netdev - Re: [patch net-next v8 08/14] net: sched: add rt netlink message type for block get

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Message-ID: <630fad8f-f72b-d857-bd09-fa9e361659f3@gmail.com>
Date:   Mon, 15 Jan 2018 10:08:39 -0700
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
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 v8 08/14] net: sched: add rt netlink message type
 for block get

On 1/15/18 10:03 AM, Jiri Pirko wrote:
> Mon, Jan 15, 2018 at 05:56:31PM CET, dsahern@...il.com wrote:
>> On 1/12/18 8:46 AM, Jiri Pirko wrote:
>>> From: Jiri Pirko <jiri@...lanox.com>
>>>
>>> Add simple block get operation which primary purpose is to check the
>>> block existence by block index.
>>>
>>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>>> ---
>>> v6->v7:
>>> - new patch
>>> ---
>>>  include/uapi/linux/rtnetlink.h |  6 ++++
>>>  net/sched/cls_api.c            | 64 ++++++++++++++++++++++++++++++++++++++++++
>>>  security/selinux/nlmsgtab.c    |  5 +++-
>>>  3 files changed, 74 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
>>> index da878f2..4b1f626 100644
>>> --- a/include/uapi/linux/rtnetlink.h
>>> +++ b/include/uapi/linux/rtnetlink.h
>>> @@ -150,6 +150,12 @@ enum {
>>>  	RTM_NEWCACHEREPORT = 96,
>>>  #define RTM_NEWCACHEREPORT RTM_NEWCACHEREPORT
>>>  
>>> +	RTM_NEWBLOCK = 100,
>>> +#define RTM_NEWBLOCK RTM_NEWBLOCK
>>> +	RTM_DELBLOCK,
>>> +#define RTM_DELBLOCK RTM_DELBLOCK
>>> +	RTM_GETBLOCK,
>>> +#define RTM_GETBLOCK RTM_GETBLOCK
>>>  	__RTM_MAX,
>>>  #define RTM_MAX		(((__RTM_MAX + 3) & ~3) - 1)
>>>  };
>>> diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
>>> index d687e58..14e4f20 100644
>>> --- a/net/sched/cls_api.c
>>> +++ b/net/sched/cls_api.c
>>> @@ -1553,6 +1553,69 @@ int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
>>>  }
>>>  EXPORT_SYMBOL(tc_setup_cb_call);
>>>  
>>> +static int block_notify_fill(struct net *net, struct sk_buff *skb,
>>> +			     struct tcf_block *block, u32 portid, u32 seq,
>>> +			     u16 flags, int event)
>>> +{
>>> +	struct nlmsghdr *nlh;
>>> +	struct tcmsg *tcm;
>>> +
>>> +	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
>>> +	if (!nlh)
>>> +		return -EMSGSIZE;
>>> +	tcm = nlmsg_data(nlh);
>>> +	memset(tcm, 0, sizeof(*tcm));
>>> +	tcm->tcm_family = AF_UNSPEC;
>>> +	tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
>>> +	tcm->tcm_block_index = block->index;
>>> +	return 0;
>>> +}
>>
>> Why can't this be done with RTM_GETQDISC?
> 
> I don't follow. Could you please describe a bit more what do you think?

Why are you adding RTM_{NEW,GET,DEL}BLOCK? Can't you get the same
information using RTM_GETQDISC and updating it to check for the
'tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK' path