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flow: Make unified version of flow table compaction

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tcp_table_compact() will move entries in the connection/flow table to keep
it compact when other entries are removed.  The moved entries need not have
the same type as the flow removed, so it needs to be able to handle moving
any type of flow.  Therefore, move it to flow.c rather than being
purportedly TCP specific.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2023-11-30 13:02:12 +11:00 • committed by Stefano Brivio
parent 9d44aba7e0
commit 96590b0560
5 changed files with 48 additions and 44 deletions

46
tcp.c
View file

@ -1244,8 +1244,9 @@ static void tcp_hash_remove(const struct ctx *c,
* @old: Old location of tcp_tap_conn
* @new: New location of tcp_tap_conn
*/
static void tcp_tap_conn_update(const struct ctx *c, struct tcp_tap_conn *old,
struct tcp_tap_conn *new)
void tcp_tap_conn_update(const struct ctx *c, struct tcp_tap_conn *old,
struct tcp_tap_conn *new)
{
struct tcp_tap_conn *entry, *prev = NULL;
int b = tcp_conn_hash(c, old);
@ -1297,45 +1298,6 @@ static struct tcp_tap_conn *tcp_hash_lookup(const struct ctx *c,
return NULL;
}
/**
* tcp_table_compact() - Perform compaction on connection table
* @c: Execution context
* @hole: Pointer to recently closed connection
*/
void tcp_table_compact(struct ctx *c, union flow *hole)
{
union flow *from;
if (FLOW_IDX(hole) == --c->flow_count) {
debug("TCP: table compaction: maximum index was %u (%p)",
FLOW_IDX(hole), (void *)hole);
memset(hole, 0, sizeof(*hole));
return;
}
from = flowtab + c->flow_count;
memcpy(hole, from, sizeof(*hole));
switch (from->f.type) {
case FLOW_TCP:
tcp_tap_conn_update(c, &from->tcp, &hole->tcp);
break;
case FLOW_TCP_SPLICE:
tcp_splice_conn_update(c, &hole->tcp_splice);
break;
default:
die("Unexpected %s in tcp_table_compact()",
FLOW_TYPE(&from->f));
}
debug("TCP: table compaction (%s): old index %u, new index %u, "
"from: %p, to: %p",
FLOW_TYPE(&from->f), FLOW_IDX(from), FLOW_IDX(hole),
(void *)from, (void *)hole);
memset(from, 0, sizeof(*from));
}
/**
* tcp_conn_destroy() - Close sockets, trigger hash table removal and compaction
* @c: Execution context
@ -1350,7 +1312,7 @@ static void tcp_conn_destroy(struct ctx *c, union flow *flow)
close(conn->timer);
tcp_hash_remove(c, conn);
tcp_table_compact(c, flow);
flow_table_compact(c, flow);
}
static void tcp_rst_do(struct ctx *c, struct tcp_tap_conn *conn);