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net: vlan: add 802.1ad support 

Add support for 802.1ad VLAN devices. This mainly consists of checking for
ETH_P_8021AD in addition to ETH_P_8021Q in a couple of places and check
offloading capabilities based on the used protocol.

Configuration is done using "ip link":

# ip link add link eth0 eth0.1000 \
	type vlan proto 802.1ad id 1000
# ip link add link eth0.1000 eth0.1000.1000 \
	type vlan proto 802.1q id 1000

52:54:00:12:34:56 > 92:b1:54:28:e4:8c, ethertype 802.1Q (0x8100), length 106: vlan 1000, p 0, ethertype 802.1Q, vlan 1000, p 0, ethertype IPv4, (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
    20.1.0.2 > 20.1.0.1: ICMP echo request, id 3003, seq 8, length 64
92:b1:54:28:e4:8c > 52:54:00:12:34:56, ethertype 802.1Q-QinQ (0x88a8), length 106: vlan 1000, p 0, ethertype 802.1Q, vlan 1000, p 0, ethertype IPv4, (tos 0x0, ttl 64, id 47944, offset 0, flags [none], proto ICMP (1), length 84)
    20.1.0.1 > 20.1.0.2: ICMP echo reply, id 3003, seq 8, length 64

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2013-04-19 02:04:31 +00:00 committed by David S. Miller
parent 86a9bad3ab
commit 8ad227ff89
8 changed files with 61 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/if_vlan.h
View File

@ -162,6 +162,8 @@ static inline bool vlan_hw_offload_capable(netdev_features_t features,
{
if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
return true;
if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
return true;
return false;
}
@ -271,9 +273,9 @@ static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
{
struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
if (veth->h_vlan_proto != htons(ETH_P_8021Q) &&
veth->h_vlan_proto != htons(ETH_P_8021AD))
return -EINVAL;
}
*vlan_tci = ntohs(veth->h_vlan_TCI);
return 0;

6
include/linux/netdev_features.h
View File

@ -25,6 +25,9 @@ enum {
NETIF_F_HW_VLAN_CTAG_TX_BIT, /* Transmit VLAN CTAG HW acceleration */
NETIF_F_HW_VLAN_CTAG_RX_BIT, /* Receive VLAN CTAG HW acceleration */
NETIF_F_HW_VLAN_CTAG_FILTER_BIT,/* Receive filtering on VLAN CTAGs */
NETIF_F_HW_VLAN_STAG_TX_BIT, /* Transmit VLAN STAG HW acceleration */
NETIF_F_HW_VLAN_STAG_RX_BIT, /* Receive VLAN STAG HW acceleration */
NETIF_F_HW_VLAN_STAG_FILTER_BIT,/* Receive filtering on VLAN STAGs */
NETIF_F_VLAN_CHALLENGED_BIT, /* Device cannot handle VLAN packets */
NETIF_F_GSO_BIT, /* Enable software GSO. */
NETIF_F_LLTX_BIT, /* LockLess TX - deprecated. Please */
@ -83,6 +86,9 @@ enum {
#define NETIF_F_HW_VLAN_CTAG_FILTER __NETIF_F(HW_VLAN_CTAG_FILTER)
#define NETIF_F_HW_VLAN_CTAG_RX __NETIF_F(HW_VLAN_CTAG_RX)
#define NETIF_F_HW_VLAN_CTAG_TX __NETIF_F(HW_VLAN_CTAG_TX)
#define NETIF_F_HW_VLAN_STAG_FILTER __NETIF_F(HW_VLAN_STAG_FILTER)
#define NETIF_F_HW_VLAN_STAG_RX __NETIF_F(HW_VLAN_STAG_RX)
#define NETIF_F_HW_VLAN_STAG_TX __NETIF_F(HW_VLAN_STAG_TX)
#define NETIF_F_IP_CSUM __NETIF_F(IP_CSUM)
#define NETIF_F_IPV6_CSUM __NETIF_F(IPV6_CSUM)
#define NETIF_F_LLTX __NETIF_F(LLTX)

1
include/uapi/linux/if_link.h
View File

@ -250,6 +250,7 @@ enum {
IFLA_VLAN_FLAGS,
IFLA_VLAN_EGRESS_QOS,
IFLA_VLAN_INGRESS_QOS,
IFLA_VLAN_PROTOCOL,
__IFLA_VLAN_MAX,
};

2
net/8021q/Kconfig
View File

@ -3,7 +3,7 @@
#
config VLAN_8021Q
tristate "802.1Q VLAN Support"
tristate "802.1Q/802.1ad VLAN Support"
---help---
Select this and you will be able to create 802.1Q VLAN interfaces
on your ethernet interfaces. 802.1Q VLAN supports almost

3
net/8021q/vlan.h
View File

@ -91,6 +91,7 @@ static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
enum vlan_protos {
VLAN_PROTO_8021Q = 0,
VLAN_PROTO_8021AD,
VLAN_PROTO_NUM,
};
@ -116,6 +117,8 @@ static inline unsigned int vlan_proto_idx(__be16 proto)
switch (proto) {
case __constant_htons(ETH_P_8021Q):
return VLAN_PROTO_8021Q;
case __constant_htons(ETH_P_8021AD):
return VLAN_PROTO_8021AD;
default:
BUG();
}

18
net/8021q/vlan_core.c
View File

@ -194,6 +194,18 @@ struct vlan_vid_info {
int refcount;
};
static bool vlan_hw_filter_capable(const struct net_device *dev,
const struct vlan_vid_info *vid_info)
{
if (vid_info->proto == htons(ETH_P_8021Q) &&
dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
return true;
if (vid_info->proto == htons(ETH_P_8021AD) &&
dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
return true;
return false;
}
static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
__be16 proto, u16 vid)
{
@ -231,8 +243,7 @@ static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
if (!vid_info)
return -ENOMEM;
if (proto == htons(ETH_P_8021Q) &&
dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) {
if (vlan_hw_filter_capable(dev, vid_info)) {
err = ops->ndo_vlan_rx_add_vid(dev, proto, vid);
if (err) {
kfree(vid_info);
@ -290,8 +301,7 @@ static void __vlan_vid_del(struct vlan_info *vlan_info,
u16 vid = vid_info->vid;
int err;
if (proto == htons(ETH_P_8021Q) &&
dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) {
if (vlan_hw_filter_capable(dev, vid_info)) {
err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
if (err) {
pr_warn("failed to kill vid %04x/%d for device %s\n",

25
net/8021q/vlan_netlink.c
View File

@ -23,6 +23,7 @@ static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
[IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) },
[IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED },
[IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
[IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 },
};
static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
@ -53,6 +54,16 @@ static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
if (!data)
return -EINVAL;
if (data[IFLA_VLAN_PROTOCOL]) {
switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
case __constant_htons(ETH_P_8021Q):
case __constant_htons(ETH_P_8021AD):
break;
default:
return -EPROTONOSUPPORT;
}
}
if (data[IFLA_VLAN_ID]) {
id = nla_get_u16(data[IFLA_VLAN_ID]);
if (id >= VLAN_VID_MASK)
@ -107,6 +118,7 @@ static int vlan_newlink(struct net *src_net, struct net_device *dev,
{
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
struct net_device *real_dev;
__be16 proto;
int err;
if (!data[IFLA_VLAN_ID])
@ -118,7 +130,12 @@ static int vlan_newlink(struct net *src_net, struct net_device *dev,
if (!real_dev)
return -ENODEV;
vlan->vlan_proto = htons(ETH_P_8021Q);
if (data[IFLA_VLAN_PROTOCOL])
proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
else
proto = htons(ETH_P_8021Q);
vlan->vlan_proto = proto;
vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
vlan->real_dev = real_dev;
vlan->flags = VLAN_FLAG_REORDER_HDR;
@ -152,7 +169,8 @@ static size_t vlan_get_size(const struct net_device *dev)
{
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
return nla_total_size(2) + /* IFLA_VLAN_ID */
return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
nla_total_size(2) + /* IFLA_VLAN_ID */
sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */
vlan_qos_map_size(vlan->nr_ingress_mappings) +
vlan_qos_map_size(vlan->nr_egress_mappings);
@ -167,7 +185,8 @@ static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
struct nlattr *nest;
unsigned int i;
if (nla_put_u16(skb, IFLA_VLAN_ID, vlan_dev_priv(dev)->vlan_id))
if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
goto nla_put_failure;
if (vlan->flags) {
f.flags = vlan->flags;

16
net/core/dev.c
View File

@ -2212,7 +2212,7 @@ __be16 skb_network_protocol(struct sk_buff *skb)
__be16 type = skb->protocol;
int vlan_depth = ETH_HLEN;
while (type == htons(ETH_P_8021Q)) {
while (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) {
struct vlan_hdr *vh;
if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
@ -2428,20 +2428,22 @@ netdev_features_t netif_skb_features(struct sk_buff *skb)
if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
features &= ~NETIF_F_GSO_MASK;
if (protocol == htons(ETH_P_8021Q)) {
if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) {
struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
protocol = veh->h_vlan_encapsulated_proto;
} else if (!vlan_tx_tag_present(skb)) {
return harmonize_features(skb, protocol, features);
}
features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX);
features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_HW_VLAN_STAG_TX);
if (protocol != htons(ETH_P_8021Q)) {
if (protocol != htons(ETH_P_8021Q) && protocol != htons(ETH_P_8021AD)) {
return harmonize_features(skb, protocol, features);
} else {
features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_CTAG_TX;
NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_HW_VLAN_STAG_TX;
return harmonize_features(skb, protocol, features);
}
}
@ -3360,6 +3362,7 @@ static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
case __constant_htons(ETH_P_IP):
case __constant_htons(ETH_P_IPV6):
case __constant_htons(ETH_P_8021Q):
case __constant_htons(ETH_P_8021AD):
return true;
default:
return false;
@ -3400,7 +3403,8 @@ another_round:
__this_cpu_inc(softnet_data.processed);
if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
skb = vlan_untag(skb);
if (unlikely(!skb))
goto unlock;