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Message-Id: <20230209154308.2984602-3-jiri@resnulli.us>
Date: Thu, 9 Feb 2023 16:43:03 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
edumazet@...gle.com, tariqt@...dia.com, saeedm@...dia.com,
jacob.e.keller@...el.com, gal@...dia.com, kim.phillips@....com,
moshe@...dia.com
Subject: [patch net-next 2/7] devlink: make sure driver does not read updated driverinit param before reload
From: Jiri Pirko <jiri@...dia.com>
The driverinit param purpose is to serve the driver during init/reload
time to provide a value, either default or set by user.
Make sure that driver does not read value updated by user before the
reload is performed. Hold the new value in a separate struct and switch
it during reload.
Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
include/net/devlink.h | 4 ++++
net/devlink/dev.c | 2 ++
net/devlink/devl_internal.h | 3 +++
net/devlink/leftover.c | 26 ++++++++++++++++++++++----
4 files changed, 31 insertions(+), 4 deletions(-)
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 2e85a5970a32..8ed960345f37 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -489,6 +489,10 @@ struct devlink_param_item {
const struct devlink_param *param;
union devlink_param_value driverinit_value;
bool driverinit_value_valid;
+ union devlink_param_value driverinit_value_new; /* Not reachable
+ * until reload.
+ */
+ bool driverinit_value_new_valid;
};
enum devlink_param_generic_id {
diff --git a/net/devlink/dev.c b/net/devlink/dev.c
index 78d824eda5ec..32e5d1b28a47 100644
--- a/net/devlink/dev.c
+++ b/net/devlink/dev.c
@@ -369,6 +369,8 @@ int devlink_reload(struct devlink *devlink, struct net *dest_net,
if (dest_net && !net_eq(dest_net, curr_net))
devlink_reload_netns_change(devlink, curr_net, dest_net);
+ devlink_params_driverinit_load_new(devlink);
+
err = devlink->ops->reload_up(devlink, action, limit, actions_performed, extack);
devlink_reload_failed_set(devlink, !!err);
if (err)
diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 941174e157d4..5c117e8d4377 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -189,6 +189,9 @@ static inline bool devlink_reload_supported(const struct devlink_ops *ops)
return ops->reload_down && ops->reload_up;
}
+/* Params */
+void devlink_params_driverinit_load_new(struct devlink *devlink);
+
/* Resources */
struct devlink_resource;
int devlink_resources_validate(struct devlink *devlink,
diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
index 6225651e34b9..6c4c95c658c7 100644
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -4098,9 +4098,12 @@ static int devlink_nl_param_fill(struct sk_buff *msg, struct devlink *devlink,
if (!devlink_param_cmode_is_supported(param, i))
continue;
if (i == DEVLINK_PARAM_CMODE_DRIVERINIT) {
- if (!param_item->driverinit_value_valid)
+ if (param_item->driverinit_value_new_valid)
+ param_value[i] = param_item->driverinit_value_new;
+ else if (param_item->driverinit_value_valid)
+ param_value[i] = param_item->driverinit_value;
+ else
return -EOPNOTSUPP;
- param_value[i] = param_item->driverinit_value;
} else {
ctx.cmode = i;
err = devlink_param_get(devlink, param, &ctx);
@@ -4388,8 +4391,8 @@ static int __devlink_nl_cmd_param_set_doit(struct devlink *devlink,
return -EOPNOTSUPP;
if (cmode == DEVLINK_PARAM_CMODE_DRIVERINIT) {
- param_item->driverinit_value = value;
- param_item->driverinit_value_valid = true;
+ param_item->driverinit_value_new = value;
+ param_item->driverinit_value_new_valid = true;
} else {
if (!param->set)
return -EOPNOTSUPP;
@@ -9687,6 +9690,21 @@ void devl_param_driverinit_value_set(struct devlink *devlink, u32 param_id,
}
EXPORT_SYMBOL_GPL(devl_param_driverinit_value_set);
+void devlink_params_driverinit_load_new(struct devlink *devlink)
+{
+ struct devlink_param_item *param_item;
+
+ list_for_each_entry(param_item, &devlink->param_list, list) {
+ if (!devlink_param_cmode_is_supported(param_item->param,
+ DEVLINK_PARAM_CMODE_DRIVERINIT) ||
+ !param_item->driverinit_value_new_valid)
+ continue;
+ param_item->driverinit_value = param_item->driverinit_value_new;
+ param_item->driverinit_value_valid = true;
+ param_item->driverinit_value_new_valid = false;
+ }
+}
+
/**
* devl_param_value_changed - notify devlink on a parameter's value
* change. Should be called by the driver
--
2.39.0
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