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authorIdo Schimmel <idosch@mellanox.com>2019-08-17 16:28:10 +0300
committerDavid S. Miller <davem@davemloft.net>2019-08-17 22:40:08 +0300
commit9b63f57d4ab981e18e35def3349040527ead93c3 (patch)
tree7e01282d4b43c3be9b4ecd6941228aeca210f5c1 /net/core/drop_monitor.c
parentf77508308fa76d0efc60ebf3c906f467feb062cb (diff)
downloadlinux-9b63f57d4ab981e18e35def3349040527ead93c3.tar.xz
drop_monitor: Move per-CPU data init/fini to separate functions
Currently drop monitor only reports software drops to user space, but subsequent patches are going to add support for hardware drops. Like software drops, the per-CPU data of hardware drops needs to be initialized and de-initialized upon module initialization and exit. To avoid code duplication, break this code into separate functions, so that these could be re-used for hardware drops. No functional changes intended. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/drop_monitor.c')
-rw-r--r--net/core/drop_monitor.c53
1 files changed, 36 insertions, 17 deletions
diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c
index 39e094907391..349ab78b8c3e 100644
--- a/net/core/drop_monitor.c
+++ b/net/core/drop_monitor.c
@@ -934,9 +934,40 @@ static struct notifier_block dropmon_net_notifier = {
.notifier_call = dropmon_net_event
};
-static int __init init_net_drop_monitor(void)
+static void __net_dm_cpu_data_init(struct per_cpu_dm_data *data)
+{
+ spin_lock_init(&data->lock);
+ skb_queue_head_init(&data->drop_queue);
+ u64_stats_init(&data->stats.syncp);
+}
+
+static void __net_dm_cpu_data_fini(struct per_cpu_dm_data *data)
+{
+ WARN_ON(!skb_queue_empty(&data->drop_queue));
+}
+
+static void net_dm_cpu_data_init(int cpu)
{
struct per_cpu_dm_data *data;
+
+ data = &per_cpu(dm_cpu_data, cpu);
+ __net_dm_cpu_data_init(data);
+}
+
+static void net_dm_cpu_data_fini(int cpu)
+{
+ struct per_cpu_dm_data *data;
+
+ data = &per_cpu(dm_cpu_data, cpu);
+ /* At this point, we should have exclusive access
+ * to this struct and can free the skb inside it.
+ */
+ consume_skb(data->skb);
+ __net_dm_cpu_data_fini(data);
+}
+
+static int __init init_net_drop_monitor(void)
+{
int cpu, rc;
pr_info("Initializing network drop monitor service\n");
@@ -961,12 +992,8 @@ static int __init init_net_drop_monitor(void)
rc = 0;
- for_each_possible_cpu(cpu) {
- data = &per_cpu(dm_cpu_data, cpu);
- spin_lock_init(&data->lock);
- skb_queue_head_init(&data->drop_queue);
- u64_stats_init(&data->stats.syncp);
- }
+ for_each_possible_cpu(cpu)
+ net_dm_cpu_data_init(cpu);
goto out;
@@ -978,7 +1005,6 @@ out:
static void exit_net_drop_monitor(void)
{
- struct per_cpu_dm_data *data;
int cpu;
BUG_ON(unregister_netdevice_notifier(&dropmon_net_notifier));
@@ -988,15 +1014,8 @@ static void exit_net_drop_monitor(void)
* we are guarnateed not to have any current users when we get here
*/
- for_each_possible_cpu(cpu) {
- data = &per_cpu(dm_cpu_data, cpu);
- /*
- * At this point, we should have exclusive access
- * to this struct and can free the skb inside it
- */
- kfree_skb(data->skb);
- WARN_ON(!skb_queue_empty(&data->drop_queue));
- }
+ for_each_possible_cpu(cpu)
+ net_dm_cpu_data_fini(cpu);
BUG_ON(genl_unregister_family(&net_drop_monitor_family));
}