netdev - Re: [PATCH v2 net-next 05/15] net: ethernet: mtk_eth_soc: rely on txd_size in mtk_tx_alloc/mtk_tx

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Message-ID: <20220517183522.4a585885@kernel.org>
Date:   Tue, 17 May 2022 18:35:22 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, nbd@....name, john@...ozen.org,
        sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
        davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        Sam.Shih@...iatek.com, linux-mediatek@...ts.infradead.org,
        devicetree@...r.kernel.org, robh@...nel.org,
        lorenzo.bianconi@...hat.com
Subject: Re: [PATCH v2 net-next 05/15] net: ethernet: mtk_eth_soc: rely on
 txd_size in mtk_tx_alloc/mtk_tx_clean

On Mon, 16 May 2022 18:06:32 +0200 Lorenzo Bianconi wrote:
>  static int mtk_tx_alloc(struct mtk_eth *eth)
>  {
> +	const struct mtk_soc_data *soc = eth->soc;
>  	struct mtk_tx_ring *ring = &eth->tx_ring;
> -	int i, sz = sizeof(*ring->dma);

The change would be smaller if you left sz in place. 
I guess you have a reason not to?

> +	struct mtk_tx_dma *txd;
> +	int i;
>  
>  	ring->buf = kcalloc(MTK_DMA_SIZE, sizeof(*ring->buf),
>  			       GFP_KERNEL);
>  	if (!ring->buf)
>  		goto no_tx_mem;
>  
> -	ring->dma = dma_alloc_coherent(eth->dma_dev, MTK_DMA_SIZE * sz,
> +	ring->dma = dma_alloc_coherent(eth->dma_dev,
> +				       MTK_DMA_SIZE * soc->txrx.txd_size,
>  				       &ring->phys, GFP_ATOMIC);

Another GFP nugget.