netdev - Re: [PATCH v2 02/17] psp: base PSP device support

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Message-ID: <685c8c553072b_2a5da429429@willemb.c.googlers.com.notmuch>
Date: Wed, 25 Jun 2025 19:55:01 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Daniel Zahka <daniel.zahka@...il.com>, 
 Donald Hunter <donald.hunter@...il.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, 
 Jonathan Corbet <corbet@....net>, 
 Andrew Lunn <andrew+netdev@...n.ch>
Cc: Saeed Mahameed <saeedm@...dia.com>, 
 Leon Romanovsky <leon@...nel.org>, 
 Tariq Toukan <tariqt@...dia.com>, 
 Boris Pismenny <borisp@...dia.com>, 
 Kuniyuki Iwashima <kuniyu@...gle.com>, 
 Willem de Bruijn <willemb@...gle.com>, 
 David Ahern <dsahern@...nel.org>, 
 Neal Cardwell <ncardwell@...gle.com>, 
 Patrisious Haddad <phaddad@...dia.com>, 
 Raed Salem <raeds@...dia.com>, 
 Jianbo Liu <jianbol@...dia.com>, 
 Dragos Tatulea <dtatulea@...dia.com>, 
 Rahul Rameshbabu <rrameshbabu@...dia.com>, 
 Stanislav Fomichev <sdf@...ichev.me>, 
 Toke Høiland-Jørgensen <toke@...hat.com>, 
 Alexander Lobakin <aleksander.lobakin@...el.com>, 
 Jacob Keller <jacob.e.keller@...el.com>, 
 netdev@...r.kernel.org
Subject: Re: [PATCH v2 02/17] psp: base PSP device support

Daniel Zahka wrote:
> From: Jakub Kicinski <kuba@...nel.org>
> 
> Add a netlink family for PSP and allow drivers to register support.
> 
> The "PSP device" is its own object. This allows us to perform more
> flexible reference counting / lifetime control than if PSP information
> was part of net_device. In the future we should also be able
> to "delegate" PSP access to software devices, such as *vlan, veth
> or netkit more easily.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: Daniel Zahka <daniel.zahka@...il.com>

> diff --git a/include/net/psp/types.h b/include/net/psp/types.h
> new file mode 100644
> index 000000000000..dbc5423a53df
> --- /dev/null
> +++ b/include/net/psp/types.h
> @@ -0,0 +1,102 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#ifndef __NET_PSP_H
> +#define __NET_PSP_H
> +
> +#include <linux/mutex.h>
> +#include <linux/refcount.h>
> +
> +struct netlink_ext_ack;
> +
> +#define PSP_DEFAULT_UDP_PORT	1000
> +
> +struct psphdr {
> +	u8	nexthdr;
> +	u8	hdrlen;
> +	u8	crypt_offset;
> +	u8	verfl;
> +	__be32	spi;
> +	__be64	iv;
> +	__be64	vc[]; /* optional */
> +};
> +
> +#define PSP_SPI_KEY_ID		GENMASK(30, 0)
> +#define PSP_SPI_KEY_PHASE	BIT(31)
> +
> +#define PSPHDR_CRYPT_OFFSET	GENMASK(5, 0)
> +
> +#define PSPHDR_VERFL_SAMPLE	BIT(7)
> +#define PSPHDR_VERFL_DROP	BIT(6)
> +#define PSPHDR_VERFL_VERSION	GENMASK(5, 2)
> +#define PSPHDR_VERFL_VIRT	BIT(1)
> +#define PSPHDR_VERFL_ONE	BIT(0)

Use bitfields in struct psphdr rather than manual bit twiddling?

Or else just consider just calling it flags rather than verfl
(which stands for version and flags?).

> +
> +/**
> + * struct psp_dev_config - PSP device configuration
> + * @versions: PSP versions enabled on the device
> + */
> +struct psp_dev_config {
> +	u32 versions;
> +};
> +
> +/**
> + * struct psp_dev - PSP device struct
> + * @main_netdev: original netdevice of this PSP device

This makes sense with a single physical device plus optional virtual
(vlan, bonding, ..) devices.

It may also be possible for a single physical device (with single
device key) to present multiple PFs and/or VFs. In that case, will
there be multiple struct psp_dev, or will one PF be the "main".