netdev - Re: [PATCH net-next 2/2] ipoib: show VF broadcast address

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Date:   Wed, 12 Jun 2019 14:02:16 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Denis Kirjanov <kda@...ux-powerpc.org>
Cc:     davem@...emloft.net, dledford@...hat.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] ipoib: show VF broadcast address

On Wed, Jun 12, 2019 at 01:33:48PM +0200, Denis Kirjanov wrote:
> in IPoIB case we can't see a VF broadcast address for but
> can see for PF
> 
> Before:
> 11: ib1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 2044 qdisc pfifo_fast
> state UP mode DEFAULT group default qlen 256
>     link/infiniband
> 80:00:00:66:fe:80:00:00:00:00:00:00:24:8a:07:03:00:a4:3e:7c brd
> 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff
>     vf 0 MAC 14:80:00:00:66:fe, spoof checking off, link-state disable,
> trust off, query_rss off
> ...
> 
> After:
> 11: ib1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 2044 qdisc pfifo_fast
> state UP mode DEFAULT group default qlen 256
>     link/infiniband
> 80:00:00:66:fe:80:00:00:00:00:00:00:24:8a:07:03:00:a4:3e:7c brd
> 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff
>     vf 0     link/infiniband
> 80:00:00:66:fe:80:00:00:00:00:00:00:24:8a:07:03:00:a4:3e:7c brd
> 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff, spoof
> checking off, link-state disable, trust off, query_rss off
> ...
> 
> Signed-off-by: Denis Kirjanov <dkirjanov@...e.com>
> ---
>  net/core/rtnetlink.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index 2e1b9ffbe602..f70902b57a40 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -1248,6 +1248,7 @@ static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
>  	if (!vf)
>  		goto nla_put_vfinfo_failure;
>  	if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
> +	    nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast) ||
>  	    nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
>  	    nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
>  		    &vf_rate) ||

This doesn't seem right, IFLA_BROADCAST is 2 which is the same as
IFLA_VF_VLAN. You should add a new constant in the same enum as other
IFLA_VF_* attribute types expected in this context. You should then also
add an entry to ifla_vf_policy and account for the new attribute size in
rtnl_vfinfo_size().

Michal