From 0a67b48f1d1065d250191657810bd5cd0b718c39 Mon Sep 17 00:00:00 2001
From: Dave Barach <dave@barachs.net>
Date: Mon, 8 Jun 2020 11:17:19 -0400
Subject: vlib: stop inlining vlib_add_trace(...)

Packet tracing performance doesn't justify inlining
vlib_add_trace(...) over 500 times.

It makes a 15% text-segment size difference in a representative use-case:

Inline:
$ size .../vnet_skx.dir/ipsec/ipsec_input.c.o
   text    data     bss     dec     hex filename
   6831      80       0    6911    1aff .../vnet_skx.dir/ipsec/ipsec_input.c.o

Not inline:
$ size .../vnet_skx.dir/ipsec/ipsec_input.c.o
   text    data     bss     dec     hex filename
   5776      80       0    5856    16e0 .../vnet_skx.dir/ipsec/ipsec_input.c.o

Retain the original code as vlib_add_trace_inline, instantiate once as
vlib_add_trace.

Type: refactor
Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: Iaf431dbf00c4aad03663d86f9dd1322e84d03962
---
 src/vlib/trace.c       |  9 +++++++++
 src/vlib/trace_funcs.h | 10 ++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/vlib/trace.c b/src/vlib/trace.c
index 7ee1b63f07e..f47c1b8c91d 100644
--- a/src/vlib/trace.c
+++ b/src/vlib/trace.c
@@ -572,6 +572,15 @@ vnet_is_packet_traced (vlib_buffer_t * b, u32 classify_table_index, int func)
   return 1;
 }
 
+void *
+vlib_add_trace (vlib_main_t * vm,
+		vlib_node_runtime_t * r, vlib_buffer_t * b, u32 n_data_bytes)
+{
+  return vlib_add_trace_inline (vm, r, b, n_data_bytes);
+}
+
+
+
 /*
  * fd.io coding-style-patch-verification: ON
  *
diff --git a/src/vlib/trace_funcs.h b/src/vlib/trace_funcs.h
index 4261f675aec..b25237bd7e8 100644
--- a/src/vlib/trace_funcs.h
+++ b/src/vlib/trace_funcs.h
@@ -52,8 +52,9 @@ vlib_validate_trace (vlib_trace_main_t * tm, vlib_buffer_t * b)
 void vlib_add_handoff_trace (vlib_main_t * vm, vlib_buffer_t * b);
 
 always_inline void *
-vlib_add_trace (vlib_main_t * vm,
-		vlib_node_runtime_t * r, vlib_buffer_t * b, u32 n_data_bytes)
+vlib_add_trace_inline (vlib_main_t * vm,
+		       vlib_node_runtime_t * r, vlib_buffer_t * b,
+		       u32 n_data_bytes)
 {
   vlib_trace_main_t *tm = &vm->trace_main;
   vlib_trace_header_t *h;
@@ -95,6 +96,11 @@ vlib_add_trace (vlib_main_t * vm,
   return h->data;
 }
 
+/* Non-inline (typical use-case) version of the above */
+void *vlib_add_trace (vlib_main_t * vm,
+		      vlib_node_runtime_t * r, vlib_buffer_t * b,
+		      u32 n_data_bytes);
+
 always_inline vlib_trace_header_t *
 vlib_trace_header_next (vlib_trace_header_t * h)
 {
-- 
cgit 1.2.3-korg