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Diffstat (limited to 'src/vnet/adj/adj_midchain.c')
| -rw-r--r-- | src/vnet/adj/adj_midchain.c | 559 |
1 files changed, 559 insertions, 0 deletions
diff --git a/src/vnet/adj/adj_midchain.c b/src/vnet/adj/adj_midchain.c new file mode 100644 index 00000000000..8c6ab5aa17b --- /dev/null +++ b/src/vnet/adj/adj_midchain.c @@ -0,0 +1,559 @@ +/* + * 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 <vnet/adj/adj_nbr.h> +#include <vnet/adj/adj_internal.h> +#include <vnet/adj/adj_l2.h> +#include <vnet/adj/adj_midchain.h> +#include <vnet/ethernet/arp_packet.h> +#include <vnet/dpo/drop_dpo.h> +#include <vnet/fib/fib_walk.h> + +/** + * The two midchain tx feature node indices + */ +static u32 adj_midchain_tx_feature_node[VNET_LINK_NUM]; +static u32 adj_midchain_tx_no_count_feature_node[VNET_LINK_NUM]; + +/** + * @brief Trace data for packets traversing the midchain tx node + */ +typedef struct adj_midchain_tx_trace_t_ +{ + /** + * @brief the midchain adj we are traversing + */ + adj_index_t ai; +} adj_midchain_tx_trace_t; + +always_inline uword +adj_midchain_tx_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, + int interface_count) +{ + u32 * from, * to_next, n_left_from, n_left_to_next; + u32 next_index; + vnet_main_t *vnm = vnet_get_main (); + vnet_interface_main_t *im = &vnm->interface_main; + u32 cpu_index = vm->cpu_index; + + /* Vector of buffer / pkt indices we're supposed to process */ + from = vlib_frame_vector_args (frame); + + /* Number of buffers / pkts */ + n_left_from = frame->n_vectors; + + /* Speculatively send the first buffer to the last disposition we used */ + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + /* set up to enqueue to our disposition with index = next_index */ + 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, adj_index0, next0; + const ip_adjacency_t * adj0; + const dpo_id_t *dpo0; + vlib_buffer_t * b0; + u32 bi1, adj_index1, next1; + const ip_adjacency_t * adj1; + const dpo_id_t *dpo1; + vlib_buffer_t * b1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t * p2, * p3; + + p2 = vlib_get_buffer (vm, from[2]); + p3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (p2, LOAD); + vlib_prefetch_buffer_header (p3, LOAD); + + CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); + CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); + } + + bi0 = from[0]; + to_next[0] = bi0; + bi1 = from[1]; + to_next[1] = bi1; + + 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); + + /* Follow the DPO on which the midchain is stacked */ + adj_index0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX]; + adj_index1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX]; + + adj0 = adj_get(adj_index0); + adj1 = adj_get(adj_index1); + + dpo0 = &adj0->sub_type.midchain.next_dpo; + dpo1 = &adj1->sub_type.midchain.next_dpo; + + next0 = dpo0->dpoi_next_node; + next1 = dpo1->dpoi_next_node; + + vnet_buffer(b1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index; + vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index; + + if (interface_count) + { + vlib_increment_combined_counter (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_TX, + cpu_index, + adj0->rewrite_header.sw_if_index, + 1, + vlib_buffer_length_in_chain (vm, b0)); + vlib_increment_combined_counter (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_TX, + cpu_index, + adj1->rewrite_header.sw_if_index, + 1, + vlib_buffer_length_in_chain (vm, b1)); + } + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + adj_midchain_tx_trace_t *tr = vlib_add_trace (vm, node, + b0, sizeof (*tr)); + tr->ai = adj_index0; + } + if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) + { + adj_midchain_tx_trace_t *tr = vlib_add_trace (vm, node, + b1, sizeof (*tr)); + tr->ai = adj_index1; + } + + 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, adj_index0, next0; + const ip_adjacency_t * adj0; + const dpo_id_t *dpo0; + vlib_buffer_t * b0; + + 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); + + /* Follow the DPO on which the midchain is stacked */ + adj_index0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX]; + adj0 = adj_get(adj_index0); + dpo0 = &adj0->sub_type.midchain.next_dpo; + next0 = dpo0->dpoi_next_node; + vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index; + + if (interface_count) + { + vlib_increment_combined_counter (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_TX, + cpu_index, + adj0->rewrite_header.sw_if_index, + 1, + vlib_buffer_length_in_chain (vm, b0)); + } + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + adj_midchain_tx_trace_t *tr = vlib_add_trace (vm, node, + b0, sizeof (*tr)); + tr->ai = adj_index0; + } + + 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; +} + +static u8 * +format_adj_midchain_tx_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 *); + adj_midchain_tx_trace_t *tr = va_arg (*args, adj_midchain_tx_trace_t*); + + s = format(s, "adj-midchain:[%d]:%U", tr->ai, + format_ip_adjacency, tr->ai, + FORMAT_IP_ADJACENCY_NONE); + + return (s); +} + +static uword +adj_midchain_tx (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return (adj_midchain_tx_inline(vm, node, frame, 1)); +} + +VLIB_REGISTER_NODE (adj_midchain_tx_node, static) = { + .function = adj_midchain_tx, + .name = "adj-midchain-tx", + .vector_size = sizeof (u32), + + .format_trace = format_adj_midchain_tx_trace, + + .n_next_nodes = 1, + .next_nodes = { + [0] = "error-drop", + }, +}; + +static uword +adj_midchain_tx_no_count (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return (adj_midchain_tx_inline(vm, node, frame, 0)); +} + +VLIB_REGISTER_NODE (adj_midchain_tx_no_count_node, static) = { + .function = adj_midchain_tx_no_count, + .name = "adj-midchain-tx-no-count", + .vector_size = sizeof (u32), + + .format_trace = format_adj_midchain_tx_trace, + + .n_next_nodes = 1, + .next_nodes = { + [0] = "error-drop", + }, +}; + +VNET_FEATURE_INIT (adj_midchain_tx_ip4, static) = { + .arc_name = "ip4-output", + .node_name = "adj-midchain-tx", + .runs_before = VNET_FEATURES ("interface-output"), + .feature_index_ptr = &adj_midchain_tx_feature_node[VNET_LINK_IP4], +}; +VNET_FEATURE_INIT (adj_midchain_tx_no_count_ip4, static) = { + .arc_name = "ip4-output", + .node_name = "adj-midchain-tx-no-count", + .runs_before = VNET_FEATURES ("interface-output"), + .feature_index_ptr = &adj_midchain_tx_no_count_feature_node[VNET_LINK_IP4], +}; +VNET_FEATURE_INIT (adj_midchain_tx_ip6, static) = { + .arc_name = "ip6-output", + .node_name = "adj-midchain-tx", + .runs_before = VNET_FEATURES ("interface-output"), + .feature_index_ptr = &adj_midchain_tx_feature_node[VNET_LINK_IP6], +}; +VNET_FEATURE_INIT (adj_midchain_tx_no_count_ip6, static) = { + .arc_name = "ip6-output", + .node_name = "adj-midchain-tx-no-count", + .runs_before = VNET_FEATURES ("interface-output"), + .feature_index_ptr = &adj_midchain_tx_no_count_feature_node[VNET_LINK_IP6], +}; +VNET_FEATURE_INIT (adj_midchain_tx_mpls, static) = { + .arc_name = "mpls-output", + .node_name = "adj-midchain-tx", + .runs_before = VNET_FEATURES ("interface-output"), + .feature_index_ptr = &adj_midchain_tx_feature_node[VNET_LINK_MPLS], +}; +VNET_FEATURE_INIT (adj_midchain_tx_no_count_mpls, static) = { + .arc_name = "mpls-output", + .node_name = "adj-midchain-tx-no-count", + .runs_before = VNET_FEATURES ("interface-output"), + .feature_index_ptr = &adj_midchain_tx_no_count_feature_node[VNET_LINK_MPLS], +}; +VNET_FEATURE_INIT (adj_midchain_tx_ethernet, static) = { + .arc_name = "ethernet-output", + .node_name = "adj-midchain-tx", + .runs_before = VNET_FEATURES ("error-drop"), + .feature_index_ptr = &adj_midchain_tx_feature_node[VNET_LINK_ETHERNET], +}; +VNET_FEATURE_INIT (adj_midchain_tx_no_count_ethernet, static) = { + .arc_name = "ethernet-output", + .node_name = "adj-midchain-tx-no-count", + .runs_before = VNET_FEATURES ("error-drop"), + .feature_index_ptr = &adj_midchain_tx_no_count_feature_node[VNET_LINK_ETHERNET], +}; + +static inline u32 +adj_get_midchain_node (vnet_link_t link) +{ + switch (link) { + case VNET_LINK_IP4: + return (ip4_midchain_node.index); + case VNET_LINK_IP6: + return (ip6_midchain_node.index); + case VNET_LINK_MPLS: + return (mpls_midchain_node.index); + case VNET_LINK_ETHERNET: + return (adj_l2_midchain_node.index); + case VNET_LINK_ARP: + break; + } + ASSERT(0); + return (0); +} + +static u8 +adj_midchain_get_feature_arc_index_for_link_type (const ip_adjacency_t *adj) +{ + u8 arc = (u8) ~0; + switch (adj->ia_link) + { + case VNET_LINK_IP4: + { + arc = ip4_main.lookup_main.output_feature_arc_index; + break; + } + case VNET_LINK_IP6: + { + arc = ip6_main.lookup_main.output_feature_arc_index; + break; + } + case VNET_LINK_MPLS: + { + arc = mpls_main.output_feature_arc_index; + break; + } + case VNET_LINK_ETHERNET: + { + arc = ethernet_main.output_feature_arc_index; + break; + } + case VNET_LINK_ARP: + ASSERT(0); + break; + } + + ASSERT (arc != (u8) ~0); + + return (arc); +} + +/** + * adj_nbr_midchain_update_rewrite + * + * Update the adjacency's rewrite string. A NULL string implies the + * rewrite is reset (i.e. when ARP/ND etnry is gone). + * NB: the adj being updated may be handling traffic in the DP. + */ +void +adj_nbr_midchain_update_rewrite (adj_index_t adj_index, + adj_midchain_fixup_t fixup, + adj_midchain_flag_t flags, + u8 *rewrite) +{ + ip_adjacency_t *adj; + u8 arc_index; + u32 feature_index; + + ASSERT(ADJ_INDEX_INVALID != adj_index); + + adj = adj_get(adj_index); + + /* + * one time only update. since we don't support chainging the tunnel + * src,dst, this is all we need. + */ + ASSERT(adj->lookup_next_index == IP_LOOKUP_NEXT_ARP); + /* + * tunnels can always provide a rewrite. + */ + ASSERT(NULL != rewrite); + + adj->sub_type.midchain.fixup_func = fixup; + + arc_index = adj_midchain_get_feature_arc_index_for_link_type (adj); + feature_index = (flags & ADJ_MIDCHAIN_FLAG_NO_COUNT) ? + adj_midchain_tx_no_count_feature_node[adj->ia_link] : + adj_midchain_tx_feature_node[adj->ia_link]; + + adj->sub_type.midchain.tx_function_node = (flags & ADJ_MIDCHAIN_FLAG_NO_COUNT) ? + adj_midchain_tx_no_count_node.index : + adj_midchain_tx_node.index; + + vnet_feature_enable_disable_with_index (arc_index, feature_index, + adj->rewrite_header.sw_if_index, + 1 /* enable */, 0, 0); + + /* + * stack the midchain on the drop so it's ready to forward in the adj-midchain-tx. + * The graph arc used/created here is from the midchain-tx node to the + * child's registered node. This is because post adj processing the next + * node are any output features, then the midchain-tx. from there we + * need to get to the stacked child's node. + */ + dpo_stack_from_node(adj->sub_type.midchain.tx_function_node, + &adj->sub_type.midchain.next_dpo, + drop_dpo_get(vnet_link_to_dpo_proto(adj->ia_link))); + + /* + * update the rewirte with the workers paused. + */ + adj_nbr_update_rewrite_internal(adj, + IP_LOOKUP_NEXT_MIDCHAIN, + adj_get_midchain_node(adj->ia_link), + adj->sub_type.midchain.tx_function_node, + rewrite); +} + +/** + * adj_nbr_midchain_unstack + * + * Unstack the adj. stack it on drop + */ +void +adj_nbr_midchain_unstack (adj_index_t adj_index) +{ + ip_adjacency_t *adj; + + ASSERT(ADJ_INDEX_INVALID != adj_index); + + adj = adj_get(adj_index); + + /* + * stack on the drop + */ + dpo_stack(DPO_ADJACENCY_MIDCHAIN, + vnet_link_to_dpo_proto(adj->ia_link), + &adj->sub_type.midchain.next_dpo, + drop_dpo_get(vnet_link_to_dpo_proto(adj->ia_link))); + + CLIB_MEMORY_BARRIER(); +} + +/** + * adj_nbr_midchain_stack + */ +void +adj_nbr_midchain_stack (adj_index_t adj_index, + const dpo_id_t *next) +{ + ip_adjacency_t *adj; + + ASSERT(ADJ_INDEX_INVALID != adj_index); + + adj = adj_get(adj_index); + + ASSERT(IP_LOOKUP_NEXT_MIDCHAIN == adj->lookup_next_index); + + dpo_stack_from_node(adj->sub_type.midchain.tx_function_node, + &adj->sub_type.midchain.next_dpo, + next); +} + +u8* +format_adj_midchain (u8* s, va_list *ap) +{ + index_t index = va_arg(*ap, index_t); + u32 indent = va_arg(*ap, u32); + vnet_main_t * vnm = vnet_get_main(); + ip_adjacency_t * adj = adj_get(index); + + s = format (s, "%U", format_vnet_link, adj->ia_link); + s = format (s, " via %U ", + format_ip46_address, &adj->sub_type.nbr.next_hop); + s = format (s, " %U", + format_vnet_rewrite, + vnm->vlib_main, &adj->rewrite_header, + sizeof (adj->rewrite_data), indent); + s = format (s, "\n%Ustacked-on:\n%U%U", + format_white_space, indent, + format_white_space, indent+2, + format_dpo_id, &adj->sub_type.midchain.next_dpo, indent+2); + + return (s); +} + +static void +adj_dpo_lock (dpo_id_t *dpo) +{ + adj_lock(dpo->dpoi_index); +} +static void +adj_dpo_unlock (dpo_id_t *dpo) +{ + adj_unlock(dpo->dpoi_index); +} + +const static dpo_vft_t adj_midchain_dpo_vft = { + .dv_lock = adj_dpo_lock, + .dv_unlock = adj_dpo_unlock, + .dv_format = format_adj_midchain, +}; + +/** + * @brief The per-protocol VLIB graph nodes that are assigned to a midchain + * object. + * + * this means that these graph nodes are ones from which a midchain is the + * parent object in the DPO-graph. + */ +const static char* const midchain_ip4_nodes[] = +{ + "ip4-midchain", + NULL, +}; +const static char* const midchain_ip6_nodes[] = +{ + "ip6-midchain", + NULL, +}; +const static char* const midchain_mpls_nodes[] = +{ + "mpls-midchain", + NULL, +}; +const static char* const midchain_ethernet_nodes[] = +{ + "adj-l2-midchain", + NULL, +}; + +const static char* const * const midchain_nodes[DPO_PROTO_NUM] = +{ + [DPO_PROTO_IP4] = midchain_ip4_nodes, + [DPO_PROTO_IP6] = midchain_ip6_nodes, + [DPO_PROTO_MPLS] = midchain_mpls_nodes, + [DPO_PROTO_ETHERNET] = midchain_ethernet_nodes, +}; + +void +adj_midchain_module_init (void) +{ + dpo_register(DPO_ADJACENCY_MIDCHAIN, &adj_midchain_dpo_vft, midchain_nodes); +} |