netdev - Re: [net-next v1 07/16] netdev: netdevice devmem allocator

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Date: Fri, 8 Dec 2023 10:56:39 -0700
From: David Ahern <dsahern@...nel.org>
To: Mina Almasry <almasrymina@...gle.com>,
 Shailend Chand <shailend@...gle.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-arch@...r.kernel.org, linux-kselftest@...r.kernel.org,
 bpf@...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>, Jonathan Corbet <corbet@....net>,
 Jeroen de Borst <jeroendb@...gle.com>,
 Praveen Kaligineedi <pkaligineedi@...gle.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>,
 Yunsheng Lin <linyunsheng@...wei.com>,
 Harshitha Ramamurthy <hramamurthy@...gle.com>,
 Shakeel Butt <shakeelb@...gle.com>, Willem de Bruijn <willemb@...gle.com>,
 Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [net-next v1 07/16] netdev: netdevice devmem allocator

On 12/7/23 5:52 PM, Mina Almasry wrote:
> diff --git a/net/core/dev.c b/net/core/dev.c
> index b8c8be5a912e..30667e4c3b95 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -2120,6 +2120,41 @@ static int netdev_restart_rx_queue(struct net_device *dev, int rxq_idx)
>  	return err;
>  }
>  
> +struct page_pool_iov *netdev_alloc_dmabuf(struct netdev_dmabuf_binding *binding)
> +{
> +	struct dmabuf_genpool_chunk_owner *owner;
> +	struct page_pool_iov *ppiov;
> +	unsigned long dma_addr;
> +	ssize_t offset;
> +	ssize_t index;
> +
> +	dma_addr = gen_pool_alloc_owner(binding->chunk_pool, PAGE_SIZE,

Any reason not to allow allocation sizes other than PAGE_SIZE? e.g.,
2048 for smaller MTUs or 8192 for larger ones. It can be a property of
page_pool and constant across allocations vs allowing different size for
each allocation.