netdev - Re: [PATCH 1/3] rhashtable: require max

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Date:	Tue, 10 Feb 2015 15:18:16 -0600
From:	Josh Hunt <johunt@...mai.com>
To:	Patrick McHardy <kaber@...sh.net>, Thomas Graf <tgraf@...g.ch>,
	Daniel Borkmann <daniel@...earbox.net>
CC:	Pablo Neira Ayuso <pablo@...filter.org>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/3] rhashtable: require max_shift definition

On 02/10/2015 11:44 AM, Patrick McHardy wrote:
> Am 10. Februar 2015 18:22:41 MEZ, schrieb Thomas Graf <tgraf@...g.ch>:
>> On 02/10/15 at 06:06pm, Daniel Borkmann wrote:
>>> Hm, given that min_shift/max_shift are parameters that directly
>>> concern internals of rhashtable i.e. are tightly coupled to expand
>>> and shrink functionality, I'd say that depending on the use case,
>>> a maxelem limit should rather be handled outside of it, if it's
>>> truly an issue/concern.
>>
>> Agreed, Netlink already uses the atomic counter of rhashtable to
>> enforce  upper limit of table entries:
>>
>>         err = -ENOMEM;
>>         if (BITS_PER_LONG > 32 &&
>>             unlikely(atomic_read(&table->hash.nelems) >= UINT_MAX))
>>                 goto err;
>
> I would tend to agree with Pablo, now we're handling half (shift) internally and half (max) externally, using internal values.

OK. Thanks for all the feedback. I will send a v2 once the other 2 
patches get reviewed.

Thanks
Josh

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