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drop_monitor: Filter control packets in drop monitor 

Previously, devlink called into drop monitor in order to report hardware
originated drops / exceptions. devlink intentionally filtered control
packets and did not pass them to drop monitor as they were not dropped
by the underlying hardware.

Now drop monitor registers its probe on a generic 'devlink_trap_report'
tracepoint and should therefore perform this filtering itself instead of
having devlink do that.

Add the trap type as metadata and have drop monitor ignore control
packets.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2020-09-29 11:15:55 +03:00 committed by David S. Miller
parent a848c05f4b
commit 93e155967c
3 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/devlink.h
View File

@ -630,12 +630,14 @@ struct devlink_health_reporter_ops {
* @trap_group_name: Trap group name.
* @input_dev: Input netdevice.
* @fa_cookie: Flow action user cookie.
* @trap_type: Trap type.
*/
struct devlink_trap_metadata {
const char *trap_name;
const char *trap_group_name;
struct net_device *input_dev;
const struct flow_action_cookie *fa_cookie;
enum devlink_trap_type trap_type;
};
/**

8
net/core/devlink.c
View File

@ -9269,6 +9269,7 @@ devlink_trap_report_metadata_set(struct devlink_trap_metadata *metadata,
metadata->trap_name = trap_item->trap->name;
metadata->trap_group_name = trap_item->group_item->group->name;
metadata->fa_cookie = fa_cookie;
metadata->trap_type = trap_item->trap->type;
spin_lock(&in_devlink_port->type_lock);
if (in_devlink_port->type == DEVLINK_PORT_TYPE_ETH)
@ -9294,13 +9295,6 @@ void devlink_trap_report(struct devlink *devlink, struct sk_buff *skb,
devlink_trap_stats_update(trap_item->stats, skb->len);
devlink_trap_stats_update(trap_item->group_item->stats, skb->len);
/* Control packets were not dropped by the device or encountered an
* exception during forwarding and therefore should not be reported to
* the kernel's drop monitor.
*/
if (trap_item->trap->type == DEVLINK_TRAP_TYPE_CONTROL)
return;
if (trace_devlink_trap_report_enabled()) {
struct devlink_trap_metadata metadata = {};

6
net/core/drop_monitor.c
View File

@ -444,6 +444,9 @@ net_dm_hw_trap_summary_probe(void *ignore, const struct devlink *devlink,
unsigned long flags;
int i;
if (metadata->trap_type == DEVLINK_TRAP_TYPE_CONTROL)
return;
hw_data = this_cpu_ptr(&dm_hw_cpu_data);
spin_lock_irqsave(&hw_data->lock, flags);
hw_entries = hw_data->hw_entries;
@ -937,6 +940,9 @@ net_dm_hw_trap_packet_probe(void *ignore, const struct devlink *devlink,
struct sk_buff *nskb;
unsigned long flags;
if (metadata->trap_type == DEVLINK_TRAP_TYPE_CONTROL)
return;
if (!skb_mac_header_was_set(skb))
return;