Date:   Tue, 15 Nov 2016 10:41:06 +0200
From:   Madalin Bucur <madalin.bucur@....com>
To:     <netdev@...r.kernel.org>
CC:     <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <davem@...emloft.net>, <oss@...error.net>, <ppc@...dchasers.com>,
        <joe@...ches.com>, <pebolle@...cali.nl>,
        <joakim.tjernlund@...inera.com>
Subject: [PATCH net-next v8 6/9] dpaa_eth: add trace points

Add trace points on the hot processing path.

Signed-off-by: Ruxandra Ioana Radulescu <ruxandra.radulescu@....com>
---
 drivers/net/ethernet/freescale/dpaa/Makefile       |   1 +
 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c     |  15 +++
 drivers/net/ethernet/freescale/dpaa/dpaa_eth.h     |   1 +
 .../net/ethernet/freescale/dpaa/dpaa_eth_trace.h   | 141 +++++++++++++++++++++
 4 files changed, 158 insertions(+)
 create mode 100644 drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h

diff --git a/drivers/net/ethernet/freescale/dpaa/Makefile b/drivers/net/ethernet/freescale/dpaa/Makefile
index bfb03d4..7db50bc 100644
--- a/drivers/net/ethernet/freescale/dpaa/Makefile
+++ b/drivers/net/ethernet/freescale/dpaa/Makefile
@@ -9,3 +9,4 @@ ccflags-y += -I$(FMAN)
 obj-$(CONFIG_FSL_DPAA_ETH) += fsl_dpa.o
 
 fsl_dpa-objs += dpaa_eth.o dpaa_ethtool.o dpaa_eth_sysfs.o
+CFLAGS_dpaa_eth.o := -I$(src)
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index 07ec2fe..3c48a84 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -59,6 +59,12 @@
 #include "mac.h"
 #include "dpaa_eth.h"
 
+/* CREATE_TRACE_POINTS only needs to be defined once. Other dpaa files
+ * using trace events only need to #include <trace/events/sched.h>
+ */
+#define CREATE_TRACE_POINTS
+#include "dpaa_eth_trace.h"
+
 static int debug = -1;
 module_param(debug, int, 0444);
 MODULE_PARM_DESC(debug, "Module/Driver verbosity level (0=none,...,16=all)");
@@ -1863,6 +1869,9 @@ static inline int dpaa_xmit(struct dpaa_priv *priv,
 	if (fd->bpid == FSL_DPAA_BPID_INV)
 		fd->cmd |= qman_fq_fqid(priv->conf_fqs[queue]);
 
+	/* Trace this Tx fd */
+	trace_dpaa_tx_fd(priv->net_dev, egress_fq, fd);
+
 	for (i = 0; i < DPAA_ENQUEUE_RETRIES; i++) {
 		err = qman_enqueue(egress_fq, fd);
 		if (err != -EBUSY)
@@ -2097,6 +2106,9 @@ static enum qman_cb_dqrr_result rx_default_dqrr(struct qman_portal *portal,
 	if (!dpaa_bp)
 		return qman_cb_dqrr_consume;
 
+	/* Trace the Rx fd */
+	trace_dpaa_rx_fd(net_dev, fq, &dq->fd);
+
 	percpu_priv = this_cpu_ptr(priv->percpu_priv);
 	percpu_stats = &percpu_priv->stats;
 
@@ -2194,6 +2206,9 @@ static enum qman_cb_dqrr_result conf_dflt_dqrr(struct qman_portal *portal,
 	net_dev = ((struct dpaa_fq *)fq)->net_dev;
 	priv = netdev_priv(net_dev);
 
+	/* Trace the fd */
+	trace_dpaa_tx_conf_fd(net_dev, fq, &dq->fd);
+
 	percpu_priv = this_cpu_ptr(priv->percpu_priv);
 
 	if (dpaa_eth_napi_schedule(percpu_priv, portal))
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
index 44323e2..1f9aebf 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
@@ -37,6 +37,7 @@
 
 #include "fman.h"
 #include "mac.h"
+#include "dpaa_eth_trace.h"
 
 #define DPAA_ETH_TXQ_NUM	NR_CPUS
 
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h
new file mode 100644
index 0000000..409c1dc
--- /dev/null
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h
@@ -0,0 +1,141 @@
+/* Copyright 2013-2015 Freescale Semiconductor Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *	 notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *	 notice, this list of conditions and the following disclaimer in the
+ *	 documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Freescale Semiconductor nor the
+ *	 names of its contributors may be used to endorse or promote products
+ *	 derived from this software without specific prior written permission.
+ *
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM	dpaa_eth
+
+#if !defined(_DPAA_ETH_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _DPAA_ETH_TRACE_H
+
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include "dpaa_eth.h"
+#include <linux/tracepoint.h>
+
+#define fd_format_name(format)	{ qm_fd_##format, #format }
+#define fd_format_list	\
+	fd_format_name(contig),	\
+	fd_format_name(sg)
+
+/* This is used to declare a class of events.
+ * individual events of this type will be defined below.
+ */
+
+/* Store details about a frame descriptor and the FQ on which it was
+ * transmitted/received.
+ */
+DECLARE_EVENT_CLASS(dpaa_eth_fd,
+	/* Trace function prototype */
+	TP_PROTO(struct net_device *netdev,
+		 struct qman_fq *fq,
+		 const struct qm_fd *fd),
+
+	/* Repeat argument list here */
+	TP_ARGS(netdev, fq, fd),
+
+	/* A structure containing the relevant information we want to record.
+	 * Declare name and type for each normal element, name, type and size
+	 * for arrays. Use __string for variable length strings.
+	 */
+	TP_STRUCT__entry(
+		__field(u32,	fqid)
+		__field(u64,	fd_addr)
+		__field(u8,	fd_format)
+		__field(u16,	fd_offset)
+		__field(u32,	fd_length)
+		__field(u32,	fd_status)
+		__string(name,	netdev->name)
+	),
+
+	/* The function that assigns values to the above declared fields */
+	TP_fast_assign(
+		__entry->fqid = fq->fqid;
+		__entry->fd_addr = qm_fd_addr_get64(fd);
+		__entry->fd_format = qm_fd_get_format(fd);
+		__entry->fd_offset = qm_fd_get_offset(fd);
+		__entry->fd_length = qm_fd_get_length(fd);
+		__entry->fd_status = fd->status;
+		__assign_str(name, netdev->name);
+	),
+
+	/* This is what gets printed when the trace event is triggered */
+	TP_printk("[%s] fqid=%d, fd: addr=0x%llx, format=%s, off=%u, len=%u, status=0x%08x",
+		  __get_str(name), __entry->fqid, __entry->fd_addr,
+		  __print_symbolic(__entry->fd_format, fd_format_list),
+		  __entry->fd_offset, __entry->fd_length, __entry->fd_status)
+);
+
+/* Now declare events of the above type. Format is:
+ * DEFINE_EVENT(class, name, proto, args), with proto and args same as for class
+ */
+
+/* Tx (egress) fd */
+DEFINE_EVENT(dpaa_eth_fd, dpaa_tx_fd,
+
+	TP_PROTO(struct net_device *netdev,
+		 struct qman_fq *fq,
+		 const struct qm_fd *fd),
+
+	TP_ARGS(netdev, fq, fd)
+);
+
+/* Rx fd */
+DEFINE_EVENT(dpaa_eth_fd, dpaa_rx_fd,
+
+	TP_PROTO(struct net_device *netdev,
+		 struct qman_fq *fq,
+		 const struct qm_fd *fd),
+
+	TP_ARGS(netdev, fq, fd)
+);
+
+/* Tx confirmation fd */
+DEFINE_EVENT(dpaa_eth_fd, dpaa_tx_conf_fd,
+
+	TP_PROTO(struct net_device *netdev,
+		 struct qman_fq *fq,
+		 const struct qm_fd *fd),
+
+	TP_ARGS(netdev, fq, fd)
+);
+
+/* If only one event of a certain type needs to be declared, use TRACE_EVENT().
+ * The syntax is the same as for DECLARE_EVENT_CLASS().
+ */
+
+#endif /* _DPAA_ETH_TRACE_H */
+
+/* This must be outside ifdef _DPAA_ETH_TRACE_H */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE	dpaa_eth_trace
+#include <trace/define_trace.h>
-- 
2.1.0

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