Commit e4a2a304 authored by Jason Wang's avatar Jason Wang Committed by David S. Miller
Browse files

net: sock: introduce SOCK_XDP



This patch introduces a new sock flag - SOCK_XDP. This will be used
for notifying the upper layer that XDP program is attached on the
lower socket, and requires for extra headroom.

TUN will be the first user.
Signed-off-by: default avatarJason Wang <jasowang@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9708d2b5
......@@ -869,6 +869,9 @@ static int tun_attach(struct tun_struct *tun, struct file *file,
tun_napi_init(tun, tfile, napi);
}
if (rtnl_dereference(tun->xdp_prog))
sock_set_flag(&tfile->sk, SOCK_XDP);
tun_set_real_num_queues(tun);
/* device is allowed to go away first, so no need to hold extra
......@@ -1241,13 +1244,29 @@ static int tun_xdp_set(struct net_device *dev, struct bpf_prog *prog,
struct netlink_ext_ack *extack)
{
struct tun_struct *tun = netdev_priv(dev);
struct tun_file *tfile;
struct bpf_prog *old_prog;
int i;
old_prog = rtnl_dereference(tun->xdp_prog);
rcu_assign_pointer(tun->xdp_prog, prog);
if (old_prog)
bpf_prog_put(old_prog);
for (i = 0; i < tun->numqueues; i++) {
tfile = rtnl_dereference(tun->tfiles[i]);
if (prog)
sock_set_flag(&tfile->sk, SOCK_XDP);
else
sock_reset_flag(&tfile->sk, SOCK_XDP);
}
list_for_each_entry(tfile, &tun->disabled, next) {
if (prog)
sock_set_flag(&tfile->sk, SOCK_XDP);
else
sock_reset_flag(&tfile->sk, SOCK_XDP);
}
return 0;
}
......
......@@ -800,6 +800,7 @@ enum sock_flags {
SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */
SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */
SOCK_TXTIME,
SOCK_XDP, /* XDP is attached */
};
#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
......
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment