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authorNeale Ranns <nranns@cisco.com>2019-07-19 11:44:53 +0000
committerDamjan Marion <dmarion@me.com>2019-07-24 14:42:27 +0000
commit1dbcf30b7d9691e9223c71c5fa594e7831e4ea32 (patch)
treed722f71afdac2ef8e86be5501e5fd89fc41e6364 /src/vnet/dpo/pw_cw.c
parent1e5ca9b918dfe988eb0247ec35fc188bfabb4dcb (diff)
fib: Support the POP of a Psuedo Wire Control Word
Type: feature Change-Id: Ib24547a7c4c73ceb5383d1ca8f14ec40e6a90f01 Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/dpo/pw_cw.c')
-rw-r--r--src/vnet/dpo/pw_cw.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/src/vnet/dpo/pw_cw.c b/src/vnet/dpo/pw_cw.c
new file mode 100644
index 00000000000..8c16c33cf24
--- /dev/null
+++ b/src/vnet/dpo/pw_cw.c
@@ -0,0 +1,315 @@
+/*
+ * 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/dpo/pw_cw.h>
+#include <vnet/fib/fib_node.h>
+
+#ifndef CLIB_MARCH_VARIANT
+
+/*
+ * pool of all MPLS Label DPOs
+ */
+pw_cw_dpo_t *pw_cw_dpo_pool;
+
+static pw_cw_dpo_t *
+pw_cw_dpo_alloc (void)
+{
+ pw_cw_dpo_t *pwcw;
+
+ pool_get_aligned_zero(pw_cw_dpo_pool, pwcw, 8);
+
+ return (pwcw);
+}
+
+static index_t
+pw_cw_dpo_get_index (pw_cw_dpo_t *pwcw)
+{
+ return (pwcw - pw_cw_dpo_pool);
+}
+
+void
+pw_cw_dpo_create (const dpo_id_t *parent,
+ dpo_id_t *dpo)
+{
+ pw_cw_dpo_t *pwcw;
+
+ pwcw = pw_cw_dpo_alloc();
+
+ /*
+ * stack this disposition object on the parent given
+ */
+ dpo_stack(DPO_PW_CW,
+ parent->dpoi_proto,
+ &pwcw->pwcw_parent,
+ parent);
+
+ /*
+ * set up the return DPO to refer to this object
+ */
+ dpo_set(dpo,
+ DPO_PW_CW,
+ parent->dpoi_proto,
+ pw_cw_dpo_get_index(pwcw));
+}
+
+u8*
+format_pw_cw_dpo (u8 *s, va_list *args)
+{
+ index_t pwcwi = va_arg (*args, index_t);
+ u32 indent = va_arg (*args, u32);
+ pw_cw_dpo_t *pwcw;
+
+ if (pool_is_free_index(pw_cw_dpo_pool, pwcwi))
+ {
+ /*
+ * the packet trace can be printed after the DPO has been deleted
+ */
+ return (format(s, "pw-cw[???,%d]:", pwcwi));
+ }
+
+ pwcw = pw_cw_dpo_get(pwcwi);
+ s = format(s, "pw-cw[%d]:", pwcwi);
+
+ s = format(s, "\n%U", format_white_space, indent);
+ s = format(s, "%U", format_dpo_id, &pwcw->pwcw_parent, indent+2);
+
+ return (s);
+}
+
+static void
+pw_cw_dpo_lock (dpo_id_t *dpo)
+{
+ pw_cw_dpo_t *pwcw;
+
+ pwcw = pw_cw_dpo_get(dpo->dpoi_index);
+
+ pwcw->pwcw_locks++;
+}
+
+static void
+pw_cw_dpo_unlock (dpo_id_t *dpo)
+{
+ pw_cw_dpo_t *pwcw;
+
+ pwcw = pw_cw_dpo_get(dpo->dpoi_index);
+
+ pwcw->pwcw_locks--;
+
+ if (0 == pwcw->pwcw_locks)
+ {
+ dpo_reset(&pwcw->pwcw_parent);
+ pool_put(pw_cw_dpo_pool, pwcw);
+ }
+}
+#endif /* CLIB_MARCH_VARIANT */
+
+/**
+ * @brief A struct to hold tracing information for the MPLS label imposition
+ * node.
+ */
+typedef struct pw_cw_trace_t_
+{
+ /**
+ * The CW popped
+ */
+ u32 cw;
+} pw_cw_trace_t;
+
+always_inline uword
+pw_cw_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;
+
+ 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)
+ {
+ pw_cw_dpo_t *pwcw0, *pwcw1;
+ u32 bi0, pwcwi0, bi1, pwcwi1;
+ vlib_buffer_t * b0, *b1;
+ u32 next0, next1;
+
+ bi0 = to_next[0] = from[0];
+ bi1 = to_next[1] = from[1];
+
+ /* 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, STORE);
+ vlib_prefetch_buffer_header(p3, STORE);
+
+ CLIB_PREFETCH(p2->data, sizeof(pw_cw_t), STORE);
+ CLIB_PREFETCH(p3->data, sizeof(pw_cw_t), STORE);
+ }
+
+ from += 2;
+ to_next += 2;
+ n_left_from -= 2;
+ n_left_to_next -= 2;
+
+ b0 = vlib_get_buffer(vm, bi0);
+ b1 = vlib_get_buffer(vm, bi1);
+
+ /* get the next parent DPO for the next pop */
+ pwcwi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+ pwcwi1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
+ pwcw0 = pw_cw_dpo_get(pwcwi0);
+ pwcw1 = pw_cw_dpo_get(pwcwi1);
+
+ next0 = pwcw0->pwcw_parent.dpoi_next_node;
+ next1 = pwcw1->pwcw_parent.dpoi_next_node;
+
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = pwcw0->pwcw_parent.dpoi_index;
+ vnet_buffer(b1)->ip.adj_index[VLIB_TX] = pwcw1->pwcw_parent.dpoi_index;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ pw_cw_trace_t *tr = vlib_add_trace(vm, node, b0, sizeof(*tr));
+
+ tr->cw = *((pw_cw_t*) vlib_buffer_get_current(b0));
+ }
+ if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ pw_cw_trace_t *tr = vlib_add_trace(vm, node, b1, sizeof(*tr));
+
+ tr->cw = *((pw_cw_t*) vlib_buffer_get_current(b1));
+ }
+
+ /* pop the PW CW */
+ vlib_buffer_advance (b0, sizeof(pw_cw_t));
+ vlib_buffer_advance (b1, sizeof(pw_cw_t));
+
+ 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)
+ {
+ pw_cw_dpo_t *pwcw0;
+ vlib_buffer_t * b0;
+ u32 bi0, pwcwi0;
+ u32 next0;
+
+ 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);
+
+ pwcwi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+ pwcw0 = pw_cw_dpo_get(pwcwi0);
+ next0 = pwcw0->pwcw_parent.dpoi_next_node;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = pwcw0->pwcw_parent.dpoi_index;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ pw_cw_trace_t *tr = vlib_add_trace(vm, node, b0, sizeof(*tr));
+
+ tr->cw = *((pw_cw_t*) vlib_buffer_get_current(b0));
+ }
+
+ vlib_buffer_advance (b0, sizeof(pw_cw_t));
+
+ 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_pw_cw_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 *);
+ CLIB_UNUSED(pw_cw_trace_t * t);
+
+ t = va_arg(*args, pw_cw_trace_t *);
+
+ s = format(s, "cw:0x%x", t->cw);
+
+ return (s);
+}
+
+VLIB_NODE_FN (pw_cw_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (pw_cw_pop_inline(vm, node, frame));
+}
+
+VLIB_REGISTER_NODE(pw_cw_node) = {
+ .name = "pw-cw-pop",
+ .vector_size = sizeof(u32),
+ .format_trace = format_pw_cw_trace,
+};
+
+#ifndef CLIB_MARCH_VARIANT
+static void
+pw_cw_dpo_mem_show (void)
+{
+ fib_show_memory_usage("PW-CW",
+ pool_elts(pw_cw_dpo_pool),
+ pool_len(pw_cw_dpo_pool),
+ sizeof(pw_cw_dpo_t));
+}
+
+const static dpo_vft_t pwcw_vft = {
+ .dv_lock = pw_cw_dpo_lock,
+ .dv_unlock = pw_cw_dpo_unlock,
+ .dv_format = format_pw_cw_dpo,
+ .dv_mem_show = pw_cw_dpo_mem_show,
+};
+
+const static char* const pw_cw_proto_nodes[] =
+{
+ "pw-cw-pop",
+ NULL,
+};
+
+const static char* const * const pw_cw_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = pw_cw_proto_nodes,
+ [DPO_PROTO_IP6] = pw_cw_proto_nodes,
+ [DPO_PROTO_MPLS] = pw_cw_proto_nodes,
+ [DPO_PROTO_ETHERNET] = pw_cw_proto_nodes,
+};
+
+void
+pw_cw_dpo_module_init (void)
+{
+ dpo_register(DPO_PW_CW, &pwcw_vft, pw_cw_nodes);
+}
+
+#endif /* CLIB_MARCH_VARIANT */