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SubjectRe: [PATCH net-next 2/3] net: ethernet: socionext: add AVE ethernet driver
Hi Florian,
Thank you for your comments,

On Fri, 8 Sep 2017 12:31:18 -0700 <f.fainelli@gmail.com> wrote:

> On 09/08/2017 06:02 AM, Kunihiko Hayashi wrote:
> > The UniPhier platform from Socionext provides the AVE ethernet
> > controller that includes MAC and MDIO bus supporting RGMII/RMII
> > modes. The controller is named AVE.
> >
> > Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
> > Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
> > ---

..snip..

> > +static inline u32 ave_r32(struct net_device *ndev, u32 offset)
> > +{
> > + void __iomem *addr = (void __iomem *)ndev->base_addr;
> > +
> > + return readl_relaxed(addr + offset);
> > +}
>
> Don't do this, ndev->base_addr is convenient, but is now deprecated
> (unlike ISA cards, you can't change this anymore) instead, just pass a
> reference to an ave_private structure and store the base register
> pointer there.

Oh, I didn't notice that ndev->base_addr was deprecated.
I'll rewrite it using an ave_private structure.

> > +
> > +static inline void ave_w32(struct net_device *ndev, u32 offset, u32 value)
> > +{
> > + void __iomem *addr = (void __iomem *)ndev->base_addr;
> > +
> > + writel_relaxed(value, addr + offset);
> > +}
>
> Same here.

Ditto.

> > +
> > +static inline u32 ave_rdesc(struct net_device *ndev, enum desc_id id,
> > + int entry, int offset)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > + u32 addr = (id == AVE_DESCID_TX) ? priv->tx.daddr : priv->rx.daddr;
> > +
> > + addr += entry * priv->desc_size + offset;
> > +
> > + return ave_r32(ndev, addr);
> > +}
> > +
> > +static inline void ave_wdesc(struct net_device *ndev, enum desc_id id,
> > + int entry, int offset, u32 val)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > + u32 addr = (id == AVE_DESCID_TX) ? priv->tx.daddr : priv->rx.daddr;
> > +
> > + addr += entry * priv->desc_size + offset;
> > +
> > + ave_w32(ndev, addr, val);
> > +}
> > +
> > +static void ave_wdesc_addr(struct net_device *ndev, enum desc_id id,
> > + int entry, int offset, dma_addr_t paddr)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > +
> > + ave_wdesc(ndev, id, entry, offset, (u32)((u64)paddr & 0xFFFFFFFFULL));
>
> lower_32_bits()

It's convenient.

> > + if (IS_DESC_64BIT(priv))
> > + ave_wdesc(ndev, id,
> > + entry, offset + 4, (u32)((u64)paddr >> 32));
>
> upper_32_bits()

Ditto.

> > + else if ((u64)paddr > (u64)U32_MAX)
> > + netdev_warn(ndev, "DMA address exceeds the address space\n");
> > +}
> > +
> > +static void ave_get_fwversion(struct net_device *ndev, char *buf, int len)
> > +{
> > + u32 major, minor;
> > +
> > + major = (ave_r32(ndev, AVE_VR) & GENMASK(15, 8)) >> 8;
> > + minor = (ave_r32(ndev, AVE_VR) & GENMASK(7, 0));
> > + snprintf(buf, len, "v%u.%u", major, minor);
> > +}
> > +
> > +static void ave_get_drvinfo(struct net_device *ndev,
> > + struct ethtool_drvinfo *info)
> > +{
> > + struct device *dev = ndev->dev.parent;
> > +
> > + strlcpy(info->driver, dev->driver->name, sizeof(info->driver));
> > + strlcpy(info->bus_info, dev_name(dev), sizeof(info->bus_info));
>
> bus_info would likely be platform, since this is a memory mapped
> peripheral, right?

Yes, this is a memory mapped peripheral.
Now ethtool says "bus-info: 65000000.ethernet" in our case.
Is it reasonable for bus-info? or is null desirable?

> > + ave_get_fwversion(ndev, info->fw_version, sizeof(info->fw_version));
> > +}
> > +
> > +static int ave_nway_reset(struct net_device *ndev)
> > +{
> > + return genphy_restart_aneg(ndev->phydev);
> > +}
>
> You can just set your ethtool_ops::nway_reset to be
> phy_ethtool_nway_reset() which does additional checks.

I see. I'll use it.

> > +
> > +static u32 ave_get_link(struct net_device *ndev)
> > +{
> > + int err;
> > +
> > + err = genphy_update_link(ndev->phydev);
> > + if (err)
> > + return ethtool_op_get_link(ndev);
>
> No, calling genphy_update_link() is bogus see:
>
> e69e46261063a25c3907bed16a2e9d18b115d1fd ("net: dsa: Do not clobber PHY
> link outside of state machine")

You mean that phylib can't guarantee link-state when the driver calls
genphy_update_link() here, that is outside of phy_state_machine().

> > +
> > + return ndev->phydev->link;
>
> This can just be ethtool_op_get_link()

Okay, I'll replace it.

> > +}
> > +
> > +static u32 ave_get_msglevel(struct net_device *ndev)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > +
> > + return priv->msg_enable;
> > +}
> > +
> > +static void ave_set_msglevel(struct net_device *ndev, u32 val)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > +
> > + priv->msg_enable = val;
> > +}
> > +
> > +static void ave_get_wol(struct net_device *ndev,
> > + struct ethtool_wolinfo *wol)
> > +{
> > + wol->supported = 0;
> > + wol->wolopts = 0;
> > + phy_ethtool_get_wol(ndev->phydev, wol);
>
> This can be called before you successfully connected to a PHY so you
> need to check that ndev->phydev is not NULL at the very least.

I see. I'll add check code for ndev->phydev.

> > +}
> > +
> > +static int ave_set_wol(struct net_device *ndev,
> > + struct ethtool_wolinfo *wol)
> > +{
> > + if (wol->wolopts & (WAKE_ARP | WAKE_MAGICSECURE))
> > + return -EOPNOTSUPP;
> > +
> > + return phy_ethtool_set_wol(ndev->phydev, wol);
>
> Same here.

Ditto.

> > +
> > +static int ave_mdio_busywait(struct net_device *ndev)
> > +{
> > + int ret = 1, loop = 100;
> > + u32 mdiosr;
> > +
> > + /* wait until completion */
> > + while (1) {
>
> Since you are already bound by the number of times you allow this look,
> just make that a clear condition for the while() loop to exit.

Indeed. I can replace while condition.

> > + mdiosr = ave_r32(ndev, AVE_MDIOSR);
> > + if (!(mdiosr & AVE_MDIOSR_STS))
> > + break;
> > +
> > + usleep_range(10, 20);
> > + if (!loop--) {
> > + netdev_err(ndev,
> > + "failed to read from MDIO (status:0x%08x)\n",
> > + mdiosr);
> > + ret = 0;
> > + break;
> > + }
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int ave_mdiobus_read(struct mii_bus *bus, int phyid, int regnum)
> > +{
> > + struct net_device *ndev = bus->priv;
> > + u32 mdioctl;
> > +
> > + /* write address */
> > + ave_w32(ndev, AVE_MDIOAR, (phyid << 8) | regnum);
> > +
> > + /* read request */
> > + mdioctl = ave_r32(ndev, AVE_MDIOCTR);
> > + ave_w32(ndev, AVE_MDIOCTR, mdioctl | AVE_MDIOCTR_RREQ);
> > +
> > + if (!ave_mdio_busywait(ndev)) {
> > + netdev_err(ndev, "phy-%d reg-%x read failed\n",
> > + phyid, regnum);
> > + return 0xffff;
> > + }
> > +
> > + return ave_r32(ndev, AVE_MDIORDR) & GENMASK(15, 0);
> > +}
> > +
> > +static int ave_mdiobus_write(struct mii_bus *bus,
> > + int phyid, int regnum, u16 val)
> > +{
> > + struct net_device *ndev = bus->priv;
> > + u32 mdioctl;
> > +
> > + /* write address */
> > + ave_w32(ndev, AVE_MDIOAR, (phyid << 8) | regnum);
> > +
> > + /* write data */
> > + ave_w32(ndev, AVE_MDIOWDR, val);
> > +
> > + /* write request */
> > + mdioctl = ave_r32(ndev, AVE_MDIOCTR);
> > + ave_w32(ndev, AVE_MDIOCTR, mdioctl | AVE_MDIOCTR_WREQ);
> > +
> > + if (!ave_mdio_busywait(ndev)) {
> > + netdev_err(ndev, "phy-%d reg-%x write failed\n",
> > + phyid, regnum);
> > + return -1;
> > + }
>
> Just propagate the return value of ave_mdio_busywait().

Yes, I'll reconsider the way to handle return value.

> > +
> > + return 0;
> > +}
> > +
> > +static dma_addr_t ave_dma_map(struct net_device *ndev, struct ave_desc *desc,
> > + void *ptr, size_t len,
> > + enum dma_data_direction dir)
> > +{
> > + dma_addr_t paddr;
> > +
> > + paddr = dma_map_single(ndev->dev.parent, ptr, len, dir);
> > + if (dma_mapping_error(ndev->dev.parent, paddr)) {
> > + desc->skbs_dma = 0;
> > + paddr = (dma_addr_t)virt_to_phys(ptr);
>
> Why do you do that? If dma_map_single() failed, that's it, game over,
> you need to discad the packet, not assume that it is in the kernel's
> linear mapping!

I see. It's not necessary to worry about failing dma_map_single().
I'll rewrite it to discard the packet.

> > + } else {
> > + desc->skbs_dma = paddr;
> > + desc->skbs_dmalen = len;
> > + }
> > +
> > + return paddr;
> > +}
> > +
> > +static void ave_dma_unmap(struct net_device *ndev, struct ave_desc *desc,
> > + enum dma_data_direction dir)
> > +{
> > + if (!desc->skbs_dma)
> > + return;
> > +
> > + dma_unmap_single(ndev->dev.parent,
> > + desc->skbs_dma, desc->skbs_dmalen, dir);
> > + desc->skbs_dma = 0;
> > +}
> > +
> > +/* Set Rx descriptor and memory */
> > +static int ave_set_rxdesc(struct net_device *ndev, int entry)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > + struct sk_buff *skb;
> > + unsigned long align;
> > + dma_addr_t paddr;
> > + void *buffptr;
> > + int ret = 0;
> > +
> > + skb = priv->rx.desc[entry].skbs;
> > + if (!skb) {
> > + skb = netdev_alloc_skb_ip_align(ndev,
> > + AVE_MAX_ETHFRAME + NET_SKB_PAD);
> > + if (!skb) {
> > + netdev_err(ndev, "can't allocate skb for Rx\n");
> > + return -ENOMEM;
> > + }
> > + }
> > +
> > + /* set disable to cmdsts */
> > + ave_wdesc(ndev, AVE_DESCID_RX, entry, 0, AVE_STS_INTR | AVE_STS_OWN);
> > +
> > + /* align skb data for cache size */
> > + align = (unsigned long)skb_tail_pointer(skb) & (NET_SKB_PAD - 1);
> > + align = NET_SKB_PAD - align;
> > + skb_reserve(skb, align);
> > + buffptr = (void *)skb_tail_pointer(skb);
>
> Are you positive you need this? Because by default, the networking stack
> will align to the maximum between your L1 cache line size and 64 bytes,
> which should be a pretty good alignment guarantee.

Now if L1 cache line size is 128,
the skb buffer is also aligned to 128, isn't it?
So this code doesn't make sense.

> > +
> > + paddr = ave_dma_map(ndev, &priv->rx.desc[entry], buffptr,
> > + AVE_MAX_ETHFRAME + NET_IP_ALIGN, DMA_FROM_DEVICE);
>
> This needs to be checked, as mentioned before, you can't just assume the
> linear virtual map is going to be satisfactory.

I see.

> > + priv->rx.desc[entry].skbs = skb;
> > +
> > + /* set buffer pointer */
> > + ave_wdesc_addr(ndev, AVE_DESCID_RX, entry, 4, paddr);
>
> OK, so 4 is an offset, can you add a define for that so it's clear it is
> not an address size instead?

Yes, 4 is an offset. I'll add the definition for '4'.

> > +
> > + /* set enable to cmdsts */
> > + ave_wdesc(ndev, AVE_DESCID_RX,
> > + entry, 0, AVE_STS_INTR | AVE_MAX_ETHFRAME);
> > +
> > + return ret;
> > +}
> > +
> > +/* Switch state of descriptor */
> > +static int ave_desc_switch(struct net_device *ndev, enum desc_state state)
> > +{
> > + int counter;
> > + u32 val;
> > +
> > + switch (state) {
> > + case AVE_DESC_START:
> > + ave_w32(ndev, AVE_DESCC, AVE_DESCC_TD | AVE_DESCC_RD0);
> > + break;
> > +
> > + case AVE_DESC_STOP:
> > + ave_w32(ndev, AVE_DESCC, 0);
> > + counter = 0;
> > + while (1) {
> > + usleep_range(100, 150);
> > + if (!ave_r32(ndev, AVE_DESCC))
> > + break;
> > +
> > + counter++;
> > + if (counter > 100) {
> > + netdev_err(ndev, "can't stop descriptor\n");
> > + return -EBUSY;
> > + }
> > + }
>
> Same here, pleas rewrite the loop so the exit condition is clear.

Ditto.

> > + break;
> > +
> > + case AVE_DESC_RX_SUSPEND:
> > + val = ave_r32(ndev, AVE_DESCC);
> > + val |= AVE_DESCC_RDSTP;
> > + val &= AVE_DESCC_CTRL_MASK;
>
> Should not this be a &= ~AVE_DESCC_CTRL_MASK? OK maybe not.

This may be confusing. I'll fix it.

> > + ave_w32(ndev, AVE_DESCC, val);
> > +
> > + counter = 0;
> > + while (1) {
> > + usleep_range(100, 150);
> > + val = ave_r32(ndev, AVE_DESCC);
> > + if (val & (AVE_DESCC_RDSTP << 16))
> > + break;
> > +
> > + counter++;
> > + if (counter > 1000) {
> > + netdev_err(ndev, "can't suspend descriptor\n");
> > + return -EBUSY;
> > + }
> > + }
> > + break;
>
> Same here, please rewrite with the counter as an exit condition.

Ditto.

> > +
> > + case AVE_DESC_RX_PERMIT:
> > + val = ave_r32(ndev, AVE_DESCC);
> > + val &= ~AVE_DESCC_RDSTP;
> > + val &= AVE_DESCC_CTRL_MASK;
> > + ave_w32(ndev, AVE_DESCC, val);
> > + break;
> > +
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int ave_tx_completion(struct net_device *ndev)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > + u32 proc_idx, done_idx, ndesc, val;
> > + int freebuf_flag = 0;
> > +
> > + proc_idx = priv->tx.proc_idx;
> > + done_idx = priv->tx.done_idx;
> > + ndesc = priv->tx.ndesc;
> > +
> > + /* free pre stored skb from done to proc */
> > + while (proc_idx != done_idx) {
> > + /* get cmdsts */
> > + val = ave_rdesc(ndev, AVE_DESCID_TX, done_idx, 0);
> > +
> > + /* do nothing if owner is HW */
> > + if (val & AVE_STS_OWN)
> > + break;
> > +
> > + /* check Tx status and updates statistics */
> > + if (val & AVE_STS_OK) {
> > + priv->stats.tx_bytes += val & AVE_STS_PKTLEN_TX;
>
> AVE_STS_PKTLEN_TX should be suffixed with _MASK to make it clear this is
> a bitmask.

I see. I'll rename it.

> > +
> > + /* success */
> > + if (val & AVE_STS_LAST)
> > + priv->stats.tx_packets++;
> > + } else {
> > + /* error */
> > + if (val & AVE_STS_LAST) {
> > + priv->stats.tx_errors++;
> > + if (val & (AVE_STS_OWC | AVE_STS_EC))
> > + priv->stats.collisions++;
> > + }
> > + }
> > +
> > + /* release skb */
> > + if (priv->tx.desc[done_idx].skbs) {
> > + ave_dma_unmap(ndev, &priv->tx.desc[done_idx],
> > + DMA_TO_DEVICE);
> > + dev_consume_skb_any(priv->tx.desc[done_idx].skbs);
>
> Kudos for using dev_consume_skb_any()!

Thank you! I was worried about whether I could use it.

> > + priv->tx.desc[done_idx].skbs = NULL;
> > + freebuf_flag++;
> > + }
> > + done_idx = (done_idx + 1) % ndesc;
> > + }
> > +
> > + priv->tx.done_idx = done_idx;
> > +
> > + /* wake queue for freeing buffer */
> > + if (netif_queue_stopped(ndev))
> > + if (freebuf_flag)
> > + netif_wake_queue(ndev);
>
> This can be simplified to:
>
> if (netif_queue_stopped(ndev) && freebuf_flag)
> netif_wake_queue(ndev)
>
> because checking for netif_running() is implicit by actually getting
> called here, this would not happen if the network interface was not
> operational.

Oh, it can be simple. I understand the reason.

> > +static irqreturn_t ave_interrupt(int irq, void *netdev)
> > +{
> > + struct net_device *ndev = (struct net_device *)netdev;
> > + struct ave_private *priv = netdev_priv(ndev);
> > + u32 gimr_val, gisr_val;
> > +
> > + gimr_val = ave_irq_disable_all(ndev);
> > +
> > + /* get interrupt status */
> > + gisr_val = ave_r32(ndev, AVE_GISR);
> > +
> > + /* PHY */
> > + if (gisr_val & AVE_GI_PHY) {
> > + ave_w32(ndev, AVE_GISR, AVE_GI_PHY);
> > + if (priv->internal_phy_interrupt)
> > + phy_mac_interrupt(ndev->phydev, ndev->phydev->link);
>
> This is not correct you should be telling the PHY the new link state. If
> you cannot, because what happens here is really that the PHY interrupt
> is routed to your MAC controller, then what I would suggest doing is the
> following: create an interrupt controller domain which allows the PHY
> driver to manage the interrupt line using normal request_irq().

You're right. The interrupt from PHY is routed to the MAC controller.
Hmm...I think that I want to use normal PHY sequence including request_irq,
so I'll try to consider about applying the interrupt controller domain.

> > +static int ave_poll_tx(struct napi_struct *napi, int budget)
> > +{
> > + struct ave_private *priv;
> > + struct net_device *ndev;
> > + int num;
> > +
> > + priv = container_of(napi, struct ave_private, napi_tx);
> > + ndev = priv->ndev;
> > +
> > + num = ave_tx_completion(ndev);
> > + if (num < budget) {
>
> TX reclamation should not be bound against the budget, always process
> all packets that have been successfully submitted.

It's helpful for me.
I'll reconsider it to submit all packets.

> > + napi_complete(napi);
> > +
> > + /* enable Tx interrupt when NAPI finishes */
> > + ave_irq_enable(ndev, AVE_GI_TX);
> > + }
> > +
> > + return num;
> > +}
> > +
>
> > +static void ave_adjust_link(struct net_device *ndev)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > + struct phy_device *phydev = ndev->phydev;
> > + u32 val, txcr, rxcr, rxcr_org;
> > +
> > + /* set RGMII speed */
> > + val = ave_r32(ndev, AVE_TXCR);
> > + val &= ~(AVE_TXCR_TXSPD_100 | AVE_TXCR_TXSPD_1G);
> > +
> > + if (priv->phy_mode == PHY_INTERFACE_MODE_RGMII &&
> > + phydev->speed == SPEED_1000)
> > + val |= AVE_TXCR_TXSPD_1G;
>
> Using phy_interface_is_rgmii() would be more robust here.

It's convenience.

> > + else if (phydev->speed == SPEED_100)
> > + val |= AVE_TXCR_TXSPD_100;
> > +
> > + ave_w32(ndev, AVE_TXCR, val);
> > +
> > + /* set RMII speed (100M/10M only) */
> > + if (priv->phy_mode != PHY_INTERFACE_MODE_RGMII) {
>
> PHY_INTERFACE_MODE_MII, PHY_INTERFACE_MODE_REVMII,
> PHY_INTERFACE_MODE_RMII would all qualify here presumably so you need
> this check to be more restrictive to just the modes that you support.

I'll rewrite it to check the supported modes restrictly.

> > + val = ave_r32(ndev, AVE_LINKSEL);
> > + if (phydev->speed == SPEED_10)
> > + val &= ~AVE_LINKSEL_100M;
> > + else
> > + val |= AVE_LINKSEL_100M;
> > + ave_w32(ndev, AVE_LINKSEL, val);
> > + }
> > +
> > + /* check current RXCR/TXCR */
> > + rxcr = ave_r32(ndev, AVE_RXCR);
> > + txcr = ave_r32(ndev, AVE_TXCR);
> > + rxcr_org = rxcr;
> > +
> > + if (phydev->duplex)
> > + rxcr |= AVE_RXCR_FDUPEN;
> > + else
> > + rxcr &= ~AVE_RXCR_FDUPEN;
> > +
> > + if (phydev->pause) {
> > + rxcr |= AVE_RXCR_FLOCTR;
> > + txcr |= AVE_TXCR_FLOCTR;
>
> You must also check for phydev->asym_pause and keep in mind that
> phydev->pause and phydev->asym_pause reflect what the link partner
> reflects, you need to implement .get_pauseparam and .set_pauseparam or
> default to flow control ON (which is what you are doing here).

I see.
I'll consider how to implement flow control with pause and asym_pause.

> > + } else {
> > + rxcr &= ~AVE_RXCR_FLOCTR;
> > + txcr &= ~AVE_TXCR_FLOCTR;
> > + }
> > +
> > + if (rxcr_org != rxcr) {
> > + /* disable Rx mac */
> > + ave_w32(ndev, AVE_RXCR, rxcr & ~AVE_RXCR_RXEN);
> > + /* change and enable TX/Rx mac */
> > + ave_w32(ndev, AVE_TXCR, txcr);
> > + ave_w32(ndev, AVE_RXCR, rxcr);
> > + }
> > +
> > + if (phydev->link)
> > + netif_carrier_on(ndev);
> > + else
> > + netif_carrier_off(ndev);
>
> This is not necessary, PHYLIB is specifically taking care of that.

Okay, I'll remove it.

> > +
> > + phy_print_status(phydev);
> > +}
> > +
> > +static int ave_init(struct net_device *ndev)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > + struct device *dev = ndev->dev.parent;
> > + struct device_node *phy_node, *np = dev->of_node;
> > + struct phy_device *phydev;
> > + const void *mac_addr;
> > + u32 supported;
> > +
> > + /* get mac address */
> > + mac_addr = of_get_mac_address(np);
> > + if (mac_addr)
> > + ether_addr_copy(ndev->dev_addr, mac_addr);
> > +
> > + /* if the mac address is invalid, use random mac address */
> > + if (!is_valid_ether_addr(ndev->dev_addr)) {
> > + eth_hw_addr_random(ndev);
> > + dev_warn(dev, "Using random MAC address: %pM\n",
> > + ndev->dev_addr);
> > + }
> > +
> > + /* attach PHY with MAC */
> > + phy_node = of_get_next_available_child(np, NULL);
>
> You should be using a "phy-handle" property to connect to a designated
> PHY, not the next child DT node.

Yes, I found it was wrong. I'll fix it.

> > + phydev = of_phy_connect(ndev, phy_node,
> > + ave_adjust_link, 0, priv->phy_mode);
> > + if (!phydev) {
> > + dev_err(dev, "could not attach to PHY\n");
> > + return -ENODEV;
> > + }
> > + of_node_put(phy_node);
> > +
> > + priv->phydev = phydev;
> > + phydev->autoneg = AUTONEG_ENABLE;
> > + phydev->speed = 0;
> > + phydev->duplex = 0;
>
> This is not necessary.

I see. I'll remove it.

> > +
> > + dev_info(dev, "connected to %s phy with id 0x%x\n",
> > + phydev->drv->name, phydev->phy_id);
> > +
> > + if (priv->phy_mode != PHY_INTERFACE_MODE_RGMII) {
> > + supported = phydev->supported;
> > + phydev->supported &= ~PHY_GBIT_FEATURES;
> > + phydev->supported |= supported & PHY_BASIC_FEATURES;
>
> One of these two statements is redundant here.

I'll shirink the statements.

> > + }
> > +
> > + /* PHY interrupt stop instruction is needed because the interrupt
> > + * continues to assert.
> > + */
> > + phy_stop_interrupts(phydev);
>
> Wait, what?

I've thought that PHY interrupts might be enabled, but It's wrong.

> > +
> > + /* When PHY driver can't handle its interrupt directly,
> > + * interrupt request always fails and polling method is used
> > + * alternatively. In this case, the libphy says
> > + * "libphy: uniphier-mdio: Can't get IRQ -1 (PHY)".
> > + */
> > + phy_start_interrupts(phydev);
> > +
> > + phy_start_aneg(phydev);
>
> No, no, phy_start() would take care of all of that correctly for you,
> you don't have have to do it just there because ave_open() eventually
> calls phy_start() for you, so just drop these two calls.

Oh, I see.
Once calling phy_start(), all are done.

> > +
> > + return 0;
> > +}
> > +
> > +static void ave_uninit(struct net_device *ndev)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > +
> > + phy_stop_interrupts(priv->phydev);
>
> You are missing a call to phy_stop() here, calling phy_stop_interrupts()
> directly should not happen.

I'll replace it.

> > + phy_disconnect(priv->phydev);
> > +}
> > +
> > +static int ave_open(struct net_device *ndev)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > + int entry;
> > + u32 val;
> > +
> > + /* initialize Tx work */
> > + priv->tx.proc_idx = 0;
> > + priv->tx.done_idx = 0;
> > + memset(priv->tx.desc, 0, sizeof(struct ave_desc) * priv->tx.ndesc);
> > +
> > + /* initialize Tx descriptor */
> > + for (entry = 0; entry < priv->tx.ndesc; entry++) {
> > + ave_wdesc(ndev, AVE_DESCID_TX, entry, 0, 0);
> > + ave_wdesc_addr(ndev, AVE_DESCID_TX, entry, 4, 0);
> > + }
> > + ave_w32(ndev, AVE_TXDC, AVE_TXDC_ADDR_START
> > + | (((priv->tx.ndesc * priv->desc_size) << 16) & AVE_TXDC_SIZE));
> > +
> > + /* initialize Rx work */
> > + priv->rx.proc_idx = 0;
> > + priv->rx.done_idx = 0;
> > + memset(priv->rx.desc, 0, sizeof(struct ave_desc) * priv->rx.ndesc);
> > +
> > + /* initialize Rx descriptor and buffer */
> > + for (entry = 0; entry < priv->rx.ndesc; entry++) {
> > + if (ave_set_rxdesc(ndev, entry))
> > + break;
> > + }
> > + ave_w32(ndev, AVE_RXDC0, AVE_RXDC0_ADDR_START
> > + | (((priv->rx.ndesc * priv->desc_size) << 16) & AVE_RXDC0_SIZE));
> > +
> > + /* enable descriptor */
> > + ave_desc_switch(ndev, AVE_DESC_START);
> > +
> > + /* initialize filter */
> > + ave_pfsel_init(ndev);
> > +
> > + /* set macaddr */
> > + val = le32_to_cpu(((u32 *)ndev->dev_addr)[0]);
> > + ave_w32(ndev, AVE_RXMAC1R, val);
> > + val = (u32)le16_to_cpu(((u16 *)ndev->dev_addr)[2]);
> > + ave_w32(ndev, AVE_RXMAC2R, val);
> > +
> > + /* set Rx configuration */
> > + /* full duplex, enable pause drop, enalbe flow control */
> > + val = AVE_RXCR_RXEN | AVE_RXCR_FDUPEN | AVE_RXCR_DRPEN |
> > + AVE_RXCR_FLOCTR | (AVE_MAX_ETHFRAME & AVE_RXCR_MPSIZ_MASK);
> > + ave_w32(ndev, AVE_RXCR, val);
> > +
> > + /* set Tx configuration */
> > + /* enable flow control, disable loopback */
> > + ave_w32(ndev, AVE_TXCR, AVE_TXCR_FLOCTR);
> > +
> > + /* enable timer, clear EN,INTM, and mask interval unit(BSCK) */
> > + val = ave_r32(ndev, AVE_IIRQC) & AVE_IIRQC_BSCK;
> > + val |= AVE_IIRQC_EN0 | (AVE_INTM_COUNT << 16);
> > + ave_w32(ndev, AVE_IIRQC, val);
> > +
> > + /* set interrupt mask */
> > + val = AVE_GI_RXIINT | AVE_GI_RXOVF | AVE_GI_TX;
> > + val |= (priv->internal_phy_interrupt) ? AVE_GI_PHY : 0;
> > + ave_irq_restore(ndev, val);
> > +
> > + napi_enable(&priv->napi_rx);
> > + napi_enable(&priv->napi_tx);
> > +
> > + phy_start(ndev->phydev);
> > + netif_start_queue(ndev);
> > +
> > + return 0;
> > +}
> > +
> > +static int ave_stop(struct net_device *ndev)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > + int entry;
> > +
> > + /* disable all interrupt */
> > + ave_irq_disable_all(ndev);
> > + disable_irq(ndev->irq);
> > +
> > + netif_tx_disable(ndev);
> > + phy_stop(ndev->phydev);
> > + napi_disable(&priv->napi_tx);
> > + napi_disable(&priv->napi_rx);
> > +
> > + /* free Tx buffer */
> > + for (entry = 0; entry < priv->tx.ndesc; entry++) {
> > + if (!priv->tx.desc[entry].skbs)
> > + continue;
> > +
> > + ave_dma_unmap(ndev, &priv->tx.desc[entry], DMA_TO_DEVICE);
> > + dev_kfree_skb_any(priv->tx.desc[entry].skbs);
> > + priv->tx.desc[entry].skbs = NULL;
> > + }
> > + priv->tx.proc_idx = 0;
> > + priv->tx.done_idx = 0;
> > +
> > + /* free Rx buffer */
> > + for (entry = 0; entry < priv->rx.ndesc; entry++) {
> > + if (!priv->rx.desc[entry].skbs)
> > + continue;
> > +
> > + ave_dma_unmap(ndev, &priv->rx.desc[entry], DMA_FROM_DEVICE);
> > + dev_kfree_skb_any(priv->rx.desc[entry].skbs);
> > + priv->rx.desc[entry].skbs = NULL;
> > + }
> > + priv->rx.proc_idx = 0;
> > + priv->rx.done_idx = 0;
> > +
> > + return 0;
> > +}
> > +
> > +static int ave_start_xmit(struct sk_buff *skb, struct net_device *ndev)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > + u32 proc_idx, done_idx, ndesc, cmdsts;
> > + int freepkt;
> > + unsigned char *buffptr = NULL; /* buffptr for descriptor */
> > + unsigned int len;
> > + dma_addr_t paddr;
> > +
> > + proc_idx = priv->tx.proc_idx;
> > + done_idx = priv->tx.done_idx;
> > + ndesc = priv->tx.ndesc;
> > + freepkt = ((done_idx + ndesc - 1) - proc_idx) % ndesc;
> > +
> > + /* not enough entry, then we stop queue */
> > + if (unlikely(freepkt < 2)) {
> > + netif_stop_queue(ndev);
> > + if (unlikely(freepkt < 1))
> > + return NETDEV_TX_BUSY;
> > + }
> > +
> > + priv->tx.desc[proc_idx].skbs = skb;
> > +
> > + /* add padding for short packet */
> > + if (skb_padto(skb, ETH_ZLEN)) {
> > + dev_kfree_skb_any(skb);
> > + return NETDEV_TX_OK;
> > + }
> > +
> > + buffptr = skb->data - NET_IP_ALIGN;
> > + len = max_t(unsigned int, ETH_ZLEN, skb->len);
> > +
> > + paddr = ave_dma_map(ndev, &priv->tx.desc[proc_idx], buffptr,
> > + len + NET_IP_ALIGN, DMA_TO_DEVICE);
> > + paddr += NET_IP_ALIGN;
> > +
> > + /* set buffer address to descriptor */
> > + ave_wdesc_addr(ndev, AVE_DESCID_TX, proc_idx, 4, paddr);
> > +
> > + /* set flag and length to send */
> > + cmdsts = AVE_STS_OWN | AVE_STS_1ST | AVE_STS_LAST
> > + | (len & AVE_STS_PKTLEN_TX);
> > +
> > + /* set interrupt per AVE_FORCE_TXINTCNT or when queue is stopped */
> > + if (!(proc_idx % AVE_FORCE_TXINTCNT) || netif_queue_stopped(ndev))
> > + cmdsts |= AVE_STS_INTR;
> > +
> > + /* disable checksum calculation when skb doesn't calurate checksum */
> > + if (skb->ip_summed == CHECKSUM_NONE ||
> > + skb->ip_summed == CHECKSUM_UNNECESSARY)
> > + cmdsts |= AVE_STS_NOCSUM;
> > +
> > + /* set cmdsts */
> > + ave_wdesc(ndev, AVE_DESCID_TX, proc_idx, 0, cmdsts);
> > +
> > + priv->tx.proc_idx = (proc_idx + 1) % ndesc;
> > +
> > + return NETDEV_TX_OK;
> > +}
> > +
> > +static int ave_ioctl(struct net_device *ndev, struct ifreq *ifr, int cmd)
> > +{
> > + return phy_mii_ioctl(ndev->phydev, ifr, cmd);
> > +}
> > +
> > +static void ave_set_rx_mode(struct net_device *ndev)
> > +{
> > + int count, mc_cnt = netdev_mc_count(ndev);
> > + struct netdev_hw_addr *hw_adr;
> > + u32 val;
> > + u8 v4multi_macadr[6] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 };
> > + u8 v6multi_macadr[6] = { 0x33, 0x00, 0x00, 0x00, 0x00, 0x00 };
> > +
> > + /* MAC addr filter enable for promiscious mode */
> > + val = ave_r32(ndev, AVE_RXCR);
> > + if (ndev->flags & IFF_PROMISC || !mc_cnt)
> > + val &= ~AVE_RXCR_AFEN;
> > + else
> > + val |= AVE_RXCR_AFEN;
> > + ave_w32(ndev, AVE_RXCR, val);
> > +
> > + /* set all multicast address */
> > + if ((ndev->flags & IFF_ALLMULTI) || (mc_cnt > AVE_PF_MULTICAST_SIZE)) {
> > + ave_pfsel_macaddr_set(ndev, AVE_PFNUM_MULTICAST,
> > + v4multi_macadr, 1);
> > + ave_pfsel_macaddr_set(ndev, AVE_PFNUM_MULTICAST + 1,
> > + v6multi_macadr, 1);
> > + } else {
> > + /* stop all multicast filter */
> > + for (count = 0; count < AVE_PF_MULTICAST_SIZE; count++)
> > + ave_pfsel_stop(ndev, AVE_PFNUM_MULTICAST + count);
> > +
> > + /* set multicast addresses */
> > + count = 0;
> > + netdev_for_each_mc_addr(hw_adr, ndev) {
> > + if (count == mc_cnt)
> > + break;
> > + ave_pfsel_macaddr_set(ndev, AVE_PFNUM_MULTICAST + count,
> > + hw_adr->addr, 6);
> > + count++;
> > + }
> > + }
> > +}
> > +
> > +static struct net_device_stats *ave_stats(struct net_device *ndev)
> > +{
> > + struct ave_private *priv = netdev_priv(ndev);
> > + u32 drop_num = 0;
> > +
> > + priv->stats.rx_errors = ave_r32(ndev, AVE_BFCR);
> > +
> > + drop_num += ave_r32(ndev, AVE_RX0OVFFC);
> > + drop_num += ave_r32(ndev, AVE_SN5FC);
> > + drop_num += ave_r32(ndev, AVE_SN6FC);
> > + drop_num += ave_r32(ndev, AVE_SN7FC);
> > + priv->stats.rx_dropped = drop_num;
> > +
> > + return &priv->stats;
> > +}
> > +
> > +static int ave_set_mac_address(struct net_device *ndev, void *p)
> > +{
> > + int ret = eth_mac_addr(ndev, p);
> > + u32 val;
> > +
> > + if (ret)
> > + return ret;
> > +
> > + /* set macaddr */
> > + val = le32_to_cpu(((u32 *)ndev->dev_addr)[0]);
> > + ave_w32(ndev, AVE_RXMAC1R, val);
> > + val = (u32)le16_to_cpu(((u16 *)ndev->dev_addr)[2]);
> > + ave_w32(ndev, AVE_RXMAC2R, val);
> > +
> > + /* pfsel unicast entry */
> > + ave_pfsel_macaddr_set(ndev, AVE_PFNUM_UNICAST, ndev->dev_addr, 6);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct net_device_ops ave_netdev_ops = {
> > + .ndo_init = ave_init,
> > + .ndo_uninit = ave_uninit,
> > + .ndo_open = ave_open,
> > + .ndo_stop = ave_stop,
> > + .ndo_start_xmit = ave_start_xmit,
> > + .ndo_do_ioctl = ave_ioctl,
> > + .ndo_set_rx_mode = ave_set_rx_mode,
> > + .ndo_get_stats = ave_stats,
> > + .ndo_set_mac_address = ave_set_mac_address,
> > +};
> > +
> > +static int ave_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct device_node *np = dev->of_node;
> > + u32 desc_bits, ave_id;
> > + struct reset_control *rst;
> > + struct ave_private *priv;
> > + phy_interface_t phy_mode;
> > + struct net_device *ndev;
> > + struct resource *res;
> > + void __iomem *base;
> > + int irq, ret = 0;
> > + char buf[ETHTOOL_FWVERS_LEN];
> > +
> > + /* get phy mode */
> > + phy_mode = of_get_phy_mode(np);
> > + if (phy_mode < 0) {
> > + dev_err(dev, "phy-mode not found\n");
> > + return -EINVAL;
> > + }
> > +
> > + irq = platform_get_irq(pdev, 0);
> > + if (irq < 0) {
> > + dev_err(dev, "IRQ not found\n");
> > + return irq;
> > + }
> > +
> > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > + base = devm_ioremap_resource(dev, res);
> > + if (IS_ERR(base))
> > + return PTR_ERR(base);
> > +
> > + /* alloc netdevice */
> > + ndev = alloc_etherdev(sizeof(struct ave_private));
> > + if (!ndev) {
> > + dev_err(dev, "can't allocate ethernet device\n");
> > + return -ENOMEM;
> > + }
> > +
> > + ndev->base_addr = (unsigned long)base;
>
> This is deprecated as mentioned earlier, just store this in
> priv->base_adr or something.

Yes, Andrew teaches me in his comment and I'll replace it.

> > + ndev->irq = irq;
>
> Same here.

I'll move it to ave_private, too.

> > + ndev->netdev_ops = &ave_netdev_ops;
> > + ndev->ethtool_ops = &ave_ethtool_ops;
> > + SET_NETDEV_DEV(ndev, dev);
> > +
> > + /* support hardware checksum */
> > + ndev->features |= (NETIF_F_IP_CSUM | NETIF_F_RXCSUM);
> > + ndev->hw_features |= (NETIF_F_IP_CSUM | NETIF_F_RXCSUM);
> > +
> > + ndev->max_mtu = AVE_MAX_ETHFRAME - (ETH_HLEN + ETH_FCS_LEN);
> > +
> > + priv = netdev_priv(ndev);
> > + priv->ndev = ndev;
> > + priv->msg_enable = netif_msg_init(-1, AVE_DEFAULT_MSG_ENABLE);
> > + priv->phy_mode = phy_mode;
> > +
> > + /* get bits of descriptor from devicetree */
> > + of_property_read_u32(np, "socionext,desc-bits", &desc_bits);
> > + priv->desc_size = AVE_DESC_SIZE_32;
> > + if (desc_bits == 64)
> > + priv->desc_size = AVE_DESC_SIZE_64;
> > + else if (desc_bits != 32)
> > + dev_warn(dev, "Defaulting to 32bit descriptor\n");
>
> This should really be determined by the compatible string.

Okay, I'll reconsider about compatible strings for each SoCs.

> > +
> > + /* use internal phy interrupt */
> > + priv->internal_phy_interrupt =
> > + of_property_read_bool(np, "socionext,internal-phy-interrupt");
>
> Same here.

Ditto.

> > +
> > + /* setting private data for descriptor */
> > + priv->tx.daddr = IS_DESC_64BIT(priv) ? AVE_TXDM_64 : AVE_TXDM_32;
> > + priv->tx.ndesc = AVE_NR_TXDESC;
> > + priv->tx.desc = devm_kzalloc(dev,
> > + sizeof(struct ave_desc) * priv->tx.ndesc,
> > + GFP_KERNEL);
> > + if (!priv->tx.desc)
> > + return -ENOMEM;
> > +
> > + priv->rx.daddr = IS_DESC_64BIT(priv) ? AVE_RXDM_64 : AVE_RXDM_32;
> > + priv->rx.ndesc = AVE_NR_RXDESC;
> > + priv->rx.desc = devm_kzalloc(dev,
> > + sizeof(struct ave_desc) * priv->rx.ndesc,
> > + GFP_KERNEL);
> > + if (!priv->rx.desc)
> > + return -ENOMEM;
>
> If your network device driver is probed, but never used after that, that
> is the network device is not open, you just this memory sitting for
> nothing, you should consider moving that to ndo_open() time.

Indeed.
The driver allocates memory when the driver is opened. I'll reconsider it.

> > +
> > + /* enable clock */
> > + priv->clk = devm_clk_get(dev, NULL);
> > + if (IS_ERR(priv->clk))
> > + priv->clk = NULL;
> > + clk_prepare_enable(priv->clk);
>
> Same here with the clock, the block is clocked, so it can consume some
> amount of power, just do the necessary HW initialization with the clock
> enabled, then defer until ndo_open() before turning it back on.

Okay, also the clocks.

> > +
> > + /* reset block */
> > + rst = devm_reset_control_get(dev, NULL);
> > + if (!IS_ERR_OR_NULL(rst)) {
> > + reset_control_deassert(rst);
> > + reset_control_put(rst);
> > + }
>
> Ah so that's interesting, you need it clocked first, then reset, I guess
> that works :)

Yes, this device starts to enable clock first.

> > +
> > + /* reset mac and phy */
> > + ave_global_reset(ndev);
> > +
> > + /* request interrupt */
> > + ret = devm_request_irq(dev, irq, ave_interrupt,
> > + IRQF_SHARED, ndev->name, ndev);
> > + if (ret)
> > + goto err_req_irq;
>
> Same here, this is usually moved to ndo_open() for network drivers, but
> then remember not to use devm_, just normal request_irq() because it
> need to be balanced in ndo_close().

Okay, also interrupts without devm_, and I'll take care of ndo_close().

> This looks like a pretty good first submission, and there does not
> appear to be any obvious functional problems!

Thanks a lot for your helpful advice!

> --
> Florian

---
Best Regards,
Kunihiko Hayashi


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