netdev - Re: [patch net-next v7 07/13] net: sched: use block index as a handle instead of qdisc when block is shared

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Date:   Thu, 11 Jan 2018 10:38:06 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, jhs@...atatu.com,
        xiyou.wangcong@...il.com, mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, jakub.kicinski@...ronome.com,
        simon.horman@...ronome.com, pieter.jansenvanvuuren@...ronome.com,
        john.hurley@...ronome.com, alexander.h.duyck@...el.com,
        ogerlitz@...lanox.com, john.fastabend@...il.com,
        daniel@...earbox.net
Subject: Re: [patch net-next v7 07/13] net: sched: use block index as a
 handle instead of qdisc when block is shared

Wed, Jan 10, 2018 at 07:12:44PM CET, dsahern@...il.com wrote:
>On 1/9/18 7:07 AM, Jiri Pirko wrote:
>> diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
>> index 843e29a..9c026d9 100644
>> --- a/include/uapi/linux/rtnetlink.h
>> +++ b/include/uapi/linux/rtnetlink.h
>> @@ -541,9 +541,15 @@ struct tcmsg {
>>  	int		tcm_ifindex;
>>  	__u32		tcm_handle;
>>  	__u32		tcm_parent;
>> +/* tcm_block_index is used instead of tcm_parent
>> + * in case tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK
>> + */
>> +#define tcm_block_index tcm_parent
>>  	__u32		tcm_info;
>>  };
>>  
>> +#define TCM_IFINDEX_MAGIC_BLOCK (0xFFFFFFFFU)
>> +
>>  enum {
>>  	TCA_UNSPEC,
>>  	TCA_KIND,
>
>
>This could be more clearly documented for anyone wanting to write an app
>against the API. Something like:
>
>For shared blocks, tcm_ifindex is set to TCM_IFINDEX_MAGIC_BLOCK, and
>tcm_parent is aliased to tcm_block_index which is the block index.

Okay, will add this comment here.