linux-kernel - [PATCH 4.19 88/95] bnxt_en: Fix accumulation of bp->net_stats

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Message-Id: <20200601174033.889824361@linuxfoundation.org>
Date:   Mon,  1 Jun 2020 19:54:28 +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,
        Vijayendra Suman <vijayendra.suman@...cle.com>,
        Michael Chan <michael.chan@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 88/95] bnxt_en: Fix accumulation of bp->net_stats_prev.

From: Michael Chan <michael.chan@...adcom.com>

commit b8056e8434b037fdab08158fea99ed7bc8ef3a74 upstream.

We have logic to maintain network counters across resets by storing
the counters in bp->net_stats_prev before reset.  But not all resets
will clear the counters.  Certain resets that don't need to change
the number of rings do not clear the counters.  The current logic
accumulates the counters before all resets, causing big jumps in
the counters after some resets, such as ethtool -G.

Fix it by only accumulating the counters during reset if the irq_re_init
parameter is set.  The parameter signifies that all rings and interrupts
will be reset and that means that the counters will also be reset.

Reported-by: Vijayendra Suman <vijayendra.suman@...cle.com>
Fixes: b8875ca356f1 ("bnxt_en: Save ring statistics before reset.")
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -7177,7 +7177,7 @@ static void __bnxt_close_nic(struct bnxt
 	bnxt_free_skbs(bp);

 	/* Save ring stats before shutdown */
-	if (bp->bnapi)
+	if (bp->bnapi && irq_re_init)
 		bnxt_get_ring_stats(bp, &bp->net_stats_prev);
 	if (irq_re_init) {
 		bnxt_free_irq(bp);