diff options
Diffstat (limited to 'src/vnet/classify/ip_classify.c')
| -rw-r--r-- | src/vnet/classify/ip_classify.c | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/src/vnet/classify/ip_classify.c b/src/vnet/classify/ip_classify.c new file mode 100644 index 00000000..44973ae5 --- /dev/null +++ b/src/vnet/classify/ip_classify.c @@ -0,0 +1,365 @@ +/* + * 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 <vnet/ip/ip.h> +#include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */ +#include <vnet/classify/vnet_classify.h> +#include <vnet/dpo/classify_dpo.h> + +typedef struct { + u32 next_index; + u32 table_index; + u32 entry_index; +} ip_classify_trace_t; + +/* packet trace format function */ +static u8 * format_ip_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 *); + ip_classify_trace_t * t = va_arg (*args, ip_classify_trace_t *); + + s = format (s, "IP_CLASSIFY: next_index %d, table %d, entry %d", + t->next_index, t->table_index, t->entry_index); + return s; +} + +vlib_node_registration_t ip4_classify_node; +vlib_node_registration_t ip6_classify_node; + +#define foreach_ip_classify_error \ +_(MISS, "Classify misses") \ +_(HIT, "Classify hits") \ +_(CHAIN_HIT, "Classify hits after chain walk") + +typedef enum { +#define _(sym,str) IP_CLASSIFY_ERROR_##sym, + foreach_ip_classify_error +#undef _ + IP_CLASSIFY_N_ERROR, +} ip_classify_error_t; + +static char * ip_classify_error_strings[] = { +#define _(sym,string) string, + foreach_ip_classify_error +#undef _ +}; + +static inline uword +ip_classify_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, int is_ip4) +{ + u32 n_left_from, * from, * to_next; + ip_lookup_next_t next_index; + vnet_classify_main_t * vcm = &vnet_classify_main; + f64 now = vlib_time_now (vm); + u32 hits = 0; + u32 misses = 0; + u32 chain_hits = 0; + u32 n_next; + + if (is_ip4) { + n_next = IP4_LOOKUP_N_NEXT; + } else { + n_next = IP6_LOOKUP_N_NEXT; + } + + 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 cd_index0, cd_index1; + classify_dpo_t *cd0, * cd1; + 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 = (void *)vlib_buffer_get_current(b0) - + ethernet_buffer_header_size(b0); + + bi1 = from[1]; + b1 = vlib_get_buffer (vm, bi1); + h1 = (void *)vlib_buffer_get_current(b1) - + ethernet_buffer_header_size(b1); + + cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX]; + cd0 = classify_dpo_get(cd_index0); + table_index0 = cd0->cd_table_index; + + cd_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX]; + cd1 = classify_dpo_get(cd_index1); + table_index1 = cd1->cd_table_index; + + 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 cd_index0; + classify_dpo_t *cd0; + u32 table_index0; + vnet_classify_table_t * t0; + + bi0 = from[0]; + b0 = vlib_get_buffer (vm, bi0); + h0 = (void *)vlib_buffer_get_current(b0) - + ethernet_buffer_header_size(b0); + + cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX]; + cd0 = classify_dpo_get(cd_index0); + table_index0 = cd0->cd_table_index; + + 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 = IP_LOOKUP_NEXT_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_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) + { + vnet_buffer(b0)->l2_classify.opaque_index + = e0->opaque_index; + vlib_buffer_advance (b0, e0->advance); + next0 = (e0->next_index < node->n_next_nodes)? + e0->next_index:next0; + hits++; + } + else + { + while (1) + { + if (t0->next_table_index != ~0) + t0 = pool_elt_at_index (vcm->tables, + t0->next_table_index); + else + { + next0 = (t0->miss_next_index < n_next) ? + 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) + { + vnet_buffer(b0)->l2_classify.opaque_index + = e0->opaque_index; + vlib_buffer_advance (b0, e0->advance); + next0 = (e0->next_index < node->n_next_nodes)? + e0->next_index:next0; + hits++; + chain_hits++; + break; + } + } + } + } + + if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + ip_classify_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->next_index = next0; + t->table_index = t0 ? t0 - vcm->tables : ~0; + t->entry_index = e0 ? e0 - t0->entries : ~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, + IP_CLASSIFY_ERROR_MISS, + misses); + vlib_node_increment_counter (vm, node->node_index, + IP_CLASSIFY_ERROR_HIT, + hits); + vlib_node_increment_counter (vm, node->node_index, + IP_CLASSIFY_ERROR_CHAIN_HIT, + chain_hits); + return frame->n_vectors; +} + +static uword +ip4_classify (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip_classify_inline (vm, node, frame, 1 /* is_ip4 */); +} + + +VLIB_REGISTER_NODE (ip4_classify_node) = { + .function = ip4_classify, + .name = "ip4-classify", + .vector_size = sizeof (u32), + .sibling_of = "ip4-lookup", + .format_trace = format_ip_classify_trace, + .n_errors = ARRAY_LEN(ip_classify_error_strings), + .error_strings = ip_classify_error_strings, + + .n_next_nodes = 0, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (ip4_classify_node, ip4_classify) + +static uword +ip6_classify (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip_classify_inline (vm, node, frame, 0 /* is_ip4 */); +} + + +VLIB_REGISTER_NODE (ip6_classify_node) = { + .function = ip6_classify, + .name = "ip6-classify", + .vector_size = sizeof (u32), + .sibling_of = "ip6-lookup", + .format_trace = format_ip_classify_trace, + .n_errors = ARRAY_LEN(ip_classify_error_strings), + .error_strings = ip_classify_error_strings, + + .n_next_nodes = 0, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (ip6_classify_node, ip6_classify) + +static clib_error_t * +ip_classify_init (vlib_main_t * vm) +{ + return 0; +} + +VLIB_INIT_FUNCTION (ip_classify_init); |