netdev - Re: [PATCH 22/28] sgiseeq: convert from dma_cache_sync to dma_sync_single_for

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Date:   Tue, 1 Sep 2020 17:22:09 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Christoph Hellwig <hch@....de>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Matt Porter <mporter@...nel.crashing.org>,
        iommu@...ts.linux-foundation.org,
        Tom Lendacky <thomas.lendacky@....com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        nouveau@...ts.freedesktop.org, netdev@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
        linux-mm@...ck.org, alsa-devel@...a-project.org
Subject: Re: [PATCH 22/28] sgiseeq: convert from dma_cache_sync to
 dma_sync_single_for_device

On Wed, Aug 19, 2020 at 08:55:49AM +0200, Christoph Hellwig wrote:
> Use the proper modern API to transfer cache ownership for incoherent DMA.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  drivers/net/ethernet/seeq/sgiseeq.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/seeq/sgiseeq.c b/drivers/net/ethernet/seeq/sgiseeq.c
> index 39599bbb5d45b6..f91dae16d69a19 100644
> --- a/drivers/net/ethernet/seeq/sgiseeq.c
> +++ b/drivers/net/ethernet/seeq/sgiseeq.c
> @@ -112,14 +112,18 @@ struct sgiseeq_private {
>  
>  static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr)
>  {
> -	dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
> -		       DMA_FROM_DEVICE);
> +	struct sgiseeq_private *sp = netdev_priv(dev);
> +
> +	dma_sync_single_for_cpu(dev->dev.parent, VIRT_TO_DMA(sp, addr),
> +			sizeof(struct sgiseeq_rx_desc), DMA_BIDIRECTIONAL);
>  }
>  
>  static inline void dma_sync_desc_dev(struct net_device *dev, void *addr)
>  {
> -	dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
> -		       DMA_TO_DEVICE);
> +	struct sgiseeq_private *sp = netdev_priv(dev);
> +
> +	dma_sync_single_for_device(dev->dev.parent, VIRT_TO_DMA(sp, addr),
> +			sizeof(struct sgiseeq_rx_desc), DMA_BIDIRECTIONAL);
>  }

this breaks ethernet on IP22 completely, but I haven't figured out why, yet.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]