linux-hardening - Re: [Intel-wired-lan] [PATCH net-next v5 0/7] introduce DEFINE

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Message-ID: <12121654-ca48-c0b2-f914-460c018ce0d9@intel.com>
Date: Wed, 27 Sep 2023 11:53:42 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>
CC: <netdev@...r.kernel.org>, Steven Zou <steven.zou@...el.com>,
	<edumazet@...gle.com>, David Laight <David.Laight@...lab.com>,
	<intel-wired-lan@...ts.osuosl.org>, <linux-hardening@...r.kernel.org>, "Jakub
 Kicinski" <kuba@...nel.org>, <pabeni@...hat.com>, <davem@...emloft.net>,
	"Kees Cook" <keescook@...omium.org>, "Brandeburg, Jesse"
	<jesse.brandeburg@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH net-next v5 0/7] introduce DEFINE_FLEX()
 macro



On 9/19/2023 4:10 AM, Przemek Kitszel wrote:
> On 9/12/23 18:16, Kees Cook wrote:
>> On Tue, Sep 12, 2023 at 07:59:30AM -0400, Przemek Kitszel wrote:
>>> Add DEFINE_FLEX() macro, that helps on-stack allocation of structures
>>> with trailing flex array member.
>>> Expose __struct_size() macro which reads size of data allocated
>>> by DEFINE_FLEX().
>>>
>>> Accompany new macros introduction with actual usage,
>>> in the ice driver - hence targeting for netdev tree.
>>>
>>> Obvious benefits include simpler resulting code, less heap usage,
>>> less error checking. Less obvious is the fact that compiler has
>>> more room to optimize, and as a whole, even with more stuff on the 
>>> stack,
>>> we end up with overall better (smaller) report from bloat-o-meter:
>>> add/remove: 8/6 grow/shrink: 7/18 up/down: 2211/-2270 (-59)
>>> (individual results in each patch).
>>>
>>> v5: same as v4, just not RFC
>>> v4: _Static_assert() to ensure compiletime const count param
>>> v3: tidy up 1st patch
>>> v2: Kees: reusing __struct_size() instead of doubling it as a new macro
>>>
>>> Przemek Kitszel (7):
>>>    overflow: add DEFINE_FLEX() for on-stack allocs
>>>    ice: ice_sched_remove_elems: replace 1 elem array param by u32
>>>    ice: drop two params of ice_aq_move_sched_elems()
>>>    ice: make use of DEFINE_FLEX() in ice_ddp.c
>>>    ice: make use of DEFINE_FLEX() for struct ice_aqc_add_tx_qgrp
>>>    ice: make use of DEFINE_FLEX() for struct ice_aqc_dis_txq_item
>>>    ice: make use of DEFINE_FLEX() in ice_switch.c
>>
>> Looks good to me! Feel free to pick up via netdev.
>>
>> -Kees
>>
> 
> Thanks!
> 
> Patchwork [1] says it's "Awaiting Upstream", which is the same for most 
> of the "to: IWL" patches. That means it's delegated to Tony?

netdev maintainers,

As this has non-Intel changes and is marked for 'net-next', do you want 
to take this or prefer me to take via IWL and send as PR?

Thanks,
Tony

> By any means, minimizing "usage examples" to just ice driver makes it 
> easy to merge via Tony's tree.
> 
> [1] 
> https://patchwork.kernel.org/project/netdevbpf/patch/20230912115937.1645707-2-przemyslaw.kitszel@intel.com/