BIER

- see draft-ietf-bier-mpls-encapsulation-10
- midpoint, head and tail functions
- supported payload protocols; IPv4 and IPv6 only.

Change-Id: I59d7363bb6fdfdce8e4016a68a9c8f5a5e5791cb
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 150 insertions, 0 deletions

diff --git a/src/vnet/bier/bier_disp_dispatch_node.c b/src/vnet/bier/bier_disp_dispatch_node.c
new file mode 100644
index 00000000000..a00c2eea5f9
--- /dev/null
+++ b/src/vnet/bier/bier_disp_dispatch_node.c
@@ -0,0 +1,150 @@
+/*
+ * 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 <vnet/bier/bier_disp_entry.h>
+#include <vnet/bier/bier_hdr_inlines.h>
+
+/**
+ * @brief A struct to hold tracing information for the MPLS label imposition
+ * node.
+ */
+typedef struct bier_disp_dispatch_trace_t_
+{
+    /**
+     * BIER payload protocol used to dispatch
+     */
+    bier_hdr_proto_id_t pproto;
+
+    /**
+     * RPF-ID packet is tagged with
+     */
+    u32 rpf_id;
+} bier_disp_dispatch_trace_t;
+
+always_inline uword
+bier_disp_dispatch_inline (vlib_main_t * vm,
+                         vlib_node_runtime_t * node,
+                         vlib_frame_t * from_frame)
+{
+    u32 n_left_from, next_index, * from, * to_next;
+
+    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 > 0 && n_left_to_next > 0)
+        {
+            bier_hdr_proto_id_t pproto0;
+            bier_disp_entry_t *bde0;
+            u32 next0, bi0, bdei0;
+            const dpo_id_t *dpo0;
+            vlib_buffer_t * b0;
+            bier_hdr_t *hdr0;
+            u32 entropy0;
+
+            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);
+            bdei0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+            hdr0 = vlib_buffer_get_current(b0);
+            bde0 = bier_disp_entry_get(bdei0);
+
+            /*
+             * header is in network order - flip it, we are about to
+             * consume it anyway
+             */
+            bier_hdr_ntoh(hdr0);
+            pproto0 = bier_hdr_get_proto_id(hdr0);
+            entropy0 = bier_hdr_get_entropy(hdr0);
+
+            /*
+             * strip the header and copy the entropy value into
+             * the packets flow-hash field
+             * DSCP mumble mumble...
+             */
+            vlib_buffer_advance(b0, (vnet_buffer(b0)->bier.n_bytes +
+                                     sizeof(*hdr0)));
+            vnet_buffer(b0)->ip.flow_hash = entropy0;
+
+            /*
+             * use the payload proto to dispatch to the
+             * correct stacked DPO.
+             */
+            dpo0 = &bde0->bde_fwd[pproto0].bde_dpo;
+            next0 = dpo0->dpoi_next_node;
+            vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
+            vnet_buffer(b0)->ip.rpf_id = bde0->bde_fwd[pproto0].bde_rpf_id;
+
+            if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+            {
+                bier_disp_dispatch_trace_t *tr =
+                    vlib_add_trace (vm, node, b0, sizeof (*tr));
+                tr->pproto = pproto0;
+                tr->rpf_id = vnet_buffer(b0)->ip.rpf_id;
+            }
+
+            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;
+}
+
+static u8 *
+format_bier_disp_dispatch_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 *);
+    bier_disp_dispatch_trace_t * t;
+
+    t = va_arg (*args, bier_disp_dispatch_trace_t *);
+    s = format (s, "%U", format_bier_hdr_proto, t->pproto);
+
+    return (s);
+}
+
+static uword
+bier_disp_dispatch (vlib_main_t * vm,
+                  vlib_node_runtime_t * node,
+                  vlib_frame_t * frame)
+{
+    return (bier_disp_dispatch_inline(vm, node, frame));
+}
+
+VLIB_REGISTER_NODE (bier_disp_dispatch_node) = {
+    .function = bier_disp_dispatch,
+    .name = "bier-disp-dispatch",
+    .vector_size = sizeof (u32),
+
+    .format_trace = format_bier_disp_dispatch_trace,
+    .n_next_nodes = 1,
+    .next_nodes = {
+        [0] = "bier-drop",
+    }
+};
+VLIB_NODE_FUNCTION_MULTIARCH (bier_disp_dispatch_node, bier_disp_dispatch)