netdev - Re: [PATCH 3/3, net-next] net: netsec: add XDP support

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Date:   Fri, 28 Jun 2019 15:35:52 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc:     netdev@...r.kernel.org, jaswinder.singh@...aro.org,
        ard.biesheuvel@...aro.org, bjorn.topel@...el.com,
        magnus.karlsson@...el.com, daniel@...earbox.net, ast@...nel.org,
        makita.toshiaki@....ntt.co.jp, jakub.kicinski@...ronome.com,
        john.fastabend@...il.com, davem@...emloft.net,
        maciejromanfijalkowski@...il.com, brouer@...hat.com
Subject: Re: [PATCH 3/3, net-next] net: netsec: add XDP support

On Fri, 28 Jun 2019 13:39:15 +0300
Ilias Apalodimas <ilias.apalodimas@...aro.org> wrote:

> +static int netsec_xdp_setup(struct netsec_priv *priv, struct bpf_prog *prog,
> +			    struct netlink_ext_ack *extack)
> +{
> +	struct net_device *dev = priv->ndev;
> +	struct bpf_prog *old_prog;
> +
> +	/* For now just support only the usual MTU sized frames */
> +	if (prog && dev->mtu > 1500) {
> +		NL_SET_ERR_MSG_MOD(extack, "Jumbo frames not supported on XDP");
> +		return -EOPNOTSUPP;
> +	}
> +
> +	if (netif_running(dev))
> +		netsec_netdev_stop(dev);
> +
> +	/* Detach old prog, if any */
> +	old_prog = xchg(&priv->xdp_prog, prog);
> +	if (old_prog)
> +		bpf_prog_put(old_prog);
> +
> +	if (netif_running(dev))
> +		netsec_netdev_open(dev);

Shouldn't the if-statement be if (!netif_running(dev))

> +
> +	return 0;
> +}



-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer