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

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Message-ID: <20231110151935.0859fd7a@kernel.org>
Date:   Fri, 10 Nov 2023 15:19:35 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Mina Almasry <almasrymina@...gle.com>
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 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.