diff options
Diffstat (limited to 'src/vnet/span/node.c')
| -rw-r--r-- | src/vnet/span/node.c | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/src/vnet/span/node.c b/src/vnet/span/node.c new file mode 100644 index 00000000..9d83d4ef --- /dev/null +++ b/src/vnet/span/node.c @@ -0,0 +1,366 @@ +/* + * 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 <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vppinfra/error.h> + +#include <vnet/span/span.h> +#include <vnet/l2/l2_input.h> +#include <vnet/l2/l2_output.h> +#include <vnet/l2/feat_bitmap.h> + +#include <vppinfra/error.h> +#include <vppinfra/elog.h> + +vlib_node_registration_t span_node; + +/* packet trace format function */ +u8 * +format_span_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 *); + span_trace_t *t = va_arg (*args, span_trace_t *); + + vnet_main_t *vnm = &vnet_main; + s = format (s, "SPAN: mirrored %U -> %U", + format_vnet_sw_if_index_name, vnm, t->src_sw_if_index, + format_vnet_sw_if_index_name, vnm, t->mirror_sw_if_index); + + return s; +} + +#define foreach_span_error \ +_(HITS, "SPAN incomming packets processed") + +typedef enum +{ +#define _(sym,str) SPAN_ERROR_##sym, + foreach_span_error +#undef _ + SPAN_N_ERROR, +} span_error_t; + +static char *span_error_strings[] = { +#define _(sym,string) string, + foreach_span_error +#undef _ +}; + +static_always_inline void +span_mirror (vlib_main_t * vm, vlib_node_runtime_t * node, u32 sw_if_index0, + vlib_buffer_t * b0, vlib_frame_t ** mirror_frames, + vlib_rx_or_tx_t rxtx, span_feat_t sf) +{ + vlib_buffer_t *c0; + span_main_t *sm = &span_main; + vnet_main_t *vnm = &vnet_main; + u32 *to_mirror_next = 0; + u32 i; + + span_interface_t *si0 = vec_elt_at_index (sm->interfaces, sw_if_index0); + span_mirror_t *sm0 = &si0->mirror_rxtx[sf][rxtx]; + + if (sm0->num_mirror_ports == 0) + return; + + /* Don't do it again */ + if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_SPAN_CLONE)) + return; + + /* *INDENT-OFF* */ + clib_bitmap_foreach (i, sm0->mirror_ports, ( + { + if (mirror_frames[i] == 0) + { + if (sf == SPAN_FEAT_L2) + mirror_frames[i] = vlib_get_frame_to_node (vnm->vlib_main, l2output_node.index); + else + mirror_frames[i] = vnet_get_frame_to_sw_interface (vnm, i); + } + to_mirror_next = vlib_frame_vector_args (mirror_frames[i]); + to_mirror_next += mirror_frames[i]->n_vectors; + /* This can fail */ + c0 = vlib_buffer_copy (vm, b0); + if (PREDICT_TRUE(c0 != 0)) + { + vnet_buffer (c0)->sw_if_index[VLIB_TX] = i; + c0->flags |= VNET_BUFFER_F_SPAN_CLONE; + if (sf == SPAN_FEAT_L2) + vnet_buffer (c0)->l2.feature_bitmap = L2OUTPUT_FEAT_OUTPUT; + to_mirror_next[0] = vlib_get_buffer_index (vm, c0); + mirror_frames[i]->n_vectors++; + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + span_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); + t->src_sw_if_index = sw_if_index0; + t->mirror_sw_if_index = i; + } + } + })); + /* *INDENT-ON* */ +} + +static_always_inline uword +span_node_inline_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame, vlib_rx_or_tx_t rxtx, + span_feat_t sf) +{ + span_main_t *sm = &span_main; + vnet_main_t *vnm = &vnet_main; + u32 n_left_from, *from, *to_next; + u32 n_span_packets = 0; + u32 next_index; + u32 sw_if_index; + static __thread vlib_frame_t **mirror_frames = 0; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + vec_validate_aligned (mirror_frames, sm->max_sw_if_index, + CLIB_CACHE_LINE_BYTES); + + 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; + u32 bi1; + vlib_buffer_t *b0; + vlib_buffer_t *b1; + u32 sw_if_index0; + u32 next0 = 0; + u32 sw_if_index1; + u32 next1 = 0; + + /* speculatively enqueue b0, b1 to the current next frame */ + to_next[0] = bi0 = from[0]; + to_next[1] = bi1 = from[1]; + to_next += 2; + n_left_to_next -= 2; + from += 2; + n_left_from -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx]; + sw_if_index1 = vnet_buffer (b1)->sw_if_index[rxtx]; + + span_mirror (vm, node, sw_if_index0, b0, mirror_frames, rxtx, sf); + span_mirror (vm, node, sw_if_index1, b1, mirror_frames, rxtx, sf); + + switch (sf) + { + case SPAN_FEAT_L2: + if (rxtx == VLIB_RX) + { + next0 = vnet_l2_feature_next (b0, sm->l2_input_next, + L2INPUT_FEAT_SPAN); + next1 = vnet_l2_feature_next (b1, sm->l2_input_next, + L2INPUT_FEAT_SPAN); + } + else + { + next0 = vnet_l2_feature_next (b0, sm->l2_output_next, + L2OUTPUT_FEAT_SPAN); + next1 = vnet_l2_feature_next (b1, sm->l2_output_next, + L2OUTPUT_FEAT_SPAN); + } + break; + case SPAN_FEAT_DEVICE: + default: + vnet_feature_next (sw_if_index0, &next0, b0); + vnet_feature_next (sw_if_index1, &next1, b1); + break; + } + + /* verify speculative enqueue, maybe switch current next frame */ + 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 sw_if_index0; + u32 next0 = 0; + + /* speculatively enqueue b0 to the current next frame */ + to_next[0] = bi0 = from[0]; + to_next += 1; + n_left_to_next -= 1; + from += 1; + n_left_from -= 1; + + b0 = vlib_get_buffer (vm, bi0); + sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx]; + + span_mirror (vm, node, sw_if_index0, b0, mirror_frames, rxtx, sf); + + switch (sf) + { + case SPAN_FEAT_L2: + if (rxtx == VLIB_RX) + next0 = vnet_l2_feature_next (b0, sm->l2_input_next, + L2INPUT_FEAT_SPAN); + else + next0 = vnet_l2_feature_next (b0, sm->l2_output_next, + L2OUTPUT_FEAT_SPAN); + break; + case SPAN_FEAT_DEVICE: + default: + vnet_feature_next (sw_if_index0, &next0, b0); + break; + } + + /* 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); + } + + + for (sw_if_index = 0; sw_if_index < vec_len (mirror_frames); sw_if_index++) + { + vlib_frame_t *f = mirror_frames[sw_if_index]; + if (f == 0) + continue; + + if (sf == SPAN_FEAT_L2) + vlib_put_frame_to_node (vnm->vlib_main, l2output_node.index, f); + else + vnet_put_frame_to_sw_interface (vnm, sw_if_index, f); + mirror_frames[sw_if_index] = 0; + } + vlib_node_increment_counter (vm, span_node.index, SPAN_ERROR_HITS, + n_span_packets); + + return frame->n_vectors; +} + +static uword +span_device_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return span_node_inline_fn (vm, node, frame, VLIB_RX, SPAN_FEAT_DEVICE); +} + +static uword +span_device_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return span_node_inline_fn (vm, node, frame, VLIB_TX, SPAN_FEAT_DEVICE); +} + +static uword +span_l2_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return span_node_inline_fn (vm, node, frame, VLIB_RX, SPAN_FEAT_L2); +} + +static uword +span_l2_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return span_node_inline_fn (vm, node, frame, VLIB_TX, SPAN_FEAT_L2); +} + +#define span_node_defs \ + .vector_size = sizeof (u32), \ + .format_trace = format_span_trace, \ + .type = VLIB_NODE_TYPE_INTERNAL, \ + .n_errors = ARRAY_LEN(span_error_strings), \ + .error_strings = span_error_strings, \ + .n_next_nodes = 0, \ + .next_nodes = { \ + [0] = "error-drop" \ + } + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (span_input_node) = { + span_node_defs, + .function = span_device_input_node_fn, + .name = "span-input", +}; + +VLIB_NODE_FUNCTION_MULTIARCH (span_input_node, span_device_input_node_fn) + +VLIB_REGISTER_NODE (span_output_node) = { + span_node_defs, + .function = span_device_output_node_fn, + .name = "span-output", +}; + +VLIB_NODE_FUNCTION_MULTIARCH (span_output_node, span_device_output_node_fn) + +VLIB_REGISTER_NODE (span_l2_input_node) = { + span_node_defs, + .function = span_l2_input_node_fn, + .name = "span-l2-input", +}; + +VLIB_NODE_FUNCTION_MULTIARCH (span_l2_input_node, span_l2_input_node_fn) + +VLIB_REGISTER_NODE (span_l2_output_node) = { + span_node_defs, + .function = span_l2_output_node_fn, + .name = "span-l2-output", +}; + +VLIB_NODE_FUNCTION_MULTIARCH (span_l2_output_node, span_l2_output_node_fn) + +clib_error_t *span_init (vlib_main_t * vm) +{ + span_main_t *sm = &span_main; + + sm->vlib_main = vm; + sm->vnet_main = vnet_get_main (); + + /* Initialize the feature next-node indexes */ + feat_bitmap_init_next_nodes (vm, + span_l2_input_node.index, + L2INPUT_N_FEAT, + l2input_get_feat_names (), + sm->l2_input_next); + + feat_bitmap_init_next_nodes (vm, + span_l2_output_node.index, + L2OUTPUT_N_FEAT, + l2output_get_feat_names (), + sm->l2_output_next); + return 0; +} + +VLIB_INIT_FUNCTION (span_init); +/* *INDENT-ON* */ + +#undef span_node_defs +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |