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BGP: Simpler hashing in export table

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We need a hashing simple enough to allow for feeding by netindex.
This commit is contained in:
Maria Matejka 2024-05-29 20:16:08 +02:00
parent d01a7c2bda
commit abcdde1b38
3 changed files with 17 additions and 23 deletions
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25
proto/bgp/attrs.c
View File

@ -1690,10 +1690,10 @@ bgp_withdraw_bucket(struct bgp_channel *c, struct bgp_bucket *b)
* Prefix hash table
*/
#define PXH_KEY(px) px->ni->index, px->path_id, px->hash
#define PXH_KEY(px) px->ni->index, px->src
#define PXH_NEXT(px) px->next
#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_EQ(n1,i1,n2,i2) (add_path_tx ? (i1 == i2) : 1) && (n1 == n2)
#define PXH_FN(n,i) u32_hash(n)
#define PXH_REHASH bgp_pxh_rehash
#define PXH_PARAMS /16, *1, 2, 2, 12, 24
@ -1711,19 +1711,15 @@ bgp_init_prefix_table(struct bgp_channel *c)
static struct bgp_prefix *
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(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);
struct bgp_prefix *px = HASH_FIND(c->prefix_hash, PXH, ni->index, src);
if (px)
{
if (!add_path_tx && (path_id != px->path_id))
if (!add_path_tx && (src != px->src))
{
rt_unlock_source(rt_find_source_global(px->path_id));
rt_unlock_source(px->src);
rt_lock_source(src);
px->path_id = path_id;
px->src = src;
}
return px;
@ -1731,8 +1727,7 @@ bgp_get_prefix(struct bgp_channel *c, struct netindex *ni, struct rte_src *src,
px = sl_alloc(c->prefix_slab);
*px = (struct bgp_prefix) {
.hash = hash,
.path_id = path_id,
.src = src,
.ni = ni,
};
@ -1753,7 +1748,7 @@ 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->ni->addr, px->path_id, IS_WITHDRAW_BUCKET(b) ? "withdraw" : "update"); } while (0)
px->ni->addr, px->src->global_id, IS_WITHDRAW_BUCKET(b) ? "withdraw" : "update"); } while (0)
px->lastmod = current_time();
/* Already queued for the same bucket */
@ -1806,7 +1801,7 @@ 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));
rt_unlock_source(px->src);
sl_free(px);
}

3
proto/bgp/bgp.h
View File

@ -434,8 +434,7 @@ struct bgp_prefix {
struct bgp_bucket *last; /* Last bucket sent with this prefix */
struct bgp_bucket *cur; /* Current bucket (cur == last) if no update is required */
btime lastmod; /* Last modification of this prefix */
u32 hash;
u32 path_id;
struct rte_src *src; /* Path ID encoded as rte_src */
struct netindex *ni;
};

12
proto/bgp/packets.c
View File

@ -1605,7 +1605,7 @@ bgp_encode_nlri_ip4(struct bgp_write_state *s, struct bgp_bucket *buck, byte *bu
/* Encode path ID */
if (s->add_path)
{
put_u32(pos, px->path_id);
put_u32(pos, px->src->global_id);
ADVANCE(pos, size, 4);
}
@ -1691,7 +1691,7 @@ bgp_encode_nlri_ip6(struct bgp_write_state *s, struct bgp_bucket *buck, byte *bu
/* Encode path ID */
if (s->add_path)
{
put_u32(pos, px->path_id);
put_u32(pos, px->src->global_id);
ADVANCE(pos, size, 4);
}
@ -1776,7 +1776,7 @@ bgp_encode_nlri_vpn4(struct bgp_write_state *s, struct bgp_bucket *buck, byte *b
/* Encode path ID */
if (s->add_path)
{
put_u32(pos, px->path_id);
put_u32(pos, px->src->global_id);
ADVANCE(pos, size, 4);
}
@ -1874,7 +1874,7 @@ bgp_encode_nlri_vpn6(struct bgp_write_state *s, struct bgp_bucket *buck, byte *b
/* Encode path ID */
if (s->add_path)
{
put_u32(pos, px->path_id);
put_u32(pos, px->src->global_id);
ADVANCE(pos, size, 4);
}
@ -1973,7 +1973,7 @@ bgp_encode_nlri_flow4(struct bgp_write_state *s, struct bgp_bucket *buck, byte *
/* Encode path ID */
if (s->add_path)
{
put_u32(pos, px->path_id);
put_u32(pos, px->src->global_id);
ADVANCE(pos, size, 4);
}
@ -2061,7 +2061,7 @@ bgp_encode_nlri_flow6(struct bgp_write_state *s, struct bgp_bucket *buck, byte *
/* Encode path ID */
if (s->add_path)
{
put_u32(pos, px->path_id);
put_u32(pos, px->src->global_id);
ADVANCE(pos, size, 4);
}