linux-kernel - Re: [PATCH net-next] Driver: Vmxnet3: Reinitialize vmxnet3 backend on wakeup from hibernate

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Message-ID: <alpine.DEB.2.02.1501091511210.20149@shri-linux.eng.vmware.com>
Date:	Fri, 9 Jan 2015 15:20:08 -0800 (PST)
From:	Shrikrishna Khare <skhare@...are.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
cc:	sbhatewara@...are.com, pv-drivers@...are.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Srividya Murali <smurali@...are.com>
Subject: Re: [PATCH net-next] Driver: Vmxnet3: Reinitialize vmxnet3 backend
 on wakeup from hibernate


Hi Sergei,

 Thanks for the review. I have addressed all the review comments and 
resubmitted the patch.

Thanks,
Shri

On Wed, 7 Jan 2015, Sergei Shtylyov wrote:

> Hello.
> 
> On 01/07/2015 08:56 PM, Shrikrishna Khare wrote:
> 
> > Failing to reinitialize on wakeup results in loss of network connectivity
> > for
> > vmxnet3 interface.
> 
> > Signed-off-by: Srividya Murali <smurali@...are.com>
> > Signed-off-by: Shrikrishna Khare <skhare@...are.com>
> > Reviewed-by: Shreyas N Bhatewara <sbhatewara@...are.com>
> > ---
> >   drivers/net/vmxnet3/vmxnet3_drv.c |   50
> > +++++++++++++++++++++---------------
> >   drivers/net/vmxnet3/vmxnet3_int.h |    4 +-
> >   2 files changed, 31 insertions(+), 23 deletions(-)
> 
> > diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c
> > b/drivers/net/vmxnet3/vmxnet3_drv.c
> > index 7af1f5c..124cb9f 100644
> > --- a/drivers/net/vmxnet3/vmxnet3_drv.c
> > +++ b/drivers/net/vmxnet3/vmxnet3_drv.c
> > @@ -3290,51 +3290,59 @@ skip_arp:
> >   static int
> >   vmxnet3_resume(struct device *device)
> >   {
> > -	int err, i = 0;
> > +	int err;
> >   	unsigned long flags;
> >   	struct pci_dev *pdev = to_pci_dev(device);
> >   	struct net_device *netdev = pci_get_drvdata(pdev);
> >   	struct vmxnet3_adapter *adapter = netdev_priv(netdev);
> > -	struct Vmxnet3_PMConf *pmConf;
> > 
> >   	if (!netif_running(netdev))
> >   		return 0;
> > 
> > -	/* Destroy wake-up filters. */
> > -	pmConf = adapter->pm_conf;
> > -	memset(pmConf, 0, sizeof(*pmConf));
> > -
> > -	adapter->shared->devRead.pmConfDesc.confVer = cpu_to_le32(1);
> > -	adapter->shared->devRead.pmConfDesc.confLen = cpu_to_le32(sizeof(
> > -								  *pmConf));
> > -	adapter->shared->devRead.pmConfDesc.confPA =
> > -		cpu_to_le64(adapter->pm_conf_pa);
> > -
> > -	netif_device_attach(netdev);
> >   	pci_set_power_state(pdev, PCI_D0);
> >   	pci_restore_state(pdev);
> >   	err = pci_enable_device_mem(pdev);
> >   	if (err != 0)
> > -		return err;
> > +		goto err;
> 
>    Why?
> 
> > 
> >   	pci_enable_wake(pdev, PCI_D0, 0);
> > 
> > +	vmxnet3_alloc_intr_resources(adapter);
> > +
> > +	/* During hibernate and suspend, device has to be reinitialized as the
> > +	 * device state need not be preserved.
> > +	 */
> > +
> > +	/* Need not check adapter state as other reset tasks cannot run during
> > +	 * device resume.
> > +	 */
> >   	spin_lock_irqsave(&adapter->cmd_lock, flags);
> >   	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
> > -			       VMXNET3_CMD_UPDATE_PMCFG);
> > +			       VMXNET3_CMD_QUIESCE_DEV);
> >   	spin_unlock_irqrestore(&adapter->cmd_lock, flags);
> > -	vmxnet3_alloc_intr_resources(adapter);
> > -	vmxnet3_request_irqs(adapter);
> > -	for (i = 0; i < adapter->num_rx_queues; i++)
> > -		napi_enable(&adapter->rx_queue[i].napi);
> > -	vmxnet3_enable_all_intrs(adapter);
> > +	vmxnet3_tq_cleanup_all(adapter);
> > +	vmxnet3_rq_cleanup_all(adapter);
> > 
> > -	return 0;
> > +	vmxnet3_reset_dev(adapter);
> > +	err = vmxnet3_activate_dev(adapter);
> > +	if (err) {
> > +		netdev_err(adapter->netdev,
> 
>    Not just 'netdev'?
> 
> > +			   "%s: failed to re-activate on resume, error: %d",
> > +		    netdev->name, err);
> 
>    Should have been aligned with the line right above. And isn't netdev->name
> printed by netdev_err() already?
> 
> > +		vmxnet3_force_close(adapter);
> > +		goto err;
> 
>    Why not just *return*?
> 
> > +	}
> > +	netif_device_attach(netdev);
> > +
> > +err:
> > +	return err;
> >   }
> [...]
> 
> WBR, Sergei
> 
> 
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