IB/UMAD: Add umad trace points

Trace MADs going to/from user space.

Suggested-by: Steven Rostedt (VMware) <[e-mail]>
Signed-off-by: Ira Weiny <[e-mail]>
Signed-off-by: Jason Gunthorpe <[e-mail]>

MAINTAINERS

···
 F:	include/uapi/rdma/
 F:	include/rdma/
 F:	include/trace/events/ib_mad.h
+F:	include/trace/events/ib_umad.h
 
 INGENIC JZ4780 DMA Driver
 M:	Zubair Lutfullah Kakakhel <[e-mail]>

drivers/infiniband/core/user_mad.c

···
 	struct ib_user_mad mad;
 };
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/ib_umad.h>
+
 static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
 static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
 				   IB_UMAD_NUM_FIXED_MINOR;
···
 				return -EFAULT;
 		}
 	}
+
+	trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr);
+
 	return hdr_size(file) + packet->length;
 }
 
···
 
 	if (copy_to_user(buf, packet->mad.data, packet->length))
 		return -EFAULT;
+
+	trace_ib_umad_read_send(file, &packet->mad.hdr,
+				(struct ib_mad_hdr *)&packet->mad.data);
 
 	return size;
 }
···
 	}
 
 	mutex_lock(&file->mutex);
+
+	trace_ib_umad_write(file, &packet->mad.hdr,
+			    (struct ib_mad_hdr *)&packet->mad.data);
 
 	agent = __get_agent(file, packet->mad.hdr.id);
 	if (!agent) {

include/trace/events/ib_umad.h

···
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+
+/*
+ * Copyright (c) 2018 Intel Corporation.  All rights reserved.
+ *
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM ib_umad
+
+#if !defined(_TRACE_IB_UMAD_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_IB_UMAD_H
+
+#include <linux/tracepoint.h>
+
+DECLARE_EVENT_CLASS(ib_umad_template,
+	TP_PROTO(struct ib_umad_file *file, struct ib_user_mad_hdr *umad_hdr,
+		 struct ib_mad_hdr *mad_hdr),
+	TP_ARGS(file, umad_hdr, mad_hdr),
+
+	TP_STRUCT__entry(
+		__field(u8, port_num)
+		__field(u8, sl)
+		__field(u8, path_bits)
+		__field(u8, grh_present)
+		__field(u32, id)
+		__field(u32, status)
+		__field(u32, timeout_ms)
+		__field(u32, retires)
+		__field(u32, length)
+		__field(u32, qpn)
+		__field(u32, qkey)
+		__field(u8, gid_index)
+		__field(u8, hop_limit)
+		__field(u16, lid)
+		__field(u16, attr_id)
+		__field(u16, pkey_index)
+		__field(u8, base_version)
+		__field(u8, mgmt_class)
+		__field(u8, class_version)
+		__field(u8, method)
+		__field(u32, flow_label)
+		__field(u16, mad_status)
+		__field(u16, class_specific)
+		__field(u32, attr_mod)
+		__field(u64, tid)
+		__array(u8, gid, 16)
+		__field(u32, dev_index)
+		__field(u8,  traffic_class)
+	),
+
+	TP_fast_assign(
+		__entry->dev_index = file->port->ib_dev->index;
+		__entry->port_num = file->port->port_num;
+
+		__entry->id = umad_hdr->id;
+		__entry->status = umad_hdr->status;
+		__entry->timeout_ms = umad_hdr->timeout_ms;
+		__entry->retires = umad_hdr->retries;
+		__entry->length = umad_hdr->length;
+		__entry->qpn = umad_hdr->qpn;
+		__entry->qkey = umad_hdr->qkey;
+		__entry->lid = umad_hdr->lid;
+		__entry->sl = umad_hdr->sl;
+		__entry->path_bits = umad_hdr->path_bits;
+		__entry->grh_present = umad_hdr->grh_present;
+		__entry->gid_index = umad_hdr->gid_index;
+		__entry->hop_limit = umad_hdr->hop_limit;
+		__entry->traffic_class = umad_hdr->traffic_class;
+		memcpy(__entry->gid, umad_hdr->gid, sizeof(umad_hdr->gid));
+		__entry->flow_label = umad_hdr->flow_label;
+		__entry->pkey_index = umad_hdr->pkey_index;
+
+		__entry->base_version = mad_hdr->base_version;
+		__entry->mgmt_class = mad_hdr->mgmt_class;
+		__entry->class_version = mad_hdr->class_version;
+		__entry->method = mad_hdr->method;
+		__entry->mad_status = mad_hdr->status;
+		__entry->class_specific = mad_hdr->class_specific;
+		__entry->tid = mad_hdr->tid;
+		__entry->attr_id = mad_hdr->attr_id;
+		__entry->attr_mod = mad_hdr->attr_mod;
+	),
+
+	TP_printk("%d:%d umad_hdr: id 0x%08x status 0x%08x ms %u ret %u " \
+		  "len %u QP%u qkey 0x%08x lid 0x%04x sl %u path_bits 0x%x " \
+		  "grh 0x%x gidi %u hop_lim %u traf_cl %u gid %pI6c " \
+		  "flow 0x%08x pkeyi %u  MAD: base_ver 0x%x class 0x%x " \
+		  "class_ver 0x%x method 0x%x status 0x%04x " \
+		  "class_specific 0x%04x tid 0x%016llx attr_id 0x%04x " \
+		  "attr_mod 0x%08x ",
+		__entry->dev_index, __entry->port_num,
+		__entry->id, __entry->status, __entry->timeout_ms,
+		__entry->retires, __entry->length, be32_to_cpu(__entry->qpn),
+		be32_to_cpu(__entry->qkey), be16_to_cpu(__entry->lid),
+		__entry->sl, __entry->path_bits, __entry->grh_present,
+		__entry->gid_index, __entry->hop_limit,
+		__entry->traffic_class, &__entry->gid,
+		be32_to_cpu(__entry->flow_label), __entry->pkey_index,
+		__entry->base_version, __entry->mgmt_class,
+		__entry->class_version, __entry->method,
+		be16_to_cpu(__entry->mad_status),
+		be16_to_cpu(__entry->class_specific),
+		be64_to_cpu(__entry->tid), be16_to_cpu(__entry->attr_id),
+		be32_to_cpu(__entry->attr_mod)
+	)
+);
+
+DEFINE_EVENT(ib_umad_template, ib_umad_write,
+	TP_PROTO(struct ib_umad_file *file, struct ib_user_mad_hdr *umad_hdr,
+		 struct ib_mad_hdr *mad_hdr),
+	TP_ARGS(file, umad_hdr, mad_hdr));
+
+DEFINE_EVENT(ib_umad_template, ib_umad_read_recv,
+	TP_PROTO(struct ib_umad_file *file, struct ib_user_mad_hdr *umad_hdr,
+		 struct ib_mad_hdr *mad_hdr),
+	TP_ARGS(file, umad_hdr, mad_hdr));
+
+DEFINE_EVENT(ib_umad_template, ib_umad_read_send,
+	TP_PROTO(struct ib_umad_file *file, struct ib_user_mad_hdr *umad_hdr,
+		 struct ib_mad_hdr *mad_hdr),
+	TP_ARGS(file, umad_hdr, mad_hdr));
+
+#endif /* _TRACE_IB_UMAD_H */
+
+#include <trace/define_trace.h>