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authorIdo Schimmel <idosch@mellanox.com>2019-08-17 16:28:12 +0300
committerDavid S. Miller <davem@davemloft.net>2019-08-17 12:40:08 -0700
commitedd3d0074c256848bbf5805350b39d40b1e2bf2b (patch)
tree5606e7b74ef722693ac100484b88d7b1cf6e14bc /net
parentcac1174fa17f2cf5d504cbe00c0053f0b9e3b58d (diff)
drop_monitor: Add basic infrastructure for hardware drops
Export a function that can be invoked in order to report packets that were dropped by the underlying hardware along with metadata. Subsequent patches will add support for the different alert modes. 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')
-rw-r--r--net/core/drop_monitor.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c
index aa9147a18329..6020f34728af 100644
--- a/net/core/drop_monitor.c
+++ b/net/core/drop_monitor.c
@@ -26,6 +26,7 @@
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <net/drop_monitor.h>
#include <net/genetlink.h>
#include <net/netevent.h>
@@ -43,6 +44,7 @@
* netlink alerts
*/
static int trace_state = TRACE_OFF;
+static bool monitor_hw;
/* net_dm_mutex
*
@@ -93,6 +95,8 @@ struct net_dm_alert_ops {
void (*napi_poll_probe)(void *ignore, struct napi_struct *napi,
int work, int budget);
void (*work_item_func)(struct work_struct *work);
+ void (*hw_probe)(struct sk_buff *skb,
+ const struct net_dm_hw_metadata *hw_metadata);
};
struct net_dm_skb_cb {
@@ -267,10 +271,17 @@ static void trace_napi_poll_hit(void *ignore, struct napi_struct *napi,
rcu_read_unlock();
}
+static void
+net_dm_hw_summary_probe(struct sk_buff *skb,
+ const struct net_dm_hw_metadata *hw_metadata)
+{
+}
+
static const struct net_dm_alert_ops net_dm_alert_summary_ops = {
.kfree_skb_probe = trace_kfree_skb_hit,
.napi_poll_probe = trace_napi_poll_hit,
.work_item_func = send_dm_alert,
+ .hw_probe = net_dm_hw_summary_probe,
};
static void net_dm_packet_trace_kfree_skb_hit(void *ignore,
@@ -482,10 +493,17 @@ static void net_dm_packet_work(struct work_struct *work)
net_dm_packet_report(skb);
}
+static void
+net_dm_hw_packet_probe(struct sk_buff *skb,
+ const struct net_dm_hw_metadata *hw_metadata)
+{
+}
+
static const struct net_dm_alert_ops net_dm_alert_packet_ops = {
.kfree_skb_probe = net_dm_packet_trace_kfree_skb_hit,
.napi_poll_probe = net_dm_packet_trace_napi_poll_hit,
.work_item_func = net_dm_packet_work,
+ .hw_probe = net_dm_hw_packet_probe,
};
static const struct net_dm_alert_ops *net_dm_alert_ops_arr[] = {
@@ -493,6 +511,16 @@ static const struct net_dm_alert_ops *net_dm_alert_ops_arr[] = {
[NET_DM_ALERT_MODE_PACKET] = &net_dm_alert_packet_ops,
};
+void net_dm_hw_report(struct sk_buff *skb,
+ const struct net_dm_hw_metadata *hw_metadata)
+{
+ if (!monitor_hw)
+ return;
+
+ net_dm_alert_ops_arr[net_dm_alert_mode]->hw_probe(skb, hw_metadata);
+}
+EXPORT_SYMBOL_GPL(net_dm_hw_report);
+
static int net_dm_trace_on_set(struct netlink_ext_ack *extack)
{
const struct net_dm_alert_ops *ops;