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

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Message-ID: <21e4ef7d4a1b4ad298b0688f2b9ce8f5572e1e69.camel@redhat.com>
Date: Thu, 09 Nov 2023 09:44:18 +0100
From: Paolo Abeni <pabeni@...hat.com>
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>, 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>,
 Willem de Bruijn <willemb@...gle.com>, Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [RFC PATCH v3 05/12] netdev: netdevice devmem allocator

On Sun, 2023-11-05 at 18:44 -0800, Mina Almasry wrote:
[...]
> +void netdev_free_devmem(struct page_pool_iov *ppiov)
> +{
> +	struct netdev_dmabuf_binding *binding = page_pool_iov_binding(ppiov);
> +
> +	refcount_set(&ppiov->refcount, 1);
> +
> +	if (gen_pool_has_addr(binding->chunk_pool,
> +			      page_pool_iov_dma_addr(ppiov), PAGE_SIZE))
> +		gen_pool_free(binding->chunk_pool,
> +			      page_pool_iov_dma_addr(ppiov), PAGE_SIZE);

Minor nit: what about caching the dma_addr value to make the above more
readable?

Cheers,

Paolo