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mlxsw: spectrum: Support RED xstats

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Add support for ndo_setup_tc with enum tc_setup_type value of
TC_SETUP_RED_XSTATS. This call returns the RED qdisc xstats from the cache
if the handle ID that is asked for matching the root qdisc ID and fails
otherwise.

Signed-off-by: Nogah Frankel <nogahf@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nogah Frankel 2017-11-06 07:23:48 +01:00 committed by David S. Miller
parent 075ab8adaf
commit 861fb8294d
2 changed files with 60 additions and 0 deletions
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9
drivers/net/ethernet/mellanox/mlxsw/spectrum.h
View File

@ -48,6 +48,7 @@
#include <linux/notifier.h>
#include <net/psample.h>
#include <net/pkt_cls.h>
#include <net/red.h>
#include "port.h"
#include "core.h"
@ -211,6 +212,14 @@ enum mlxsw_sp_qdisc_type {
struct mlxsw_sp_qdisc {
u32 handle;
enum mlxsw_sp_qdisc_type type;
struct red_stats xstats_base;
union {
struct {
u64 tail_drop_base;
u64 ecn_base;
u64 wred_drop_base;
} red;
} xstats;
};
/* No need an internal lock; At worse - miss a single periodic iteration */

51
drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
View File

@ -36,6 +36,7 @@
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <net/pkt_cls.h>
#include <net/red.h>
#include "spectrum.h"
#include "reg.h"
@ -77,6 +78,27 @@ mlxsw_sp_tclass_congestion_disable(struct mlxsw_sp_port *mlxsw_sp_port,
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(cwtpm), cwtpm_cmd);
}
static void
mlxsw_sp_setup_tc_qdisc_clean_stats(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
int tclass_num)
{
struct red_stats *xstats_base = &mlxsw_sp_qdisc->xstats_base;
struct mlxsw_sp_port_xstats *xstats;
xstats = &mlxsw_sp_port->periodic_hw_stats.xstats;
switch (mlxsw_sp_qdisc->type) {
case MLXSW_SP_QDISC_RED:
xstats_base->prob_mark = xstats->ecn;
xstats_base->prob_drop = xstats->wred_drop[tclass_num];
xstats_base->pdrop = xstats->tail_drop[tclass_num];
break;
default:
break;
}
}
static int
mlxsw_sp_qdisc_red_destroy(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
@ -135,6 +157,11 @@ mlxsw_sp_qdisc_red_replace(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
goto err_config;
mlxsw_sp_qdisc->type = MLXSW_SP_QDISC_RED;
if (mlxsw_sp_qdisc->handle != handle)
mlxsw_sp_setup_tc_qdisc_clean_stats(mlxsw_sp_port,
mlxsw_sp_qdisc,
tclass_num);
mlxsw_sp_qdisc->handle = handle;
return 0;
@ -146,6 +173,26 @@ err_config:
return err;
}
static int
mlxsw_sp_qdisc_get_red_xstats(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
int tclass_num, struct red_stats *res)
{
struct red_stats *xstats_base = &mlxsw_sp_qdisc->xstats_base;
struct mlxsw_sp_port_xstats *xstats;
if (mlxsw_sp_qdisc->handle != handle ||
mlxsw_sp_qdisc->type != MLXSW_SP_QDISC_RED)
return -EOPNOTSUPP;
xstats = &mlxsw_sp_port->periodic_hw_stats.xstats;
res->prob_drop = xstats->wred_drop[tclass_num] - xstats_base->prob_drop;
res->prob_mark = xstats->ecn - xstats_base->prob_mark;
res->pdrop = xstats->tail_drop[tclass_num] - xstats_base->pdrop;
return 0;
}
#define MLXSW_SP_PORT_DEFAULT_TCLASS 0
int mlxsw_sp_setup_tc_red(struct mlxsw_sp_port *mlxsw_sp_port,
@ -168,6 +215,10 @@ int mlxsw_sp_setup_tc_red(struct mlxsw_sp_port *mlxsw_sp_port,
case TC_RED_DESTROY:
return mlxsw_sp_qdisc_red_destroy(mlxsw_sp_port, p->handle,
mlxsw_sp_qdisc, tclass_num);
case TC_RED_XSTATS:
return mlxsw_sp_qdisc_get_red_xstats(mlxsw_sp_port, p->handle,
mlxsw_sp_qdisc, tclass_num,
p->xstats);
default:
return -EOPNOTSUPP;
}