netdev - Re: [PATCH net v5 5/6] ipv6: Dump route exceptions if requested

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Date:   Thu, 20 Jun 2019 01:57:32 +0200
From:   Stefano Brivio <sbrivio@...hat.com>
To:     David Ahern <dsahern@...il.com>
Cc:     David Miller <davem@...emloft.net>, Jianlin Shi <jishi@...hat.com>,
        Wei Wang <weiwan@...gle.com>, Martin KaFai Lau <kafai@...com>,
        Eric Dumazet <edumazet@...gle.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH net v5 5/6] ipv6: Dump route exceptions if requested

On Tue, 18 Jun 2019 09:19:53 -0600
David Ahern <dsahern@...il.com> wrote:

> On 6/18/19 7:20 AM, Stefano Brivio wrote:
> > diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> > index 0f60eb3a2873..7375f3b7d310 100644
> > --- a/net/ipv6/route.c
> > +++ b/net/ipv6/route.c
> > @@ -4854,33 +4854,94 @@ static bool fib6_info_uses_dev(const struct fib6_info *f6i,
> >  	return false;
> >  }
> >  
> > -int rt6_dump_route(struct fib6_info *rt, void *p_arg)
> > +/* Return -1 if done with node, number of handled routes on partial dump */
> > +int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip)  
> 
> Changing the return code of rt6_dump_route should be a separate patch.

I guess the purpose would be to highlight how existing cases are
changed, but that looks rather trivial to me. Anyway, changed in v6.

> > +	if (filter->dump_routes) {
> > +		if (skip) {
> > +			skip--;
> > +		} else {
> > +			if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL,
> > +					  0, RTM_NEWROUTE,
> > +					  NETLINK_CB(arg->cb->skb).portid,
> > +					  arg->cb->nlh->nlmsg_seq, flags)) {
> > +				return 0;
> > +			}
> > +			count++;
> > +		}
> > +	}
> > +
> > +	if (!filter->dump_exceptions)
> > +		return -1;
> > +  
> 
> And the dump of the exception bucket should be a standalone function.
> You will see why with net-next (it is per fib6_nh).

Sure, no way around it now, changed in v6.

-- 
Stefano