linux-kernel - Re: [RFC PATCH v3 06/12] memory-provider: dmabuf devmem memory provider

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Message-ID: <20231110151622.2f45f618@kernel.org>
Date:   Fri, 10 Nov 2023 15:16:22 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Mina Almasry <almasrymina@...gle.com>
Cc:     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,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        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 06/12] memory-provider: dmabuf devmem memory
 provider

On Sun,  5 Nov 2023 18:44:05 -0800 Mina Almasry wrote:
> +static int mp_dmabuf_devmem_init(struct page_pool *pool)
> +{
> +	struct netdev_dmabuf_binding *binding = pool->mp_priv;
> +
> +	if (!binding)
> +		return -EINVAL;
> +
> +	if (pool->p.flags & PP_FLAG_DMA_MAP ||
> +	    pool->p.flags & PP_FLAG_DMA_SYNC_DEV)
> +		return -EOPNOTSUPP;

This looks backwards, we should _force_ the driver to use the dma
mapping built into the page pool APIs, to isolate the driver from
how the DMA addr actually gets obtained. Right?

Maybe seeing driver patches would illuminate.