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Date: Wed, 18 Mar 2020 16:42:34 -0700 (PDT) From: David Miller <davem@...emloft.net> To: nikolay@...ulusnetworks.com Cc: netdev@...r.kernel.org, roopa@...ulusnetworks.com, bridge@...ts.linux-foundation.org Subject: Re: [PATCH net-next] net: bridge: vlan: include stats in dumps if requested From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com> Date: Wed, 18 Mar 2020 15:03:25 +0200 > @@ -170,11 +170,13 @@ struct bridge_stp_xstats { > /* Bridge vlan RTM header */ > struct br_vlan_msg { > __u8 family; > - __u8 reserved1; > + __u8 flags; > __u16 reserved2; > __u32 ifindex; > }; I can't allow this for two reasons: 1) Userspace explicitly initializing all members will now get a compile failure on the reference to ->reserved1 2) Userspace not initiailizing reserved fields, which worked previously, might send in flags that trigger the new behavior. Sorry, this is UAPI breakage.
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