netdev - Re: [PATCH 2/3] net: bpf jit: x86: optimize choose_load

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Message-ID: <alpine.LNX.2.00.1310131824180.2262@linmac>
Date:	Sun, 13 Oct 2013 18:25:34 +0400 (MSK)
From:	malc <av1474@...tv.ru>
To:	Vladimir Murzin <murzin.v@...il.com>
cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	kaffeemonster@...glemail.com, edumazet@...gle.com,
	mingo@...hat.com, tglx@...utronix.de
Subject: Re: [PATCH 2/3] net: bpf jit: x86: optimize choose_load_func error
 path

On Sun, 13 Oct 2013, Vladimir Murzin wrote:

> On Fri, Oct 11, 2013 at 02:56:13PM -0400, David Miller wrote:
> > From: Vladimir Murzin <murzin.v@...il.com>
> > Date: Tue,  8 Oct 2013 20:31:49 +0400
> > 

[..snip..]

> -common_load:			seen |= SEEN_DATAREF;
> +common_load:
> +				if (!func) {
> +					CLEAR_A();
> +					EIT_JMP(cleanup_addr - addrs[i]);

                                        EMIT? (likewise elsewhere)

> +					break;
> +				}
> +
> +				seen |= SEEN_DATAREF;
>  				t_offset = func - (image + addrs[i]);
>  				EMIT1_off32(0xbe, K); /* mov imm32,%esi */
>  				EMIT1_off32(0xe8, t_offset); /* call */
> @@ -624,6 +631,13 @@ common_load:			seen |= SEEN_DATAREF;
>  				goto common_load;
>  			case BPF_S_LDX_B_MSH:
>  				func = CHOOSE_LOAD_FUNC(K, sk_load_byte_msh);
> +
> +				if (!func) {
> +					CLEAR_A();
> +					EIT_JMP(cleanup_addr - addrs[i]);
> +					break;
> +				}
> +
>  				seen |= SEEN_DATAREF | SEEN_XREG;
>  				t_offset = func - (image + addrs[i]);
>  				EMIT1_off32(0xbe, K);	/* mov imm32,%esi */
> 

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