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Date: Wed, 4 Jan 2023 10:17:31 +0200
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: "David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Michael Jamet <michael.jamet@...el.com>,
Yehezkel Bernat <YehezkelShB@...il.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
netdev@...r.kernel.org
Subject: [PATCH 3/3] net: thunderbolt: Add tracepoints
These are useful when debugging various performance issues.
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
drivers/net/thunderbolt/Makefile | 5 +-
drivers/net/thunderbolt/main.c | 21 +++++
drivers/net/thunderbolt/trace.c | 10 +++
drivers/net/thunderbolt/trace.h | 141 +++++++++++++++++++++++++++++++
4 files changed, 176 insertions(+), 1 deletion(-)
create mode 100644 drivers/net/thunderbolt/trace.c
create mode 100644 drivers/net/thunderbolt/trace.h
diff --git a/drivers/net/thunderbolt/Makefile b/drivers/net/thunderbolt/Makefile
index dd644c8775d9..e81c2a4849f0 100644
--- a/drivers/net/thunderbolt/Makefile
+++ b/drivers/net/thunderbolt/Makefile
@@ -1,3 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_USB4_NET) := thunderbolt_net.o
-thunderbolt_net-objs := main.o
+thunderbolt_net-objs := main.o trace.o
+
+# Tracepoints need to know where to find trace.h
+CFLAGS_trace.o := -I$(src)
diff --git a/drivers/net/thunderbolt/main.c b/drivers/net/thunderbolt/main.c
index bd0c2af1172d..26ef3706445e 100644
--- a/drivers/net/thunderbolt/main.c
+++ b/drivers/net/thunderbolt/main.c
@@ -23,6 +23,8 @@
#include <net/ip6_checksum.h>
+#include "trace.h"
+
/* Protocol timeouts in ms */
#define TBNET_LOGIN_DELAY 4500
#define TBNET_LOGIN_TIMEOUT 500
@@ -353,6 +355,8 @@ static void tbnet_free_buffers(struct tbnet_ring *ring)
size = TBNET_RX_PAGE_SIZE;
}
+ trace_tbnet_free_frame(i, tf->page, tf->frame.buffer_phy, dir);
+
if (tf->frame.buffer_phy)
dma_unmap_page(dma_dev, tf->frame.buffer_phy, size,
dir);
@@ -526,6 +530,9 @@ static int tbnet_alloc_rx_buffers(struct tbnet *net, unsigned int nbuffers)
tf->frame.buffer_phy = dma_addr;
tf->dev = net->dev;
+ trace_tbnet_alloc_rx_frame(index, tf->page, dma_addr,
+ DMA_FROM_DEVICE);
+
tb_ring_rx(ring->ring, &tf->frame);
ring->prod++;
@@ -602,6 +609,8 @@ static int tbnet_alloc_tx_buffers(struct tbnet *net)
tf->frame.callback = tbnet_tx_callback;
tf->frame.sof = TBIP_PDF_FRAME_START;
tf->frame.eof = TBIP_PDF_FRAME_END;
+
+ trace_tbnet_alloc_tx_frame(i, tf->page, dma_addr, DMA_TO_DEVICE);
}
ring->cons = 0;
@@ -832,12 +841,16 @@ static int tbnet_poll(struct napi_struct *napi, int budget)
hdr = page_address(page);
if (!tbnet_check_frame(net, tf, hdr)) {
+ trace_tbnet_invalid_rx_ip_frame(hdr->frame_size,
+ hdr->frame_id, hdr->frame_index, hdr->frame_count);
__free_pages(page, TBNET_RX_PAGE_ORDER);
dev_kfree_skb_any(net->skb);
net->skb = NULL;
continue;
}
+ trace_tbnet_rx_ip_frame(hdr->frame_size, hdr->frame_id,
+ hdr->frame_index, hdr->frame_count);
frame_size = le32_to_cpu(hdr->frame_size);
skb = net->skb;
@@ -871,6 +884,7 @@ static int tbnet_poll(struct napi_struct *napi, int budget)
if (last) {
skb->protocol = eth_type_trans(skb, net->dev);
+ trace_tbnet_rx_skb(skb);
napi_gro_receive(&net->napi, skb);
net->skb = NULL;
}
@@ -990,6 +1004,8 @@ static bool tbnet_xmit_csum_and_map(struct tbnet *net, struct sk_buff *skb,
for (i = 0; i < frame_count; i++) {
hdr = page_address(frames[i]->page);
hdr->frame_count = cpu_to_le32(frame_count);
+ trace_tbnet_tx_ip_frame(hdr->frame_size, hdr->frame_id,
+ hdr->frame_index, hdr->frame_count);
dma_sync_single_for_device(dma_dev,
frames[i]->frame.buffer_phy,
tbnet_frame_size(frames[i]), DMA_TO_DEVICE);
@@ -1054,6 +1070,8 @@ static bool tbnet_xmit_csum_and_map(struct tbnet *net, struct sk_buff *skb,
len = le32_to_cpu(hdr->frame_size) - offset;
wsum = csum_partial(dest, len, wsum);
hdr->frame_count = cpu_to_le32(frame_count);
+ trace_tbnet_tx_ip_frame(hdr->frame_size, hdr->frame_id,
+ hdr->frame_index, hdr->frame_count);
offset = 0;
}
@@ -1096,6 +1114,8 @@ static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb,
bool unmap = false;
void *dest;
+ trace_tbnet_tx_skb(skb);
+
nframes = DIV_ROUND_UP(data_len, TBNET_MAX_PAYLOAD_SIZE);
if (tbnet_available_buffers(&net->tx_ring) < nframes) {
netif_stop_queue(net->dev);
@@ -1202,6 +1222,7 @@ static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb,
net->stats.tx_packets++;
net->stats.tx_bytes += skb->len;
+ trace_tbnet_consume_skb(skb);
dev_consume_skb_any(skb);
return NETDEV_TX_OK;
diff --git a/drivers/net/thunderbolt/trace.c b/drivers/net/thunderbolt/trace.c
new file mode 100644
index 000000000000..937d92826730
--- /dev/null
+++ b/drivers/net/thunderbolt/trace.c
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Tracepoints for Thunderbolt/USB4 networking driver
+ *
+ * Copyright (C) 2022, Intel Corporation
+ * Author: Mika Westerberg <mika.westerberg@...ux.intel.com>
+ */
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
diff --git a/drivers/net/thunderbolt/trace.h b/drivers/net/thunderbolt/trace.h
new file mode 100644
index 000000000000..bb1e2cbe7477
--- /dev/null
+++ b/drivers/net/thunderbolt/trace.h
@@ -0,0 +1,141 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Tracepoints for Thunderbolt/USB4 networking driver
+ *
+ * Copyright (C) 2022, Intel Corporation
+ * Author: Mika Westerberg <mika.westerberg@...ux.intel.com>
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM thunderbolt_net
+
+#if !defined(__TRACE_THUNDERBOLT_NET_H) || defined(TRACE_HEADER_MULTI_READ)
+#define __TRACE_THUNDERBOLT_NET_H
+
+#include <linux/dma-direction.h>
+#include <linux/skbuff.h>
+#include <linux/tracepoint.h>
+
+#define DMA_DATA_DIRECTION_NAMES \
+ { DMA_BIDIRECTIONAL, "DMA_BIDIRECTIONAL" }, \
+ { DMA_TO_DEVICE, "DMA_TO_DEVICE" }, \
+ { DMA_FROM_DEVICE, "DMA_FROM_DEVICE" }, \
+ { DMA_NONE, "DMA_NONE" }
+
+DECLARE_EVENT_CLASS(tbnet_frame,
+ TP_PROTO(unsigned int index, const void *page, dma_addr_t phys,
+ enum dma_data_direction dir),
+ TP_ARGS(index, page, phys, dir),
+ TP_STRUCT__entry(
+ __field(unsigned int, index)
+ __field(const void *, page)
+ __field(dma_addr_t, phys)
+ __field(enum dma_data_direction, dir)
+ ),
+ TP_fast_assign(
+ __entry->index = index;
+ __entry->page = page;
+ __entry->phys = phys;
+ __entry->dir = dir;
+ ),
+ TP_printk("index=%u page=%p phys=%pad dir=%s",
+ __entry->index, __entry->page, &__entry->phys,
+ __print_symbolic(__entry->dir, DMA_DATA_DIRECTION_NAMES))
+);
+
+DEFINE_EVENT(tbnet_frame, tbnet_alloc_rx_frame,
+ TP_PROTO(unsigned int index, const void *page, dma_addr_t phys,
+ enum dma_data_direction dir),
+ TP_ARGS(index, page, phys, dir)
+);
+
+DEFINE_EVENT(tbnet_frame, tbnet_alloc_tx_frame,
+ TP_PROTO(unsigned int index, const void *page, dma_addr_t phys,
+ enum dma_data_direction dir),
+ TP_ARGS(index, page, phys, dir)
+);
+
+DEFINE_EVENT(tbnet_frame, tbnet_free_frame,
+ TP_PROTO(unsigned int index, const void *page, dma_addr_t phys,
+ enum dma_data_direction dir),
+ TP_ARGS(index, page, phys, dir)
+);
+
+DECLARE_EVENT_CLASS(tbnet_ip_frame,
+ TP_PROTO(u32 size, u32 id, u32 index, u32 count),
+ TP_ARGS(size, id, index, count),
+ TP_STRUCT__entry(
+ __field(u32, size)
+ __field(u32, id)
+ __field(u32, index)
+ __field(u32, count)
+ ),
+ TP_fast_assign(
+ __entry->size = le32_to_cpu(size);
+ __entry->id = le32_to_cpu(id);
+ __entry->index = le32_to_cpu(index);
+ __entry->count = le32_to_cpu(count);
+ ),
+ TP_printk("id=%u size=%u index=%u count=%u",
+ __entry->id, __entry->size, __entry->index, __entry->count)
+);
+
+DEFINE_EVENT(tbnet_ip_frame, tbnet_rx_ip_frame,
+ TP_PROTO(u32 size, u32 id, u32 index, u32 count),
+ TP_ARGS(size, id, index, count)
+);
+
+DEFINE_EVENT(tbnet_ip_frame, tbnet_invalid_rx_ip_frame,
+ TP_PROTO(u32 size, u32 id, u32 index, u32 count),
+ TP_ARGS(size, id, index, count)
+);
+
+DEFINE_EVENT(tbnet_ip_frame, tbnet_tx_ip_frame,
+ TP_PROTO(u32 size, u32 id, u32 index, u32 count),
+ TP_ARGS(size, id, index, count)
+);
+
+DECLARE_EVENT_CLASS(tbnet_skb,
+ TP_PROTO(const struct sk_buff *skb),
+ TP_ARGS(skb),
+ TP_STRUCT__entry(
+ __field(const void *, addr)
+ __field(unsigned int, len)
+ __field(unsigned int, data_len)
+ __field(unsigned int, nr_frags)
+ ),
+ TP_fast_assign(
+ __entry->addr = skb;
+ __entry->len = skb->len;
+ __entry->data_len = skb->data_len;
+ __entry->nr_frags = skb_shinfo(skb)->nr_frags;
+ ),
+ TP_printk("skb=%p len=%u data_len=%u nr_frags=%u",
+ __entry->addr, __entry->len, __entry->data_len,
+ __entry->nr_frags)
+);
+
+DEFINE_EVENT(tbnet_skb, tbnet_rx_skb,
+ TP_PROTO(const struct sk_buff *skb),
+ TP_ARGS(skb)
+);
+
+DEFINE_EVENT(tbnet_skb, tbnet_tx_skb,
+ TP_PROTO(const struct sk_buff *skb),
+ TP_ARGS(skb)
+);
+
+DEFINE_EVENT(tbnet_skb, tbnet_consume_skb,
+ TP_PROTO(const struct sk_buff *skb),
+ TP_ARGS(skb)
+);
+
+#endif /* _TRACE_THUNDERBOLT_NET_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+#include <trace/define_trace.h>
--
2.35.1
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