Subject: [TSN RFC v2 7/9] Add TSN event-tracing

From: Henrik Austad <[email-masked]>
Date: Mon, 30 May 2016 23:26:28 +0200

Provide a fair debug-window into TSN. It tries to use TRACE_CLASS as much
as possible and moves as much as possible of the logic into TP_printk() to
minimize tracing overhead.

Cc: "David S. Miller" <[email-masked]>
Cc: Steven Rostedt <[email-masked]> (maintainer:TRACING)
Cc: Ingo Molnar <[email-masked]> (maintainer:TRACING)
Signed-off-by: Henrik Austad <[email-masked]>
---
 include/trace/events/tsn.h |  333 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 333 insertions(+)
 create mode 100644 include/trace/events/tsn.h

Index: linux-4.9.20-rt16/include/trace/events/tsn.h
===================================================================
--- /dev/null
+++ linux-4.9.20-rt16/include/trace/events/tsn.h
@@ -0,0 +1,333 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM tsn
+
+#if !defined(_TRACE_TSN_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_TSN_H
+
+#include <linux/tsn.h>
+#include <linux/tracepoint.h>
+
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+/* #include <linux/skbuff.h> */
+DECLARE_EVENT_CLASS(tsn_buffer_template,
+
+	TP_PROTO(struct tsn_link *link,
+		size_t bytes),
+
+	TP_ARGS(link, bytes),
+
+	TP_STRUCT__entry(
+		__field(u64, stream_id)
+		__field(size_t, size)
+		__field(size_t, bsize)
+		__field(void *, buffer)
+		__field(void *, head)
+		__field(void *, tail)
+		__field(void *, end)
+		),
+
+	TP_fast_assign(
+		__entry->stream_id = link->stream_id;
+		__entry->size = bytes;
+		__entry->bsize = link->used_buffer_size;
+		__entry->buffer = link->buffer;
+		__entry->head = link->head;
+		__entry->tail = link->tail;
+		__entry->end = link->end;
+		),
+
+	TP_printk("stream_id=%llu, copy=%zd, buffer: %zd, avail=%zd, [buffer=%p, head=%p, tail=%p, end=%p]",
+		__entry->stream_id, __entry->size, __entry->bsize,
+		(__entry->head - __entry->tail) % __entry->bsize,
+		__entry->buffer,    __entry->head, __entry->tail, __entry->end)
+);
+
+DEFINE_EVENT(tsn_buffer_template, tsn_buffer_write,
+	TP_PROTO(struct tsn_link *link, size_t bytes),
+	TP_ARGS(link, bytes)
+);
+
+DEFINE_EVENT(tsn_buffer_template, tsn_buffer_write_net,
+	TP_PROTO(struct tsn_link *link, size_t bytes),
+	TP_ARGS(link, bytes)
+);
+
+DEFINE_EVENT(tsn_buffer_template, tsn_buffer_read,
+	TP_PROTO(struct tsn_link *link, size_t bytes),
+	TP_ARGS(link, bytes)
+);
+
+DEFINE_EVENT(tsn_buffer_template, tsn_buffer_read_net,
+	TP_PROTO(struct tsn_link *link, size_t bytes),
+	TP_ARGS(link, bytes)
+);
+
+
+DECLARE_EVENT_CLASS(tsn_buffer_update,
+
+	TP_PROTO(struct tsn_link *link,
+		size_t reported_avail),
+
+	TP_ARGS(link, reported_avail),
+
+	TP_STRUCT__entry(
+		__field(u64, stream_id)
+		__field(size_t, bsize)
+		__field(void *, head)
+		__field(void *, tail)
+		__field(size_t, reported_left)
+		__field(size_t, low_water)
+		),
+
+	TP_fast_assign(
+		__entry->stream_id = link->stream_id;
+		__entry->bsize = link->used_buffer_size;
+		__entry->head = link->head;
+		__entry->tail = link->tail;
+		__entry->reported_left = reported_avail;
+		__entry->low_water = link->low_water_mark;
+		),
+
+	TP_printk("stream_id=%llu, buffer_size=%zd, avail=%zd, reported=%zd, low_water=%zd",
+		__entry->stream_id, __entry->bsize,
+		(__entry->head - __entry->tail) % __entry->bsize,
+		__entry->reported_left, __entry->low_water)
+);
+
+/* Bytes will be "reported left", i.e. how much more space we have in
+ * the buffer before we wrap.
+ */
+DEFINE_EVENT(tsn_buffer_update, tsn_refill,
+	TP_PROTO(struct tsn_link *link, size_t bytes),
+	TP_ARGS(link, bytes)
+);
+
+DEFINE_EVENT(tsn_buffer_update, tsn_buffer_drain,
+	TP_PROTO(struct tsn_link *link, size_t bytes),
+	TP_ARGS(link, bytes)
+);
+
+TRACE_EVENT(tsn_send_batch,
+
+	TP_PROTO(struct tsn_link *link,
+		int num_send,
+		u64 ts_base_ns,
+		u64 ts_delta_ns),
+
+	TP_ARGS(link, num_send, ts_base_ns, ts_delta_ns),
+
+	TP_STRUCT__entry(
+		__field(u64, stream_id)
+		__field(int, seqnr)
+		__field(int, num_send)
+		__field(u64, ts_base_ns)
+		__field(u64, ts_delta_ns)
+		),
+
+	TP_fast_assign(
+		__entry->stream_id   = link->stream_id;
+		__entry->seqnr	     = (int)link->last_seqnr;
+		__entry->ts_base_ns  = ts_base_ns;
+		__entry->ts_delta_ns = ts_delta_ns;
+		__entry->num_send    = num_send;
+		),
+
+	TP_printk("stream_id=%llu, seqnr=%d, num_send=%d, ts_base_ns=%llu, ts_delta_ns=%llu",
+		__entry->stream_id, __entry->seqnr, __entry->num_send, __entry->ts_base_ns, __entry->ts_delta_ns)
+);
+
+TRACE_EVENT(tsn_rx_handler,
+
+	TP_PROTO(struct tsn_link *link,
+		const struct ethhdr *ethhdr,
+		u64 sid),
+
+	TP_ARGS(link, ethhdr, sid),
+
+	TP_STRUCT__entry(
+		__field(char *, name)
+		__field(u16, proto)
+		__field(u64, sid)
+		__field(u64, link_sid)
+		),
+	TP_fast_assign(
+		__entry->name  = link->nic->name;
+		__entry->proto = ethhdr->h_proto;
+		__entry->sid   = sid;
+		__entry->link_sid = link->stream_id;
+		),
+
+	TP_printk("name=%s, proto: 0x%04x, stream_id=%llu, link->sid=%llu",
+		__entry->name, ntohs(__entry->proto), __entry->sid, __entry->link_sid)
+);
+
+TRACE_EVENT(tsn_du,
+
+	TP_PROTO(struct tsn_link *link,
+		size_t bytes),
+
+	TP_ARGS(link, bytes),
+
+	TP_STRUCT__entry(
+		__field(u64, link_sid)
+		__field(size_t, bytes)
+		),
+	TP_fast_assign(
+		__entry->link_sid = link->stream_id;
+		__entry->bytes = bytes;
+		),
+
+	TP_printk("stream_id=%llu,bytes=%zu",
+		__entry->link_sid, __entry->bytes)
+);
+
+DECLARE_EVENT_CLASS(tsn_buffer_mgmt_class,
+
+	TP_PROTO(struct tsn_link *link, size_t size),
+
+	TP_ARGS(link, size),
+
+
+	TP_STRUCT__entry(
+		__field(u64,  stream_id)
+		__field(size_t, size)
+		),
+
+	TP_fast_assign(
+		__entry->stream_id = link->stream_id;
+		__entry->size = size;
+		),
+
+	TP_printk("stream_id=%llu,buffer_size=%zu",
+		__entry->stream_id, __entry->size)
+
+);
+
+DEFINE_EVENT(tsn_buffer_mgmt_class, tsn_set_buffer,
+	TP_PROTO(struct tsn_link *link, size_t size),
+	TP_ARGS(link, size)
+);
+
+DEFINE_EVENT(tsn_buffer_mgmt_class, tsn_free_buffer,
+	TP_PROTO(struct tsn_link *link, size_t size),
+	TP_ARGS(link, size)
+);
+
+
+/* TODO: too long, need cleanup.
+ */
+TRACE_EVENT(tsn_pre_tx,
+
+	TP_PROTO(struct tsn_link *link, struct sk_buff *skb, size_t bytes),
+
+	TP_ARGS(link, skb, bytes),
+
+	TP_STRUCT__entry(
+		__field(u64, stream_id)
+		__field(u32, vlan_tag)
+		__field(size_t, bytes)
+		__field(size_t, data_len)
+		__field(unsigned int, headlen)
+		__field(u16, protocol)
+		__field(u16, prot_native)
+		__field(int, tx_idx)
+		__field(u16, mac_len)
+		__field(u16, hdr_len)
+		__field(u16, vlan_tci)
+		__field(u16, mac_header)
+		__field(unsigned int, tail)
+		__field(unsigned int, end)
+		__field(unsigned int, truesize)
+		),
+
+	TP_fast_assign(
+		__entry->stream_id = link->stream_id;
+		__entry->vlan_tag = (skb_vlan_tag_present(skb) ? skb_vlan_tag_get(skb) : 0);
+		__entry->bytes = bytes;
+		__entry->data_len = skb->data_len;
+		__entry->headlen = skb_headlen(skb);
+		__entry->protocol = vlan_get_protocol(skb);
+		__entry->prot_native = skb->protocol;
+		__entry->tx_idx = skb_get_queue_mapping(skb);
+
+		__entry->mac_len = skb->mac_len;
+		__entry->hdr_len = skb->hdr_len;
+		__entry->vlan_tci = skb->vlan_tci;
+		__entry->mac_header = skb->mac_header;
+		__entry->tail = (unsigned int)skb->tail;
+		__entry->end  = (unsigned int)skb->end;
+		__entry->truesize = skb->truesize;
+		),
+
+	TP_printk("stream_id=%llu,vlan_tag=0x%04x,data_size=%zd,data_len=%zd,headlen=%u,proto=0x%04x (0x%04x),tx_idx=%d,mac_len=%u,hdr_len=%u,vlan_tci=0x%02x,mac_header=0x%02x,tail=%u,end=%u,truesize=%u",
+		__entry->stream_id,
+		__entry->vlan_tag,
+		__entry->bytes,
+		__entry->data_len,
+		__entry->headlen,
+		ntohs(__entry->protocol),
+		ntohs(__entry->prot_native),
+		__entry->tx_idx,
+		__entry->mac_len,
+		__entry->hdr_len,
+		__entry->vlan_tci,
+		__entry->mac_header,
+		__entry->tail,
+		__entry->end,
+		__entry->truesize)
+	);
+
+TRACE_EVENT(tsn_post_tx_set,
+
+	TP_PROTO(struct tsn_link *link, size_t sent),
+
+	TP_ARGS(link, sent),
+
+	TP_STRUCT__entry(
+		__field(u64, stream_id)
+		__field(size_t, sent)
+		),
+
+	TP_fast_assign(
+		__entry->stream_id=link->stream_id;
+		__entry->sent = sent;
+		),
+
+	TP_printk("stream_id=%llu,sent=%zu", __entry->stream_id, __entry->sent)
+
+	);
+
+TRACE_EVENT(tsn_update_net_time,
+
+	TP_PROTO(struct tsn_link *link),
+
+	TP_ARGS(link),
+
+	TP_STRUCT__entry(
+		__field(u64, stream_id)
+		__field(u64, ts_ns)
+		__field(u64, delta_ns)
+		__field(u64, delta_avg_ns)
+		__field(u64, sent_total)
+		),
+
+	TP_fast_assign(
+		__entry->stream_id = link->stream_id;
+		__entry->ts_ns = link->ts_net_ns;
+		__entry->delta_ns = link->ts_delta_ns;
+		__entry->delta_avg_ns = link->ts_exp_avg;
+		__entry->sent_total = link->frames_sent;
+		),
+
+	TP_printk("stream_id=%llu,ts=%llu,ts_delta=%llu,ts_delta_avg=%llu,sent_total=%llu",
+		__entry->stream_id,
+		__entry->ts_ns,
+		__entry->delta_ns,
+		__entry->delta_avg_ns,
+		__entry->sent_total)
+	);
+
+#endif	/* _TRACE_TSN_H || TRACE_HEADER_MULTI_READ */
+
+#include <trace/define_trace.h>