/* * Copyright (c) 2015 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/policer/policer.h> #include <vnet/policer/police_inlines.h> #include <vnet/ip/ip.h> #include <vnet/classify/policer_classify.h> #include <vnet/classify/vnet_classify.h> #include <vnet/l2/feat_bitmap.h> #include <vnet/l2/l2_input.h> /* Dispatch functions meant to be instantiated elsewhere */ typedef struct { u32 next_index; u32 sw_if_index; u32 policer_index; } vnet_policer_trace_t; /* packet trace format function */ static u8 * format_policer_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 *); vnet_policer_trace_t *t = va_arg (*args, vnet_policer_trace_t *); s = format (s, "VNET_POLICER: sw_if_index %d policer_index %d next %d", t->sw_if_index, t->policer_index, t->next_index); return s; } #define foreach_vnet_policer_error \ _(TRANSMIT, "Packets Transmitted") \ _(DROP, "Packets Dropped") typedef enum { #define _(sym,str) VNET_POLICER_ERROR_##sym, foreach_vnet_policer_error #undef _ VNET_POLICER_N_ERROR, } vnet_policer_error_t; static char *vnet_policer_error_strings[] = { #define _(sym,string) string, foreach_vnet_policer_error #undef _ }; static inline uword vnet_policer_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, vlib_dir_t dir) { u32 n_left_from, *from, *to_next; vnet_policer_next_t next_index; vnet_policer_main_t *pm = &vnet_policer_main; u64 time_in_policer_periods; u32 transmitted = 0; time_in_policer_periods = clib_cpu_time_now () >> POLICER_TICKS_PER_PERIOD_SHIFT; from = vlib_frame_vector_args (frame); n_left_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) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; u32 next0, next1; u32 sw_if_index0, sw_if_index1; u32 pi0 = 0, pi1 = 0; u8 act0, act1; /* Prefetch next iteration. */ { vlib_buffer_t *b2, *b3; b2 = vlib_get_buffer (vm, from[2]); b3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (b2, LOAD); vlib_prefetch_buffer_header (b3, LOAD); } /* speculatively enqueue b0 and b1 to the current next frame */ to_next[0] = bi0 = from[0]; to_next[1] = bi1 = 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); sw_if_index0 = vnet_buffer (b0)->sw_if_index[dir]; sw_if_index1 = vnet_buffer (b1)->sw_if_index[dir]; pi0 = pm->policer_index_by_sw_if_index[dir][sw_if_index0]; pi1 = pm->policer_index_by_sw_if_index[dir][sw_if_index1]; act0 = vnet_policer_police (vm, b0, pi0, time_in_policer_periods, POLICE_CONFORM /* no chaining */, true); act1 = vnet_policer_police (vm, b1, pi1, time_in_policer_periods, POLICE_CONFORM /* no chaining */, true); if (PREDICT_FALSE (act0 == QOS_ACTION_HANDOFF)) { next0 = VNET_POLICER_NEXT_HANDOFF; vnet_buffer (b0)->policer.index = pi0; } else if (PREDICT_FALSE (act0 == QOS_ACTION_DROP)) { next0 = VNET_POLICER_NEXT_DROP; b0->error = node->errors[VNET_POLICER_ERROR_DROP]; } else /* transmit or mark-and-transmit action */ { transmitted++; vnet_feature_next (&next0, b0); } if (PREDICT_FALSE (act1 == QOS_ACTION_HANDOFF)) { next1 = VNET_POLICER_NEXT_HANDOFF; vnet_buffer (b1)->policer.index = pi1; } else if (PREDICT_FALSE (act1 == QOS_ACTION_DROP)) /* drop action */ { next1 = VNET_POLICER_NEXT_DROP; b1->error = node->errors[VNET_POLICER_ERROR_DROP]; } else /* transmit or mark-and-transmit action */ { transmitted++; vnet_feature_next (&next1, b1); } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) { if (b0->flags & VLIB_BUFFER_IS_TRACED) { vnet_policer_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = sw_if_index0; t->next_index = next0; } if (b1->flags & VLIB_BUFFER_IS_TRACED) { vnet_policer_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); t->sw_if_index = sw_if_index1; t->next_index = next1; } } /* verify speculative enqueues, maybe switch current next frame */ 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 bi0; vlib_buffer_t *b0; u32 next0; u32 sw_if_index0; u32 pi0 = 0; u8 act0; 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); sw_if_index0 = vnet_buffer (b0)->sw_if_index[dir]; pi0 = pm->policer_index_by_sw_if_index[dir][sw_if_index0]; act0 = vnet_policer_police (vm, b0, pi0, time_in_policer_periods, POLICE_CONFORM /* no chaining */, true); if (PREDICT_FALSE (act0 == QOS_ACTION_HANDOFF)) { next0 = VNET_POLICER_NEXT_HANDOFF; vnet_buffer (b0)->policer.index = pi0; } else if (PREDICT_FALSE (act0 == QOS_ACTION_DROP)) { next0 = VNET_POLICER_NEXT_DROP; b0->error = node->errors[VNET_POLICER_ERROR_DROP]; } else /* transmit or mark-and-transmit action */ { transmitted++; vnet_feature_next (&next0, b0); } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { vnet_policer_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = sw_if_index0; t->next_index = next0; t->policer_index = pi0; } /* 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, VNET_POLICER_ERROR_TRANSMIT, transmitted); return frame->n_vectors; } VLIB_NODE_FN (policer_input_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return vnet_policer_inline (vm, node, frame, VLIB_RX); } VLIB_REGISTER_NODE (policer_input_node) = { .name = "policer-input", .vector_size = sizeof (u32), .format_trace = format_policer_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(vnet_policer_error_strings), .error_strings = vnet_policer_error_strings, .n_next_nodes = VNET_POLICER_N_NEXT, .next_nodes = { [VNET_POLICER_NEXT_DROP] = "error-drop", [VNET_POLICER_NEXT_HANDOFF] = "policer-input-handoff", }, }; VNET_FEATURE_INIT (policer_input_node, static) = { .arc_name = "device-input", .node_name = "policer-input", .runs_before = VNET_FEATURES ("ethernet-input"), }; VLIB_NODE_FN (policer_output_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return vnet_policer_inline (vm, node, frame, VLIB_TX); } VLIB_REGISTER_NODE (policer_output_node) = { .name = "policer-output", .vector_size = sizeof (u32), .format_trace = format_policer_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(vnet_policer_error_strings), .error_strings = vnet_policer_error_strings, .n_next_nodes = VNET_POLICER_N_NEXT, .next_nodes = { [VNET_POLICER_NEXT_DROP] = "error-drop", [VNET_POLICER_NEXT_HANDOFF] = "policer-output-handoff", }, }; VNET_FEATURE_INIT (policer_output_node, static) = { .arc_name = "ip4-output", .node_name = "policer-output", }; VNET_FEATURE_INIT (policer6_output_node, static) = { .arc_name = "ip6-output", .node_name = "policer-output", }; static char *policer_input_handoff_error_strings[] = { "congestion drop" }; VLIB_NODE_FN (policer_input_handoff_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return policer_handoff (vm, node, frame, vnet_policer_main.fq_index[VLIB_RX], ~0); } VLIB_REGISTER_NODE (policer_input_handoff_node) = { .name = "policer-input-handoff", .vector_size = sizeof (u32), .format_trace = format_policer_handoff_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(policer_input_handoff_error_strings), .error_strings = policer_input_handoff_error_strings, .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", }, }; VLIB_NODE_FN (policer_output_handoff_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return policer_handoff (vm, node, frame, vnet_policer_main.fq_index[VLIB_TX], ~0); } VLIB_REGISTER_NODE (policer_output_handoff_node) = { .name = "policer-output-handoff", .vector_size = sizeof (u32), .format_trace = format_policer_handoff_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(policer_input_handoff_error_strings), .error_strings = policer_input_handoff_error_strings, .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", }, }; typedef struct { u32 sw_if_index; u32 next_index; u32 table_index; u32 offset; u32 policer_index; } policer_classify_trace_t; static u8 * format_policer_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 *); policer_classify_trace_t *t = va_arg (*args, policer_classify_trace_t *); s = format (s, "POLICER_CLASSIFY: sw_if_index %d next %d table %d offset %d" " policer_index %d", t->sw_if_index, t->next_index, t->table_index, t->offset, t->policer_index); return s; } #define foreach_policer_classify_error \ _(MISS, "Policer classify misses") \ _(HIT, "Policer classify hits") \ _(CHAIN_HIT, "Policer classify hits after chain walk") \ _(DROP, "Policer classify action drop") typedef enum { #define _(sym,str) POLICER_CLASSIFY_ERROR_##sym, foreach_policer_classify_error #undef _ POLICER_CLASSIFY_N_ERROR, } policer_classify_error_t; static char *policer_classify_error_strings[] = { #define _(sym,string) string, foreach_policer_classify_error #undef _ }; static inline uword policer_classify_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, policer_classify_table_id_t tid) { u32 n_left_from, *from, *to_next; policer_classify_next_index_t next_index; policer_classify_main_t *pcm = &policer_classify_main; vnet_classify_main_t *vcm = pcm->vnet_classify_main; f64 now = vlib_time_now (vm); u32 hits = 0; u32 misses = 0; u32 chain_hits = 0; u32 n_next_nodes; u64 time_in_policer_periods; time_in_policer_periods = clib_cpu_time_now () >> POLICER_TICKS_PER_PERIOD_SHIFT; n_next_nodes = node->n_next_nodes; 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_store (p1->data); vlib_prefetch_buffer_header (p2, STORE); clib_prefetch_store (p2->data); } 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 = pcm->classify_table_index_by_sw_if_index[tid][sw_if_index0]; sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; table_index1 = pcm->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 = pcm->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 = POLICER_CLASSIFY_NEXT_INDEX_DROP; u32 table_index0; vnet_classify_table_t *t0; vnet_classify_entry_t *e0; u32 hash0; u8 *h0; u8 act0; /* 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; u32 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; if (tid == POLICER_CLASSIFY_TABLE_L2) { /* Feature bitmap update and determine the next node */ next0 = vnet_l2_feature_next (b0, pcm->feat_next_node_index, L2INPUT_FEAT_POLICER_CLAS); } else vnet_get_config_data (pcm->vnet_config_main[tid], &b0->current_config_index, &next0, /* # bytes of config data */ 0); vnet_buffer (b0)->l2_classify.opaque_index = ~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) { act0 = vnet_policer_police (vm, b0, e0->next_index, time_in_policer_periods, e0->opaque_index, false); if (PREDICT_FALSE (act0 == QOS_ACTION_DROP)) { next0 = POLICER_CLASSIFY_NEXT_INDEX_DROP; b0->error = node->errors[POLICER_CLASSIFY_ERROR_DROP]; } hits++; } else { while (1) { if (PREDICT_TRUE (t0->next_table_index != ~0)) { t0 = pool_elt_at_index (vcm->tables, t0->next_table_index); } else { next0 = (t0->miss_next_index < n_next_nodes) ? t0->miss_next_index : next0; misses++; break; } hash0 = vnet_classify_hash_packet (t0, (u8 *) h0); e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now); if (e0) { act0 = vnet_policer_police (vm, b0, e0->next_index, time_in_policer_periods, e0->opaque_index, false); if (PREDICT_FALSE (act0 == QOS_ACTION_DROP)) { next0 = POLICER_CLASSIFY_NEXT_INDEX_DROP; b0->error = node->errors[POLICER_CLASSIFY_ERROR_DROP]; } hits++; chain_hits++; break; } } } } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { policer_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 = (e0 && t0) ? vnet_classify_get_offset (t0, e0) : ~0; t->policer_index = e0 ? e0->next_index : ~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, POLICER_CLASSIFY_ERROR_MISS, misses); vlib_node_increment_counter (vm, node->node_index, POLICER_CLASSIFY_ERROR_HIT, hits); vlib_node_increment_counter (vm, node->node_index, POLICER_CLASSIFY_ERROR_CHAIN_HIT, chain_hits); return frame->n_vectors; } VLIB_NODE_FN (ip4_policer_classify_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return policer_classify_inline (vm, node, frame, POLICER_CLASSIFY_TABLE_IP4); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip4_policer_classify_node) = { .name = "ip4-policer-classify", .vector_size = sizeof (u32), .format_trace = format_policer_classify_trace, .n_errors = ARRAY_LEN(policer_classify_error_strings), .error_strings = policer_classify_error_strings, .n_next_nodes = POLICER_CLASSIFY_NEXT_INDEX_N_NEXT, .next_nodes = { [POLICER_CLASSIFY_NEXT_INDEX_DROP] = "error-drop", }, }; /* *INDENT-ON* */ VLIB_NODE_FN (ip6_policer_classify_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return policer_classify_inline (vm, node, frame, POLICER_CLASSIFY_TABLE_IP6); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_policer_classify_node) = { .name = "ip6-policer-classify", .vector_size = sizeof (u32), .format_trace = format_policer_classify_trace, .n_errors = ARRAY_LEN(policer_classify_error_strings), .error_strings = policer_classify_error_strings, .n_next_nodes = POLICER_CLASSIFY_NEXT_INDEX_N_NEXT, .next_nodes = { [POLICER_CLASSIFY_NEXT_INDEX_DROP] = "error-drop", }, }; /* *INDENT-ON* */ VLIB_NODE_FN (l2_policer_classify_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return policer_classify_inline (vm, node, frame, POLICER_CLASSIFY_TABLE_L2); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (l2_policer_classify_node) = { .name = "l2-policer-classify", .vector_size = sizeof (u32), .format_trace = format_policer_classify_trace, .n_errors = ARRAY_LEN (policer_classify_error_strings), .error_strings = policer_classify_error_strings, .n_next_nodes = POLICER_CLASSIFY_NEXT_INDEX_N_NEXT, .next_nodes = { [POLICER_CLASSIFY_NEXT_INDEX_DROP] = "error-drop", }, }; /* *INDENT-ON* */ #ifndef CLIB_MARCH_VARIANT static clib_error_t * policer_classify_init (vlib_main_t * vm) { policer_classify_main_t *pcm = &policer_classify_main; pcm->vlib_main = vm; pcm->vnet_main = vnet_get_main (); pcm->vnet_classify_main = &vnet_classify_main; /* Initialize L2 feature next-node indexes */ feat_bitmap_init_next_nodes (vm, l2_policer_classify_node.index, L2INPUT_N_FEAT, l2input_get_feat_names (), pcm->feat_next_node_index); return 0; } VLIB_INIT_FUNCTION (policer_classify_init); #endif /* CLIB_MARCH_VARIANT */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */