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-rw-r--r--src/vnet/span/node.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/src/vnet/span/node.c b/src/vnet/span/node.c
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+++ b/src/vnet/span/node.c
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+/*
+ * Copyright (c) 2016 Cisco 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 <vppinfra/error.h>
+
+#include <vnet/span/span.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+vlib_node_registration_t span_node;
+
+/* packet trace format function */
+u8 *
+format_span_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 *);
+ span_trace_t *t = va_arg (*args, span_trace_t *);
+
+ vnet_main_t *vnm = &vnet_main;
+ s = format (s, "SPAN: mirrored %U -> %U",
+ format_vnet_sw_if_index_name, vnm, t->src_sw_if_index,
+ format_vnet_sw_if_index_name, vnm, t->mirror_sw_if_index);
+
+ return s;
+}
+
+#define foreach_span_error \
+_(HITS, "SPAN incomming packets processed")
+
+typedef enum
+{
+#define _(sym,str) SPAN_ERROR_##sym,
+ foreach_span_error
+#undef _
+ SPAN_N_ERROR,
+} span_error_t;
+
+static char *span_error_strings[] = {
+#define _(sym,string) string,
+ foreach_span_error
+#undef _
+};
+
+static_always_inline void
+span_mirror (vlib_main_t * vm, span_interface_t * si0, vlib_buffer_t * b0,
+ vlib_frame_t ** mirror_frames, int is_rx)
+{
+ vlib_buffer_t *c0;
+ vnet_main_t *vnm = &vnet_main;
+ u32 *to_mirror_next = 0;
+ u32 i;
+
+ if (is_rx != 0 && si0->num_rx_mirror_ports == 0)
+ return;
+
+ if (is_rx == 0 && si0->num_tx_mirror_ports == 0)
+ return;
+
+ /* Don't do it again */
+ if (PREDICT_FALSE (b0->flags & VNET_BUFFER_SPAN_CLONE))
+ return;
+
+ /* *INDENT-OFF* */
+ clib_bitmap_foreach (i, is_rx ? si0->rx_mirror_ports : si0->tx_mirror_ports, (
+ {
+ if (mirror_frames[i] == 0)
+ mirror_frames[i] = vnet_get_frame_to_sw_interface (vnm, i);
+ to_mirror_next = vlib_frame_vector_args (mirror_frames[i]);
+ to_mirror_next += mirror_frames[i]->n_vectors;
+ c0 = vlib_buffer_copy (vm, b0);
+ vnet_buffer (c0)->sw_if_index[VLIB_TX] = i;
+ c0->flags |= VNET_BUFFER_SPAN_CLONE;
+ to_mirror_next[0] = vlib_get_buffer_index (vm, c0);
+ mirror_frames[i]->n_vectors++;
+ }));
+ /* *INDENT-ON* */
+}
+
+static_always_inline uword
+span_node_inline_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame, int is_rx)
+{
+ span_main_t *sm = &span_main;
+ vnet_main_t *vnm = &vnet_main;
+ u32 n_left_from, *from, *to_next;
+ u32 n_span_packets = 0;
+ u32 next_index;
+ u32 sw_if_index;
+ static __thread vlib_frame_t **mirror_frames = 0;
+ vlib_rx_or_tx_t rxtx = is_rx ? VLIB_RX : VLIB_TX;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ vec_validate_aligned (mirror_frames, sm->max_sw_if_index,
+ CLIB_CACHE_LINE_BYTES);
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0;
+ u32 bi1;
+ vlib_buffer_t *b0;
+ vlib_buffer_t *b1;
+ span_interface_t *si0, *si1;
+ u32 sw_if_index0;
+ u32 next0 = 0;
+ u32 sw_if_index1;
+ u32 next1 = 0;
+
+ /* speculatively enqueue b0, b1 to the current next frame */
+ to_next[0] = bi0 = from[0];
+ to_next[1] = bi1 = from[1];
+ to_next += 2;
+ n_left_to_next -= 2;
+ from += 2;
+ n_left_from -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx];
+ sw_if_index1 = vnet_buffer (b1)->sw_if_index[rxtx];
+ si0 = vec_elt_at_index (sm->interfaces, sw_if_index0);
+ si1 = vec_elt_at_index (sm->interfaces, sw_if_index1);
+
+ span_mirror (vm, si0, b0, mirror_frames, is_rx);
+ span_mirror (vm, si1, b1, mirror_frames, is_rx);
+
+ vnet_feature_next (sw_if_index0, &next0, b0);
+ vnet_feature_next (sw_if_index1, &next1, b1);
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ span_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->src_sw_if_index = sw_if_index0;
+ //t->mirror_sw_if_index = si0->mirror_sw_if_index;
+ }
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ span_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t));
+ t->src_sw_if_index = sw_if_index1;
+ //t->mirror_sw_if_index = si1->mirror_sw_if_index;
+ }
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ span_interface_t *si0;
+ u32 sw_if_index0;
+ u32 next0 = 0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ to_next[0] = bi0 = from[0];
+ to_next += 1;
+ n_left_to_next -= 1;
+ from += 1;
+ n_left_from -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx];
+ si0 = vec_elt_at_index (sm->interfaces, sw_if_index0);
+ span_mirror (vm, si0, b0, mirror_frames, is_rx);
+
+ vnet_feature_next (sw_if_index0, &next0, b0);
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ span_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->src_sw_if_index = sw_if_index0;
+ }
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+ n_left_to_next, bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+
+ for (sw_if_index = 0; sw_if_index < vec_len (mirror_frames); sw_if_index++)
+ {
+ if (mirror_frames[sw_if_index] == 0)
+ continue;
+
+ vnet_put_frame_to_sw_interface (vnm, sw_if_index,
+ mirror_frames[sw_if_index]);
+ mirror_frames[sw_if_index] = 0;
+ }
+ vlib_node_increment_counter (vm, span_node.index, SPAN_ERROR_HITS,
+ n_span_packets);
+
+ return frame->n_vectors;
+}
+
+static uword
+span_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return span_node_inline_fn (vm, node, frame, 1);
+}
+
+static uword
+span_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return span_node_inline_fn (vm, node, frame, 0);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (span_input_node) = {
+ .function = span_input_node_fn,
+ .name = "span-input",
+ .vector_size = sizeof (u32),
+ .format_trace = format_span_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(span_error_strings),
+ .error_strings = span_error_strings,
+
+ .n_next_nodes = 0,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (span_input_node, span_input_node_fn)
+
+VLIB_REGISTER_NODE (span_output_node) = {
+ .function = span_output_node_fn,
+ .name = "span-output",
+ .vector_size = sizeof (u32),
+ .format_trace = format_span_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(span_error_strings),
+ .error_strings = span_error_strings,
+
+ .n_next_nodes = 0,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (span_output_node, span_output_node_fn)
+
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */