[PATCH 6.7 654/713] devlink: Allow taking device lock in pre_doit operations

Sasha Levin
2024-03-24T22:58:11Z

From: Ido Schimmel <idosch@nvidia.com>

[ Upstream commit d32c38256db30a2d55b849e2c77342bc70d58c6e ]

Introduce a new private flag ('DEVLINK_NL_FLAG_NEED_DEV_LOCK') to allow
netlink commands to specify that they need to acquire the device lock in
their pre_doit operation and release it in their post_doit operation.

The reload command will use this flag in the subsequent patch.

No functional changes intended.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: d7d75124965a ("devlink: Fix devlink parallel commands processing")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/devlink/devl_internal.h | 3 ++-
net/devlink/health.c | 3 ++-
net/devlink/netlink.c | 19 ++++++++++++-------
net/devlink/region.c | 3 ++-
4 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 178abaf74a107..5ea2e2012e930 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -152,7 +152,8 @@ typedef int devlink_nl_dump_one_func_t(struct sk_buff *msg,
int flags);

struct devlink *
-devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs);
+devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs,
+ bool dev_lock);

int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb,
devlink_nl_dump_one_func_t *dump_one);
diff --git a/net/devlink/health.c b/net/devlink/health.c
index 695df61f8ac2a..71ae121dc739d 100644
--- a/net/devlink/health.c
+++ b/net/devlink/health.c
@@ -1151,7 +1151,8 @@ devlink_health_reporter_get_from_cb_lock(struct netlink_callback *cb)
struct nlattr **attrs = info->attrs;
struct devlink *devlink;

- devlink = devlink_get_from_attrs_lock(sock_net(cb->skb->sk), attrs);
+ devlink = devlink_get_from_attrs_lock(sock_net(cb->skb->sk), attrs,
+ false);
if (IS_ERR(devlink))
return NULL;

diff --git a/net/devlink/netlink.c b/net/devlink/netlink.c
index 5bb6624f3288e..86f12531bf998 100644
--- a/net/devlink/netlink.c
+++ b/net/devlink/netlink.c
@@ -11,6 +11,7 @@

#define DEVLINK_NL_FLAG_NEED_PORT BIT(0)
#define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT BIT(1)
+#define DEVLINK_NL_FLAG_NEED_DEV_LOCK BIT(2)

static const struct genl_multicast_group devlink_nl_mcgrps[] = {
[DEVLINK_MCGRP_CONFIG] = { .name = DEVLINK_GENL_MCGRP_CONFIG_NAME },
@@ -64,7 +65,8 @@ int devlink_nl_msg_reply_and_new(struct sk_buff **msg, struct genl_info *info)
}

struct devlink *
-devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs)
+devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs,
+ bool dev_lock)
{
struct devlink *devlink;
unsigned long index;
@@ -78,12 +80,12 @@ devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs)
devname = nla_data(attrs[DEVLINK_ATTR_DEV_NAME]);

devlinks_xa_for_each_registered_get(net, index, devlink) {
- devl_lock(devlink);
+ devl_dev_lock(devlink, dev_lock);
if (devl_is_registered(devlink) &&
strcmp(devlink->dev->bus->name, busname) == 0 &&
strcmp(dev_name(devlink->dev), devname) == 0)
return devlink;
- devl_unlock(devlink);
+ devl_dev_unlock(devlink, dev_lock);
devlink_put(devlink);
}

@@ -93,11 +95,13 @@ devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs)
static int __devlink_nl_pre_doit(struct sk_buff *skb, struct genl_info *info,
u8 flags)
{
+ bool dev_lock = flags & DEVLINK_NL_FLAG_NEED_DEV_LOCK;
struct devlink_port *devlink_port;
struct devlink *devlink;
int err;

- devlink = devlink_get_from_attrs_lock(genl_info_net(info), info->attrs);
+ devlink = devlink_get_from_attrs_lock(genl_info_net(info), info->attrs,
+ dev_lock);
if (IS_ERR(devlink))
return PTR_ERR(devlink);

@@ -117,7 +121,7 @@ static int __devlink_nl_pre_doit(struct sk_buff *skb, struct genl_info *info,
return 0;

unlock:
- devl_unlock(devlink);
+ devl_dev_unlock(devlink, dev_lock);
devlink_put(devlink);
return err;
}
@@ -144,10 +148,11 @@ int devlink_nl_pre_doit_port_optional(const struct genl_split_ops *ops,
static void __devlink_nl_post_doit(struct sk_buff *skb, struct genl_info *info,
u8 flags)
{
+ bool dev_lock = flags & DEVLINK_NL_FLAG_NEED_DEV_LOCK;
struct devlink *devlink;

devlink = info->user_ptr[0];
- devl_unlock(devlink);
+ devl_dev_unlock(devlink, dev_lock);
devlink_put(devlink);
}

@@ -165,7 +170,7 @@ static int devlink_nl_inst_single_dumpit(struct sk_buff *msg,
struct devlink *devlink;
int err;

- devlink = devlink_get_from_attrs_lock(sock_net(msg->sk), attrs);
+ devlink = devlink_get_from_attrs_lock(sock_net(msg->sk), attrs, false);
if (IS_ERR(devlink))
return PTR_ERR(devlink);
err = dump_one(msg, devlink, cb, flags | NLM_F_DUMP_FILTERED);
diff --git a/net/devlink/region.c b/net/devlink/region.c
index 0aab7b82d6780..e3bab458db940 100644
--- a/net/devlink/region.c
+++ b/net/devlink/region.c
@@ -883,7 +883,8 @@ int devlink_nl_region_read_dumpit(struct sk_buff *skb,

start_offset = state->start_offset;

- devlink = devlink_get_from_attrs_lock(sock_net(cb->skb->sk), attrs);
+ devlink = devlink_get_from_attrs_lock(sock_net(cb->skb->sk), attrs,
+ false);
if (IS_ERR(devlink))
return PTR_ERR(devlink);

--
2.43.0