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tcp: Improved helpers to update connections after moving

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When we compact the connection tables (both spliced and non-spliced) we
need to move entries from one slot to another.  That requires some updates
in the entries themselves.  Add helpers to make all the necessary updates
for the spliced and non-spliced cases.  This will simplify later cleanups.

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 2022-11-17 16:58:45 +11:00 • committed by Stefano Brivio
parent ff27fd63cd
commit 181ce83d9b
2 changed files with 23 additions and 10 deletions

16
tcp.c
View file

@ -1291,11 +1291,13 @@ static void tcp_hash_remove(const struct tcp_tap_conn *conn)
}
/**
* tcp_hash_update() - Update pointer for given connection
* @old: Old connection pointer
* @new: New connection pointer
* tcp_tap_conn_update() - Update tcp_tap_conn when being moved in the table
* @c: Execution context
* @old: Old location of tcp_tap_conn
* @new: New location of tcp_tap_conn
*/
static void tcp_hash_update(struct tcp_tap_conn *old, struct tcp_tap_conn *new)
static void tcp_tap_conn_update(struct ctx *c, struct tcp_tap_conn *old,
struct tcp_tap_conn *new)
{
struct tcp_tap_conn *entry, *prev = NULL;
int b = old->hash_bucket;
@ -1314,6 +1316,8 @@ static void tcp_hash_update(struct tcp_tap_conn *old, struct tcp_tap_conn *new)
debug("TCP: hash table update: old index %li, new index %li, sock %i, "
"bucket: %i, old: %p, new: %p",
CONN_IDX(old), CONN_IDX(new), new->sock, b, old, new);
tcp_epoll_ctl(c, new);
}
/**
@ -1362,9 +1366,7 @@ static void tcp_table_compact(struct ctx *c, struct tcp_tap_conn *hole)
memcpy(hole, from, sizeof(*hole));
to = hole;
tcp_hash_update(from, to);
tcp_epoll_ctl(c, to);
tcp_tap_conn_update(c, from, to);
debug("TCP: hash table compaction: old index %li, new index %li, "
"sock %i, from: %p, to: %p",