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net: ti: icssg-prueth: Fix tx_total_bytes count

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ICSSG HW stats on TX side considers 8 preamble bytes as data bytes. Due
to this the tx_bytes of ICSSG interface doesn't match the rx_bytes of the
link partner. There is no public errata available yet.

As a workaround to fix this, decrease tx_bytes by 8 bytes for every tx
frame.

Fixes: c1e10d5dc7 ("net: ti: icssg-prueth: Add ICSSG Stats")
Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
Link: https://lore.kernel.org/r/20231012064626.977466-1-danishanwar@ti.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
MD Danish Anwar 2023-10-12 12:16:26 +05:30 committed by Jakub Kicinski
parent a258c804aa
commit 2c0d808f36
1 changed files with 9 additions and 0 deletions
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9
drivers/net/ethernet/ti/icssg/icssg_stats.c
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@ -9,6 +9,9 @@
#include "icssg_stats.h"
#include <linux/regmap.h>
#define ICSSG_TX_PACKET_OFFSET 0xA0
#define ICSSG_TX_BYTE_OFFSET 0xEC
static u32 stats_base[] = { 0x54c, /* Slice 0 stats start */
0xb18, /* Slice 1 stats start */
};
@ -18,6 +21,7 @@ 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 +33,12 @@ void emac_update_hardware_stats(struct prueth_emac *emac)
base + icssg_all_stats[i].offset,
val);
if (icssg_all_stats[i].offset == ICSSG_TX_PACKET_OFFSET)
tx_pkt_cnt = val;
emac->stats[i] += val;
if (icssg_all_stats[i].offset == ICSSG_TX_BYTE_OFFSET)
emac->stats[i] -= tx_pkt_cnt * 8;
}
}