/* * feat_bitmap.c: bitmap for managing feature invocation * * 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 <vnet/ethernet/packet.h> #include <vlib/cli.h> #include <vnet/l2/l2_input.h> #include <vnet/l2/feat_bitmap.h> #include <vppinfra/error.h> #include <vppinfra/hash.h> #include <vppinfra/cache.h> /* * Drop node for feature bitmaps * For features that just do a drop, or are not yet implemented. * Initial feature dispatch nodes don't need to set b0->error * in case of a possible drop because that will be done here. *The next node is always error-drop. */ static vlib_node_registration_t feat_bitmap_drop_node; #define foreach_feat_bitmap_drop_error \ _(NO_FWD, "L2 feature forwarding disabled") \ _(NYI, "L2 feature not implemented") typedef enum { #define _(sym,str) FEAT_BITMAP_DROP_ERROR_##sym, foreach_feat_bitmap_drop_error #undef _ FEAT_BITMAP_DROP_N_ERROR, } feat_bitmap_drop_error_t; static char *feat_bitmap_drop_error_strings[] = { #define _(sym,string) string, foreach_feat_bitmap_drop_error #undef _ }; typedef enum { FEAT_BITMAP_DROP_NEXT_DROP, FEAT_BITMAP_DROP_N_NEXT, } feat_bitmap_drop_next_t; typedef struct { u32 feature_bitmap; } feat_bitmap_drop_trace_t; /* packet trace format function */ static u8 * format_feat_bitmap_drop_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 *); feat_bitmap_drop_trace_t *t = va_arg (*args, feat_bitmap_drop_trace_t *); s = format (s, "feat_bitmap_drop: feature bitmap 0x%08x", t->feature_bitmap); return s; } static uword feat_bitmap_drop_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; feat_bitmap_drop_next_t next_index; 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 > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; u32 next0; /* 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); if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { feat_bitmap_drop_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->feature_bitmap = vnet_buffer (b0)->l2.feature_bitmap; } if (vnet_buffer (b0)->l2.feature_bitmap == 1) { /* * If we are executing the last feature, this is the * No forwarding catch-all */ b0->error = node->errors[FEAT_BITMAP_DROP_ERROR_NO_FWD]; } else { b0->error = node->errors[FEAT_BITMAP_DROP_ERROR_NYI]; } next0 = FEAT_BITMAP_DROP_NEXT_DROP; /* 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; } clib_error_t * feat_bitmap_drop_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (feat_bitmap_drop_init); /* *INDENT-OFF* */ VLIB_REGISTER_NODE (feat_bitmap_drop_node,static) = { .function = feat_bitmap_drop_node_fn, .name = "feature-bitmap-drop", .vector_size = sizeof (u32), .format_trace = format_feat_bitmap_drop_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(feat_bitmap_drop_error_strings), .error_strings = feat_bitmap_drop_error_strings, .n_next_nodes = FEAT_BITMAP_DROP_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [FEAT_BITMAP_DROP_NEXT_DROP] = "error-drop", }, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */