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vr_ip_mtrie.c
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vr_ip_mtrie.c
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/*
* vr_ip_mtrie.c -- VRF mtrie management
*
* Copyright (c) 2014 Juniper Networks, Inc. All rights reserved.
*/
#include <vr_os.h>
#include "vr_sandesh.h"
#include "vr_message.h"
#include "vr_packet.h"
#include "vr_interface.h"
#include "vr_route.h"
#include "vr_bridge.h"
#include "vr_datapath.h"
#include "vr_ip_mtrie.h"
extern unsigned int vr_vrfs;
extern struct vr_nexthop *ip4_default_nh;
static struct vr_vrf_stats **mtrie_vrf_stats;
static struct vr_vrf_stats *invalid_vrf_stats;
struct vr_nexthop *(*vr_inet_route_lookup)(unsigned int, struct vr_route_req *);
struct vr_vrf_stats *(*vr_inet_vrf_stats)(int, unsigned int);
static struct ip_mtrie *mtrie_alloc_vrf(unsigned int, unsigned int);
/* mtrie specific, bucket_info for v4 and v6 */
#define IP4_BKT_LEVELS (IP4_PREFIX_LEN / IPBUCKET_LEVEL_BITS)
#define IP6_BKT_LEVELS (IP6_PREFIX_LEN / IPBUCKET_LEVEL_BITS)
struct mtrie_bkt_info ip4_bkt_info[IP4_BKT_LEVELS];
struct mtrie_bkt_info ip6_bkt_info[IP6_BKT_LEVELS];
struct ip_mtrie **vn_rtable[2];
static int algo_init_done = 0;
static vr_route_req dump_resp;
static void
mtrie_ip_bkt_info_init(struct mtrie_bkt_info *ip_bkt_info, int pfx_len)
{
int level;
ip_bkt_info[0].bi_bits = IPBUCKET_LEVEL_BITS;
ip_bkt_info[0].bi_pfx_len = IPBUCKET_LEVEL_BITS;
ip_bkt_info[0].bi_shift = pfx_len - IPBUCKET_LEVEL_BITS;
ip_bkt_info[0].bi_size = IPBUCKET_LEVEL_SIZE;
ip_bkt_info[0].bi_mask = IPBUCKET_LEVEL_MASK;
for (level = 1; level < (pfx_len/IPBUCKET_LEVEL_BITS); level++) {
ip_bkt_info[level].bi_bits = IPBUCKET_LEVEL_BITS;
ip_bkt_info[level].bi_pfx_len = ip_bkt_info[level-1].bi_pfx_len
+ IPBUCKET_LEVEL_BITS;
ip_bkt_info[level].bi_shift = ip_bkt_info[level-1].bi_shift - IPBUCKET_LEVEL_BITS;
ip_bkt_info[level].bi_size = IPBUCKET_LEVEL_SIZE;
ip_bkt_info[level].bi_mask = IPBUCKET_LEVEL_MASK;
}
}
/*
* given a vrf id, get the routing table corresponding to the id
*/
static inline struct ip_mtrie *
vrfid_to_mtrie(unsigned int vrf_id, unsigned int family)
{
int index = 0;
struct ip_mtrie **mtrie_table;
if (vrf_id >= vr_vrfs)
return NULL;
if (family == AF_INET6)
index = 1;
mtrie_table = vn_rtable[index];
return mtrie_table[vrf_id];
}
#define PREFIX_TO_INDEX(prefix, level) (prefix[level])
static inline unsigned int
ip_bkt_get_max_level(int family)
{
if (family == AF_INET6)
return(IP6_BKT_LEVELS);
else
return(IP4_BKT_LEVELS);
}
static struct mtrie_bkt_info *
ip_bkt_info_get(unsigned int family)
{
if (family == AF_INET6)
return ip6_bkt_info;
else
return ip4_bkt_info;
}
/*
* we have to be careful about 'level' here. assumption is that level
* will be passed sane from whomever is calling
*/
static inline unsigned char
rt_to_index(struct vr_route_req *rt, unsigned int level)
{
return PREFIX_TO_INDEX(rt->rtr_req.rtr_prefix, level);
}
static inline struct ip_bucket_entry *
index_to_entry(struct ip_bucket *bkt, int index)
{
return &bkt->bkt_data[index];
}
static void
set_entry_to_bucket(struct ip_bucket_entry *ent, struct ip_bucket *bkt)
{
struct vr_nexthop *tmp_nh;
/* save old... */
tmp_nh = ent->entry_nh_p;
/* update... */
ent->entry_long_i = (unsigned long)bkt | 0x1ul;
/* release old */
if (tmp_nh)
vrouter_put_nexthop(tmp_nh);
return;
}
/*
* the nh pointer is something which will be retained. So, call this function
* with an nh * that you are willing to forget about in your function
*/
static void
set_entry_to_nh(struct ip_bucket_entry *entry, struct vr_nexthop *nh)
{
struct vr_nexthop *tmp_nh;
tmp_nh = vrouter_get_nexthop(nh->nh_rid, nh->nh_id);
if (tmp_nh != nh) {
/*
* if the original nexthop was deleted, then there are
* two cases
*
* 1. no new nexthop was created (& hence the null check)
* 2. new nexthop has taken it's place (in which case, we need to
* put the reference we took above
*/
if (tmp_nh)
vrouter_put_nexthop(tmp_nh);
nh = vrouter_get_nexthop(nh->nh_rid, NH_DISCARD_ID);
}
/* save the original */
tmp_nh = entry->entry_nh_p;
/* update the entry */
entry->entry_nh_p = nh;
/* ...and then take steps to release original */
if (tmp_nh && PTR_IS_NEXTHOP((unsigned long)(tmp_nh))) {
vrouter_put_nexthop(tmp_nh);
}
return;
}
static inline struct ip_bucket *
entry_to_bucket(struct ip_bucket_entry *ent)
{
unsigned long long_i = ent->entry_long_i;
if (PTR_IS_BUCKET(long_i))
return (struct ip_bucket *)(long_i & ~0x1UL);
return NULL;
}
static void
mtrie_free_entry(struct ip_bucket_entry *entry, unsigned int level)
{
unsigned int i;
struct ip_bucket *bkt;
if (ENTRY_IS_NEXTHOP(entry)) {
vrouter_put_nexthop(entry->entry_nh_p);
entry->entry_nh_p = NULL;
return;
}
bkt = entry_to_bucket(entry);
if (!bkt)
return;
for (i = 0; i < IPBUCKET_LEVEL_SIZE; i++) {
if (ENTRY_IS_BUCKET(&bkt->bkt_data[i])) {
mtrie_free_entry(&bkt->bkt_data[i], level + 1);
} else {
if (bkt->bkt_data[i].entry_nh_p) {
vrouter_put_nexthop(bkt->bkt_data[i].entry_nh_p);
}
}
}
entry->entry_bkt_p = NULL;
vr_free(bkt, VR_MTRIE_BUCKET_OBJECT);
return;
}
static void
mtrie_free_bkt(struct ip_bucket *bkt)
{
unsigned int i;
for (i = 0; i < IPBUCKET_LEVEL_SIZE; i++) {
mtrie_free_entry(&bkt->bkt_data[i], 0);
}
vr_free(bkt, VR_MTRIE_BUCKET_OBJECT);
return;
}
static void
mtrie_free_bkt_cb(struct vrouter *router, void *data)
{
struct vr_defer_data *vdd = (struct vr_defer_data *)data;
if (!vdd)
return;
mtrie_free_bkt((struct ip_bucket *)(vdd->vdd_data));
return;
}
static int
mtrie_free_bkt_defer(struct vrouter *router, struct ip_bucket *bkt)
{
struct vr_defer_data *defer;
defer = vr_get_defer_data(sizeof(*defer));
if (!defer)
return -ENOMEM;
defer->vdd_data = bkt;
vr_defer(router, mtrie_free_bkt_cb, (void *)defer);
return 0;
}
static void
mtrie_delete_bkt(struct ip_bucket_entry *ent, struct vr_route_req *rt)
{
struct ip_bucket *bkt;
if (ENTRY_IS_NEXTHOP(ent)) {
vrouter_put_nexthop(ent->entry_nh_p);
ent->entry_nh_p = NULL;
return;
}
bkt = entry_to_bucket(ent);
set_entry_to_nh(ent, rt->rtr_nh);
ent->entry_label_flags = rt->rtr_req.rtr_label_flags;
ent->entry_label = rt->rtr_req.rtr_label;
ent->entry_bridge_index = rt->rtr_req.rtr_index;
if (!vr_not_ready) {
if (!mtrie_free_bkt_defer(rt->rtr_nh->nh_router, bkt))
return;
vr_delay_op();
}
mtrie_free_bkt(bkt);
return;
}
/*
* alloc a mtrie bucket
*/
static struct ip_bucket *
mtrie_alloc_bucket(struct mtrie_bkt_info *ip_bkt_info, unsigned char level, struct ip_bucket_entry *parent)
{
unsigned int bkt_size;
unsigned int i;
struct ip_bucket *bkt;
struct ip_bucket_entry *ent;
bkt_size = ip_bkt_info[level].bi_size;
bkt = vr_zalloc(sizeof(struct ip_bucket)
+ sizeof(struct ip_bucket_entry) * bkt_size,
VR_MTRIE_BUCKET_OBJECT);
if (!bkt)
return NULL;
for (i = 0; i < bkt_size; i++) {
ent = &bkt->bkt_data[i];
set_entry_to_nh(ent, parent->entry_nh_p);
ent->entry_prefix_len = parent->entry_prefix_len;
ent->entry_label_flags = parent->entry_label_flags;
ent->entry_label = parent->entry_label;
ent->entry_bridge_index = parent->entry_bridge_index;
}
return bkt;
}
static void
add_to_tree(struct ip_bucket_entry *ent, int level, struct vr_route_req *rt)
{
unsigned int i;
struct ip_bucket *bkt;
struct mtrie_bkt_info *ip_bkt_info;
if (level >= (ip_bkt_get_max_level(rt->rtr_req.rtr_family) - 1))
/* assert here ? */
return;
ip_bkt_info = ip_bkt_info_get(rt->rtr_req.rtr_family);
/* assured that the first one is a bucket */
bkt = entry_to_bucket(ent);
level++;
for (i = 0; i < ip_bkt_info[level].bi_size; i++) {
ent = index_to_entry(bkt, i);
if (!ENTRY_IS_NEXTHOP(ent))
add_to_tree(ent, level, rt);
else if (ent->entry_prefix_len <= rt->rtr_req.rtr_prefix_len) {
/* a less specific entry, which needs to be replaced */
set_entry_to_nh(ent, rt->rtr_nh);
ent->entry_prefix_len = rt->rtr_req.rtr_prefix_len;
ent->entry_label_flags = rt->rtr_req.rtr_label_flags;
ent->entry_label = rt->rtr_req.rtr_label;
ent->entry_bridge_index = rt->rtr_req.rtr_index;
}
}
return;
}
static void
mtrie_reset_entry(struct ip_bucket_entry *ent, int level,
struct vr_nexthop *nh)
{
struct ip_bucket_entry cp_ent;
struct ip_bucket *bkt;
memcpy(&cp_ent, ent, sizeof(cp_ent));
/* remove from the tree */
if (nh)
set_entry_to_nh(ent, nh);
/* ...and then work with the copy */
bkt = entry_to_bucket(&cp_ent);
if (!bkt)
return;
if (!vr_not_ready) {
if (!mtrie_free_bkt_defer(nh->nh_router, bkt))
return;
vr_delay_op();
}
mtrie_free_entry(&cp_ent, level);
return;
}
/*
* When adding a route:
* - descend the tree to the bucket at which the route is significant.
* (i.e. the bucket corresponding to a prefix >= to the route prefix).
* - if the bucket needs to be created, it is first initialized and only
* linked to the tree when the function exits.
* - if the bucket exists, populate any descendent bucket entries that
* themselfs do not have more specific routes.
* - when a bucket is created, initialize any entries with the parent that
* covers them.
*/
static int
__mtrie_add(struct ip_mtrie *mtrie, struct vr_route_req *rt)
{
int ret, index = 0, level, err_level = 0;
unsigned char i, fin = 0;
struct ip_bucket *bkt;
struct ip_bucket_entry *ent, *err_ent = NULL;
struct vr_nexthop *nh, *err_nh = NULL;
struct mtrie_bkt_info *ip_bkt_info = ip_bkt_info_get(rt->rtr_req.rtr_family);
ent = &mtrie->root;
nh = ent->entry_nh_p;
for (level = 0; level < ip_bkt_get_max_level(rt->rtr_req.rtr_family); level++) {
if (!ENTRY_IS_BUCKET(ent)) {
bkt = mtrie_alloc_bucket(ip_bkt_info, level, ent);
set_entry_to_bucket(ent, bkt);
if (!err_ent) {
err_ent = ent;
err_nh = nh;
err_level = level;
}
}
bkt = entry_to_bucket(ent);
if (!bkt) {
ret = -ENOMEM;
goto exit_ret;
}
index = rt_to_index(rt, level);
ent = index_to_entry(bkt, index);
if (rt->rtr_req.rtr_prefix_len > ip_bkt_info[level].bi_pfx_len) {
if (ENTRY_IS_NEXTHOP(ent)) {
nh = ent->entry_nh_p;
}
continue;
} else {
/*
* cover all the indices for which this route is the best
* prefix match
*/
if ((rt->rtr_req.rtr_prefix_len >
(ip_bkt_info[level].bi_pfx_len - ip_bkt_info[level].bi_bits)) &&
(rt->rtr_req.rtr_prefix_len <= ip_bkt_info[level].bi_pfx_len)) {
fin = 1 << (ip_bkt_info[level].bi_pfx_len - rt->rtr_req.rtr_prefix_len);
}
/*
* Run through the loop 'fin' times only
* If fin is 0, it actually means 256 ('char' overflow), so run the
* loop 256 times
*/
for (i = index; i <= (ip_bkt_info[level].bi_size-1); i++) {
ent = index_to_entry(bkt, i);
if (ENTRY_IS_BUCKET(ent))
add_to_tree(ent, level, rt);
else if (ent->entry_prefix_len <= rt->rtr_req.rtr_prefix_len) {
/* a less specific entry, which needs to be replaced */
set_entry_to_nh(ent, rt->rtr_nh);
ent->entry_prefix_len = rt->rtr_req.rtr_prefix_len;
ent->entry_label_flags = rt->rtr_req.rtr_label_flags;
ent->entry_label = rt->rtr_req.rtr_label;
ent->entry_bridge_index = rt->rtr_req.rtr_index;
}
if (fin) {
/* Repeat the loop 'fin' times only */
fin--;
if (fin == 0)
break;
}
/*
* Bailout at the last index,
* the below check takes care of overflow
*/
if (i == (ip_bkt_info[level].bi_size-1))
break;
}
break;
}
}
return 0;
exit_ret:
if (err_ent)
mtrie_reset_entry(err_ent, err_level, err_nh);
return ret;
}
static int
__mtrie_delete(struct vr_route_req *rt, struct ip_bucket_entry *ent,
unsigned char level)
{
unsigned int index, i, fin;
struct ip_bucket *bkt;
struct ip_bucket_entry *tmp_ent;
struct mtrie_bkt_info *ip_bkt_info = ip_bkt_info_get(rt->rtr_req.rtr_family);
if (ENTRY_IS_NEXTHOP(ent))
return -ENOENT;
bkt = entry_to_bucket(ent);
index = rt_to_index(rt, level);
if (rt->rtr_req.rtr_prefix_len > ip_bkt_info[level].bi_pfx_len) {
tmp_ent = index_to_entry(bkt, index);
__mtrie_delete(rt, tmp_ent, level + 1);
} else {
if ((rt->rtr_req.rtr_prefix_len >
(ip_bkt_info[level].bi_pfx_len - ip_bkt_info[level].bi_bits)) &&
(rt->rtr_req.rtr_prefix_len <= ip_bkt_info[level].bi_pfx_len)) {
fin = 1 << (ip_bkt_info[level].bi_pfx_len - rt->rtr_req.rtr_prefix_len);
index &= ~(fin - 1);
} else {
fin = ip_bkt_info[level].bi_size;
index = 0;
}
fin += index;
if (fin > ip_bkt_info[level].bi_size)
fin = ip_bkt_info[level].bi_size;
for (i = index; i < fin; i++) {
tmp_ent = index_to_entry(bkt, i);
if (tmp_ent->entry_prefix_len == rt->rtr_req.rtr_prefix_len) {
tmp_ent->entry_label_flags = rt->rtr_req.rtr_label_flags;
tmp_ent->entry_label = rt->rtr_req.rtr_label;
tmp_ent->entry_prefix_len = rt->rtr_req.rtr_replace_plen;
if (ENTRY_IS_NEXTHOP(tmp_ent)) {
set_entry_to_nh(tmp_ent, rt->rtr_nh);
tmp_ent->entry_bridge_index = rt->rtr_req.rtr_index;
} else {
__mtrie_delete(rt, tmp_ent, level + 1);
}
}
}
}
/* check if current bucket neds to be deleted */
for (i = 1; i < ip_bkt_info[level].bi_size; i++) {
if ((bkt->bkt_data[i].entry_long_i == bkt->bkt_data[0].entry_long_i) &&
(bkt->bkt_data[i].entry_label_flags ==
bkt->bkt_data[0].entry_label_flags) &&
(bkt->bkt_data[i].entry_label ==
bkt->bkt_data[0].entry_label) &&
(bkt->bkt_data[i].entry_prefix_len ==
bkt->bkt_data[0].entry_prefix_len)) {
continue;
} else
return 0;
}
mtrie_delete_bkt(ent, rt);
return 0;
}
static int
mtrie_dumper_route_encode(struct vr_message_dumper *dumper, vr_route_req *resp)
{
int len;
len = vr_message_dump_object(dumper, VR_ROUTE_OBJECT_ID, resp);
if (len <= 0)
return len;
return 1;
}
static void
mtrie_dumper_make_response(struct vr_message_dumper *dumper, vr_route_req *resp,
struct ip_bucket_entry *ent, int8_t *prefix, unsigned int prefix_len)
{
vr_route_req *req = (vr_route_req *)dumper->dump_req;
struct vr_route_req lreq;
resp->rtr_vrf_id = req->rtr_vrf_id;
resp->rtr_family = req->rtr_family;
memcpy(resp->rtr_prefix, prefix, prefix_len / IPBUCKET_LEVEL_BITS);
resp->rtr_prefix_size = req->rtr_prefix_size;
resp->rtr_marker_size = 0;
resp->rtr_marker = NULL;
resp->rtr_prefix_len = prefix_len;
resp->rtr_rid = req->rtr_rid;
resp->rtr_label_flags = ent->entry_label_flags;
resp->rtr_label = ent->entry_label;
resp->rtr_nh_id = ent->entry_nh_p->nh_id;
resp->rtr_index = ent->entry_bridge_index;
if (resp->rtr_index != VR_BE_INVALID_INDEX) {
resp->rtr_mac = vr_zalloc(VR_ETHER_ALEN, VR_ROUTE_REQ_MAC_OBJECT);
resp->rtr_mac_size = VR_ETHER_ALEN;
lreq.rtr_req.rtr_mac = resp->rtr_mac;
lreq.rtr_req.rtr_index = resp->rtr_index;
lreq.rtr_req.rtr_mac_size = VR_ETHER_ALEN;
vr_bridge_lookup(resp->rtr_vrf_id, &lreq);
} else {
resp->rtr_mac_size = 0;
resp->rtr_mac = NULL;
}
resp->rtr_replace_plen = ent->entry_prefix_len;
return;
}
static int
mtrie_dump_entry(struct vr_message_dumper *dumper, struct ip_bucket_entry *ent,
int8_t *prefix, int level)
{
unsigned char i = 0;
unsigned int j;
int ret;
struct ip_bucket *bkt;
struct ip_bucket_entry *ent_p = ent;
struct mtrie_bkt_info *ip_bkt_info;
vr_route_req *req;
int done = 0;
uint32_t rt_prefix[4];
req = dumper->dump_req;
ip_bkt_info = ip_bkt_info_get(req->rtr_family);
if (!dumper->dump_been_to_marker) {
i = PREFIX_TO_INDEX(req->rtr_marker, level);
bkt = entry_to_bucket(ent);
ent = index_to_entry(bkt, i);
prefix[level] = i;
if ((!memcmp(prefix, req->rtr_marker, ip_bkt_info[level].bi_pfx_len/8)) &&
(ip_bkt_info[level].bi_pfx_len == req->rtr_marker_plen)) {
dumper->dump_been_to_marker = 1;
}
/* take care of overflow */
if (i == (ip_bkt_info[level].bi_size - 1))
done = 1;
if (ENTRY_IS_BUCKET(ent) && !dumper->dump_been_to_marker) {
if (mtrie_dump_entry(dumper, ent, prefix, level + 1))
return -1;
i++;
} else {
if (dumper->dump_been_to_marker)
i++;
dumper->dump_been_to_marker = 1;
}
}
if (ENTRY_IS_BUCKET(ent_p)) {
if (done)
return 0;
j = ip_bkt_info[level].bi_size - i;
bkt = entry_to_bucket(ent_p);
for (; j > 0; j--, i++) {
ent = &bkt->bkt_data[i];
prefix[level] = i;
if (mtrie_dump_entry(dumper, ent, prefix, level + 1) < 0)
return -1;
}
} else if (ent_p->entry_nh_p) {
memset(rt_prefix, 0, sizeof(rt_prefix));
dump_resp.rtr_prefix = (uint8_t*)&rt_prefix;
mtrie_dumper_make_response(dumper, &dump_resp, ent_p, prefix,
ip_bkt_info[level - 1].bi_pfx_len);
ret = mtrie_dumper_route_encode(dumper, &dump_resp);
if (dump_resp.rtr_mac_size) {
vr_free(dump_resp.rtr_mac, VR_ROUTE_REQ_MAC_OBJECT);
dump_resp.rtr_mac_size = 0;
dump_resp.rtr_mac = NULL;
}
dump_resp.rtr_prefix = NULL;
if (ret <= 0)
return -1;
}
return 0;
}
static int
mtrie_walk(struct vr_message_dumper *dumper, unsigned int family)
{
vr_route_req *req;
struct ip_mtrie *mtrie;
struct ip_bucket_entry *ent;
int ret = 0;
uint32_t rt_prefix[4];
req = (vr_route_req *)dumper->dump_req;
mtrie = vrfid_to_mtrie(req->rtr_vrf_id, family);
if (!mtrie)
return -EINVAL;
ent = &mtrie->root;
if (ENTRY_IS_BUCKET(ent)) {
ret = mtrie_dump_entry(dumper, ent, (uint8_t*)&rt_prefix, 0);
}
return ret;
}
static int
mtrie_dump(struct vr_rtable * __unsued, struct vr_route_req *rt)
{
int ret = 0;
struct vr_message_dumper *dumper;
dumper = vr_message_dump_init(&rt->rtr_req);
if (!dumper) {
ret = -ENOMEM;
goto generate_response;
}
if (((vr_route_req *)(dumper->dump_req))->rtr_marker_size == 0)
dumper->dump_been_to_marker = 1;
ret = mtrie_walk(dumper, rt->rtr_req.rtr_family);
generate_response:
vr_message_dump_exit(dumper, ret);
return 0;
}
/*
* Delete a route from the table.
* prefix is in network byte order.
* returns 0 on failure; or non-zero if an entry was found.
*
* When deleting a route:
* - Move all descendent bucket (not covered by more-specifics) with the
* parent of this node.
* - If any buckets contain the same next-hop result, the bucket can be
* deleted. Memory should be freed after a delay in order to deal with
* concurrency.
*/
static int
mtrie_delete(struct vr_rtable * _unused, struct vr_route_req *rt)
{
int vrf_id = rt->rtr_req.rtr_vrf_id;
struct ip_mtrie *rtable;
struct vr_route_req lreq;
rtable = vrfid_to_mtrie(vrf_id, rt->rtr_req.rtr_family);
if (!rtable)
return -ENOENT;
rt->rtr_nh = vrouter_get_nexthop(rt->rtr_req.rtr_rid, rt->rtr_req.rtr_nh_id);
if (!rt->rtr_nh)
return -ENOENT;
rt->rtr_req.rtr_index = VR_BE_INVALID_INDEX;
if ((rt->rtr_req.rtr_mac_size == VR_ETHER_ALEN) &&
(!IS_MAC_ZERO(rt->rtr_req.rtr_mac))) {
lreq.rtr_req.rtr_index = rt->rtr_req.rtr_index;
lreq.rtr_req.rtr_mac_size = VR_ETHER_ALEN;
lreq.rtr_req.rtr_mac = rt->rtr_req.rtr_mac;
lreq.rtr_req.rtr_vrf_id = vrf_id;
if (!vr_bridge_lookup(vrf_id, &lreq))
return -ENOENT;
rt->rtr_req.rtr_index = lreq.rtr_req.rtr_index;
}
__mtrie_delete(rt, &rtable->root, 0);
vrouter_put_nexthop(rt->rtr_nh);
return 0;
}
static inline struct vr_vrf_stats *
mtrie_stats(int vrf, unsigned int cpu)
{
if ((unsigned int)vrf >= vr_vrfs)
return &invalid_vrf_stats[cpu];
if (mtrie_vrf_stats)
return &((mtrie_vrf_stats[vrf])[cpu]);
return NULL;
}
static int
mtrie_stats_get(vr_vrf_stats_req *req, vr_vrf_stats_req *response)
{
unsigned int i;
struct vr_vrf_stats *stats;
memset(response, 0, sizeof(*response));
response->vsr_rid = req->vsr_rid;
response->vsr_family = req->vsr_family;
response->vsr_type = req->vsr_type;
response->vsr_vrf = req->vsr_vrf;
for (i = 0; i < vr_num_cpus; i++) {
stats = mtrie_stats(req->vsr_vrf, i);
if (stats) {
response->vsr_discards += stats->vrf_discards;
response->vsr_resolves += stats->vrf_resolves;
response->vsr_receives += stats->vrf_receives;
response->vsr_l2_receives += stats->vrf_l2_receives;
response->vsr_ecmp_composites += stats->vrf_ecmp_composites;
response->vsr_encap_composites += stats->vrf_encap_composites;
response->vsr_evpn_composites += stats->vrf_evpn_composites;
response->vsr_l2_mcast_composites += stats->vrf_l2_mcast_composites;
response->vsr_fabric_composites += stats->vrf_fabric_composites;
response->vsr_udp_tunnels += stats->vrf_udp_tunnels;
response->vsr_udp_mpls_tunnels += stats->vrf_udp_mpls_tunnels;
response->vsr_gre_mpls_tunnels += stats->vrf_gre_mpls_tunnels;
response->vsr_l2_encaps += stats->vrf_l2_encaps;
response->vsr_encaps += stats->vrf_encaps;
response->vsr_gros += stats->vrf_gros;
response->vsr_diags += stats->vrf_diags;
response->vsr_vxlan_tunnels += stats->vrf_vxlan_tunnels;
response->vsr_arp_virtual_proxy += stats->vrf_arp_virtual_proxy;
response->vsr_arp_virtual_stitch += stats->vrf_arp_virtual_stitch;
response->vsr_arp_virtual_flood += stats->vrf_arp_virtual_flood;
response->vsr_arp_physical_stitch += stats->vrf_arp_physical_stitch;
response->vsr_arp_tor_proxy += stats->vrf_arp_tor_proxy;
response->vsr_arp_physical_flood += stats->vrf_arp_physical_flood;
response->vsr_vrf_translates += stats->vrf_vrf_translates;
response->vsr_uuc_floods += stats->vrf_uuc_floods;
}
}
return 0;
}
static bool
mtrie_stats_empty(vr_vrf_stats_req *r)
{
if (r->vsr_discards || r->vsr_resolves || r->vsr_receives ||
r->vsr_ecmp_composites || r->vsr_l2_mcast_composites ||
r->vsr_fabric_composites || r->vsr_udp_tunnels ||
r->vsr_udp_mpls_tunnels || r->vsr_gre_mpls_tunnels ||
r->vsr_l2_encaps || r->vsr_encaps || r->vsr_gros ||
r->vsr_diags || r->vsr_encap_composites ||
r->vsr_evpn_composites || r->vsr_vrf_translates ||
r->vsr_vxlan_tunnels || r->vsr_arp_virtual_proxy ||
r->vsr_arp_virtual_stitch || r->vsr_arp_virtual_flood ||
r->vsr_arp_physical_stitch || r->vsr_arp_tor_proxy ||
r->vsr_arp_physical_flood || r->vsr_l2_receives ||
r->vsr_uuc_floods)
return false;
return true;
}
static int
mtrie_stats_dump(struct vr_rtable *rtable, vr_vrf_stats_req *req)
{
int ret = 0, len;
unsigned int i;
struct vr_message_dumper *dumper;
vr_vrf_stats_req response;
dumper = vr_message_dump_init(req);
if (!dumper) {
ret = -ENOMEM;
goto generate_response;
}
for (i = req->vsr_marker + 1; i < rtable->algo_max_vrfs; i++) {
req->vsr_vrf = i;
mtrie_stats_get(req, &response);
if (mtrie_stats_empty(&response))
continue;
len = vr_message_dump_object(dumper, VR_VRF_STATS_OBJECT_ID,
&response);
if (len <= 0)
goto generate_response;
}
req->vsr_vrf = -1;
mtrie_stats_get(req, &response);
if (mtrie_stats_empty(&response))
goto generate_response;
len = vr_message_dump_object(dumper, VR_VRF_STATS_OBJECT_ID,
&response);
generate_response:
vr_message_dump_exit(dumper, ret);
return 0;
}
static struct vr_nexthop *
__mtrie_lookup(struct vr_route_req *rt, struct ip_bucket *bkt, unsigned int level)
{
unsigned int i, limit, index;
unsigned long ptr;
struct ip_bucket_entry *ent;
struct mtrie_bkt_info *ip_bkt_info;
struct vr_nexthop *ret_nh = NULL;
if (!bkt || level >= ip_bkt_get_max_level(rt->rtr_req.rtr_family))
return NULL;
ip_bkt_info = ip_bkt_info_get(rt->rtr_req.rtr_family);
index = rt_to_index(rt, level);
if (rt->rtr_req.rtr_prefix_len > ip_bkt_info[level].bi_pfx_len) {
limit = ip_bkt_info[level].bi_size;
} else {
limit = (1 <<
(ip_bkt_info[level].bi_pfx_len - rt->rtr_req.rtr_prefix_len));
}
/*
* ideally, we would have just followed the calculated index to the
* bottom of the tree and returned. however, what happens when the
* bottom of the tree is populated with a more specific route? for
* e.g.: we are searching for 1.1.0.0/16, but we also have a more
* specific route for 1.1.0.0/24. So, to get around that case, we
* need to loop the whole bucket, searching for a prefix length match.
*
* So what happens if all of the prefixes below have a more specific
* route. For e.g.: 1.1.0, 1.1.1, 1.1.2, ... 1.1.255. While there are
* no practical applications of such a route, for correctness, in such
* a case, we loop around the current bucket: i.e. in this case, we will
* loop around the bucket that holds 1.1/16. Maybe 1.2/16 was inherited
* from a lesser specific prefix and hence a match.
*/
for (i = 0; i < ip_bkt_info[level].bi_size; i++) {
ent = index_to_entry(bkt, (index + i) % ip_bkt_info[level].bi_size);
ptr = ent->entry_long_i;
if (PTR_IS_NEXTHOP(ptr)) {
if (i >= limit) {
if (ent->entry_prefix_len >= rt->rtr_req.rtr_prefix_len)
continue;
}
if (ent->entry_prefix_len > rt->rtr_req.rtr_prefix_len)
continue;
rt->rtr_req.rtr_label_flags = ent->entry_label_flags;
rt->rtr_req.rtr_label = ent->entry_label;
rt->rtr_req.rtr_prefix_len = ent->entry_prefix_len;
rt->rtr_req.rtr_index = ent->entry_bridge_index;
ret_nh = PTR_TO_NEXTHOP(ptr);
rt->rtr_nh = ret_nh;
break;
} else {
bkt = PTR_TO_BUCKET(ptr);
ret_nh = __mtrie_lookup(rt, bkt, level + 1);
if (ret_nh)
break;
}
}
return ret_nh;
}
/*
* longest prefix match. go down the tree till you encounter a next-hop.
* if no nexthop, there is something wrong with the tree which was built.
*
* returns the nexthop of the LPM route
*/
static struct vr_nexthop *
mtrie_lookup(unsigned int vrf_id, struct vr_route_req *rt)
{
unsigned int level = 0;
unsigned long ptr;
struct ip_mtrie *table;
struct ip_bucket *bkt;
struct ip_bucket_entry *ent;
struct vr_nexthop *default_nh, *ret_nh;
default_nh = ip4_default_nh;
table = vrfid_to_mtrie(vrf_id, rt->rtr_req.rtr_family);
if (!table) {
rt->rtr_nh = default_nh;
return default_nh;
}
ent = &table->root;
ptr = ent->entry_long_i;
if (!ptr) {
rt->rtr_nh = default_nh;
return default_nh;
}
if (PTR_IS_NEXTHOP(ptr)) {
rt->rtr_req.rtr_label_flags = ent->entry_label_flags;
rt->rtr_req.rtr_label = ent->entry_label;
rt->rtr_req.rtr_prefix_len = ent->entry_prefix_len;
rt->rtr_req.rtr_index = ent->entry_bridge_index;
ret_nh = PTR_TO_NEXTHOP(ptr);
rt->rtr_nh = ret_nh;
return ret_nh;
}
bkt = PTR_TO_BUCKET(ptr);
if (!bkt) {
rt->rtr_nh = default_nh;
return default_nh;
}
ret_nh = __mtrie_lookup(rt, bkt, level);
if (!ret_nh)
ret_nh = default_nh;