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vxlan: Restructure vxlan socket apis.

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Restructure vxlan-socket management APIs so that it can be
shared between vxlan and ovs modules.
This patch does not change any functionality.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
v6-v7:
 - get rid of zero refcnt vs from hashtable.
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2013-08-19 11:22:48 -07:00 committed by David S. Miller
parent 7559fb2fc5
commit 9c2e24e16f
1 changed files with 50 additions and 40 deletions
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90
drivers/net/vxlan.c
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@ -188,7 +188,7 @@ static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
}
/* Find VXLAN socket based on network namespace and UDP port */
static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port)
static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
{
struct vxlan_sock *vs;
@ -205,7 +205,7 @@ static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
struct vxlan_sock *vs;
struct vxlan_dev *vxlan;
vs = vxlan_find_port(net, port);
vs = vxlan_find_sock(net, port);
if (!vs)
return NULL;
@ -1365,25 +1365,31 @@ static void vxlan_cleanup(unsigned long arg)
mod_timer(&vxlan->age_timer, next_timer);
}
static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
{
__u32 vni = vxlan->default_dst.remote_vni;
vxlan->vn_sock = vs;
hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
}
/* Setup stats when device is created */
static int vxlan_init(struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
struct vxlan_sock *vs;
__u32 vni = vxlan->default_dst.remote_vni;
dev->tstats = alloc_percpu(struct pcpu_tstats);
if (!dev->tstats)
return -ENOMEM;
spin_lock(&vn->sock_lock);
vs = vxlan_find_port(dev_net(dev), vxlan->dst_port);
vs = vxlan_find_sock(dev_net(dev), vxlan->dst_port);
if (vs) {
/* If we have a socket with same port already, reuse it */
atomic_inc(&vs->refcnt);
vxlan->vn_sock = vs;
hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
vxlan_vs_add_dev(vs, vxlan);
} else {
/* otherwise make new socket outside of RTNL */
dev_hold(dev);
@ -1633,6 +1639,7 @@ static void vxlan_del_work(struct work_struct *work)
static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_sock *vs;
struct sock *sk;
struct sockaddr_in vxlan_addr = {
@ -1644,8 +1651,10 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
unsigned int h;
vs = kmalloc(sizeof(*vs), GFP_KERNEL);
if (!vs)
if (!vs) {
pr_debug("memory alocation failure\n");
return ERR_PTR(-ENOMEM);
}
for (h = 0; h < VNI_HASH_SIZE; ++h)
INIT_HLIST_HEAD(&vs->vni_list[h]);
@ -1673,57 +1682,57 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
kfree(vs);
return ERR_PTR(rc);
}
atomic_set(&vs->refcnt, 1);
/* Disable multicast loopback */
inet_sk(sk)->mc_loop = 0;
spin_lock(&vn->sock_lock);
hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
spin_unlock(&vn->sock_lock);
/* Mark socket as an encapsulation socket. */
udp_sk(sk)->encap_type = 1;
udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
udp_encap_enable();
atomic_set(&vs->refcnt, 1);
return vs;
}
static struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_sock *vs;
vs = vxlan_socket_create(net, port);
if (!IS_ERR(vs))
return vs;
spin_lock(&vn->sock_lock);
vs = vxlan_find_sock(net, port);
if (vs)
atomic_inc(&vs->refcnt);
else
vs = ERR_PTR(-EINVAL);
spin_unlock(&vn->sock_lock);
return vs;
}
/* Scheduled at device creation to bind to a socket */
static void vxlan_sock_work(struct work_struct *work)
{
struct vxlan_dev *vxlan
= container_of(work, struct vxlan_dev, sock_work);
struct net_device *dev = vxlan->dev;
struct net *net = dev_net(dev);
__u32 vni = vxlan->default_dst.remote_vni;
__be16 port = vxlan->dst_port;
struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
struct net *net = dev_net(vxlan->dev);
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_sock *nvs, *ovs;
nvs = vxlan_socket_create(net, port);
if (IS_ERR(nvs)) {
netdev_err(vxlan->dev, "Can not create UDP socket, %ld\n",
PTR_ERR(nvs));
goto out;
}
__be16 port = vxlan->dst_port;
struct vxlan_sock *nvs;
nvs = vxlan_sock_add(net, port);
spin_lock(&vn->sock_lock);
/* Look again to see if can reuse socket */
ovs = vxlan_find_port(net, port);
if (ovs) {
atomic_inc(&ovs->refcnt);
vxlan->vn_sock = ovs;
hlist_add_head_rcu(&vxlan->hlist, vni_head(ovs, vni));
spin_unlock(&vn->sock_lock);
if (!IS_ERR(nvs))
vxlan_vs_add_dev(nvs, vxlan);
spin_unlock(&vn->sock_lock);
sk_release_kernel(nvs->sock->sk);
kfree(nvs);
} else {
vxlan->vn_sock = nvs;
hlist_add_head_rcu(&nvs->hlist, vs_head(net, port));
hlist_add_head_rcu(&vxlan->hlist, vni_head(nvs, vni));
spin_unlock(&vn->sock_lock);
}
out:
dev_put(dev);
dev_put(vxlan->dev);
}
static int vxlan_newlink(struct net *net, struct net_device *dev,
@ -1838,7 +1847,8 @@ static void vxlan_dellink(struct net_device *dev, struct list_head *head)
struct vxlan_dev *vxlan = netdev_priv(dev);
spin_lock(&vn->sock_lock);
hlist_del_rcu(&vxlan->hlist);
if (!hlist_unhashed(&vxlan->hlist))
hlist_del_rcu(&vxlan->hlist);
spin_unlock(&vn->sock_lock);
list_del(&vxlan->next);