linux-kernel - Re: [External] Re: [PATCH bpf-next] netkit: Add some ethtool ops to provide information to user

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Message-ID: <16b4d42d-2d62-460e-912f-6e3b86f3004d@bytedance.com>
Date:   Thu, 30 Nov 2023 17:24:05 +0800
From:   Feng Zhou <zhoufeng.zf@...edance.com>
To:     Nikolay Aleksandrov <razor@...ckwall.org>, daniel@...earbox.net,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, yangzhenze@...edance.com,
        wangdongdong.6@...edance.com, tangchen.1@...edance.com
Subject: Re: [External] Re: [PATCH bpf-next] netkit: Add some ethtool ops to
 provide information to user

在 2023/11/30 17:06, Nikolay Aleksandrov 写道:
> On 11/30/23 09:58, Feng zhou wrote:
>> From: Feng Zhou <zhoufeng.zf@...edance.com>
>>
>> Add get_strings, get_sset_count, get_ethtool_stats to get peer
>> ifindex.
>> ethtool -S nk1
>> NIC statistics:
>>       peer_ifindex: 36
>>
>> Add get_link, get_link_ksettings to get link stat.
>> ethtool nk1
>> Settings for nk1:
>>     ...
>>     Link detected: yes
>>
>> Add get_ts_info.
>> ethtool -T nk1
>> Time stamping parameters for nk1:
>> ...
>>
>> Signed-off-by: Feng Zhou <zhoufeng.zf@...edance.com>
>> ---
>>   drivers/net/netkit.c | 53 ++++++++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 53 insertions(+)
>>
> 
> Hi,
> I don't see any point in sending peer_ifindex through ethtool, even
> worse through ethtool stats. That is definitely the wrong place for it.
> You can already retrieve that through netlink. About the speed/duplex
> this one makes more sense, but this is the wrong way to do it.
> See how we did it for virtio_net (you are free to set speed/duplex
> to anything to please bonding for example). Although I doubt anyone will 
> use netkit with bonding, so even that is questionable. :)
> 
> Nacked-by: Nikolay Aleksandrov <razor@...ckwall.org>
> 
> Cheers,
>   Nik
> 

We use netkit to replace veth to improve performance, veth can be used 
ethtool -S veth to get peer_ifindex, so this part is added, as long as 
it is to keep the netkit part and veth unified, to ensure the same usage 
habits, and to replace it without perception.