netdev - Re: [patch net-next v3 0/3] net: devlink: Finish network namespace support

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Date:   Tue, 13 Aug 2019 08:09:59 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        jakub.kicinski@...ronome.com, stephen@...workplumber.org,
        mlxsw@...lanox.com
Subject: Re: [patch net-next v3 0/3] net: devlink: Finish network namespace
 support

Tue, Aug 13, 2019 at 02:24:41AM CEST, dsahern@...il.com wrote:
>On 8/12/19 7:47 AM, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
>> 
>> Devlink from the beginning counts with network namespaces, but the
>> instances has been fixed to init_net. The first patch allows user
>> to move existing devlink instances into namespaces:
>> 
>> $ devlink dev
>> netdevsim/netdevsim1
>> $ ip netns add ns1
>> $ devlink dev set netdevsim/netdevsim1 netns ns1
>> $ devlink -N ns1 dev
>> netdevsim/netdevsim1
>> 
>> The last patch allows user to create new netdevsim instance directly
>> inside network namespace of a caller.
>
>The namespace behavior seems odd to me. If devlink instance is created
>in a namespace and never moved, it should die with the namespace. With
>this patch set, devlink instance and its ports are moved to init_net on
>namespace delete.
>
>The fib controller needs an update to return the namespace of the
>devlink instance (on top of the patch applied to net):

I have really no clue what your fib abomination should behave. The
devlink controls device config, that's it. No relation to netns it is
in.


>
>diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
>index 89795071f085..fa7e876f2d3b 100644
>--- a/drivers/net/netdevsim/dev.c
>+++ b/drivers/net/netdevsim/dev.c
>@@ -114,11 +114,6 @@ static void nsim_dev_port_debugfs_exit(struct
>nsim_dev_port *nsim_dev_port)
>        debugfs_remove_recursive(nsim_dev_port->ddir);
> }
>
>-static struct net *nsim_devlink_net(struct devlink *devlink)
>-{
>-       return &init_net;
>-}
>-
> static u64 nsim_dev_ipv4_fib_resource_occ_get(void *priv)
> {
>        struct net *net = priv;
>@@ -154,7 +149,7 @@ static int nsim_dev_resources_register(struct
>devlink *devlink)
>                .size_granularity = 1,
>                .unit = DEVLINK_RESOURCE_UNIT_ENTRY
>        };
>-       struct net *net = nsim_devlink_net(devlink);
>+       struct net *net = devlink_net(devlink);
>        int err;
>        u64 n;
>
>@@ -309,7 +304,7 @@ static int nsim_dev_reload(struct devlink *devlink,
>                NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
>                NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
>        };
>-       struct net *net = nsim_devlink_net(devlink);
>+       struct net *net = devlink_net(devlink);
>        int i;
>
>        for (i = 0; i < ARRAY_SIZE(res_ids); ++i) {
>