diff options
Diffstat (limited to 'vnet/vnet/l2/l2_learn.c')
| -rw-r--r-- | vnet/vnet/l2/l2_learn.c | 597 |
1 files changed, 0 insertions, 597 deletions
diff --git a/vnet/vnet/l2/l2_learn.c b/vnet/vnet/l2/l2_learn.c deleted file mode 100644 index 7f19f936d70..00000000000 --- a/vnet/vnet/l2/l2_learn.c +++ /dev/null @@ -1,597 +0,0 @@ -/* - * l2_learn.c : layer 2 learning using l2fib - * - * Copyright (c) 2013 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 <vlib/vlib.h> -#include <vnet/vnet.h> -#include <vnet/pg/pg.h> -#include <vnet/ethernet/ethernet.h> -#include <vlib/cli.h> - -#include <vnet/l2/l2_input.h> -#include <vnet/l2/feat_bitmap.h> -#include <vnet/l2/l2_fib.h> -#include <vnet/l2/l2_learn.h> - -#include <vppinfra/error.h> -#include <vppinfra/hash.h> - -/** - * @file - * @brief Ethernet Bridge Learning. - * - * Populate the mac table with entries mapping the packet's source mac + bridge - * domain ID to the input sw_if_index. - * - * Note that learning and forwarding are separate graph nodes. This means that - * for a set of packets, all learning is performed first, then all nodes are - * forwarded. The forwarding is done based on the end-state of the mac table, - * instead of the state after each packet. Thus the forwarding results could - * differ in certain cases (mac move tests), but this not expected to cause - * problems in real-world networks. It is much simpler to separate learning - * and forwarding into separate nodes. - */ - - -typedef struct -{ - u8 src[6]; - u8 dst[6]; - u32 sw_if_index; - u16 bd_index; -} l2learn_trace_t; - - -/* packet trace format function */ -static u8 * -format_l2learn_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 *); - l2learn_trace_t *t = va_arg (*args, l2learn_trace_t *); - - s = format (s, "l2-learn: sw_if_index %d dst %U src %U bd_index %d", - t->sw_if_index, - format_ethernet_address, t->dst, - format_ethernet_address, t->src, t->bd_index); - return s; -} - -static vlib_node_registration_t l2learn_node; - -#define foreach_l2learn_error \ -_(L2LEARN, "L2 learn packets") \ -_(MISS, "L2 learn misses") \ -_(MAC_MOVE, "L2 mac moves") \ -_(MAC_MOVE_VIOLATE, "L2 mac move violations") \ -_(LIMIT, "L2 not learned due to limit") \ -_(HIT, "L2 learn hits") \ -_(FILTER_DROP, "L2 filter mac drops") - -typedef enum -{ -#define _(sym,str) L2LEARN_ERROR_##sym, - foreach_l2learn_error -#undef _ - L2LEARN_N_ERROR, -} l2learn_error_t; - -static char *l2learn_error_strings[] = { -#define _(sym,string) string, - foreach_l2learn_error -#undef _ -}; - -typedef enum -{ - L2LEARN_NEXT_L2FWD, - L2LEARN_NEXT_DROP, - L2LEARN_N_NEXT, -} l2learn_next_t; - - -/** Perform learning on one packet based on the mac table lookup result. */ - -static_always_inline void -l2learn_process (vlib_node_runtime_t * node, - l2learn_main_t * msm, - u64 * counter_base, - vlib_buffer_t * b0, - u32 sw_if_index0, - l2fib_entry_key_t * key0, - l2fib_entry_key_t * cached_key, - u32 * bucket0, - l2fib_entry_result_t * result0, u32 * next0, u8 timestamp) -{ - u32 feature_bitmap; - - /* Set up the default next node (typically L2FWD) */ - - /* Remove ourself from the feature bitmap */ - feature_bitmap = vnet_buffer (b0)->l2.feature_bitmap & ~L2INPUT_FEAT_LEARN; - - /* 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 (msm->feat_next_node_index, - feature_bitmap); - - /* Check mac table lookup result */ - - if (PREDICT_TRUE (result0->fields.sw_if_index == sw_if_index0)) - { - /* - * The entry was in the table, and the sw_if_index matched, the normal case - */ - counter_base[L2LEARN_ERROR_HIT] += 1; - if (PREDICT_FALSE (result0->fields.timestamp != timestamp)) - result0->fields.timestamp = timestamp; - - } - else if (result0->raw == ~0) - { - - /* The entry was not in table, so add it */ - - counter_base[L2LEARN_ERROR_MISS] += 1; - - if (msm->global_learn_count == msm->global_learn_limit) - { - /* - * Global limit reached. Do not learn the mac but forward the packet. - * In the future, limits could also be per-interface or bridge-domain. - */ - counter_base[L2LEARN_ERROR_LIMIT] += 1; - goto done; - - } - else - { - BVT (clib_bihash_kv) kv; - /* It is ok to learn */ - - result0->raw = 0; /* clear all fields */ - result0->fields.sw_if_index = sw_if_index0; - result0->fields.timestamp = timestamp; - kv.key = key0->raw; - kv.value = result0->raw; - - BV (clib_bihash_add_del) (msm->mac_table, &kv, 1 /* is_add */ ); - - cached_key->raw = ~0; /* invalidate the cache */ - msm->global_learn_count++; - } - - } - else - { - - /* The entry was in the table, but with the wrong sw_if_index mapping (mac move) */ - counter_base[L2LEARN_ERROR_MAC_MOVE] += 1; - - if (result0->fields.static_mac) - { - /* - * Don't overwrite a static mac - * TODO: Check violation policy. For now drop the packet - */ - b0->error = node->errors[L2LEARN_ERROR_MAC_MOVE_VIOLATE]; - *next0 = L2LEARN_NEXT_DROP; - } - else - { - /* - * Update the entry - * TODO: may want to rate limit mac moves - * TODO: check global/bridge domain/interface learn limits - */ - BVT (clib_bihash_kv) kv; - - result0->raw = 0; /* clear all fields */ - result0->fields.sw_if_index = sw_if_index0; - result0->fields.timestamp = timestamp; - - kv.key = key0->raw; - kv.value = result0->raw; - - cached_key->raw = ~0; /* invalidate the cache */ - - BV (clib_bihash_add_del) (msm->mac_table, &kv, 1 /* is_add */ ); - } - } - - if (result0->fields.filter) - { - /* drop packet because lookup matched a filter mac entry */ - - if (*next0 != L2LEARN_NEXT_DROP) - { - /* if we're not already dropping the packet, do it now */ - b0->error = node->errors[L2LEARN_ERROR_FILTER_DROP]; - *next0 = L2LEARN_NEXT_DROP; - } - } - -done: - return; -} - - -static uword -l2learn_node_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * frame) -{ - u32 n_left_from, *from, *to_next; - l2learn_next_t next_index; - l2learn_main_t *msm = &l2learn_main; - vlib_node_t *n = vlib_get_node (vm, l2learn_node.index); - u32 node_counter_base_index = n->error_heap_index; - vlib_error_main_t *em = &vm->error_main; - l2fib_entry_key_t cached_key; - l2fib_entry_result_t cached_result; - u8 timestamp = (u8) (vlib_time_now (vm) / 60); - - from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; /* number of packets to process */ - next_index = node->cached_next_index; - - /* Clear the one-entry cache in case mac table was updated */ - cached_key.raw = ~0; - cached_result.raw = ~0; /* warning be gone */ - - while (n_left_from > 0) - { - u32 n_left_to_next; - - /* get space to enqueue frame to graph node "next_index" */ - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); - - while (n_left_from >= 8 && n_left_to_next >= 4) - { - u32 bi0, bi1, bi2, bi3; - vlib_buffer_t *b0, *b1, *b2, *b3; - u32 next0, next1, next2, next3; - u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3; - ethernet_header_t *h0, *h1, *h2, *h3; - l2fib_entry_key_t key0, key1, key2, key3; - l2fib_entry_result_t result0, result1, result2, result3; - u32 bucket0, bucket1, bucket2, bucket3; - - /* Prefetch next iteration. */ - { - vlib_buffer_t *p4, *p5, *p6, *p7;; - - p4 = vlib_get_buffer (vm, from[4]); - p5 = vlib_get_buffer (vm, from[5]); - p6 = vlib_get_buffer (vm, from[6]); - p7 = vlib_get_buffer (vm, from[7]); - - vlib_prefetch_buffer_header (p4, LOAD); - vlib_prefetch_buffer_header (p5, LOAD); - vlib_prefetch_buffer_header (p6, LOAD); - vlib_prefetch_buffer_header (p7, LOAD); - - CLIB_PREFETCH (p4->data, CLIB_CACHE_LINE_BYTES, STORE); - CLIB_PREFETCH (p5->data, CLIB_CACHE_LINE_BYTES, STORE); - CLIB_PREFETCH (p6->data, CLIB_CACHE_LINE_BYTES, STORE); - CLIB_PREFETCH (p7->data, CLIB_CACHE_LINE_BYTES, STORE); - } - - /* speculatively enqueue b0 and b1 to the current next frame */ - /* bi is "buffer index", b is pointer to the buffer */ - to_next[0] = bi0 = from[0]; - to_next[1] = bi1 = from[1]; - to_next[2] = bi2 = from[2]; - to_next[3] = bi3 = from[3]; - from += 4; - to_next += 4; - n_left_from -= 4; - n_left_to_next -= 4; - - b0 = vlib_get_buffer (vm, bi0); - b1 = vlib_get_buffer (vm, bi1); - b2 = vlib_get_buffer (vm, bi2); - b3 = vlib_get_buffer (vm, bi3); - - /* RX interface handles */ - sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; - sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; - sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_RX]; - sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_RX]; - - /* Process 4 x pkts */ - - h0 = vlib_buffer_get_current (b0); - h1 = vlib_buffer_get_current (b1); - h2 = vlib_buffer_get_current (b2); - h3 = vlib_buffer_get_current (b3); - - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) - { - if (b0->flags & VLIB_BUFFER_IS_TRACED) - { - l2learn_trace_t *t = - vlib_add_trace (vm, node, b0, sizeof (*t)); - t->sw_if_index = sw_if_index0; - t->bd_index = vnet_buffer (b0)->l2.bd_index; - clib_memcpy (t->src, h0->src_address, 6); - clib_memcpy (t->dst, h0->dst_address, 6); - } - if (b1->flags & VLIB_BUFFER_IS_TRACED) - { - l2learn_trace_t *t = - vlib_add_trace (vm, node, b1, sizeof (*t)); - t->sw_if_index = sw_if_index1; - t->bd_index = vnet_buffer (b1)->l2.bd_index; - clib_memcpy (t->src, h1->src_address, 6); - clib_memcpy (t->dst, h1->dst_address, 6); - } - if (b2->flags & VLIB_BUFFER_IS_TRACED) - { - l2learn_trace_t *t = - vlib_add_trace (vm, node, b2, sizeof (*t)); - t->sw_if_index = sw_if_index2; - t->bd_index = vnet_buffer (b2)->l2.bd_index; - clib_memcpy (t->src, h2->src_address, 6); - clib_memcpy (t->dst, h2->dst_address, 6); - } - if (b3->flags & VLIB_BUFFER_IS_TRACED) - { - l2learn_trace_t *t = - vlib_add_trace (vm, node, b3, sizeof (*t)); - t->sw_if_index = sw_if_index3; - t->bd_index = vnet_buffer (b3)->l2.bd_index; - clib_memcpy (t->src, h3->src_address, 6); - clib_memcpy (t->dst, h3->dst_address, 6); - } - } - - /* process 4 pkts */ - vlib_node_increment_counter (vm, l2learn_node.index, - L2LEARN_ERROR_L2LEARN, 4); - - l2fib_lookup_4 (msm->mac_table, &cached_key, &cached_result, - h0->src_address, - h1->src_address, - h2->src_address, - h3->src_address, - vnet_buffer (b0)->l2.bd_index, - vnet_buffer (b1)->l2.bd_index, - vnet_buffer (b2)->l2.bd_index, - vnet_buffer (b3)->l2.bd_index, - &key0, &key1, &key2, &key3, - &bucket0, &bucket1, &bucket2, &bucket3, - &result0, &result1, &result2, &result3); - - l2learn_process (node, msm, &em->counters[node_counter_base_index], - b0, sw_if_index0, &key0, &cached_key, - &bucket0, &result0, &next0, timestamp); - - l2learn_process (node, msm, &em->counters[node_counter_base_index], - b1, sw_if_index1, &key1, &cached_key, - &bucket1, &result1, &next1, timestamp); - - l2learn_process (node, msm, &em->counters[node_counter_base_index], - b2, sw_if_index2, &key2, &cached_key, - &bucket2, &result2, &next2, timestamp); - - l2learn_process (node, msm, &em->counters[node_counter_base_index], - b3, sw_if_index3, &key3, &cached_key, - &bucket3, &result3, &next3, timestamp); - - /* verify speculative enqueues, maybe switch current next frame */ - /* if next0==next1==next_index then nothing special needs to be done */ - vlib_validate_buffer_enqueue_x4 (vm, node, next_index, - to_next, n_left_to_next, - bi0, bi1, bi2, bi3, - next0, next1, next2, next3); - } - - while (n_left_from > 0 && n_left_to_next > 0) - { - u32 bi0; - vlib_buffer_t *b0; - u32 next0; - u32 sw_if_index0; - ethernet_header_t *h0; - l2fib_entry_key_t key0; - l2fib_entry_result_t result0; - u32 bucket0; - - /* 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); - - sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; - - h0 = vlib_buffer_get_current (b0); - - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - l2learn_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); - t->sw_if_index = sw_if_index0; - t->bd_index = vnet_buffer (b0)->l2.bd_index; - clib_memcpy (t->src, h0->src_address, 6); - clib_memcpy (t->dst, h0->dst_address, 6); - } - - /* process 1 pkt */ - vlib_node_increment_counter (vm, l2learn_node.index, - L2LEARN_ERROR_L2LEARN, 1); - - - l2fib_lookup_1 (msm->mac_table, &cached_key, &cached_result, - h0->src_address, vnet_buffer (b0)->l2.bd_index, - &key0, &bucket0, &result0); - - l2learn_process (node, msm, &em->counters[node_counter_base_index], - b0, sw_if_index0, &key0, &cached_key, - &bucket0, &result0, &next0, timestamp); - - /* 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); - } - - return frame->n_vectors; -} - - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (l2learn_node,static) = { - .function = l2learn_node_fn, - .name = "l2-learn", - .vector_size = sizeof (u32), - .format_trace = format_l2learn_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(l2learn_error_strings), - .error_strings = l2learn_error_strings, - - .n_next_nodes = L2LEARN_N_NEXT, - - /* edit / add dispositions here */ - .next_nodes = { - [L2LEARN_NEXT_DROP] = "error-drop", - [L2LEARN_NEXT_L2FWD] = "l2-fwd", - }, -}; -/* *INDENT-ON* */ - -VLIB_NODE_FUNCTION_MULTIARCH (l2learn_node, l2learn_node_fn) - clib_error_t *l2learn_init (vlib_main_t * vm) -{ - l2learn_main_t *mp = &l2learn_main; - - mp->vlib_main = vm; - mp->vnet_main = vnet_get_main (); - - /* Initialize the feature next-node indexes */ - feat_bitmap_init_next_nodes (vm, - l2learn_node.index, - L2INPUT_N_FEAT, - l2input_get_feat_names (), - mp->feat_next_node_index); - - /* init the hash table ptr */ - mp->mac_table = get_mac_table (); - - /* - * Set the default number of dynamically learned macs to the number - * of buckets. - */ - mp->global_learn_limit = L2FIB_NUM_BUCKETS * 16; - - return 0; -} - -VLIB_INIT_FUNCTION (l2learn_init); - - -/** - * Set subinterface learn enable/disable. - * The CLI format is: - * set interface l2 learn <interface> [disable] - */ -static clib_error_t * -int_learn (vlib_main_t * vm, - unformat_input_t * input, vlib_cli_command_t * cmd) -{ - vnet_main_t *vnm = vnet_get_main (); - clib_error_t *error = 0; - u32 sw_if_index; - u32 enable; - - if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index)) - { - error = clib_error_return (0, "unknown interface `%U'", - format_unformat_error, input); - goto done; - } - - enable = 1; - if (unformat (input, "disable")) - { - enable = 0; - } - - /* set the interface flag */ - l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_LEARN, enable); - -done: - return error; -} - -/*? - * Layer 2 learning can be enabled and disabled on each - * interface and on each bridge-domain. Use this command to - * manage interfaces. It is enabled by default. - * - * @cliexpar - * Example of how to enable learning: - * @cliexcmd{set interface l2 learn GigabitEthernet0/8/0} - * Example of how to disable learning: - * @cliexcmd{set interface l2 learn GigabitEthernet0/8/0 disable} -?*/ -/* *INDENT-OFF* */ -VLIB_CLI_COMMAND (int_learn_cli, static) = { - .path = "set interface l2 learn", - .short_help = "set interface l2 learn <interface> [disable]", - .function = int_learn, -}; -/* *INDENT-ON* */ - - -static clib_error_t * -l2learn_config (vlib_main_t * vm, unformat_input_t * input) -{ - l2learn_main_t *mp = &l2learn_main; - - while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) - { - if (unformat (input, "limit %d", &mp->global_learn_limit)) - ; - - else - return clib_error_return (0, "unknown input `%U'", - format_unformat_error, input); - } - - return 0; -} - -VLIB_CONFIG_FUNCTION (l2learn_config, "l2learn"); - - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ |