netdev - Re: [PATCH iproute2] iproute: Pass RTM_F_CLONED on dump to fetch cached routes to be flushed

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Message-ID: <209bcb66-2d57-eecf-d1a0-cc86af034e95@gmail.com>
Date:   Mon, 24 Jun 2019 15:55:49 -0600
From:   David Ahern <dsahern@...il.com>
To:     Stefano Brivio <sbrivio@...hat.com>,
        Stephen Hemminger <stephen@...workplumber.org>
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 iproute2] iproute: Pass RTM_F_CLONED on dump to fetch
 cached routes to be flushed

On 6/14/19 7:33 PM, Stefano Brivio wrote:
> diff --git a/ip/iproute.c b/ip/iproute.c
> index 2b3dcc5dbd53..192442b42062 100644
> --- a/ip/iproute.c
> +++ b/ip/iproute.c
> @@ -1602,6 +1602,16 @@ static int save_route_prep(void)
>  	return 0;
>  }
>  
> +static int iproute_flush_flags(struct nlmsghdr *nlh, int reqlen)

rename that to iproute_flush_filter to be consistent with
iproute_dump_filter.

Actually, why can't the flush code use iproute_dump_filter?

> +{
> +	struct rtmsg *rtm = NLMSG_DATA(nlh);
> +
> +	if (filter.cloned)
> +		rtm->rtm_flags |= RTM_F_CLONED;
> +
> +	return 0;
> +}
> +
>  static int iproute_flush(int family, rtnl_filter_t filter_fn)
>  {
>  	time_t start = time(0);
> @@ -1624,7 +1634,7 @@ static int iproute_flush(int family, rtnl_filter_t filter_fn)
>  	filter.flushe = sizeof(flushb);
>  
>  	for (;;) {
> -		if (rtnl_routedump_req(&rth, family, NULL) < 0) {
> +		if (rtnl_routedump_req(&rth, family, iproute_flush_flags) < 0) {
>  			perror("Cannot send dump request");
>  			return -2;
>  		}
>