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BGP: pending TX prefixes link netindex instead of copying net_addr

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This helps with memory consumption, allows for removal of multiple
slab/mblock ifs and prepares for easier feeds.
This commit is contained in:
Maria Matejka 2024-05-28 21:49:07 +02:00 committed by Katerina Kubecova
parent 1eed19cadb
commit ea9f64e0ec
3 changed files with 25 additions and 30 deletions
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41
proto/bgp/attrs.c
View File

@ -1680,7 +1680,7 @@ bgp_withdraw_bucket(struct bgp_channel *c, struct bgp_bucket *b)
{
struct bgp_prefix *px = HEAD(b->prefixes);
log(L_ERR "%s: - withdrawing %N", p->p.name, &px->net);
log(L_ERR "%s: - withdrawing %N", p->p.name, px->ni->addr);
rem_node(&px->buck_node);
add_tail(&wb->prefixes, &px->buck_node);
}
@ -1691,9 +1691,9 @@ bgp_withdraw_bucket(struct bgp_channel *c, struct bgp_bucket *b)
* Prefix hash table
*/
#define PXH_KEY(px) px->net, px->path_id, px->hash
#define PXH_KEY(px) px->ni->index, px->path_id, px->hash
#define PXH_NEXT(px) px->next
#define PXH_EQ(n1,i1,h1,n2,i2,h2) h1 == h2 && (add_path_tx ? (i1 == i2) : 1) && net_equal(n1, n2)
#define PXH_EQ(n1,i1,h1,n2,i2,h2) h1 == h2 && (add_path_tx ? (i1 == i2) : 1) && (n1 == n2)
#define PXH_FN(n,i,h) h
#define PXH_REHASH bgp_pxh_rehash
@ -1706,19 +1706,17 @@ static void
bgp_init_prefix_table(struct bgp_channel *c)
{
HASH_INIT(c->prefix_hash, c->pool, 8);
uint alen = net_addr_length[c->c.net_type];
c->prefix_slab = alen ? sl_new(c->pool, sizeof(struct bgp_prefix) + alen) : NULL;
c->prefix_slab = sl_new(c->pool, sizeof(struct bgp_prefix));
}
static struct bgp_prefix *
bgp_get_prefix(struct bgp_channel *c, const net_addr *net, struct rte_src *src, int add_path_tx)
bgp_get_prefix(struct bgp_channel *c, struct netindex *ni, struct rte_src *src, int add_path_tx)
{
u32 path_id = src->global_id;
u32 path_id_hash = add_path_tx ? path_id : 0;
/* We must use a different hash function than the rtable */
u32 hash = u32_hash(net_hash(net) ^ u32_hash(path_id_hash));
struct bgp_prefix *px = HASH_FIND(c->prefix_hash, PXH, net, path_id_hash, hash);
u32 hash = u32_hash(u32_hash(ni->index) ^ u32_hash(path_id_hash));
struct bgp_prefix *px = HASH_FIND(c->prefix_hash, PXH, ni->index, path_id_hash, hash);
if (px)
{
@ -1732,15 +1730,14 @@ bgp_get_prefix(struct bgp_channel *c, const net_addr *net, struct rte_src *src,
return px;
}
if (c->prefix_slab)
px = sl_alloc(c->prefix_slab);
else
px = mb_alloc(c->pool, sizeof(struct bgp_prefix) + net->length);
px = sl_alloc(c->prefix_slab);
*px = (struct bgp_prefix) {
.hash = hash,
.path_id = path_id,
.ni = ni,
};
*px = (struct bgp_prefix) { };
px->hash = hash;
px->path_id = path_id;
net_copy(px->net, net);
net_lock_index(c->c.table->netindex, ni);
rt_lock_source(src);
HASH_INSERT2(c->prefix_hash, PXH, c->pool, px);
@ -1757,7 +1754,7 @@ bgp_update_prefix(struct bgp_channel *c, struct bgp_prefix *px, struct bgp_bucke
#define BPX_TRACE(what) do { \
if (c->c.debug & D_ROUTES) log(L_TRACE "%s.%s < %s %N %uG %s", \
c->c.proto->name, c->c.name, what, \
px->net, px->path_id, IS_WITHDRAW_BUCKET(b) ? "withdraw" : "update"); } while (0)
px->ni->addr, px->path_id, IS_WITHDRAW_BUCKET(b) ? "withdraw" : "update"); } while (0)
px->lastmod = current_time();
/* Already queued for the same bucket */
@ -1809,12 +1806,10 @@ bgp_free_prefix(struct bgp_channel *c, struct bgp_prefix *px)
{
HASH_REMOVE2(c->prefix_hash, PXH, c->pool, px);
net_unlock_index(c->c.table->netindex, px->ni);
rt_unlock_source(rt_find_source_global(px->path_id));
if (c->prefix_slab)
sl_free(px);
else
mb_free(px);
sl_free(px);
}
void
@ -2299,7 +2294,7 @@ bgp_rt_notify(struct proto *P, struct channel *C, const net_addr *n, rte *new, c
path = old->src;
}
if (bgp_update_prefix(c, bgp_get_prefix(c, n, path, c->add_path_tx), buck))
if (bgp_update_prefix(c, bgp_get_prefix(c, NET_TO_INDEX(n), path, c->add_path_tx), buck))
bgp_schedule_packet(p->conn, c, PKT_UPDATE);
}

2
proto/bgp/bgp.h
View File

@ -435,7 +435,7 @@ struct bgp_prefix {
btime lastmod; /* Last modification of this prefix */
u32 hash;
u32 path_id;
net_addr net[0];
struct netindex *ni;
};
struct bgp_bucket {

12
proto/bgp/packets.c
View File

@ -1600,7 +1600,7 @@ bgp_encode_nlri_ip4(struct bgp_write_state *s, struct bgp_bucket *buck, byte *bu
while (!EMPTY_LIST(buck->prefixes) && (size >= BGP_NLRI_MAX))
{
struct bgp_prefix *px = HEAD(buck->prefixes);
struct net_addr_ip4 *net = (void *) px->net;
struct net_addr_ip4 *net = NET_PTR_IP4(&px->ni->addr[0]);
/* Encode path ID */
if (s->add_path)
@ -1686,7 +1686,7 @@ bgp_encode_nlri_ip6(struct bgp_write_state *s, struct bgp_bucket *buck, byte *bu
while (!EMPTY_LIST(buck->prefixes) && (size >= BGP_NLRI_MAX))
{
struct bgp_prefix *px = HEAD(buck->prefixes);
struct net_addr_ip6 *net = (void *) px->net;
struct net_addr_ip6 *net = NET_PTR_IP6(&px->ni->addr[0]);
/* Encode path ID */
if (s->add_path)
@ -1771,7 +1771,7 @@ bgp_encode_nlri_vpn4(struct bgp_write_state *s, struct bgp_bucket *buck, byte *b
while (!EMPTY_LIST(buck->prefixes) && (size >= BGP_NLRI_MAX))
{
struct bgp_prefix *px = HEAD(buck->prefixes);
struct net_addr_vpn4 *net = (void *) px->net;
struct net_addr_vpn4 *net = NET_PTR_VPN4(&px->ni->addr[0]);
/* Encode path ID */
if (s->add_path)
@ -1869,7 +1869,7 @@ bgp_encode_nlri_vpn6(struct bgp_write_state *s, struct bgp_bucket *buck, byte *b
while (!EMPTY_LIST(buck->prefixes) && (size >= BGP_NLRI_MAX))
{
struct bgp_prefix *px = HEAD(buck->prefixes);
struct net_addr_vpn6 *net = (void *) px->net;
struct net_addr_vpn6 *net = NET_PTR_VPN6(&px->ni->addr[0]);
/* Encode path ID */
if (s->add_path)
@ -1967,7 +1967,7 @@ bgp_encode_nlri_flow4(struct bgp_write_state *s, struct bgp_bucket *buck, byte *
while (!EMPTY_LIST(buck->prefixes) && (size >= 4))
{
struct bgp_prefix *px = HEAD(buck->prefixes);
struct net_addr_flow4 *net = (void *) px->net;
struct net_addr_flow4 *net = NET_PTR_FLOW4(&px->ni->addr[0]);
uint flen = net->length - sizeof(net_addr_flow4);
/* Encode path ID */
@ -2055,7 +2055,7 @@ bgp_encode_nlri_flow6(struct bgp_write_state *s, struct bgp_bucket *buck, byte *
while (!EMPTY_LIST(buck->prefixes) && (size >= 4))
{
struct bgp_prefix *px = HEAD(buck->prefixes);
struct net_addr_flow6 *net = (void *) px->net;
struct net_addr_flow6 *net = NET_PTR_FLOW6(&px->ni->addr[0]);
uint flen = net->length - sizeof(net_addr_flow6);
/* Encode path ID */