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net: vlan: add protocol argument to packet tagging functions

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Add a protocol argument to the VLAN packet tagging functions. In case of HW
tagging, we need that protocol available in the ndo_start_xmit functions,
so it is stored in a new field in the skb. The new field fits into a hole
(on 64 bit) and doesn't increase the sks's size.

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 02:04:30 +00:00
committed by David S. Miller
parent 1fd9b1fc31
commit 86a9bad3ab
56 changed files with 107 additions and 84 deletions
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33
include/linux/if_vlan.h
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@@ -157,9 +157,18 @@ static inline bool vlan_uses_dev(const struct net_device *dev)
}
#endif
static inline bool vlan_hw_offload_capable(netdev_features_t features,
__be16 proto)
{
if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
return true;
return false;
}
/**
* vlan_insert_tag - regular VLAN tag inserting
* @skb: skbuff to tag
* @vlan_proto: VLAN encapsulation protocol
* @vlan_tci: VLAN TCI to insert
*
* Inserts the VLAN tag into @skb as part of the payload
@@ -170,7 +179,8 @@ static inline bool vlan_uses_dev(const struct net_device *dev)
*
* Does not change skb->protocol so this function can be used during receive.
*/
static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, u16 vlan_tci)
static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
__be16 vlan_proto, u16 vlan_tci)
{
struct vlan_ethhdr *veth;
@@ -185,7 +195,7 @@ static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, u16 vlan_tci)
skb->mac_header -= VLAN_HLEN;
/* first, the ethernet type */
veth->h_vlan_proto = htons(ETH_P_8021Q);
veth->h_vlan_proto = vlan_proto;
/* now, the TCI */
veth->h_vlan_TCI = htons(vlan_tci);
@@ -204,24 +214,28 @@ static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, u16 vlan_tci)
* Following the skb_unshare() example, in case of error, the calling function
* doesn't have to worry about freeing the original skb.
*/
static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb,
__be16 vlan_proto, u16 vlan_tci)
{
skb = vlan_insert_tag(skb, vlan_tci);
skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
if (skb)
skb->protocol = htons(ETH_P_8021Q);
skb->protocol = vlan_proto;
return skb;
}
/**
* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
* @skb: skbuff to tag
* @vlan_proto: VLAN encapsulation protocol
* @vlan_tci: VLAN TCI to insert
*
* Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
*/
static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb,
__be16 vlan_proto,
u16 vlan_tci)
{
skb->vlan_proto = vlan_proto;
skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
return skb;
}
@@ -236,12 +250,13 @@ static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb,
* Assumes skb->dev is the target that will xmit this frame.
* Returns a VLAN tagged skb.
*/
static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb,
__be16 vlan_proto, u16 vlan_tci)
{
if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
return __vlan_hwaccel_put_tag(skb, vlan_tci);
if (vlan_hw_offload_capable(skb->dev->features, vlan_proto)) {
return __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci);
} else {
return __vlan_put_tag(skb, vlan_tci);
return __vlan_put_tag(skb, vlan_proto, vlan_tci);
}
}