From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Fri, 4 Oct 2019 16:19:23 -0700
Subject: net/tls: add device decrypted trace point
Patch-mainline: v5.5-rc1
Git-commit: 9ec1c6ac27640f6a65378f11e433baa4ece12a28
References: bsc#1154353

Add a tracepoint to the TLS offload's fast path. This tracepoint
can be used to track the decrypted and encrypted status of received
records. Records decrypted by the device should have decrypted set
to 1, records which have neither decrypted nor decrypted set are
partially decrypted, require re-encryption and therefore are most
expensive to deal with.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/tls/tls_device.c |    5 +++++
 net/tls/trace.h      |   33 +++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -858,6 +858,7 @@ int tls_device_decrypted(struct sock *sk
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
 	struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx);
+	struct strp_msg *rxm = strp_msg(skb);
 	int is_decrypted = skb->decrypted;
 	int is_encrypted = !is_decrypted;
 	struct sk_buff *skb_iter;
@@ -868,6 +869,10 @@ int tls_device_decrypted(struct sock *sk
 		is_encrypted &= !skb_iter->decrypted;
 	}
 
+	trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len,
+				   tls_ctx->rx.rec_seq, rxm->full_len,
+				   is_encrypted, is_decrypted);
+
 	ctx->sw.decrypted |= is_decrypted;
 
 	/* Return immediately if the record is either entirely plaintext or
--- a/net/tls/trace.h
+++ b/net/tls/trace.h
@@ -41,6 +41,39 @@ TRACE_EVENT(tls_device_offload_set,
 	)
 );
 
+TRACE_EVENT(tls_device_decrypted,
+
+	TP_PROTO(struct sock *sk, u32 tcp_seq, u8 *rec_no, u32 rec_len,
+		 bool encrypted, bool decrypted),
+
+	TP_ARGS(sk, tcp_seq, rec_no, rec_len, encrypted, decrypted),
+
+	TP_STRUCT__entry(
+		__field(	struct sock *,	sk		)
+		__field(	u64,		rec_no		)
+		__field(	u32,		tcp_seq		)
+		__field(	u32,		rec_len		)
+		__field(	bool,		encrypted	)
+		__field(	bool,		decrypted	)
+	),
+
+	TP_fast_assign(
+		__entry->sk = sk;
+		__entry->rec_no = get_unaligned_be64(rec_no);
+		__entry->tcp_seq = tcp_seq;
+		__entry->rec_len = rec_len;
+		__entry->encrypted = encrypted;
+		__entry->decrypted = decrypted;
+	),
+
+	TP_printk(
+		"sk=%p tcp_seq=%u rec_no=%llu len=%u encrypted=%d decrypted=%d",
+		__entry->sk, __entry->tcp_seq,
+		__entry->rec_no, __entry->rec_len,
+		__entry->encrypted, __entry->decrypted
+	)
+);
+
 TRACE_EVENT(tls_device_rx_resync_send,
 
 	TP_PROTO(struct sock *sk, u32 tcp_seq, u8 *rec_no, int sync_type),