devlink: Notify users when objects are accessible

The devlink core code notified users about add/remove objects without
relation if this object can be accessible or not. In this patch we unify
such user visible notifications in one place.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 3ea33c689790dc111ba3372d6e644391d2885445..06edb2f1d21e04153e3d8f026139573f256ddd23 100644 (file)
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -742,6 +742,7 @@ static void devlink_notify(struct devlink *devlink, enum devlink_command cmd)
        int err;
 
        WARN_ON(cmd != DEVLINK_CMD_NEW && cmd != DEVLINK_CMD_DEL);
+       WARN_ON(!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED));
 
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
@@ -1040,11 +1041,15 @@ nla_put_failure:
 static void devlink_port_notify(struct devlink_port *devlink_port,
                                enum devlink_command cmd)
 {
+       struct devlink *devlink = devlink_port->devlink;
        struct sk_buff *msg;
        int err;
 
        WARN_ON(cmd != DEVLINK_CMD_PORT_NEW && cmd != DEVLINK_CMD_PORT_DEL);
 
+       if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
+               return;
+
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
                return;
@@ -1055,18 +1060,19 @@ static void devlink_port_notify(struct devlink_port *devlink_port,
                return;
        }
 
-       genlmsg_multicast_netns(&devlink_nl_family,
-                               devlink_net(devlink_port->devlink), msg, 0,
-                               DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
+       genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink), msg,
+                               0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
 }
 
 static void devlink_rate_notify(struct devlink_rate *devlink_rate,
                                enum devlink_command cmd)
 {
+       struct devlink *devlink = devlink_rate->devlink;
        struct sk_buff *msg;
        int err;
 
        WARN_ON(cmd != DEVLINK_CMD_RATE_NEW && cmd != DEVLINK_CMD_RATE_DEL);
+       WARN_ON(!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED));
 
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
@@ -1078,9 +1084,8 @@ static void devlink_rate_notify(struct devlink_rate *devlink_rate,
                return;
        }
 
-       genlmsg_multicast_netns(&devlink_nl_family,
-                               devlink_net(devlink_rate->devlink), msg, 0,
-                               DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
+       genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink), msg,
+                               0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
 }
 
 static int devlink_nl_cmd_rate_get_dumpit(struct sk_buff *msg,
@@ -4150,6 +4155,7 @@ static void __devlink_flash_update_notify(struct devlink *devlink,
        WARN_ON(cmd != DEVLINK_CMD_FLASH_UPDATE &&
                cmd != DEVLINK_CMD_FLASH_UPDATE_END &&
                cmd != DEVLINK_CMD_FLASH_UPDATE_STATUS);
+       WARN_ON(!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED));
 
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
@@ -5145,17 +5151,18 @@ static void devlink_nl_region_notify(struct devlink_region *region,
                                     struct devlink_snapshot *snapshot,
                                     enum devlink_command cmd)
 {
+       struct devlink *devlink = region->devlink;
        struct sk_buff *msg;
 
        WARN_ON(cmd != DEVLINK_CMD_REGION_NEW && cmd != DEVLINK_CMD_REGION_DEL);
+       WARN_ON(!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED));
 
        msg = devlink_nl_region_notify_build(region, snapshot, cmd, 0, 0);
        if (IS_ERR(msg))
                return;
 
-       genlmsg_multicast_netns(&devlink_nl_family,
-                               devlink_net(region->devlink), msg, 0,
-                               DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
+       genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink), msg,
+                               0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
 }
 
 /**
@@ -6920,10 +6927,12 @@ genlmsg_cancel:
 static void devlink_recover_notify(struct devlink_health_reporter *reporter,
                                   enum devlink_command cmd)
 {
+       struct devlink *devlink = reporter->devlink;
        struct sk_buff *msg;
        int err;
 
        WARN_ON(cmd != DEVLINK_CMD_HEALTH_REPORTER_RECOVER);
+       WARN_ON(!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED));
 
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
@@ -6935,9 +6944,8 @@ static void devlink_recover_notify(struct devlink_health_reporter *reporter,
                return;
        }
 
-       genlmsg_multicast_netns(&devlink_nl_family,
-                               devlink_net(reporter->devlink),
-                               msg, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
+       genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink), msg,
+                               0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
 }
 
 void
@@ -8955,6 +8963,68 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
 }
 EXPORT_SYMBOL_GPL(devlink_alloc_ns);
 
+static void
+devlink_trap_policer_notify(struct devlink *devlink,
+                           const struct devlink_trap_policer_item *policer_item,
+                           enum devlink_command cmd);
+static void
+devlink_trap_group_notify(struct devlink *devlink,
+                         const struct devlink_trap_group_item *group_item,
+                         enum devlink_command cmd);
+static void devlink_trap_notify(struct devlink *devlink,
+                               const struct devlink_trap_item *trap_item,
+                               enum devlink_command cmd);
+
+static void devlink_notify_register(struct devlink *devlink)
+{
+       struct devlink_trap_policer_item *policer_item;
+       struct devlink_trap_group_item *group_item;
+       struct devlink_trap_item *trap_item;
+       struct devlink_port *devlink_port;
+
+       devlink_notify(devlink, DEVLINK_CMD_NEW);
+       list_for_each_entry(devlink_port, &devlink->port_list, list)
+               devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW);
+
+       list_for_each_entry(policer_item, &devlink->trap_policer_list, list)
+               devlink_trap_policer_notify(devlink, policer_item,
+                                           DEVLINK_CMD_TRAP_POLICER_NEW);
+
+       list_for_each_entry(group_item, &devlink->trap_group_list, list)
+               devlink_trap_group_notify(devlink, group_item,
+                                         DEVLINK_CMD_TRAP_GROUP_NEW);
+
+       list_for_each_entry(trap_item, &devlink->trap_list, list)
+               devlink_trap_notify(devlink, trap_item, DEVLINK_CMD_TRAP_NEW);
+
+       devlink_params_publish(devlink);
+}
+
+static void devlink_notify_unregister(struct devlink *devlink)
+{
+       struct devlink_trap_policer_item *policer_item;
+       struct devlink_trap_group_item *group_item;
+       struct devlink_trap_item *trap_item;
+       struct devlink_port *devlink_port;
+
+       devlink_params_unpublish(devlink);
+
+       list_for_each_entry_reverse(trap_item, &devlink->trap_list, list)
+               devlink_trap_notify(devlink, trap_item, DEVLINK_CMD_TRAP_DEL);
+
+       list_for_each_entry_reverse(group_item, &devlink->trap_group_list, list)
+               devlink_trap_group_notify(devlink, group_item,
+                                         DEVLINK_CMD_TRAP_GROUP_DEL);
+       list_for_each_entry_reverse(policer_item, &devlink->trap_policer_list,
+                                   list)
+               devlink_trap_policer_notify(devlink, policer_item,
+                                           DEVLINK_CMD_TRAP_POLICER_DEL);
+
+       list_for_each_entry_reverse(devlink_port, &devlink->port_list, list)
+               devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_DEL);
+       devlink_notify(devlink, DEVLINK_CMD_DEL);
+}
+
 /**
  *     devlink_register - Register devlink instance
  *
@@ -8964,7 +9034,7 @@ void devlink_register(struct devlink *devlink)
 {
        mutex_lock(&devlink_mutex);
        xa_set_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
-       devlink_notify(devlink, DEVLINK_CMD_NEW);
+       devlink_notify_register(devlink);
        mutex_unlock(&devlink_mutex);
 }
 EXPORT_SYMBOL_GPL(devlink_register);
@@ -8982,7 +9052,7 @@ void devlink_unregister(struct devlink *devlink)
        mutex_lock(&devlink_mutex);
        WARN_ON(devlink_reload_supported(devlink->ops) &&
                devlink->reload_enabled);
-       devlink_notify(devlink, DEVLINK_CMD_DEL);
+       devlink_notify_unregister(devlink);
        xa_clear_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
        mutex_unlock(&devlink_mutex);
 }
@@ -10086,6 +10156,9 @@ void devlink_params_publish(struct devlink *devlink)
 {
        struct devlink_param_item *param_item;
 
+       if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
+               return;
+
        list_for_each_entry(param_item, &devlink->param_list, list) {
                if (param_item->published)
                        continue;
@@ -10631,6 +10704,8 @@ devlink_trap_group_notify(struct devlink *devlink,
 
        WARN_ON_ONCE(cmd != DEVLINK_CMD_TRAP_GROUP_NEW &&
                     cmd != DEVLINK_CMD_TRAP_GROUP_DEL);
+       if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
+               return;
 
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
@@ -10672,6 +10747,8 @@ static void devlink_trap_notify(struct devlink *devlink,
 
        WARN_ON_ONCE(cmd != DEVLINK_CMD_TRAP_NEW &&
                     cmd != DEVLINK_CMD_TRAP_DEL);
+       if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
+               return;
 
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
@@ -11053,6 +11130,8 @@ devlink_trap_policer_notify(struct devlink *devlink,
 
        WARN_ON_ONCE(cmd != DEVLINK_CMD_TRAP_POLICER_NEW &&
                     cmd != DEVLINK_CMD_TRAP_POLICER_DEL);
+       if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
+               return;
 
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)