netdev - Re: [PATCH] net: moxa: inherit DMA masks to make dma_map

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Message-ID: <YvaCE0lqfOi+tE5X@lunn.ch>
Date:   Fri, 12 Aug 2022 18:38:43 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Sergei Antonov <saproj@...il.com>
Cc:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        Pavel Skripkin <paskripkin@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Guobin Huang <huangguobin4@...wei.com>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH] net: moxa: inherit DMA masks to make dma_map_single()
 work

On Fri, Aug 12, 2022 at 07:35:43PM +0300, Sergei Antonov wrote:
> On Fri, 12 Aug 2022 at 19:13, Andrew Lunn <andrew@...n.ch> wrote:
> > > +     /* Inherit the DMA masks from the platform device */
> > > +     ndev->dev.dma_mask = p_dev->dma_mask;
> > > +     ndev->dev.coherent_dma_mask = p_dev->coherent_dma_mask;
> >
> > There is only one other ethernet driver which does this. What you see
> > much more often is:
> >
> > alacritech/slicoss.c:   paddr = dma_map_single(&sdev->pdev->dev, skb->data, maplen,
> > neterion/s2io.c:                                dma_map_single(&sp->pdev->dev, ba->ba_1,
> > dlink/dl2k.c:                       cpu_to_le64(dma_map_single(&np->pdev->dev, skb->data,
> > micrel/ksz884x.c:               dma_buf->dma = dma_map_single(&hw_priv->pdev->dev, skb->data,
> 
> Also works. Do you recommend to create a v2 of the patch?

Yes please. It makes things easier to maintain if every driver does
the same thing.

    Andrew