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net: Add IFLA_XDP_PROG_ID

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Expose prog_id through IFLA_XDP_PROG_ID.  This patch
makes modification to generic_xdp.  The later patches will
modify other xdp-supported drivers.

prog_id is added to struct net_dev_xdp.

iproute2 patch will be followed. Here is how the 'ip link'
will look like:
> ip link show eth0
3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 xdp(prog_id:1) qdisc fq_codel state UP mode DEFAULT group default qlen 1000

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau 2017-06-15 17:29:09 -07:00 committed by David S. Miller
parent 3dc02251f4
commit 58038695e6
4 changed files with 38 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/netdevice.h
View File

@ -824,7 +824,10 @@ struct netdev_xdp {
struct netlink_ext_ack *extack;
};
/* XDP_QUERY_PROG */
bool prog_attached;
struct {
bool prog_attached;
u32 prog_id;
};
};
};
@ -3302,7 +3305,7 @@ 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);
bool __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

@ -907,6 +907,7 @@ enum {
IFLA_XDP_FD,
IFLA_XDP_ATTACHED,
IFLA_XDP_FLAGS,
IFLA_XDP_PROG_ID,
__IFLA_XDP_MAX,
};

19
net/core/dev.c
View File

@ -4342,13 +4342,12 @@ static struct static_key generic_xdp_needed __read_mostly;
static int generic_xdp_install(struct net_device *dev, struct netdev_xdp *xdp)
{
struct bpf_prog *old = rtnl_dereference(dev->xdp_prog);
struct bpf_prog *new = xdp->prog;
int ret = 0;
switch (xdp->command) {
case XDP_SETUP_PROG: {
struct bpf_prog *old = rtnl_dereference(dev->xdp_prog);
case XDP_SETUP_PROG:
rcu_assign_pointer(dev->xdp_prog, new);
if (old)
bpf_prog_put(old);
@ -4360,10 +4359,10 @@ static int generic_xdp_install(struct net_device *dev, struct netdev_xdp *xdp)
dev_disable_lro(dev);
}
break;
}
case XDP_QUERY_PROG:
xdp->prog_attached = !!rcu_access_pointer(dev->xdp_prog);
xdp->prog_attached = !!old;
xdp->prog_id = old ? old->aux->id : 0;
break;
default:
@ -6937,7 +6936,8 @@ 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)
bool __dev_xdp_attached(struct net_device *dev, xdp_op_t xdp_op,
u32 *prog_id)
{
struct netdev_xdp xdp;
@ -6946,6 +6946,9 @@ bool __dev_xdp_attached(struct net_device *dev, xdp_op_t xdp_op)
/* Query must always succeed. */
WARN_ON(xdp_op(dev, &xdp) < 0);
if (prog_id)
*prog_id = xdp.prog_id;
return xdp.prog_attached;
}
@ -6991,10 +6994,10 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
xdp_chk = generic_xdp_install;
if (fd >= 0) {
if (xdp_chk && __dev_xdp_attached(dev, xdp_chk))
if (xdp_chk && __dev_xdp_attached(dev, xdp_chk, NULL))
return -EEXIST;
if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) &&
__dev_xdp_attached(dev, xdp_op))
__dev_xdp_attached(dev, xdp_op, NULL))
return -EBUSY;
prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_XDP);

27
net/core/rtnetlink.c
View File

@ -39,6 +39,7 @@
#include <linux/if_vlan.h>
#include <linux/pci.h>
#include <linux/etherdevice.h>
#include <linux/bpf.h>
#include <linux/uaccess.h>
@ -899,7 +900,8 @@ static size_t rtnl_port_size(const struct net_device *dev,
static size_t rtnl_xdp_size(void)
{
size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */
nla_total_size(1); /* XDP_ATTACHED */
nla_total_size(1) + /* XDP_ATTACHED */
nla_total_size(4); /* XDP_PROG_ID */
return xdp_size;
}
@ -1248,15 +1250,20 @@ static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
return 0;
}
static u8 rtnl_xdp_attached_mode(struct net_device *dev)
static u8 rtnl_xdp_attached_mode(struct net_device *dev, u32 *prog_id)
{
const struct net_device_ops *ops = dev->netdev_ops;
const struct bpf_prog *generic_xdp_prog;
ASSERT_RTNL();
if (rcu_access_pointer(dev->xdp_prog))
*prog_id = 0;
generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
if (generic_xdp_prog) {
*prog_id = generic_xdp_prog->aux->id;
return XDP_ATTACHED_SKB;
if (ops->ndo_xdp && __dev_xdp_attached(dev, ops->ndo_xdp))
}
if (ops->ndo_xdp && __dev_xdp_attached(dev, ops->ndo_xdp, prog_id))
return XDP_ATTACHED_DRV;
return XDP_ATTACHED_NONE;
@ -1265,6 +1272,7 @@ static u8 rtnl_xdp_attached_mode(struct net_device *dev)
static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
{
struct nlattr *xdp;
u32 prog_id;
int err;
xdp = nla_nest_start(skb, IFLA_XDP);
@ -1272,10 +1280,16 @@ static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
return -EMSGSIZE;
err = nla_put_u8(skb, IFLA_XDP_ATTACHED,
rtnl_xdp_attached_mode(dev));
rtnl_xdp_attached_mode(dev, &prog_id));
if (err)
goto err_cancel;
if (prog_id) {
err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
if (err)
goto err_cancel;
}
nla_nest_end(skb, xdp);
return 0;
@ -1553,6 +1567,7 @@ static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
[IFLA_XDP_FD] = { .type = NLA_S32 },
[IFLA_XDP_ATTACHED] = { .type = NLA_U8 },
[IFLA_XDP_FLAGS] = { .type = NLA_U32 },
[IFLA_XDP_PROG_ID] = { .type = NLA_U32 },
};
static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
@ -2225,7 +2240,7 @@ static int do_setlink(const struct sk_buff *skb,
if (err < 0)
goto errout;
if (xdp[IFLA_XDP_ATTACHED]) {
if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
err = -EINVAL;
goto errout;
}