/* * Copyright (c) 2016 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/buffer.h> #include <vnet/bier/bier_fmask.h> #include <vnet/bier/bier_hdr_inlines.h> #include <vlib/vlib.h> static char * bier_output_error_strings[] = { #define bier_error(n,s) s, #include <vnet/bier/bier_output_error.def> #undef bier_error }; /* * Keep these values sematically the same as BIER output */ #define foreach_bier_output_next \ _(DROP, "bier-drop") typedef enum { #define _(s,n) BIER_OUTPUT_NEXT_##s, foreach_bier_output_next #undef _ BIER_OUTPUT_N_NEXT, } bier_output_next_t; typedef enum { #define bier_error(n,s) BIER_OUTPUT_ERROR_##n, #include <vnet/bier/bier_output_error.def> #undef bier_error BIER_OUTPUT_N_ERROR, } bier_output_error_t; /** * Forward declaration */ vlib_node_registration_t bier_output_node; extern vlib_combined_counter_main_t bier_fmask_counters; /** * @brief Packet trace recoed for a BIER output */ typedef struct bier_output_trace_t_ { u32 next_index; index_t bfm_index; mpls_label_t bfm_label; } bier_output_trace_t; static uword bier_output (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { vlib_combined_counter_main_t *cm = &bier_fmask_counters; u32 n_left_from, next_index, * from, * to_next; u32 thread_index; thread_index = vm->thread_index; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; /* * objection your honour! speculation! */ next_index = node->cached_next_index; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { bier_output_next_t next0; bier_bit_string_t bbs; vlib_buffer_t * b0; bier_fmask_t *bfm0; mpls_label_t *h0; bier_hdr_t *bh0; u32 bfmi0; u32 bi0; 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); bh0 = vlib_buffer_get_current (b0); bier_bit_string_init_from_hdr(bh0, &bbs); /* * In the BIER Lookup node we squirelled away the * BIER fmask index as the adj index */ bfmi0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX]; bfm0 = bier_fmask_get(bfmi0); vlib_increment_combined_counter( cm, thread_index, bfmi0, 1, vlib_buffer_length_in_chain (vm, b0)); /* * perform the logical AND of the packet's mask with * that of the fmask objects, to reset the bits that * are only on the shortest path the the fmask NH. */ bier_bit_string_logical_and_string( &bfm0->bfm_bits.bfmb_input_reset_string, &bbs); /* * this is the last time we touch the BIER header * so flip to network order */ bier_hdr_hton(bh0); /* * paint the BIER peer's label */ if (!(bfm0->bfm_flags & BIER_FMASK_FLAG_DISP)) { /* * since a BIFT value and a MPLS label are formated the * same, this painting works OK. */ vlib_buffer_advance(b0, -(word)sizeof(mpls_label_t)); h0 = vlib_buffer_get_current(b0); h0[0] = bfm0->bfm_label; ((char*)h0)[3]= vnet_buffer(b0)->mpls.ttl - 1; } /* * setup next graph node */ next0 = bfm0->bfm_dpo.dpoi_next_node; vnet_buffer(b0)->ip.adj_index[VLIB_TX] = bfm0->bfm_dpo.dpoi_index; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { bier_output_trace_t *tr; tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->next_index = next0; tr->bfm_index = bfmi0; tr->bfm_label = bfm0->bfm_label; } 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, bier_output_node.index, BIER_OUTPUT_ERROR_NONE, from_frame->n_vectors); return (from_frame->n_vectors); } static u8 * format_bier_output_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 *); bier_output_trace_t * t = va_arg (*args, bier_output_trace_t *); s = format (s, " next [%d], BFM index %d label:%x", t->next_index, t->bfm_index, t->bfm_label); return s; } VLIB_REGISTER_NODE (bier_output_node) = { .function = bier_output, .name = "bier-output", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = BIER_OUTPUT_N_ERROR, .error_strings = bier_output_error_strings, .n_next_nodes = BIER_OUTPUT_N_NEXT, .next_nodes = { [BIER_OUTPUT_NEXT_DROP] = "bier-drop", }, .format_trace = format_bier_output_trace, };