L3 cross connect

- all packets input on interface X are load-balanced over the set of
paths provided.

Change-Id: Ic27cb88c4cd5d6d3462570632daff7a43d5a652d
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 256 insertions, 0 deletions

diff --git a/src/plugins/l3xc/l3xc_node.c b/src/plugins/l3xc/l3xc_node.c
new file mode 100644
index 00000000000..62db8c328b0
--- /dev/null
+++ b/src/plugins/l3xc/l3xc_node.c
@@ -0,0 +1,256 @@
+/*
+ * Copyright (c) 2019 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 <plugins/l3xc/l3xc.h>
+#include <vnet/feature/feature.h>
+
+typedef enum l3xc_next_t_
+{
+  L3XC_NEXT_DROP,
+  L3XC_N_NEXT,
+} l3xc_next_t;
+
+typedef struct l3xc_input_trace_t_
+{
+  index_t l3xci;
+  index_t lbi;
+} l3xc_input_trace_t;
+
+typedef enum
+{
+#define l3xc_error(n,s) L3XC_ERROR_##n,
+#include "l3xc_error.def"
+#undef l3xc_error
+  L3XC_N_ERROR,
+} l3xc_error_t;
+
+always_inline uword
+l3xc_input_inline (vlib_main_t * vm,
+		   vlib_node_runtime_t * node,
+		   vlib_frame_t * frame, fib_protocol_t fproto)
+{
+  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
+  u16 nexts[VLIB_FRAME_SIZE], *next;
+  u32 n_left, *from;
+
+  from = vlib_frame_vector_args (frame);
+  n_left = frame->n_vectors;
+  b = bufs;
+  next = nexts;
+
+  vlib_get_buffers (vm, from, bufs, n_left);
+
+  while (n_left >= 8)
+    {
+      const l3xc_t *l3xc0, *l3xc1, *l3xc2, *l3xc3;
+      u32 l3xci0, l3xci1, l3xci2, l3xci3;
+      u32 next_u32;
+
+      /* Prefetch next iteration. */
+      {
+	vlib_prefetch_buffer_header (b[4], LOAD);
+	vlib_prefetch_buffer_header (b[5], LOAD);
+	vlib_prefetch_buffer_header (b[6], LOAD);
+	vlib_prefetch_buffer_header (b[7], LOAD);
+      }
+
+      l3xci0 =
+	*(u32 *) vnet_feature_next_with_data (&next_u32, b[0],
+					      sizeof (l3xci0));
+      l3xci1 =
+	*(u32 *) vnet_feature_next_with_data (&next_u32, b[1],
+					      sizeof (l3xci1));
+      l3xci2 =
+	*(u32 *) vnet_feature_next_with_data (&next_u32, b[2],
+					      sizeof (l3xci2));
+      l3xci3 =
+	*(u32 *) vnet_feature_next_with_data (&next_u32, b[3],
+					      sizeof (l3xci3));
+
+      l3xc0 = l3xc_get (l3xci0);
+      l3xc1 = l3xc_get (l3xci1);
+      l3xc2 = l3xc_get (l3xci2);
+      l3xc3 = l3xc_get (l3xci3);
+
+      next[0] = l3xc0->l3xc_dpo.dpoi_next_node;
+      next[1] = l3xc1->l3xc_dpo.dpoi_next_node;
+      next[2] = l3xc2->l3xc_dpo.dpoi_next_node;
+      next[3] = l3xc3->l3xc_dpo.dpoi_next_node;
+
+      vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = l3xc0->l3xc_dpo.dpoi_index;
+      vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = l3xc1->l3xc_dpo.dpoi_index;
+      vnet_buffer (b[2])->ip.adj_index[VLIB_TX] = l3xc2->l3xc_dpo.dpoi_index;
+      vnet_buffer (b[3])->ip.adj_index[VLIB_TX] = l3xc3->l3xc_dpo.dpoi_index;
+
+      if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+	{
+	  if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      l3xc_input_trace_t *tr;
+
+	      tr = vlib_add_trace (vm, node, b[0], sizeof (*tr));
+	      tr->l3xci = l3xci0;
+	      tr->lbi = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
+	    }
+	  if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      l3xc_input_trace_t *tr;
+
+	      tr = vlib_add_trace (vm, node, b[1], sizeof (*tr));
+	      tr->l3xci = l3xci1;
+	      tr->lbi = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
+	    }
+	  if (PREDICT_FALSE (b[2]->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      l3xc_input_trace_t *tr;
+
+	      tr = vlib_add_trace (vm, node, b[2], sizeof (*tr));
+	      tr->l3xci = l3xci2;
+	      tr->lbi = vnet_buffer (b[2])->ip.adj_index[VLIB_TX];
+	    }
+	  if (PREDICT_FALSE (b[3]->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      l3xc_input_trace_t *tr;
+
+	      tr = vlib_add_trace (vm, node, b[3], sizeof (*tr));
+	      tr->l3xci = l3xci3;
+	      tr->lbi = vnet_buffer (b[3])->ip.adj_index[VLIB_TX];
+	    }
+	}
+
+      b += 4;
+      next += 4;
+      n_left -= 4;
+    }
+
+  while (n_left > 0)
+    {
+      u32 l3xci0, next_u32;
+      const l3xc_t *l3xc0;
+
+      l3xci0 =
+	*(u32 *) vnet_feature_next_with_data (&next_u32, b[0],
+					      sizeof (l3xci0));
+
+      l3xc0 = l3xc_get (l3xci0);
+
+      next[0] = l3xc0->l3xc_dpo.dpoi_next_node;
+
+      vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = l3xc0->l3xc_dpo.dpoi_index;
+
+      if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
+	{
+	  l3xc_input_trace_t *tr;
+
+	  tr = vlib_add_trace (vm, node, b[0], sizeof (*tr));
+	  tr->l3xci = l3xci0;
+	  tr->lbi = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
+	}
+
+      b += 1;
+      next += 1;
+      n_left -= 1;
+    }
+
+  vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
+  return frame->n_vectors;
+}
+
+static uword
+l3xc_input_ip4 (vlib_main_t * vm,
+		vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  return l3xc_input_inline (vm, node, frame, FIB_PROTOCOL_IP4);
+}
+
+static uword
+l3xc_input_ip6 (vlib_main_t * vm,
+		vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  return l3xc_input_inline (vm, node, frame, FIB_PROTOCOL_IP6);
+}
+
+static u8 *
+format_l3xc_input_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 *);
+  l3xc_input_trace_t *t = va_arg (*args, l3xc_input_trace_t *);
+
+  s = format (s, "l3xc-index:%d lb-index:%d", t->l3xci, t->lbi);
+  return s;
+}
+
+static char *l3xc_error_strings[] = {
+#define l3xc_error(n,s) s,
+#include "l3xc_error.def"
+#undef l3xc_error
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (l3xc_ip4_node) =
+{
+  .function = l3xc_input_ip4,
+  .name = "l3xc-input-ip4",
+  .vector_size = sizeof (u32),
+  .format_trace = format_l3xc_input_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = L3XC_N_ERROR,
+  .error_strings = l3xc_error_strings,
+  .n_next_nodes = L3XC_N_NEXT,
+  .next_nodes =
+  {
+    [L3XC_NEXT_DROP] = "error-drop",
+  }
+};
+
+VLIB_REGISTER_NODE (l3xc_ip6_node) =
+{
+  .function = l3xc_input_ip6,
+  .name = "l3xc-input-ip6",
+  .vector_size = sizeof (u32),
+  .format_trace = format_l3xc_input_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = 0,
+  .n_next_nodes = L3XC_N_NEXT,
+
+  .next_nodes =
+  {
+    [L3XC_NEXT_DROP] = "error-drop",
+  }
+};
+
+VNET_FEATURE_INIT (l3xc_ip4_feat, static) =
+{
+  .arc_name = "ip4-unicast",
+  .node_name = "l3xc-input-ip4",
+  .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
+};
+
+VNET_FEATURE_INIT (l3xc_ip6_feat, static) =
+{
+  .arc_name = "ip6-unicast",
+  .node_name = "l3xc-input-ip6",
+  .runs_after = VNET_FEATURES ("acl-plugin-in-ip6-fa"),
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */