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net: core: devlink: add dropped stats traps field

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Whenever query statistics is issued for trap, devlink subsystem
would also fill-in statistics 'dropped' field. This field indicates
the number of packets HW dropped and failed to report to the device driver,
and thus - to the devlink subsystem itself.
In case if device driver didn't register callback for hard drop
statistics querying, 'dropped' field will be omitted and not filled.

Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oleksandr Mazur 2021-06-14 16:01:12 +03:00 • committed by David S. Miller
parent ea99750e40
commit ddee9dbc3d
2 changed files with 59 additions and 4 deletions
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10
include/net/devlink.h
View file

@ -1347,6 +1347,16 @@ struct devlink_ops {
const struct devlink_trap_group *group, const struct devlink_trap_group *group,
enum devlink_trap_action action, enum devlink_trap_action action,
struct netlink_ext_ack *extack); struct netlink_ext_ack *extack);
/**
* @trap_drop_counter_get: Trap drop counter get function.
*
* Should be used by device drivers to report number of packets
* that have been dropped, and cannot be passed to the devlink
* subsystem by the underlying device.
*/
int (*trap_drop_counter_get)(struct devlink *devlink,
const struct devlink_trap *trap,
u64 *p_drops);
/** /**
* @trap_policer_init: Trap policer initialization function. * @trap_policer_init: Trap policer initialization function.
* *

53
net/core/devlink.c
View file

@ -7519,8 +7519,9 @@ static void devlink_trap_stats_read(struct devlink_stats __percpu *trap_stats,
} }
} }
static int devlink_trap_stats_put(struct sk_buff *msg, static int
struct devlink_stats __percpu *trap_stats) devlink_trap_group_stats_put(struct sk_buff *msg,
struct devlink_stats __percpu *trap_stats)
{ {
struct devlink_stats stats; struct devlink_stats stats;
struct nlattr *attr; struct nlattr *attr;
@ -7548,6 +7549,50 @@ nla_put_failure:
return -EMSGSIZE; return -EMSGSIZE;
} }
static int devlink_trap_stats_put(struct sk_buff *msg, struct devlink *devlink,
const struct devlink_trap_item *trap_item)
{
struct devlink_stats stats;
struct nlattr *attr;
u64 drops = 0;
int err;
if (devlink->ops->trap_drop_counter_get) {
err = devlink->ops->trap_drop_counter_get(devlink,
trap_item->trap,
&drops);
if (err)
return err;
}
devlink_trap_stats_read(trap_item->stats, &stats);
attr = nla_nest_start(msg, DEVLINK_ATTR_STATS);
if (!attr)
return -EMSGSIZE;
if (devlink->ops->trap_drop_counter_get &&
nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_DROPPED, drops,
DEVLINK_ATTR_PAD))
goto nla_put_failure;
if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_PACKETS,
stats.rx_packets, DEVLINK_ATTR_PAD))
goto nla_put_failure;
if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_BYTES,
stats.rx_bytes, DEVLINK_ATTR_PAD))
goto nla_put_failure;
nla_nest_end(msg, attr);
return 0;
nla_put_failure:
nla_nest_cancel(msg, attr);
return -EMSGSIZE;
}
static int devlink_nl_trap_fill(struct sk_buff *msg, struct devlink *devlink, static int devlink_nl_trap_fill(struct sk_buff *msg, struct devlink *devlink,
const struct devlink_trap_item *trap_item, const struct devlink_trap_item *trap_item,
enum devlink_command cmd, u32 portid, u32 seq, enum devlink_command cmd, u32 portid, u32 seq,
@ -7585,7 +7630,7 @@ static int devlink_nl_trap_fill(struct sk_buff *msg, struct devlink *devlink,
if (err) if (err)
goto nla_put_failure; goto nla_put_failure;
err = devlink_trap_stats_put(msg, trap_item->stats); err = devlink_trap_stats_put(msg, devlink, trap_item);
if (err) if (err)
goto nla_put_failure; goto nla_put_failure;
@ -7802,7 +7847,7 @@ devlink_nl_trap_group_fill(struct sk_buff *msg, struct devlink *devlink,
group_item->policer_item->policer->id)) group_item->policer_item->policer->id))
goto nla_put_failure; goto nla_put_failure;
err = devlink_trap_stats_put(msg, group_item->stats); err = devlink_trap_group_stats_put(msg, group_item->stats);
if (err) if (err)
goto nla_put_failure; goto nla_put_failure;