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Message-ID: <20231011063700.1824093-1-danishanwar@ti.com>
Date: Wed, 11 Oct 2023 12:07:00 +0530
From: MD Danish Anwar <danishanwar@...com>
To: MD Danish Anwar <danishanwar@...com>, Paolo Abeni <pabeni@...hat.com>,
Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
"David
S. Miller" <davem@...emloft.net>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>, <srk@...com>,
Vignesh Raghavendra <vigneshr@...com>, <r-gunasekaran@...com>,
Roger Quadros
<rogerq@...nel.org>
Subject: [PATCH] net: ti: icssg-prueth: Fix tx_total_bytes count
ICSSG HW stats on TX side considers 8 preamble bytes as data bytes. Due
to this the tx_total_bytes of one interface doesn't match the
rx_total_bytes of other interface when two ICSSG interfaces are
connected with each other. There is no public errata available yet.
As a workaround to fix this, decrease tx_total_bytes by 8 bytes for every
tx frame.
Fixes: c1e10d5dc7a1 ("net: ti: icssg-prueth: Add ICSSG Stats")
Signed-off-by: MD Danish Anwar <danishanwar@...com>
---
drivers/net/ethernet/ti/icssg/icssg_stats.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/ti/icssg/icssg_stats.c b/drivers/net/ethernet/ti/icssg/icssg_stats.c
index bb0b33927e3b..dc12edcbac02 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_stats.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_stats.c
@@ -18,6 +18,7 @@ void emac_update_hardware_stats(struct prueth_emac *emac)
struct prueth *prueth = emac->prueth;
int slice = prueth_emac_slice(emac);
u32 base = stats_base[slice];
+ u32 tx_pkt_cnt = 0;
u32 val;
int i;
@@ -29,7 +30,12 @@ void emac_update_hardware_stats(struct prueth_emac *emac)
base + icssg_all_stats[i].offset,
val);
+ if (!strncmp(icssg_ethtool_stats[i].name, "tx_good_frames", ETH_GSTRING_LEN))
+ tx_pkt_cnt = val;
+
emac->stats[i] += val;
+ if (!strncmp(icssg_ethtool_stats[i].name, "tx_total_bytes", ETH_GSTRING_LEN))
+ emac->stats[i] -= tx_pkt_cnt * 8;
}
}
--
2.34.1
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