netdev - Re: [RFC PATCH net-next v6 02/15] net: page_pool: create hooks for custom page providers

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Message-ID: <1b57dac2-4b04-4bec-b2d7-d0edb4fcabbc@davidwei.uk>
Date: Tue, 5 Mar 2024 13:54:59 -0800
From: David Wei <dw@...idwei.uk>
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,
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 bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
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Subject: Re: [RFC PATCH net-next v6 02/15] net: page_pool: create hooks for
 custom page providers

On 2024-03-04 18:01, Mina Almasry wrote:
> +struct memory_provider_ops {
> +	int (*init)(struct page_pool *pool);
> +	void (*destroy)(struct page_pool *pool);
> +	struct page *(*alloc_pages)(struct page_pool *pool, gfp_t gfp);
> +	bool (*release_page)(struct page_pool *pool, struct page *page);

For ZC Rx we added a scrub() function to memory_provider_ops that is
called from page_pool_scrub(). Does TCP devmem not custom behaviour
waiting for all netmem_refs to return before destroying the page pool?
What happens if e.g. application crashes?