,
} }
/* Fetch MAC address */ /* Fetch MAC address */
if ( ( rc = ecm_fetch_mac ( func, ethernet, netdev->hw_addr ) ) != 0 ) { if ( ( rc = ecm_fetch_mac ( func, ethernet, netdev ) ) != 0 ) {
DBGC ( ecm, "ECM %p could not fetch MAC address: %s\n", DBGC ( ecm, "ECM %p could not fetch MAC address: %s\n",
ecm, strerror ( rc ) ); ecm, strerror ( rc ) );
goto err_fetch_mac; goto err_fetch_mac;

2
src/drivers/net/ecm.h
View File

@@ -88,6 +88,6 @@ ecm_ethernet_descriptor ( struct usb_configuration_descriptor *config,
struct usb_interface_descriptor *interface ); struct usb_interface_descriptor *interface );
extern int ecm_fetch_mac ( struct usb_function *func, extern int ecm_fetch_mac ( struct usb_function *func,
struct ecm_ethernet_descriptor *desc, struct ecm_ethernet_descriptor *desc,
uint8_t *hw_addr ); struct net_device *netdev );
#endif /* _ECM_H */ #endif /* _ECM_H */

2
src/drivers/net/ncm.c
View File

@@ -598,7 +598,7 @@ static int ncm_probe ( struct usb_function *func,
} }
/* Fetch MAC address */ /* Fetch MAC address */
if ( ( rc = ecm_fetch_mac ( func, ethernet, netdev->hw_addr ) ) != 0 ) { if ( ( rc = ecm_fetch_mac ( func, ethernet, netdev ) ) != 0 ) {
DBGC ( ncm, "NCM %p could not fetch MAC address: %s\n", DBGC ( ncm, "NCM %p could not fetch MAC address: %s\n",
ncm, strerror ( rc ) ); ncm, strerror ( rc ) );
goto err_fetch_mac; goto err_fetch_mac;