Port NSH plugin to VPP

Please refer to https://wiki.fd.io/view/NSH_SFC

Change-Id: Iba7e33e4dbb064c1527aaddbe8dce4b6b63a627a
Signed-off-by: Hongjun Ni <hongjun.ni@intel.com>
Signed-off-by: Keith Burns (alagalah) <alagalah@gmail.com>

1 files changed, 365 insertions, 0 deletions

diff --git a/src/plugins/nsh/nsh_pop.c b/src/plugins/nsh/nsh_pop.c
new file mode 100644
index 00000000000..cd25bb9e3f7
--- /dev/null
+++ b/src/plugins/nsh/nsh_pop.c
@@ -0,0 +1,365 @@
+/*
+ * nsh_pop.c - nsh POP only processing
+ *
+ * Copyright (c) 2017 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 <vnet/vnet.h>
+#include <vnet/plugin/plugin.h>
+#include <nsh/nsh.h>
+#include <vnet/gre/gre.h>
+#include <vnet/vxlan/vxlan.h>
+#include <vnet/vxlan-gpe/vxlan_gpe.h>
+#include <vnet/l2/l2_classify.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+
+extern nsh_option_map_t * nsh_md2_lookup_option (u16 class, u8 type);
+
+extern u8 * format_nsh_header (u8 * s, va_list * args);
+extern u8 * format_nsh_node_map_trace (u8 * s, va_list * args);
+
+/* format from network order */
+u8 * format_nsh_pop_header (u8 * s, va_list * args)
+{
+  return format_nsh_header(s, args);
+}
+
+
+
+u8 * format_nsh_pop_node_map_trace (u8 * s, va_list * args)
+{
+  return format_nsh_node_map_trace(s, args);
+}
+
+
+static uword
+nsh_pop_inline (vlib_main_t * vm,
+               vlib_node_runtime_t * node,
+               vlib_frame_t * from_frame)
+{
+  u32 n_left_from, next_index, *from, *to_next;
+  nsh_main_t * nm = &nsh_main;
+
+  from = vlib_frame_vector_args(from_frame);
+  n_left_from = from_frame->n_vectors;
+
+  next_index = node->cached_next_index;
+
+  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, bi1;
+	  vlib_buffer_t * b0, *b1;
+	  u32 next0 = NSH_NODE_NEXT_DROP, next1 = NSH_NODE_NEXT_DROP;
+	  uword * entry0, *entry1;
+	  nsh_base_header_t * hdr0 = 0, *hdr1 = 0;
+	  u32 header_len0 = 0, header_len1 = 0;
+	  u32 nsp_nsi0, nsp_nsi1;
+	  u32 error0, error1;
+	  nsh_map_t * map0 = 0, *map1 = 0;
+
+	  /* Prefetch next iteration. */
+	  {
+	    vlib_buffer_t * p2, *p3;
+
+	    p2 = vlib_get_buffer(vm, from[2]);
+	    p3 = vlib_get_buffer(vm, from[3]);
+
+	    vlib_prefetch_buffer_header(p2, LOAD);
+	    vlib_prefetch_buffer_header(p3, LOAD);
+
+	    CLIB_PREFETCH(p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
+	    CLIB_PREFETCH(p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
+	  }
+
+	  bi0 = from[0];
+	  bi1 = from[1];
+	  to_next[0] = bi0;
+	  to_next[1] = bi1;
+	  from += 2;
+	  to_next += 2;
+	  n_left_from -= 2;
+	  n_left_to_next -= 2;
+
+	  error0 = 0;
+	  error1 = 0;
+
+	  b0 = vlib_get_buffer(vm, bi0);
+	  b1 = vlib_get_buffer(vm, bi1);
+	  hdr0 = vlib_buffer_get_current(b0);
+          nsp_nsi0 = hdr0->nsp_nsi;
+          header_len0 = hdr0->length * 4;
+
+          hdr1 = vlib_buffer_get_current(b1);
+	  nsp_nsi1 = hdr1->nsp_nsi;
+	  header_len1 = hdr1->length * 4;
+
+	  /* Process packet 0 */
+	  entry0 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi0);
+	  if (PREDICT_FALSE(entry0 == 0))
+	    {
+	      error0 = NSH_NODE_ERROR_NO_MAPPING;
+	      goto trace0;
+	    }
+
+	  /* Entry should point to a mapping ...*/
+	  map0 = pool_elt_at_index(nm->nsh_mappings, entry0[0]);
+	  if (PREDICT_FALSE(map0 == 0))
+	    {
+	      error0 = NSH_NODE_ERROR_NO_MAPPING;
+	      goto trace0;
+	    }
+
+	  /* set up things for next node to transmit ie which node to handle it and where */
+	  next0 = map0->next_node;
+	  //vnet_buffer(b0)->sw_if_index[VLIB_TX] = map0->sw_if_index;
+
+	  if(PREDICT_FALSE(map0->nsh_action == NSH_ACTION_POP))
+	    {
+	      /* Manipulate MD2 */
+              if(PREDICT_FALSE(hdr0->md_type == 2))
+        	{
+        	  if (PREDICT_FALSE(next0 == NSH_NODE_NEXT_DROP))
+        	    {
+        	      error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
+        	      goto trace0;
+        	    }
+	          //vnet_buffer(b0)->sw_if_index[VLIB_RX] = map0->sw_if_index;
+        	}
+
+              /* Pop NSH header */
+	      vlib_buffer_advance(b0, (word)header_len0);
+	      goto trace0;
+	    }
+
+	  entry0 = hash_get_mem(nm->nsh_entry_by_key, &map0->mapped_nsp_nsi);
+	  if (PREDICT_FALSE(entry0 == 0))
+	    {
+	      error0 = NSH_NODE_ERROR_NO_ENTRY;
+	      goto trace0;
+	    }
+
+        trace0: b0->error = error0 ? node->errors[error0] : 0;
+
+          if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+            {
+              nsh_input_trace_t *tr = vlib_add_trace(vm, node, b0, sizeof(*tr));
+              clib_memcpy ( &(tr->trace_data), hdr0, (hdr0->length*4) );
+            }
+
+	  /* Process packet 1 */
+	  entry1 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi1);
+	  if (PREDICT_FALSE(entry1 == 0))
+	    {
+	      error1 = NSH_NODE_ERROR_NO_MAPPING;
+	      goto trace1;
+	    }
+
+	  /* Entry should point to a mapping ...*/
+	  map1 = pool_elt_at_index(nm->nsh_mappings, entry1[0]);
+	  if (PREDICT_FALSE(map1 == 0))
+	    {
+	      error1 = NSH_NODE_ERROR_NO_MAPPING;
+	      goto trace1;
+	    }
+
+	  /* set up things for next node to transmit ie which node to handle it and where */
+	  next1 = map1->next_node;
+	  //vnet_buffer(b1)->sw_if_index[VLIB_TX] = map1->sw_if_index;
+
+	  if(PREDICT_FALSE(map1->nsh_action == NSH_ACTION_POP))
+	    {
+	      /* Manipulate MD2 */
+              if(PREDICT_FALSE(hdr1->md_type == 2))
+        	{
+        	  if (PREDICT_FALSE(next1 == NSH_NODE_NEXT_DROP))
+        	    {
+        	      error1 = NSH_NODE_ERROR_INVALID_OPTIONS;
+        	      goto trace1;
+        	    }
+	          //vnet_buffer(b1)->sw_if_index[VLIB_RX] = map1->sw_if_index;
+        	}
+
+              /* Pop NSH header */
+	      vlib_buffer_advance(b1, (word)header_len1);
+	      goto trace1;
+	    }
+
+	  entry1 = hash_get_mem(nm->nsh_entry_by_key, &map1->mapped_nsp_nsi);
+	  if (PREDICT_FALSE(entry1 == 0))
+	    {
+	      error1 = NSH_NODE_ERROR_NO_ENTRY;
+	      goto trace1;
+	    }
+
+
+	trace1: b1->error = error1 ? node->errors[error1] : 0;
+
+	  if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      nsh_input_trace_t *tr = vlib_add_trace(vm, node, b1, sizeof(*tr));
+	      clib_memcpy ( &(tr->trace_data), hdr1, (hdr1->length*4) );
+	    }
+
+	  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 = 0;
+	  vlib_buffer_t * b0 = NULL;
+	  u32 next0 = NSH_NODE_NEXT_DROP;
+	  uword * entry0;
+	  nsh_base_header_t * hdr0 = 0;
+	  u32 header_len0 = 0;
+	  u32 nsp_nsi0;
+	  u32 error0;
+	  nsh_map_t * map0 = 0;
+
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+	  error0 = 0;
+
+	  b0 = vlib_get_buffer(vm, bi0);
+	  hdr0 = vlib_buffer_get_current(b0);
+
+          nsp_nsi0 = hdr0->nsp_nsi;
+          header_len0 = hdr0->length * 4;
+
+	  entry0 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi0);
+
+	  if (PREDICT_FALSE(entry0 == 0))
+	    {
+	      error0 = NSH_NODE_ERROR_NO_MAPPING;
+	      goto trace00;
+	    }
+
+	  /* Entry should point to a mapping ...*/
+	  map0 = pool_elt_at_index(nm->nsh_mappings, entry0[0]);
+
+	  if (PREDICT_FALSE(map0 == 0))
+	    {
+	      error0 = NSH_NODE_ERROR_NO_MAPPING;
+	      goto trace00;
+	    }
+
+	  /* set up things for next node to transmit ie which node to handle it and where */
+	  next0 = map0->next_node;
+	  //vnet_buffer(b0)->sw_if_index[VLIB_TX] = map0->sw_if_index;
+
+	  if(PREDICT_FALSE(map0->nsh_action == NSH_ACTION_POP))
+	    {
+	      /* Manipulate MD2 */
+              if(PREDICT_FALSE(hdr0->md_type == 2))
+        	{
+        	  if (PREDICT_FALSE(next0 == NSH_NODE_NEXT_DROP))
+        	    {
+        	      error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
+        	      goto trace00;
+        	    }
+	          //vnet_buffer(b0)->sw_if_index[VLIB_RX] = map0->sw_if_index;
+        	}
+
+              /* Pop NSH header */
+	      vlib_buffer_advance(b0, (word)header_len0);
+	      goto trace00;
+	    }
+
+	  entry0 = hash_get_mem(nm->nsh_entry_by_key, &map0->mapped_nsp_nsi);
+	  if (PREDICT_FALSE(entry0 == 0))
+	    {
+	      error0 = NSH_NODE_ERROR_NO_ENTRY;
+	      goto trace00;
+	    }
+
+	  trace00: b0->error = error0 ? node->errors[error0] : 0;
+
+	  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      nsh_input_trace_t *tr = vlib_add_trace(vm, node, b0, sizeof(*tr));
+	      clib_memcpy ( &(tr->trace_data[0]), hdr0, (hdr0->length*4) );
+	    }
+
+	  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 from_frame->n_vectors;
+}
+
+/**
+ * @brief Graph processing dispatch function for NSH Input
+ *
+ * @node nsh_input
+ * @param *vm
+ * @param *node
+ * @param *from_frame
+ *
+ * @return from_frame->n_vectors
+ *
+ */
+static uword
+nsh_pop (vlib_main_t * vm, vlib_node_runtime_t * node,
+                  vlib_frame_t * from_frame)
+{
+  return nsh_pop_inline (vm, node, from_frame);
+}
+
+static char * nsh_pop_node_error_strings[] = {
+#define _(sym,string) string,
+  foreach_nsh_node_error
+#undef _
+};
+
+/* register nsh-input node */
+VLIB_REGISTER_NODE (nsh_pop_node) = {
+  .function = nsh_pop,
+  .name = "nsh-pop",
+  .vector_size = sizeof (u32),
+  .format_trace = format_nsh_pop_node_map_trace,
+  .format_buffer = format_nsh_pop_header,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(nsh_pop_node_error_strings),
+  .error_strings = nsh_pop_node_error_strings,
+
+  .n_next_nodes = NSH_NODE_N_NEXT,
+
+  .next_nodes = {
+#define _(s,n) [NSH_NODE_NEXT_##s] = n,
+    foreach_nsh_node_next
+#undef _
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (nsh_pop_node, nsh_pop);
+
+