netdev - Re: [PATCH net-next 7/8] mld: convert ip6_sf

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Date:   Tue, 9 Feb 2021 11:05:58 +0900
From:   Taehee Yoo <ap420073@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Netdev <netdev@...r.kernel.org>, dsahern@...nel.org,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH net-next 7/8] mld: convert ip6_sf_socklist to list macros

On Tue, 9 Feb 2021 at 03:31, Eric Dumazet <eric.dumazet@...il.com> wrote:
>

Hi Eric,
Thank you for the review!

>
>
> On 2/8/21 6:58 PM, Taehee Yoo wrote:
> > Currently, struct ip6_sf_socklist doesn't use list API so that code
> > shape is a little bit different from others.
> > So it converts ip6_sf_socklist to use list API so it would
> > improve readability.
> >
> > Signed-off-by: Taehee Yoo <ap420073@...il.com>
> > ---
> >  include/net/if_inet6.h  |  19 +-
> >  include/uapi/linux/in.h |   4 +-
> >  net/ipv6/mcast.c        | 387 +++++++++++++++++++++++++---------------
> >  3 files changed, 256 insertions(+), 154 deletions(-)
> >
> > diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
> > index babf19c27b29..6885ab8ec2e9 100644
> > --- a/include/net/if_inet6.h
> > +++ b/include/net/if_inet6.h
> > @@ -13,6 +13,7 @@
> >  #include <net/snmp.h>
> >  #include <linux/ipv6.h>
> >  #include <linux/refcount.h>
> > +#include <linux/types.h>
> >
> >  /* inet6_dev.if_flags */
> >
> > @@ -76,23 +77,19 @@ struct inet6_ifaddr {
> >  };
> >
> >  struct ip6_sf_socklist {
> > -     unsigned int            sl_max;
> > -     unsigned int            sl_count;
> > -     struct in6_addr         sl_addr[];
> > +     struct list_head        list;
> > +     struct in6_addr         sl_addr;
> > +     struct rcu_head         rcu;
> >  };
> >
>
> I dunno about readability, but :
>
> Your patches adds/delete more than 1000 lines, who is really going to review this ?
>

Sorry for that, I think I was so hasty.

> You replace dense arrays by lists, so the performance will likely be hurt,
> as cpu caches will be poorly used.
>

Thanks, I understand why the arrays have been using.
I will send a v2 patch, which contains only the necessary changes.

Thanks a lot,
Taehee Yoo