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Message-ID: <1461039464.10638.150.camel@edumazet-glaptop3.roam.corp.google.com> Date: Mon, 18 Apr 2016 21:17:44 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: David Miller <davem@...emloft.net>, Xin Long <lucien.xin@...il.com> Cc: roopa@...ulusnetworks.com, netdev@...r.kernel.org, jhs@...atatu.com, tgraf@...g.ch, nicolas.dichtel@...nd.com Subject: Re: [PATCH net-next v5] rtnetlink: add new RTM_GETSTATS message to dump link stats On Mon, 2016-04-18 at 23:41 -0400, David Miller wrote: > From: Roopa Prabhu <roopa@...ulusnetworks.com> > Date: Mon, 18 Apr 2016 14:10:19 -0700 > > > This patch adds a new RTM_GETSTATS message to query link stats via > > netlink from the kernel. RTM_NEWLINK also dumps stats today, but > > RTM_NEWLINK returns a lot more than just stats and is expensive in > > some cases when frequent polling for stats from userspace is a > > common operation. > > I'm holding off on this until we sort out the 64-bit netlink > attribute alignment issue. > > Meanwhile, I'll some kind of a fix into the tree for the > rtnl_fill_stats() change so that it doesn't cause unaligned > accesses. Also it looks like my previous feedback for sctp_get_sctp_info() has been ignored. <Quoting http://www.spinics.net/lists/netdev/msg372523.html > info is not guaranteed to be aligned on 8 bytes. You need to use put_unaligned() Check commit ff5d749772018 ("tcp: beware of alignments in tcp_get_info()") for details. </quote>
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