From 11fe9262ed226c127f67ca4bd85977b22589b68a Mon Sep 17 00:00:00 2001 From: Björn Töpel Date: Thu, 21 Feb 2019 13:07:38 +0100 Subject: Revert "xsk: simplify AF_XDP socket teardown" MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This reverts commit e2ce3674883ecba2605370404208c9d4a07ae1c3. 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 Signed-off-by: Daniel Borkmann --- net/xdp/xsk.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'net/xdp') diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 45f3b528dc09..85e4fe4f18cc 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -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); -- cgit v1.2.3-59-g8ed1b