netdev - RE: [PATCH net-next] nfp: add VLAN filtering support

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Date:   Thu, 15 Jun 2017 12:50:57 +0000
From:   "Mintz, Yuval" <Yuval.Mintz@...ium.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "oss-drivers@...ronome.com" <oss-drivers@...ronome.com>,
        Pablo Cascón <pablo.cascon@...ronome.com>
Subject: RE: [PATCH net-next] nfp: add VLAN filtering support

> From: Pablo Cascón <pablo.cascon@...ronome.com>
> 
> Add general use per-vNIC mailbox area and use it for VLAN filtering support.
> Initially proto is hardcoded to 802.1q.
> 
...
> +static int
> +nfp_net_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16
> +vid) {
> +	struct nfp_net *nn = netdev_priv(netdev);
> +
> +	/* Priority tagged packets with vlan id 0 are processed by the
> +	 * NFP as untagged packets
> +	 */
> +	if (!vid)
> +		return 0;
> +
> +	nn_writew(nn, NFP_NET_CFG_VLAN_FILTER_VID, vid);
> +	nn_writew(nn, NFP_NET_CFG_VLAN_FILTER_PROTO, ETH_P_8021Q);

If it's hard-coded, don't you want to fail the request in case proto is different?