Subject: Re: unregister_netdevice: waiting for eth0 to become free. Usage
 count = 1
To: Wei Wang <weiwan@google.com>
References: <CALAqxLWVYgnTnwAwm7uNQ6P_Z8xFd96NQ+G_j1qT+h5F6habag@mail.gmail.com>
 <CALAqxLXG8X2nkLEHM63oiY=M17vcpU2+-ec7x_aBWDCqrj4U-Q@mail.gmail.com>
 <CAM_iQpW2=aKKUmWanbuhqXdZGxr_TqB5pQ+U+A0+=optuGX5-Q@mail.gmail.com>
 <CALAqxLXv60ReJu26omM6p=ZboEm-Z-3w+q0JcxLXDqqK5ohNoQ@mail.gmail.com>
 <CAEA6p_AL8uUghtZgp4OmqygcFs-Jiy286P5r6tRd+yeSWxR3KA@mail.gmail.com>
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 <CAEA6p_C_rEYkJhcniyy6HUHgNxWFoxWzZ-WHsaSmNDwx4D+RXQ@mail.gmail.com>
 <CAEA6p_AOcNkAWPc7NFBnr8QWi3eHdJiQ2=8D_DB_XthwSDL2+Q@mail.gmail.com>
 <CALAqxLUoV6EQvofTEv9whW1_QMPBPU7eJBhRFUjaSs7CGeRFww@mail.gmail.com>
 <CAM_iQpWMWg5ytDq2Y9p9uet1zowGuCX+eksyiyxu9vQ18WoPxQ@mail.gmail.com>
 <CAEA6p_CooRGNOQN3fosF0JLqmd9aOTuNHKNPE8cbrzDH6c176w@mail.gmail.com>
 <CAEA6p_COwXWP97wSHvzokmm8ckQ2QEd7=dfNH04ttDPm_z3bcg@mail.gmail.com>
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Cc: Cong Wang <xiyou.wangcong@gmail.com>,
        John Stultz <john.stultz@linaro.org>, Martin KaFai Lau <kafai@fb.com>,
        lkml <linux-kernel@vger.kernel.org>,
        Network Development <netdev@vger.kernel.org>,
        Linux USB List <linux-usb@vger.kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Felipe Balbi <felipe.balbi@linux.intel.com>
From: David Ahern <dsahern@gmail.com>
Message-ID: <ddebbddc-bb66-ed0f-423a-277d40f99f66@gmail.com>
Date: Fri, 11 Aug 2017 21:37:00 -0600
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On 8/11/17 6:25 PM, Wei Wang wrote:
> By "a patch to fix that" do you mean after your patch, for every rt6,
> rt6->rt6i_idev will be the same as rt6->dst.dev?

FIB entries should have them the same device with my patch.

The copies done (ip6_rt_cache_alloc and ip6_rt_pcpu_alloc) will have to
set dst.dev to loopback or VRF device for RTF_LOCAL routes; it's the
only way to get local traffic to work and this is similar to what IPv4 does.