From cb9cadad578297ffd78fa8a33670bdf1ab669e7e Mon Sep 17 00:00:00 2001 From: Ed Warnicke Date: Tue, 8 Dec 2015 15:45:58 -0700 Subject: Initial commit of vpp code. Change-Id: Ib246f1fbfce93274020ee93ce461e3d8bd8b9f17 Signed-off-by: Ed Warnicke --- vnet/vnet/l2/l2_fwd.c | 446 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 446 insertions(+) create mode 100644 vnet/vnet/l2/l2_fwd.c (limited to 'vnet/vnet/l2/l2_fwd.c') diff --git a/vnet/vnet/l2/l2_fwd.c b/vnet/vnet/l2/l2_fwd.c new file mode 100644 index 00000000000..089d4008ea8 --- /dev/null +++ b/vnet/vnet/l2/l2_fwd.c @@ -0,0 +1,446 @@ +/* + * l2_fwd.c : layer 2 forwarding 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 +#include +#include +#include +#include + +#include +#include +#include +#include + +#include +#include +#include + + +typedef struct { + + // Hash table + BVT(clib_bihash) *mac_table; + + // next node index for the L3 input node of each ethertype + next_by_ethertype_t l3_next; + + /* convenience variables */ + vlib_main_t * vlib_main; + vnet_main_t * vnet_main; +} l2fwd_main_t; + +typedef struct { + /* per-pkt trace data */ + u8 src[6]; + u8 dst[6]; + u32 sw_if_index; + u16 bd_index; +} l2fwd_trace_t; + +/* packet trace format function */ +static u8 * format_l2fwd_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 *); + l2fwd_trace_t * t = va_arg (*args, l2fwd_trace_t *); + + s = format (s, "l2-fwd: 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; +} + +l2fwd_main_t l2fwd_main; + +static vlib_node_registration_t l2fwd_node; + +#define foreach_l2fwd_error \ +_(L2FWD, "L2 forward packets") \ +_(FLOOD, "L2 forward misses") \ +_(HIT, "L2 forward hits") \ +_(BVI_TAGGED, "BVI packet with vlan tag") \ +_(BVI_ETHERTYPE, "BVI packet with unhandled ethertype") \ +_(FILTER_DROP, "Filter Mac Drop") \ +_(REFLECT_DROP, "Reflection Drop") + +typedef enum { +#define _(sym,str) L2FWD_ERROR_##sym, + foreach_l2fwd_error +#undef _ + L2FWD_N_ERROR, +} l2fwd_error_t; + +static char * l2fwd_error_strings[] = { +#define _(sym,string) string, + foreach_l2fwd_error +#undef _ +}; + +typedef enum { + L2FWD_NEXT_L2_OUTPUT, + L2FWD_NEXT_FLOOD, + L2FWD_NEXT_DROP, + L2FWD_N_NEXT, +} l2fwd_next_t; + +// Forward one packet based on the mac table lookup result + +static_always_inline void +l2fwd_process (vlib_main_t * vm, + vlib_node_runtime_t * node, + l2fwd_main_t * msm, + vlib_error_main_t * em, + vlib_buffer_t * b0, + u32 sw_if_index0, + l2fib_entry_result_t * result0, + u32 * next0) +{ + if (PREDICT_FALSE (result0->raw == ~0)) { + // lookup miss, so flood + // TODO:replicate packet to each intf in bridge-domain + // For now just drop + if (vnet_buffer(b0)->l2.feature_bitmap & L2INPUT_FEAT_UU_FLOOD) { + *next0 = L2FWD_NEXT_FLOOD; + } else { + // Flooding is disabled + b0->error = node->errors[L2FWD_ERROR_FLOOD]; + *next0 = L2FWD_NEXT_DROP; + } + + } else { + + // lookup hit, forward packet +#ifdef COUNTERS + em->counters[node_counter_base_index + L2FWD_ERROR_HIT] += 1; +#endif + + vnet_buffer(b0)->sw_if_index[VLIB_TX] = result0->fields.sw_if_index; + *next0 = L2FWD_NEXT_L2_OUTPUT; + + // perform reflection check + if (PREDICT_FALSE (sw_if_index0 == result0->fields.sw_if_index)) { + b0->error = node->errors[L2FWD_ERROR_REFLECT_DROP]; + *next0 = L2FWD_NEXT_DROP; + + // perform filter check + } else if (PREDICT_FALSE (result0->fields.filter)) { + b0->error = node->errors[L2FWD_ERROR_FILTER_DROP]; + *next0 = L2FWD_NEXT_DROP; + + // perform BVI check + } else if (PREDICT_FALSE (result0->fields.bvi)) { + u32 rc; + rc = l2_to_bvi (vm, + msm->vnet_main, + b0, + vnet_buffer(b0)->sw_if_index[VLIB_TX], + &msm->l3_next, + next0); + + if (PREDICT_FALSE(rc)) { + if (rc == TO_BVI_ERR_TAGGED) { + b0->error = node->errors[L2FWD_ERROR_BVI_TAGGED]; + *next0 = L2FWD_NEXT_DROP; + } else if (rc == TO_BVI_ERR_ETHERTYPE) { + b0->error = node->errors[L2FWD_ERROR_BVI_ETHERTYPE]; + *next0 = L2FWD_NEXT_DROP; + } + } + } + } +} + + +static uword +l2fwd_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, * from, * to_next; + l2fwd_next_t next_index; + l2fwd_main_t * msm = &l2fwd_main; + vlib_node_t *n = vlib_get_node (vm, l2fwd_node.index); + CLIB_UNUSED(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; + + // Clear the one-entry cache in case mac table was updated + cached_key.raw = ~0; + cached_result.raw = ~0; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; /* number of packets to process */ + next_index = node->cached_next_index; + + 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 >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t * b0, * b1; + u32 next0, next1; + u32 sw_if_index0, sw_if_index1; + ethernet_header_t * h0, * h1; + l2fib_entry_key_t key0, key1; + l2fib_entry_result_t result0, result1; + u32 bucket0, bucket1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t * p2, * p3; + + p2 = vlib_get_buffer (vm, from[2]); + p3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (p2, LOAD); + vlib_prefetch_buffer_header (p3, LOAD); + + CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); + CLIB_PREFETCH (p3->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]; + 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); + + /* 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]; + + h0 = vlib_buffer_get_current (b0); + h1 = vlib_buffer_get_current (b1); + + if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE))) + { + if (b0->flags & VLIB_BUFFER_IS_TRACED) + { + l2fwd_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; + memcpy(t->src, h0->src_address, 6); + memcpy(t->dst, h0->dst_address, 6); + } + if (b1->flags & VLIB_BUFFER_IS_TRACED) + { + l2fwd_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; + memcpy(t->src, h1->src_address, 6); + memcpy(t->dst, h1->dst_address, 6); + } + } + + /* process 2 pkts */ +#ifdef COUNTERS + em->counters[node_counter_base_index + L2FWD_ERROR_L2FWD] += 2; +#endif + l2fib_lookup_2 (msm->mac_table, &cached_key, &cached_result, + h0->dst_address, + h1->dst_address, + vnet_buffer(b0)->l2.bd_index, + vnet_buffer(b1)->l2.bd_index, + &key0, // not used + &key1, // not used + &bucket0, // not used + &bucket1, // not used + &result0, + &result1); + l2fwd_process (vm, node, msm, em, b0, sw_if_index0, &result0, &next0); + l2fwd_process (vm, node, msm, em, b1, sw_if_index1, &result1, &next1); + + /* verify speculative enqueues, maybe switch current next frame */ + /* if next0==next1==next_index then nothing special needs to be done */ + 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; + 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))) { + l2fwd_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; + memcpy(t->src, h0->src_address, 6); + memcpy(t->dst, h0->dst_address, 6); + } + + /* process 1 pkt */ +#ifdef COUNTERS + em->counters[node_counter_base_index + L2FWD_ERROR_L2FWD] += 1; +#endif + l2fib_lookup_1 (msm->mac_table, &cached_key, &cached_result, + h0->dst_address, vnet_buffer(b0)->l2.bd_index, + &key0, // not used + &bucket0, // not used + &result0); + l2fwd_process (vm, node, msm, em, b0, sw_if_index0, &result0, &next0); + + /* 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; +} + +VLIB_REGISTER_NODE (l2fwd_node,static) = { + .function = l2fwd_node_fn, + .name = "l2-fwd", + .vector_size = sizeof (u32), + .format_trace = format_l2fwd_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(l2fwd_error_strings), + .error_strings = l2fwd_error_strings, + + .n_next_nodes = L2FWD_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [L2FWD_NEXT_L2_OUTPUT] = "l2-output", + [L2FWD_NEXT_FLOOD] = "l2-flood", + [L2FWD_NEXT_DROP] = "error-drop", + }, +}; + +clib_error_t *l2fwd_init (vlib_main_t *vm) +{ + l2fwd_main_t * mp = &l2fwd_main; + + mp->vlib_main = vm; + mp->vnet_main = vnet_get_main(); + + /* init the hash table ptr */ + mp->mac_table = get_mac_table(); + + // Initialize the next nodes for each ethertype + next_by_ethertype_init (&mp->l3_next); + + return 0; +} + +VLIB_INIT_FUNCTION (l2fwd_init); + + +// Add the L3 input node for this ethertype to the next nodes structure +void +l2fwd_register_input_type (vlib_main_t * vm, + ethernet_type_t type, + u32 node_index) +{ + l2fwd_main_t * mp = &l2fwd_main; + u32 next_index; + + next_index = vlib_node_add_next (vm, + l2fwd_node.index, + node_index); + + next_by_ethertype_register (&mp->l3_next, type, next_index); +} + + +// set subinterface forward enable/disable +// The CLI format is: +// set interface l2 forward [disable] +static clib_error_t * +int_fwd (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 + if (l2input_intf_config(sw_if_index)->xconnect) { + l2input_intf_bitmap_enable(sw_if_index, L2INPUT_FEAT_XCONNECT, enable); + } else { + l2input_intf_bitmap_enable(sw_if_index, L2INPUT_FEAT_FWD, enable); + } + + done: + return error; +} + +VLIB_CLI_COMMAND (int_fwd_cli, static) = { + .path = "set interface l2 forward", + .short_help = "set interface l2 forward [disable]", + .function = int_fwd, +}; -- cgit 1.2.3-korg