int __ovs_vport_ops_register(struct vport_ops *ops)
{
int err = -EEXIST;
struct vport_ops *o;
ovs_lock();
list_for_each_entry(o, &vport_ops_list, list)
if (ops->type == o->type)
goto errout;
list_add_tail(&ops->list, &vport_ops_list);
err = 0;
errout:
ovs_unlock();
return err;
}
/**
* ovs_vport_add - add vport device (for kernel callers)
*
* @parms: Information about new vport.
*
* Creates a new vport with the specified configuration (which is dependent on
* device type). ovs_mutex must be held.
*
* 创建并初始化 vport:
* 1. 参数校验
* * 确保 params->type 在 vport_ops_list(保持所有 vport->ops->type) 中, 返回类型为 params->type 的 ops
* * 确保 params->type->ops->owner 的模块是 alive 的
* 2. 调用 internal_dev_create(params) 创建 vport, 初始化各个数据成员及私有数据
* 3. 将 vport->hash_node 加入 dev_table
*
* 注: 没有初始化的 err_stats, detach_list
*/
struct vport *ovs_vport_add(const struct vport_parms *parms)
{
struct vport_ops *ops;
struct vport *vport;
//确保 params->type 在 vport_ops_list(保持所有 vport->ops->type) 中, 返回
//类型为 params->type 的 ops
ops = ovs_vport_lookup(parms);
if (ops) {
struct hlist_head *bucket;
//ops->owner 的模块是 alive 的
if (!try_module_get(ops->owner))
return ERR_PTR(-EAFNOSUPPORT);
//调用 internal_dev_create 创建 vport, 初始化各个数据成员及私有数据
vport = ops->create(parms);
if (IS_ERR(vport)) {
// ops->owener->refcnt = ops->owener->refcnt - 1
module_put(ops->owner);
return vport;
}
bucket = hash_bucket(ovs_dp_get_net(vport->dp),
vport->ops->get_name(vport));
hlist_add_head_rcu(&vport->hash_node, bucket);
return vport;
}
/* Unlock to attempt module load and return -EAGAIN if load
* was successful as we need to restart the port addition
* workflow.
*/
ovs_unlock();
request_module("vport-type-%d", parms->type);
ovs_lock();
if (!ovs_vport_lookup(parms))
return ERR_PTR(-EAFNOSUPPORT);
else
return ERR_PTR(-EAGAIN);
}
/**
* ovs_vport_add - add vport device (for kernel callers)
*
* @parms: Information about new vport.
*
* Creates a new vport with the specified configuration (which is dependent on
* device type). ovs_mutex must be held.
*/
struct vport *ovs_vport_add(const struct vport_parms *parms)
{
struct vport_ops *ops;
struct vport *vport;
ops = ovs_vport_lookup(parms);
if (ops) {
struct hlist_head *bucket;
if (!try_module_get(ops->owner))
return ERR_PTR(-EAFNOSUPPORT);
vport = ops->create(parms);
if (IS_ERR(vport)) {
module_put(ops->owner);
return vport;
}
bucket = hash_bucket(ovs_dp_get_net(vport->dp),
ovs_vport_name(vport));
hlist_add_head_rcu(&vport->hash_node, bucket);
return vport;
}
if (parms->type == OVS_VPORT_TYPE_GRE && !compat_gre_loaded) {
pr_warn("GRE protocol already loaded!\n");
return ERR_PTR(-EAFNOSUPPORT);
}
/* Unlock to attempt module load and return -EAGAIN if load
* was successful as we need to restart the port addition
* workflow.
*/
ovs_unlock();
request_module("vport-type-%d", parms->type);
ovs_lock();
if (!ovs_vport_lookup(parms))
return ERR_PTR(-EAFNOSUPPORT);
else
return ERR_PTR(-EAGAIN);
}
void ovs_vport_ops_unregister(struct vport_ops *ops)
{
ovs_lock();
list_del(&ops->list);
ovs_unlock();
}
