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mlxsw: spectrum: Support decap-only IP-in-IP tunnels 

Current code for offloading IP-in-IP tunneling assumes that there is no
decap without encap. But that's never true for IPv6 overlays, and is not
true for IPv4 ones either, if net.ipv4.conf.*.rp_filter is unset.

To support decap-only tunnels, an IPIP entry is now created as soon as
an offloadable tunneling device is created. When that netdevice is up'd,
a decap route is looked up and possibly offloaded. Thus decap is not
handled implicitly as part of mlxsw_sp_ipip_entry_get() call anymore,
but needs to be done explicitly after the get, if desired.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2017-10-16 16:26:37 +02:00 committed by David S. Miller
parent 6698c168bf
commit 0063587d35
3 changed files with 109 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/ethernet/mellanox/mlxsw/spectrum.c
View File

@ -4497,13 +4497,17 @@ static bool mlxsw_sp_is_vrf_event(unsigned long event, void *ptr)
return netif_is_l3_master(info->upper_dev);
}
static int mlxsw_sp_netdevice_event(struct notifier_block *unused,
static int mlxsw_sp_netdevice_event(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct mlxsw_sp *mlxsw_sp;
int err = 0;
if (event == NETDEV_CHANGEADDR || event == NETDEV_CHANGEMTU)
mlxsw_sp = container_of(nb, struct mlxsw_sp, netdevice_nb);
if (mlxsw_sp_netdev_is_ipip(mlxsw_sp, dev))
err = mlxsw_sp_netdevice_ipip_event(mlxsw_sp, dev, event);
else if (event == NETDEV_CHANGEADDR || event == NETDEV_CHANGEMTU)
err = mlxsw_sp_netdevice_router_port_event(dev);
else if (mlxsw_sp_is_vrf_event(event, ptr))
err = mlxsw_sp_netdevice_vrf_event(dev, event, ptr);

6
drivers/net/ethernet/mellanox/mlxsw/spectrum.h
View File

@ -395,6 +395,12 @@ int mlxsw_sp_inet6addr_event(struct notifier_block *unused,
unsigned long event, void *ptr);
int mlxsw_sp_netdevice_vrf_event(struct net_device *l3_dev, unsigned long event,
struct netdev_notifier_changeupper_info *info);
bool mlxsw_sp_netdev_is_ipip(const struct mlxsw_sp *mlxsw_sp,
const struct net_device *dev);
int
mlxsw_sp_netdevice_ipip_event(struct mlxsw_sp *mlxsw_sp,
struct net_device *l3_dev,
unsigned long event);
void
mlxsw_sp_port_vlan_router_leave(struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan);
void mlxsw_sp_rif_destroy(struct mlxsw_sp_rif *rif);

105
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
View File

@ -1206,7 +1206,6 @@ mlxsw_sp_ipip_entry_get(struct mlxsw_sp *mlxsw_sp,
{
u32 ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(ol_dev);
struct mlxsw_sp_router *router = mlxsw_sp->router;
struct mlxsw_sp_fib_entry *decap_fib_entry;
struct mlxsw_sp_ipip_entry *ipip_entry;
enum mlxsw_sp_l3proto ul_proto;
union mlxsw_sp_l3addr saddr;
@ -1231,11 +1230,6 @@ mlxsw_sp_ipip_entry_get(struct mlxsw_sp *mlxsw_sp,
if (IS_ERR(ipip_entry))
return ipip_entry;
decap_fib_entry = mlxsw_sp_ipip_entry_find_decap(mlxsw_sp, ipip_entry);
if (decap_fib_entry)
mlxsw_sp_ipip_entry_promote_decap(mlxsw_sp, ipip_entry,
decap_fib_entry);
list_add_tail(&ipip_entry->ipip_list_node,
&mlxsw_sp->router->ipip_list);
@ -1250,8 +1244,6 @@ mlxsw_sp_ipip_entry_put(struct mlxsw_sp *mlxsw_sp,
{
if (--ipip_entry->ref_count == 0) {
list_del(&ipip_entry->ipip_list_node);
if (ipip_entry->decap_fib_entry)
mlxsw_sp_ipip_entry_demote_decap(mlxsw_sp, ipip_entry);
mlxsw_sp_ipip_entry_destroy(ipip_entry);
}
}
@ -1314,6 +1306,103 @@ static bool mlxsw_sp_netdev_ipip_type(const struct mlxsw_sp *mlxsw_sp,
return false;
}
bool mlxsw_sp_netdev_is_ipip(const struct mlxsw_sp *mlxsw_sp,
const struct net_device *dev)
{
return mlxsw_sp_netdev_ipip_type(mlxsw_sp, dev, NULL);
}
static struct mlxsw_sp_ipip_entry *
mlxsw_sp_ipip_entry_find_by_ol_dev(struct mlxsw_sp *mlxsw_sp,
const struct net_device *ol_dev)
{
struct mlxsw_sp_ipip_entry *ipip_entry;
list_for_each_entry(ipip_entry, &mlxsw_sp->router->ipip_list,
ipip_list_node)
if (ipip_entry->ol_dev == ol_dev)
return ipip_entry;
return NULL;
}
static int mlxsw_sp_netdevice_ipip_reg_event(struct mlxsw_sp *mlxsw_sp,
struct net_device *ol_dev)
{
struct mlxsw_sp_router *router = mlxsw_sp->router;
struct mlxsw_sp_ipip_entry *ipip_entry;
enum mlxsw_sp_ipip_type ipipt;
mlxsw_sp_netdev_ipip_type(mlxsw_sp, ol_dev, &ipipt);
if (router->ipip_ops_arr[ipipt]->can_offload(mlxsw_sp, ol_dev,
MLXSW_SP_L3_PROTO_IPV4) ||
router->ipip_ops_arr[ipipt]->can_offload(mlxsw_sp, ol_dev,
MLXSW_SP_L3_PROTO_IPV6)) {
ipip_entry = mlxsw_sp_ipip_entry_get(mlxsw_sp, ipipt, ol_dev);
if (IS_ERR(ipip_entry))
return PTR_ERR(ipip_entry);
}
return 0;
}
static void mlxsw_sp_netdevice_ipip_unreg_event(struct mlxsw_sp *mlxsw_sp,
struct net_device *ol_dev)
{
struct mlxsw_sp_ipip_entry *ipip_entry;
ipip_entry = mlxsw_sp_ipip_entry_find_by_ol_dev(mlxsw_sp, ol_dev);
if (ipip_entry)
mlxsw_sp_ipip_entry_put(mlxsw_sp, ipip_entry);
}
static int mlxsw_sp_netdevice_ipip_up_event(struct mlxsw_sp *mlxsw_sp,
struct net_device *ol_dev)
{
struct mlxsw_sp_fib_entry *decap_fib_entry;
struct mlxsw_sp_ipip_entry *ipip_entry;
ipip_entry = mlxsw_sp_ipip_entry_find_by_ol_dev(mlxsw_sp, ol_dev);
if (ipip_entry) {
decap_fib_entry = mlxsw_sp_ipip_entry_find_decap(mlxsw_sp,
ipip_entry);
if (decap_fib_entry)
mlxsw_sp_ipip_entry_promote_decap(mlxsw_sp, ipip_entry,
decap_fib_entry);
}
return 0;
}
static void mlxsw_sp_netdevice_ipip_down_event(struct mlxsw_sp *mlxsw_sp,
struct net_device *ol_dev)
{
struct mlxsw_sp_ipip_entry *ipip_entry;
ipip_entry = mlxsw_sp_ipip_entry_find_by_ol_dev(mlxsw_sp, ol_dev);
if (ipip_entry && ipip_entry->decap_fib_entry)
mlxsw_sp_ipip_entry_demote_decap(mlxsw_sp, ipip_entry);
}
int mlxsw_sp_netdevice_ipip_event(struct mlxsw_sp *mlxsw_sp,
struct net_device *ol_dev,
unsigned long event)
{
switch (event) {
case NETDEV_REGISTER:
return mlxsw_sp_netdevice_ipip_reg_event(mlxsw_sp, ol_dev);
case NETDEV_UNREGISTER:
mlxsw_sp_netdevice_ipip_unreg_event(mlxsw_sp, ol_dev);
return 0;
case NETDEV_UP:
return mlxsw_sp_netdevice_ipip_up_event(mlxsw_sp, ol_dev);
case NETDEV_DOWN:
mlxsw_sp_netdevice_ipip_down_event(mlxsw_sp, ol_dev);
return 0;
}
return 0;
}
struct mlxsw_sp_neigh_key {
struct neighbour *n;
};