IB/MAD: Add agent trace points

Trace agent details when agents are [un]registered. In addition, report
agent details on send/recv.

Reviewed-by: "Ruhl, Michael J" <[e-mail]>
Reviewed-by: Steven Rostedt (VMware) <[e-mail]>
Signed-off-by: Ira Weiny <[e-mail]>
Signed-off-by: Jason Gunthorpe <[e-mail]>

drivers/infiniband/core/mad.c

···
 	}
 	spin_unlock_irq(&port_priv->reg_lock);
 
+	trace_ib_mad_create_agent(mad_agent_priv);
 	return &mad_agent_priv->agent;
 error6:
 	spin_unlock_irq(&port_priv->reg_lock);
···
 	struct ib_mad_port_private *port_priv;
 
 	/* Note that we could still be handling received MADs */
+	trace_ib_mad_unregister_agent(mad_agent_priv);
 
 	/*
 	 * Canceling all sends results in dropping received response
···
 
 	mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
 	if (mad_agent) {
+		trace_ib_mad_recv_done_agent(mad_agent);
 		ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
 		/*
 		 * recv is freed up in error cases in ib_mad_complete_recv
···
 	send_queue = mad_list->mad_queue;
 	qp_info = send_queue->qp_info;
 
+	trace_ib_mad_send_done_agent(mad_send_wr->mad_agent_priv);
 	trace_ib_mad_send_done_handler(mad_send_wr, wc);
 
 retry:

include/trace/events/ib_mad.h

···
 	)
 );
 
+DECLARE_EVENT_CLASS(ib_mad_agent_template,
+	TP_PROTO(struct ib_mad_agent_private *agent),
+	TP_ARGS(agent),
+
+	TP_STRUCT__entry(
+		__field(u32,            dev_index)
+		__field(u32,            hi_tid)
+		__field(u8,             port_num)
+		__field(u8,             mgmt_class)
+		__field(u8,             mgmt_class_version)
+	),
+
+	TP_fast_assign(
+		__entry->dev_index = agent->agent.device->index;
+		__entry->port_num = agent->agent.port_num;
+		__entry->hi_tid = agent->agent.hi_tid;
+
+		if (agent->reg_req) {
+			__entry->mgmt_class = agent->reg_req->mgmt_class;
+			__entry->mgmt_class_version =
+				agent->reg_req->mgmt_class_version;
+		} else {
+			__entry->mgmt_class = 0;
+			__entry->mgmt_class_version = 0;
+		}
+	),
+
+	TP_printk("%d:%d mad agent : hi_tid 0x%08x class 0x%02x class_ver 0x%02x",
+		__entry->dev_index, __entry->port_num,
+		__entry->hi_tid, __entry->mgmt_class,
+		__entry->mgmt_class_version
+	)
+);
+DEFINE_EVENT(ib_mad_agent_template, ib_mad_recv_done_agent,
+	TP_PROTO(struct ib_mad_agent_private *agent),
+	TP_ARGS(agent));
+DEFINE_EVENT(ib_mad_agent_template, ib_mad_send_done_agent,
+	TP_PROTO(struct ib_mad_agent_private *agent),
+	TP_ARGS(agent));
+DEFINE_EVENT(ib_mad_agent_template, ib_mad_create_agent,
+	TP_PROTO(struct ib_mad_agent_private *agent),
+	TP_ARGS(agent));
+DEFINE_EVENT(ib_mad_agent_template, ib_mad_unregister_agent,
+	TP_PROTO(struct ib_mad_agent_private *agent),
+	TP_ARGS(agent));
+
 
 #endif /* _TRACE_IB_MAD_H */