linux-kernel - RE: [PATCH V3 net-next 1/8] net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC

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Message-ID: <F4CC6FACFEB3C54C9141D49AD221F7F93B81CCC3@FRAEML521-MBX.china.huawei.com>
Date:   Sat, 22 Jul 2017 23:39:12 +0000
From:   Salil Mehta <salil.mehta@...wei.com>
To:     Bo Yu <tsu.yubo@...il.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "Zhuangyuzeng (Yisen)" <yisen.zhuang@...wei.com>,
        huangdaode <huangdaode@...ilicon.com>,
        "lipeng (Y)" <lipeng321@...wei.com>,
        "mehta.salil.lnk@...il.com" <mehta.salil.lnk@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>
Subject: RE: [PATCH V3 net-next 1/8] net: hns3: Add support of HNS3 Ethernet
 Driver for hip08 SoC

Hi Bo Yu,

> -----Original Message-----
> From: Bo Yu [mailto:tsu.yubo@...il.com]
> Sent: Monday, June 19, 2017 1:57 AM
> To: Salil Mehta
> Cc: davem@...emloft.net; Zhuangyuzeng (Yisen); huangdaode; lipeng (Y);
> mehta.salil.lnk@...il.com; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; Linuxarm
> Subject: Re: [PATCH V3 net-next 1/8] net: hns3: Add support of HNS3
> Ethernet Driver for hip08 SoC
> 
> Hi,
> On Sat, Jun 17, 2017 at 06:24:24PM +0100, Salil Mehta wrote:
> >+	struct notifier_block notifier_block;
> >+	/* Vxlan/Geneve information */
> >+	struct hns3_udp_tunnel udp_tnl[HNS3_UDP_TNL_MAX];
> >+};
> >+
> >+/* the distance between [begin, end) in a ring buffer
> >+ * note: there is a unuse slot between the begin and the end
> >+ */
> >+static inline int ring_dist(struct hns3_enet_ring *ring, int begin,
> int end)
> >+{
> >+	return (end - begin + ring->desc_num) % ring->desc_num;
> >+}
> >+
> >+static inline int ring_space(struct hns3_enet_ring *ring)
> >+{
> >+	return ring->desc_num -
> >+		ring_dist(ring, ring->next_to_clean, ring->next_to_use) -
> 1;
> >+}
> >+
> >+static inline int is_ring_empty(struct hns3_enet_ring *ring)
> >+{
> >+	return ring->next_to_use == ring->next_to_clean;
> >+}
> >+
> >+static inline void hns3_write_reg(void __iomem *base, u32 reg, u32
> value)
> >+{
> >+	u8 __iomem *reg_addr = READ_ONCE(base);
> >+
> >+	writel(value, reg_addr + reg);
> >+}
> >+
> >+#define hns3_write_dev(a, reg, value) \
> >+	hns3_write_reg((a)->io_base, (reg), (value))
> >+
> >+#define hnae_queue_xmit(tqp, buf_num) writel_relaxed(buf_num, \
> >+		(tqp)->io_base + HNS3_RING_TX_RING_TAIL_REG)
> >+
> >+#define ring_to_dev(ring) (&(ring)->tqp->handle->pdev->dev)
> >+
> >+#define ring_to_dma_dir(ring) (HNAE3_IS_TX_RING(ring) ? \
> >+	DMA_TO_DEVICE : DMA_FROM_DEVICE)
> >+
> >+#define tx_ring_data(priv, idx) ((priv)->ring_data[idx])
> >+
> >+#define hnae_buf_size(_ring) ((_ring)->buf_size)
> >+#define hnae_page_order(_ring) (get_order(hnae_buf_size(_ring)))
> >+#define hnae_page_size(_ring) (PAGE_SIZE << hnae_page_order(_ring))
> >+
> >+/* iterator for handling rings in ring group */
> >+#define hns3_for_each_ring(pos, head) \
> >+	for (pos = (head).ring; pos != NULL; pos = pos->next)
> 
> Only a pos? Comparsion to NULL could be written "pos" noticed by
> checkpatch.
Fixed in patch V4. Thanks!

Salil
> 
> 
> >+
> >+void hns3_ethtool_set_ops(struct net_device *ndev);
> >+
> >+int hns3_nic_net_xmit_hw(
> >+				struct net_device *ndev,
> >+				struct sk_buff *skb,
> >+				struct hns3_nic_ring_data *ring_data);
> >+int hns3_clean_tx_ring(struct hns3_enet_ring *ring, int budget);
> >+int hns3_clean_rx_ring_ex(
> >+				struct hns3_enet_ring *ring,
> >+				struct sk_buff **skb_ex,
> >+				int budget);
> >+#endif
> >--
> >2.7.4
> >
> >