netdev - Re: [net-next 4/7] e1000e: Add support for S0ix

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Date:   Wed, 16 Oct 2019 17:02:31 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:     davem@...emloft.net, Sasha Neftin <sasha.neftin@...el.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Vitaly Lifshits <vitaly.lifshits@...el.com>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...ux.intel.com>,
        Aaron Brown <aaron.f.brown@...el.com>
Subject: Re: [net-next 4/7] e1000e: Add support for S0ix

On Wed, 16 Oct 2019 16:47:08 -0700, Jeff Kirsher wrote:
>  static int e1000e_pm_freeze(struct device *dev)
>  {
>  	struct net_device *netdev = dev_get_drvdata(dev);
> @@ -6650,6 +6822,9 @@ static int e1000e_pm_thaw(struct device *dev)
>  static int e1000e_pm_suspend(struct device *dev)
>  {
>  	struct pci_dev *pdev = to_pci_dev(dev);
> +	struct net_device *netdev = pci_get_drvdata(to_pci_dev(dev));
> +	struct e1000_adapter *adapter = netdev_priv(netdev);
> +	struct e1000_hw *hw = &adapter->hw;
>  	int rc;

reverse xmas tree?

>  
>  	e1000e_flush_lpic(pdev);
> @@ -6660,14 +6835,25 @@ static int e1000e_pm_suspend(struct device *dev)
>  	if (rc)
>  		e1000e_pm_thaw(dev);
>  
> +	/* Introduce S0ix implementation */
> +	if (hw->mac.type >= e1000_pch_cnp)
> +		e1000e_s0ix_entry_flow(adapter);

the entry/exit functions never fail, you can make them return void

>  	return rc;
>  }
>  
>  static int e1000e_pm_resume(struct device *dev)
>  {
>  	struct pci_dev *pdev = to_pci_dev(dev);
> +	struct net_device *netdev = pci_get_drvdata(to_pci_dev(dev));
> +	struct e1000_adapter *adapter = netdev_priv(netdev);
> +	struct e1000_hw *hw = &adapter->hw;
>  	int rc;
>  
> +	/* Introduce S0ix implementation */
> +	if (hw->mac.type >= e1000_pch_cnp)
> +		e1000e_s0ix_exit_flow(adapter);
> +
>  	rc = __e1000_resume(pdev);
>  	if (rc)
>  		return rc;