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authorDave Barach <dave@barachs.net>2019-06-21 18:24:07 -0400
committerNeale Ranns <nranns@cisco.com>2019-06-24 17:13:24 +0000
commita638c18375f17891a9455e717d8436158af12387 (patch)
treec2c1528169595172372a45aa0025c033c1ecea13 /src/vlib/handoff_trace.c
parent21b83e96d6076cda01ee80343840bc1166557150 (diff)
vlib: packet tracer support for pkt thread handoffs
Type: feature Change-Id: Ia3d9a47679202c2a47cd3746b50e86c6b8627ef6 Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'src/vlib/handoff_trace.c')
-rw-r--r--src/vlib/handoff_trace.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/src/vlib/handoff_trace.c b/src/vlib/handoff_trace.c
new file mode 100644
index 00000000000..7a6743885da
--- /dev/null
+++ b/src/vlib/handoff_trace.c
@@ -0,0 +1,125 @@
+/*
+ * handoff_trace.c - used to generate handoff trace records
+ *
+ * Copyright (c) 2019 Cisco Systems and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vppinfra/error.h>
+
+typedef struct
+{
+ u32 prev_thread;
+ u32 prev_trace_index;
+} handoff_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_handoff_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ handoff_trace_t *t = va_arg (*args, handoff_trace_t *);
+
+ s = format (s, "HANDED-OFF: from thread %d trace index %d",
+ t->prev_thread, t->prev_trace_index);
+ return s;
+}
+
+static vlib_node_registration_t handoff_trace_node;
+
+#define foreach_handoff_trace_error \
+_(BUGS, "Warning: packets sent to the handoff trace node!")
+
+typedef enum
+{
+#define _(sym,str) HANDOFF_TRACE_ERROR_##sym,
+ foreach_handoff_trace_error
+#undef _
+ HANDOFF_TRACE_N_ERROR,
+} handoff_trace_error_t;
+
+static char *handoff_trace_error_strings[] = {
+#define _(sym,string) string,
+ foreach_handoff_trace_error
+#undef _
+};
+
+static uword
+handoff_trace_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ vlib_buffer_free (vm, vlib_frame_vector_args (frame), frame->n_vectors);
+
+ vlib_node_increment_counter (vm, node->node_index,
+ HANDOFF_TRACE_ERROR_BUGS, frame->n_vectors);
+
+ return frame->n_vectors;
+}
+
+typedef enum
+{
+ HANDOFF_TRACE_NEXT_DROP,
+ HANDOFF_TRACE_N_NEXT,
+} tdummy_next_t;
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (handoff_trace_node, static) =
+{
+ .name = "handoff_trace",
+ .function = handoff_trace_node_fn,
+ .vector_size = sizeof (u32),
+ .format_trace = format_handoff_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_next_nodes = HANDOFF_TRACE_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [HANDOFF_TRACE_NEXT_DROP] = "error-drop",
+ },
+
+ .n_errors = ARRAY_LEN(handoff_trace_error_strings),
+ .error_strings = handoff_trace_error_strings,
+};
+/* *INDENT-ON* */
+
+void
+vlib_add_handoff_trace (vlib_main_t * vm, vlib_buffer_t * b)
+{
+ u32 prev_thread = vlib_buffer_get_trace_thread (b);
+ u32 prev_trace_index = vlib_buffer_get_trace_index (b);
+ handoff_trace_t *t;
+ vlib_node_runtime_t *node
+ = vlib_node_get_runtime (vm, handoff_trace_node.index);
+
+ vlib_trace_buffer (vm, node, 0 /* fake next frame index */ ,
+ b, 1 /* folllow chain */ );
+
+ t = vlib_add_trace (vm, node, b, sizeof (*t));
+
+ t->prev_thread = prev_thread;
+ t->prev_trace_index = prev_trace_index;
+}
+
+
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */