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Date: Mon, 26 May 2014 16:51:15 +0200 From: Arnd Bergmann <arnd@...db.de> To: Zhangfei Gao <zhangfei.gao@...aro.org> Cc: davem@...emloft.net, f.fainelli@...il.com, sergei.shtylyov@...entembedded.com, mark.rutland@....com, David.Laight@...lab.com, eric.dumazet@...il.com, haifeng.yan@...aro.org, jchxue@...il.com, linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org, devicetree@...r.kernel.org Subject: Re: [PATCH 3/3] net: hisilicon: add hix5hd2 mac driver On Monday 19 May 2014, Zhangfei Gao wrote: I only noticed one real issue with the driver: > +struct hix5hd2_desc { > + __le32 buff_addr; > + __le32 buff_len:11; > + __le32 reserve2:5; > + __le32 data_len:11; > + __le32 reserve1:2; > + __le32 fl:2; > + __le32 descvid:1; > +} __aligned(32); > + You should generall not use bitfields in hardware data structures, as that is not endian safe and will prevent running a big-endian kernel on this machine. Better convert this to a set of __le32 fields and explicit shifts and masks. Two smaller things you should think about, I'm not entirely sure about these: > +static int hix5hd2_rx(struct net_device *dev, int limit) > +{ > + struct hix5hd2_priv *priv = netdev_priv(dev); > + struct sk_buff *skb; > + struct hix5hd2_desc *desc; > + dma_addr_t dma_addr; > + u32 start, end, num, pos, i, len; > + > + /* software read pointer */ > + start = dma_cnt(readl_relaxed(priv->base + RX_BQ_RD_ADDR)); > + /* logic write pointer */ > + end = dma_cnt(readl_relaxed(priv->base + RX_BQ_WR_ADDR)); I think one of these needs to be readl() instead of readl_relaxed(), to ensure the data is correctly ordered with regard to the pointer access. > + if (pos != start) > + writel(dma_byte(pos), priv->base + TX_RQ_RD_ADDR); While this looks like it could be writel_relaxed(). Arnd -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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