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Date: Tue, 2 Dec 2014 12:37:42 -0800
From: Martin KaFai Lau <kafai@...com>
To: <davem@...emloft.net>
CC: <netdev@...r.kernel.org>
Subject: [PATCH net-next] tcp: Add TCP tracer
Define probes and register them to the TCP tracepoints. The probes
collect the data defined in struct tcp_sk_trace and record them to
the tracing's ring_buffer.
---
include/uapi/linux/tcp_trace.h | 9 +-
kernel/trace/tcp_trace.c | 448 +++++++++++++++++++++++++++++++++++++++++
kernel/trace/trace.h | 1 +
3 files changed, 451 insertions(+), 7 deletions(-)
diff --git a/include/uapi/linux/tcp_trace.h b/include/uapi/linux/tcp_trace.h
index 2644f7f..d913a3c 100644
--- a/include/uapi/linux/tcp_trace.h
+++ b/include/uapi/linux/tcp_trace.h
@@ -22,11 +22,11 @@ struct tcp_stats {
__u32 other_segs_retrans;
__u32 other_octets_retrans;
__u32 loss_segs_retrans;
- __u32 loss_octects_retrans;
+ __u32 loss_octets_retrans;
__u32 segs_in;
__u32 data_segs_in;
- __u64 rtt_sample_us;
__u64 data_octets_in;
+ __u64 rtt_sample_us;
__u64 max_rtt_us;
__u64 min_rtt_us;
__u64 sum_rtt_us;
@@ -64,9 +64,4 @@ struct tcp_trace_stats {
struct tcp_stats stats;
} __packed;
-typedef struct tcp_trace_basic tcp_trace_establish;
-typedef struct tcp_trace_basic tcp_trace_retrans;
-typedef struct tcp_trace_stats tcp_trace_periodic;
-typedef struct tcp_trace_stats tcp_trace_close;
-
#endif /* UAPI_TCP_TRACE_H */
diff --git a/kernel/trace/tcp_trace.c b/kernel/trace/tcp_trace.c
index 9d09fd0..376580b 100644
--- a/kernel/trace/tcp_trace.c
+++ b/kernel/trace/tcp_trace.c
@@ -1,9 +1,27 @@
#include <net/tcp_trace.h>
+#include <net/tcp.h>
+#include <trace/events/tcp.h>
#include <linux/tcp.h>
+#include <linux/ipv6.h>
+#include <linux/ftrace_event.h>
+#include <linux/jiffies.h>
#include <uapi/linux/tcp_trace.h>
+#include "trace_output.h"
+
+#define REPORT_INTERVAL_MS 2000
+
+static struct trace_array *tcp_tr;
static bool tcp_trace_enabled __read_mostly;
+static struct trace_print_flags tcp_trace_event_names[] = {
+ { TCP_TRACE_EVENT_ESTABLISHED, "established" },
+ { TCP_TRACE_EVENT_PERIODIC, "periodic" },
+ { TCP_TRACE_EVENT_RETRANS, "retrans" },
+ { TCP_TRACE_EVENT_RETRANS_LOSS, "retrans_loss" },
+ { TCP_TRACE_EVENT_CLOSE, "close" }
+};
+
struct tcp_sk_trace {
struct tcp_stats stats;
unsigned long start_ts;
@@ -35,3 +53,433 @@ void tcp_sk_trace_destruct(struct sock *sk)
{
kfree(tcp_sk(sk)->trace);
}
+
+static void tcp_trace_init(struct tcp_trace *tr,
+ enum tcp_trace_events trev,
+ struct sock *sk)
+{
+ tr->event = trev;
+ if (sk->sk_family == AF_INET) {
+ tr->ipv6 = 0;
+ tr->local_addr[0] = inet_sk(sk)->inet_saddr;
+ tr->remote_addr[0] = inet_sk(sk)->inet_daddr;
+ } else {
+ BUG_ON(sk->sk_family != AF_INET6);
+ tr->ipv6 = 1;
+ memcpy(tr->local_addr, inet6_sk(sk)->saddr.s6_addr32,
+ sizeof(tr->local_addr));
+ memcpy(tr->remote_addr, sk->sk_v6_daddr.s6_addr32,
+ sizeof(tr->remote_addr));
+ }
+ tr->local_port = inet_sk(sk)->inet_sport;
+ tr->remote_port = inet_sk(sk)->inet_dport;
+}
+
+static void tcp_trace_basic_init(struct tcp_trace_basic *trb,
+ enum tcp_trace_events trev,
+ struct sock *sk)
+{
+ struct tcp_sk_trace *sktr = tcp_sk(sk)->trace;
+ tcp_trace_init((struct tcp_trace *)trb, trev, sk);
+ trb->snd_cwnd = tcp_sk(sk)->snd_cwnd * tcp_sk(sk)->mss_cache;
+ trb->mss = tcp_sk(sk)->mss_cache;
+ trb->ssthresh = tcp_current_ssthresh(sk);
+ trb->srtt_us = tcp_sk(sk)->srtt_us >> 3;
+ trb->rto_ms = jiffies_to_msecs(inet_csk(sk)->icsk_rto);
+ trb->life_ms = jiffies_to_msecs(jiffies - sktr->start_ts);
+}
+
+static void tcp_trace_basic_add(enum tcp_trace_events trev, struct sock *sk)
+{
+ struct ring_buffer *buffer;
+ int pc;
+ struct ring_buffer_event *event;
+ struct tcp_trace_basic *trb;
+ struct tcp_sk_trace *sktr = tcp_sk(sk)->trace;
+
+ if (!sktr)
+ return;
+
+ tracing_record_cmdline(current);
+ buffer = tcp_tr->trace_buffer.buffer;
+ pc = preempt_count();
+ event = trace_buffer_lock_reserve(buffer, TRACE_TCP,
+ sizeof(*trb), 0, pc);
+ if (!event)
+ return;
+ trb = ring_buffer_event_data(event);
+ tcp_trace_basic_init(trb, trev, sk);
+ trace_buffer_unlock_commit(buffer, event, 0, pc);
+}
+
+static void tcp_trace_stats_init(struct tcp_trace_stats *trs,
+ enum tcp_trace_events trev,
+ struct sock *sk)
+{
+ struct tcp_sk_trace *sktr = tcp_sk(sk)->trace;
+
+ tcp_trace_basic_init((struct tcp_trace_basic *)trs, trev, sk);
+ memcpy(&trs->stats, &sktr->stats, sizeof(sktr->stats));
+}
+
+static void tcp_trace_stats_add(enum tcp_trace_events trev, struct sock *sk)
+{
+ struct ring_buffer *buffer;
+ int pc;
+ struct ring_buffer_event *event;
+ struct tcp_trace_stats *trs;
+ struct tcp_sk_trace *sktr = tcp_sk(sk)->trace;
+
+ if (!sktr)
+ return;
+
+ tracing_record_cmdline(current);
+ buffer = tcp_tr->trace_buffer.buffer;
+ pc = preempt_count();
+ event = trace_buffer_lock_reserve(buffer, TRACE_TCP,
+ sizeof(*trs), 0, pc);
+ if (!event)
+ return;
+ trs = ring_buffer_event_data(event);
+
+ tcp_trace_stats_init(trs, trev, sk);
+
+ trace_buffer_unlock_commit(buffer, event, 0, pc);
+}
+
+static void tcp_trace_established(void *ignore, struct sock *sk)
+{
+ tcp_trace_basic_add(TCP_TRACE_EVENT_ESTABLISHED, sk);
+}
+
+static void tcp_trace_transmit_skb(void *ignore, struct sock *sk,
+ struct sk_buff *skb)
+{
+ int pcount;
+ struct tcp_sk_trace *sktr;
+ struct tcp_skb_cb *tcb;
+ unsigned int data_len;
+ bool retrans = false;
+
+ sktr = tcp_sk(sk)->trace;
+ if (!sktr)
+ return;
+
+ tcb = TCP_SKB_CB(skb);
+ pcount = tcp_skb_pcount(skb);
+ data_len = tcb->end_seq - tcb->seq;
+
+ sktr->stats.segs_out += pcount;
+
+ if (!data_len)
+ goto out;
+
+ sktr->stats.data_segs_out += pcount;
+ sktr->stats.data_octets_out += data_len;
+
+ if (before(tcb->seq, tcp_sk(sk)->snd_nxt)) {
+ enum tcp_trace_events trev;
+ retrans = true;
+ if (inet_csk(sk)->icsk_ca_state == TCP_CA_Loss) {
+ sktr->stats.loss_segs_retrans += pcount;
+ sktr->stats.loss_octets_retrans += data_len;
+ trev = TCP_TRACE_EVENT_RETRANS_LOSS;
+ } else {
+ sktr->stats.other_segs_retrans += pcount;
+ sktr->stats.other_octets_retrans += data_len;
+ trev = TCP_TRACE_EVENT_RETRANS;
+ }
+ tcp_trace_stats_add(trev, sk);
+ return;
+ }
+
+out:
+ if (jiffies_to_msecs(jiffies - sktr->last_ts) >=
+ REPORT_INTERVAL_MS) {
+ sktr->last_ts = jiffies;
+ tcp_trace_stats_add(TCP_TRACE_EVENT_PERIODIC, sk);
+ }
+}
+
+static void tcp_trace_rcv_established(void *ignore, struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct tcp_sk_trace *sktr;
+ unsigned int data_len;
+ struct tcphdr *th;
+
+ sktr = tcp_sk(sk)->trace;
+ if (!sktr)
+ return;
+
+ th = tcp_hdr(skb);
+ WARN_ON_ONCE(skb->len < th->doff << 2);
+
+ sktr->stats.segs_in++;
+ data_len = skb->len - (th->doff << 2);
+ if (data_len) {
+ if (TCP_SKB_CB(skb)->ack_seq == tcp_sk(sk)->snd_una)
+ sktr->stats.dup_acks_in++;
+ } else {
+ sktr->stats.data_segs_in++;
+ sktr->stats.data_segs_in += data_len;
+ }
+
+ if (jiffies_to_msecs(jiffies - sktr->last_ts) >=
+ REPORT_INTERVAL_MS) {
+ sktr->last_ts = jiffies;
+ tcp_trace_stats_add(TCP_TRACE_EVENT_PERIODIC, sk);
+ }
+}
+
+static void tcp_trace_close(void *ignore, struct sock *sk)
+{
+ struct tcp_sk_trace *sktr;
+ sktr = tcp_sk(sk)->trace;
+ if (!sktr)
+ return;
+
+ tcp_trace_stats_add(TCP_TRACE_EVENT_CLOSE, sk);
+}
+
+static void tcp_trace_ooo_rcv(void *ignore, struct sock *sk)
+{
+ struct tcp_sk_trace *sktr;
+
+ sktr = tcp_sk(sk)->trace;
+ if (!sktr)
+ return;
+
+ sktr->stats.ooo_in++;
+}
+
+static void tcp_trace_sacks_rcv(void *ignore, struct sock *sk, int num_sacks)
+{
+ struct tcp_sk_trace *sktr;
+
+ sktr = tcp_sk(sk)->trace;
+ if (!sktr)
+ return;
+
+ sktr->stats.sacks_in++;
+ sktr->stats.sack_blks_in += num_sacks;
+}
+
+void tcp_trace_rtt_sample(void *ignore, struct sock *sk,
+ long rtt_sample_us)
+{
+ struct tcp_sk_trace *sktr;
+ u32 rto_ms;
+
+ sktr = tcp_sk(sk)->trace;
+ if (!sktr)
+ return;
+
+ rto_ms = jiffies_to_msecs(inet_csk(sk)->icsk_rto);
+
+ sktr->stats.rtt_sample_us = rtt_sample_us;
+ sktr->stats.max_rtt_us = max_t(u64, sktr->stats.max_rtt_us, rtt_sample_us);
+ sktr->stats.min_rtt_us = min_t(u64, sktr->stats.min_rtt_us, rtt_sample_us);
+
+ sktr->stats.count_rtt++;
+ sktr->stats.sum_rtt_us += rtt_sample_us;
+
+ sktr->stats.max_rto_ms = max_t(u32, sktr->stats.max_rto_ms, rto_ms);
+ sktr->stats.min_rto_ms = min_t(u32, sktr->stats.min_rto_ms, rto_ms);
+}
+
+static enum print_line_t
+tcp_trace_print(struct trace_iterator *iter)
+{
+ struct trace_seq *s = &iter->seq;
+ struct tcp_trace *tr = (struct tcp_trace *)iter->ent;
+ struct tcp_trace_basic *trb;
+ struct tcp_stats *stats;
+ const char *last_seq_bptr, *cur_seq_bptr;
+ int ret = 0;
+
+ union {
+ struct sockaddr_in v4;
+ struct sockaddr_in6 v6;
+ } local_sa, remote_sa;
+
+ local_sa.v4.sin_port = tr->local_port;
+ remote_sa.v4.sin_port = tr->remote_port;
+ if (tr->ipv6) {
+ local_sa.v6.sin6_family = AF_INET6;
+ remote_sa.v6.sin6_family = AF_INET6;
+ memcpy(local_sa.v6.sin6_addr.s6_addr, tr->local_addr, 4);
+ memcpy(remote_sa.v6.sin6_addr.s6_addr, tr->remote_addr, 4);
+ } else {
+ local_sa.v4.sin_family = AF_INET;
+ remote_sa.v4.sin_family =AF_INET;
+ local_sa.v4.sin_addr.s_addr = tr->local_addr[0];
+ remote_sa.v4.sin_addr.s_addr = tr->remote_addr[0];
+ }
+
+ last_seq_bptr = ftrace_print_symbols_seq(s, tr->event,
+ tcp_trace_event_names);
+ cur_seq_bptr = trace_seq_buffer_ptr(s);
+ if (last_seq_bptr == cur_seq_bptr)
+ goto out;
+
+ trb = (struct tcp_trace_basic *)tr;
+ ret = trace_seq_printf(s,
+ " %pISpc %pISpc snd_cwnd=%u mss=%u ssthresh=%u"
+ " srtt_us=%llu rto_ms=%u life_ms=%u",
+ &local_sa, &remote_sa,
+ trb->snd_cwnd, trb->mss, trb->ssthresh,
+ trb->srtt_us, trb->rto_ms, trb->life_ms);
+
+ if (tr->event == TCP_TRACE_EVENT_ESTABLISHED || ret == 0)
+ goto out;
+
+ stats = &(((struct tcp_trace_stats *)tr)->stats);
+ ret = trace_seq_printf(s,
+ " segs_out=%u data_segs_out=%u data_octets_out=%llu"
+ " other_segs_retrans=%u other_octets_retrans=%u"
+ " loss_segs_retrans=%u loss_octets_retrans=%u"
+ " segs_in=%u data_segs_in=%u data_octets_in=%llu"
+ " max_rtt_us=%llu min_rtt_us=%llu"
+ " count_rtt=%u sum_rtt_us=%llu"
+ " rtt_sample_us=%llu"
+ " max_rto_ms=%u min_rto_ms=%u"
+ " dup_acks_in=%u sacks_in=%u"
+ " sack_blks_in=%u ooo_in=%u",
+ stats->segs_out, stats->data_segs_out, stats->data_octets_out,
+ stats->other_segs_retrans, stats->other_octets_retrans,
+ stats->loss_segs_retrans, stats->loss_octets_retrans,
+ stats->segs_in, stats->data_segs_in, stats->data_octets_in,
+ stats->max_rtt_us, stats->min_rtt_us,
+ stats->count_rtt, stats->sum_rtt_us,
+ stats->rtt_sample_us,
+ stats->max_rto_ms, stats->min_rto_ms,
+ stats->dup_acks_in, stats->sacks_in,
+ stats->sack_blks_in, stats->ooo_in);
+
+out:
+ if (ret)
+ ret = trace_seq_putc(s, '\n');
+
+ return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
+}
+
+static enum print_line_t
+tcp_trace_print_binary(struct trace_iterator *iter)
+{
+ int ret;
+ struct trace_seq *s = &iter->seq;
+ struct tcp_trace *tr = (struct tcp_trace *)iter->ent;
+ u32 magic = TCP_TRACE_MAGIC_VERSION;
+
+ ret = trace_seq_putmem(s, &magic, sizeof(magic));
+ if (!ret)
+ goto out;
+
+ if (tr->event == TCP_TRACE_EVENT_ESTABLISHED)
+ ret = trace_seq_putmem(s, tr + sizeof(magic),
+ sizeof(struct tcp_trace_basic));
+ else
+ ret = trace_seq_putmem(s, tr + sizeof(magic),
+ sizeof(struct tcp_trace_stats));
+
+out:
+ return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
+}
+
+static enum print_line_t
+tcp_tracer_print_line(struct trace_iterator *iter)
+{
+ return (trace_flags & TRACE_ITER_BIN) ?
+ tcp_trace_print_binary(iter) :
+ tcp_trace_print(iter);
+}
+
+static void tcp_register_tracepoints(void)
+{
+ int ret;
+
+ ret = register_trace_tcp_established(tcp_trace_established, NULL);
+ WARN_ON(ret);
+ ret = register_trace_tcp_close(tcp_trace_close, NULL);
+ WARN_ON(ret);
+ ret = register_trace_tcp_rcv_established(tcp_trace_rcv_established, NULL);
+ WARN_ON(ret);
+ ret = register_trace_tcp_transmit_skb(tcp_trace_transmit_skb, NULL);
+ WARN_ON(ret);
+ ret = register_trace_tcp_ooo_rcv(tcp_trace_ooo_rcv, NULL);
+ WARN_ON(ret);
+ ret = register_trace_tcp_sacks_rcv(tcp_trace_sacks_rcv, NULL);
+ WARN_ON(ret);
+ ret = register_trace_tcp_rtt_sample(tcp_trace_rtt_sample, NULL);
+ WARN_ON(ret);
+}
+
+static void tcp_unregister_tracepoints(void)
+{
+ unregister_trace_tcp_established(tcp_trace_established, NULL);
+ unregister_trace_tcp_rcv_established(tcp_trace_rcv_established, NULL);
+ unregister_trace_tcp_transmit_skb(tcp_trace_transmit_skb, NULL);
+ unregister_trace_tcp_ooo_rcv(tcp_trace_ooo_rcv, NULL);
+ unregister_trace_tcp_sacks_rcv(tcp_trace_sacks_rcv, NULL);
+ unregister_trace_tcp_rtt_sample(tcp_trace_rtt_sample, NULL);
+
+ tracepoint_synchronize_unregister();
+}
+
+static void tcp_tracer_start(struct trace_array *tr)
+{
+ tcp_register_tracepoints();
+ tcp_trace_enabled = true;
+}
+
+static void tcp_tracer_stop(struct trace_array *tr)
+{
+ tcp_unregister_tracepoints();
+ tcp_trace_enabled = false;
+}
+
+static void tcp_tracer_reset(struct trace_array *tr)
+{
+ tcp_tracer_stop(tr);
+}
+
+static int tcp_tracer_init(struct trace_array *tr)
+{
+ tcp_tr = tr;
+ tcp_tracer_start(tr);
+ return 0;
+}
+
+static struct tracer tcp_tracer __read_mostly = {
+ .name = "tcp",
+ .init = tcp_tracer_init,
+ .reset = tcp_tracer_reset,
+ .start = tcp_tracer_start,
+ .stop = tcp_tracer_stop,
+ .print_line = tcp_tracer_print_line,
+};
+
+static struct trace_event_functions tcp_trace_event_funcs;
+
+static struct trace_event tcp_trace_event = {
+ .type = TRACE_TCP,
+ .funcs = &tcp_trace_event_funcs,
+};
+
+static int __init init_tcp_tracer(void)
+{
+ if (!register_ftrace_event(&tcp_trace_event)) {
+ pr_warning("Cannot register TCP trace event\n");
+ return 1;
+ }
+
+ if (register_tracer(&tcp_tracer) != 0) {
+ pr_warning("Cannot register TCP tracer\n");
+ unregister_ftrace_event(&tcp_trace_event);
+ return 1;
+ }
+ return 0;
+}
+
+device_initcall(init_tcp_tracer);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 385391f..5dc5962 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -37,6 +37,7 @@ enum trace_type {
TRACE_USER_STACK,
TRACE_BLK,
TRACE_BPUTS,
+ TRACE_TCP,
__TRACE_LAST_TYPE,
};
--
1.8.1
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