netdev - RE: [RFC PATCH v2 1/2] net: af_packet support for direct ring access in user space

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Message-ID: <DFDF335405C17848924A094BC35766CF0AA36561@SHSMSX104.ccr.corp.intel.com>
Date:	Wed, 14 Jan 2015 15:28:50 +0000
From:	"Zhou, Danny" <danny.zhou@...el.com>
To:	David Miller <davem@...emloft.net>,
	"David.Laight@...LAB.COM" <David.Laight@...LAB.COM>
CC:	"john.fastabend@...il.com" <john.fastabend@...il.com>,
	"dborkman@...hat.com" <dborkman@...hat.com>,
	"hannes@...essinduktion.org" <hannes@...essinduktion.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"nhorman@...driver.com" <nhorman@...driver.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"brouer@...hat.com" <brouer@...hat.com>
Subject: RE: [RFC PATCH v2 1/2] net: af_packet support for direct ring
 access in user space



> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: Wednesday, January 14, 2015 1:28 AM
> To: David.Laight@...LAB.COM
> Cc: john.fastabend@...il.com; dborkman@...hat.com; hannes@...essinduktion.org; netdev@...r.kernel.org; Zhou, Danny;
> nhorman@...driver.com; Ronciak, John; brouer@...hat.com
> Subject: Re: [RFC PATCH v2 1/2] net: af_packet support for direct ring access in user space
> 
> From: David Laight <David.Laight@...LAB.COM>
> Date: Tue, 13 Jan 2015 17:15:30 +0000
> 
> > How about something like:
> >
> > struct tpacket_dma_mem_region {
> >     __u64 addr;        /* userspace virtual address */
> >     __u64 phys_addr;    /* physical address */
> >     __u64 iova;        /* IO virtual address used for DMA */
> >     __u64 size;    /* size of region */
> >     int direction;        /* dma data direction */
> > } aligned(8);
> >
> > So that it is independant of 32/64 bits.
> > It is a shame that gcc has no way of defining a 64bit 'void *' on 32bit systems.
> > You can use a union, but you still need to zero extend the value on LE (worse on BE).
> 
> We have an __aligned_u64, please use that.

Thanks, will do.
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