From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756604AbeDZUhs (ORCPT ); Thu, 26 Apr 2018 16:37:48 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:47434 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753393AbeDZUhq (ORCPT ); Thu, 26 Apr 2018 16:37:46 -0400 From: Qing Huang To: linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org Cc: leon@kernel.org, matanb@mellanox.com, saeedm@mellanox.com, Qing Huang Subject: [PATCH] net/mlx5: report persistent netdev stats across ifdown/ifup commands Date: Thu, 26 Apr 2018 13:37:37 -0700 Message-Id: <1524775057-8012-1-git-send-email-qing.huang@oracle.com> X-Mailer: git-send-email 1.8.3.1 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8875 signatures=668698 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=948 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1804260191 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Current stats collecting scheme in mlx5 driver is to periodically fetch aggregated stats from all the active mlx5 software channels associated with the device. However when a mlx5 interface is brought down(ifdown), all the channels will be deactivated and closed. A new set of channels will be created when next ifup command or a similar command is called. Unfortunately the new channels will have all stats reset to 0. So you lose the accumulated stats information. This behavior is different from other netdev drivers including the mlx4 driver. In order to fix it, we now save prior mlx5 software stats into netdev stats fields, so all the accumulated stats will survive multiple runs of ifdown/ifup commands and be shown correctly. Orabug: 27548610 Signed-off-by: Qing Huang --- drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 30 +++++++++++++++++++---- 1 file changed, 25 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c index f1fe490..5d50e69 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c @@ -2621,6 +2621,23 @@ static void mlx5e_netdev_set_tcs(struct net_device *netdev) netdev_set_tc_queue(netdev, tc, nch, 0); } +static void mlx5e_netdev_save_stats(struct mlx5e_priv *priv) +{ + struct net_device *netdev = priv->netdev; + + netdev->stats.rx_packets += priv->stats.sw.rx_packets; + netdev->stats.rx_bytes += priv->stats.sw.rx_bytes; + netdev->stats.tx_packets += priv->stats.sw.tx_packets; + netdev->stats.tx_bytes += priv->stats.sw.tx_bytes; + netdev->stats.tx_dropped += priv->stats.sw.tx_queue_dropped; + + priv->stats.sw.rx_packets = 0; + priv->stats.sw.rx_bytes = 0; + priv->stats.sw.tx_packets = 0; + priv->stats.sw.tx_bytes = 0; + priv->stats.sw.tx_queue_dropped = 0; +} + static void mlx5e_build_channels_tx_maps(struct mlx5e_priv *priv) { struct mlx5e_channel *c; @@ -2691,6 +2708,7 @@ void mlx5e_switch_priv_channels(struct mlx5e_priv *priv, netif_set_real_num_tx_queues(netdev, new_num_txqs); mlx5e_deactivate_priv_channels(priv); + mlx5e_netdev_save_stats(priv); mlx5e_close_channels(&priv->channels); priv->channels = *new_chs; @@ -2770,6 +2788,7 @@ int mlx5e_close_locked(struct net_device *netdev) netif_carrier_off(priv->netdev); mlx5e_deactivate_priv_channels(priv); + mlx5e_netdev_save_stats(priv); mlx5e_close_channels(&priv->channels); return 0; @@ -3215,11 +3234,12 @@ static int mlx5e_setup_tc(struct net_device *dev, enum tc_setup_type type, stats->tx_packets = PPORT_802_3_GET(pstats, a_frames_transmitted_ok); stats->tx_bytes = PPORT_802_3_GET(pstats, a_octets_transmitted_ok); } else { - stats->rx_packets = sstats->rx_packets; - stats->rx_bytes = sstats->rx_bytes; - stats->tx_packets = sstats->tx_packets; - stats->tx_bytes = sstats->tx_bytes; - stats->tx_dropped = sstats->tx_queue_dropped; + stats->rx_packets = sstats->rx_packets + dev->stats.rx_packets; + stats->rx_bytes = sstats->rx_bytes + dev->stats.rx_bytes; + stats->tx_packets = sstats->tx_packets + dev->stats.tx_packets; + stats->tx_bytes = sstats->tx_bytes + dev->stats.tx_bytes; + stats->tx_dropped = sstats->tx_queue_dropped + + dev->stats.tx_dropped; } stats->rx_dropped = priv->stats.qcnt.rx_out_of_buffer; -- 1.8.3.1