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authorNeale Ranns <nranns@cisco.com>2017-10-21 10:53:20 -0700
committerDamjan Marion <dmarion.lists@gmail.com>2017-11-09 15:16:52 +0000
commitd792d9c01e60656cbfe1b0f1fd6a9b125f5dab0c (patch)
treedb88d99dd8102389fb92e8ed44bc7d6a55dc3080 /src/vnet/bier/bier_disp_dispatch_node.c
parenta2ff7b8cfc829ffbb6d5de7534efb51f7cba9cf3 (diff)
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>
Diffstat (limited to 'src/vnet/bier/bier_disp_dispatch_node.c')
-rw-r--r--src/vnet/bier/bier_disp_dispatch_node.c150
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)