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Date: Mon, 13 May 2024 09:30:29 +0200
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Heiner Kallweit <hkallweit1@...il.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>,
Vladimir Oltean <vladimir.oltean@....com>, Köry Maincent
<kory.maincent@...tlin.com>, Jesse Brandeburg <jesse.brandeburg@...el.com>,
Marek Behún <kabel@...nel.org>, Piergiorgio Beruto
<piergiorgio.beruto@...il.com>, Oleksij Rempel <o.rempel@...gutronix.de>,
Nicolò Veronese <nicveronese@...il.com>, Simon Horman
<horms@...nel.org>, mwojtas@...omium.org, Nathan Chancellor
<nathan@...nel.org>, Antoine Tenart <atenart@...nel.org>
Subject: Re: [PATCH net-next 2/2] net: phy: phy_link_topology:
Lazy-initialize the link topology
Hi Heiner,
On Wed, 8 May 2024 07:44:22 +0200
Heiner Kallweit <hkallweit1@...il.com> wrote:
> On 07.05.2024 12:28, Maxime Chevallier wrote:
> > Having the net_device's init path for the link_topology depend on
> > IS_REACHABLE(PHYLIB)-protected helpers triggers errors when modules are being
> > built with phylib as a module as-well, as they expect netdev->link_topo
> > to be initialized.
> >
> > Move the link_topo initialization at the first PHY insertion, which will
> > both improve the memory usage, and make the behaviour more predicatble
> > and robust.
> >
> > Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
> > Fixes: 6916e461e793 ("net: phy: Introduce ethernet link topology representation")
> > Closes: https://lore.kernel.org/netdev/2e11b89d-100f-49e7-9c9a-834cc0b82f97@gmail.com/
> > Closes: https://lore.kernel.org/netdev/20240409201553.GA4124869@dev-arch.thelio-3990X/
> > ---
> > drivers/net/phy/phy_link_topology.c | 31 ++++++---------------
> > include/linux/netdevice.h | 2 ++
> > include/linux/phy_link_topology.h | 23 ++++++++--------
> > include/linux/phy_link_topology_core.h | 23 +++-------------
> > net/core/dev.c | 38 ++++++++++++++++++++++----
> > 5 files changed, 58 insertions(+), 59 deletions(-)
> >
> > diff --git a/drivers/net/phy/phy_link_topology.c b/drivers/net/phy/phy_link_topology.c
> > index 0e36bd7c15dc..b1aba9313e73 100644
> > --- a/drivers/net/phy/phy_link_topology.c
> > +++ b/drivers/net/phy/phy_link_topology.c
> > @@ -12,29 +12,6 @@
> > #include <linux/rtnetlink.h>
> > #include <linux/xarray.h>
> >
> > -struct phy_link_topology *phy_link_topo_create(struct net_device *dev)
> > -{
> > - struct phy_link_topology *topo;
> > -
> > - topo = kzalloc(sizeof(*topo), GFP_KERNEL);
> > - if (!topo)
> > - return ERR_PTR(-ENOMEM);
> > -
> > - xa_init_flags(&topo->phys, XA_FLAGS_ALLOC1);
> > - topo->next_phy_index = 1;
> > -
> > - return topo;
> > -}
> > -
> > -void phy_link_topo_destroy(struct phy_link_topology *topo)
> > -{
> > - if (!topo)
> > - return;
> > -
> > - xa_destroy(&topo->phys);
> > - kfree(topo);
> > -}
> > -
> > int phy_link_topo_add_phy(struct net_device *dev,
> > struct phy_device *phy,
> > enum phy_upstream upt, void *upstream)
> > @@ -43,6 +20,14 @@ int phy_link_topo_add_phy(struct net_device *dev,
> > struct phy_device_node *pdn;
> > int ret;
> >
> > + if (!topo) {
> > + ret = netdev_alloc_phy_link_topology(dev);
>
> This function is implemented in net core, but used only here.
> So move the implementation here?
If it's OK not to have both helpers to alloc and destroy in different
files, then I'll move it :)
>
> > + if (ret)
> > + return ret;
> > +
> > + topo = dev->link_topo;
> > + }
> > +
> > pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
> > if (!pdn)
> > return -ENOMEM;
> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > index cf261fb89d73..25a0a77cfadc 100644
> > --- a/include/linux/netdevice.h
> > +++ b/include/linux/netdevice.h
> > @@ -4569,6 +4569,8 @@ void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
> > const unsigned char *));
> > void __hw_addr_init(struct netdev_hw_addr_list *list);
> >
> > +int netdev_alloc_phy_link_topology(struct net_device *dev);
> > +
> > /* Functions used for device addresses handling */
> > void dev_addr_mod(struct net_device *dev, unsigned int offset,
> > const void *addr, size_t len);
> > diff --git a/include/linux/phy_link_topology.h b/include/linux/phy_link_topology.h
> > index 166a01710aa2..3501f9a9e932 100644
> > --- a/include/linux/phy_link_topology.h
> > +++ b/include/linux/phy_link_topology.h
> > @@ -32,10 +32,12 @@ struct phy_device_node {
> > struct phy_device *phy;
> > };
> >
> > -struct phy_link_topology {
> > - struct xarray phys;
> > - u32 next_phy_index;
> > -};
> > +#if IS_ENABLED(CONFIG_PHYLIB)
> > +int phy_link_topo_add_phy(struct net_device *dev,
> > + struct phy_device *phy,
> > + enum phy_upstream upt, void *upstream);
> > +
> > +void phy_link_topo_del_phy(struct net_device *dev, struct phy_device *phy);
> >
> > static inline struct phy_device
> > *phy_link_topo_get_phy(struct net_device *dev, u32 phyindex)
> > @@ -53,13 +55,6 @@ static inline struct phy_device
> > return NULL;
> > }
> >
> > -#if IS_REACHABLE(CONFIG_PHYLIB)
> > -int phy_link_topo_add_phy(struct net_device *dev,
> > - struct phy_device *phy,
> > - enum phy_upstream upt, void *upstream);
> > -
> > -void phy_link_topo_del_phy(struct net_device *dev, struct phy_device *phy);
> > -
> > #else
> > static inline int phy_link_topo_add_phy(struct net_device *dev,
> > struct phy_device *phy,
> > @@ -72,6 +67,12 @@ static inline void phy_link_topo_del_phy(struct net_device *dev,
> > struct phy_device *phy)
> > {
> > }
> > +
> > +static inline struct phy_device *
> > +phy_link_topo_get_phy(struct net_device *dev, u32 phyindex)
> > +{
> > + return NULL;
> > +}
> > #endif
> >
> > #endif /* __PHY_LINK_TOPOLOGY_H */
> > diff --git a/include/linux/phy_link_topology_core.h b/include/linux/phy_link_topology_core.h
> > index 0a6479055745..f9c0520806fb 100644
> > --- a/include/linux/phy_link_topology_core.h
> > +++ b/include/linux/phy_link_topology_core.h
> > @@ -2,24 +2,9 @@
> > #ifndef __PHY_LINK_TOPOLOGY_CORE_H
> > #define __PHY_LINK_TOPOLOGY_CORE_H
> >
> > -struct phy_link_topology;
> > -
> > -#if IS_REACHABLE(CONFIG_PHYLIB)
> > -
> > -struct phy_link_topology *phy_link_topo_create(struct net_device *dev);
> > -void phy_link_topo_destroy(struct phy_link_topology *topo);
> > -
> > -#else
> > -
> > -static inline struct phy_link_topology *phy_link_topo_create(struct net_device *dev)
> > -{
> > - return NULL;
> > -}
> > -
> > -static inline void phy_link_topo_destroy(struct phy_link_topology *topo)
> > -{
> > -}
> > -
> > -#endif
> > +struct phy_link_topology {
> > + struct xarray phys;
> > + u32 next_phy_index;
> > +};
> >
> This is all which is left in this header. As this header is public anyway,
> better move this definition to phy_link_topology.h?
Well I'll have to include the whole phy_link_topology.h in
net/core/dev.c, and I was trying to avoid including that whole header,
and keep the included content to a bare minimum.
>
> > #endif /* __PHY_LINK_TOPOLOGY_CORE_H */
> > diff --git a/net/core/dev.c b/net/core/dev.c
> > index d2ce91a334c1..1b4ffc273a04 100644
> > --- a/net/core/dev.c
> > +++ b/net/core/dev.c
> > @@ -10256,6 +10256,35 @@ static void netdev_do_free_pcpu_stats(struct net_device *dev)
> > }
> > }
> >
> > +int netdev_alloc_phy_link_topology(struct net_device *dev)
> > +{
> > + struct phy_link_topology *topo;
> > +
> > + topo = kzalloc(sizeof(*topo), GFP_KERNEL);
> > + if (!topo)
> > + return -ENOMEM;
> > +
> > + xa_init_flags(&topo->phys, XA_FLAGS_ALLOC1);
> > + topo->next_phy_index = 1;
> > +
> > + dev->link_topo = topo;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(netdev_alloc_phy_link_topology);
> > +
> > +static void netdev_free_phy_link_topology(struct net_device *dev)
> > +{
> > + struct phy_link_topology *topo = dev->link_topo;
> > +
> > + if (!topo)
> > + return;
> > +
> > + xa_destroy(&topo->phys);
> > + kfree(topo);
> > + dev->link_topo = NULL;
>
> Give the compiler a chance to remove this function if
> CONFIG_PHYLIB isn't enabled.
>
> if (IS_ENABLED(CONFIG_PHYLIB) && topo) {
> xa_destroy(&topo->phys);
> kfree(topo);
> dev->link_topo = NULL;
> }
Well if we add more things to the link topology, then it's going to be
easy to forget updating that without clear helpers for alloc/destroy,
don't you think ?
I can try to squeeze another iteration before net-next closes.
Maxime
> > +}
> > +
> > /**
> > * register_netdevice() - register a network device
> > * @dev: device to register
> > @@ -10998,11 +11027,6 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
> > #ifdef CONFIG_NET_SCHED
> > hash_init(dev->qdisc_hash);
> > #endif
> > - dev->link_topo = phy_link_topo_create(dev);
> > - if (IS_ERR(dev->link_topo)) {
> > - dev->link_topo = NULL;
> > - goto free_all;
> > - }
> >
> > dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM;
> > setup(dev);
> > @@ -11092,7 +11116,9 @@ void free_netdev(struct net_device *dev)
> > free_percpu(dev->xdp_bulkq);
> > dev->xdp_bulkq = NULL;
> >
> > - phy_link_topo_destroy(dev->link_topo);
> > +#if IS_ENABLED(CONFIG_PHYLIB)
> > + netdev_free_phy_link_topology(dev);
> > +#endif
> >
> Then the conditional compiling can be removed here.
>
> > /* Compatibility with error handling in drivers */
> > if (dev->reg_state == NETREG_UNINITIALIZED ||
>
>
>
>
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