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[iscsi] Allow iSCSI device to be described using an EFI device path

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2020-10-20 14:48:29 +01:00
parent 334f0074b1
commit e6f9054d13
3 changed files with 75 additions and 0 deletions
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70
src/interface/efi/efi_path.c
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@@ -23,7 +23,9 @@
#include <byteswap.h>
#include <ipxe/netdevice.h>
#include <ipxe/vlan.h>
#include <ipxe/tcpip.h>
#include <ipxe/uri.h>
#include <ipxe/iscsi.h>
#include <ipxe/aoe.h>
#include <ipxe/usb.h>
#include <ipxe/efi/efi.h>
@@ -221,6 +223,74 @@ EFI_DEVICE_PATH_PROTOCOL * efi_uri_path ( struct uri *uri ) {
return path;
}
/**
* Construct EFI device path for iSCSI device
*
* @v iscsi iSCSI session
* @ret path EFI device path, or NULL on error
*/
EFI_DEVICE_PATH_PROTOCOL * efi_iscsi_path ( struct iscsi_session *iscsi ) {
struct sockaddr_tcpip *st_target;
struct net_device *netdev;
EFI_DEVICE_PATH_PROTOCOL *netpath;
EFI_DEVICE_PATH_PROTOCOL *path;
EFI_DEVICE_PATH_PROTOCOL *end;
ISCSI_DEVICE_PATH *iscsipath;
char *name;
size_t prefix_len;
size_t name_len;
size_t iscsi_len;
size_t len;
/* Get network device associated with target address */
st_target = ( ( struct sockaddr_tcpip * ) &iscsi->target_sockaddr );
netdev = tcpip_netdev ( st_target );
if ( ! netdev )
goto err_netdev;
/* Get network device path */
netpath = efi_netdev_path ( netdev );
if ( ! netpath )
goto err_netpath;
/* Calculate device path length */
prefix_len = efi_path_len ( netpath );
name_len = ( strlen ( iscsi->target_iqn ) + 1 /* NUL */ );
iscsi_len = ( sizeof ( *iscsipath ) + name_len );
len = ( prefix_len + iscsi_len + sizeof ( *end ) );
/* Allocate device path */
path = zalloc ( len );
if ( ! path )
goto err_alloc;
/* Construct device path */
memcpy ( path, netpath, prefix_len );
iscsipath = ( ( ( void * ) path ) + prefix_len );
iscsipath->Header.Type = MESSAGING_DEVICE_PATH;
iscsipath->Header.SubType = MSG_ISCSI_DP;
iscsipath->Header.Length[0] = iscsi_len;
iscsipath->LoginOption = ISCSI_LOGIN_OPTION_AUTHMETHOD_NON;
memcpy ( &iscsipath->Lun, &iscsi->lun, sizeof ( iscsipath->Lun ) );
name = ( ( ( void * ) iscsipath ) + sizeof ( *iscsipath ) );
memcpy ( name, iscsi->target_iqn, name_len );
end = ( ( ( void * ) name ) + name_len );
end->Type = END_DEVICE_PATH_TYPE;
end->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
end->Length[0] = sizeof ( *end );
/* Free temporary paths */
free ( netpath );
return path;
err_alloc:
free ( netpath );
err_netpath:
err_netdev:
return NULL;
}
/**
* Construct EFI device path for AoE device
*