linux-kernel - Re: [RFC PATCH v3 08/12] net: support non paged skb frags

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Message-ID: <CAHS8izN7MydkJPaHfj7Pw0V+xoDBkCmEVTc1TH24=hjXm98xnQ@mail.gmail.com>
Date:   Sun, 12 Nov 2023 22:05:30 -0800
From:   Mina Almasry <almasrymina@...gle.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        David Ahern <dsahern@...nel.org>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Jeroen de Borst <jeroendb@...gle.com>,
        Praveen Kaligineedi <pkaligineedi@...gle.com>
Subject: Re: [RFC PATCH v3 08/12] net: support non paged skb frags

On Fri, Nov 10, 2023 at 3:19 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Sun,  5 Nov 2023 18:44:07 -0800 Mina Almasry wrote:
> >  #include <net/net_debug.h>
> >  #include <net/dropreason-core.h>
> > +#include <net/page_pool/types.h>
> > +#include <net/page_pool/helpers.h>
>
> >  /**
> >   * DOC: skb checksums
> > @@ -3402,15 +3404,38 @@ static inline void skb_frag_off_copy(skb_frag_t *fragto,
> >       fragto->bv_offset = fragfrom->bv_offset;
> >  }
> >
> > +/* Returns true if the skb_frag contains a page_pool_iov. */
> > +static inline bool skb_frag_is_page_pool_iov(const skb_frag_t *frag)
> > +{
> > +     return page_is_page_pool_iov(frag->bv_page);
> > +}
>
> Maybe we can create a new header? For skb + page pool.
>
> skbuff.h is included by 1/4th of the kernel objects, we should not
> be adding dependencies to this header, it really slows down incremental
> builds.
>

My issue here is that all these skb helpers call each other so I end
up having to move a lot of the unrelated skb helpers to this new
header (maybe that is acceptable but it feels weird).

What I could do here is move all the page_pool_page|iov_* helpers to a
minimal header, and include only that one from skbuff.h, rather than
including all of net/page_pool/helpers.h

-- 
Thanks,
Mina