diff options
Diffstat (limited to 'vnet/vnet/l2/l2_output.c')
| -rw-r--r-- | vnet/vnet/l2/l2_output.c | 541 |
1 files changed, 541 insertions, 0 deletions
diff --git a/vnet/vnet/l2/l2_output.c b/vnet/vnet/l2/l2_output.c new file mode 100644 index 00000000000..72c3d0374e3 --- /dev/null +++ b/vnet/vnet/l2/l2_output.c @@ -0,0 +1,541 @@ +/* + * l2_output.c : layer 2 output packet processing + * + * 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 <vlib/cli.h> + +#include <vppinfra/error.h> +#include <vppinfra/hash.h> +#include <vnet/l2/feat_bitmap.h> +#include <vnet/l2/l2_output.h> + + +// Feature graph node names +static char * l2output_feat_names[] = { +#define _(sym,name) name, + foreach_l2output_feat +#undef _ +}; + +char **l2output_get_feat_names(void) { + return l2output_feat_names; +} + +l2output_main_t l2output_main; + +typedef struct { + /* per-pkt trace data */ + u8 src[6]; + u8 dst[6]; + u32 sw_if_index; +} l2output_trace_t; + +/* packet trace format function */ +static u8 * format_l2output_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 *); + l2output_trace_t * t = va_arg (*args, l2output_trace_t *); + + s = format (s, "l2-output: sw_if_index %d dst %U src %U", + t->sw_if_index, + format_ethernet_address, t->dst, + format_ethernet_address, t->src); + return s; +} + + +#define foreach_l2output_error \ +_(L2OUTPUT, "L2 output packets") \ +_(EFP_DROP, "L2 EFP filter pre-rewrite drops") \ +_(VTR_DROP, "L2 output tag rewrite drops") \ +_(SHG_DROP, "L2 split horizon drops") \ +_(DROP, "L2 output drops") + +typedef enum { +#define _(sym,str) L2OUTPUT_ERROR_##sym, + foreach_l2output_error +#undef _ + L2OUTPUT_N_ERROR, +} l2output_error_t; + +static char * l2output_error_strings[] = { +#define _(sym,string) string, + foreach_l2output_error +#undef _ +}; + +typedef enum { + L2OUTPUT_NEXT_DROP, + L2OUTPUT_N_NEXT, +} l2output_next_t; + +// Return 0 if split horizon check passes, otherwise return non-zero +// Packets should not be transmitted out an interface with the same +// split-horizon group as the input interface, except if the shg is 0 +// in which case the check always passes. +static_always_inline u32 +split_horizon_violation (u8 shg1, u8 shg2) +{ + if (PREDICT_TRUE (shg1 == 0)) { + return 0; + } else { + return shg1 == shg2; + } +} + + +static uword +l2output_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, * from, * to_next; + l2output_next_t next_index; + l2output_main_t * msm = &l2output_main; + vlib_node_t *n = vlib_get_node (vm, l2output_node.index); + u32 node_counter_base_index = n->error_heap_index; + vlib_error_main_t * em = &vm->error_main; + u32 cached_sw_if_index; + u32 cached_next_index; + + /* Invalidate cache */ + cached_sw_if_index = ~0; + cached_next_index = ~0; /* warning be gone */ + + 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 >= 6 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t * b0, * b1; + u32 next0, next1; + u32 sw_if_index0, sw_if_index1; + ethernet_header_t * h0, * h1; + l2_output_config_t * config0, * config1; + u32 feature_bitmap0, feature_bitmap1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t * p2, * p3, * p4 , * p5; + u32 sw_if_index2, sw_if_index3; + + p2 = vlib_get_buffer (vm, from[2]); + p3 = vlib_get_buffer (vm, from[3]); + p4 = vlib_get_buffer (vm, from[4]); + p5 = vlib_get_buffer (vm, from[5]); + + // Prefetch the buffer header for the N+2 loop iteration + vlib_prefetch_buffer_header (p4, LOAD); + vlib_prefetch_buffer_header (p5, LOAD); + // Note: no need to prefetch packet data. This node doesn't reference it. + + // Prefetch the input config for the N+1 loop iteration + // This depends on the buffer header above + sw_if_index2 = vnet_buffer(p2)->sw_if_index[VLIB_TX]; + sw_if_index3 = vnet_buffer(p3)->sw_if_index[VLIB_TX]; + CLIB_PREFETCH (&msm->configs[sw_if_index2], CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (&msm->configs[sw_if_index3], CLIB_CACHE_LINE_BYTES, LOAD); + } + + /* speculatively enqueue b0 and b1 to the current next frame */ + /* bi is "buffer index", b is pointer to the buffer */ + to_next[0] = bi0 = from[0]; + to_next[1] = bi1 = from[1]; + from += 2; + to_next += 2; + n_left_from -= 2; + n_left_to_next -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + /* TX interface handles */ + sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX]; + sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX]; + + if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE))) + { + h0 = vlib_buffer_get_current (b0); + h1 = vlib_buffer_get_current (b1); + if (b0->flags & VLIB_BUFFER_IS_TRACED) + { + l2output_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = sw_if_index0; + memcpy(t->src, h0->src_address, 6); + memcpy(t->dst, h0->dst_address, 6); + } + if (b1->flags & VLIB_BUFFER_IS_TRACED) + { + l2output_trace_t *t = + vlib_add_trace (vm, node, b1, sizeof (*t)); + t->sw_if_index = sw_if_index1; + memcpy(t->src, h1->src_address, 6); + memcpy(t->dst, h1->dst_address, 6); + } + } + + em->counters[node_counter_base_index + L2OUTPUT_ERROR_L2OUTPUT] += 2; + + // Get config for the output interface + config0 = vec_elt_at_index(msm->configs, sw_if_index0); + config1 = vec_elt_at_index(msm->configs, sw_if_index1); + + // Get features from the config + // TODO: mask out any non-applicable features + feature_bitmap0 = config0->feature_bitmap; + feature_bitmap1 = config1->feature_bitmap; + + // Determine next node + l2_output_dispatch (msm->vlib_main, + msm->vnet_main, + node, + l2output_node.index, + &cached_sw_if_index, + &cached_next_index, + &msm->next_nodes, + b0, + sw_if_index0, + feature_bitmap0, + &next0); + + l2_output_dispatch (msm->vlib_main, + msm->vnet_main, + node, + l2output_node.index, + &cached_sw_if_index, + &cached_next_index, + &msm->next_nodes, + b1, + sw_if_index1, + feature_bitmap1, + &next1); + + // Perform output vlan tag rewrite and the pre-vtr EFP filter check. + // The EFP Filter only needs to be run if there is an output VTR + // configured. The flag for the post-vtr EFP Filter node is used + // to trigger the pre-vtr check as well. + + if (PREDICT_FALSE (config0->output_vtr.push_and_pop_bytes)) { + // Perform pre-vtr EFP filter check if configured + u32 failed1 = (feature_bitmap0 & L2OUTPUT_FEAT_EFP_FILTER) && + (l2_efp_filter_process(b0, &(config0->input_vtr))); + u32 failed2 = l2_vtr_process(b0, &(config0->output_vtr)); + + if (PREDICT_FALSE (failed1 | failed2)) { + next0 = L2OUTPUT_NEXT_DROP; + if (failed2) { + b0->error = node->errors[L2OUTPUT_ERROR_VTR_DROP]; + } + if (failed1) { + b0->error = node->errors[L2OUTPUT_ERROR_EFP_DROP]; + } + } + } + + if (PREDICT_FALSE (config1->output_vtr.push_and_pop_bytes)) { + // Perform pre-vtr EFP filter check if configured + u32 failed1 = (feature_bitmap1 & L2OUTPUT_FEAT_EFP_FILTER) && + (l2_efp_filter_process(b1, &(config1->input_vtr))); + u32 failed2 = l2_vtr_process(b1, &(config1->output_vtr)); + + if (PREDICT_FALSE (failed1 | failed2)) { + next1 = L2OUTPUT_NEXT_DROP; + if (failed2) { + b1->error = node->errors[L2OUTPUT_ERROR_VTR_DROP]; + } + if (failed1) { + b1->error = node->errors[L2OUTPUT_ERROR_EFP_DROP]; + } + } + } + + // Perform the split horizon check + // The check can only fail for non-zero shg's + if (PREDICT_FALSE (config0->shg + config1->shg)) { + // one of the checks might fail, check both + if (split_horizon_violation (config0->shg, vnet_buffer(b0)->l2.shg)) { + next0 = L2OUTPUT_NEXT_DROP; + b0->error = node->errors[L2OUTPUT_ERROR_SHG_DROP]; + } + if (split_horizon_violation (config1->shg, vnet_buffer(b1)->l2.shg)) { + next1 = L2OUTPUT_NEXT_DROP; + b1->error = node->errors[L2OUTPUT_ERROR_SHG_DROP]; + } + } + + /* verify speculative enqueues, maybe switch current next frame */ + /* if next0==next1==next_index then nothing special needs to be done */ + 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 next0; + u32 sw_if_index0; + ethernet_header_t * h0; + l2_output_config_t *config0; + u32 feature_bitmap0; + + /* 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); + + sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX]; + + if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) { + l2output_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = sw_if_index0; + h0 = vlib_buffer_get_current (b0); + memcpy(t->src, h0->src_address, 6); + memcpy(t->dst, h0->dst_address, 6); + } + + em->counters[node_counter_base_index + L2OUTPUT_ERROR_L2OUTPUT] += 1; + + // Get config for the output interface + config0 = vec_elt_at_index(msm->configs, sw_if_index0); + + // Get features from the config + // TODO: mask out any non-applicable features + feature_bitmap0 = config0->feature_bitmap; + + // Determine next node + l2_output_dispatch (msm->vlib_main, + msm->vnet_main, + node, + l2output_node.index, + &cached_sw_if_index, + &cached_next_index, + &msm->next_nodes, + b0, + sw_if_index0, + feature_bitmap0, + &next0); + + // Perform output vlan tag rewrite and the pre-vtr EFP filter check. + // The EFP Filter only needs to be run if there is an output VTR + // configured. The flag for the post-vtr EFP Filter node is used + // to trigger the pre-vtr check as well. + + if (config0->output_vtr.push_and_pop_bytes) { + // Perform pre-vtr EFP filter check if configured + u32 failed1 = (feature_bitmap0 & L2OUTPUT_FEAT_EFP_FILTER) && + (l2_efp_filter_process(b0, &(config0->input_vtr))); + u32 failed2 = l2_vtr_process(b0, &(config0->output_vtr)); + + if (PREDICT_FALSE (failed1 | failed2)) { + next0 = L2OUTPUT_NEXT_DROP; + if (failed2) { + b0->error = node->errors[L2OUTPUT_ERROR_VTR_DROP]; + } + if (failed1) { + b0->error = node->errors[L2OUTPUT_ERROR_EFP_DROP]; + } + } + } + + // Perform the split horizon check + if (PREDICT_FALSE (split_horizon_violation (config0->shg, vnet_buffer(b0)->l2.shg))) { + next0 = L2OUTPUT_NEXT_DROP; + b0->error = node->errors[L2OUTPUT_ERROR_SHG_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; +} + + +VLIB_REGISTER_NODE (l2output_node) = { + .function = l2output_node_fn, + .name = "l2-output", + .vector_size = sizeof (u32), + .format_trace = format_l2output_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(l2output_error_strings), + .error_strings = l2output_error_strings, + + .n_next_nodes = L2OUTPUT_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [L2OUTPUT_NEXT_DROP] = "error-drop", + }, +}; + +clib_error_t *l2output_init (vlib_main_t *vm) +{ + l2output_main_t * mp = &l2output_main; + + mp->vlib_main = vm; + mp->vnet_main = vnet_get_main(); + + // Create the config vector + vec_validate(mp->configs, 100); + // Until we hook up the CLI config, just create 100 sw interface entries and zero them + + // Initialize the feature next-node indexes + feat_bitmap_init_next_nodes(vm, + l2output_node.index, + L2OUTPUT_N_FEAT, + l2output_get_feat_names(), + mp->next_nodes.feat_next_node_index); + + // Initialize the output node mapping table + l2output_init_output_node_vec(&mp->next_nodes.output_node_index_vec); + + return 0; +} + +VLIB_INIT_FUNCTION (l2output_init); + +typedef struct { + u32 node_index; + u32 sw_if_index; +} output_node_mapping_rpc_args_t; + +#if DPDK > 0 +static void output_node_rpc_callback +( output_node_mapping_rpc_args_t * a); + +static void output_node_mapping_send_rpc +(u32 node_index, + u32 sw_if_index) +{ + output_node_mapping_rpc_args_t args; + + args.node_index = node_index; + args.sw_if_index = sw_if_index; + + vl_api_rpc_call_main_thread (output_node_rpc_callback, + (u8 *) &args, sizeof (args)); +} +#endif + + +// Create a mapping in the next node mapping table for the given sw_if_index +u32 l2output_create_output_node_mapping ( + vlib_main_t * vlib_main, + vnet_main_t * vnet_main, + u32 node_index, // index of current node + u32 * output_node_index_vec, + u32 sw_if_index) { + + u32 next; // index of next graph node + vnet_hw_interface_t *hw0; + u32 *node; +#if DPDK > 0 + uword cpu_number; + + cpu_number = os_get_cpu_number(); + + if (cpu_number) + { + output_node_mapping_send_rpc (node_index, sw_if_index); + return 0; + } +#endif + + hw0 = vnet_get_sup_hw_interface (vnet_main, sw_if_index); + + // dynamically create graph node arc + next = vlib_node_add_next (vlib_main, + node_index, + hw0->output_node_index); + + // Initialize vector with the mapping + + node = vec_elt_at_index(output_node_index_vec, sw_if_index); + *node = next; + + return next; +} + +#if DPDK > 0 +void output_node_rpc_callback (output_node_mapping_rpc_args_t *a) +{ + vlib_main_t * vm = vlib_get_main(); + vnet_main_t * vnm = vnet_get_main(); + l2output_main_t * mp = &l2output_main; + + (void) l2output_create_output_node_mapping + (vm, vnm, a->node_index, mp->next_nodes.output_node_index_vec, + a->sw_if_index); +} +#endif + +// Get a pointer to the config for the given interface +l2_output_config_t * l2output_intf_config (u32 sw_if_index) +{ + l2output_main_t * mp = &l2output_main; + + vec_validate(mp->configs, sw_if_index); + return vec_elt_at_index(mp->configs, sw_if_index); +} + +// Enable (or disable) the feature in the bitmap for the given interface +void l2output_intf_bitmap_enable (u32 sw_if_index, + u32 feature_bitmap, + u32 enable) +{ + l2output_main_t * mp = &l2output_main; + l2_output_config_t *config; + + vec_validate(mp->configs, sw_if_index); + config = vec_elt_at_index(mp->configs, sw_if_index); + + if (enable) { + config->feature_bitmap |= feature_bitmap; + } else { + config->feature_bitmap &= ~feature_bitmap; + } +} |