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2c0d808f36
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>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Texas Instruments ICSSG Ethernet driver
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*
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* Copyright (C) 2018-2021 Texas Instruments Incorporated - https://www.ti.com/
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*
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*/
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#include "icssg_prueth.h"
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#include "icssg_stats.h"
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#include <linux/regmap.h>
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#define ICSSG_TX_PACKET_OFFSET 0xA0
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#define ICSSG_TX_BYTE_OFFSET 0xEC
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static u32 stats_base[] = { 0x54c, /* Slice 0 stats start */
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0xb18, /* Slice 1 stats start */
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};
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void emac_update_hardware_stats(struct prueth_emac *emac)
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{
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struct prueth *prueth = emac->prueth;
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int slice = prueth_emac_slice(emac);
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u32 base = stats_base[slice];
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u32 tx_pkt_cnt = 0;
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u32 val;
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int i;
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for (i = 0; i < ARRAY_SIZE(icssg_all_stats); i++) {
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regmap_read(prueth->miig_rt,
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base + icssg_all_stats[i].offset,
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&val);
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regmap_write(prueth->miig_rt,
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base + icssg_all_stats[i].offset,
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val);
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if (icssg_all_stats[i].offset == ICSSG_TX_PACKET_OFFSET)
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tx_pkt_cnt = val;
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emac->stats[i] += val;
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if (icssg_all_stats[i].offset == ICSSG_TX_BYTE_OFFSET)
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emac->stats[i] -= tx_pkt_cnt * 8;
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}
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}
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void emac_stats_work_handler(struct work_struct *work)
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{
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struct prueth_emac *emac = container_of(work, struct prueth_emac,
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stats_work.work);
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emac_update_hardware_stats(emac);
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queue_delayed_work(system_long_wq, &emac->stats_work,
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msecs_to_jiffies((STATS_TIME_LIMIT_1G_MS * 1000) / emac->speed));
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}
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int emac_get_stat_by_name(struct prueth_emac *emac, char *stat_name)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(icssg_all_stats); i++) {
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if (!strcmp(icssg_all_stats[i].name, stat_name))
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return emac->stats[icssg_all_stats[i].offset / sizeof(u32)];
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}
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netdev_err(emac->ndev, "Invalid stats %s\n", stat_name);
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return -EINVAL;
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}
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