netdev - Re: [PATCH 2/2] powerpc: bpf: Fix the broken LD_VLAN_TAG

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Date:	Tue, 24 Jun 2014 18:52:49 +0400
From:	Denis Kirjanov <kda@...ux-powerpc.org>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/2] powerpc: bpf: Fix the broken LD_VLAN_TAG_PRESENT test

On 6/24/14, Sergei Shtylyov <sergei.shtylyov@...entembedded.com> wrote:
> Hello.
>
> On 06/24/2014 01:59 PM, Denis Kirjanov wrote:
>
>> We have to return the boolean here if the tag presents
>> or not, not jusr ORing the TCI with the mask which results to:
>
>> [  709.412097] test_bpf: #18 LD_VLAN_TAG_PRESENT
>> [  709.412245] ret 4096 != 1
>> [  709.412332] ret 4096 != 1
>> [  709.412333] FAIL (2 times)
>
>     You need to sign off on the patch, else it won't be applied.

Oh, right. Moreover I've made a mistake in the description (we're ANDing)

Thanks!

>> ---
>>   arch/powerpc/net/bpf_jit_comp.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>
>> diff --git a/arch/powerpc/net/bpf_jit_comp.c
>> b/arch/powerpc/net/bpf_jit_comp.c
>> index af0ed4d..a3d8f58 100644
>> --- a/arch/powerpc/net/bpf_jit_comp.c
>> +++ b/arch/powerpc/net/bpf_jit_comp.c
>> @@ -394,8 +394,10 @@ static int bpf_jit_build_body(struct sk_filter *fp,
>> u32 *image,
>>   							  vlan_tci));
>>   			if (code == (BPF_ANC | SKF_AD_VLAN_TAG))
>>   				PPC_ANDI(r_A, r_A, ~VLAN_TAG_PRESENT);
>> -			else
>> +			else {
>
>     All arms of the *if* statement should have {} if one branch has {}.
>
>>   				PPC_ANDI(r_A, r_A, VLAN_TAG_PRESENT);
>> +				PPC_SRWI(r_A, r_A, 12);
>> +			}
>>   			break;
>>   		case BPF_ANC | SKF_AD_QUEUE:
>>   			BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff,
>
> WBR, Sergei
>
>
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