[PATCH v8 2/5] spdm: add spdm storage transport virtual header

[Wilfred Mallawa <wilfred.opensource@gmail.com>]

From: Wilfred Mallawa <wilfred.mallawa@wdc.com>

This header contains the transport encoding for an SPDM message that
uses the SPDM over Storage transport as defined by the DMTF DSP0286.

Note that in the StorageSpdmTransportHeader structure, security_protocol
field is defined in the SCSI Primary Commands 5 (SPC-5) specification.
The NVMe specification also refers to the SPC-5 for this definition.
The security_protocol_specific field is defined in DSP0286 and is
referred to as SP Specific for NVMe and ATA.

Signed-off-by: Wilfred Mallawa <wilfred.mallawa@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
---
 include/system/spdm-socket.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/system/spdm-socket.h b/include/system/spdm-socket.h
index 29aa04fd52..8c07dc12d2 100644
--- a/include/system/spdm-socket.h
+++ b/include/system/spdm-socket.h
@@ -88,6 +88,20 @@ bool spdm_socket_send(const int socket, uint32_t socket_cmd,
  */
 void spdm_socket_close(const int socket, uint32_t transport_type);
 
+/*
+ * Defines the transport encoding for SPDM, this information shall be passed
+ * down to the SPDM server, when conforming to the SPDM over Storage standard
+ * as defined by DSP0286.
+ */
+typedef struct {
+    uint8_t security_protocol;              /* Must be 0xE8 for SPDM Commands
+                                               as per SCSI Primary Commands 5 */
+    uint16_t security_protocol_specific;    /* Bit[7:2] SPDM Operation
+                                               Bit[0:1] Connection ID
+                                               per DSP0286 1.0: Section 7.2 */
+    uint32_t length;                        /* Length of the SPDM Message*/
+} QEMU_PACKED StorageSpdmTransportHeader;
+
 #define SPDM_SOCKET_COMMAND_NORMAL                0x0001
 #define SPDM_SOCKET_STORAGE_CMD_IF_SEND           0x0002
 #define SPDM_SOCKET_STORAGE_CMD_IF_RECV           0x0003
-- 
2.51.0