netdev - Re: [PATCH RFC v4 bpf-next 07/11] tun: set egress XDP program

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Date:   Mon, 9 Mar 2020 20:18:16 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jason Wang <jasowang@...hat.com>, David Ahern <dsahern@...nel.org>,
        netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org,
        prashantbhole.linux@...il.com, brouer@...hat.com, toke@...hat.com,
        mst@...hat.com, toshiaki.makita1@...il.com, daniel@...earbox.net,
        john.fastabend@...il.com, ast@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, andriin@...com,
        David Ahern <dahern@...italocean.com>
Subject: Re: [PATCH RFC v4 bpf-next 07/11] tun: set egress XDP program

On 3/1/20 8:32 PM, Jason Wang wrote:
>> @@ -1189,15 +1190,21 @@ tun_net_get_stats64(struct net_device *dev,
>> struct rtnl_link_stats64 *stats)
>>   }
>>     static int tun_xdp_set(struct net_device *dev, struct bpf_prog *prog,
>> -               struct netlink_ext_ack *extack)
> 
> 
> How about accept a bpf_prog ** here, then there's no need to check
> egress when deferencing the pointer?
> 
> 

The egress arg is better. xdp_prog vs xdp_egress_prog is an element of
'struct tun'. tun is currently not needed in tun_xdp and is part of
tun_xdp_set already.