netdev - Re: [PATCH net-next v15 03/14] netdev: support binding dma-buf to netdevice

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Date: Tue, 02 Jul 2024 13:08:11 +0200
From: Paolo Abeni <pabeni@...hat.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-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>, 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>, 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
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 Lau <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>, Song Liu
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 Herbert Xu <herbert@...dor.apana.org.au>, David Ahern <dsahern@...nel.org>,
 Willem de Bruijn <willemdebruijn.kernel@...il.com>,  Shuah Khan
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 Aleksandrov <razor@...ckwall.org>, Pavel Begunkov <asml.silence@...il.com>,
 David Wei <dw@...idwei.uk>, Jason Gunthorpe <jgg@...pe.ca>, Yunsheng Lin
 <linyunsheng@...wei.com>, Shailend Chand <shailend@...gle.com>, Harshitha
 Ramamurthy <hramamurthy@...gle.com>,  Shakeel Butt
 <shakeel.butt@...ux.dev>, Jeroen de Borst <jeroendb@...gle.com>, Praveen
 Kaligineedi <pkaligineedi@...gle.com>, Willem de Bruijn
 <willemb@...gle.com>, Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [PATCH net-next v15 03/14] netdev: support binding dma-buf to
 netdevice

On Fri, 2024-06-28 at 00:32 +0000, Mina Almasry wrote:
> +int net_devmem_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd,
> +			   struct net_devmem_dmabuf_binding **out)
> +{
> +	struct net_devmem_dmabuf_binding *binding;
> +	static u32 id_alloc_next;
> +	struct scatterlist *sg;
> +	struct dma_buf *dmabuf;
> +	unsigned int sg_idx, i;
> +	unsigned long virtual;
> +	int err;
> +
> +	dmabuf = dma_buf_get(dmabuf_fd);
> +	if (IS_ERR(dmabuf))
> +		return -EBADFD;
> +
> +	binding = kzalloc_node(sizeof(*binding), GFP_KERNEL,
> +			       dev_to_node(&dev->dev));
> +	if (!binding) {
> +		err = -ENOMEM;
> +		goto err_put_dmabuf;
> +	}
> +
> +	binding->dev = dev;
> +
> +	err = xa_alloc_cyclic(&net_devmem_dmabuf_bindings, &binding->id,
> +			      binding, xa_limit_32b, &id_alloc_next,
> +			      GFP_KERNEL);
> +	if (err < 0)
> +		goto err_free_binding;
> +
> +	xa_init_flags(&binding->bound_rxq_list, XA_FLAGS_ALLOC);
> +
> +	refcount_set(&binding->ref, 1);
> +
> +	binding->dmabuf = dmabuf;
> +
> +	binding->attachment = dma_buf_attach(binding->dmabuf, dev->dev.parent);
> +	if (IS_ERR(binding->attachment)) {
> +		err = PTR_ERR(binding->attachment);
> +		goto err_free_id;
> +	}
> +
> +	binding->sgt =
> +		dma_buf_map_attachment(binding->attachment, DMA_FROM_DEVICE);
> +	if (IS_ERR(binding->sgt)) {
> +		err = PTR_ERR(binding->sgt);
> +		goto err_detach;
> +	}
> +
> +	/* For simplicity we expect to make PAGE_SIZE allocations, but the
> +	 * binding can be much more flexible than that. We may be able to
> +	 * allocate MTU sized chunks here. Leave that for future work...
> +	 */
> +	binding->chunk_pool =
> +		gen_pool_create(PAGE_SHIFT, dev_to_node(&dev->dev));
> +	if (!binding->chunk_pool) {
> +		err = -ENOMEM;
> +		goto err_unmap;
> +	}
> +
> +	virtual = 0;
> +	for_each_sgtable_dma_sg(binding->sgt, sg, sg_idx) {
> +		dma_addr_t dma_addr = sg_dma_address(sg);
> +		struct dmabuf_genpool_chunk_owner *owner;
> +		size_t len = sg_dma_len(sg);
> +		struct net_iov *niov;
> +
> +		owner = kzalloc_node(sizeof(*owner), GFP_KERNEL,
> +				     dev_to_node(&dev->dev));

I'm sorry for not catching this earlier, but it looks like the above
allocation lacks a NULL check.

Thanks,

Paolo