leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

vlan: Add GRO interfaces

Browse Source 
This patch adds GRO interfaces for hardware-assisted VLAN reception.
With this in place we're now at parity with LRO as far as the
interface is concerned.  That is, you can now take any LRO driver
and convert it over to GRO.

As the CB memory clashes with GRO's use of CB, I've removed it
entirely by storing dev in skb->dev.  This is OK because VLAN
gets called first thing in netif_receive_skb and skb->dev is
not used in between us calling netif_rx and netif_receive_skb
getting called.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2009-01-06 10:50:09 -08:00 committed by David S. Miller
parent 96e93eab20
commit e1c096e251
2 changed files with 107 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/linux/if_vlan.h
View File

@ -115,6 +115,11 @@ extern u16 vlan_dev_vlan_id(const struct net_device *dev);
extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
u16 vlan_tci, int polling);
extern int vlan_hwaccel_do_receive(struct sk_buff *skb);
extern int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
unsigned int vlan_tci, struct sk_buff *skb);
extern int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
unsigned int vlan_tci,
struct napi_gro_fraginfo *info);
#else
static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
@ -140,6 +145,20 @@ static inline int vlan_hwaccel_do_receive(struct sk_buff *skb)
{
return 0;
}
static inline int vlan_gro_receive(struct napi_struct *napi,
struct vlan_group *grp,
unsigned int vlan_tci, struct sk_buff *skb)
{
return NET_RX_DROP;
}
static inline int vlan_gro_frags(struct napi_struct *napi,
struct vlan_group *grp, unsigned int vlan_tci,
struct napi_gro_fraginfo *info)
{
return NET_RX_DROP;
}
#endif
/**

111
net/8021q/vlan_core.c
View File

@ -3,46 +3,35 @@
#include <linux/if_vlan.h>
#include "vlan.h"
struct vlan_hwaccel_cb {
struct net_device *dev;
};
static inline struct vlan_hwaccel_cb *vlan_hwaccel_cb(struct sk_buff *skb)
{
return (struct vlan_hwaccel_cb *)skb->cb;
}
/* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */
int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
u16 vlan_tci, int polling)
{
struct vlan_hwaccel_cb *cb = vlan_hwaccel_cb(skb);
if (skb_bond_should_drop(skb)) {
dev_kfree_skb_any(skb);
return NET_RX_DROP;
}
if (skb_bond_should_drop(skb))
goto drop;
skb->vlan_tci = vlan_tci;
cb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
if (!skb->dev)
goto drop;
return (polling ? netif_receive_skb(skb) : netif_rx(skb));
drop:
dev_kfree_skb_any(skb);
return NET_RX_DROP;
}
EXPORT_SYMBOL(__vlan_hwaccel_rx);
int vlan_hwaccel_do_receive(struct sk_buff *skb)
{
struct vlan_hwaccel_cb *cb = vlan_hwaccel_cb(skb);
struct net_device *dev = cb->dev;
struct net_device *dev = skb->dev;
struct net_device_stats *stats;
skb->dev = vlan_dev_info(dev)->real_dev;
netif_nit_deliver(skb);
if (dev == NULL) {
kfree_skb(skb);
return -1;
}
skb->dev = dev;
skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
skb->vlan_tci = 0;
@ -80,3 +69,79 @@ u16 vlan_dev_vlan_id(const struct net_device *dev)
return vlan_dev_info(dev)->vlan_id;
}
EXPORT_SYMBOL_GPL(vlan_dev_vlan_id);
static int vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
unsigned int vlan_tci, struct sk_buff *skb)
{
struct sk_buff *p;
if (skb_bond_should_drop(skb))
goto drop;
skb->vlan_tci = vlan_tci;
skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
if (!skb->dev)
goto drop;
for (p = napi->gro_list; p; p = p->next) {
NAPI_GRO_CB(p)->same_flow = p->dev == skb->dev;
NAPI_GRO_CB(p)->flush = 0;
}
return dev_gro_receive(napi, skb);
drop:
return 2;
}
int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
unsigned int vlan_tci, struct sk_buff *skb)
{
int err = NET_RX_SUCCESS;
switch (vlan_gro_common(napi, grp, vlan_tci, skb)) {
case -1:
return netif_receive_skb(skb);
case 2:
err = NET_RX_DROP;
/* fall through */
case 1:
kfree_skb(skb);
break;
}
return err;
}
EXPORT_SYMBOL(vlan_gro_receive);
int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
unsigned int vlan_tci, struct napi_gro_fraginfo *info)
{
struct sk_buff *skb = napi_fraginfo_skb(napi, info);
int err = NET_RX_DROP;
if (!skb)
goto out;
err = NET_RX_SUCCESS;
switch (vlan_gro_common(napi, grp, vlan_tci, skb)) {
case -1:
return netif_receive_skb(skb);
case 2:
err = NET_RX_DROP;
/* fall through */
case 1:
napi_reuse_skb(napi, skb);
break;
}
out:
return err;
}
EXPORT_SYMBOL(vlan_gro_frags);