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-rw-r--r--vpp/vnet/vnet/l2/feat_bitmap.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/vpp/vnet/vnet/l2/feat_bitmap.c b/vpp/vnet/vnet/l2/feat_bitmap.c
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+++ b/vpp/vnet/vnet/l2/feat_bitmap.c
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+/*
+ * feat_bitmap.c: bitmap for managing feature invocation
+ *
+ * Copyright (c) 2013 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 <vnet/pg/pg.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ethernet/packet.h>
+#include <vlib/cli.h>
+#include <vnet/l2/l2_input.h>
+#include <vnet/l2/feat_bitmap.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/hash.h>
+#include <vppinfra/cache.h>
+
+
+/*
+ * Drop node for feature bitmaps
+ * For features that just do a drop, or are not yet implemented.
+ * Initial feature dispatch nodes don't need to set b0->error
+ * in case of a possible drop because that will be done here.
+ *The next node is always error-drop.
+ */
+
+static vlib_node_registration_t feat_bitmap_drop_node;
+
+#define foreach_feat_bitmap_drop_error \
+_(NO_FWD, "L2 feature forwarding disabled") \
+_(NYI, "L2 feature not implemented")
+
+typedef enum
+{
+#define _(sym,str) FEAT_BITMAP_DROP_ERROR_##sym,
+ foreach_feat_bitmap_drop_error
+#undef _
+ FEAT_BITMAP_DROP_N_ERROR,
+} feat_bitmap_drop_error_t;
+
+static char *feat_bitmap_drop_error_strings[] = {
+#define _(sym,string) string,
+ foreach_feat_bitmap_drop_error
+#undef _
+};
+
+typedef enum
+{
+ FEAT_BITMAP_DROP_NEXT_DROP,
+ FEAT_BITMAP_DROP_N_NEXT,
+} feat_bitmap_drop_next_t;
+
+typedef struct
+{
+ u32 feature_bitmap;
+} feat_bitmap_drop_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_feat_bitmap_drop_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 *);
+ feat_bitmap_drop_trace_t *t = va_arg (*args, feat_bitmap_drop_trace_t *);
+
+ s =
+ format (s, "feat_bitmap_drop: feature bitmap 0x%08x", t->feature_bitmap);
+ return s;
+}
+
+static uword
+feat_bitmap_drop_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ feat_bitmap_drop_next_t next_index;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors; /* number of packets to process */
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ /* get space to enqueue frame to graph node "next_index" */
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ feat_bitmap_drop_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->feature_bitmap = vnet_buffer (b0)->l2.feature_bitmap;
+ }
+
+ if (vnet_buffer (b0)->l2.feature_bitmap == 1)
+ {
+ /*
+ * If we are executing the last feature, this is the
+ * No forwarding catch-all
+ */
+ b0->error = node->errors[FEAT_BITMAP_DROP_ERROR_NO_FWD];
+ }
+ else
+ {
+ b0->error = node->errors[FEAT_BITMAP_DROP_ERROR_NYI];
+ }
+ next0 = FEAT_BITMAP_DROP_NEXT_DROP;
+
+ /* 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);
+ }
+ return frame->n_vectors;
+}
+
+clib_error_t *
+feat_bitmap_drop_init (vlib_main_t * vm)
+{
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (feat_bitmap_drop_init);
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (feat_bitmap_drop_node,static) = {
+ .function = feat_bitmap_drop_node_fn,
+ .name = "feature-bitmap-drop",
+ .vector_size = sizeof (u32),
+ .format_trace = format_feat_bitmap_drop_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(feat_bitmap_drop_error_strings),
+ .error_strings = feat_bitmap_drop_error_strings,
+
+ .n_next_nodes = FEAT_BITMAP_DROP_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [FEAT_BITMAP_DROP_NEXT_DROP] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */