Re: [PATCH] Gigabit Ethernet driver of Topcliff PCH

[Masayuki Ohtake]

Hi Fujita

> > This DMA of device is not standard.  Personal use of Gigabit Ethernet device.
> > So, I guess that I do not need to use DMA-API.
>
> Sorry, I'm not sure what you mean. If a driver does DMA, it must use
> the DMA API. Your driver already uses the DMA API (pci_dma_*),
> however, pci_map_* API is obsolete so please use dma_map_* API
> instead.

Thank you for the explanation.
I understood and use dma_map_* .

Thanks Ohtake
----- Original Message ----- 
From: "FUJITA Tomonori" <fujita.tomonori@xxxxxxxxxxxxx>
To: <masa-korg@xxxxxxxxxxxxxxx>
Cc: <fujita.tomonori@xxxxxxxxxxxxx>; <shemminger@xxxxxxxxxx>; <sam@xxxxxxxxxxxx>; <joe@xxxxxxxxxxx>;
<linux-kernel@xxxxxxxxxxxxxxx>; <netdev@xxxxxxxxxxxxxxx>; <gregory.v.rose@xxxxxxxxx>; <mbizon@xxxxxxxxxx>;
<kristoffer@xxxxxxxxxxx>; <ralf@xxxxxxxxxxxxxx>; <john.linn@xxxxxxxxxx>; <randy.dunlap@xxxxxxxxxx>;
<davem@xxxxxxxxxxxxx>; <meego-dev@xxxxxxxxx>; <qi.wang@xxxxxxxxx>; <yong.y.wang@xxxxxxxxx>;
<andrew.chih.howe.khor@xxxxxxxxx>; <joel.clark@xxxxxxxxx>; <margie.foster@xxxxxxxxx>; <okada533@xxxxxxxxxxxxxxx>;
<morinaga526@xxxxxxxxxxxxxxx>; <shimizu394@xxxxxxxxxxxxxxx>
Sent: Tuesday, September 07, 2010 12:21 PM
Subject: Re: [PATCH] Gigabit Ethernet driver of Topcliff PCH


> On Tue, 7 Sep 2010 10:13:22 +0900
> "Masayuki Ohtake" <masa-korg@xxxxxxxxxxxxxxx> wrote:
>
> > > Probably, this trick doesn't work because zero could be a valid DMA
> > > address on some architctures.
> > >
> >
> > The flag which shows mapped will be added.
> > And it is used instead of "if (buffer_info->dma) ".
>
> Sounds fine. That's what other drivers do.
>
>
> > > > + /*-- Set Buffer infomation --*/
> > > > + buffer_info->length = skb->len;
> > > > + buffer_info->dma =
> > > > +     pci_map_single(adapter->pdev, skb->data, buffer_info->length,
> > > > +    PCI_DMA_TODEVICE);
> > >
> > > Needs to handle mapping failure (dma_mapping_errro)?
> >
> > Error process will be added.
>
> Nice.
>
>
> > > Can you use dma_map_* API instead of pci_map_*? Please read:
> > >
> >
> > This DMA of device is not standard.  Personal use of Gigabit Ethernet device.
> > So, I guess that I do not need to use DMA-API.
>
> Sorry, I'm not sure what you mean. If a driver does DMA, it must use
> the DMA API. Your driver already uses the DMA API (pci_dma_*),
> however, pci_map_* API is obsolete so please use dma_map_* API
> instead.
>
> Thanks,
> --
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