/**
* ovs_vport_del - delete existing vport device
*
* @vport: vport to delete.
*
* Detaches @vport from its datapath and destroys it. It is possible to fail
* for reasons such as lack of memory. ovs_mutex must be held.
*/
void ovs_vport_del(struct vport *vport)
{
ASSERT_OVSL();
hlist_del_rcu(&vport->hash_node);
vport->ops->destroy(vport);
}
void vxbox_flow_free(struct sw_flow *flow, bool deferred)
{
if (!flow)
return;
if (flow->mask) {
struct sw_flow_mask *mask = flow->mask;
/* vxbox-lock is required to protect mask-refcount and
* mask list. */
ASSERT_OVSL();
BUG_ON(!mask->ref_count);
mask->ref_count--;
if (!mask->ref_count) {
list_del_rcu(&mask->list);
if (deferred)
call_rcu(&mask->rcu, rcu_free_sw_flow_mask_cb);
else
kfree(mask);
}
}
if (deferred)
call_rcu(&flow->rcu, rcu_free_flow_callback);
else
flow_free(flow);
}
/**
* ovs_vport_del - delete existing vport device
*
* @vport: vport to delete.
*
* Detaches @vport from its datapath and destroys it. It is possible to fail
* for reasons such as lack of memory. ovs_mutex must be held.
*/
void ovs_vport_del(struct vport *vport)
{
ASSERT_OVSL();
//将 vport->hash_node 从其对应的链表中删除;
hlist_del_rcu(&vport->hash_node);
//递减 vport->ops->owner 的引用计数
module_put(vport->ops->owner);
vport->ops->destroy(vport);
}
void vxlan_sock_release(struct vxlan_sock *vs)
{
ASSERT_OVSL();
queue_work(system_wq, &vs->del_work);
}
static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
vxlan_rcv_t *rcv, void *data)
{
struct vxlan_sock *vs;
struct sock *sk;
struct sockaddr_in vxlan_addr = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_ANY),
.sin_port = port,
};
int rc;
vs = kmalloc(sizeof(*vs), GFP_KERNEL);
if (!vs) {
pr_debug("memory alocation failure\n");
return ERR_PTR(-ENOMEM);
}
INIT_WORK(&vs->del_work, vxlan_del_work);
/* Create UDP socket for encapsulation receive. */
rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock);
if (rc < 0) {
pr_debug("UDP socket create failed\n");
kfree(vs);
return ERR_PTR(rc);
}
/* Put in proper namespace */
sk = vs->sock->sk;
sk_change_net(sk, net);
rc = kernel_bind(vs->sock, (struct sockaddr *) &vxlan_addr,
sizeof(vxlan_addr));
if (rc < 0) {
pr_debug("bind for UDP socket %pI4:%u (%d)\n",
&vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
sk_release_kernel(sk);
kfree(vs);
return ERR_PTR(rc);
}
vs->rcv = rcv;
vs->data = data;
/* Disable multicast loopback */
inet_sk(sk)->mc_loop = 0;
rcu_assign_sk_user_data(vs->sock->sk, vs);
/* Mark socket as an encapsulation socket. */
udp_sk(sk)->encap_type = 1;
udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
udp_encap_enable();
return vs;
}
struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
vxlan_rcv_t *rcv, void *data,
bool no_share, u32 flags)
{
return vxlan_socket_create(net, port, rcv, data);
}
void vxlan_sock_release(struct vxlan_sock *vs)
{
ASSERT_OVSL();
rcu_assign_sk_user_data(vs->sock->sk, NULL);
queue_work(system_wq, &vs->del_work);
}