netdev - Re: [PATCH net-next] net: filter: move load

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Date:	Thu, 3 Jul 2014 07:53:39 -0700
From:	Z Lim <zlim.lnx@...il.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: filter: move load_pointer() into filter.h

On Thu, Jul 3, 2014 at 1:10 AM, Daniel Borkmann <dborkman@...hat.com> wrote:
> Hi Zi,
>
>
> On 07/03/2014 09:52 AM, Zi Shen Lim wrote:
>>
>> load_pointer() is already a static inline function.
>> Let's move it into filter.h so BPF JIT implementations can reuse this
>> function.
>>
>> Signed-off-by: Zi Shen Lim <zlim.lnx@...il.com>
>> ---
>> This patch is based on discussion with Alexei in the context of
>> reusing load_pointer for upcoming arm64 BPF JIT compiler. [1]
>>
>> Compile tested on x86_64 and arm64.
>>
>> [1] https://lkml.org/lkml/2014/7/3/14
>>
>>   include/linux/filter.h | 13 +++++++++++++
>>   net/core/filter.c      |  9 ---------
>>   2 files changed, 13 insertions(+), 9 deletions(-)
>>
>> diff --git a/include/linux/filter.h b/include/linux/filter.h
>> index a7e3c48..2288e31 100644
>> --- a/include/linux/filter.h
>> +++ b/include/linux/filter.h
>> @@ -6,6 +6,7 @@
>>
>>   #include <linux/atomic.h>
>>   #include <linux/compat.h>
>> +#include <linux/skbuff.h>
>>   #include <linux/workqueue.h>
>>   #include <uapi/linux/filter.h>
>>
>> @@ -406,6 +407,18 @@ static inline u16 bpf_anc_helper(const struct
>> sock_filter *ftest)
>>         }
>>   }
>>
>> +void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
>> +                                          int k, unsigned int size);
>> +
>> +static inline void *load_pointer(const struct sk_buff *skb, int k,
>> +                                unsigned int size, void *buffer)
>> +{
>
>
> Fine by me, but since you're exporting this into a header,
> please give this a more specific name, such as bpf_load_pointer(),
> for example.

Daniel, thanks for the suggestion. I'll send out v2 shortly.

>
> Thanks,
>
> Daniel
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