net: xdp: avoid output parameters when querying XDP prog
The output parameters will get unwieldy if we want to add more
information about the program. Simply pass the entire
struct netdev_bpf in.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index 07ed21d..3f271c9 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -7073,17 +7073,21 @@ int dev_change_proto_down(struct net_device *dev, bool proto_down)
}
EXPORT_SYMBOL(dev_change_proto_down);
-u8 __dev_xdp_attached(struct net_device *dev, bpf_op_t bpf_op, u32 *prog_id)
+void __dev_xdp_query(struct net_device *dev, bpf_op_t bpf_op,
+ struct netdev_bpf *xdp)
+{
+ memset(xdp, 0, sizeof(*xdp));
+ xdp->command = XDP_QUERY_PROG;
+
+ /* Query must always succeed. */
+ WARN_ON(bpf_op(dev, xdp) < 0);
+}
+
+static u8 __dev_xdp_attached(struct net_device *dev, bpf_op_t bpf_op)
{
struct netdev_bpf xdp;
- memset(&xdp, 0, sizeof(xdp));
- xdp.command = XDP_QUERY_PROG;
-
- /* Query must always succeed. */
- WARN_ON(bpf_op(dev, &xdp) < 0);
- if (prog_id)
- *prog_id = xdp.prog_id;
+ __dev_xdp_query(dev, bpf_op, &xdp);
return xdp.prog_attached;
}
@@ -7134,10 +7138,10 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
bpf_chk = generic_xdp_install;
if (fd >= 0) {
- if (bpf_chk && __dev_xdp_attached(dev, bpf_chk, NULL))
+ if (bpf_chk && __dev_xdp_attached(dev, bpf_chk))
return -EEXIST;
if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) &&
- __dev_xdp_attached(dev, bpf_op, NULL))
+ __dev_xdp_attached(dev, bpf_op))
return -EBUSY;
prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP,