[RFC PATCH net] ipv6/ila: fix nlsize calculation for lwtunnel

[RFC PATCH net] ipv6/ila: fix nlsize calculation for lwtunnel

[Nicolas Dichtel]

The handler 'ila_fill_encap_info' adds one attribute: ILA_ATTR_LOCATOR.

Fixes: 65d7ab8de582 ("net: Identifier Locator Addressing module")
CC: Tom Herbert <tom@herbertland.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
---

Tom, when I read the comment, I feel I'm misssing something, but what?

 net/ipv6/ila/ila_lwt.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c
index 2ae3c4fd8aab..41f18de5dcc2 100644
--- a/net/ipv6/ila/ila_lwt.c
+++ b/net/ipv6/ila/ila_lwt.c
@@ -120,8 +120,7 @@ nla_put_failure:
 
 static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
 {
-	/* No encapsulation overhead */
-	return 0;
+	return nla_total_size(sizeof(u64)); /* ILA_ATTR_LOCATOR */
 }
 
 static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
-- 
2.8.1

Re: [RFC PATCH net] ipv6/ila: fix nlsize calculation for lwtunnel

[David Miller]

From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Date: Fri, 22 Apr 2016 17:58:02 +0200

> The handler 'ila_fill_encap_info' adds one attribute: ILA_ATTR_LOCATOR.
> 
> Fixes: 65d7ab8de582 ("net: Identifier Locator Addressing module")
> CC: Tom Herbert <tom@herbertland.com>
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
> ---
> 
> Tom, when I read the comment, I feel I'm misssing something, but what?

Tom please take a look at this, thanks.

Re: [RFC PATCH net] ipv6/ila: fix nlsize calculation for lwtunnel

[David Miller]

From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Date: Fri, 22 Apr 2016 17:58:02 +0200

> The handler 'ila_fill_encap_info' adds one attribute: ILA_ATTR_LOCATOR.
> 
> Fixes: 65d7ab8de582 ("net: Identifier Locator Addressing module")
> CC: Tom Herbert <tom@herbertland.com>
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
> ---
> 
> Tom, when I read the comment, I feel I'm misssing something, but what?

Tom, seriously, please look at this.

And with recent changes in net-next the csum attribute size needs to
be specified as well, plus the locator needs to use the 64-bit
alignment sizing helper.

Re: [RFC PATCH net] ipv6/ila: fix nlsize calculation for lwtunnel

[Tom Herbert]

On Wed, Apr 27, 2016 at 12:20 PM, David Miller <davem@davemloft.net> wrote:
> From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
> Date: Fri, 22 Apr 2016 17:58:02 +0200
>
>> The handler 'ila_fill_encap_info' adds one attribute: ILA_ATTR_LOCATOR.
>>
>> Fixes: 65d7ab8de582 ("net: Identifier Locator Addressing module")
>> CC: Tom Herbert <tom@herbertland.com>
>> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
>> ---
>>
>> Tom, when I read the comment, I feel I'm misssing something, but what?
>
> Tom, seriously, please look at this.
>
Yes, it is an issue. Need to do add size for ILA_ATTR_LOCATOR and
ILA_ATTR_CSUM_MODE. Also not we made ILA_ATTR_CSUM_MODE u64 in fill
encap info. I will send a path shortly.

> And with recent changes in net-next the csum attribute size needs to
> be specified as well, plus the locator needs to use the 64-bit
> alignment sizing helper.

Something other than nla_put_u64_64bit?

Thanks,
Tom

Re: [RFC PATCH net] ipv6/ila: fix nlsize calculation for lwtunnel

[David Miller]

From: Tom Herbert <tom@herbertland.com>
Date: Thu, 28 Apr 2016 09:07:25 -0700

> On Wed, Apr 27, 2016 at 12:20 PM, David Miller <davem@davemloft.net> wrote:
>> From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
>> Date: Fri, 22 Apr 2016 17:58:02 +0200
>>
>>> The handler 'ila_fill_encap_info' adds one attribute: ILA_ATTR_LOCATOR.
>>>
>>> Fixes: 65d7ab8de582 ("net: Identifier Locator Addressing module")
>>> CC: Tom Herbert <tom@herbertland.com>
>>> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
>>> ---
>>>
>>> Tom, when I read the comment, I feel I'm misssing something, but what?
>>
>> Tom, seriously, please look at this.
>>
> Yes, it is an issue. Need to do add size for ILA_ATTR_LOCATOR and
> ILA_ATTR_CSUM_MODE. Also not we made ILA_ATTR_CSUM_MODE u64 in fill
> encap info. I will send a path shortly.
> 
>> And with recent changes in net-next the csum attribute size needs to
>> be specified as well, plus the locator needs to use the 64-bit
>> alignment sizing helper.
> 
> Something other than nla_put_u64_64bit?

That's what it should use, yes.

Re: [RFC PATCH net] ipv6/ila: fix nlsize calculation for lwtunnel

[Nicolas Dichtel]

Le 28/04/2016 18:07, Tom Herbert a écrit :
> On Wed, Apr 27, 2016 at 12:20 PM, David Miller <davem@davemloft.net> wrote:
>> From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
>> Date: Fri, 22 Apr 2016 17:58:02 +0200
>>
>>> The handler 'ila_fill_encap_info' adds one attribute: ILA_ATTR_LOCATOR.
>>>
>>> Fixes: 65d7ab8de582 ("net: Identifier Locator Addressing module")
>>> CC: Tom Herbert <tom@herbertland.com>
>>> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
>>> ---
>>>
>>> Tom, when I read the comment, I feel I'm misssing something, but what?
>>
>> Tom, seriously, please look at this.
>>
> Yes, it is an issue. Need to do add size for ILA_ATTR_LOCATOR and
> ILA_ATTR_CSUM_MODE. Also not we made ILA_ATTR_CSUM_MODE u64 in fill
> encap info. I will send a path shortly.
David, I saw that you didn't apply this patch. Note that Tom's patch is
for net-next while this one is for net.
I think that both patches are needed (and they will conflict after the next merge).


Regards,
Nicolas

[PATCH net v1] ipv6/ila: fix nlsize calculation for lwtunnel

[Nicolas Dichtel]

The handler 'ila_fill_encap_info' adds one attribute: ILA_ATTR_LOCATOR.

Fixes: 65d7ab8de582 ("net: Identifier Locator Addressing module")
CC: Tom Herbert <tom@herbertland.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
---

RFC -> v1:
  - rebase on last net tree

 net/ipv6/ila/ila_lwt.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c
index 2ae3c4fd8aab..41f18de5dcc2 100644
--- a/net/ipv6/ila/ila_lwt.c
+++ b/net/ipv6/ila/ila_lwt.c
@@ -120,8 +120,7 @@ nla_put_failure:
 
 static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
 {
-	/* No encapsulation overhead */
-	return 0;
+	return nla_total_size(sizeof(u64)); /* ILA_ATTR_LOCATOR */
 }
 
 static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
-- 
2.8.1

Re: [PATCH net v1] ipv6/ila: fix nlsize calculation for lwtunnel

[David Miller]

From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Date: Tue,  3 May 2016 09:58:27 +0200

> The handler 'ila_fill_encap_info' adds one attribute: ILA_ATTR_LOCATOR.
> 
> Fixes: 65d7ab8de582 ("net: Identifier Locator Addressing module")
> CC: Tom Herbert <tom@herbertland.com>
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
> ---
> 
> RFC -> v1:
>   - rebase on last net tree

Applied and queued up for -stable, thanks for reposting this Nicolas.