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

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Date:	Sun, 13 Oct 2013 16:31:21 +0200
From:	Vladimir Murzin <murzin.v@...il.com>
To:	malc <av1474@...tv.ru>
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, Oct 13, 2013 at 06:25:34PM +0400, malc wrote:
> 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)
Oops... Thanks for quick response!

I'd better send the patch as a separate message.

> 
> > +					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 */
> > 
> 
> -- 
> mailto:av1474@...tv.ru
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