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Date: Wed, 17 Sep 2014 13:46:55 -0700 From: Cong Wang <cwang@...pensource.com> To: Vlad Yasevich <vyasevich@...il.com> Cc: Florian Westphal <fw@...len.de>, Francesco Ruggeri <fruggeri@...sta.com>, netdev <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>, Weilong Chen <chenweilong@...wei.com> Subject: Re: Cannot move macvlan interface on top of bonding device On Wed, Sep 17, 2014 at 1:39 PM, Vlad Yasevich <vyasevich@...il.com> wrote: > On 09/17/2014 03:06 PM, Florian Westphal wrote: >> Cong Wang <cwang@...pensource.com> wrote: >>> On Wed, Sep 17, 2014 at 8:56 AM, Francesco Ruggeri <fruggeri@...sta.com> wrote: >>>> This used to work in older releases. >>>> The problem seems to be that commit f939981492 sets NETIF_F_NETNS_LOCAL >>>> on bonding interfaces, and commit 797f87f83 causes macvlan interfaces >>>> to inherit its features from the lower device. >>>> >>>> Is there a reason why NETIF_F_NETNS_LOCAL should be inherited from the >>>> lower device >>>> by macvlan interfaces? >>> >>> commit 797f87f83 looks wrong, it should not inherit NETIF_F_NETNS_LOCAL, >>> so just clear this flag. Please submit a patch. >> >> Under which conditions would NETIF_F_NETNS_LOCAL have to be inherited? >> (i.e., why is it inheritable in the first place?) > > macvlan code calls > features = netdev_increment_features(vlan->lowerdev->features, > features, > mask); > > where lowerdev->features contains the NETIF_F_NETNS_LOCAL bit. That > bit is not set in features or in mask. It is also not one of the ALL_FOR_ALL > bits so it's not turned off. > > As an example, here are the values from a quit test I ran: > > bond features = 0x400f3888 > features = 0x3b5a09 (mask is the same). > incremented features = 0x41bf389 > > NETIF_F_NETNS_LOCAL is still on. I think the comment on netdev_increment_features() is clear: * Computes a new feature set after adding a device with feature set * @one to the master device with current feature set @all. Will not * enable anything that is off in @mask. Returns the new feature set. And NETIF_F_NETNS_LOCAL is on in mask. > > May be a better solution is: > > features = netdev_increment_features(vlan->lowerdev->features & MACVLAN_FEATURS, > features, > mask); > > This way we start with only the feature MACVLAN is interested in. > Or clear it in mask? -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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