On Tue, May 27, 2014 at 01:44:27PM +0100, Zhangfei Gao wrote:
> Add support for the hix5hd2 XGMAC 1Gb ethernet device.
> The controller requires two queues for tx and two queues for rx.
> Controller fetch buffer from free queue and then push to used queue.
> Diver should prepare free queue and free buffer from used queue.
>
> Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
> ---
> drivers/net/ethernet/Kconfig | 1 +
> drivers/net/ethernet/Makefile | 1 +
> drivers/net/ethernet/hisilicon/Kconfig | 27 +
> drivers/net/ethernet/hisilicon/Makefile | 5 +
> drivers/net/ethernet/hisilicon/hix5hd2_gmac.c | 1057 +++++++++++++++++++++++++
> 5 files changed, 1091 insertions(+)
> create mode 100644 drivers/net/ethernet/hisilicon/Kconfig
> create mode 100644 drivers/net/ethernet/hisilicon/Makefile
> create mode 100644 drivers/net/ethernet/hisilicon/hix5hd2_gmac.c
[...]
> +struct hix5hd2_desc {
> + __le32 buff_addr;
> + __le32 cmd;
> +} __aligned(32);
[...]
> +static void hix5hd2_rx_refill(struct hix5hd2_priv *priv)
> +{
> + struct hix5hd2_desc *desc;
> + struct sk_buff *skb;
> + u32 start, end, num, pos, i;
> +
> + /* software write pointer */
> + start = dma_cnt(readl_relaxed(priv->base + RX_FQ_WR_ADDR));
> + /* logic read pointer */
> + end = dma_cnt(readl_relaxed(priv->base + RX_FQ_RD_ADDR));
> + num = CIRC_SPACE(start, end, RX_DESC_NUM);
> +
> + for (i = 0, pos = start; i < num; i++) {
> + if (priv->rx_skb[pos])
> + break;
> + else {
> + skb = netdev_alloc_skb_ip_align(priv->netdev,
> + MAC_MAX_FRAME_SIZE);
> + if (unlikely(skb == NULL))
> + break;
> + }
> +
> + desc = priv->rx_fq.desc + pos;
> + desc->buff_addr =
> + dma_map_single(priv->dev, skb->data,
> + MAC_MAX_FRAME_SIZE, DMA_FROM_DEVICE);
buff_addr was declared as an __le32, but here we're pasting values of
the kernel's native endianness (which might not be little). You will
need to carefully convert the endianness of this value when dealing with
it.
> + if (dma_mapping_error(priv->dev, desc->buff_addr)) {
> + dev_kfree_skb_any(skb);
> + break;
> + }
> +
> + priv->rx_skb[pos] = skb;
> + desc->cmd = (MAC_MAX_FRAME_SIZE - 1) | DESC_VLD_FREE;
Likewise cmd was described as an __le32 and needs to be converted
appropriately.
Cheers,
Mark.
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