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From 5391a9ae3e19dbb7bd9d314271ec510177f9d8ca Mon Sep 17 00:00:00 2001
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From: Alaa Hleihel <ahleihel@redhat.com>
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Date: Tue, 12 May 2020 10:55:18 -0400
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Subject: [PATCH 202/312] [netdrv] net/mlx5e: Get the latest values from
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counters in switchdev mode
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Message-id: <20200512105530.4207-113-ahleihel@redhat.com>
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Patchwork-id: 306985
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Patchwork-instance: patchwork
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O-Subject: [RHEL8.3 BZ 1789382 112/124] net/mlx5e: Get the latest values from counters in switchdev mode
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Bugzilla: 1789382
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RH-Acked-by: Tony Camuso <tcamuso@redhat.com>
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RH-Acked-by: Kamal Heib <kheib@redhat.com>
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RH-Acked-by: Jarod Wilson <jarod@redhat.com>
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Bugzilla: http://bugzilla.redhat.com/1789382
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Upstream: v5.7-rc3
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commit dcdf4ce0ff4ba206fc362e149c8ae81d6a2f849c
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Author: Zhu Yanjun <yanjunz@mellanox.com>
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Date: Wed Apr 8 14:51:52 2020 +0800
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net/mlx5e: Get the latest values from counters in switchdev mode
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In the switchdev mode, when running "cat
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/sys/class/net/NIC/statistics/tx_packets", the ppcnt register is
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accessed to get the latest values. But currently this command can
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not get the correct values from ppcnt.
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From firmware manual, before getting the 802_3 counters, the 802_3
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data layout should be set to the ppcnt register.
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When the command "cat /sys/class/net/NIC/statistics/tx_packets" is
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run, before updating 802_3 data layout with ppcnt register, the
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monitor counters are tested. The test result will decide the
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802_3 data layout is updated or not.
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Actually the monitor counters do not support to monitor rx/tx
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stats of 802_3 in switchdev mode. So the rx/tx counters change
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will not trigger monitor counters. So the 802_3 data layout will
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not be updated in ppcnt register. Finally this command can not get
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the latest values from ppcnt register with 802_3 data layout.
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Fixes: 5c7e8bbb0257 ("net/mlx5e: Use monitor counters for update stats")
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Signed-off-by: Zhu Yanjun <yanjunz@mellanox.com>
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Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
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Signed-off-by: Alaa Hleihel <ahleihel@redhat.com>
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Signed-off-by: Frantisek Hrbata <fhrbata@redhat.com>
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---
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drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
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index 0d50ee4fd986..22298f67fbd2 100644
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--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
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+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
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@@ -3584,7 +3584,12 @@ mlx5e_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
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struct mlx5e_vport_stats *vstats = &priv->stats.vport;
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struct mlx5e_pport_stats *pstats = &priv->stats.pport;
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- if (!mlx5e_monitor_counter_supported(priv)) {
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+ /* In switchdev mode, monitor counters doesn't monitor
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+ * rx/tx stats of 802_3. The update stats mechanism
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+ * should keep the 802_3 layout counters updated
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+ */
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+ if (!mlx5e_monitor_counter_supported(priv) ||
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+ mlx5e_is_uplink_rep(priv)) {
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/* update HW stats in background for next time */
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mlx5e_queue_update_stats(priv);
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}
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--
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2.13.6
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