From: Leon Romanovsky <leon@kernel.org>
To: "David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>
Cc: Leon Romanovsky <leonro@nvidia.com>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH net-next v1] netdevsim: Forbid devlink reload when adding or deleting ports
Date: Thu, 5 Aug 2021 14:05:41 +0300 [thread overview]
Message-ID: <53cd1a28dd34ced9fb4c39885c6e13523e97d62c.1628161323.git.leonro@nvidia.com> (raw)
Message-ID: <20210805110541.5vJK4VuKOozm7NbU1Fan7Y2FxjUiUTsdXYyGeCMAllA@z> (raw)
From: Leon Romanovsky <leonro@nvidia.com>
In order to remove complexity in devlink core related to
devlink_reload_enable/disable, let's rewrite new_port/del_port
logic to rely on internal to netdevsim lock.
We should protect only reload_down flow because it destroys nsim_dev,
which is needed for nsim_dev_port_add/nsim_dev_port_del to hold
port_list_lock.
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
Changelog:
v1:
* fixed typo in the commit message
v0: https://lore.kernel.org/netdev/53cd1a28dd34ced9fb4c39885c6e13523e97d62c.1628161323.git.leonro@nvidia.com/T/#u
---
drivers/net/netdevsim/bus.c | 16 ++++------------
drivers/net/netdevsim/dev.c | 7 +++++++
2 files changed, 11 insertions(+), 12 deletions(-)
diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c
index ff01e5bdc72e..a29ec264119d 100644
--- a/drivers/net/netdevsim/bus.c
+++ b/drivers/net/netdevsim/bus.c
@@ -183,8 +183,6 @@ new_port_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
- struct nsim_dev *nsim_dev = dev_get_drvdata(dev);
- struct devlink *devlink;
unsigned int port_index;
int ret;
@@ -195,12 +193,10 @@ new_port_store(struct device *dev, struct device_attribute *attr,
if (ret)
return ret;
- devlink = priv_to_devlink(nsim_dev);
+ if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock))
+ return -EBUSY;
- mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
- devlink_reload_disable(devlink);
ret = nsim_dev_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
- devlink_reload_enable(devlink);
mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
return ret ? ret : count;
}
@@ -212,8 +208,6 @@ del_port_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
- struct nsim_dev *nsim_dev = dev_get_drvdata(dev);
- struct devlink *devlink;
unsigned int port_index;
int ret;
@@ -224,12 +218,10 @@ del_port_store(struct device *dev, struct device_attribute *attr,
if (ret)
return ret;
- devlink = priv_to_devlink(nsim_dev);
+ if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock))
+ return -EBUSY;
- mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
- devlink_reload_disable(devlink);
ret = nsim_dev_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
- devlink_reload_enable(devlink);
mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
return ret ? ret : count;
}
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index d538a39d4225..ff5714209b86 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -864,16 +864,23 @@ static int nsim_dev_reload_down(struct devlink *devlink, bool netns_change,
struct netlink_ext_ack *extack)
{
struct nsim_dev *nsim_dev = devlink_priv(devlink);
+ struct nsim_bus_dev *nsim_bus_dev;
+
+ nsim_bus_dev = nsim_dev->nsim_bus_dev;
+ if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock))
+ return -EOPNOTSUPP;
if (nsim_dev->dont_allow_reload) {
/* For testing purposes, user set debugfs dont_allow_reload
* value to true. So forbid it.
*/
NL_SET_ERR_MSG_MOD(extack, "User forbid the reload for testing purposes");
+ mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
return -EOPNOTSUPP;
}
nsim_dev_reload_destroy(nsim_dev);
+ mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
return 0;
}
--
2.31.1
next reply other threads:[~2021-08-05 11:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-05 11:02 Leon Romanovsky [this message]
2021-08-05 11:05 ` [PATCH net-next v1] netdevsim: Forbid devlink reload when adding or deleting ports Leon Romanovsky
2021-08-05 12:40 ` [PATCH net-next] " patchwork-bot+netdevbpf
2021-08-05 13:15 ` [PATCH net-next v1] " Jakub Kicinski
2021-08-05 13:51 ` Leon Romanovsky
2021-08-05 14:23 ` Jakub Kicinski
2021-08-05 14:33 ` Leon Romanovsky
2021-08-05 15:27 ` Jakub Kicinski
2021-08-05 17:35 ` Leon Romanovsky
2021-08-05 18:02 ` Leon Romanovsky
2021-08-05 19:12 ` Jakub Kicinski
2021-08-06 11:19 ` Leon Romanovsky
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