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[infiniband] Allow SRP device to be described using an EFI device path

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The UEFI specification provides a partial definition of an Infiniband
device path structure.  Use this structure to construct what may be a
plausible path containing at least some of the information required to
identify an SRP target device.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2020-10-23 15:26:30 +01:00
parent bf051a76ee
commit a2e44077cd
4 changed files with 95 additions and 33 deletions
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55
src/interface/efi/efi_path.c
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@@ -28,6 +28,7 @@
#include <ipxe/iscsi.h>
#include <ipxe/aoe.h>
#include <ipxe/fcp.h>
#include <ipxe/ib_srp.h>
#include <ipxe/usb.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_driver.h>
@@ -368,6 +369,60 @@ EFI_DEVICE_PATH_PROTOCOL * efi_fcp_path ( struct fcp_description *desc ) {
return &path->fc.Header;
}
/**
* Construct EFI device path for Infiniband SRP device
*
* @v ib_srp Infiniband SRP device
* @ret path EFI device path, or NULL on error
*/
EFI_DEVICE_PATH_PROTOCOL * efi_ib_srp_path ( struct ib_srp_device *ib_srp ) {
const struct ipxe_ib_sbft *sbft = &ib_srp->sbft;
union ib_srp_target_port_id *id =
container_of ( &sbft->srp.target, union ib_srp_target_port_id,
srp );
struct efi_device *efidev;
EFI_DEVICE_PATH_PROTOCOL *path;
INFINIBAND_DEVICE_PATH *ibpath;
EFI_DEVICE_PATH_PROTOCOL *end;
size_t prefix_len;
size_t len;
/* Find parent EFI device */
efidev = efidev_parent ( ib_srp->ibdev->dev );
if ( ! efidev )
return NULL;
/* Calculate device path length */
prefix_len = efi_path_len ( efidev->path );
len = ( prefix_len + sizeof ( *ibpath ) + sizeof ( *end ) );
/* Allocate device path */
path = zalloc ( len );
if ( ! path )
return NULL;
/* Construct device path */
memcpy ( path, efidev->path, prefix_len );
ibpath = ( ( ( void * ) path ) + prefix_len );
ibpath->Header.Type = MESSAGING_DEVICE_PATH;
ibpath->Header.SubType = MSG_INFINIBAND_DP;
ibpath->Header.Length[0] = sizeof ( *ibpath );
ibpath->ResourceFlags = INFINIBAND_RESOURCE_FLAG_STORAGE_PROTOCOL;
memcpy ( ibpath->PortGid, &sbft->ib.dgid, sizeof ( ibpath->PortGid ) );
memcpy ( &ibpath->ServiceId, &sbft->ib.service_id,
sizeof ( ibpath->ServiceId ) );
memcpy ( &ibpath->TargetPortId, &id->ib.ioc_guid,
sizeof ( ibpath->TargetPortId ) );
memcpy ( &ibpath->DeviceId, &id->ib.id_ext,
sizeof ( ibpath->DeviceId ) );
end = ( ( ( void * ) ibpath ) + sizeof ( *ibpath ) );
end->Type = END_DEVICE_PATH_TYPE;
end->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
end->Length[0] = sizeof ( *end );
return path;
}
/**
* Construct EFI device path for USB function
*