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Subject[PATCH v2 7/9] staging: fsl-dpaa2/eth: Add trace points
Date
Add trace events in significant places of the data path.
Useful for debuggging.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
---
v2: no changes

drivers/staging/fsl-dpaa2/ethernet/Makefile | 3 +
.../staging/fsl-dpaa2/ethernet/dpaa2-eth-trace.h | 185 +++++++++++++++++++++
drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c | 21 +++
drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h | 2 +
4 files changed, 211 insertions(+)
create mode 100644 drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth-trace.h

diff --git a/drivers/staging/fsl-dpaa2/ethernet/Makefile b/drivers/staging/fsl-dpaa2/ethernet/Makefile
index 4327ebe803cb..77b0b74f835a 100644
--- a/drivers/staging/fsl-dpaa2/ethernet/Makefile
+++ b/drivers/staging/fsl-dpaa2/ethernet/Makefile
@@ -5,3 +5,6 @@
obj-$(CONFIG_FSL_DPAA2_ETH) += fsl-dpaa2-eth.o

fsl-dpaa2-eth-objs := dpaa2-eth.o dpaa2-ethtool.o dpni.o
+
+# Needed by the tracing framework
+CFLAGS_dpaa2-eth.o := -I$(src)
diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth-trace.h b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth-trace.h
new file mode 100644
index 000000000000..3b040e8d6a4e
--- /dev/null
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth-trace.h
@@ -0,0 +1,185 @@
+/* Copyright 2014-2015 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 dpaa2_eth
+
+#if !defined(_DPAA2_ETH_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _DPAA2_ETH_TRACE_H
+
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include "dpaa2-eth.h"
+#include <linux/tracepoint.h>
+
+#define TR_FMT "[%s] fd: addr=0x%llx, len=%u, off=%u"
+/* trace_printk format for raw buffer event class */
+#define TR_BUF_FMT "[%s] vaddr=%p size=%zu dma_addr=%pad map_size=%zu bpid=%d"
+
+/* This is used to declare a class of events.
+ * individual events of this type will be defined below.
+ */
+
+/* Store details about a frame descriptor */
+DECLARE_EVENT_CLASS(dpaa2_eth_fd,
+ /* Trace function prototype */
+ TP_PROTO(struct net_device *netdev,
+ const struct dpaa2_fd *fd),
+
+ /* Repeat argument list here */
+ TP_ARGS(netdev, 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(u64, fd_addr)
+ __field(u32, fd_len)
+ __field(u16, fd_offset)
+ __string(name, netdev->name)
+ ),
+
+ /* The function that assigns values to the above declared
+ * fields
+ */
+ TP_fast_assign(
+ __entry->fd_addr = dpaa2_fd_get_addr(fd);
+ __entry->fd_len = dpaa2_fd_get_len(fd);
+ __entry->fd_offset = dpaa2_fd_get_offset(fd);
+ __assign_str(name, netdev->name);
+ ),
+
+ /* This is what gets printed when the trace event is
+ * triggered.
+ */
+ TP_printk(TR_FMT,
+ __get_str(name),
+ __entry->fd_addr,
+ __entry->fd_len,
+ __entry->fd_offset)
+);
+
+/* 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(dpaa2_eth_fd, dpaa2_tx_fd,
+ TP_PROTO(struct net_device *netdev,
+ const struct dpaa2_fd *fd),
+
+ TP_ARGS(netdev, fd)
+);
+
+/* Rx fd */
+DEFINE_EVENT(dpaa2_eth_fd, dpaa2_rx_fd,
+ TP_PROTO(struct net_device *netdev,
+ const struct dpaa2_fd *fd),
+
+ TP_ARGS(netdev, fd)
+);
+
+/* Tx confirmation fd */
+DEFINE_EVENT(dpaa2_eth_fd, dpaa2_tx_conf_fd,
+ TP_PROTO(struct net_device *netdev,
+ const struct dpaa2_fd *fd),
+
+ TP_ARGS(netdev, fd)
+);
+
+/* Log data about raw buffers. Useful for tracing DPBP content. */
+TRACE_EVENT(dpaa2_eth_buf_seed,
+ /* Trace function prototype */
+ TP_PROTO(struct net_device *netdev,
+ /* virtual address and size */
+ void *vaddr,
+ size_t size,
+ /* dma map address and size */
+ dma_addr_t dma_addr,
+ size_t map_size,
+ /* buffer pool id, if relevant */
+ u16 bpid),
+
+ /* Repeat argument list here */
+ TP_ARGS(netdev, vaddr, size, dma_addr, map_size, bpid),
+
+ /* 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(void *, vaddr)
+ __field(size_t, size)
+ __field(dma_addr_t, dma_addr)
+ __field(size_t, map_size)
+ __field(u16, bpid)
+ __string(name, netdev->name)
+ ),
+
+ /* The function that assigns values to the above declared
+ * fields
+ */
+ TP_fast_assign(
+ __entry->vaddr = vaddr;
+ __entry->size = size;
+ __entry->dma_addr = dma_addr;
+ __entry->map_size = map_size;
+ __entry->bpid = bpid;
+ __assign_str(name, netdev->name);
+ ),
+
+ /* This is what gets printed when the trace event is
+ * triggered.
+ */
+ TP_printk(TR_BUF_FMT,
+ __get_str(name),
+ __entry->vaddr,
+ __entry->size,
+ &__entry->dma_addr,
+ __entry->map_size,
+ __entry->bpid)
+);
+
+/* 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 /* _DPAA2_ETH_TRACE_H */
+
+/* This must be outside ifdef _DPAA2_ETH_TRACE_H */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE dpaa2-eth-trace
+#include <trace/define_trace.h>
diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
index 67f007bdbe79..6f9eed66c64d 100644
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
@@ -42,6 +42,12 @@
#include "../../fsl-mc/include/mc-sys.h"
#include "dpaa2-eth.h"

+/* CREATE_TRACE_POINTS only needs to be defined once. Other dpa files
+ * using trace events only need to #include <trace/events/sched.h>
+ */
+#define CREATE_TRACE_POINTS
+#include "dpaa2-eth-trace.h"
+
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Freescale Semiconductor, Inc");
MODULE_DESCRIPTION("Freescale DPAA2 Ethernet Driver");
@@ -213,6 +219,9 @@ static void dpaa2_eth_rx(struct dpaa2_eth_priv *priv,
struct dpaa2_fas *fas;
u32 status = 0;

+ /* Tracing point */
+ trace_dpaa2_rx_fd(priv->net_dev, fd);
+
dma_unmap_single(dev, addr, DPAA2_ETH_RX_BUF_SIZE, DMA_FROM_DEVICE);
vaddr = phys_to_virt(addr);

@@ -583,6 +592,9 @@ static int dpaa2_eth_tx(struct sk_buff *skb, struct net_device *net_dev)
goto err_build_fd;
}

+ /* Tracing point */
+ trace_dpaa2_tx_fd(net_dev, &fd);
+
/* TxConf FQ selection primarily based on cpu affinity; this is
* non-migratable context, so it's safe to call smp_processor_id().
*/
@@ -623,6 +635,9 @@ static void dpaa2_eth_tx_conf(struct dpaa2_eth_priv *priv,
struct dpaa2_eth_drv_stats *percpu_extras;
u32 status = 0;

+ /* Tracing point */
+ trace_dpaa2_tx_conf_fd(priv->net_dev, fd);
+
percpu_extras = this_cpu_ptr(priv->percpu_extras);
percpu_extras->tx_conf_frames++;
percpu_extras->tx_conf_bytes += dpaa2_fd_get_len(fd);
@@ -707,6 +722,12 @@ static int add_bufs(struct dpaa2_eth_priv *priv, u16 bpid)
goto err_map;

buf_array[i] = addr;
+
+ /* tracing point */
+ trace_dpaa2_eth_buf_seed(priv->net_dev,
+ buf, DPAA2_ETH_BUF_RAW_SIZE,
+ addr, DPAA2_ETH_RX_BUF_SIZE,
+ bpid);
}

release_bufs:
diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
index f2b0a60795fe..c67cced55b72 100644
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
@@ -43,6 +43,8 @@
#include "dpni.h"
#include "dpni-cmd.h"

+#include "dpaa2-eth-trace.h"
+
#define DPAA2_ETH_STORE_SIZE 16

/* Maximum number of scatter-gather entries in an ingress frame,
--
2.11.0
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