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Message-ID: <fa9f8d25-9f68-4f63-a070-639e23917827@gmail.com>
Date: Mon, 17 Jun 2024 18:52:54 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: Mina Almasry <almasrymina@...gle.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-alpha@...r.kernel.org, linux-mips@...r.kernel.org,
 linux-parisc@...r.kernel.org, sparclinux@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 linux-arch@...r.kernel.org, bpf@...r.kernel.org,
 linux-kselftest@...r.kernel.org, linux-media@...r.kernel.org,
 dri-devel@...ts.freedesktop.org
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Donald Hunter <donald.hunter@...il.com>,
 Jonathan Corbet <corbet@....net>,
 Richard Henderson <richard.henderson@...aro.org>,
 Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner
 <mattst88@...il.com>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 Helge Deller <deller@....de>, Andreas Larsson <andreas@...sler.com>,
 Sergey Shtylyov <s.shtylyov@....ru>, Jesper Dangaard Brouer
 <hawk@...nel.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Arnd Bergmann <arnd@...db.de>, Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
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 <eddyz87@...il.com>, Song Liu <song@...nel.org>,
 Yonghong Song <yonghong.song@...ux.dev>,
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
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 Jiri Olsa <jolsa@...nel.org>, Steffen Klassert
 <steffen.klassert@...unet.com>, Herbert Xu <herbert@...dor.apana.org.au>,
 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>,
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 Nikolay Aleksandrov <razor@...ckwall.org>, David Wei <dw@...idwei.uk>,
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 Harshitha Ramamurthy <hramamurthy@...gle.com>,
 Shakeel Butt <shakeel.butt@...ux.dev>, Jeroen de Borst
 <jeroendb@...gle.com>, Praveen Kaligineedi <pkaligineedi@...gle.com>,
 linux-mm@...ck.org, Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH net-next v12 05/13] page_pool: convert to use netmem

On 6/13/24 02:35, Mina Almasry wrote:
> Abstrace the memory type from the page_pool so we can later add support
> for new memory types. Convert the page_pool to use the new netmem type
> abstraction, rather than use struct page directly.
> 
> As of this patch the netmem type is a no-op abstraction: it's always a
> struct page underneath. All the page pool internals are converted to
> use struct netmem instead of struct page, and the page pool now exports
> 2 APIs:
> 
> 1. The existing struct page API.
> 2. The new struct netmem API.

nits below,

Reviewed-by: Pavel Begunkov <asml.silence@...il.com>


> Keeping the existing API is transitional; we do not want to refactor all
> the current drivers using the page pool at once.
> 
> The netmem abstraction is currently a no-op. The page_pool uses
> page_to_netmem() to convert allocated pages to netmem, and uses
> netmem_to_page() to convert the netmem back to pages to pass to mm APIs,
> 
> Follow up patches to this series add non-paged netmem support to the
> page_pool. This change is factored out on its own to limit the code
> churn to this 1 patch, for ease of code review.
> 
> Signed-off-by: Mina Almasry <almasrymina@...gle.com>
>   #endif /* _NET_NETMEM_H */
> diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h
> index 873631c79ab16..5e129d5304f53 100644
> --- a/include/net/page_pool/helpers.h
> +++ b/include/net/page_pool/helpers.h
> @@ -55,6 +55,8 @@
>   #include <linux/dma-mapping.h>
>   
>   #include <net/page_pool/types.h>
> +#include <net/net_debug.h>
> +#include <net/netmem.h>
>   
>   #ifdef CONFIG_PAGE_POOL_STATS
>   /* Deprecated driver-facing API, use netlink instead */
> @@ -103,7 +105,7 @@ static inline struct page *page_pool_dev_alloc_pages(struct page_pool *pool)
>    * Get a page fragment from the page allocator or page_pool caches.
>    *
>    * Return:
> - * Return allocated page fragment, otherwise return NULL.
> + * Return allocated page fragment, otherwise return 0.

It's a page_pool_dev_alloc_frag()'s comment, and the function
still returns a pointer.

...
>   static inline void *page_pool_alloc_va(struct page_pool *pool,
> @@ -172,7 +174,8 @@ static inline void *page_pool_alloc_va(struct page_pool *pool,
>   	struct page *page;
>   
>   	/* Mask off __GFP_HIGHMEM to ensure we can use page_address() */
> -	page = page_pool_alloc(pool, &offset, size, gfp & ~__GFP_HIGHMEM);
> +	page = netmem_to_page(
> +		page_pool_alloc(pool, &offset, size, gfp & ~__GFP_HIGHMEM));
>   	if (unlikely(!page))
>   		return NULL;
>   
> @@ -189,7 +192,7 @@ static inline void *page_pool_alloc_va(struct page_pool *pool,
>    * it returns va of the allocated page or page fragment.
>    *
>    * Return:
> - * Return the va for the allocated page or page fragment, otherwise return NULL.
> + * Return the va for the allocated page or page fragment, otherwise return 0.

ditto

>    */
>   static inline void *page_pool_dev_alloc_va(struct page_pool *pool,
>   					   unsigned int *size)
> @@ -212,6 +215,11 @@ page_pool_get_dma_dir(const struct page_pool *pool)
>   	return pool->p.dma_dir;
>   }
>   
> +static inline void page_pool_fragment_netmem(netmem_ref netmem, long nr)
> +{
> +	atomic_long_set(&netmem_to_page(netmem)->pp_ref_count, nr);
> +}
...

-- 
Pavel Begunkov

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