netdev - Re: [PATCH net-next v6 08/11] ipv6: Dump route exceptions if requested

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Date:   Thu, 20 Jun 2019 08:24:22 -0600
From:   David Ahern <dsahern@...il.com>
To:     Stefano Brivio <sbrivio@...hat.com>,
        David Miller <davem@...emloft.net>
Cc:     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-next v6 08/11] ipv6: Dump route exceptions if
 requested

On 6/19/19 5:59 PM, Stefano Brivio wrote:
> +	if (filter->dump_exceptions) {
> +		struct fib6_nh_exception_dump_walker w = { .dump = arg,
> +							   .rt = rt,
> +							   .flags = flags,
> +							   .skip = skip,
> +							   .count = 0 };
> +		int err;
> +
> +		if (rt->nh) {
> +			err = nexthop_for_each_fib6_nh(rt->nh,
> +						       rt6_nh_dump_exceptions,
> +						       &w);

much like ipv4, the skb can fill in the middle of a fib6_nh bucket, so
you need to track which nexthop is in progress.