[infiniband] Add the concept of a management interface

A management interface is the component through which both local and
remote management agents are accessed.

This new implementation of a management interface allows for the user
to react to timed-out transactions, and also allows for cancellation
of in-progress transactions.

src/include/gpxe/errfile.h

@@ -151,6 +151,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #define ERRFILE_ib_mcast		( ERRFILE_NET | 0x001d0000 )
 #define ERRFILE_ib_cm			( ERRFILE_NET | 0x001e0000 )
 #define ERRFILE_net80211		( ERRFILE_NET | 0x001f0000 )
+#define ERRFILE_ib_mi			( ERRFILE_NET | 0x00200000 )
 
 #define ERRFILE_image		      ( ERRFILE_IMAGE | 0x00000000 )
 #define ERRFILE_elf		      ( ERRFILE_IMAGE | 0x00010000 )

src/include/gpxe/ib_mad.h

@@ -491,7 +491,9 @@ struct ib_mad_hdr {
 #define IB_MGMT_CLASS_CM			0x07
 #define IB_MGMT_CLASS_SNMP			0x08
 #define IB_MGMT_CLASS_VENDOR_RANGE2_START	0x30
-#define IB_MGMT_CLASS_VENDOR_RANGE2_END		0x4F
+#define IB_MGMT_CLASS_VENDOR_RANGE2_END		0x4f
+
+#define IB_MGMT_CLASS_MASK			0x7f
 
 /* Management methods */
 #define IB_MGMT_METHOD_GET			0x01

src/include/gpxe/ib_mi.h

@@ -0,0 +1,135 @@
+#ifndef _GPXE_IB_MI_H
+#define _GPXE_IB_MI_H
+
+/** @file
+ *
+ * Infiniband management interfaces
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <gpxe/list.h>
+#include <gpxe/retry.h>
+#include <gpxe/tables.h>
+#include <gpxe/infiniband.h>
+
+struct ib_mad_interface;
+struct ib_mad_transaction;
+
+/** An Infiniband management agent */
+struct ib_mad_agent {
+	/** Management class */
+	uint8_t mgmt_class;
+	/** Class version */
+	uint8_t class_version;
+	/** Attribute (in network byte order) */
+	uint16_t attr_id;
+	/** Handle MAD
+	 *
+	 * @v ibdev		Infiniband device
+	 * @v mi		Management interface
+	 * @v mad		Received MAD
+	 * @v av		Source address vector
+	 * @ret rc		Return status code
+	 */
+	void ( * handle ) ( struct ib_device *ibdev,
+			    struct ib_mad_interface *mi,
+			    union ib_mad *mad,
+			    struct ib_address_vector *av );
+};
+
+/** Infiniband management agents */
+#define IB_MAD_AGENTS __table ( struct ib_mad_agent, "ib_mad_agents" )
+
+/** Declare an Infiniband management agent */
+#define __ib_mad_agent __table_entry ( IB_MAD_AGENTS, 01 )
+
+/** Infiniband management transaction operations */
+struct ib_mad_transaction_operations {
+	/** Handle transaction completion
+	 *
+	 * @v ibdev		Infiniband device
+	 * @v mi		Management interface
+	 * @v madx		Management transaction
+	 * @v rc		Status code
+	 * @v mad		Received MAD (or NULL on error)
+	 * @v av		Source address vector (or NULL on error)
+	 *
+	 * The completion handler should in most cases call
+	 * ib_destroy_madx() to free up the completed transaction.
+	 */
+	void ( * complete ) ( struct ib_device *ibdev,
+			      struct ib_mad_interface *mi,
+			      struct ib_mad_transaction *madx,
+			      int rc, union ib_mad *mad,
+			      struct ib_address_vector *av );
+};
+
+/** An Infiniband management transaction */
+struct ib_mad_transaction {
+	/** Associated management interface */
+	struct ib_mad_interface *mi;
+	/** List of transactions */
+	struct list_head list;
+	/** Retry timer */
+	struct retry_timer timer;
+	/** Destination address vector */
+	struct ib_address_vector av;
+	/** MAD being sent */
+	union ib_mad mad;
+	/** Transaction operations */
+	struct ib_mad_transaction_operations *op;
+	/** Owner private data */
+	void *owner_priv;
+};
+
+/** An Infiniband management interface */
+struct ib_mad_interface {
+	/** Infiniband device */
+	struct ib_device *ibdev;
+	/** Completion queue */
+	struct ib_completion_queue *cq;
+	/** Queue pair */
+	struct ib_queue_pair *qp;
+	/** List of management transactions */
+	struct list_head madx;
+};
+
+/**
+ * Set Infiniband management transaction owner-private data
+ *
+ * @v madx		Management transaction
+ * @v priv		Private data
+ */
+static inline __always_inline void
+ib_madx_set_ownerdata ( struct ib_mad_transaction *madx, void *priv ) {
+	madx->owner_priv = priv;
+}
+
+/**
+ * Get Infiniband management transaction owner-private data
+ *
+ * @v madx		Management transaction
+ * @ret priv		Private data
+ */
+static inline __always_inline void *
+ib_madx_get_ownerdata ( struct ib_mad_transaction *madx ) {
+	return madx->owner_priv;
+}
+
+extern int ib_mi_send ( struct ib_device *ibdev, struct ib_mad_interface *mi,
+			union ib_mad *mad, struct ib_address_vector *av );
+extern struct ib_mad_transaction *
+ib_create_madx ( struct ib_device *ibdev, struct ib_mad_interface *mi,
+		 union ib_mad *mad, struct ib_address_vector *av,
+		 struct ib_mad_transaction_operations *op );
+extern void ib_destroy_madx ( struct ib_device *ibdev,
+			      struct ib_mad_interface *mi,
+			      struct ib_mad_transaction *madx );
+extern struct ib_mad_interface * ib_create_mi ( struct ib_device *ibdev,
+						enum ib_queue_pair_type type );
+extern void ib_destroy_mi ( struct ib_device *ibdev,
+			    struct ib_mad_interface *mi );
+
+#endif /* _GPXE_IB_MI_H */