netdev - Re: [PATCH net-next v2] net: bridge: add STP xstats

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Message-ID: <498b31ea-bafc-1f44-d4bd-354f30a71972@cumulusnetworks.com>
Date:   Wed, 11 Dec 2019 11:40:31 +0200
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Vivien Didelot <vivien.didelot@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH net-next v2] net: bridge: add STP xstats

On 11/12/2019 04:02, Vivien Didelot wrote:
> Hi Nikolay,
> 
> On Tue, 10 Dec 2019 23:45:13 +0200, Nikolay Aleksandrov <nikolay@...ulusnetworks.com> wrote:
>>> +	if (p) {
>>> +		nla = nla_reserve_64bit(skb, BRIDGE_XSTATS_STP,
>>> +					sizeof(p->stp_xstats),
>>> +					BRIDGE_XSTATS_PAD);
>>> +		if (!nla)
>>> +			goto nla_put_failure;
>>> +
>>> +		memcpy(nla_data(nla), &p->stp_xstats, sizeof(p->stp_xstats));
>>
>> You need to take the STP lock here to get a proper snapshot of the values.
> 
> Good catch! I see a br->multicast_lock but no br->stp_lock. Is this what
> you expect?
> 
>     spin_lock_bh(&br->lock);
>     memcpy(nla_data(nla), &p->stp_xstats, sizeof(p->stp_xstats));
>     spin_unlock_bh(&br->lock);
> 

Yeah, this is a very old lock (pre-git) which needs some attention. :)
That is the lock and the above looks good to me.

> 
> Thanks,
> 
> 	Vivien
> 

Cheers,
 Nik