netdev - Re: [PATCH][net-next] ipv6: drop container_of when convert dst to rt6

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Message-ID: <CAJFZqHxZc0obHNcM-hgsisxgmrN_qznKFojOGV5bCEiZn1Lu1A@mail.gmail.com>
Date:   Sun, 30 Sep 2018 17:38:47 +0800
From:   Li RongQing <roy.qing.li@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Li RongQing <lirongqing@...du.com>, netdev@...r.kernel.org
Subject: Re: [PATCH][net-next] ipv6: drop container_of when convert dst to rt6_info

>
> I don't understand why you are doing this? It is not going to be
> faster (or safer) than container_of. container_of provides the
> same functionality and is safe against position of the member
> in the structure.
>

In fact, most places are converting dst to rt6_info directly, and only
few place uses container_of


net/ipv6/ip6_output.c:  struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
net/ipv6/route.c:       const struct rt6_info *rt = (struct rt6_info *)dst;

-Li