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    SubjectRe: regression: ip r change mss doesn't work in 2.6.38-git14
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    Le jeudi 24 mars 2011 à 16:52 +0100, Alessandro Suardi a écrit :
    > On Thu, Mar 24, 2011 at 4:21 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
    > > Le jeudi 24 mars 2011 à 16:08 +0100, Alessandro Suardi a écrit :
    > >> After fixing the display issue thanks to Chris Wilson, I now have
    > >> another problem
    > >> (which didn't exist in 2.6.38-git2); most websites outside of my DSL link don't
    > >> work properly (connection packet goes through, but the page load times out
    > >> within Firefox) unless I do
    > >>
    > >> ip r change default via 192.168.1.1 dev eth1 advmss 1400
    > >>
    > >> This however doesn't change advmss anymore:
    > >>
    > >> [root@duff ~]# ip r
    > >> default via 192.168.1.1 dev eth1
    > >> 169.254.0.0/16 dev eth1 scope link metric 1004
    > >> 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.8
    > >> [root@duff ~]# ip r change default via 192.168.1.1 dev eth1 advmss 1400
    > >> [root@duff ~]# ip r
    > >> default via 192.168.1.1 dev eth1
    > >> 169.254.0.0/16 dev eth1 scope link metric 1004
    > >> 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.8
    > >
    > > Indeed, we'll take a look, thanks for the report.
    > >
    > > In the time being you can do :
    > >
    > > ip ro change default via 192.168.1.1 dev eth1 advmss 1400 mtu 1500
    >
    > Thanks - this one works for me.
    >
    > I'm available to test patches if needed, though I have a feeling you
    > already have a handle on the issue and won't need that ;)

    ;)

    I am testing following patch :

    diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
    index 622ac4c..654ef5b 100644
    --- a/net/ipv4/fib_semantics.c
    +++ b/net/ipv4/fib_semantics.c
    @@ -251,7 +251,7 @@ static struct fib_info *fib_find_info(const struct fib_info *nfi)
    nfi->fib_prefsrc == fi->fib_prefsrc &&
    nfi->fib_priority == fi->fib_priority &&
    memcmp(nfi->fib_metrics, fi->fib_metrics,
    - sizeof(fi->fib_metrics)) == 0 &&
    + sizeof(u32) * RTAX_MAX) == 0 &&
    ((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_F_DEAD) == 0 &&
    (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0))
    return fi;


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