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To: Igor Ryzhov <iryzhov@nfware.com>
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From: Ferruh Yigit <ferruh.yigit@intel.com>
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Date: Thu, 24 Jan 2019 14:10:31 +0000
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Subject: Re: [dpdk-dev] [PATCH] kni: implement header_ops parse method
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On 1/24/2019 9:18 AM, Igor Ryzhov wrote:
> Hi Ferruh,
>
> What about this patch?
> Can you merge it as-is, or should I change it to use relevant eth_header_ops
> functions? Or maybe completely use eth_header_ops?
Hi Igor,
I am not clear about motivation of the patch, what use case enabled by this
patch? What is not working with current code?
I am for rejecting the patch without need justified.
And if the need is justified, still there is a question that why not use
'eth_header_parse()' directly but implement our copy?
And an extended question/investigation about why not use 'eth_header_ops', which
seems done intentionally but I am missing the reasoning.
>
> Best regards,
> Igor
>
> On Fri, Nov 30, 2018 at 10:07 PM Igor Ryzhov <iryzhov@nfware.com
> <mailto:iryzhov@nfware.com>> wrote:
>
> Hi Ferruh,
>
> header_ops.parse method is used by raw-sockets to fill sockaddr_ll structure.
> It is used, for example, in isisd for frrouting.
>
> Regarding your question about eth_header_ops – I, unfortunately, don't know
> why .cache and .cache_update are disabled for KNI.
> I also think that it will be better to use default eth_header_ops.
>
> Best regards,
> Igor
>
> On Tue, Oct 2, 2018 at 7:58 PM Ferruh Yigit <ferruh.yigit@intel.com
> <mailto:ferruh.yigit@intel.com>> wrote:
>
> On 9/27/2018 1:02 AM, Igor Ryzhov wrote:
> > Signed-off-by: Igor Ryzhov <iryzhov@nfware.com
> <mailto:iryzhov@nfware.com>>
>
> Hi Igor,
>
> What is the motivation to add this support? What is enabled by this?
>
>
> Meanwhile, why we are not using eth_header_ops, which is already set by
> ether_setup().
> To disable .cache & .cache_update?
>
> If so why not using relevant eth_header_ops (eth_header,
> eth_header_parse ..)
> instead of implementing ours?
>
> > ---
> > kernel/linux/kni/kni_net.c | 14 ++++++++++++++
> > 1 file changed, 14 insertions(+)
> >
> > diff --git a/kernel/linux/kni/kni_net.c b/kernel/linux/kni/kni_net.c
> > index 7fcfa106c..128a5477c 100644
> > --- a/kernel/linux/kni/kni_net.c
> > +++ b/kernel/linux/kni/kni_net.c
> > @@ -678,6 +678,19 @@ kni_net_header(struct sk_buff *skb, struct
> net_device *dev,
> > return dev->hard_header_len;
> > }
> >
> > +/*
> > + * Extract hardware address from packet
> > + */
> > +static int
> > +kni_net_header_parse(const struct sk_buff *skb, unsigned char *haddr)
> > +{
> > + const struct ethhdr *eth = eth_hdr(skb);
> > +
> > + memcpy(haddr, eth->h_source, ETH_ALEN);
> > +
> > + return ETH_ALEN;
> > +}
> > +
> > /*
> > * Re-fill the eth header
> > */
> > @@ -739,6 +752,7 @@ kni_net_change_carrier(struct net_device *dev,
> bool new_carrier)
> >
> > static const struct header_ops kni_net_header_ops = {
> > .create = kni_net_header,
> > + .parse = kni_net_header_parse,
> > #ifdef HAVE_REBUILD_HEADER
> > .rebuild = kni_net_rebuild_header,
> > #endif /* < 4.1.0 */
> >
>