drop_monitor: Remove no longer used functions

The old probe functions that were invoked by drop monitor code are no
longer called and can thus be removed. They were replaced by actual
probe functions that are registered on the recently introduced
'devlink_trap_report' tracepoint.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/drop_monitor.c

@@ -122,8 +122,6 @@ struct net_dm_alert_ops {
 				int work, int budget);
 	void (*work_item_func)(struct work_struct *work);
 	void (*hw_work_item_func)(struct work_struct *work);
-	void (*hw_probe)(struct sk_buff *skb,
-			 const struct net_dm_hw_metadata *hw_metadata);
 	void (*hw_trap_probe)(void *ignore, const struct devlink *devlink,
 			      struct sk_buff *skb,
 			      const struct devlink_trap_metadata *metadata);
@@ -442,49 +440,6 @@ static void net_dm_hw_summary_work(struct work_struct *work)
 	kfree(hw_entries);
 }
 
-static void
-net_dm_hw_summary_probe(struct sk_buff *skb,
-			const struct net_dm_hw_metadata *hw_metadata)
-{
-	struct net_dm_hw_entries *hw_entries;
-	struct net_dm_hw_entry *hw_entry;
-	struct per_cpu_dm_data *hw_data;
-	unsigned long flags;
-	int i;
-
-	hw_data = this_cpu_ptr(&dm_hw_cpu_data);
-	spin_lock_irqsave(&hw_data->lock, flags);
-	hw_entries = hw_data->hw_entries;
-
-	if (!hw_entries)
-		goto out;
-
-	for (i = 0; i < hw_entries->num_entries; i++) {
-		hw_entry = &hw_entries->entries[i];
-		if (!strncmp(hw_entry->trap_name, hw_metadata->trap_name,
-			     NET_DM_MAX_HW_TRAP_NAME_LEN - 1)) {
-			hw_entry->count++;
-			goto out;
-		}
-	}
-	if (WARN_ON_ONCE(hw_entries->num_entries == dm_hit_limit))
-		goto out;
-
-	hw_entry = &hw_entries->entries[hw_entries->num_entries];
-	strlcpy(hw_entry->trap_name, hw_metadata->trap_name,
-		NET_DM_MAX_HW_TRAP_NAME_LEN - 1);
-	hw_entry->count = 1;
-	hw_entries->num_entries++;
-
-	if (!timer_pending(&hw_data->send_timer)) {
-		hw_data->send_timer.expires = jiffies + dm_delay * HZ;
-		add_timer(&hw_data->send_timer);
-	}
-
-out:
-	spin_unlock_irqrestore(&hw_data->lock, flags);
-}
-
 static void
 net_dm_hw_trap_summary_probe(void *ignore, const struct devlink *devlink,
 			     struct sk_buff *skb,
@@ -534,7 +489,6 @@ static const struct net_dm_alert_ops net_dm_alert_summary_ops = {
 	.napi_poll_probe	= trace_napi_poll_hit,
 	.work_item_func		= send_dm_alert,
 	.hw_work_item_func	= net_dm_hw_summary_work,
-	.hw_probe		= net_dm_hw_summary_probe,
 	.hw_trap_probe		= net_dm_hw_trap_summary_probe,
 };
 
@@ -866,54 +820,6 @@ static int net_dm_hw_packet_report_fill(struct sk_buff *msg,
 	return -EMSGSIZE;
 }
 
-static struct net_dm_hw_metadata *
-net_dm_hw_metadata_clone(const struct net_dm_hw_metadata *hw_metadata)
-{
-	const struct flow_action_cookie *fa_cookie;
-	struct net_dm_hw_metadata *n_hw_metadata;
-	const char *trap_group_name;
-	const char *trap_name;
-
-	n_hw_metadata = kzalloc(sizeof(*hw_metadata), GFP_ATOMIC);
-	if (!n_hw_metadata)
-		return NULL;
-
-	trap_group_name = kstrdup(hw_metadata->trap_group_name, GFP_ATOMIC);
-	if (!trap_group_name)
-		goto free_hw_metadata;
-	n_hw_metadata->trap_group_name = trap_group_name;
-
-	trap_name = kstrdup(hw_metadata->trap_name, GFP_ATOMIC);
-	if (!trap_name)
-		goto free_trap_group;
-	n_hw_metadata->trap_name = trap_name;
-
-	if (hw_metadata->fa_cookie) {
-		size_t cookie_size = sizeof(*fa_cookie) +
-				     hw_metadata->fa_cookie->cookie_len;
-
-		fa_cookie = kmemdup(hw_metadata->fa_cookie, cookie_size,
-				    GFP_ATOMIC);
-		if (!fa_cookie)
-			goto free_trap_name;
-		n_hw_metadata->fa_cookie = fa_cookie;
-	}
-
-	n_hw_metadata->input_dev = hw_metadata->input_dev;
-	if (n_hw_metadata->input_dev)
-		dev_hold(n_hw_metadata->input_dev);
-
-	return n_hw_metadata;
-
-free_trap_name:
-	kfree(trap_name);
-free_trap_group:
-	kfree(trap_group_name);
-free_hw_metadata:
-	kfree(n_hw_metadata);
-	return NULL;
-}
-
 static struct net_dm_hw_metadata *
 net_dm_hw_metadata_copy(const struct devlink_trap_metadata *metadata)
 {
@@ -1027,53 +933,6 @@ static void net_dm_hw_packet_work(struct work_struct *work)
 		net_dm_hw_packet_report(skb);
 }
 
-static void
-net_dm_hw_packet_probe(struct sk_buff *skb,
-		       const struct net_dm_hw_metadata *hw_metadata)
-{
-	struct net_dm_hw_metadata *n_hw_metadata;
-	ktime_t tstamp = ktime_get_real();
-	struct per_cpu_dm_data *hw_data;
-	struct sk_buff *nskb;
-	unsigned long flags;
-
-	if (!skb_mac_header_was_set(skb))
-		return;
-
-	nskb = skb_clone(skb, GFP_ATOMIC);
-	if (!nskb)
-		return;
-
-	n_hw_metadata = net_dm_hw_metadata_clone(hw_metadata);
-	if (!n_hw_metadata)
-		goto free;
-
-	NET_DM_SKB_CB(nskb)->hw_metadata = n_hw_metadata;
-	nskb->tstamp = tstamp;
-
-	hw_data = this_cpu_ptr(&dm_hw_cpu_data);
-
-	spin_lock_irqsave(&hw_data->drop_queue.lock, flags);
-	if (skb_queue_len(&hw_data->drop_queue) < net_dm_queue_len)
-		__skb_queue_tail(&hw_data->drop_queue, nskb);
-	else
-		goto unlock_free;
-	spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags);
-
-	schedule_work(&hw_data->dm_alert_work);
-
-	return;
-
-unlock_free:
-	spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags);
-	u64_stats_update_begin(&hw_data->stats.syncp);
-	hw_data->stats.dropped++;
-	u64_stats_update_end(&hw_data->stats.syncp);
-	net_dm_hw_metadata_free(n_hw_metadata);
-free:
-	consume_skb(nskb);
-}
-
 static void
 net_dm_hw_trap_packet_probe(void *ignore, const struct devlink *devlink,
 			    struct sk_buff *skb,
@@ -1127,7 +986,6 @@ static const struct net_dm_alert_ops net_dm_alert_packet_ops = {
 	.napi_poll_probe	= net_dm_packet_trace_napi_poll_hit,
 	.work_item_func		= net_dm_packet_work,
 	.hw_work_item_func	= net_dm_hw_packet_work,
-	.hw_probe		= net_dm_hw_packet_probe,
 	.hw_trap_probe		= net_dm_hw_trap_packet_probe,
 };