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net: add ndo to setup/query xdp prog in adapter rx

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Add one new netdev op for drivers implementing the BPF_PROG_TYPE_XDP
filter. The single op is used for both setup/query of the xdp program,
modelled after ndo_setup_tc.

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Brenden Blanco 2016-07-19 12:16:48 -07:00 • committed by David S. Miller
parent 6a773a15a1
commit a7862b4584
2 changed files with 67 additions and 0 deletions
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33
net/core/dev.c
View file

@ -94,6 +94,7 @@
#include <linux/ethtool.h>
#include <linux/notifier.h>
#include <linux/skbuff.h>
#include <linux/bpf.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/busy_poll.h>
@ -6614,6 +6615,38 @@ int dev_change_proto_down(struct net_device *dev, bool proto_down)
}
EXPORT_SYMBOL(dev_change_proto_down);
/**
* dev_change_xdp_fd - set or clear a bpf program for a device rx path
* @dev: device
* @fd: new program fd or negative value to clear
*
* Set or clear a bpf program for a device
*/
int dev_change_xdp_fd(struct net_device *dev, int fd)
{
const struct net_device_ops *ops = dev->netdev_ops;
struct bpf_prog *prog = NULL;
struct netdev_xdp xdp = {};
int err;
if (!ops->ndo_xdp)
return -EOPNOTSUPP;
if (fd >= 0) {
prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_XDP);
if (IS_ERR(prog))
return PTR_ERR(prog);
}
xdp.command = XDP_SETUP_PROG;
xdp.prog = prog;
err = ops->ndo_xdp(dev, &xdp);
if (err < 0 && prog)
bpf_prog_put(prog);
return err;
}
EXPORT_SYMBOL(dev_change_xdp_fd);
/**
* dev_new_index - allocate an ifindex
* @net: the applicable net namespace