linux-kernel - Re: [PATCH net-next 2/2] devlink: Allocate devlink directly in requested net namespace

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Message-ID: <YQKXMT4tbzCnkYlA@nanopsycho>
Date:   Thu, 29 Jul 2021 13:55:29 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Jiri Pirko <jiri@...dia.com>,
        Leon Romanovsky <leonro@...dia.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Parav Pandit <parav@...dia.com>
Subject: Re: [PATCH net-next 2/2] devlink: Allocate devlink directly in
 requested net namespace

Thu, Jul 29, 2021 at 10:15:26AM CEST, leon@...nel.org wrote:
>From: Leon Romanovsky <leonro@...dia.com>
>
>There is no need in extra call indirection and check from impossible
>flow where someone tries to set namespace without prior call
>to devlink_alloc().
>
>Instead of this extra logic and additional EXPORT_SYMBOL, use specialized
>devlink allocation function that receives net namespace as an argument.
>
>Such specialized API allows clear view when devlink initialized in wrong
>net namespace and/or kernel users don't try to change devlink namespace
>under the hood.
>
>Signed-off-by: Leon Romanovsky <leonro@...dia.com>
>---
> drivers/net/netdevsim/dev.c |  4 ++--
> include/net/devlink.h       | 14 ++++++++++++--
> net/core/devlink.c          | 26 ++++++++------------------
> 3 files changed, 22 insertions(+), 22 deletions(-)
>
>diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
>index 6348307bfa84..d538a39d4225 100644
>--- a/drivers/net/netdevsim/dev.c
>+++ b/drivers/net/netdevsim/dev.c
>@@ -1431,10 +1431,10 @@ int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
> 	struct devlink *devlink;
> 	int err;
> 
>-	devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
>+	devlink = devlink_alloc_ns(&nsim_dev_devlink_ops, sizeof(*nsim_dev),
>+				   nsim_bus_dev->initial_net);
> 	if (!devlink)
> 		return -ENOMEM;
>-	devlink_net_set(devlink, nsim_bus_dev->initial_net);
> 	nsim_dev = devlink_priv(devlink);
> 	nsim_dev->nsim_bus_dev = nsim_bus_dev;
> 	nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
>diff --git a/include/net/devlink.h b/include/net/devlink.h
>index e48a62320407..b4691c40320f 100644
>--- a/include/net/devlink.h
>+++ b/include/net/devlink.h
>@@ -1540,8 +1540,18 @@ static inline struct devlink *netdev_to_devlink(struct net_device *dev)
> struct ib_device;
> 
> struct net *devlink_net(const struct devlink *devlink);
>-void devlink_net_set(struct devlink *devlink, struct net *net);
>-struct devlink *devlink_alloc(const struct devlink_ops *ops, size_t priv_size);
>+/* This RAW call is intended for software devices that can

Not sure what "RAW call" is, perhaps you can just avoid this here.

Otherwise, this patch looks fine to me:
Reviewed-by: Jiri Pirko <jiri@...dia.com>

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