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Message-ID: <20240226205746.GK13129@kernel.org>
Date: Mon, 26 Feb 2024 20:57:46 +0000
From: Simon Horman <horms@...nel.org>
To: Christian Hopps <chopps@...n.net>
Cc: Christian Hopps <chopps@...pps.org>, devel@...ux-ipsec.org,
Steffen Klassert <steffen.klassert@...unet.com>,
netdev@...r.kernel.org
Subject: Re: [PATCH ipsec-next v1 8/8] iptfs: impl: add new iptfs xfrm mode
impl
On Thu, Feb 22, 2024 at 03:23:36PM -0500, Christian Hopps wrote:
>
> Simon Horman <horms@...nel.org> writes:
>
> > On Mon, Feb 19, 2024 at 03:57:35AM -0500, Christian Hopps wrote:
> > > From: Christian Hopps <chopps@...n.net>
> > >
> > > Add a new xfrm mode implementing AggFrag/IP-TFS from RFC9347.
> > >
> > > This utilizes the new xfrm_mode_cbs to implement demand-driven IP-TFS
> > > functionality. This functionality can be used to increase bandwidth
> > > utilization through small packet aggregation, as well as help solve PMTU
> > > issues through it's efficient use of fragmentation.
> > >
> > > Link: https://www.rfc-editor.org/rfc/rfc9347.txt
> > >
> > > Signed-off-by: Christian Hopps <chopps@...n.net>
> >
> > ...
> >
> > > diff --git a/net/xfrm/xfrm_iptfs.c b/net/xfrm/xfrm_iptfs.c
> >
> > ...
> >
> > > +/**
> > > + * skb_head_to_frag() - initialize a skb_frag_t based on skb head data
> > > + * @skb: skb with the head data
> > > + * @frag: frag to initialize
> > > + */
> > > +static void skb_head_to_frag(const struct sk_buff *skb, skb_frag_t *frag)
> > > +{
> > > + struct page *page = virt_to_head_page(skb->data);
> > > + unsigned char *addr = (unsigned char *)page_address(page);
> > > +
> > > + BUG_ON(!skb->head_frag);
> >
> > Is it strictly necessary to crash the Kernel here?
> > Likewise, many other places in this patch.
>
> In all use cases it represents a programming error (bug) if the condition is met.
>
> What is the correct use of BUG_ON?
Hi Christian,
I would say that BUG_ON should used in situations where
there is an unrecoverable error to the extent where
the entire system cannot continue to function.
...
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