/*
* Add entries in sysfs onto the existing network class device
* for the bridge.
* Adds a attribute group "bridge" containing tuning parameters.
* Sub directory to hold links to interfaces.
*
* Note: the ifobj exists only to be a subdirectory
* to hold links. The ifobj exists in the same data structure
* as its parent the bridge so reference counting works.
*/
int ovs_dp_sysfs_add_dp(struct datapath *dp)
{
struct vport *vport = ovs_vport_rtnl(dp, OVSP_LOCAL);
struct kobject *kobj = vport->ops->get_kobj(vport);
int err;
#ifdef CONFIG_NET_NS
/* Due to bug in 2.6.32 kernel, sysfs_create_group() could panic
* in other namespace than init_net. Following check is to avoid it. */
if (!kobj->sd)
return -ENOENT;
#endif
/* Create /sys/class/net/<devname>/bridge directory. */
err = sysfs_create_group(kobj, &bridge_group);
if (err) {
pr_info("%s: can't create group %s/%s\n",
__func__, ovs_dp_name(dp), bridge_group.name);
goto out1;
}
/* Create /sys/class/net/<devname>/brif directory. */
err = kobject_add(&dp->ifobj, kobj, SYSFS_BRIDGE_PORT_SUBDIR);
if (err) {
pr_info("%s: can't add kobject (directory) %s/%s\n",
__func__, ovs_dp_name(dp), kobject_name(&dp->ifobj));
goto out2;
}
kobject_uevent(&dp->ifobj, KOBJ_ADD);
return 0;
out2:
sysfs_remove_group(kobj, &bridge_group);
out1:
return err;
}
static int netdev_send(struct vport *vport, struct sk_buff *skb)
{
struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
int mtu = netdev_vport->dev->mtu;
int len;
if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
ovs_dp_name(vport->dp),
packet_length(skb), mtu);
goto error;
}
if (unlikely(skb_warn_if_lro(skb)))
goto error;
skb->dev = netdev_vport->dev;
len = skb->len;
dev_queue_xmit(skb);
return len;
error:
kfree_skb(skb);
ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
return 0;
}
static int loop_suppress(struct datapath *dp, struct sw_flow_actions *actions)
{
if (net_ratelimit())
pr_warn("%s: flow looped %d times, dropping\n",
ovs_dp_name(dp), MAX_LOOPS);
actions->actions_len = 0;
return -ELOOP;
}
static ssize_t store_group_addr(DEVICE_PARAMS,
const char *buf, size_t len)
{
struct datapath *dp;
ssize_t result = len;
rcu_read_lock();
dp = sysfs_get_dp(to_net_dev(d));
if (dp)
pr_info("%s: xxx attempt to store_group_addr()\n",
ovs_dp_name(dp));
else
result = -ENODEV;
rcu_read_unlock();
return result;
}
/*
* Common code for storing bridge parameters.
*/
static ssize_t store_bridge_parm(DEVICE_PARAMS,
const char *buf, size_t len,
void (*set)(struct datapath *, unsigned long))
{
char *endp;
unsigned long val;
ssize_t result = len;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
val = simple_strtoul(buf, &endp, 0);
if (endp == buf)
return -EINVAL;
/* xxx We use a default value of 0 for all fields. If the caller is
* xxx attempting to set the value to our default, just silently
* xxx ignore the request.
*/
if (val != 0) {
struct datapath *dp;
rcu_read_lock();
dp = sysfs_get_dp(to_net_dev(d));
if (dp)
pr_warning("%s: xxx writing dp parms not supported yet!\n",
ovs_dp_name(dp));
else
result = -ENODEV;
rcu_read_unlock();
}
return result;
}
static int netdev_send(struct vport *vport, struct sk_buff *skb)
{
struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
int mtu = netdev_vport->dev->mtu;
int len;
if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
if (net_ratelimit())
pr_warn("%s: dropped over-mtu packet: %d > %d\n",
ovs_dp_name(vport->dp), packet_length(skb), mtu);
goto error;
}
if (unlikely(skb_warn_if_lro(skb)))
goto error;
skb->dev = netdev_vport->dev;
forward_ip_summed(skb, true);
if (vlan_tx_tag_present(skb) && !dev_supports_vlan_tx(skb->dev)) {
int features;
features = netif_skb_features(skb);
if (!vlan_tso)
features &= ~(NETIF_F_TSO | NETIF_F_TSO6 |
NETIF_F_UFO | NETIF_F_FSO);
if (netif_needs_gso(skb, features)) {
struct sk_buff *nskb;
nskb = skb_gso_segment(skb, features);
if (!nskb) {
if (unlikely(skb_cloned(skb) &&
pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) {
kfree_skb(skb);
return 0;
}
skb_shinfo(skb)->gso_type &= ~SKB_GSO_DODGY;
goto tag;
}
if (IS_ERR(nskb)) {
kfree_skb(skb);
return 0;
}
consume_skb(skb);
skb = nskb;
len = 0;
do {
nskb = skb->next;
skb->next = NULL;
skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
if (likely(skb)) {
len += skb->len;
vlan_set_tci(skb, 0);
dev_queue_xmit(skb);
}
skb = nskb;
} while (skb);
return len;
}
tag:
skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
if (unlikely(!skb))
return 0;
vlan_set_tci(skb, 0);
}
len = skb->len;
dev_queue_xmit(skb);
return len;
error:
kfree_skb(skb);
ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
return 0;
}
static void set_priority(struct datapath *dp, unsigned long val)
{
pr_info("%s: xxx attempt to set_priority()\n", ovs_dp_name(dp));
}
static void set_ageing_time(struct datapath *dp, unsigned long val)
{
pr_info("%s: xxx attempt to set_ageing_time()\n", ovs_dp_name(dp));
}