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drop_monitor: Split tracing enable / disable to different functions 

Subsequent patches will need to enable / disable tracing based on the
configured alerting mode.

Reduce the nesting level and prepare for the introduction of this
functionality by splitting the tracing enable / disable operations into
two different functions.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2019-08-11 10:35:46 +03:00 committed by David S. Miller
parent 2cc2743d8f
commit 7c747838a5
1 changed files with 51 additions and 28 deletions
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79
net/core/drop_monitor.c
View File

@ -241,11 +241,58 @@ static void trace_napi_poll_hit(void *ignore, struct napi_struct *napi,
rcu_read_unlock();
}
static int net_dm_trace_on_set(struct netlink_ext_ack *extack)
{
int rc;
if (!try_module_get(THIS_MODULE)) {
NL_SET_ERR_MSG_MOD(extack, "Failed to take reference on module");
return -ENODEV;
}
rc = register_trace_kfree_skb(trace_kfree_skb_hit, NULL);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to connect probe to kfree_skb() tracepoint");
goto err_module_put;
}
rc = register_trace_napi_poll(trace_napi_poll_hit, NULL);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to connect probe to napi_poll() tracepoint");
goto err_unregister_trace;
}
return 0;
err_unregister_trace:
unregister_trace_kfree_skb(trace_kfree_skb_hit, NULL);
err_module_put:
module_put(THIS_MODULE);
return rc;
}
static void net_dm_trace_off_set(void)
{
struct dm_hw_stat_delta *new_stat, *temp;
unregister_trace_napi_poll(trace_napi_poll_hit, NULL);
unregister_trace_kfree_skb(trace_kfree_skb_hit, NULL);
tracepoint_synchronize_unregister();
list_for_each_entry_safe(new_stat, temp, &hw_stats_list, list) {
if (new_stat->dev == NULL) {
list_del_rcu(&new_stat->list);
kfree_rcu(new_stat, rcu);
}
}
module_put(THIS_MODULE);
}
static int set_all_monitor_traces(int state, struct netlink_ext_ack *extack)
{
int rc = 0;
struct dm_hw_stat_delta *new_stat = NULL;
struct dm_hw_stat_delta *temp;
if (state == trace_state) {
NL_SET_ERR_MSG_MOD(extack, "Trace state already set to requested state");
@ -254,34 +301,10 @@ static int set_all_monitor_traces(int state, struct netlink_ext_ack *extack)
switch (state) {
case TRACE_ON:
if (!try_module_get(THIS_MODULE)) {
NL_SET_ERR_MSG_MOD(extack, "Failed to take reference on module");
rc = -ENODEV;
break;
}
rc |= register_trace_kfree_skb(trace_kfree_skb_hit, NULL);
rc |= register_trace_napi_poll(trace_napi_poll_hit, NULL);
rc = net_dm_trace_on_set(extack);
break;
case TRACE_OFF:
rc |= unregister_trace_kfree_skb(trace_kfree_skb_hit, NULL);
rc |= unregister_trace_napi_poll(trace_napi_poll_hit, NULL);
tracepoint_synchronize_unregister();
/*
* Clean the device list
*/
list_for_each_entry_safe(new_stat, temp, &hw_stats_list, list) {
if (new_stat->dev == NULL) {
list_del_rcu(&new_stat->list);
kfree_rcu(new_stat, rcu);
}
}
module_put(THIS_MODULE);
net_dm_trace_off_set();
break;
default:
rc = 1;