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Message-ID: <462da4bf-34f8-40c4-8772-9850b3127baf@kernel.org>
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.
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