diff options
Diffstat (limited to 'src/vnet/l2/feat_bitmap.c')
| -rw-r--r-- | src/vnet/l2/feat_bitmap.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/vnet/l2/feat_bitmap.c b/src/vnet/l2/feat_bitmap.c new file mode 100644 index 00000000..6c046467 --- /dev/null +++ b/src/vnet/l2/feat_bitmap.c @@ -0,0 +1,185 @@ +/* + * 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: + */ |