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Date: Mon, 24 Mar 2014 09:32:17 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Zhangfei Gao <zhangfei.gao@...aro.org>
Cc: David Miller <davem@...emloft.net>,
Russell King <linux@....linux.org.uk>,
Arnd Bergmann <arnd@...db.de>,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
Mark Rutland <mark.rutland@....com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
netdev <netdev@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 3/3] net: hisilicon: new hip04 ethernet driver
2014-03-24 7:14 GMT-07:00 Zhangfei Gao <zhangfei.gao@...aro.org>:
> Support Hisilicon hip04 ethernet driver, including 100M / 1000M controller
>
> Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>
> ---
> drivers/net/ethernet/hisilicon/Makefile | 2 +-
> drivers/net/ethernet/hisilicon/hip04_eth.c | 728 ++++++++++++++++++++++++++++
> 2 files changed, 729 insertions(+), 1 deletion(-)
> create mode 100644 drivers/net/ethernet/hisilicon/hip04_eth.c
[snip]
> +static void hip04_config_port(struct hip04_priv *priv, u32 speed, u32 duplex)
> +{
> + u32 val;
> +
> + priv->speed = speed;
> + priv->duplex = duplex;
> +
> + switch (priv->phy_mode) {
> + case PHY_INTERFACE_MODE_SGMII:
> + if (speed == SPEED_1000)
> + val = 8;
> + else
> + val = 7;
> + break;
> + case PHY_INTERFACE_MODE_MII:
> + val = 1; /* SPEED_100 */
> + break;
> + default:
> + val = 0;
> + break;
Is 0 valid for e.g: 10Mbits/sec, regardless of the phy_mode?
[snip]
> +
> +static void hip04_mac_enable(struct net_device *ndev, bool enable)
> +{
> + struct hip04_priv *priv = netdev_priv(ndev);
> + u32 val;
> +
> + if (enable) {
> + /* enable tx & rx */
> + val = readl_relaxed(priv->base + GE_PORT_EN);
> + val |= BIT(1); /* rx*/
> + val |= BIT(2); /* tx*/
> + writel_relaxed(val, priv->base + GE_PORT_EN);
> +
> + /* enable interrupt */
> + priv->reg_inten = DEF_INT_MASK;
> + writel_relaxed(priv->reg_inten, priv->base + PPE_INTEN);
> +
> + /* clear rx int */
> + val = RCV_INT;
> + writel_relaxed(val, priv->base + PPE_RINT);
Should not you first clear the interrupt and then DEF_INT_MASK? Why is
there a RCV_INT applied to PPE_RINT register in the enable path, but
there is no such thing in the "disable" branch of your function?
> +
> + /* config recv int*/
> + val = BIT(6); /* int threshold 1 package */
> + val |= 0x4; /* recv timeout */
> + writel_relaxed(val, priv->base + PPE_CFG_RX_PKT_INT);
> + } else {
> + /* disable int */
> + priv->reg_inten &= ~(RCV_INT | RCV_NOBUF);
> + writel_relaxed(priv->reg_inten, priv->base + PPE_INTEN);
> +
> + /* disable tx & rx */
> + val = readl_relaxed(priv->base + GE_PORT_EN);
> + val &= ~(BIT(1)); /* rx*/
> + val &= ~(BIT(2)); /* tx*/
> + writel_relaxed(val, priv->base + GE_PORT_EN);
> + }
There is little to no sharing between the two branches, I would have
created separate helper functions for the enable/disable logic.
> +}
> +
> +static void hip04_set_xmit_desc(struct hip04_priv *priv, dma_addr_t phys)
> +{
> + writel(phys, priv->base + PPE_CFG_TX_PKT_BD_ADDR);
This is not 64-bits/LPAE safe, do you have a High address part and a
Low address part for your address in the buffer descriptor address, if
so, better use it now.
[snip]
> +
> +static int hip04_rx_poll(struct napi_struct *napi, int budget)
> +{
> + struct hip04_priv *priv = container_of(napi, struct hip04_priv, napi);
> + struct net_device *ndev = priv->ndev;
> + struct net_device_stats *stats = &ndev->stats;
> + unsigned int cnt = hip04_recv_cnt(priv);
> + struct sk_buff *skb;
> + struct rx_desc *desc;
> + unsigned char *buf;
> + dma_addr_t phys;
> + int rx = 0;
> + u16 len;
> + u32 err;
> +
> + while (cnt) {
> + buf = priv->rx_buf[priv->rx_head];
> + skb = build_skb(buf, priv->rx_buf_size);
> + if (unlikely(!skb))
> + net_dbg_ratelimited("build_skb failed\n");
> +
> + dma_unmap_single(&ndev->dev, priv->rx_phys[priv->rx_head],
> + RX_BUF_SIZE, DMA_FROM_DEVICE);
> + priv->rx_phys[priv->rx_head] = 0;
> +
> + desc = (struct rx_desc *)skb->data;
> + len = be16_to_cpu(desc->pkt_len);
> + err = be32_to_cpu(desc->pkt_err);
> +
> + if (len > RX_BUF_SIZE)
> + len = RX_BUF_SIZE;
> + if (0 == len)
> + break;
Should not this be a continue? This is an error packet, so you should
keep on processing the others, or does this have a special meaning?
> +
> + if (err & RX_PKT_ERR) {
> + dev_kfree_skb_any(skb);
> + stats->rx_dropped++;
> + stats->rx_errors++;
> + continue;
> + }
> +
> + stats->rx_packets++;
> + stats->rx_bytes += len;
> +
> + skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
> + skb_put(skb, len);
> + skb->protocol = eth_type_trans(skb, ndev);
> + napi_gro_receive(&priv->napi, skb);
> +
> + buf = netdev_alloc_frag(priv->rx_buf_size);
> + if (!buf)
> + return -ENOMEM;
> + phys = dma_map_single(&ndev->dev, buf,
> + RX_BUF_SIZE, DMA_FROM_DEVICE);
Missing dma_mapping_error() check here.
> + priv->rx_buf[priv->rx_head] = buf;
> + priv->rx_phys[priv->rx_head] = phys;
> + hip04_set_recv_desc(priv, phys);
> +
> + priv->rx_head = RX_NEXT(priv->rx_head);
> + if (rx++ >= budget)
> + break;
> +
> + if (--cnt == 0)
> + cnt = hip04_recv_cnt(priv);
> + }
> +
> + if (rx < budget) {
> + napi_complete(napi);
> +
> + /* enable rx interrupt */
> + priv->reg_inten |= RCV_INT | RCV_NOBUF;
> + writel_relaxed(priv->reg_inten, priv->base + PPE_INTEN);
> + }
> +
> + return rx;
> +}
> +
> +static irqreturn_t hip04_mac_interrupt(int irq, void *dev_id)
> +{
> + struct net_device *ndev = (struct net_device *) dev_id;
> + struct hip04_priv *priv = netdev_priv(ndev);
> + u32 ists = readl_relaxed(priv->base + PPE_INTSTS);
> + u32 val = DEF_INT_MASK;
> +
> + writel_relaxed(val, priv->base + PPE_RINT);
> +
> + if (ists & (RCV_INT | RCV_NOBUF)) {
> + if (napi_schedule_prep(&priv->napi)) {
> + /* disable rx interrupt */
> + priv->reg_inten &= ~(RCV_INT | RCV_NOBUF);
> + writel_relaxed(priv->reg_inten, priv->base + PPE_INTEN);
> + __napi_schedule(&priv->napi);
> + }
> + }
You should also process TX completion interrupts here
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void hip04_tx_reclaim(struct net_device *ndev, bool force)
> +{
> + struct hip04_priv *priv = netdev_priv(ndev);
> + unsigned tx_head = priv->tx_head;
> + unsigned tx_tail = priv->tx_tail;
> + struct tx_desc *desc = &priv->tx_desc[priv->tx_tail];
> +
> + while (tx_tail != tx_head) {
> + if (desc->send_addr != 0) {
> + if (force)
> + desc->send_addr = 0;
> + else
> + break;
> + }
> + if (priv->tx_phys[tx_tail]) {
> + dma_unmap_single(&ndev->dev, priv->tx_phys[tx_tail],
> + priv->tx_skb[tx_tail]->len, DMA_TO_DEVICE);
> + priv->tx_phys[tx_tail] = 0;
> + }
> + dev_kfree_skb_irq(priv->tx_skb[tx_tail]);
dev_kfree_skb_irq() bypasses all sort of SKB tracking, you might want
to use kfree_skb() here instead.
> + priv->tx_skb[tx_tail] = NULL;
> + tx_tail = TX_NEXT(tx_tail);
> + priv->tx_count--;
> + }
> + priv->tx_tail = tx_tail;
> +}
> +
> +static int hip04_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
> +{
> + struct hip04_priv *priv = netdev_priv(ndev);
> + struct net_device_stats *stats = &ndev->stats;
> + unsigned int tx_head = priv->tx_head;
> + struct tx_desc *desc = &priv->tx_desc[tx_head];
> + dma_addr_t phys;
> +
> + hip04_tx_reclaim(ndev, false);
> +
> + if (priv->tx_count++ >= TX_DESC_NUM) {
> + net_dbg_ratelimited("no TX space for packet\n");
> + netif_stop_queue(ndev);
> + return NETDEV_TX_BUSY;
> + }
> +
> + phys = dma_map_single(&ndev->dev, skb->data, skb->len, DMA_TO_DEVICE);
Missing dma_mapping_error() check here
> + priv->tx_skb[tx_head] = skb;
> + priv->tx_phys[tx_head] = phys;
> + desc->send_addr = cpu_to_be32(phys);
> + desc->send_size = cpu_to_be16(skb->len);
> + desc->cfg = cpu_to_be32(DESC_DEF_CFG);
> + phys = priv->tx_desc_dma + tx_head * sizeof(struct tx_desc);
> + desc->wb_addr = cpu_to_be32(phys);
Don't we need a barrier here to ensure that all stores are completed
before we hand this descriptor address to hip40_set_xmit_desc() which
should make DMA start processing it?
> + skb_tx_timestamp(skb);
> + hip04_set_xmit_desc(priv, phys);
> + priv->tx_head = TX_NEXT(tx_head);
> +
> + stats->tx_bytes += skb->len;
> + stats->tx_packets++;
You cannot update the transmit stats here, what start_xmit() does it
just queue packets for the DMA engine to process them, but that does
not mean DMA has completed those. You should update statistics in the
tx_reclaim() function.
--
Florian
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