sr: SRv6 uN behavior

Implements the uN behavior

Type: feature

Change-Id: Icb5efc560e09052cd183b468772cf7f799f81194
Signed-off-by: pcamaril <pcamaril@cisco.com>

1 files changed, 304 insertions, 0 deletions

diff --git a/src/plugins/srv6-un/node.c b/src/plugins/srv6-un/node.c
new file mode 100644
index 00000000000..caca18c56f2
--- /dev/null
+++ b/src/plugins/srv6-un/node.c
@@ -0,0 +1,304 @@
+/*
+ * Copyright (c) 2015 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 <srv6-un/un.h>
+
+
+/******************************* Packet tracing *******************************/
+typedef struct
+{
+  u32 localsid_index;
+} srv6_un_localsid_trace_t;
+
+
+static u8 *
+format_srv6_un_localsid_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 *);
+  srv6_un_localsid_trace_t *t = va_arg (*args, srv6_un_localsid_trace_t *);
+
+  return format (s, "SRv6-uN-localsid: localsid_index %d", t->localsid_index);
+}
+
+/********************************* Next nodes *********************************/
+typedef enum
+{
+  SRV6_UN_LOCALSID_NEXT_ERROR,
+  SRV6_UN_LOCALSID_NEXT_IP6LOOKUP,
+  SRV6_UN_LOCALSID_N_NEXT,
+} srv6_un_localsid_next_t;
+
+/******************************* Local SID node *******************************/
+
+/**
+ * @brief Graph node for applying SRv6 uN.
+ */
+static uword
+srv6_un_localsid_fn (vlib_main_t * vm,
+		     vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  ip6_sr_main_t *sm = &sr_main;
+  u32 n_left_from, next_index, *from, *to_next;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  next_index = node->cached_next_index;
+
+  u32 thread_index = vm->thread_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);
+
+      /* Quad - Loop */
+      while (n_left_from >= 8 && n_left_to_next >= 4)
+	{
+	  u32 bi0, bi1, bi2, bi3;
+	  vlib_buffer_t *b0, *b1, *b2, *b3;
+	  ip6_header_t *ip0, *ip1, *ip2, *ip3;
+	  u32 next0, next1, next2, next3;
+	  next0 = next1 = next2 = next3 = SRV6_UN_LOCALSID_NEXT_IP6LOOKUP;
+	  ip6_sr_localsid_t *ls0, *ls1, *ls2, *ls3;
+
+	  /* Prefetch next iteration. */
+	  {
+	    vlib_buffer_t *p4, *p5, *p6, *p7;
+
+	    p4 = vlib_get_buffer (vm, from[4]);
+	    p5 = vlib_get_buffer (vm, from[5]);
+	    p6 = vlib_get_buffer (vm, from[6]);
+	    p7 = vlib_get_buffer (vm, from[7]);
+
+	    /* Prefetch the buffer header and packet for the N+4 loop iteration */
+	    vlib_prefetch_buffer_header (p4, LOAD);
+	    vlib_prefetch_buffer_header (p5, LOAD);
+	    vlib_prefetch_buffer_header (p6, LOAD);
+	    vlib_prefetch_buffer_header (p7, LOAD);
+
+	    CLIB_PREFETCH (p4->data, CLIB_CACHE_LINE_BYTES, STORE);
+	    CLIB_PREFETCH (p5->data, CLIB_CACHE_LINE_BYTES, STORE);
+	    CLIB_PREFETCH (p6->data, CLIB_CACHE_LINE_BYTES, STORE);
+	    CLIB_PREFETCH (p7->data, CLIB_CACHE_LINE_BYTES, STORE);
+	  }
+
+	  to_next[0] = bi0 = from[0];
+	  to_next[1] = bi1 = from[1];
+	  to_next[2] = bi2 = from[2];
+	  to_next[3] = bi3 = from[3];
+	  from += 4;
+	  to_next += 4;
+	  n_left_from -= 4;
+	  n_left_to_next -= 4;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  b1 = vlib_get_buffer (vm, bi1);
+	  b2 = vlib_get_buffer (vm, bi2);
+	  b3 = vlib_get_buffer (vm, bi3);
+
+	  ls0 =
+	    pool_elt_at_index (sm->localsids,
+			       vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
+	  ls1 =
+	    pool_elt_at_index (sm->localsids,
+			       vnet_buffer (b1)->ip.adj_index[VLIB_TX]);
+	  ls2 =
+	    pool_elt_at_index (sm->localsids,
+			       vnet_buffer (b2)->ip.adj_index[VLIB_TX]);
+	  ls3 =
+	    pool_elt_at_index (sm->localsids,
+			       vnet_buffer (b3)->ip.adj_index[VLIB_TX]);
+
+	  ip0 = vlib_buffer_get_current (b0);
+	  ip1 = vlib_buffer_get_current (b1);
+	  ip2 = vlib_buffer_get_current (b2);
+	  ip3 = vlib_buffer_get_current (b3);
+
+	  /* Set Destination Address to Last Segment (index 0) */
+	  ip0->dst_address.as_u16[2] = ip0->dst_address.as_u16[3];
+	  ip0->dst_address.as_u16[3] = ip0->dst_address.as_u16[4];
+	  ip0->dst_address.as_u16[4] = ip0->dst_address.as_u16[5];
+	  ip0->dst_address.as_u16[5] = ip0->dst_address.as_u16[6];
+	  ip0->dst_address.as_u16[6] = ip0->dst_address.as_u16[7];
+	  ip0->dst_address.as_u16[7] = 0x0000;
+
+	  ip1->dst_address.as_u16[2] = ip1->dst_address.as_u16[3];
+	  ip1->dst_address.as_u16[3] = ip1->dst_address.as_u16[4];
+	  ip1->dst_address.as_u16[4] = ip1->dst_address.as_u16[5];
+	  ip1->dst_address.as_u16[5] = ip1->dst_address.as_u16[6];
+	  ip1->dst_address.as_u16[6] = ip1->dst_address.as_u16[7];
+	  ip1->dst_address.as_u16[7] = 0x0000;
+
+	  ip2->dst_address.as_u16[2] = ip2->dst_address.as_u16[3];
+	  ip2->dst_address.as_u16[3] = ip2->dst_address.as_u16[4];
+	  ip2->dst_address.as_u16[4] = ip2->dst_address.as_u16[5];
+	  ip2->dst_address.as_u16[5] = ip2->dst_address.as_u16[6];
+	  ip2->dst_address.as_u16[6] = ip2->dst_address.as_u16[7];
+	  ip2->dst_address.as_u16[7] = 0x0000;
+
+	  ip3->dst_address.as_u16[2] = ip3->dst_address.as_u16[3];
+	  ip3->dst_address.as_u16[3] = ip3->dst_address.as_u16[4];
+	  ip3->dst_address.as_u16[4] = ip3->dst_address.as_u16[5];
+	  ip3->dst_address.as_u16[5] = ip3->dst_address.as_u16[6];
+	  ip3->dst_address.as_u16[6] = ip3->dst_address.as_u16[7];
+	  ip3->dst_address.as_u16[7] = 0x0000;
+
+	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      srv6_un_localsid_trace_t *tr =
+		vlib_add_trace (vm, node, b0, sizeof (*tr));
+	      tr->localsid_index = ls0 - sm->localsids;
+	    }
+
+	  if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      srv6_un_localsid_trace_t *tr =
+		vlib_add_trace (vm, node, b1, sizeof (*tr));
+	      tr->localsid_index = ls1 - sm->localsids;
+	    }
+
+	  if (PREDICT_FALSE (b2->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      srv6_un_localsid_trace_t *tr =
+		vlib_add_trace (vm, node, b2, sizeof (*tr));
+	      tr->localsid_index = ls2 - sm->localsids;
+	    }
+
+	  if (PREDICT_FALSE (b3->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      srv6_un_localsid_trace_t *tr =
+		vlib_add_trace (vm, node, b3, sizeof (*tr));
+	      tr->localsid_index = ls3 - sm->localsids;
+	    }
+
+	  vlib_increment_combined_counter
+	    (((next0 ==
+	       SRV6_UN_LOCALSID_NEXT_ERROR) ?
+	      &(sm->sr_ls_invalid_counters) :
+	      &(sm->sr_ls_valid_counters)),
+	     thread_index, ls0 - sm->localsids,
+	     1, vlib_buffer_length_in_chain (vm, b0));
+
+	  vlib_increment_combined_counter
+	    (((next1 ==
+	       SRV6_UN_LOCALSID_NEXT_ERROR) ?
+	      &(sm->sr_ls_invalid_counters) :
+	      &(sm->sr_ls_valid_counters)),
+	     thread_index, ls1 - sm->localsids,
+	     1, vlib_buffer_length_in_chain (vm, b1));
+
+	  vlib_increment_combined_counter
+	    (((next2 ==
+	       SRV6_UN_LOCALSID_NEXT_ERROR) ?
+	      &(sm->sr_ls_invalid_counters) :
+	      &(sm->sr_ls_valid_counters)),
+	     thread_index, ls2 - sm->localsids,
+	     1, vlib_buffer_length_in_chain (vm, b2));
+
+	  vlib_increment_combined_counter
+	    (((next3 ==
+	       SRV6_UN_LOCALSID_NEXT_ERROR) ?
+	      &(sm->sr_ls_invalid_counters) :
+	      &(sm->sr_ls_valid_counters)),
+	     thread_index, ls3 - sm->localsids,
+	     1, vlib_buffer_length_in_chain (vm, b3));
+
+	  vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
+					   n_left_to_next, bi0, bi1, bi2, bi3,
+					   next0, next1, next2, next3);
+	}
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  u32 bi0;
+	  vlib_buffer_t *b0;
+	  ip6_header_t *ip0 = 0;
+	  u32 next0 = SRV6_UN_LOCALSID_NEXT_IP6LOOKUP;
+	  ip6_sr_localsid_t *ls0;
+	  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);
+	  ip0 = vlib_buffer_get_current (b0);
+
+	  /* Lookup the SR End behavior based on IP DA (adj) */
+	  ls0 =
+	    pool_elt_at_index (sm->localsids,
+			       vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
+
+	  /* Set Destination Address to Last Segment (index 0) */
+	  ip0->dst_address.as_u16[2] = ip0->dst_address.as_u16[3];
+	  ip0->dst_address.as_u16[3] = ip0->dst_address.as_u16[4];
+	  ip0->dst_address.as_u16[4] = ip0->dst_address.as_u16[5];
+	  ip0->dst_address.as_u16[5] = ip0->dst_address.as_u16[6];
+	  ip0->dst_address.as_u16[6] = ip0->dst_address.as_u16[7];
+	  ip0->dst_address.as_u16[7] = 0x0000;
+
+	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      srv6_un_localsid_trace_t *tr =
+		vlib_add_trace (vm, node, b0, sizeof (*tr));
+	      tr->localsid_index = ls0 - sm->localsids;
+	    }
+
+	  /* This increments the SRv6 per LocalSID counters. */
+	  vlib_increment_combined_counter (((next0 ==
+					     SRV6_UN_LOCALSID_NEXT_ERROR) ?
+					    &(sm->sr_ls_invalid_counters) :
+					    &(sm->sr_ls_valid_counters)),
+					   thread_index, ls0 - sm->localsids,
+					   1, vlib_buffer_length_in_chain (vm,
+									   b0));
+
+	  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;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (srv6_un_localsid_node) = {
+  .function = srv6_un_localsid_fn,
+  .name = "srv6-un-localsid",
+  .vector_size = sizeof (u32),
+  .format_trace = format_srv6_un_localsid_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_next_nodes = SRV6_UN_LOCALSID_N_NEXT,
+  .next_nodes = {
+    [SRV6_UN_LOCALSID_NEXT_IP6LOOKUP] = "ip6-lookup",
+    [SRV6_UN_LOCALSID_NEXT_ERROR] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+/*
+* fd.io coding-style-patch-verification: ON
+*
+* Local Variables:
+* eval: (c-set-style "gnu")
+* End:
+*/