static int gve_set_xdp()

in google/gve/gve_main.c [1561:1599]

• 32 lines of code
• 10 McCabe index (conditional complexity)

static int gve_set_xdp(struct gve_priv *priv, struct bpf_prog *prog,
		       struct netlink_ext_ack *extack)
{
	struct bpf_prog *old_prog;
	int err = 0;
	u32 status;

	old_prog = READ_ONCE(priv->xdp_prog);
	if (!netif_running(priv->dev)) {
		WRITE_ONCE(priv->xdp_prog, prog);
		if (old_prog)
			bpf_prog_put(old_prog);
		return 0;
	}

	gve_turndown(priv);
	if (!old_prog && prog) {
		// Allocate XDP TX queues if an XDP program is
		// being installed
		err = gve_add_xdp_queues(priv);
		if (err)
			goto out;
	} else if (old_prog && !prog) {
		// Remove XDP TX queues if an XDP program is
		// being uninstalled
		err = gve_remove_xdp_queues(priv);
		if (err)
			goto out;
	}
	WRITE_ONCE(priv->xdp_prog, prog);
	if (old_prog)
		bpf_prog_put(old_prog);

out:
	gve_turnup(priv);
	status = ioread32be(&priv->reg_bar0->device_status);
	gve_handle_link_status(priv, GVE_DEVICE_STATUS_LINK_STATUS_MASK & status);
	return err;
}