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Message-Id: <1460198783-10026-1-git-send-email-hannes@stressinduktion.org> Date: Sat, 9 Apr 2016 12:46:23 +0200 From: Hannes Frederic Sowa <hannes@...essinduktion.org> To: netdev@...r.kernel.org Subject: [PATCH net-next] vxlan: reduce usage of synchronize_net in ndo_stop We only need to do the synchronize_net dance once for both, ipv4 and ipv6 sockets, thus removing one synchronize_net in case both sockets get dismantled. Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org> --- Based on patch: [net-next,v2] vxlan: synchronously and race-free destruction of vxlan sockets drivers/net/vxlan.c | 28 ++++++++++++++++++++-------- 1 file changed, 20 insertions(+), 8 deletions(-) diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index 77ba31a0e44f97..c417bbfa3ab49f 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -1037,14 +1037,14 @@ static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev) return false; } -static void __vxlan_sock_release(struct vxlan_sock *vs) +static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) { struct vxlan_net *vn; if (!vs) - return; + return false; if (!atomic_dec_and_test(&vs->refcnt)) - return; + return false; vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); spin_lock(&vn->sock_lock); @@ -1052,16 +1052,28 @@ static void __vxlan_sock_release(struct vxlan_sock *vs) vxlan_notify_del_rx_port(vs); spin_unlock(&vn->sock_lock); - synchronize_net(); - udp_tunnel_sock_release(vs->sock); - kfree(vs); + return true; } static void vxlan_sock_release(struct vxlan_dev *vxlan) { - __vxlan_sock_release(vxlan->vn4_sock); + bool ipv4 = __vxlan_sock_release_prep(vxlan->vn4_sock); #if IS_ENABLED(CONFIG_IPV6) - __vxlan_sock_release(vxlan->vn6_sock); + bool ipv6 = __vxlan_sock_release_prep(vxlan->vn6_sock); +#endif + + synchronize_net(); + + if (ipv4) { + udp_tunnel_sock_release(vxlan->vn4_sock->sock); + kfree(vxlan->vn4_sock); + } + +#if IS_ENABLED(CONFIG_IPV6) + if (ipv6) { + udp_tunnel_sock_release(vxlan->vn6_sock->sock); + kfree(vxlan->vn6_sock); + } #endif } -- 2.5.5
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