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authorNeale Ranns <nranns@cisco.com>2017-03-16 07:34:55 -0400
committerFlorin Coras <florin.coras@gmail.com>2017-03-17 16:08:56 +0000
commit696e88da9799056036f329676213f3c0c0a1db9c (patch)
tree750943198b82e1c57e8a0b00fafd91848a8b3e91 /src/vnet/mpls/mpls_input.c
parent4b919a56642ccd0a44920feace872aeb5b7a62cf (diff)
MPLS performance improvments.
1 - Quad loop lookup and label imposition. 2 - optimise imposition for the 1 label case 3 - input gets TTL from header directly (no byte swap) Change-Id: I59204c9e5d134b0df75d7afa43e360f946d1ffe7 Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/mpls/mpls_input.c')
-rw-r--r--src/vnet/mpls/mpls_input.c324
1 files changed, 324 insertions, 0 deletions
diff --git a/src/vnet/mpls/mpls_input.c b/src/vnet/mpls/mpls_input.c
new file mode 100644
index 00000000000..893c45111d4
--- /dev/null
+++ b/src/vnet/mpls/mpls_input.c
@@ -0,0 +1,324 @@
+/*
+ * node.c: MPLS input
+ *
+ * Copyright (c) 2012-2014 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/pg/pg.h>
+#include <vnet/mpls/mpls.h>
+#include <vnet/feature/feature.h>
+
+typedef struct {
+ u32 next_index;
+ u32 label_net_byte_order;
+} mpls_input_trace_t;
+
+#define foreach_mpls_input_next \
+_(DROP, "error-drop") \
+_(LOOKUP, "mpls-lookup")
+
+typedef enum {
+#define _(s,n) MPLS_INPUT_NEXT_##s,
+ foreach_mpls_input_next
+#undef _
+ MPLS_INPUT_N_NEXT,
+} mpls_input_next_t;
+
+static u8 *
+format_mpls_input_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 *);
+ mpls_input_trace_t * t = va_arg (*args, mpls_input_trace_t *);
+ char * next_name;
+ u32 label;
+ next_name = "BUG!";
+ label = clib_net_to_host_u32(t->label_net_byte_order);
+
+#define _(a,b) if (t->next_index == MPLS_INPUT_NEXT_##a) next_name = b;
+ foreach_mpls_input_next;
+#undef _
+
+ s = format (s, "MPLS: next %s[%d] label %d ttl %d",
+ next_name, t->next_index,
+ vnet_mpls_uc_get_label(label),
+ vnet_mpls_uc_get_ttl(label));
+
+ return s;
+}
+
+vlib_node_registration_t mpls_input_node;
+
+typedef struct {
+ u32 last_label;
+ u32 last_inner_fib_index;
+ u32 last_outer_fib_index;
+ mpls_main_t * mpls_main;
+} mpls_input_runtime_t;
+
+static inline uword
+mpls_input_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ u32 n_left_from, next_index, * from, * to_next;
+ mpls_input_runtime_t * rt;
+ mpls_main_t * mm;
+ u32 cpu_index = os_get_cpu_number();
+ vlib_simple_counter_main_t * cm;
+ vnet_main_t * vnm = vnet_get_main();
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+ rt = vlib_node_get_runtime_data (vm, mpls_input_node.index);
+ mm = rt->mpls_main;
+ /*
+ * Force an initial lookup every time, in case the control-plane
+ * changed the label->FIB mapping.
+ */
+ rt->last_label = ~0;
+
+ next_index = node->cached_next_index;
+
+ cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
+ VNET_INTERFACE_COUNTER_MPLS);
+
+ 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, next0, sw_if_index0;
+ u32 bi1, next1, sw_if_index1;
+ vlib_buffer_t *b0, *b1;
+ char *h0, *h1;
+
+ /* 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 (h0[0]), STORE);
+ CLIB_PREFETCH (p3->data, sizeof (h1[0]), STORE);
+ }
+
+ bi0 = to_next[0] = from[0];
+ bi1 = to_next[1] = from[1];
+
+ 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);
+
+ h0 = vlib_buffer_get_current (b0);
+ h1 = vlib_buffer_get_current (b1);
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
+
+ /* TTL expired? */
+ if (PREDICT_FALSE(h0[3] == 0))
+ {
+ next0 = MPLS_INPUT_NEXT_DROP;
+ b0->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
+ }
+ else
+ {
+ next0 = MPLS_INPUT_NEXT_LOOKUP;
+ vnet_feature_arc_start(mm->input_feature_arc_index,
+ sw_if_index0, &next0, b0);
+ vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
+ }
+
+ if (PREDICT_FALSE(h1[3] == 0))
+ {
+ next1 = MPLS_INPUT_NEXT_DROP;
+ b1->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
+ }
+ else
+ {
+ next1 = MPLS_INPUT_NEXT_LOOKUP;
+ vnet_feature_arc_start(mm->input_feature_arc_index,
+ sw_if_index1, &next1, b1);
+ vlib_increment_simple_counter (cm, cpu_index, sw_if_index1, 1);
+ }
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ mpls_input_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->label_net_byte_order = *((u32*)h0);
+ }
+ if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ mpls_input_trace_t *tr = vlib_add_trace (vm, node,
+ b1, sizeof (*tr));
+ tr->next_index = next1;
+ tr->label_net_byte_order = *((u32*)h1);
+ }
+
+ 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 sw_if_index0, next0, bi0;
+ vlib_buffer_t * b0;
+ char * h0;
+
+ 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);
+ h0 = vlib_buffer_get_current (b0);
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+ /* TTL expired? */
+ if (PREDICT_FALSE(h0[3] == 0))
+ {
+ next0 = MPLS_INPUT_NEXT_DROP;
+ b0->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
+ }
+ else
+ {
+ next0 = MPLS_INPUT_NEXT_LOOKUP;
+ vnet_feature_arc_start(mm->input_feature_arc_index, sw_if_index0, &next0, b0);
+ vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
+ }
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ mpls_input_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->label_net_byte_order = *(u32*)h0;
+ }
+
+ 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);
+ }
+ vlib_node_increment_counter (vm, mpls_input_node.index,
+ MPLS_ERROR_PKTS_DECAP, from_frame->n_vectors);
+ return from_frame->n_vectors;
+}
+
+static uword
+mpls_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return mpls_input_inline (vm, node, from_frame);
+}
+
+static char * mpls_error_strings[] = {
+#define mpls_error(n,s) s,
+#include "error.def"
+#undef mpls_error
+};
+
+VLIB_REGISTER_NODE (mpls_input_node) = {
+ .function = mpls_input,
+ .name = "mpls-input",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .runtime_data_bytes = sizeof(mpls_input_runtime_t),
+
+ .n_errors = MPLS_N_ERROR,
+ .error_strings = mpls_error_strings,
+
+ .n_next_nodes = MPLS_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [MPLS_INPUT_NEXT_##s] = n,
+ foreach_mpls_input_next
+#undef _
+ },
+
+ .format_buffer = format_mpls_unicast_header_net_byte_order,
+ .format_trace = format_mpls_input_trace,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (mpls_input_node, mpls_input)
+
+static void
+mpls_setup_nodes (vlib_main_t * vm)
+{
+ mpls_input_runtime_t * rt;
+ pg_node_t * pn;
+
+ pn = pg_get_node (mpls_input_node.index);
+ pn->unformat_edit = unformat_pg_mpls_header;
+
+ rt = vlib_node_get_runtime_data (vm, mpls_input_node.index);
+ rt->last_label = (u32) ~0;
+ rt->last_inner_fib_index = 0;
+ rt->last_outer_fib_index = 0;
+ rt->mpls_main = &mpls_main;
+
+ ethernet_register_input_type (vm, ETHERNET_TYPE_MPLS_UNICAST,
+ mpls_input_node.index);
+}
+
+static clib_error_t * mpls_input_init (vlib_main_t * vm)
+{
+ clib_error_t * error;
+
+ error = vlib_call_init_function (vm, mpls_init);
+ if (error)
+ clib_error_report (error);
+
+ mpls_setup_nodes (vm);
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (mpls_input_init);
+
+static clib_error_t * mpls_input_worker_init (vlib_main_t * vm)
+{
+ mpls_input_runtime_t * rt;
+ rt = vlib_node_get_runtime_data (vm, mpls_input_node.index);
+ rt->last_label = (u32) ~0;
+ rt->last_inner_fib_index = 0;
+ rt->last_outer_fib_index = 0;
+ rt->mpls_main = &mpls_main;
+ return 0;
+}
+
+VLIB_WORKER_INIT_FUNCTION (mpls_input_worker_init);