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![Paolo Abeni](/assets/img/avatar_default.png)
Each openvswitch tunnel vport (vxlan,gre,geneve) holds a reference to the underlying tunnel device, but never released it when such device is deleted. Deleting the underlying device via the ip tool cause the kernel to hangup in the netdev_wait_allrefs() loop. This commit ensure that on device unregistration dp_detach_port_notify() is called for all vports that hold the device reference, properly releasing it. Fixes:614732eaa1
("openvswitch: Use regular VXLAN net_device device") Fixes:b2acd1dc39
("openvswitch: Use regular GRE net_device instead of vport") Fixes:6b001e682e
("openvswitch: Use Geneve device.") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Flavio Leitner <fbl@sysclose.org> Acked-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
222 lines
5.3 KiB
C
222 lines
5.3 KiB
C
/*
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* Copyright (c) 2007-2012 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/if_arp.h>
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#include <linux/if_bridge.h>
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#include <linux/if_vlan.h>
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#include <linux/kernel.h>
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#include <linux/llc.h>
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#include <linux/rtnetlink.h>
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#include <linux/skbuff.h>
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#include <linux/openvswitch.h>
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#include <linux/export.h>
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#include <net/ip_tunnels.h>
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#include <net/rtnetlink.h>
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#include "datapath.h"
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#include "vport.h"
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#include "vport-internal_dev.h"
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#include "vport-netdev.h"
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static struct vport_ops ovs_netdev_vport_ops;
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/* Must be called with rcu_read_lock. */
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static void netdev_port_receive(struct sk_buff *skb)
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{
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struct vport *vport;
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vport = ovs_netdev_get_vport(skb->dev);
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if (unlikely(!vport))
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goto error;
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if (unlikely(skb_warn_if_lro(skb)))
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goto error;
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/* Make our own copy of the packet. Otherwise we will mangle the
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* packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
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*/
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skb = skb_share_check(skb, GFP_ATOMIC);
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if (unlikely(!skb))
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return;
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skb_push(skb, ETH_HLEN);
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ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
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ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
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return;
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error:
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kfree_skb(skb);
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}
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/* Called with rcu_read_lock and bottom-halves disabled. */
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static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
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{
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struct sk_buff *skb = *pskb;
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if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
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return RX_HANDLER_PASS;
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netdev_port_receive(skb);
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return RX_HANDLER_CONSUMED;
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}
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static struct net_device *get_dpdev(const struct datapath *dp)
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{
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struct vport *local;
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local = ovs_vport_ovsl(dp, OVSP_LOCAL);
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BUG_ON(!local);
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return local->dev;
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}
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struct vport *ovs_netdev_link(struct vport *vport, const char *name)
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{
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int err;
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vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
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if (!vport->dev) {
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err = -ENODEV;
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goto error_free_vport;
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}
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if (vport->dev->flags & IFF_LOOPBACK ||
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vport->dev->type != ARPHRD_ETHER ||
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ovs_is_internal_dev(vport->dev)) {
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err = -EINVAL;
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goto error_put;
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}
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rtnl_lock();
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err = netdev_master_upper_dev_link(vport->dev,
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get_dpdev(vport->dp));
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if (err)
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goto error_unlock;
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err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
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vport);
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if (err)
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goto error_master_upper_dev_unlink;
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dev_disable_lro(vport->dev);
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dev_set_promiscuity(vport->dev, 1);
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vport->dev->priv_flags |= IFF_OVS_DATAPATH;
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rtnl_unlock();
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return vport;
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error_master_upper_dev_unlink:
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netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
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error_unlock:
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rtnl_unlock();
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error_put:
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dev_put(vport->dev);
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error_free_vport:
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ovs_vport_free(vport);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(ovs_netdev_link);
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static struct vport *netdev_create(const struct vport_parms *parms)
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{
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struct vport *vport;
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vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
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if (IS_ERR(vport))
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return vport;
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return ovs_netdev_link(vport, parms->name);
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}
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static void vport_netdev_free(struct rcu_head *rcu)
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{
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struct vport *vport = container_of(rcu, struct vport, rcu);
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if (vport->dev)
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dev_put(vport->dev);
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ovs_vport_free(vport);
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}
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void ovs_netdev_detach_dev(struct vport *vport)
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{
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ASSERT_RTNL();
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vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
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netdev_rx_handler_unregister(vport->dev);
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netdev_upper_dev_unlink(vport->dev,
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netdev_master_upper_dev_get(vport->dev));
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dev_set_promiscuity(vport->dev, -1);
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}
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EXPORT_SYMBOL_GPL(ovs_netdev_detach_dev);
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static void netdev_destroy(struct vport *vport)
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{
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rtnl_lock();
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if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
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ovs_netdev_detach_dev(vport);
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rtnl_unlock();
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call_rcu(&vport->rcu, vport_netdev_free);
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}
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void ovs_netdev_tunnel_destroy(struct vport *vport)
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{
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rtnl_lock();
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if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
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ovs_netdev_detach_dev(vport);
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/* We can be invoked by both explicit vport deletion and
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* underlying netdev deregistration; delete the link only
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* if it's not already shutting down.
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*/
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if (vport->dev->reg_state == NETREG_REGISTERED)
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rtnl_delete_link(vport->dev);
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dev_put(vport->dev);
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vport->dev = NULL;
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rtnl_unlock();
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call_rcu(&vport->rcu, vport_netdev_free);
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}
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EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
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/* Returns null if this device is not attached to a datapath. */
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struct vport *ovs_netdev_get_vport(struct net_device *dev)
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{
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if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
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return (struct vport *)
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rcu_dereference_rtnl(dev->rx_handler_data);
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else
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return NULL;
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}
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static struct vport_ops ovs_netdev_vport_ops = {
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.type = OVS_VPORT_TYPE_NETDEV,
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.create = netdev_create,
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.destroy = netdev_destroy,
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.send = dev_queue_xmit,
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};
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int __init ovs_netdev_init(void)
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{
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return ovs_vport_ops_register(&ovs_netdev_vport_ops);
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}
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void ovs_netdev_exit(void)
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{
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ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
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}
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