netdev - Re: [PATCH net-next v2 2/2] ipv4: use dst hint for ipv4 list receive

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Date:   Mon, 18 Nov 2019 17:31:08 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     David Ahern <dsahern@...il.com>, netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Edward Cree <ecree@...arflare.com>
Subject: Re: [PATCH net-next v2 2/2] ipv4: use dst hint for ipv4 list receive

Hi,

Thank you for the feedback.

On Mon, 2019-11-18 at 09:07 -0700, David Ahern wrote:
> On 11/18/19 4:01 AM, Paolo Abeni wrote:
> > @@ -535,9 +540,20 @@ static void ip_sublist_rcv_finish(struct list_head *head)
> >  	}
> >  }
> >  
> > +static bool ip_can_cache_route_hint(struct net *net, struct rtable *rt)
> > +{
> > +	return rt->rt_type != RTN_BROADCAST &&
> > +#ifdef CONFIG_IP_MULTIPLE_TABLES
> > +	       !net->ipv6.fib6_has_custom_rules;
> 
> that should be ipv4, not ipv6, right?

Indeed. More coffee needed here, sorry.

> Also, for readability it would be better to have 2 helpers in
> include//net/fib_rules.h that return true false and manage the net
> namespace issue.

Double checking I parsed the above correctly. Do you mean something
like the following - I think net/ip_fib.h fits more, as it already
deals with CONFIG_IP_MULTIPLE_TABLES?

---
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 52b2406a5dfc..b6c5cd544402 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -272,6 +272,11 @@ void fib_free_table(struct fib_table *tb);
 #define TABLE_LOCAL_INDEX      (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
 #define TABLE_MAIN_INDEX       (RT_TABLE_MAIN  & (FIB_TABLE_HASHSZ - 1))
 
+static bool fib4_has_custom_rules(struct net *net)
+{
+       return 0;
+}
+
 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
 {
        struct hlist_node *tb_hlist;
@@ -341,6 +346,11 @@ void __net_exit fib4_rules_exit(struct net *net);
 struct fib_table *fib_new_table(struct net *net, u32 id);
 struct fib_table *fib_get_table(struct net *net, u32 id);
 
+static bool fib4_has_custom_rules(struct net *net)
+{
+       return net->ipv4.fib_has_custom_rules;
+}
+
 int __fib_lookup(struct net *net, struct flowi4 *flp,
                 struct fib_result *res, unsigned int flags);
---
plus something similar for the previous patch, in include/net/ip6_fib.h

Thank you,

Paolo