diff options
Diffstat (limited to 'src/vnet/hdlc/node.c')
| -rw-r--r-- | src/vnet/hdlc/node.c | 351 |
1 files changed, 351 insertions, 0 deletions
diff --git a/src/vnet/hdlc/node.c b/src/vnet/hdlc/node.c new file mode 100644 index 00000000000..4fe0296aca1 --- /dev/null +++ b/src/vnet/hdlc/node.c @@ -0,0 +1,351 @@ +/* + * Copyright (c) 2015 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. + */ +/* + * hdlc_node.c: hdlc packet processing + * + * Copyright (c) 2010 Eliot Dresselhaus + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <vlib/vlib.h> +#include <vnet/pg/pg.h> +#include <vnet/hdlc/hdlc.h> +#include <vppinfra/sparse_vec.h> + +#define foreach_hdlc_input_next \ + _ (PUNT, "error-punt") \ + _ (DROP, "error-drop") + +typedef enum { +#define _(s,n) HDLC_INPUT_NEXT_##s, + foreach_hdlc_input_next +#undef _ + HDLC_INPUT_N_NEXT, +} hdlc_input_next_t; + +typedef struct { + u8 packet_data[32]; +} hdlc_input_trace_t; + +static u8 * format_hdlc_input_trace (u8 * s, va_list * va) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); + hdlc_input_trace_t * t = va_arg (*va, hdlc_input_trace_t *); + + s = format (s, "%U", format_hdlc_header, t->packet_data); + + return s; +} + +typedef struct { + /* Sparse vector mapping hdlc protocol in network byte order + to next index. */ + u16 * next_by_protocol; + + u32 * sparse_index_by_next_index; +} hdlc_input_runtime_t; + +static uword +hdlc_input (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + hdlc_input_runtime_t * rt = (void *) node->runtime_data; + u32 n_left_from, next_index, i_next, * from, * to_next; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + if (node->flags & VLIB_NODE_FLAG_TRACE) + vlib_trace_frame_buffers_only (vm, node, + from, + n_left_from, + sizeof (from[0]), + sizeof (hdlc_input_trace_t)); + + next_index = node->cached_next_index; + i_next = vec_elt (rt->sparse_index_by_next_index, 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 >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t * b0, * b1; + hdlc_header_t * h0, * h1; + u32 i0, i1, len0, len1, protocol0, protocol1, enqueue_code; + + /* Prefetch next iteration. */ + { + vlib_buffer_t * b2, * b3; + + b2 = vlib_get_buffer (vm, from[2]); + b3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (b2, LOAD); + vlib_prefetch_buffer_header (b3, LOAD); + + CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD); + CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD); + } + + bi0 = from[0]; + bi1 = from[1]; + to_next[0] = bi0; + to_next[1] = bi1; + from += 2; + to_next += 2; + n_left_to_next -= 2; + n_left_from -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + h0 = (void *) (b0->data + b0->current_data); + h1 = (void *) (b1->data + b1->current_data); + + protocol0 = h0->protocol; + protocol1 = h1->protocol; + + /* Add padding bytes for OSI protocols. */ + len0 = sizeof (h0[0]); + len1 = sizeof (h1[0]); + + len0 += protocol0 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi); + len1 += protocol1 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi); + + b0->current_data += len0; + b1->current_data += len1; + + b0->current_length -= len0; + b1->current_length -= len1; + + /* Index sparse array with network byte order. */ + sparse_vec_index2 (rt->next_by_protocol, protocol0, protocol1, &i0, &i1); + + b0->error = node->errors[i0 == SPARSE_VEC_INVALID_INDEX ? HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE]; + b1->error = node->errors[i1 == SPARSE_VEC_INVALID_INDEX ? HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE]; + + enqueue_code = (i0 != i_next) + 2*(i1 != i_next); + + if (PREDICT_FALSE (enqueue_code != 0)) + { + switch (enqueue_code) + { + case 1: + /* A B A */ + to_next[-2] = bi1; + to_next -= 1; + n_left_to_next += 1; + vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i0), bi0); + break; + + case 2: + /* A A B */ + to_next -= 1; + n_left_to_next += 1; + vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i1), bi1); + break; + + case 3: + /* A B B or A B C */ + to_next -= 2; + n_left_to_next += 2; + vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i0), bi0); + vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i1), bi1); + if (i0 == i1) + { + vlib_put_next_frame (vm, node, next_index, + n_left_to_next); + i_next = i1; + next_index = vec_elt (rt->next_by_protocol, i_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) + { + u32 bi0; + vlib_buffer_t * b0; + hdlc_header_t * h0; + u32 i0, len0, protocol0; + + 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); + + h0 = (void *) (b0->data + b0->current_data); + + protocol0 = h0->protocol; + + /* Add padding bytes for OSI protocols. */ + len0 = sizeof (h0[0]); + len0 += protocol0 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi); + + b0->current_data += len0; + b0->current_length -= len0; + + i0 = sparse_vec_index (rt->next_by_protocol, protocol0); + + b0->error = node->errors[i0 == SPARSE_VEC_INVALID_INDEX ? HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE]; + + /* Sent packet to wrong next? */ + if (PREDICT_FALSE (i0 != i_next)) + { + /* Return old frame; remove incorrectly enqueued packet. */ + vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1); + + /* Send to correct next. */ + i_next = i0; + next_index = vec_elt (rt->next_by_protocol, i_next); + vlib_get_next_frame (vm, node, next_index, + to_next, n_left_to_next); + + to_next[0] = bi0; + to_next += 1; + n_left_to_next -= 1; + } + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + return from_frame->n_vectors; +} + +static char * hdlc_error_strings[] = { +#define hdlc_error(n,s) s, +#include "error.def" +#undef hdlc_error +}; + +VLIB_REGISTER_NODE (hdlc_input_node) = { + .function = hdlc_input, + .name = "hdlc-input", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + + .runtime_data_bytes = sizeof (hdlc_input_runtime_t), + + .n_errors = HDLC_N_ERROR, + .error_strings = hdlc_error_strings, + + .n_next_nodes = HDLC_INPUT_N_NEXT, + .next_nodes = { +#define _(s,n) [HDLC_INPUT_NEXT_##s] = n, + foreach_hdlc_input_next +#undef _ + }, + + .format_buffer = format_hdlc_header_with_length, + .format_trace = format_hdlc_input_trace, + .unformat_buffer = unformat_hdlc_header, +}; + +static clib_error_t * hdlc_input_init (vlib_main_t * vm) +{ + hdlc_input_runtime_t * rt; + + { + clib_error_t * error = vlib_call_init_function (vm, hdlc_init); + if (error) + clib_error_report (error); + } + + hdlc_setup_node (vm, hdlc_input_node.index); + + rt = vlib_node_get_runtime_data (vm, hdlc_input_node.index); + + rt->next_by_protocol = sparse_vec_new + (/* elt bytes */ sizeof (rt->next_by_protocol[0]), + /* bits in index */ BITS (((hdlc_header_t *) 0)->protocol)); + + vec_validate (rt->sparse_index_by_next_index, HDLC_INPUT_NEXT_DROP); + vec_validate (rt->sparse_index_by_next_index, HDLC_INPUT_NEXT_PUNT); + rt->sparse_index_by_next_index[HDLC_INPUT_NEXT_DROP] + = SPARSE_VEC_INVALID_INDEX; + rt->sparse_index_by_next_index[HDLC_INPUT_NEXT_PUNT] + = SPARSE_VEC_INVALID_INDEX; + + return 0; +} + +VLIB_INIT_FUNCTION (hdlc_input_init); + +void +hdlc_register_input_protocol (vlib_main_t * vm, + hdlc_protocol_t protocol, + u32 node_index) +{ + hdlc_main_t * em = &hdlc_main; + hdlc_protocol_info_t * pi; + hdlc_input_runtime_t * rt; + u16 * n; + u32 i; + + { + clib_error_t * error = vlib_call_init_function (vm, hdlc_input_init); + if (error) + clib_error_report (error); + } + + pi = hdlc_get_protocol_info (em, protocol); + pi->node_index = node_index; + pi->next_index = vlib_node_add_next (vm, + hdlc_input_node.index, + node_index); + + /* Setup hdlc protocol -> next index sparse vector mapping. */ + rt = vlib_node_get_runtime_data (vm, hdlc_input_node.index); + n = sparse_vec_validate (rt->next_by_protocol, clib_host_to_net_u16 (protocol)); + n[0] = pi->next_index; + + /* Rebuild next index -> sparse index inverse mapping when sparse vector + is updated. */ + vec_validate (rt->sparse_index_by_next_index, pi->next_index); + for (i = 1; i < vec_len (rt->next_by_protocol); i++) + rt->sparse_index_by_next_index[rt->next_by_protocol[i]] = i; +} |