mi: Additional define options for older systems with SIOCMCTPALLOC

Older systems (WSL for example) may not include SIOCMCTPALLOC defines
and structs and when enabling in MCTP code will cause build errors.
This is a workaround.

Signed-off-by: Chuck Horkin <[email protected]>

Author: chorkin

src/nvme/mi-mctp.c

@@ -76,6 +76,35 @@ struct sockaddr_mctp {
 
 #endif /* !AF_MCTP */
 
+#if !defined(MCTP_TAG_PREALLOC)
+/*Adding this here for users with older build MCTP header
+ *that require SIOCMCTPALLOC/DROP
+ */
+#define MCTP_TAG_PREALLOC	0x10
+
+#define SIOCMCTPALLOCTAG	(SIOCPROTOPRIVATE + 0)
+#define SIOCMCTPDROPTAG		(SIOCPROTOPRIVATE + 1)
+
+/* Deprecated: use mctp_ioc_tag_ctl2 / TAG2 ioctls instead, which defines the
+ * MCTP network ID as part of the allocated tag. Using this assumes the default
+ * net ID for allocated tags, which may not give correct behaviour on system
+ * with multiple networks configured.
+ */
+struct mctp_ioc_tag_ctl {
+	mctp_eid_t	peer_addr;
+
+	/* For SIOCMCTPALLOCTAG: must be passed as zero, kernel will
+	 * populate with the allocated tag value. Returned tag value will
+	 * always have TO and PREALLOC set.
+	 *
+	 * For SIOCMCTPDROPTAG: userspace provides tag value to drop, from
+	 * a prior SIOCMCTPALLOCTAG call (and so must have TO and PREALLOC set).
+	 */
+	__u8		tag;
+	__u16		flags;
+};
+#endif  /* !MCTP_TAG_PREALLOC */
+
 #define MCTP_TYPE_NVME		0x04
 #define MCTP_TYPE_MIC		0x80