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Date:	Mon, 2 Nov 2009 16:26:21 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Naohiro Ooiwa <nooiwa@...aclelinux.com>
Cc:	jesse.brandeburg@...el.com, peter.p.waskiewicz.jr@...el.com,
	john.ronciak@...el.com, davem@...emloft.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, svaidy@...ux.vnet.ibm.com,
	e1000-devel@...ts.sourceforge.net
Subject: Re: [PATCH] e1000: the power down when running ifdown command

2009/10/31 Naohiro Ooiwa <nooiwa@...aclelinux.com>:
> Hi All
>
> I resend my patch.
> Sorry, my previous mail lacked an explanation.
>
>
> The e1000 driver doesn't let the power down when running ifdown command.
> So, I set to the D3hot state of a PCI device at the end of e1000_close().
>
> With this modification, e1000 driver reduces power by ifdown.
> It's about 6 watts when I measured a total power of one server machine
> in my environment.
>
> I tested this patch. The result is good enough to me.
>
> Could you please check my patch ?
> If I should have other considerations, please tell me.
>
>
> Thanks you.
> Naohiro Ooiwa
>
>
>
> Signed-off-by: Naohiro Ooiwa <nooiwa@...aclelinux.com>
> ---
>  drivers/net/e1000/e1000_main.c |   32 ++++++++++++++++++++++++++++++++
>  1 files changed, 32 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
> index bcd192c..12e1a42 100644
> --- a/drivers/net/e1000/e1000_main.c
> +++ b/drivers/net/e1000/e1000_main.c
> @@ -26,6 +26,11 @@
>
>  *******************************************************************************/
>
> +/*
> + * define this if you want pci save power while ifdown.
> + */
> +#define E1000_PCI_POWER_SAVE
> +
>  #include "e1000.h"
>  #include <net/ip6_checksum.h>
>
> @@ -1248,6 +1253,23 @@ static int e1000_open(struct net_device *netdev)
>        struct e1000_hw *hw = &adapter->hw;
>        int err;
>
> +#ifdef E1000_PCI_POWER_SAVE
> +       struct pci_dev *pdev = adapter->pdev;
> +
> +       pci_set_power_state(pdev, PCI_D0);
> +       pci_restore_state(pdev);
> +
> +       if (adapter->need_ioport)
> +               err = pci_enable_device(pdev);
> +       else
> +               err = pci_enable_device_mem(pdev);
> +       if (err) {
> +               printk(KERN_ERR "e1000: Cannot enable PCI device from power-save\n");
> +               return err;
> +       }
> +       pci_set_master(pdev);
> +#endif
> +
>        /* disallow open during test */
>        if (test_bit(__E1000_TESTING, &adapter->flags))
>                return -EBUSY;
> @@ -1265,6 +1287,7 @@ static int e1000_open(struct net_device *netdev)
>                goto err_setup_rx;
>
>        e1000_power_up_phy(adapter);
> +       e1000_reset(adapter);
>
>        adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
>        if ((hw->mng_cookie.status &
> @@ -1341,6 +1364,15 @@ static int e1000_close(struct net_device *netdev)
>                e1000_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
>        }
>
> +#ifdef E1000_PCI_POWER_SAVE
> +#ifdef CONFIG_PM
> +       pci_save_state(adapter->pdev);
> +#endif
> +       pci_disable_device(adapter->pdev);
> +       pci_wake_from_d3(adapter->pdev, true);
> +       pci_set_power_state(adapter->pdev, PCI_D3hot);
> +#endif
> +
>        return 0;
>  }
>

I have added this patch to my tree for testing.  This patch requires a
fair amount of regression testing, so once its passed testing I will
push the patch to David/netdev.

-- 
Cheers,
Jeff
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