From e2ce3674883ecba2605370404208c9d4a07ae1c3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= Date: Wed, 19 Dec 2018 13:09:31 +0100 Subject: [PATCH] xsk: simplify AF_XDP socket teardown MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Prior this commit, when the struct socket object was being released, the UMEM did not have its reference count decreased. Instead, this was done in the struct sock sk_destruct function. There is no reason to keep the UMEM reference around when the socket is being orphaned, so in this patch the xdp_put_mem is called in the xsk_release function. This results in that the xsk_destruct function can be removed! Note that, it still holds that a struct xsk_sock reference might still linger in the XSKMAP after the UMEM is released, e.g. if a user does not clear the XSKMAP prior to closing the process. This sock will be in a "released" zombie like state, until the XSKMAP is removed. Signed-off-by: Björn Töpel Signed-off-by: Daniel Borkmann --- net/xdp/xsk.c | 16 +--------------- 1 file changed, 1 insertion(+), 15 deletions(-) diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 07156f43d295..a03268454a27 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -366,6 +366,7 @@ 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; @@ -713,18 +714,6 @@ 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) { @@ -751,9 +740,6 @@ 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);