netdev - Re: [RFC PATCH v3 05/12] netdev: netdevice devmem allocator

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Date: Mon, 6 Nov 2023 16:44:44 -0700
From: David Ahern <dsahern@...nel.org>
To: Mina Almasry <almasrymina@...gle.com>, 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
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Jesper Dangaard Brouer <hawk@...nel.org>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>, Arnd Bergmann
 <arnd@...db.de>, 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>,
 Willem de Bruijn <willemb@...gle.com>, Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [RFC PATCH v3 05/12] netdev: netdevice devmem allocator

On 11/5/23 7:44 PM, Mina Almasry wrote:
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index eeeda849115c..1c351c138a5b 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -843,6 +843,9 @@ struct netdev_dmabuf_binding {
>  };
>  
>  #ifdef CONFIG_DMA_SHARED_BUFFER
> +struct page_pool_iov *
> +netdev_alloc_devmem(struct netdev_dmabuf_binding *binding);
> +void netdev_free_devmem(struct page_pool_iov *ppiov);

netdev_{alloc,free}_dmabuf?

I say that because a dmabuf can be host memory, at least I am not aware
of a restriction that a dmabuf is device memory.