linux-kernel - Re: [PATCH net-next v1 1/4] net-e1000e: fix ethtool set_features taking new features into account too late

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Date:	Mon, 21 Nov 2011 16:04:06 -0800
From:	David Decotigny <david.decotigny@...gle.com>
To:	Michał Mirosław <mirqus@...il.com>
Cc:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [PATCH net-next v1 1/4] net-e1000e: fix ethtool set_features
 taking new features into account too late

Hello,

2011/11/21 Michał Mirosław <mirqus@...il.com>:
>>  static int e1000_set_features(struct net_device *netdev,
>> -       netdev_features_t features)
>> +                             netdev_features_t features)
>>  {
>>        struct e1000_adapter *adapter = netdev_priv(netdev);
>>        netdev_features_t changed = features ^ netdev->features;
>> +       int retval = 1;  /* telling netdev that we are updating
>> +                         * netdev->features by ourselves */
>> +
>> +       netdev->features = features;
>>
>>        if (changed & (NETIF_F_TSO | NETIF_F_TSO6))
>>                adapter->flags |= FLAG_TSO_FORCE;
>>
>>        if (!(changed & (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX |
>>                         NETIF_F_RXCSUM)))
>> -               return 0;
>> +               return retval;
>>
>
> Would be less code if you set netdev->features here...
>
>>        if (netif_running(netdev))
>>                e1000e_reinit_locked(adapter);
>>        else
>>                e1000e_reset(adapter);
>>
>> -       return 0;
>> +       return retval;
>
> ... and return 1 here, noting in a comment that e1000e_reinit_locked()
> might have changed netdev->features.

This would work, although I preferred the systematic approach for code
management reasons. But I will follow your recommendations. Waiting a
little (review of other patches) before sending the updated version.

Thanks!
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