linux-kernel - RE: [PATCH v3 5/6] dpaa_eth: fix iova handling for contiguous frames

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Message-ID: <VI1PR04MB5134156396FB7597FD2A0DE5EC190@VI1PR04MB5134.eurprd04.prod.outlook.com>
Date:   Fri, 31 May 2019 17:01:32 +0000
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     Christoph Hellwig <hch@...radead.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Madalin-cristian Bucur <madalin.bucur@....com>,
        Roy Pledge <roy.pledge@....com>,
        Camelia Alexandra Groza <camelia.groza@....com>,
        Leo Li <leoyang.li@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jocke@...inera.com" <joakim.tjernlund@...inera.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v3 5/6] dpaa_eth: fix iova handling for contiguous frames

> -----Original Message-----
> From: Christoph Hellwig <hch@...radead.org>
> Sent: Friday, May 31, 2019 7:56 PM
> 
> On Fri, May 31, 2019 at 04:53:16PM +0000, Laurentiu Tudor wrote:
> > Unfortunately due to our hardware particularities we do not have
> alternatives. This is also the case for our next generation of ethernet
> drivers [1]. I'll let my colleagues that work on the ethernet drivers to
> comment more on this.
> 
> Then you need to enhance the DMA API to support your use case instead
> of using an API only supported for two specific IOMMU implementations.
> 
> Remember in Linux you can should improve core code and not hack around
> it in crappy ways making lots of assumptions in your drivers.

Alright, I'm ok with that. I'll try to come up with something, will keep you in the loop.

---
Best Regards, Laurentiu