diff options
Diffstat (limited to 'src/vnet/classify/flow_classify_node.c')
| -rw-r--r-- | src/vnet/classify/flow_classify_node.c | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/src/vnet/classify/flow_classify_node.c b/src/vnet/classify/flow_classify_node.c new file mode 100644 index 00000000000..d3261d33bca --- /dev/null +++ b/src/vnet/classify/flow_classify_node.c @@ -0,0 +1,338 @@ +/* + * 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 <stdint.h> + +#include <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/classify/flow_classify.h> +#include <vnet/classify/vnet_classify.h> + +typedef struct { + u32 sw_if_index; + u32 next_index; + u32 table_index; + u32 offset; +} flow_classify_trace_t; + +static u8 * +format_flow_classify_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 *); + flow_classify_trace_t * t = va_arg (*args, flow_classify_trace_t *); + + s = format (s, "FLOW_CLASSIFY: sw_if_index %d next %d table %d offset %d", + t->sw_if_index, t->next_index, t->table_index, t->offset); + return s; +} + +#define foreach_flow_classify_error \ +_(MISS, "Flow classify misses") \ +_(HIT, "Flow classify hits") \ +_(CHAIN_HIT, "Flow classify hits after chain walk") \ +_(DROP, "Flow classify action drop") + +typedef enum { +#define _(sym,str) FLOW_CLASSIFY_ERROR_##sym, + foreach_flow_classify_error +#undef _ + FLOW_CLASSIFY_N_ERROR, +} flow_classify_error_t; + +static char * flow_classify_error_strings[] = { +#define _(sym,string) string, + foreach_flow_classify_error +#undef _ +}; + +static inline uword +flow_classify_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, + flow_classify_table_id_t tid) +{ + u32 n_left_from, * from, * to_next; + flow_classify_next_index_t next_index; + flow_classify_main_t * fcm = &flow_classify_main; + vnet_classify_main_t * vcm = fcm->vnet_classify_main; + f64 now = vlib_time_now (vm); + u32 hits = 0; + u32 misses = 0; + u32 chain_hits = 0; + u32 drop = 0; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + + /* First pass: compute hashes */ + while (n_left_from > 2) + { + vlib_buffer_t * b0, * b1; + u32 bi0, bi1; + u8 * h0, * h1; + u32 sw_if_index0, sw_if_index1; + u32 table_index0, table_index1; + vnet_classify_table_t * t0, * t1; + + /* Prefetch next iteration */ + { + vlib_buffer_t * p1, * p2; + + p1 = vlib_get_buffer (vm, from[1]); + p2 = vlib_get_buffer (vm, from[2]); + + vlib_prefetch_buffer_header (p1, STORE); + CLIB_PREFETCH (p1->data, CLIB_CACHE_LINE_BYTES, STORE); + vlib_prefetch_buffer_header (p2, STORE); + CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); + } + + bi0 = from[0]; + b0 = vlib_get_buffer (vm, bi0); + h0 = b0->data; + + bi1 = from[1]; + b1 = vlib_get_buffer (vm, bi1); + h1 = b1->data; + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + table_index0 = fcm->classify_table_index_by_sw_if_index[tid][sw_if_index0]; + + sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; + table_index1 = fcm->classify_table_index_by_sw_if_index[tid][sw_if_index1]; + + t0 = pool_elt_at_index (vcm->tables, table_index0); + + t1 = pool_elt_at_index (vcm->tables, table_index1); + + vnet_buffer(b0)->l2_classify.hash = + vnet_classify_hash_packet (t0, (u8 *) h0); + + vnet_classify_prefetch_bucket (t0, vnet_buffer(b0)->l2_classify.hash); + + vnet_buffer(b1)->l2_classify.hash = + vnet_classify_hash_packet (t1, (u8 *) h1); + + vnet_classify_prefetch_bucket (t1, vnet_buffer(b1)->l2_classify.hash); + + vnet_buffer(b0)->l2_classify.table_index = table_index0; + + vnet_buffer(b1)->l2_classify.table_index = table_index1; + + from += 2; + n_left_from -= 2; + } + + while (n_left_from > 0) + { + vlib_buffer_t * b0; + u32 bi0; + u8 * h0; + u32 sw_if_index0; + u32 table_index0; + vnet_classify_table_t * t0; + + bi0 = from[0]; + b0 = vlib_get_buffer (vm, bi0); + h0 = b0->data; + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + table_index0 = fcm->classify_table_index_by_sw_if_index[tid][sw_if_index0]; + + t0 = pool_elt_at_index (vcm->tables, table_index0); + vnet_buffer(b0)->l2_classify.hash = + vnet_classify_hash_packet (t0, (u8 *) h0); + + vnet_buffer(b0)->l2_classify.table_index = table_index0; + vnet_classify_prefetch_bucket (t0, vnet_buffer(b0)->l2_classify.hash); + + from++; + n_left_from--; + } + + next_index = node->cached_next_index; + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + /* Not enough load/store slots to dual loop... */ + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t * b0; + u32 next0 = FLOW_CLASSIFY_NEXT_INDEX_DROP; + u32 table_index0; + vnet_classify_table_t * t0; + vnet_classify_entry_t * e0; + u64 hash0; + u8 * h0; + + /* Stride 3 seems to work best */ + if (PREDICT_TRUE (n_left_from > 3)) + { + vlib_buffer_t * p1 = vlib_get_buffer(vm, from[3]); + vnet_classify_table_t * tp1; + u32 table_index1; + u64 phash1; + + table_index1 = vnet_buffer(p1)->l2_classify.table_index; + + if (PREDICT_TRUE (table_index1 != ~0)) + { + tp1 = pool_elt_at_index (vcm->tables, table_index1); + phash1 = vnet_buffer(p1)->l2_classify.hash; + vnet_classify_prefetch_entry (tp1, phash1); + } + } + + /* Speculatively enqueue b0 to the current next frame */ + 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 = b0->data; + table_index0 = vnet_buffer(b0)->l2_classify.table_index; + e0 = 0; + t0 = 0; + + vnet_get_config_data (fcm->vnet_config_main[tid], + &b0->current_config_index, + &next0, + /* # bytes of config data */ 0); + + if (PREDICT_TRUE(table_index0 != ~0)) + { + hash0 = vnet_buffer(b0)->l2_classify.hash; + t0 = pool_elt_at_index (vcm->tables, table_index0); + e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now); + if (e0) + { + hits++; + } + else + { + misses++; + vnet_classify_add_del_session (vcm, table_index0, + h0, ~0, 0, 0, 0, 0, 1); + /* increment counter */ + vnet_classify_find_entry (t0, (u8 *) h0, hash0, now); + } + } + if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + flow_classify_trace_t * t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = vnet_buffer(b0)->sw_if_index[VLIB_RX]; + t->next_index = next0; + t->table_index = t0 ? t0 - vcm->tables : ~0; + t->offset = (t0 && e0) ? vnet_classify_get_offset (t0, e0): ~0; + } + + /* Verify speculative enqueue, maybe switch current next frame */ + 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, node->node_index, + FLOW_CLASSIFY_ERROR_MISS, + misses); + vlib_node_increment_counter (vm, node->node_index, + FLOW_CLASSIFY_ERROR_HIT, + hits); + vlib_node_increment_counter (vm, node->node_index, + FLOW_CLASSIFY_ERROR_CHAIN_HIT, + chain_hits); + vlib_node_increment_counter (vm, node->node_index, + FLOW_CLASSIFY_ERROR_DROP, + drop); + + return frame->n_vectors; +} + +static uword +ip4_flow_classify (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return flow_classify_inline(vm, node, frame, FLOW_CLASSIFY_TABLE_IP4); +} + +VLIB_REGISTER_NODE (ip4_flow_classify_node) = { + .function = ip4_flow_classify, + .name = "ip4-flow-classify", + .vector_size = sizeof (u32), + .format_trace = format_flow_classify_trace, + .n_errors = ARRAY_LEN(flow_classify_error_strings), + .error_strings = flow_classify_error_strings, + .n_next_nodes = FLOW_CLASSIFY_NEXT_INDEX_N_NEXT, + .next_nodes = { + [FLOW_CLASSIFY_NEXT_INDEX_DROP] = "error-drop", + }, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (ip4_flow_classify_node, ip4_flow_classify); + +static uword +ip6_flow_classify (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return flow_classify_inline(vm, node, frame, FLOW_CLASSIFY_TABLE_IP6); +} + +VLIB_REGISTER_NODE (ip6_flow_classify_node) = { + .function = ip6_flow_classify, + .name = "ip6-flow-classify", + .vector_size = sizeof (u32), + .format_trace = format_flow_classify_trace, + .n_errors = ARRAY_LEN(flow_classify_error_strings), + .error_strings = flow_classify_error_strings, + .n_next_nodes = FLOW_CLASSIFY_NEXT_INDEX_N_NEXT, + .next_nodes = { + [FLOW_CLASSIFY_NEXT_INDEX_DROP] = "error-drop", + }, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (ip6_flow_classify_node, ip6_flow_classify); + + +static clib_error_t * +flow_classify_init (vlib_main_t *vm) +{ + flow_classify_main_t * fcm = &flow_classify_main; + + fcm->vlib_main = vm; + fcm->vnet_main = vnet_get_main(); + fcm->vnet_classify_main = &vnet_classify_main; + + return 0; +} + +VLIB_INIT_FUNCTION (flow_classify_init); |