APPLIED _AGAIN_ APPLIED[Artful]: [SRU][Artful][Bionic][PATCH 0/1] ip_gre: remove the incorrect mtu limit for ipgre tap

[Khaled Elmously]

I applied this to master-next-backlog (sorry) - I actually applied it yesterday before Kleber sent this announcement.



On 2018-02-02 13:31:44 , Kleber Souza wrote:
> On 01/19/18 16:54, Joseph Salisbury wrote:
> > BugLink: http://bugs.launchpad.net/bugs/1743746
> > 
> > == SRU Justification ==
> > The following mainline commit introduced a regression in v4.10-rc1:
> > 61e84623ace3 ("net: centralize net_device min/max MTU checking")
> > 
> > In Artful and Bionic, it is not possible to configure GRE tunnel devices 
> > with a MTU larger than 1500; this impacts on Open vSwitch (which creates 
> > tunnel devices for GRE overlay networking) and the ip tools.
> > 
> > The kernel will error with:
> >   "gre_sys: Invalid MTU 65000 requested, hw max 1500"
> > 
> > The side effect of this is that if overlay networks are configured with 
> > high MTUs, the gre devices fragment the packets and networking is generally 
> > slow/broken.
> >    
> > This regression is now fixed by mainline commit cfddd4c33c25, which was 
> > added in v4.15-rc5.
> >  
> > 
> > == Fix ==
> > commit cfddd4c33c254954927942599d299b3865743146
> > Author: Xin Long <lucien.xin at gmail.com>
> > Date:   Mon Dec 18 14:24:35 2017 +0800
> > 
> >     ip_gre: remove the incorrect mtu limit for ipgre tap
> > 
> > 
> > == Regression Potential ==
> > Low.  This patch fixes a current regression.  It was cc'd to upstream stable
> > so had additional upstream review.
> > 
> > == Test Case ==
> > A test kernel was built with this patch and tested by the original bug reporter.
> > The bug reporter states the test kernel resolved the bug.
> > 
> > Xin Long (1):
> >   ip_gre: remove the incorrect mtu limit for ipgre tap
> > 
> >  net/ipv4/ip_gre.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> 
> Applied to artful/master-next branch.
> 
> Thanks,
> Kleber
> 
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