linux-kernel - Re: [PATCH net-next 1/2] net: filter: split filter.c into two files

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Date:	Thu, 24 Jul 2014 16:58:23 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Valdis.Kletnieks@...edu
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/2] net: filter: split filter.c into two files

On Thu, Jul 24, 2014 at 4:45 PM,  <Valdis.Kletnieks@...edu> wrote:
> On Tue, 22 Jul 2014 23:01:58 -0700, Alexei Starovoitov said:
>> BPF is used in several kernel components. This split creates logical boundary
>> between generic eBPF core and the rest
>>
>> kernel/bpf/core.c: eBPF interpreter
>>
>> net/core/filter.c: classic->eBPF converter, classic verifiers, socket filters
>>
>> This patch only moves functions.
>>
>> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
>> ---
>>  kernel/Makefile     |    1 +
>>  kernel/bpf/Makefile |    1 +
>>  kernel/bpf/core.c   |  536 +++++++++++++++++++++++++++++++++++++++++++++++++
> ++
>>  net/core/filter.c   |  511 ------------------------------------------------
>>  4 files changed, 538 insertions(+), 511 deletions(-)
>>  create mode 100644 kernel/bpf/Makefile
>>  create mode 100644 kernel/bpf/core.c
>>
>> diff --git a/kernel/Makefile b/kernel/Makefile
>> index f2a8b6246ce9..e7360b7c2c0e 100644
>> --- a/kernel/Makefile
>> +++ b/kernel/Makefile
>> @@ -87,6 +87,7 @@ obj-$(CONFIG_RING_BUFFER) += trace/
>>  obj-$(CONFIG_TRACEPOINTS) += trace/
>>  obj-$(CONFIG_IRQ_WORK) += irq_work.o
>>  obj-$(CONFIG_CPU_PM) += cpu_pm.o
>> +obj-$(CONFIG_NET) += bpf/
>
> I was expecting to see CONFIG_NETFILTER here.  Is CONFIG_NET intentional?

yes. it is config_net for now, until eBPF is completely separate from net.
Then it will gain its own config_bpf, so it can be used in net-less setups
or disabled in net-full setups by folks who care about last byte of .text size.
Future will tell.
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