netdev - Re: [PATCH net-next v2] ravb: Remove rx buffer ALIGN

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Date:	Wed, 4 May 2016 14:13:56 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Yoshihiro Kaneko <ykaneko0929@...il.com>, netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH net-next v2] ravb: Remove rx buffer ALIGN

Hello.

On 5/1/2016 6:19 PM, Yoshihiro Kaneko wrote:

> From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
>
> Aligning the reception data size is not required.
>
> Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
> Signed-off-by: Yoshihiro Kaneko <ykaneko0929@...il.com>
> Tested-by: Simon Horman <horms+renesas@...ge.net.au>

Acked-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

> ---
>
> This patch is based on the master branch of David Miller's next networking
> tree.
>
> v2 [Yoshihiro Kaneko]
> * As suggested by Sergei Shtylyov
>   remove re-formattings which is not related to the subject of this patch.
>
>  drivers/net/ethernet/renesas/ravb_main.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 238b56f..34066e0 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -246,10 +246,9 @@ static void ravb_ring_format(struct net_device *ndev, int q)
>  	for (i = 0; i < priv->num_rx_ring[q]; i++) {
>  		/* RX descriptor */
>  		rx_desc = &priv->rx_ring[q][i];
> -		/* The size of the buffer should be on 16-byte boundary. */
> -		rx_desc->ds_cc = cpu_to_le16(ALIGN(PKT_BUF_SZ, 16));
> +		rx_desc->ds_cc = cpu_to_le16(PKT_BUF_SZ);
>  		dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
> -					  ALIGN(PKT_BUF_SZ, 16),
> +					  PKT_BUF_SZ,
>  					  DMA_FROM_DEVICE);

    I'd expect you to make 2 above lines a single line. Oh well...

>  		/* We just set the data size to 0 for a failed mapping which
>  		 * should prevent DMA from happening...
> @@ -558,7 +557,7 @@ static bool ravb_rx(struct net_device *ndev, int *quota, int q)
>  			skb = priv->rx_skb[q][entry];
>  			priv->rx_skb[q][entry] = NULL;
>  			dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
> -					 ALIGN(PKT_BUF_SZ, 16),
> +					 PKT_BUF_SZ,

    Likewise.

>  					 DMA_FROM_DEVICE);
>  			get_ts &= (q == RAVB_NC) ?
>  					RAVB_RXTSTAMP_TYPE_V2_L2_EVENT :
[...]

MBR, Sergei