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Date: Tue, 30 Jan 2024 21:27:54 +0000
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Vineeth Karumanchi <vineeth.karumanchi@....com>,
nicolas.ferre@...rochip.com, claudiu.beznea@...on.dev, davem@...emloft.net,
edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, linux@...linux.org.uk
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, git@....com
Subject: Re: [PATCH net-next 3/3] net: macb: Add ARP support to WOL
On 30/01/2024 10:48, Vineeth Karumanchi wrote:
> Add wake-on LAN support using ARP with the provision to select
> through ethtool. Advertise wakeup capability in the probe and
> get the supported modes from the device tree.
>
> Re-order MACB_WOL_<> macros for ease of extension.
> Add ARP support configurable through ethtool, "wolopts" variable in
> struct macb contains the current WOL options configured through ethtool.
>
> For WOL via ARP, ensure the IP address is assigned and
> report an error otherwise.
>
> Co-developed-by: Harini Katakam <harini.katakam@....com>
> Signed-off-by: Harini Katakam <harini.katakam@....com>
> Signed-off-by: Vineeth Karumanchi <vineeth.karumanchi@....com>
> ---
> drivers/net/ethernet/cadence/macb.h | 1 +
> drivers/net/ethernet/cadence/macb_main.c | 54 ++++++++++++++++++------
> 2 files changed, 43 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
> index f68ff163aa18..db7e95dc56e3 100644
> --- a/drivers/net/ethernet/cadence/macb.h
> +++ b/drivers/net/ethernet/cadence/macb.h
> @@ -1306,6 +1306,7 @@ struct macb {
> unsigned int jumbo_max_len;
>
> u32 wol;
> + u32 wolopts;
>
> /* holds value of rx watermark value for pbuf_rxcutthru register */
> u32 rx_watermark;
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index 47cbea58e6c3..cbe1a9de692a 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -38,6 +38,7 @@
> #include <linux/ptp_classify.h>
> #include <linux/reset.h>
> #include <linux/firmware/xlnx-zynqmp.h>
> +#include <linux/inetdevice.h>
> #include "macb.h"
>
> /* This structure is only used for MACB on SiFive FU540 devices */
> @@ -84,8 +85,9 @@ struct sifive_fu540_macb_mgmt {
> #define GEM_MTU_MIN_SIZE ETH_MIN_MTU
> #define MACB_NETIF_LSO NETIF_F_TSO
>
> -#define MACB_WOL_HAS_MAGIC_PACKET (0x1 << 0)
> -#define MACB_WOL_ENABLED (0x1 << 1)
> +#define MACB_WOL_ENABLED (0x1 << 0)
> +#define MACB_WOL_HAS_MAGIC_PACKET (0x1 << 1)
> +#define MACB_WOL_HAS_ARP_PACKET (0x1 << 2)
>
> #define HS_SPEED_10000M 4
> #define MACB_SERDES_RATE_10G 1
> @@ -3276,19 +3278,21 @@ static void macb_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
> {
> struct macb *bp = netdev_priv(netdev);
>
> - if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET) {
> + if (bp->wol & (MACB_WOL_HAS_MAGIC_PACKET | MACB_WOL_HAS_ARP_PACKET))
> phylink_ethtool_get_wol(bp->phylink, wol);
> + if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET)
> wol->supported |= WAKE_MAGIC;
> -
> - if (bp->wol & MACB_WOL_ENABLED)
> - wol->wolopts |= WAKE_MAGIC;
> - }
> + if (bp->wol & MACB_WOL_HAS_ARP_PACKET)
> + wol->supported |= WAKE_ARP;
> + /* Pass wolopts to ethtool */
> + wol->wolopts = bp->wolopts;
> }
>
> static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
> {
> struct macb *bp = netdev_priv(netdev);
> int ret;
> + bp->wolopts = 0;
as there will be another spin, could you please use reverse xmas-tree order.
> /* Pass the order to phylink layer */
> ret = phylink_ethtool_set_wol(bp->phylink, wol);
> @@ -3298,11 +3302,16 @@ static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
> if (!ret || ret != -EOPNOTSUPP)
> return ret;
>
> - if (!(bp->wol & MACB_WOL_HAS_MAGIC_PACKET) ||
> - (wol->wolopts & ~WAKE_MAGIC))
> + if (!(bp->wol & (MACB_WOL_HAS_MAGIC_PACKET | MACB_WOL_HAS_ARP_PACKET)) ||
> + (wol->wolopts & ~(WAKE_MAGIC | WAKE_ARP)))
> return -EOPNOTSUPP;
>
> if (wol->wolopts & WAKE_MAGIC)
> + bp->wolopts |= WAKE_MAGIC;
> + if (wol->wolopts & WAKE_ARP)
> + bp->wolopts |= WAKE_ARP;
> +
> + if (bp->wolopts)
> bp->wol |= MACB_WOL_ENABLED;
> else
> bp->wol &= ~MACB_WOL_ENABLED;
> @@ -5086,7 +5095,10 @@ static int macb_probe(struct platform_device *pdev)
> bp->wol = 0;
> if (of_property_read_bool(np, "magic-packet"))
> bp->wol |= MACB_WOL_HAS_MAGIC_PACKET;
> - device_set_wakeup_capable(&pdev->dev, bp->wol & MACB_WOL_HAS_MAGIC_PACKET);
> + if (of_property_read_bool(np, "wol-arp-packet"))
> + bp->wol |= MACB_WOL_HAS_ARP_PACKET;
> +
> + device_set_wakeup_capable(&pdev->dev, (bp->wol) ? true : false);
>
> bp->usrio = macb_config->usrio;
>
> @@ -5243,6 +5255,7 @@ static int __maybe_unused macb_suspend(struct device *dev)
> struct net_device *netdev = dev_get_drvdata(dev);
> struct macb *bp = netdev_priv(netdev);
> struct macb_queue *queue;
> + struct in_ifaddr *ifa;
> unsigned long flags;
> unsigned int q;
> u32 ctrlmask;
> @@ -5255,6 +5268,12 @@ static int __maybe_unused macb_suspend(struct device *dev)
> return 0;
>
> if (bp->wol & MACB_WOL_ENABLED) {
> + /* Check for IP address in WOL ARP mode */
> + ifa = rtnl_dereference(bp->dev->ip_ptr->ifa_list);
> + if ((bp->wolopts & WAKE_ARP) && !ifa) {
> + netdev_err(netdev, "IP address not assigned\n");
> + return -EOPNOTSUPP;
> + }
> spin_lock_irqsave(&bp->lock, flags);
>
> /* Disable Tx and Rx engines before disabling the queues,
> @@ -5291,6 +5310,17 @@ static int __maybe_unused macb_suspend(struct device *dev)
> if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
> queue_writel(queue, ISR, -1);
> }
> +
> + ctrlmask = 0;
> + if (bp->wolopts & WAKE_MAGIC)
> + ctrlmask = MACB_BIT(MAG);
> + if (bp->wolopts & WAKE_ARP) {
> + ctrlmask |= MACB_BIT(ARP);
> + /* write IP address into register */
> + ctrlmask |= cpu_to_be32p(&ifa->ifa_local)
> + & GENMASK(MACB_IP_SIZE - 1, 0);
> + }
> +
> /* Change interrupt handler and
> * Enable WoL IRQ on queue 0
> */
> @@ -5306,7 +5336,7 @@ static int __maybe_unused macb_suspend(struct device *dev)
> return err;
> }
> queue_writel(bp->queues, IER, GEM_BIT(WOL));
> - gem_writel(bp, WOL, MACB_BIT(MAG));
> + gem_writel(bp, WOL, ctrlmask);
> } else {
> err = devm_request_irq(dev, bp->queues[0].irq, macb_wol_interrupt,
> IRQF_SHARED, netdev->name, bp->queues);
> @@ -5318,7 +5348,7 @@ static int __maybe_unused macb_suspend(struct device *dev)
> return err;
> }
> queue_writel(bp->queues, IER, MACB_BIT(WOL));
> - macb_writel(bp, WOL, MACB_BIT(MAG));
> + macb_writel(bp, WOL, ctrlmask);
> }
> spin_unlock_irqrestore(&bp->lock, flags);
>
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