AuxXxilium/linux_dsm_epyc7002
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xdp: add reporting of offload mode

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Extend the XDP_ATTACHED_* values to include offloaded mode.
Let drivers report whether program is installed in the driver
or the HW by changing the prog_attached field from bool to
u8 (type of the netlink attribute).

Exploit the fact that the value of XDP_ATTACHED_DRV is 1,
therefore since all drivers currently assign the mode with
double negation:
       mode = !!xdp_prog;
no drivers have to be modified.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-06-21 18:25:09 -07:00 committed by David S. Miller
parent cafa92ac25
commit ce158e580a
4 changed files with 9 additions and 8 deletions
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7
include/linux/netdevice.h
View File

@ -809,7 +809,8 @@ enum xdp_netdev_command {
XDP_SETUP_PROG,
XDP_SETUP_PROG_HW,
/* Check if a bpf program is set on the device. The callee should
* return true if a program is currently attached and running.
* set @prog_attached to one of XDP_ATTACHED_* values, note that "true"
* is equivalent to XDP_ATTACHED_DRV.
*/
XDP_QUERY_PROG,
};
@ -827,7 +828,7 @@ struct netdev_xdp {
};
/* XDP_QUERY_PROG */
struct {
bool prog_attached;
u8 prog_attached;
u32 prog_id;
};
};
@ -3307,7 +3308,7 @@ struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
typedef int (*xdp_op_t)(struct net_device *dev, struct netdev_xdp *xdp);
int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
int fd, u32 flags);
bool __dev_xdp_attached(struct net_device *dev, xdp_op_t xdp_op, u32 *prog_id);
u8 __dev_xdp_attached(struct net_device *dev, xdp_op_t xdp_op, u32 *prog_id);
int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);

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

@ -903,6 +903,7 @@ enum {
XDP_ATTACHED_NONE = 0,
XDP_ATTACHED_DRV,
XDP_ATTACHED_SKB,
XDP_ATTACHED_HW,
};
enum {

3
net/core/dev.c
View File

@ -6934,8 +6934,7 @@ int dev_change_proto_down(struct net_device *dev, bool proto_down)
}
EXPORT_SYMBOL(dev_change_proto_down);
bool __dev_xdp_attached(struct net_device *dev, xdp_op_t xdp_op,
u32 *prog_id)
u8 __dev_xdp_attached(struct net_device *dev, xdp_op_t xdp_op, u32 *prog_id)
{
struct netdev_xdp xdp;

6
net/core/rtnetlink.c
View File

@ -1265,10 +1265,10 @@ static u8 rtnl_xdp_attached_mode(struct net_device *dev, u32 *prog_id)
*prog_id = generic_xdp_prog->aux->id;
return XDP_ATTACHED_SKB;
}
if (ops->ndo_xdp && __dev_xdp_attached(dev, ops->ndo_xdp, prog_id))
return XDP_ATTACHED_DRV;
if (!ops->ndo_xdp)
return XDP_ATTACHED_NONE;
return XDP_ATTACHED_NONE;
return __dev_xdp_attached(dev, ops->ndo_xdp, prog_id);
}
static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)