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Date: Sat, 9 Dec 2023 17:02:41 +0000
From: Simon Horman <horms@...nel.org>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com,
Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
Russell King <linux@...linux.org.uk>,
linux-arm-kernel@...ts.infradead.org,
Christophe Leroy <christophe.leroy@...roup.eu>,
Herve Codina <herve.codina@...tlin.com>,
Florian Fainelli <f.fainelli@...il.com>,
Heiner Kallweit <hkallweit1@...il.com>,
Vladimir Oltean <vladimir.oltean@....com>,
Köry Maincent <kory.maincent@...tlin.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Jonathan Corbet <corbet@....net>,
Marek Behún <kabel@...nel.org>,
Piergiorgio Beruto <piergiorgio.beruto@...il.com>,
Oleksij Rempel <o.rempel@...gutronix.de>,
Nicolò Veronese <nicveronese@...il.com>
Subject: Re: [RFC PATCH net-next v3 01/13] net: phy: Introduce ethernet link
topology representation
On Fri, Dec 01, 2023 at 05:36:51PM +0100, Maxime Chevallier wrote:
> Link topologies containing multiple network PHYs attached to the same
> net_device can be found when using a PHY as a media converter for use
> with an SFP connector, on which an SFP transceiver containing a PHY can
> be used.
>
> With the current model, the transceiver's PHY can't be used for
> operations such as cable testing, timestamping, macsec offload, etc.
>
> The reason being that most of the logic for these configuration, coming
> from either ethtool netlink or ioctls tend to use netdev->phydev, which
> in multi-phy systems will reference the PHY closest to the MAC.
>
> Introduce a numbering scheme allowing to enumerate PHY devices that
> belong to any netdev, which can in turn allow userspace to take more
> precise decisions with regard to each PHY's configuration.
>
> The numbering is maintained per-netdev, in a phy_device_list.
> The numbering works similarly to a netdevice's ifindex, with
> identifiers that are only recycled once INT_MAX has been reached.
>
> This prevents races that could occur between PHY listing and SFP
> transceiver removal/insertion.
>
> The identifiers are assigned at phy_attach time, as the numbering
> depends on the netdevice the phy is attached to.
>
> Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
Hi Maxime,
some minor feedback from my side.
...
> diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
> index f65e85c91fc1..3cf7774df57e 100644
> --- a/drivers/net/phy/Makefile
> +++ b/drivers/net/phy/Makefile
> @@ -2,7 +2,7 @@
> # Makefile for Linux PHY drivers
>
> libphy-y := phy.o phy-c45.o phy-core.o phy_device.o \
> - linkmode.o
> + linkmode.o phy_link_topology.o
> mdio-bus-y += mdio_bus.o mdio_device.o
>
> ifdef CONFIG_MDIO_DEVICE
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
...
> @@ -265,6 +266,14 @@ static void phy_mdio_device_remove(struct mdio_device *mdiodev)
>
> static struct phy_driver genphy_driver;
>
> +static struct phy_link_topology *phy_get_link_topology(struct phy_device *phydev)
> +{
> + if (phydev->attached_dev)
> + return &phydev->attached_dev->link_topo;
> +
> + return NULL;
> +}
> +
This function is declared static but is unused, which causes
allmodconfig W=1 builds to fail. Perhaps it could be introduced
in a latter patch where it is used?
...
> diff --git a/drivers/net/phy/phy_link_topology.c b/drivers/net/phy/phy_link_topology.c
...
> +void phy_link_topo_init(struct phy_link_topology *topo)
> +{
> + xa_init_flags(&topo->phys, XA_FLAGS_ALLOC1);
> + topo->next_phy_index = 1;
> +}
...
> diff --git a/include/linux/phy_link_topology.h b/include/linux/phy_link_topology.h
...
> +#else
> +static struct phy_device *phy_link_topo_get_phy(struct phy_link_topology *topo,
> + u32 phyindex)
> +{
> + return NULL;
> +}
> +
> +static int phy_link_topo_add_phy(struct phy_link_topology *topo,
> + struct phy_device *phy,
> + enum phy_upstream upt, void *upstream)
> +{
> + return 0;
> +}
> +
> +static void phy_link_topo_del_phy(struct phy_link_topology *topo,
> + struct phy_device *phy)
> +{
> +}
> +#endif
nit: functions in .h should be declared static inline
...
> diff --git a/net/core/dev.c b/net/core/dev.c
...
> @@ -10832,6 +10833,8 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
> #ifdef CONFIG_NET_SCHED
> hash_init(dev->qdisc_hash);
> #endif
> + phy_link_topo_init(&dev->link_topo);
> +
I don't think this can work unless PHYLIB is compiled as a built-in.
> dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM;
> setup(dev);
>
> --
> 2.42.0
>
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