netdev - Re: [PATCH net-next 2/6] sk_buff: track dst status in slow

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Message-ID: <20210730040824.097e0e9d@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 30 Jul 2021 04:08:24 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 2/6] sk_buff: track dst status in slow_gro

On Wed, 28 Jul 2021 18:24:00 +0200 Paolo Abeni wrote:
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 3ff18300d210..b1e5bbfcc926 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -992,6 +992,7 @@ static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
>   */
>  static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
>  {
> +	skb->slow_gro |= !!dst;
>  	skb->_skb_refdst = (unsigned long)dst;
>  }
>  
> @@ -1008,6 +1009,7 @@ static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
>  static inline void skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst)
>  {
>  	WARN_ON(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
> +	skb->slow_gro = !!dst;

why is this one = and not |= ?

>  	skb->_skb_refdst = (unsigned long)dst | SKB_DST_NOREF;
>  }