netdev - Re: [PATCH v2 net-next 5/5] net: Add GRE keyid in flow

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Date:	Tue, 12 May 2015 10:51:55 -0400
From:	Tom Herbert <tom@...bertland.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net-next 5/5] net: Add GRE keyid in flow_keys

On Tue, May 12, 2015 at 12:50 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Mon, 2015-05-11 at 21:33 -0700, Eric Dumazet wrote:
>> On Mon, 2015-05-11 at 20:26 -0700, Tom Herbert wrote:
>> > In flow dissector if a GRE header contains a keyid this is saved in the
>> > new extra entropy field of flow_keys. The GRE keyid is then represented
>> > in the flow hash function input.
>> >
>> > Signed-off-by: Tom Herbert <tom@...bertland.com>
>> > ---
>> >  include/net/flow_keys.h   |  1 +
>> >  net/core/flow_dissector.c | 15 ++++++++++++++-
>> >  2 files changed, 15 insertions(+), 1 deletion(-)
>> >
>> > diff --git a/include/net/flow_keys.h b/include/net/flow_keys.h
>> > index 906d47a..779e42f 100644
>> > --- a/include/net/flow_keys.h
>> > +++ b/include/net/flow_keys.h
>> > @@ -28,6 +28,7 @@ struct flow_keys {
>> >     u8      padding;
>> >     u32     vlan_id:12,
>> >             flow_label:20;
>> > +   u32     extra_entropy;
>> >
>> >     union {
>> >             __be32 ports;
>> > diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
>> > index de71e42..025b91f 100644
>> > --- a/net/core/flow_dissector.c
>> > +++ b/net/core/flow_dissector.c
>> > @@ -195,8 +195,21 @@ ipv6:
>> >                     nhoff += 4;
>> >                     if (hdr->flags & GRE_CSUM)
>> >                             nhoff += 4;
>> > -                   if (hdr->flags & GRE_KEY)
>> > +                   if (hdr->flags & GRE_KEY) {
>> > +                           const __be32 *keyid;
>> > +                           __be32 _keyid;
>> > +
>> > +                           keyid = __skb_header_pointer(skb, nhoff,
>> > +                                                        sizeof(_keyid),
>> > +                                                        data, hlen,
>> > +                                                        &_keyid);
>> > +                           if (!keyid)
>> > +                                   return false;
>> > +
>> > +                           flow->extra_entropy ^= *keyid;
>>
>>
>> This probably should not please sparse ?
>>
>> make C=2 CF=-D__CHECK_ENDIAN__  net/core/flow_dissector.o
>>
>
> BTW, you never addressed prior feedback about sparse errors :
>
> include/linux/skbuff.h:3054:24: warning: incorrect type in return expression (different base types)
> include/linux/skbuff.h:3054:24:    expected restricted __sum16
> include/linux/skbuff.h:3054:24:    got int
> include/linux/skbuff.h:3054:24: warning: incorrect type in return expression (different base types)
> include/linux/skbuff.h:3054:24:    expected restricted __sum16
> include/linux/skbuff.h:3054:24:    got int
> include/linux/skbuff.h:3362:14: warning: incorrect type in assignment (different base types)
> include/linux/skbuff.h:3362:14:    expected unsigned short [unsigned] [usertype] csum
> include/linux/skbuff.h:3362:14:    got restricted __sum16
> include/linux/skbuff.h:3367:16: warning: incorrect type in return expression (different base types)
> include/linux/skbuff.h:3367:16:    expected restricted __sum16
> include/linux/skbuff.h:3367:16:    got unsigned short [unsigned] [usertype] csum
>
> commit 7e2b10c1e52ca37f ("net: Support for multiple checksums with gso")
>
Hi Eric,

I don't see these errors with sparse. How are you running it?

Thanks,
Tom

> Thanks
>
>
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