diff options
Diffstat (limited to 'vnet/vnet/l2/l2_classify.c')
| -rw-r--r-- | vnet/vnet/l2/l2_classify.c | 551 |
1 files changed, 551 insertions, 0 deletions
diff --git a/vnet/vnet/l2/l2_classify.c b/vnet/vnet/l2/l2_classify.c new file mode 100644 index 00000000000..a6c8ebbc1b4 --- /dev/null +++ b/vnet/vnet/l2/l2_classify.c @@ -0,0 +1,551 @@ +/* + * 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. + */ +/* + * l2_classify.c + */ + +#include <vnet/l2/l2_classify.h> +#include <vnet/api_errno.h> + +typedef struct { + /* per-pkt trace data */ + u32 sw_if_index; + u32 next_index; + u32 table_index; + u32 session_offset; +} l2_classify_trace_t; + +typedef struct { + vnet_classify_main_t * vcm; + l2_classify_main_t * l2cm; +} l2_classify_runtime_t; + +/* packet trace format function */ +static u8 * format_l2_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 *); + l2_classify_trace_t * t = va_arg (*args, l2_classify_trace_t *); + + s = format (s, "l2-classify: sw_if_index %d, table %d, offset %x, next %d", + t->sw_if_index, t->table_index, t->session_offset, t->next_index); + return s; +} + +l2_classify_main_t l2_classify_main; + +vlib_node_registration_t l2_classify_node; + +#define foreach_l2_classify_error \ +_(MISS, "Classify misses") \ +_(HIT, "Classify hits") \ +_(CHAIN_HIT, "Classify hits after chain walk") \ +_(DROP, "L2 Classify Drops") + +typedef enum { +#define _(sym,str) L2_CLASSIFY_ERROR_##sym, + foreach_l2_classify_error +#undef _ + L2_CLASSIFY_N_ERROR, +} l2_classify_error_t; + +static char * l2_classify_error_strings[] = { +#define _(sym,string) string, + foreach_l2_classify_error +#undef _ +}; + +static uword +l2_classify_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, * from, * to_next; + l2_classify_next_t next_index; + l2_classify_main_t * cm = &l2_classify_main; + vnet_classify_main_t * vcm = cm->vnet_classify_main; + l2_classify_runtime_t * rt = (l2_classify_runtime_t *)node->runtime_data; + u32 feature_bitmap; + u32 hits = 0; + u32 misses = 0; + u32 chain_hits = 0; + f64 now; + + now = vlib_time_now(vm); + + n_left_from = frame->n_vectors; + from = vlib_frame_vector_args (frame); + + /* First pass: compute hash */ + + while (n_left_from > 2) + { + vlib_buffer_t * b0, * b1; + u32 bi0, bi1; + ethernet_header_t * h0, * h1; + u32 sw_if_index0, sw_if_index1; + u16 type0, type1; + int type_index0, type_index1; + vnet_classify_table_t * t0, * t1; + u32 table_index0, table_index1; + u64 hash0, hash1; + + + /* 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 = vlib_buffer_get_current (b0); + + bi1 = from[1]; + b1 = vlib_get_buffer (vm, bi1); + h1 = vlib_buffer_get_current (b1); + + sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; + vnet_buffer(b0)->l2_classify.table_index = ~0; + + sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX]; + vnet_buffer(b1)->l2_classify.table_index = ~0; + + /* Select classifier table based on ethertype */ + type0 = clib_net_to_host_u16 (h0->type); + type1 = clib_net_to_host_u16 (h1->type); + + type_index0 = (type0 == ETHERNET_TYPE_IP4) + ? L2_CLASSIFY_TABLE_IP4 : L2_CLASSIFY_TABLE_OTHER; + type_index0 = (type0 == ETHERNET_TYPE_IP6) + ? L2_CLASSIFY_TABLE_IP6 : type_index0; + + type_index1 = (type1 == ETHERNET_TYPE_IP4) + ? L2_CLASSIFY_TABLE_IP4 : L2_CLASSIFY_TABLE_OTHER; + type_index1 = (type1 == ETHERNET_TYPE_IP6) + ? L2_CLASSIFY_TABLE_IP6 : type_index1; + + vnet_buffer(b0)->l2_classify.table_index = + table_index0 = + rt->l2cm->classify_table_index_by_sw_if_index + [type_index0][sw_if_index0]; + + if (table_index0 != ~0) + { + t0 = pool_elt_at_index (vcm->tables, table_index0); + + vnet_buffer(b0)->l2_classify.hash = hash0 = + vnet_classify_hash_packet (t0, (u8 *) h0); + vnet_classify_prefetch_bucket (t0, hash0); + } + + vnet_buffer(b1)->l2_classify.table_index = + table_index1 = + rt->l2cm->classify_table_index_by_sw_if_index + [type_index1][sw_if_index1]; + + if (table_index1 != ~0) + { + t1 = pool_elt_at_index (vcm->tables, table_index1); + + vnet_buffer(b1)->l2_classify.hash = hash1 = + vnet_classify_hash_packet (t1, (u8 *) h1); + vnet_classify_prefetch_bucket (t1, hash1); + } + + from += 2; + n_left_from -= 2; + } + + while (n_left_from > 0) + { + vlib_buffer_t * b0; + u32 bi0; + ethernet_header_t * h0; + u32 sw_if_index0; + u16 type0; + u32 type_index0; + vnet_classify_table_t * t0; + u32 table_index0; + u64 hash0; + + bi0 = from[0]; + b0 = vlib_get_buffer (vm, bi0); + h0 = vlib_buffer_get_current (b0); + + sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; + vnet_buffer(b0)->l2_classify.table_index = ~0; + + /* Select classifier table based on ethertype */ + type0 = clib_net_to_host_u16 (h0->type); + + type_index0 = (type0 == ETHERNET_TYPE_IP4) + ? L2_CLASSIFY_TABLE_IP4 : L2_CLASSIFY_TABLE_OTHER; + type_index0 = (type0 == ETHERNET_TYPE_IP6) + ? L2_CLASSIFY_TABLE_IP6 : type_index0; + + vnet_buffer(b0)->l2_classify.table_index = + table_index0 = rt->l2cm->classify_table_index_by_sw_if_index + [type_index0][sw_if_index0]; + + if (table_index0 != ~0) + { + t0 = pool_elt_at_index (vcm->tables, table_index0); + + vnet_buffer(b0)->l2_classify.hash = hash0 = + vnet_classify_hash_packet (t0, (u8 *) h0); + vnet_classify_prefetch_bucket (t0, hash0); + } + 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 = L2_CLASSIFY_NEXT_ETHERNET_INPUT; + ethernet_header_t * h0; + u32 table_index0; + u64 hash0; + vnet_classify_table_t * t0; + vnet_classify_entry_t * e0; + + if (PREDICT_TRUE (n_left_from > 2)) + { + vlib_buffer_t * p2 = vlib_get_buffer(vm, from[2]); + u64 phash2; + u32 table_index2; + vnet_classify_table_t * tp2; + + /* + * Prefetch table entry two ahead. Buffer / data + * were prefetched above... + */ + table_index2 = vnet_buffer(p2)->l2_classify.table_index; + + if (PREDICT_TRUE (table_index2 != ~0)) + { + tp2 = pool_elt_at_index (vcm->tables, table_index2); + phash2 = vnet_buffer(p2)->l2_classify.hash; + vnet_classify_prefetch_entry (tp2, phash2); + } + } + + /* 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 = vlib_buffer_get_current(b0); + table_index0 = vnet_buffer(b0)->l2_classify.table_index; + e0 = 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 < L2_CLASSIFY_N_NEXT)? + 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 < L2_CLASSIFY_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 < L2_CLASSIFY_N_NEXT)? + e0->next_index:next0; + hits++; + chain_hits++; + break; + } + } + } + } + + if (PREDICT_FALSE(next0 == 0)) + b0->error = node->errors[L2_CLASSIFY_ERROR_DROP]; + + if (PREDICT_FALSE (next0 == ~0)) + { + + // Remove ourself from the feature bitmap + feature_bitmap = vnet_buffer(b0)->l2.feature_bitmap + & ~L2INPUT_FEAT_CLASSIFY; + + // save for next feature graph nodes + vnet_buffer(b0)->l2.feature_bitmap = feature_bitmap; + + // Determine the next node + next0 = feat_bitmap_get_next_node_index(cm->feat_next_node_index, + feature_bitmap); + } + + if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + l2_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->table_index = table_index0; + t->next_index = next0; + t->session_offset = 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, + L2_CLASSIFY_ERROR_MISS, + misses); + vlib_node_increment_counter (vm, node->node_index, + L2_CLASSIFY_ERROR_HIT, + hits); + vlib_node_increment_counter (vm, node->node_index, + L2_CLASSIFY_ERROR_CHAIN_HIT, + chain_hits); + return frame->n_vectors; +} + +VLIB_REGISTER_NODE (l2_classify_node) = { + .function = l2_classify_node_fn, + .name = "l2-classify", + .vector_size = sizeof (u32), + .format_trace = format_l2_classify_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(l2_classify_error_strings), + .error_strings = l2_classify_error_strings, + + .runtime_data_bytes = sizeof (l2_classify_runtime_t), + + .n_next_nodes = L2_CLASSIFY_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [L2_CLASSIFY_NEXT_DROP] = "error-drop", + [L2_CLASSIFY_NEXT_ETHERNET_INPUT] = "ethernet-input-not-l2", + [L2_CLASSIFY_NEXT_IP4_INPUT] = "ip4-input", + [L2_CLASSIFY_NEXT_IP6_INPUT] = "ip6-input", + [L2_CLASSIFY_NEXT_LI] = "li-hit", + }, +}; + +clib_error_t *l2_classify_init (vlib_main_t *vm) +{ + l2_classify_main_t * cm = &l2_classify_main; + l2_classify_runtime_t * rt; + + rt = vlib_node_get_runtime_data (vm, l2_classify_node.index); + + cm->vlib_main = vm; + cm->vnet_main = vnet_get_main(); + cm->vnet_classify_main = &vnet_classify_main; + + // Initialize the feature next-node indexes + feat_bitmap_init_next_nodes(vm, + l2_classify_node.index, + L2INPUT_N_FEAT, + l2input_get_feat_names(), + cm->feat_next_node_index); + rt->l2cm = cm; + rt->vcm = cm->vnet_classify_main; + + return 0; +} + +VLIB_INIT_FUNCTION (l2_classify_init); + + +void vnet_l2_classify_enable_disable (u32 sw_if_index, + int enable_disable) +{ + vlib_main_t * vm = vlib_get_main(); + vnet_main_t * vnm = vnet_get_main(); + + if (enable_disable) + set_int_l2_mode (vm, vnm, MODE_L2_CLASSIFY, sw_if_index, + 0, 0, 0, 0); + else + set_int_l2_mode (vm, vnm, MODE_L3, sw_if_index, + 0, 0, 0, 0); +} + +int vnet_l2_classify_set_tables (u32 sw_if_index, + u32 ip4_table_index, + u32 ip6_table_index, + u32 other_table_index) +{ + l2_classify_main_t * cm = &l2_classify_main; + vnet_classify_main_t * vcm = cm->vnet_classify_main; + + /* Assume that we've validated sw_if_index in the API layer */ + + if (ip4_table_index != ~0 && + pool_is_free_index (vcm->tables, ip4_table_index)) + return VNET_API_ERROR_NO_SUCH_TABLE; + + if (ip6_table_index != ~0 && + pool_is_free_index (vcm->tables, ip6_table_index)) + return VNET_API_ERROR_NO_SUCH_TABLE2; + + if (other_table_index != ~0 && + pool_is_free_index (vcm->tables, other_table_index)) + return VNET_API_ERROR_NO_SUCH_TABLE3; + + vec_validate + (cm->classify_table_index_by_sw_if_index[L2_CLASSIFY_TABLE_IP4], + sw_if_index); + + vec_validate + (cm->classify_table_index_by_sw_if_index[L2_CLASSIFY_TABLE_IP6], + sw_if_index); + + vec_validate + (cm->classify_table_index_by_sw_if_index[L2_CLASSIFY_TABLE_OTHER], + sw_if_index); + + cm->classify_table_index_by_sw_if_index[L2_CLASSIFY_TABLE_IP4] + [sw_if_index] = ip4_table_index; + + cm->classify_table_index_by_sw_if_index[L2_CLASSIFY_TABLE_IP6] + [sw_if_index] = ip6_table_index; + + cm->classify_table_index_by_sw_if_index[L2_CLASSIFY_TABLE_OTHER] + [sw_if_index] = other_table_index; + + return 0; +} + +static clib_error_t * +int_l2_classify_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + vnet_main_t * vnm = vnet_get_main(); + u32 sw_if_index = ~0; + u32 ip4_table_index = ~0; + u32 ip6_table_index = ~0; + u32 other_table_index = ~0; + int rv; + + while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "intfc %U", unformat_vnet_sw_interface, + vnm, &sw_if_index)) + ; + else if (unformat (input, "ip4-table %d", &ip4_table_index)) + ; + else if (unformat (input, "ip6-table %d", &ip6_table_index)) + ; + else if (unformat (input, "other-table %d", &other_table_index)) + ; + else + break; + } + + if (sw_if_index == ~0) + return clib_error_return (0, "interface must be specified"); + + + if (ip4_table_index == ~0 && ip6_table_index == ~0 + && other_table_index == ~0) + { + vlib_cli_output (vm, "L2 classification disabled"); + vnet_l2_classify_enable_disable (sw_if_index, 0 /* enable */); + return 0; + } + + rv = vnet_l2_classify_set_tables (sw_if_index, ip4_table_index, + ip6_table_index, other_table_index); + switch(rv) + { + case 0: + vnet_l2_classify_enable_disable (sw_if_index, 1 /* enable */); + break; + + default: + return clib_error_return (0, "vnet_l2_classify_set_tables: %d", + rv); + break; + } + + return 0; +} + +VLIB_CLI_COMMAND (int_l2_classify_cli, static) = { + .path = "set interface l2 classify", + .short_help = + "set interface l2 classify intfc <int> [ip4-table <n>]\n" + " [ip6-table <n>] [other-table <n>]", + .function = int_l2_classify_command_fn, +}; + + |