linux-kernel - Re: [PATCH net-next] ipv4: fib: Remove unnecessary encap

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Message-ID: <2b969f72-b5c3-4102-a7ea-77b5c726bc76@huawei.com>
Date: Wed, 25 Jun 2025 09:48:29 +0800
From: Yue Haibing <yuehaibing@...wei.com>
To: Kuniyuki Iwashima <kuniyu@...gle.com>
CC: <davem@...emloft.net>, <dsahern@...nel.org>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <horms@...nel.org>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] ipv4: fib: Remove unnecessary encap_type check

On 2025/6/25 2:26, Kuniyuki Iwashima wrote:
> On Tue, Jun 24, 2025 at 6:46 AM Yue Haibing <yuehaibing@...wei.com> wrote:
>>
>> lwtunnel_build_state() has check validity of encap_type,
>> so no need to do this before call it.
>>
>> Signed-off-by: Yue Haibing <yuehaibing@...wei.com>
>> ---
>>  net/ipv4/fib_semantics.c | 8 --------
>>  1 file changed, 8 deletions(-)
>>
>> diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
>> index f7c9c6a9f53e..475ffcbf4927 100644
>> --- a/net/ipv4/fib_semantics.c
>> +++ b/net/ipv4/fib_semantics.c
>> @@ -625,11 +625,6 @@ int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc,
>>         if (encap) {
>>                 struct lwtunnel_state *lwtstate;
>>
>> -               if (encap_type == LWTUNNEL_ENCAP_NONE) {
>> -                       NL_SET_ERR_MSG(extack, "LWT encap type not specified");
>> -                       err = -EINVAL;
>> -                       goto lwt_failure;
>> -               }
>>                 err = lwtunnel_build_state(net, encap_type, encap,
>>                                            nhc->nhc_family, cfg, &lwtstate,
>>                                            extack);
>> @@ -890,9 +885,6 @@ static int fib_encap_match(struct net *net, u16 encap_type,
>>         struct lwtunnel_state *lwtstate;
>>         int ret, result = 0;
>>
>> -       if (encap_type == LWTUNNEL_ENCAP_NONE)
>> -               return 0;
> 
> Now this condition returns -EINVAL, which confuses fib_encap_match(), no ?

Right, sorry for overlook this, will restore in v2.

> 
> 
>> -
>>         ret = lwtunnel_build_state(net, encap_type, encap, AF_INET,
>>                                    cfg, &lwtstate, extack);
>>         if (!ret) {
>> --
>> 2.34.1
>>
>