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Revert "xsk: simplify AF_XDP socket teardown"

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This reverts commit e2ce367488.

It turns out that the sock destructor xsk_destruct was needed after
all. The cleanup simplification broke the skb transmit cleanup path,
due to that the umem was prematurely destroyed.

The umem cannot be destroyed until all outstanding skbs are freed,
which means that we cannot remove the umem until the sk_destruct has
been called.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Björn Töpel 2019-02-21 13:07:38 +01:00 committed by Daniel Borkmann
parent df1a2cb7c7
commit 11fe9262ed
1 changed files with 15 additions and 1 deletions
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16
net/xdp/xsk.c
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@ -366,7 +366,6 @@ static int xsk_release(struct socket *sock)
xskq_destroy(xs->rx);
xskq_destroy(xs->tx);
xdp_put_umem(xs->umem);
sock_orphan(sk);
sock->sk = NULL;
@ -718,6 +717,18 @@ static const struct proto_ops xsk_proto_ops = {
.sendpage = sock_no_sendpage,
};
static void xsk_destruct(struct sock *sk)
{
struct xdp_sock *xs = xdp_sk(sk);
if (!sock_flag(sk, SOCK_DEAD))
return;
xdp_put_umem(xs->umem);
sk_refcnt_debug_dec(sk);
}
static int xsk_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
@ -744,6 +755,9 @@ static int xsk_create(struct net *net, struct socket *sock, int protocol,
sk->sk_family = PF_XDP;
sk->sk_destruct = xsk_destruct;
sk_refcnt_debug_inc(sk);
sock_set_flag(sk, SOCK_RCU_FREE);
xs = xdp_sk(sk);