From 455302d1c9ae9318660aaeb9748a01ff414c9741 Mon Sep 17 00:00:00 2001 From: Ilya Maximets Date: Fri, 28 Jun 2019 11:04:07 +0300 Subject: xdp: fix hang while unregistering device bound to xdp socket Device that bound to XDP socket will not have zero refcount until the userspace application will not close it. This leads to hang inside 'netdev_wait_allrefs()' if device unregistering requested: # ip link del p1 < hang on recvmsg on netlink socket > # ps -x | grep ip 5126 pts/0 D+ 0:00 ip link del p1 # journalctl -b Jun 05 07:19:16 kernel: unregister_netdevice: waiting for p1 to become free. Usage count = 1 Jun 05 07:19:27 kernel: unregister_netdevice: waiting for p1 to become free. Usage count = 1 ... Fix that by implementing NETDEV_UNREGISTER event notification handler to properly clean up all the resources and unref device. This should also allow socket killing via ss(8) utility. Fixes: 965a99098443 ("xsk: add support for bind for Rx") Signed-off-by: Ilya Maximets Acked-by: Jonathan Lemon Signed-off-by: Daniel Borkmann --- net/xdp/xdp_umem.h | 1 + 1 file changed, 1 insertion(+) (limited to 'net/xdp/xdp_umem.h') diff --git a/net/xdp/xdp_umem.h b/net/xdp/xdp_umem.h index 27603227601b..a63a9fb251f5 100644 --- a/net/xdp/xdp_umem.h +++ b/net/xdp/xdp_umem.h @@ -10,6 +10,7 @@ int xdp_umem_assign_dev(struct xdp_umem *umem, struct net_device *dev, u16 queue_id, u16 flags); +void xdp_umem_clear_dev(struct xdp_umem *umem); bool xdp_umem_validate_queues(struct xdp_umem *umem); void xdp_get_umem(struct xdp_umem *umem); void xdp_put_umem(struct xdp_umem *umem); -- cgit