linux-kernel - [PATCH 5.6 09/41] nfp: flower: fix used time of merge flow statistics

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Message-Id: <20200609174113.004985779@linuxfoundation.org>
Date:   Tue,  9 Jun 2020 19:45:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Heinrich Kuhn <heinrich.kuhn@...ronome.com>,
        Simon Horman <simon.horman@...ronome.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.6 09/41] nfp: flower: fix used time of merge flow statistics

From: Heinrich Kuhn <heinrich.kuhn@...ronome.com>

[ Upstream commit 5b186cd60f033110960a3db424ffbd6de4cee528 ]

Prior to this change the correct value for the used counter is calculated
but not stored nor, therefore, propagated to user-space. In use-cases such
as OVS use-case at least this results in active flows being removed from
the hardware datapath. Which results in both unnecessary flow tear-down
and setup, and packet processing on the host.

This patch addresses the problem by saving the calculated used value
which allows the value to propagate to user-space.

Found by inspection.

Fixes: aa6ce2ea0c93 ("nfp: flower: support stats update for merge flows")
Signed-off-by: Heinrich Kuhn <heinrich.kuhn@...ronome.com>
Signed-off-by: Simon Horman <simon.horman@...ronome.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/netronome/nfp/flower/offload.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -1440,7 +1440,8 @@ __nfp_flower_update_merge_stats(struct n
 		ctx_id = be32_to_cpu(sub_flow->meta.host_ctx_id);
 		priv->stats[ctx_id].pkts += pkts;
 		priv->stats[ctx_id].bytes += bytes;
-		max_t(u64, priv->stats[ctx_id].used, used);
+		priv->stats[ctx_id].used = max_t(u64, used,
+						 priv->stats[ctx_id].used);
 	}
 }