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devlink: Add a tracepoint for trap reports 

Add a tracepoint for trap reports so that drop monitor could register
its probe on it. Use trace_devlink_trap_report_enabled() to avoid
wasting cycles setting the trap metadata if the tracepoint is not
enabled.

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 11:15:50 +03:00 committed by David S. Miller
parent 8333c1c4ee
commit 5b88823bfe
3 changed files with 76 additions and 0 deletions
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14
include/net/devlink.h
View File

@ -624,6 +624,20 @@ struct devlink_health_reporter_ops {
struct netlink_ext_ack *extack);
};
/**
* struct devlink_trap_metadata - Packet trap metadata.
* @trap_name: Trap name.
* @trap_group_name: Trap group name.
* @input_dev: Input netdevice.
* @fa_cookie: Flow action user cookie.
*/
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;
};
/**
* struct devlink_trap_policer - Immutable packet trap policer attributes.
* @id: Policer identifier.

37
include/trace/events/devlink.h
View File

@ -171,6 +171,43 @@ TRACE_EVENT(devlink_health_reporter_state_update,
__entry->new_state)
);
/*
* Tracepoint for devlink packet trap:
*/
TRACE_EVENT(devlink_trap_report,
TP_PROTO(const struct devlink *devlink, struct sk_buff *skb,
const struct devlink_trap_metadata *metadata),
TP_ARGS(devlink, skb, metadata),
TP_STRUCT__entry(
__string(bus_name, devlink->dev->bus->name)
__string(dev_name, dev_name(devlink->dev))
__string(driver_name, devlink->dev->driver->name)
__string(trap_name, metadata->trap_name)
__string(trap_group_name, metadata->trap_group_name)
__dynamic_array(char, input_dev_name, IFNAMSIZ)
),
TP_fast_assign(
struct net_device *input_dev = metadata->input_dev;
__assign_str(bus_name, devlink->dev->bus->name);
__assign_str(dev_name, dev_name(devlink->dev));
__assign_str(driver_name, devlink->dev->driver->name);
__assign_str(trap_name, metadata->trap_name);
__assign_str(trap_group_name, metadata->trap_group_name);
__assign_str(input_dev_name,
(input_dev ? input_dev->name : "NULL"));
),
TP_printk("bus_name=%s dev_name=%s driver_name=%s trap_name=%s "
"trap_group_name=%s input_dev_name=%s", __get_str(bus_name),
__get_str(dev_name), __get_str(driver_name),
__get_str(trap_name), __get_str(trap_group_name),
__get_str(input_dev_name))
);
#endif /* _TRACE_DEVLINK_H */
/* This part must be outside protection */

25
net/core/devlink.c
View File

@ -84,6 +84,7 @@ EXPORT_SYMBOL(devlink_dpipe_header_ipv6);
EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_hwmsg);
EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_hwerr);
EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_trap_report);
static const struct nla_policy devlink_function_nl_policy[DEVLINK_PORT_FUNCTION_ATTR_MAX + 1] = {
[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR] = { .type = NLA_BINARY },
@ -9278,6 +9279,22 @@ devlink_trap_report_metadata_fill(struct net_dm_hw_metadata *hw_metadata,
spin_unlock(&in_devlink_port->type_lock);
}
static void
devlink_trap_report_metadata_set(struct devlink_trap_metadata *metadata,
const struct devlink_trap_item *trap_item,
struct devlink_port *in_devlink_port,
const struct flow_action_cookie *fa_cookie)
{
metadata->trap_name = trap_item->trap->name;
metadata->trap_group_name = trap_item->group_item->group->name;
metadata->fa_cookie = fa_cookie;
spin_lock(&in_devlink_port->type_lock);
if (in_devlink_port->type == DEVLINK_PORT_TYPE_ETH)
metadata->input_dev = in_devlink_port->type_dev;
spin_unlock(&in_devlink_port->type_lock);
}
/**
* devlink_trap_report - Report trapped packet to drop monitor.
* @devlink: devlink.
@ -9307,6 +9324,14 @@ void devlink_trap_report(struct devlink *devlink, struct sk_buff *skb,
devlink_trap_report_metadata_fill(&hw_metadata, trap_item,
in_devlink_port, fa_cookie);
net_dm_hw_report(skb, &hw_metadata);
if (trace_devlink_trap_report_enabled()) {
struct devlink_trap_metadata metadata = {};
devlink_trap_report_metadata_set(&metadata, trap_item,
in_devlink_port, fa_cookie);
trace_devlink_trap_report(devlink, skb, &metadata);
}
}
EXPORT_SYMBOL_GPL(devlink_trap_report);