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

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Message-ID: <ad8817bf-50fd-5dee-1540-bae10c55d9f4@huawei.com>
Date:   Tue, 7 Nov 2023 15:45:24 +0800
From:   Yunsheng Lin <linyunsheng@...wei.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>,
        Paolo Abeni <pabeni@...hat.com>,
        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 2023/11/6 10:44, 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))

When gen_pool_has_addr() returns false, does it mean something has gone
really wrong here?

> +		gen_pool_free(binding->chunk_pool,
> +			      page_pool_iov_dma_addr(ppiov), PAGE_SIZE);
> +
> +	netdev_devmem_binding_put(binding);
> +}
> +
>  void netdev_unbind_dmabuf(struct netdev_dmabuf_binding *binding)
>  {
>  	struct netdev_rx_queue *rxq;
>