netdev - Re: [PATCH net-next, v4] netlink: support dumping IPv4 multicast addresses

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Message-ID: <CADXeF1G1G8F4BK2YienEkVHVpGSmF2wQnOFnE+BwzaCBexv3SQ@mail.gmail.com>
Date: Thu, 9 Jan 2025 21:04:33 +0900
From: Yuyang Huang <yuyanghuang@...gle.com>
To: Paolo Abeni <pabeni@...hat.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Simon Horman <horms@...nel.org>, David Ahern <dsahern@...nel.org>, 
	roopa@...ulusnetworks.com, jiri@...nulli.us, stephen@...workplumber.org, 
	jimictw@...gle.com, prohr@...gle.com, liuhangbin@...il.com, 
	nicolas.dichtel@...nd.com, andrew@...n.ch, netdev@...r.kernel.org, 
	Maciej Żenczykowski <maze@...gle.com>, 
	Lorenzo Colitti <lorenzo@...gle.com>
Subject: Re: [PATCH net-next, v4] netlink: support dumping IPv4 multicast addresses

Hi Paolo

Thanks for the review feedback.

>I suspect the above chunk confuses the user-space as inet_fill_ifaddr()
>still get the 'event' value from fillargs->event

You're right, I missed initializing the event field in the fillargs
structure. It's a bug introduced in the v4 patch during refactoring. I
will fix it in the v5 patch.

>Also, this will need a paired self-test - even something very simple
>just exercising the new code.

Sure, I can send separate patch for adding self-test, but please let
me know if I should include the self-test in the same patch

Thanks
Yuyang


On Thu, Jan 9, 2025 at 8:30 PM Paolo Abeni <pabeni@...hat.com> wrote:
>
> On 1/9/25 8:22 AM, Yuyang Huang wrote:
> > @@ -1889,15 +1935,16 @@ static u32 inet_base_seq(const struct net *net)
> >       return res;
> >  }
> >
> > -static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
> > +static int inet_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
> > +                       enum addr_type_t type)
> >  {
> >       const struct nlmsghdr *nlh = cb->nlh;
> >       struct inet_fill_args fillargs = {
> >               .portid = NETLINK_CB(cb->skb).portid,
> >               .seq = nlh->nlmsg_seq,
> > -             .event = RTM_NEWADDR,
> >               .flags = NLM_F_MULTI,
> >               .netnsid = -1,
> > +             .type = type,
>
> This patch is apparently breaking a few tests:
>
> https://netdev.bots.linux.dev/contest.html?branch=net-next-2025-01-09--09-00&executor=vmksft-net-dbg&pw-n=0&pass=0
> https://netdev.bots.linux.dev/contest.html?branch=net-next-2025-01-09--09-00&executor=vmksft-nf-dbg&pw-n=0&pass=0
> https://netdev.bots.linux.dev/contest.html?branch=net-next-2025-01-09--09-00&executor=vmksft-nf&pw-n=0&pass=0
>
> I suspect the above chunk confuses the user-space as inet_fill_ifaddr()
> still get the 'event' value from fillargs->event
>
> Also, this will need a paired self-test - even something very simple
> just exercising the new code.
>
> Thanks,
>
> Paolo
>