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xfrm: add new packet offload flag 

In the next patches, the xfrm core code will be extended to support
new type of offload - packet offload. In that mode, both policy and state
should be specially configured in order to perform whole offloaded data
path.

Full offload takes care of encryption, decryption, encapsulation and
other operations with headers.

As this mode is new for XFRM policy flow, we can "start fresh" with flag
bits and release first and second bit for future use.

Reviewed-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Leon Romanovsky 2022-12-02 20:41:27 +02:00 committed by Steffen Klassert
parent 65e6af6ceb
commit d14f28b8c1
4 changed files with 18 additions and 0 deletions
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7
include/net/xfrm.h
View File

@ -131,12 +131,19 @@ enum {
XFRM_DEV_OFFLOAD_OUT,
};
enum {
XFRM_DEV_OFFLOAD_UNSPECIFIED,
XFRM_DEV_OFFLOAD_CRYPTO,
XFRM_DEV_OFFLOAD_PACKET,
};
struct xfrm_dev_offload {
struct net_device *dev;
netdevice_tracker dev_tracker;
struct net_device *real_dev;
unsigned long offload_handle;
u8 dir : 2;
u8 type : 2;
};
struct xfrm_mode {

6
include/uapi/linux/xfrm.h
View File

@ -519,6 +519,12 @@ struct xfrm_user_offload {
*/
#define XFRM_OFFLOAD_IPV6 1
#define XFRM_OFFLOAD_INBOUND 2
/* Two bits above are relevant for state path only, while
* offload is used for both policy and state flows.
*
* In policy offload mode, they are free and can be safely reused.
*/
#define XFRM_OFFLOAD_PACKET 4
struct xfrm_userpolicy_default {
#define XFRM_USERPOLICY_UNSPEC 0

3
net/xfrm/xfrm_device.c
View File

@ -291,12 +291,15 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
else
xso->dir = XFRM_DEV_OFFLOAD_OUT;
xso->type = XFRM_DEV_OFFLOAD_CRYPTO;
err = dev->xfrmdev_ops->xdo_dev_state_add(x);
if (err) {
xso->dev = NULL;
xso->dir = 0;
xso->real_dev = NULL;
netdev_put(dev, &xso->dev_tracker);
xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
if (err != -EOPNOTSUPP) {
NL_SET_ERR_MSG(extack, "Device failed to offload this state");

2
net/xfrm/xfrm_user.c
View File

@ -956,6 +956,8 @@ static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb)
xuo->ifindex = xso->dev->ifindex;
if (xso->dir == XFRM_DEV_OFFLOAD_IN)
xuo->flags = XFRM_OFFLOAD_INBOUND;
if (xso->type == XFRM_DEV_OFFLOAD_PACKET)
xuo->flags |= XFRM_OFFLOAD_PACKET;
return 0;
}