--- /dev/null
+/*
+ * 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;
+ }
+}
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