Hi Ilya,

Thanks for the checking. Present travis is using 4.9.171 and build passed.
I will check out the reason why it breaks for 4.9.176.

You patch for TravisCI is great, thank you for that!

Thanks,
Yifeng

On Fri, May 17, 2019 at 3:08 AM Ilya Maximets <i.maxim...@samsung.com> wrote:
>
> On 10.05.2019 22:30, Yifeng Sun wrote:
> > From: Florian Westphal <f...@strlen.de>
> >
> > Upstream commit:
> >     commit 70b095c84326640eeacfd69a411db8fc36e8ab1a
> >     Author: Florian Westphal <f...@strlen.de>
> >     Date:   Sat Jul 14 01:14:01 2018 +0200
> >
> >     ipv6: remove dependency of nf_defrag_ipv6 on ipv6 module
> >
> >     IPV6=m
> >     DEFRAG_IPV6=m
> >     CONNTRACK=y yields:
> >
> >     net/netfilter/nf_conntrack_proto.o: In function `nf_ct_netns_do_get':
> >     net/netfilter/nf_conntrack_proto.c:802: undefined reference to 
> > `nf_defrag_ipv6_enable'
> >     net/netfilter/nf_conntrack_proto.o:(.rodata+0x640): undefined reference 
> > to `nf_conntrack_l4proto_icmpv6'
> >
> >     Setting DEFRAG_IPV6=y causes undefined references to ip6_rhash_params
> >     ip6_frag_init and ip6_expire_frag_queue so it would be needed to force
> >     IPV6=y too.
> >
> >     This patch gets rid of the 'followup linker error' by removing
> >     the dependency of ipv6.ko symbols from netfilter ipv6 defrag.
> >
> >     Shared code is placed into a header, then used from both.
> >
> >     Signed-off-by: Florian Westphal <f...@strlen.de>
> >     Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
> >
> > This patch backports the above upstream patch to OVS.
> >
> > Cc: Florian Westphal <f...@strlen.de>
> > Signed-off-by: Yifeng Sun <pkusunyif...@gmail.com>
> > Acked-by: Yi-Hung Wei <yihung....@gmail.com>
> > ---
> >  acinclude.m4                                  | 2 ++
> >  datapath/conntrack.c                          | 1 +
> >  datapath/linux/Modules.mk                     | 1 +
> >  datapath/linux/compat/include/net/ipv6_frag.h | 8 ++++++++
> >  4 files changed, 12 insertions(+)
> >  create mode 100644 datapath/linux/compat/include/net/ipv6_frag.h
> >
>
> Hi. This seems like not a full set of required changes.
> This patch doesn't fix the compat implementation of nf_conntrack_reasm.c:
>     datapath/linux/compat/nf_conntrack_reasm.c
> It uses 'struct frag_queue' that was moved to a new header and some functions
> and structures like 'ip6_frag_init'  and 'ip6_rhash_params'.
> In practice we have a broken build with kernel 4.9.176 where the same upstream
> patch was backported.
>
> I'll be good if someone could take care of this.
>
> BTW, I have a patch for TravisCI to always check with the latest stable 
> versions,
> i.e. if KERNEL=4.9 specified in matrix, Travis will check the latest 4.9.x and
> will try to build with it. Would like to hear if this is an interesting 
> feature
> or not.
>
> Best regards, Ilya Maximets.
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