netdev - Re: [PATCH net-next v2 1/3] drop_monitor: Implement namespace filtering/reporting for software drops

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Date:   Wed, 23 Nov 2022 18:04:25 +0200
From:   nb <nikolay.borisov@...tuozzo.com>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
Cc:     nhorman@...driver.com, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org, kernel@...nvz.org
Subject: Re: [PATCH net-next v2 1/3] drop_monitor: Implement namespace
 filtering/reporting for software drops



On 23.11.22 г. 17:33 ч., Alexander Lobakin wrote:
> From: Nikolay Borisov <nikolay.borisov@...tuozzo.com>
> Date: Wed, 23 Nov 2022 16:28:15 +0200
> 

<snip>

>> @@ -1283,6 +1304,14 @@ static void net_dm_trunc_len_set(struct genl_info *info)
>>   	net_dm_trunc_len = nla_get_u32(info->attrs[NET_DM_ATTR_TRUNC_LEN]);
>>   }
>>   
>> +static void net_dm_ns_set(struct genl_info *info)
>> +{
>> +	if (!info->attrs[NET_DM_ATTR_NS])
>> +		return;
>> +
>> +	net_dm_ns = nla_get_u32(info->attrs[NET_DM_ATTR_NS]);
> 
> So, if I got it correctly, it can limit the scope to only one netns.
> Isn't that not flexible enough? What about a white- or black- list
> of NSes to filter or filter-out?

Can do, however my current use case is to really pin-point a single 
offending container, but yeah, you are right that a list would be more 
flexible. I would consider doing this provided there are no blockers in 
the code overall. Do you have any idea whether a black/white list would 
be better? This also begs the question whether we'll support some fixed 
amount of ns i.e an array or a list and allow an "infinite" amount of ns 
filtering ...

> 
>> +}
>> +
>>   static void net_dm_queue_len_set(struct genl_info *info)
>>   {
>>   	if (!info->attrs[NET_DM_ATTR_QUEUE_LEN])
>> @@ -1310,6 +1339,8 @@ static int net_dm_cmd_config(struct sk_buff *skb,
>>   
>>   	net_dm_queue_len_set(info);
>>   
>> +	net_dm_ns_set(info);
>> +
>>   	return 0;
>>   }
>>   
>> @@ -1589,6 +1620,7 @@ static const struct nla_policy net_dm_nl_policy[NET_DM_ATTR_MAX + 1] = {
>>   	[NET_DM_ATTR_ALERT_MODE] = { .type = NLA_U8 },
>>   	[NET_DM_ATTR_TRUNC_LEN] = { .type = NLA_U32 },
>>   	[NET_DM_ATTR_QUEUE_LEN] = { .type = NLA_U32 },
>> +	[NET_DM_ATTR_NS]	= { .type = NLA_U32 },
>>   	[NET_DM_ATTR_SW_DROPS]	= {. type = NLA_FLAG },
>>   	[NET_DM_ATTR_HW_DROPS]	= {. type = NLA_FLAG },
>>   };
>> -- 
>> 2.34.1
> 
> Thanks,
> Olek