diff options
Diffstat (limited to 'vnet/vnet/l2/l2_input_vtr.c')
| -rw-r--r-- | vnet/vnet/l2/l2_input_vtr.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/vnet/vnet/l2/l2_input_vtr.c b/vnet/vnet/l2/l2_input_vtr.c new file mode 100644 index 00000000000..d07a0287d04 --- /dev/null +++ b/vnet/vnet/l2/l2_input_vtr.c @@ -0,0 +1,314 @@ +/* + * l2_input_vtr.c : layer 2 input vlan tag rewrite processing + * + * 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/ethernet/ethernet.h> +#include <vnet/ethernet/packet.h> +#include <vnet/l2/l2_input.h> +#include <vnet/l2/feat_bitmap.h> +#include <vnet/l2/l2_vtr.h> +#include <vnet/l2/l2_input_vtr.h> +#include <vnet/l2/l2_output.h> + +#include <vppinfra/error.h> +#include <vppinfra/cache.h> + + +typedef struct { + /* per-pkt trace data */ + u8 src[6]; + u8 dst[6]; + u8 raw[12]; // raw data (vlans) + u32 sw_if_index; +} l2_invtr_trace_t; + +/* packet trace format function */ +static u8 * format_l2_invtr_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_invtr_trace_t * t = va_arg (*args, l2_invtr_trace_t *); + + s = format (s, "l2-input-vtr: sw_if_index %d dst %U src %U data " + "%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x", + t->sw_if_index, + format_ethernet_address, t->dst, + format_ethernet_address, t->src, + t->raw[0], t->raw[1], t->raw[2], t->raw[3], t->raw[4], t->raw[5], + t->raw[6], t->raw[7], t->raw[8], t->raw[9], t->raw[10], t->raw[11]); + return s; +} + +l2_invtr_main_t l2_invtr_main; + +static vlib_node_registration_t l2_invtr_node; + +#define foreach_l2_invtr_error \ +_(L2_INVTR, "L2 inverter packets") \ +_(DROP, "L2 input tag rewrite drops") + +typedef enum { +#define _(sym,str) L2_INVTR_ERROR_##sym, + foreach_l2_invtr_error +#undef _ + L2_INVTR_N_ERROR, +} l2_invtr_error_t; + +static char * l2_invtr_error_strings[] = { +#define _(sym,string) string, + foreach_l2_invtr_error +#undef _ +}; + +typedef enum { + L2_INVTR_NEXT_DROP, + L2_INVTR_N_NEXT, +} l2_invtr_next_t; + + +static uword +l2_invtr_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, * from, * to_next; + l2_invtr_next_t next_index; + l2_invtr_main_t * msm = &l2_invtr_main; + // vlib_node_t *n = vlib_get_node (vm, l2_invtr_node.index); + // u32 node_counter_base_index = n->error_heap_index; + // vlib_error_main_t * em = &vm->error_main; + + 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 >= 6 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t * b0, * b1; + u32 next0, next1; + u32 sw_if_index0, sw_if_index1; + u32 feature_bitmap0, feature_bitmap1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t * p2, * p3, * p4, * p5; + u32 sw_if_index2, sw_if_index3; + + p2 = vlib_get_buffer (vm, from[2]); + p3 = vlib_get_buffer (vm, from[3]); + p4 = vlib_get_buffer (vm, from[4]); + p5 = vlib_get_buffer (vm, from[5]); + + // Prefetch the buffer header and packet for the N+2 loop iteration + vlib_prefetch_buffer_header (p4, LOAD); + vlib_prefetch_buffer_header (p5, LOAD); + + CLIB_PREFETCH (p4->data, CLIB_CACHE_LINE_BYTES, STORE); + CLIB_PREFETCH (p5->data, CLIB_CACHE_LINE_BYTES, STORE); + + // Prefetch the input config for the N+1 loop iteration + // This depends on the buffer header above + sw_if_index2 = vnet_buffer(p2)->sw_if_index[VLIB_RX]; + sw_if_index3 = vnet_buffer(p3)->sw_if_index[VLIB_RX]; + CLIB_PREFETCH (vec_elt_at_index(l2output_main.configs, sw_if_index2), CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (vec_elt_at_index(l2output_main.configs, sw_if_index3), CLIB_CACHE_LINE_BYTES, LOAD); + } + + /* 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]; + + // process 2 packets + // em->counters[node_counter_base_index + L2_INVTR_ERROR_L2_INVTR] += 2; + + // Remove ourself from the feature bitmap + feature_bitmap0 = vnet_buffer(b0)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR; + feature_bitmap1 = vnet_buffer(b1)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR; + + // save for next feature graph nodes + vnet_buffer(b0)->l2.feature_bitmap = feature_bitmap0; + vnet_buffer(b1)->l2.feature_bitmap = feature_bitmap1; + + // Determine the next node + next0 = feat_bitmap_get_next_node_index(msm->feat_next_node_index, + feature_bitmap0); + next1 = feat_bitmap_get_next_node_index(msm->feat_next_node_index, + feature_bitmap1); + + // perform the tag rewrite on two packets + if (l2_vtr_process(b0, &(vec_elt_at_index(l2output_main.configs, sw_if_index0)->input_vtr))) { + // Drop packet + next0 = L2_INVTR_NEXT_DROP; + b0->error = node->errors[L2_INVTR_ERROR_DROP]; + } + if (l2_vtr_process(b1, &(vec_elt_at_index(l2output_main.configs, sw_if_index1)->input_vtr))) { + // Drop packet + next1 = L2_INVTR_NEXT_DROP; + b1->error = node->errors[L2_INVTR_ERROR_DROP]; + } + + if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE))) { + if (b0->flags & VLIB_BUFFER_IS_TRACED) { + l2_invtr_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + ethernet_header_t * h0 = vlib_buffer_get_current (b0); + t->sw_if_index = sw_if_index0; + memcpy(t->src, h0->src_address, 6); + memcpy(t->dst, h0->dst_address, 6); + memcpy(t->raw, &h0->type, sizeof(t->raw)); + } + if (b1->flags & VLIB_BUFFER_IS_TRACED) { + l2_invtr_trace_t *t = + vlib_add_trace (vm, node, b1, sizeof (*t)); + ethernet_header_t * h1 = vlib_buffer_get_current (b1); + t->sw_if_index = sw_if_index0; + memcpy(t->src, h1->src_address, 6); + memcpy(t->dst, h1->dst_address, 6); + memcpy(t->raw, &h1->type, sizeof(t->raw)); + } + } + + /* 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; + u32 feature_bitmap0; + + /* 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]; + + // process 1 packet + // em->counters[node_counter_base_index + L2_INVTR_ERROR_L2_INVTR] += 1; + + // Remove ourself from the feature bitmap + feature_bitmap0 = vnet_buffer(b0)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR; + + // save for next feature graph nodes + vnet_buffer(b0)->l2.feature_bitmap = feature_bitmap0; + + // Determine the next node + next0 = feat_bitmap_get_next_node_index(msm->feat_next_node_index, + feature_bitmap0); + + // perform the tag rewrite on one packet + if (l2_vtr_process(b0, &(vec_elt_at_index(l2output_main.configs, sw_if_index0)->input_vtr))) { + // Drop packet + next0 = L2_INVTR_NEXT_DROP; + b0->error = node->errors[L2_INVTR_ERROR_DROP]; + } + + if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) { + l2_invtr_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + ethernet_header_t * h0 = vlib_buffer_get_current (b0); + t->sw_if_index = sw_if_index0; + memcpy(t->src, h0->src_address, 6); + memcpy(t->dst, h0->dst_address, 6); + memcpy(t->raw, &h0->type, sizeof(t->raw)); + } + + /* 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 (l2_invtr_node,static) = { + .function = l2_invtr_node_fn, + .name = "l2-input-vtr", + .vector_size = sizeof (u32), + .format_trace = format_l2_invtr_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(l2_invtr_error_strings), + .error_strings = l2_invtr_error_strings, + + .n_next_nodes = L2_INVTR_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [L2_INVTR_NEXT_DROP] = "error-drop", + }, +}; + +clib_error_t *l2_invtr_init (vlib_main_t *vm) +{ + l2_invtr_main_t * mp = &l2_invtr_main; + + mp->vlib_main = vm; + mp->vnet_main = vnet_get_main(); + + // Initialize the feature next-node indexes + feat_bitmap_init_next_nodes(vm, + l2_invtr_node.index, + L2INPUT_N_FEAT, + l2input_get_feat_names(), + mp->feat_next_node_index); + + return 0; +} + +VLIB_INIT_FUNCTION (l2_invtr_init); + |