linux-kernel - [PATCH 5.15 099/179] iavf: Fix refreshing iavf adapter stats on ethtool request

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Message-Id: <20211129181722.188359843@linuxfoundation.org>
Date:   Mon, 29 Nov 2021 19:18:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jan Sokolowski <jan.sokolowski@...el.com>,
        Jedrzej Jagielski <jedrzej.jagielski@...el.com>,
        Konrad Jankowski <konrad0.jankowski@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 099/179] iavf: Fix refreshing iavf adapter stats on ethtool request

From: Jedrzej Jagielski <jedrzej.jagielski@...el.com>

[ Upstream commit 3b5bdd18eb76e7570d9bacbcab6828a9b26ae121 ]

Currently iavf adapter statistics are refreshed only in a
watchdog task, triggered approximately every two seconds,
which causes some ethtool requests to return outdated values.

Add explicit statistics refresh when requested by ethtool -S.

Fixes: b476b0030e61 ("iavf: Move commands processing to the separate function")
Signed-off-by: Jan Sokolowski <jan.sokolowski@...el.com>
Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@...el.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/intel/iavf/iavf.h         |  2 ++
 drivers/net/ethernet/intel/iavf/iavf_ethtool.c |  3 +++
 drivers/net/ethernet/intel/iavf/iavf_main.c    | 18 ++++++++++++++++++
 .../net/ethernet/intel/iavf/iavf_virtchnl.c    |  2 ++
 4 files changed, 25 insertions(+)

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index 46312a4415baf..dd81698f0d596 100644
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -305,6 +305,7 @@ struct iavf_adapter {
 #define IAVF_FLAG_AQ_DEL_FDIR_FILTER		BIT(26)
 #define IAVF_FLAG_AQ_ADD_ADV_RSS_CFG		BIT(27)
 #define IAVF_FLAG_AQ_DEL_ADV_RSS_CFG		BIT(28)
+#define IAVF_FLAG_AQ_REQUEST_STATS		BIT(29)
 
 	/* OS defined structs */
 	struct net_device *netdev;
@@ -398,6 +399,7 @@ int iavf_up(struct iavf_adapter *adapter);
 void iavf_down(struct iavf_adapter *adapter);
 int iavf_process_config(struct iavf_adapter *adapter);
 void iavf_schedule_reset(struct iavf_adapter *adapter);
+void iavf_schedule_request_stats(struct iavf_adapter *adapter);
 void iavf_reset(struct iavf_adapter *adapter);
 void iavf_set_ethtool_ops(struct net_device *netdev);
 void iavf_update_stats(struct iavf_adapter *adapter);
diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index 71b23922089fb..0cecaff38d042 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -354,6 +354,9 @@ static void iavf_get_ethtool_stats(struct net_device *netdev,
 	struct iavf_adapter *adapter = netdev_priv(netdev);
 	unsigned int i;
 
+	/* Explicitly request stats refresh */
+	iavf_schedule_request_stats(adapter);
+
 	iavf_add_ethtool_stats(&data, adapter, iavf_gstrings_stats);
 
 	rcu_read_lock();
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index aaf8a2f396e46..5173b6293c6d9 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -165,6 +165,19 @@ void iavf_schedule_reset(struct iavf_adapter *adapter)
 	}
 }
 
+/**
+ * iavf_schedule_request_stats - Set the flags and schedule statistics request
+ * @adapter: board private structure
+ *
+ * Sets IAVF_FLAG_AQ_REQUEST_STATS flag so iavf_watchdog_task() will explicitly
+ * request and refresh ethtool stats
+ **/
+void iavf_schedule_request_stats(struct iavf_adapter *adapter)
+{
+	adapter->aq_required |= IAVF_FLAG_AQ_REQUEST_STATS;
+	mod_delayed_work(iavf_wq, &adapter->watchdog_task, 0);
+}
+
 /**
  * iavf_tx_timeout - Respond to a Tx Hang
  * @netdev: network interface device structure
@@ -1700,6 +1713,11 @@ static int iavf_process_aq_command(struct iavf_adapter *adapter)
 		iavf_del_adv_rss_cfg(adapter);
 		return 0;
 	}
+	if (adapter->aq_required & IAVF_FLAG_AQ_REQUEST_STATS) {
+		iavf_request_stats(adapter);
+		return 0;
+	}
+
 	return -EAGAIN;
 }
 
diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 3c735968e1b85..33bde032ca37e 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -784,6 +784,8 @@ void iavf_request_stats(struct iavf_adapter *adapter)
 		/* no error message, this isn't crucial */
 		return;
 	}
+
+	adapter->aq_required &= ~IAVF_FLAG_AQ_REQUEST_STATS;
 	adapter->current_op = VIRTCHNL_OP_GET_STATS;
 	vqs.vsi_id = adapter->vsi_res->vsi_id;
 	/* queue maps are ignored for this message - only the vsi is used */
-- 
2.33.0