/**
* ovs_vport_set_upcall_portids - set upcall portids of @vport.
*
* @vport: vport to modify.
* @ids: new configuration, an array of port ids.
*
* Sets the vport's upcall_portids to @ids.
*
* Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed
* as an array of U32.
*
* Must be called with ovs_mutex.
*/
int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
{
struct vport_portids *old, *vport_portids;
if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
return -EINVAL;
//读保护, rcu_dereference_protected
old = ovsl_dereference(vport->upcall_portids);
vport_portids = kmalloc(sizeof *vport_portids + nla_len(ids),
GFP_KERNEL);
if (!vport_portids)
return -ENOMEM;
vport_portids->n_ids = nla_len(ids) / sizeof(u32);
vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids);
nla_memcpy(vport_portids->ids, ids, nla_len(ids));
rcu_assign_pointer(vport->upcall_portids, vport_portids);
if (old)
//等待 old 的所有读者都完成后, 是否 old 指向的内存
call_rcu(&old->rcu, vport_portids_destroy_rcu_cb);
return 0;
}
/* Called with ovs_mutex. */
void ovs_flow_stats_clear(struct sw_flow *flow)
{
int node;
for_each_node(node) {
struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
if (stats) {
spin_lock_bh(&stats->lock);
stats->used = 0;
stats->packet_count = 0;
stats->byte_count = 0;
stats->tcp_flags = 0;
spin_unlock_bh(&stats->lock);
}
}
}
/* Called with ovs_mutex. */
void bpf_dp_disconnect_port(struct vport *p)
{
struct datapath *dp = p->dp;
struct plum *plum, *dest_plum;
u32 dest;
if (p->port_no == OVSP_LOCAL || p->port_no >= PLUM_MAX_PORTS)
return;
plum = ovsl_dereference(dp->plums[0]);
dest = atomic_read(&plum->ports[p->port_no]);
if (dest) {
dest_plum = ovsl_dereference(dp->plums[dest >> 16]);
atomic_set(&dest_plum->ports[dest & 0xffff], 0);
}
atomic_set(&plum->ports[p->port_no], 0);
smp_wmb();
/* leave the stats allocated until plum is freed */
}
/**
* ovs_vport_set_upcall_portids - set upcall portids of @vport.
*
* @vport: vport to modify.
* @ids: new configuration, an array of port ids.
*
* Sets the vport's upcall_portids to @ids.
*
* Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed
* as an array of U32.
*
* Must be called with ovs_mutex.
*/
int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
{
struct vport_portids *old, *vport_portids;
if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
return -EINVAL;
old = ovsl_dereference(vport->upcall_portids);
vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids),
GFP_KERNEL);
if (!vport_portids)
return -ENOMEM;
vport_portids->n_ids = nla_len(ids) / sizeof(u32);
vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids);
nla_memcpy(vport_portids->ids, ids, nla_len(ids));
rcu_assign_pointer(vport->upcall_portids, vport_portids);
if (old)
kfree_rcu(old, rcu);
return 0;
}
void ovs_flow_tbl_destroy(struct flow_table *table)
{
struct table_instance *ti = ovsl_dereference(table->ti);
table_instance_destroy(ti, false);
}
