+++ /dev/null
-/*
- * 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.
- */
-/**
- * @file
- * @brief Functions for encapsulating VXLAN GPE tunnels
- *
-*/
-#include <vppinfra/error.h>
-#include <vppinfra/hash.h>
-#include <vnet/vnet.h>
-#include <vnet/ip/ip.h>
-#include <vnet/ethernet/ethernet.h>
-#include <vnet/vxlan-gpe/vxlan_gpe.h>
-
-/** Statistics (not really errors) */
-#define foreach_vxlan_gpe_encap_error \
-_(ENCAPSULATED, "good packets encapsulated")
-
-/**
- * @brief VXLAN GPE encap error strings
- */
-static char * vxlan_gpe_encap_error_strings[] = {
-#define _(sym,string) string,
- foreach_vxlan_gpe_encap_error
-#undef _
-};
-
-/**
- * @brief Struct for VXLAN GPE errors/counters
- */
-typedef enum {
-#define _(sym,str) VXLAN_GPE_ENCAP_ERROR_##sym,
- foreach_vxlan_gpe_encap_error
-#undef _
- VXLAN_GPE_ENCAP_N_ERROR,
-} vxlan_gpe_encap_error_t;
-
-/**
- * @brief Struct for tracing VXLAN GPE encapsulated packets
- */
-typedef struct {
- u32 tunnel_index;
-} vxlan_gpe_encap_trace_t;
-
-/**
- * @brief Trace of packets encapsulated in VXLAN GPE
- *
- * @param *s
- * @param *args
- *
- * @return *s
- *
- */
-u8 * format_vxlan_gpe_encap_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 *);
- vxlan_gpe_encap_trace_t * t
- = va_arg (*args, vxlan_gpe_encap_trace_t *);
-
- s = format (s, "VXLAN-GPE-ENCAP: tunnel %d", t->tunnel_index);
- return s;
-}
-
-/**
- * @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4|6 lookup
- *
- * @param *ngm
- * @param *b0
- * @param *t0 contains rewrite header
- * @param *next0 relative index of next dispatch function (next node)
- * @param is_v4 Is this IPv4? (or IPv6)
- *
- */
-always_inline void
-vxlan_gpe_encap_one_inline (vxlan_gpe_main_t * ngm, vlib_buffer_t * b0,
- vxlan_gpe_tunnel_t * t0, u32 * next0,
- u8 is_v4)
-{
- ASSERT(sizeof(ip4_vxlan_gpe_header_t) == 36);
- ASSERT(sizeof(ip6_vxlan_gpe_header_t) == 56);
-
- ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, is_v4);
- next0[0] = t0->encap_next_node;
-}
-
-/**
- * @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4|6 lookup for two packets
- *
- * @param *ngm
- * @param *b0 Packet0
- * @param *b1 Packet1
- * @param *t0 contains rewrite header for Packet0
- * @param *t1 contains rewrite header for Packet1
- * @param *next0 relative index of next dispatch function (next node) for Packet0
- * @param *next1 relative index of next dispatch function (next node) for Packet1
- * @param is_v4 Is this IPv4? (or IPv6)
- *
- */
-always_inline void
-vxlan_gpe_encap_two_inline (vxlan_gpe_main_t * ngm, vlib_buffer_t * b0,
- vlib_buffer_t * b1, vxlan_gpe_tunnel_t * t0,
- vxlan_gpe_tunnel_t * t1, u32 * next0,
- u32 * next1, u8 is_v4)
-{
- ASSERT(sizeof(ip4_vxlan_gpe_header_t) == 36);
- ASSERT(sizeof(ip6_vxlan_gpe_header_t) == 56);
-
- ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, is_v4);
- ip_udp_encap_one (ngm->vlib_main, b1, t1->rewrite, t1->rewrite_size, is_v4);
- next0[0] = next1[0] = t0->encap_next_node;
-}
-
-/**
- * @brief Common processing for IPv4 and IPv6 VXLAN GPE encap dispatch functions
- *
- * It is worth noting that other than trivial UDP forwarding (transit), VXLAN GPE
- * tunnels are "establish local". This means that we don't have a TX interface as yet
- * as we need to look up where the outer-header dest is. By setting the TX index in the
- * buffer metadata to the encap FIB, we can do a lookup to get the adjacency and real TX.
- *
- * vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
- *
- * @node vxlan-gpe-input
- * @param *vm
- * @param *node
- * @param *from_frame
- *
- * @return from_frame->n_vectors
- *
- */
-static uword
-vxlan_gpe_encap (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
-{
- u32 n_left_from, next_index, *from, *to_next;
- vxlan_gpe_main_t * ngm = &vxlan_gpe_main;
- vnet_main_t * vnm = ngm->vnet_main;
- vnet_interface_main_t * im = &vnm->interface_main;
- u32 pkts_encapsulated = 0;
- u32 cpu_index = os_get_cpu_number ();
- u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
-
- from = vlib_frame_vector_args (from_frame);
- n_left_from = from_frame->n_vectors;
-
- next_index = node->cached_next_index;
- stats_sw_if_index = node->runtime_data[0];
- stats_n_packets = stats_n_bytes = 0;
-
- 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;
- u32 next0, next1;
- u32 sw_if_index0, sw_if_index1, len0, len1;
- vnet_hw_interface_t * hi0, *hi1;
- vxlan_gpe_tunnel_t * t0, *t1;
- u8 is_ip4_0, is_ip4_1;
-
- next0 = next1 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;
-
- /* 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, 2*CLIB_CACHE_LINE_BYTES, LOAD);
- CLIB_PREFETCH(p3->data, 2*CLIB_CACHE_LINE_BYTES, 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);
-
- /* 1-wide cache? */
- sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
- sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
- hi0 = vnet_get_sup_hw_interface (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);
- hi1 = vnet_get_sup_hw_interface (vnm, vnet_buffer(b1)->sw_if_index[VLIB_TX]);
-
- t0 = pool_elt_at_index(ngm->tunnels, hi0->dev_instance);
- t1 = pool_elt_at_index(ngm->tunnels, hi1->dev_instance);
-
- is_ip4_0 = (t0->flags & VXLAN_GPE_TUNNEL_IS_IPV4);
- is_ip4_1 = (t1->flags & VXLAN_GPE_TUNNEL_IS_IPV4);
-
- if (PREDICT_TRUE(is_ip4_0 == is_ip4_1))
- {
- vxlan_gpe_encap_two_inline (ngm, b0, b1, t0, t1, &next0, &next1,is_ip4_0);
- }
- else
- {
- vxlan_gpe_encap_one_inline (ngm, b0, t0, &next0, is_ip4_0);
- vxlan_gpe_encap_one_inline (ngm, b1, t1, &next1, is_ip4_1);
- }
-
- /* Reset to look up tunnel partner in the configured FIB */
- vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
- vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->encap_fib_index;
- vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
- vnet_buffer(b1)->sw_if_index[VLIB_RX] = sw_if_index1;
- pkts_encapsulated += 2;
-
- len0 = vlib_buffer_length_in_chain (vm, b0);
- len1 = vlib_buffer_length_in_chain (vm, b0);
- stats_n_packets += 2;
- stats_n_bytes += len0 + len1;
-
- /* Batch stats increment on the same vxlan tunnel so counter is not
- incremented per packet. Note stats are still incremented for deleted
- and admin-down tunnel where packets are dropped. It is not worthwhile
- to check for this rare case and affect normal path performance. */
- if (PREDICT_FALSE((sw_if_index0 != stats_sw_if_index)
- || (sw_if_index1 != stats_sw_if_index)))
- {
- stats_n_packets -= 2;
- stats_n_bytes -= len0 + len1;
- if (sw_if_index0 == sw_if_index1)
- {
- if (stats_n_packets)
- vlib_increment_combined_counter (
- im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
- cpu_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
- stats_sw_if_index = sw_if_index0;
- stats_n_packets = 2;
- stats_n_bytes = len0 + len1;
- }
- else
- {
- vlib_increment_combined_counter (
- im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
- cpu_index, sw_if_index0, 1, len0);
- vlib_increment_combined_counter (
- im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
- cpu_index, sw_if_index1, 1, len1);
- }
- }
-
- if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof(*tr));
- tr->tunnel_index = t0 - ngm->tunnels;
- }
-
- if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
- {
- vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b1,
- sizeof(*tr));
- tr->tunnel_index = t1 - ngm->tunnels;
- }
-
- 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 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;
- u32 sw_if_index0, len0;
- vnet_hw_interface_t * hi0;
- vxlan_gpe_tunnel_t * t0;
- u8 is_ip4_0;
-
- 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);
-
- /* 1-wide cache? */
- sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
- hi0 = vnet_get_sup_hw_interface (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);
-
- t0 = pool_elt_at_index(ngm->tunnels, hi0->dev_instance);
-
- is_ip4_0 = (t0->flags & VXLAN_GPE_TUNNEL_IS_IPV4);
-
- vxlan_gpe_encap_one_inline (ngm, b0, t0, &next0, is_ip4_0);
-
- /* Reset to look up tunnel partner in the configured FIB */
- vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
- vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
- pkts_encapsulated++;
-
- len0 = vlib_buffer_length_in_chain (vm, b0);
- stats_n_packets += 1;
- stats_n_bytes += len0;
-
- /* Batch stats increment on the same vxlan tunnel so counter is not
- * incremented per packet. Note stats are still incremented for deleted
- * and admin-down tunnel where packets are dropped. It is not worthwhile
- * to check for this rare case and affect normal path performance. */
- if (PREDICT_FALSE(sw_if_index0 != stats_sw_if_index))
- {
- stats_n_packets -= 1;
- stats_n_bytes -= len0;
- if (stats_n_packets)
- vlib_increment_combined_counter (
- im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
- cpu_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
- stats_n_packets = 1;
- stats_n_bytes = len0;
- stats_sw_if_index = sw_if_index0;
- }
- if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b0,
- sizeof(*tr));
- tr->tunnel_index = t0 - ngm->tunnels;
- }
- 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);
- }
- vlib_node_increment_counter (vm, node->node_index,
- VXLAN_GPE_ENCAP_ERROR_ENCAPSULATED,
- pkts_encapsulated);
- /* Increment any remaining batch stats */
- if (stats_n_packets)
- {
- vlib_increment_combined_counter (
- im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, cpu_index,
- stats_sw_if_index, stats_n_packets, stats_n_bytes);
- node->runtime_data[0] = stats_sw_if_index;
- }
-
- return from_frame->n_vectors;
-}
-
-VLIB_REGISTER_NODE (vxlan_gpe_encap_node) = {
- .function = vxlan_gpe_encap,
- .name = "vxlan-gpe-encap",
- .vector_size = sizeof (u32),
- .format_trace = format_vxlan_gpe_encap_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
-
- .n_errors = ARRAY_LEN(vxlan_gpe_encap_error_strings),
- .error_strings = vxlan_gpe_encap_error_strings,
-
- .n_next_nodes = VXLAN_GPE_ENCAP_N_NEXT,
-
- .next_nodes = {
- [VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
- [VXLAN_GPE_ENCAP_NEXT_IP6_LOOKUP] = "ip6-lookup",
- [VXLAN_GPE_ENCAP_NEXT_DROP] = "error-drop",
- },
-};
-
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