netdev - Re: [PATCH net-next 1/2] tg3: Fix NETIF_F

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Date:	Fri, 20 May 2011 08:57:02 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	Matt Carlson <mcarlson@...adcom.com>
Cc:	Mahesh Bandewar <maheshb@...gle.com>,
	David Miller <davem@...emloft.net>,
	linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 1/2] tg3: Fix NETIF_F_LOOPBACK error

2011/5/20 Matt Carlson <mcarlson@...adcom.com>:
> On Thu, May 19, 2011 at 06:15:18PM -0700, Mahesh Bandewar wrote:
>> On Thu, May 19, 2011 at 6:11 PM, Matt Carlson <mcarlson@...adcom.com> wrote:
>> > Mahesh Bandewar noticed that the features cleanup in commit
>> > 0da0606f493c5cdab74bdcc96b12f4305ad94085, entitled
>> > "tg3: Consolidate all netdev feature assignments", mistakenly sets
>> > NETIF_F_LOOPBACK by default. ?This patch corrects the error.
>> >
>> > Signed-off-by: Matt Carlson <mcarlson@...adcom.com>
>> > ---
>> > ?drivers/net/tg3.c | ? ?3 ++-
>> > ?1 files changed, 2 insertions(+), 1 deletions(-)
>> >
>> > diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
>> > index 012ce70..0b78c5d 100644
>> > --- a/drivers/net/tg3.c
>> > +++ b/drivers/net/tg3.c
>> > @@ -15080,6 +15080,8 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
>> > ? ? ? ? ? ? ? ? ? ? ? ?features |= NETIF_F_TSO_ECN;
>> > ? ? ? ?}
>> >
>> > + ? ? ? dev->features |= features;
>> > +
>> > ? ? ? ?/*
>> > ? ? ? ? * Add loopback capability only for a subset of devices that support
>> > ? ? ? ? * MAC-LOOPBACK. Eventually this need to be enhanced to allow INT-PHY
>> > @@ -15090,7 +15092,6 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
>> > ? ? ? ? ? ? ? ?/* Add the loopback capability */
>> > ? ? ? ? ? ? ? ?features |= NETIF_F_LOOPBACK;
>> >
>> > - ? ? ? dev->features |= features;
>> > ? ? ? ?dev->hw_features |= features;
>> > ? ? ? ?dev->vlan_features |= features;
>> I think this line should go up too. Otherwise newly created vlan
>> device(s) will have spurious loopback bit set.
> Yes.  You are right.  I thought vlan_features functioned like
> hw_features.

Probably NETIF_F_LOOPBACK should be forcibly set on VLAN devices when
underlying device has it enabled. Just a quick thought for discussion.

Best Regards,
Michał Mirosław
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