netdev - Re: [PATCH net-next 1/8] net: ipv4: refactor __ip_route_output_key

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Date:   Wed, 24 May 2017 20:05:08 -0700
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     David Ahern <dsahern@...il.com>
Cc:     "Rosen, Rami" <rami.rosen@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "nikolay@...ulusnetworks.com" <nikolay@...ulusnetworks.com>
Subject: Re: [PATCH net-next 1/8] net: ipv4: refactor __ip_route_output_key_hash

On Wed, May 24, 2017 at 6:10 PM, David Ahern <dsahern@...il.com> wrote:
> On 5/24/17 1:33 PM, Rosen, Rami wrote:
>> Hi, Rupa /David Ahern,
>>
>> First, thanks for this patch set!
>>
>> Second, it seems to me that something might be incorrect here.
>>
>> You have these additions in this patch  (1/8):
>> ...
>> +struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *flp,
>> +                                         const struct sk_buff *skb,
>> +                                         struct fib_result *res);
>> ...
>> +struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *fl4,
>> +                                     const struct sk_buff *skb)
>> +{
>> +     struct fib_result res;
>> +     struct rtable *rth;
>> +
>> +     res.tclassid    = 0;
>> +     res.fi          = NULL;
>> +     res.table       = NULL;
>> +
>> +     rcu_read_lock();
>> +     rth = ip_route_output_key_hash_rcu(net, fl4, &res, mp_hash);
>>       rcu_read_unlock();
>> +
>>       return rth;
>>  }
>> -EXPORT_SYMBOL_GPL(__ip_route_output_key_hash);
>> +EXPORT_SYMBOL_GPL(ip_route_output_key_hash);
>>
>>
>> So the third parameter to ip_route_output_key_hash_rcu() should be skb*, and the fourth parameter should be fib_result *. However, you do not pass the skb parameter
>> when calling ip_route_output_key_hash_rcu() in
>> ip_route_output_key_hash()  (in fact you don't use it at all),  and you pass mp_hash as the fourth parameter.
>
> Yep, it's a problem with the forward port of the first round of patches.

yep,

>
> Roopa: in include/net/route.h, __ip_route_output_key_hash should be
> removed as well.

ack, thanks Rami and david.

will fix it in v2.