netdev - Re: [RFC PATCH v2] net: esp: fix bad handling of pages from page

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Message-ID: <20240306195359.1afb26d2@kernel.org>
Date: Wed, 6 Mar 2024 19:53:59 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Dragos Tatulea <dtatulea@...dia.com>
Cc: "davem@...emloft.net" <davem@...emloft.net>,
 "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
 "dsahern@...nel.org" <dsahern@...nel.org>, "steffen.klassert@...unet.com"
 <steffen.klassert@...unet.com>, "pabeni@...hat.com" <pabeni@...hat.com>,
 "edumazet@...gle.com" <edumazet@...gle.com>, "almasrymina@...gle.com"
 <almasrymina@...gle.com>, Leon Romanovsky <leonro@...dia.com>, Gal Pressman
 <gal@...dia.com>, "Anatoli.Chechelnickiy@...nterpipe.biz"
 <Anatoli.Chechelnickiy@...nterpipe.biz>, "ian.kumlien@...il.com"
 <ian.kumlien@...il.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2] net: esp: fix bad handling of pages from
 page_pool

On Wed, 6 Mar 2024 19:09:58 +0000 Dragos Tatulea wrote:
> > Changes in v2:
> > - Added napi_page_unref api based on discussion in v1 [0].
> > 
> > [0]https://lore.kernel.org/netdev/CAHS8izOoO-EovwMwAm9tLYetwikNPxC0FKyVGu1TPJWSz4bGoA@mail.gmail.com/T/#t
> >   
> Jakub, are you sure that it is ok to have all this in a single patch?

Yup.

> > ---
> >  include/linux/skbuff.h | 10 +++++++---
> >  net/ipv4/esp4.c        | 16 ++++++++++------
> >  net/ipv6/esp6.c        | 16 ++++++++++------
> >  3 files changed, 27 insertions(+), 15 deletions(-)
> > 
> > diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> > index 696e7680656f..009603db2a43 100644
> > --- a/include/linux/skbuff.h
> > +++ b/include/linux/skbuff.h
> > @@ -3453,10 +3453,8 @@ int skb_cow_data_for_xdp(struct page_pool *pool, struct sk_buff **pskb,
> >  bool napi_pp_put_page(struct page *page, bool napi_safe);
> >  
> >  static inline void
> > -napi_frag_unref(skb_frag_t *frag, bool recycle, bool napi_safe)
> > +napi_page_unref(struct page *page, bool recycle, bool napi_safe)

I'd call it skb_page_unref()

The napi_ prefix will just confuse people, because we don't have to be
in NAPI context at all when calling this. As long as "napi_safe" is
correctly set to false.  So let's use skb_ as the prefix.

And I'd pass skb to this, not "bool recycle" so that the caller doesn't
have to know the weird details..