Subject: Re: [PATCH net 1/2] r8169: add handling DASH when DASH is disabled

From: Heiner Kallweit <[email-masked]>
Date: Tue, 7 Nov 2023 08:12:36 +0100

On 06.11.2023 16:11, ChunHao Lin wrote:
> For devices that support DASH, even DASH is disabled, there may still
> exist a default firmware that will influence device behavior.
> So driver needs to handle DASH for devices that support DASH, no matter
> the DASH status is.
> 
AFAICS there's no functional change in patch 1 (except the dash disabled
message). It just prepares patch 2. That's worth mentioning.

> Fixes: ee7a1beb9759 ("r8169:call "rtl8168_driver_start" "rtl8168_driver_stop" only when hardware dash function is enabled")
> Signed-off-by: ChunHao Lin <[email-masked]>

stable should be cc'ed

> ---
>  drivers/net/ethernet/realtek/r8169_main.c | 37 +++++++++++++++++------
>  1 file changed, 27 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index 4b8251cdb436..8cbd7c96d9e1 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -624,6 +624,7 @@ struct rtl8169_private {
>  
>  	unsigned supports_gmii:1;
>  	unsigned aspm_manageable:1;
> +	unsigned dash_enable:1;

better: dash_enabled

>  	dma_addr_t counters_phys_addr;
>  	struct rtl8169_counters *counters;
>  	struct rtl8169_tc_offsets tc_offset;
> @@ -1253,14 +1254,26 @@ static bool r8168ep_check_dash(struct rtl8169_private *tp)
>  	return r8168ep_ocp_read(tp, 0x128) & BIT(0);
>  }
>  
> -static enum rtl_dash_type rtl_check_dash(struct rtl8169_private *tp)
> +static bool rtl_check_dash(struct rtl8169_private *tp)

maybe better: rtl_dash_is_enabled()

> +{
> +	switch (tp->dash_type) {
> +	case RTL_DASH_DP:
> +		return r8168dp_check_dash(tp);
> +	case RTL_DASH_EP:
> +		return r8168ep_check_dash(tp);
> +	default:
> +		return 0;

false instead of 0

> +	}
> +}
> +
> +static enum rtl_dash_type rtl_check_dash_type(struct rtl8169_private *tp)
>  {

maybe better: rtl_get_dash_type()

>  	switch (tp->mac_version) {
>  	case RTL_GIGA_MAC_VER_28:
>  	case RTL_GIGA_MAC_VER_31:
> -		return r8168dp_check_dash(tp) ? RTL_DASH_DP : RTL_DASH_NONE;
> +		return RTL_DASH_DP;
>  	case RTL_GIGA_MAC_VER_51 ... RTL_GIGA_MAC_VER_53:
> -		return r8168ep_check_dash(tp) ? RTL_DASH_EP : RTL_DASH_NONE;
> +		return RTL_DASH_EP;
>  	default:
>  		return RTL_DASH_NONE;
>  	}
> @@ -1453,7 +1466,7 @@ static void __rtl8169_set_wol(struct rtl8169_private *tp, u32 wolopts)
>  
>  	device_set_wakeup_enable(tp_to_dev(tp), wolopts);
>  
> -	if (tp->dash_type == RTL_DASH_NONE) {
> +	if (!tp->dash_enable) {
>  		rtl_set_d3_pll_down(tp, !wolopts);
>  		tp->dev->wol_enabled = wolopts ? 1 : 0;
>  	}
> @@ -2512,7 +2525,7 @@ static void rtl_wol_enable_rx(struct rtl8169_private *tp)
>  
>  static void rtl_prepare_power_down(struct rtl8169_private *tp)
>  {
> -	if (tp->dash_type != RTL_DASH_NONE)
> +	if (tp->dash_enable)
>  		return;
>  
>  	if (tp->mac_version == RTL_GIGA_MAC_VER_32 ||
> @@ -4867,7 +4880,7 @@ static int rtl8169_runtime_idle(struct device *device)
>  {
>  	struct rtl8169_private *tp = dev_get_drvdata(device);
>  
> -	if (tp->dash_type != RTL_DASH_NONE)
> +	if (tp->dash_enable)
>  		return -EBUSY;
>  
>  	if (!netif_running(tp->dev) || !netif_carrier_ok(tp->dev))
> @@ -4894,7 +4907,7 @@ static void rtl_shutdown(struct pci_dev *pdev)
>  	rtl_rar_set(tp, tp->dev->perm_addr);
>  
>  	if (system_state == SYSTEM_POWER_OFF &&
> -	    tp->dash_type == RTL_DASH_NONE) {
> +		!tp->dash_enable) {
>  		pci_wake_from_d3(pdev, tp->saved_wolopts);
>  		pci_set_power_state(pdev, PCI_D3hot);
>  	}
> @@ -5252,7 +5265,8 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  		rc = pci_disable_link_state(pdev, PCIE_LINK_STATE_L1);
>  	tp->aspm_manageable = !rc;
>  
> -	tp->dash_type = rtl_check_dash(tp);
> +	tp->dash_type = rtl_check_dash_type(tp);
> +	tp->dash_enable = rtl_check_dash(tp);
>  
>  	tp->cp_cmd = RTL_R16(tp, CPlusCmd) & CPCMD_MASK;
>  
> @@ -5323,7 +5337,7 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	/* configure chip for default features */
>  	rtl8169_set_features(dev, dev->features);
>  
> -	if (tp->dash_type == RTL_DASH_NONE) {
> +	if (!tp->dash_enable) {
>  		rtl_set_d3_pll_down(tp, true);
>  	} else {
>  		rtl_set_d3_pll_down(tp, false);
> @@ -5363,7 +5377,10 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  			    "ok" : "ko");
>  
>  	if (tp->dash_type != RTL_DASH_NONE) {
> -		netdev_info(dev, "DASH enabled\n");
> +		if (tp->dash_enable)
> +			netdev_info(dev, "DASH enabled\n");
> +		else
> +			netdev_info(dev, "DASH disabled\n");

alternative:
netdev_info(dev, "DASH %s\n", tp->dash_enabled ? "enabled" : "disabled")

>  		rtl8168_driver_start(tp);
>  	}
>