/* * 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);