linux-kernel - Re: [RFC PATCH net-next v1 2/4] net: introduce abstraction for network memory

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Date:   Wed, 13 Dec 2023 22:34:43 -0800
From:   David Ahern <dsahern@...nel.org>
To:     Mina Almasry <almasrymina@...gle.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Michael Chan <michael.chan@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
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        Wei Fang <wei.fang@....com>,
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        NXP Linux Team <linux-imx@....com>,
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        Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: Re: [RFC PATCH net-next v1 2/4] net: introduce abstraction for
 network memory

On 12/13/23 7:05 PM, Mina Almasry wrote:
> diff --git a/include/net/netmem.h b/include/net/netmem.h
> new file mode 100644
> index 000000000000..e4309242d8be
> --- /dev/null
> +++ b/include/net/netmem.h
> @@ -0,0 +1,35 @@
> +/* SPDX-License-Identifier: GPL-2.0
> + *
> + * netmem.h
> + *	Author:	Mina Almasry <almasrymina@...gle.com>
> + *	Copyright (C) 2023 Google LLC
> + */
> +
> +#ifndef _NET_NETMEM_H
> +#define _NET_NETMEM_H
> +
> +struct netmem {
> +	union {
> +		struct page page;
> +
> +		/* Stub to prevent compiler implicitly converting from page*
> +		 * to netmem_t* and vice versa.
> +		 *
> +		 * Other memory type(s) net stack would like to support
> +		 * can be added to this union.
> +		 */
> +		void *addr;
> +	};
> +};
> +
> +static inline struct page *netmem_to_page(struct netmem *netmem)
> +{
> +	return &netmem->page;
> +}
> +
> +static inline struct netmem *page_to_netmem(struct page *page)
> +{
> +	return (struct netmem *)page;

container_of; no typecasts.


> +}
> +
> +#endif /* _NET_NETMEM_H */