[PATCH can-next v3 15/20] can: rockchip_canfd: add stats support for errata workarounds
Marc Kleine-Budde
mkl at pengutronix.de
Fri Aug 30 12:26:12 PDT 2024
The driver contains workarounds for some of the rk3568v2 errata. Add
ethtool-based statistics ("ethtool -S") to track how often an erratum
workaround was needed.
Signed-off-by: Marc Kleine-Budde <mkl at pengutronix.de>
---
drivers/net/can/rockchip/Makefile | 1 +
drivers/net/can/rockchip/rockchip_canfd-core.c | 2 +
drivers/net/can/rockchip/rockchip_canfd-ethtool.c | 73 +++++++++++++++++++++++
drivers/net/can/rockchip/rockchip_canfd-rx.c | 13 +++-
drivers/net/can/rockchip/rockchip_canfd.h | 14 +++++
5 files changed, 102 insertions(+), 1 deletion(-)
diff --git a/drivers/net/can/rockchip/Makefile b/drivers/net/can/rockchip/Makefile
index 4eb7c50d8d5b..3760d3e1baa3 100644
--- a/drivers/net/can/rockchip/Makefile
+++ b/drivers/net/can/rockchip/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_CAN_ROCKCHIP_CANFD) += rockchip_canfd.o
rockchip_canfd-objs :=
rockchip_canfd-objs += rockchip_canfd-core.o
+rockchip_canfd-objs += rockchip_canfd-ethtool.o
rockchip_canfd-objs += rockchip_canfd-rx.o
rockchip_canfd-objs += rockchip_canfd-timestamp.o
rockchip_canfd-objs += rockchip_canfd-tx.o
diff --git a/drivers/net/can/rockchip/rockchip_canfd-core.c b/drivers/net/can/rockchip/rockchip_canfd-core.c
index cf176180a282..4db552bfc4db 100644
--- a/drivers/net/can/rockchip/rockchip_canfd-core.c
+++ b/drivers/net/can/rockchip/rockchip_canfd-core.c
@@ -800,6 +800,8 @@ static int rkcanfd_register(struct rkcanfd_priv *priv)
if (err)
goto out_pm_runtime_disable;
+ rkcanfd_ethtool_init(priv);
+
err = register_candev(ndev);
if (err)
goto out_pm_runtime_put_sync;
diff --git a/drivers/net/can/rockchip/rockchip_canfd-ethtool.c b/drivers/net/can/rockchip/rockchip_canfd-ethtool.c
new file mode 100644
index 000000000000..0084f37b2b9f
--- /dev/null
+++ b/drivers/net/can/rockchip/rockchip_canfd-ethtool.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2023, 2024 Pengutronix,
+// Marc Kleine-Budde <kernel at pengutronix.de>
+//
+
+#include <linux/ethtool.h>
+
+#include "rockchip_canfd.h"
+
+enum rkcanfd_stats_type {
+ RKCANFD_STATS_TYPE_RX_FIFO_EMPTY_ERRORS,
+ RKCANFD_STATS_TYPE_TX_EXTENDED_AS_STANDARD_ERRORS,
+};
+
+static const char rkcanfd_stats_strings[][ETH_GSTRING_LEN] = {
+ [RKCANFD_STATS_TYPE_RX_FIFO_EMPTY_ERRORS] = "rx_fifo_empty_errors",
+ [RKCANFD_STATS_TYPE_TX_EXTENDED_AS_STANDARD_ERRORS] = "tx_extended_as_standard_errors",
+};
+
+static void
+rkcanfd_ethtool_get_strings(struct net_device *ndev, u32 stringset, u8 *buf)
+{
+ switch (stringset) {
+ case ETH_SS_STATS:
+ memcpy(buf, rkcanfd_stats_strings,
+ sizeof(rkcanfd_stats_strings));
+ }
+}
+
+static int rkcanfd_ethtool_get_sset_count(struct net_device *netdev, int sset)
+{
+ switch (sset) {
+ case ETH_SS_STATS:
+ return ARRAY_SIZE(rkcanfd_stats_strings);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static void
+rkcanfd_ethtool_get_ethtool_stats(struct net_device *ndev,
+ struct ethtool_stats *stats, u64 *data)
+{
+ struct rkcanfd_priv *priv = netdev_priv(ndev);
+ struct rkcanfd_stats *rkcanfd_stats;
+ unsigned int start;
+
+ rkcanfd_stats = &priv->stats;
+
+ do {
+ start = u64_stats_fetch_begin(&rkcanfd_stats->syncp);
+
+ data[RKCANFD_STATS_TYPE_RX_FIFO_EMPTY_ERRORS] =
+ u64_stats_read(&rkcanfd_stats->rx_fifo_empty_errors);
+ data[RKCANFD_STATS_TYPE_TX_EXTENDED_AS_STANDARD_ERRORS] =
+ u64_stats_read(&rkcanfd_stats->tx_extended_as_standard_errors);
+ } while (u64_stats_fetch_retry(&rkcanfd_stats->syncp, start));
+}
+
+static const struct ethtool_ops rkcanfd_ethtool_ops = {
+ .get_ts_info = ethtool_op_get_ts_info,
+ .get_strings = rkcanfd_ethtool_get_strings,
+ .get_sset_count = rkcanfd_ethtool_get_sset_count,
+ .get_ethtool_stats = rkcanfd_ethtool_get_ethtool_stats,
+};
+
+void rkcanfd_ethtool_init(struct rkcanfd_priv *priv)
+{
+ priv->ndev->ethtool_ops = &rkcanfd_ethtool_ops;
+
+ u64_stats_init(&priv->stats.syncp);
+}
diff --git a/drivers/net/can/rockchip/rockchip_canfd-rx.c b/drivers/net/can/rockchip/rockchip_canfd-rx.c
index eff08948840c..9f72483dab18 100644
--- a/drivers/net/can/rockchip/rockchip_canfd-rx.c
+++ b/drivers/net/can/rockchip/rockchip_canfd-rx.c
@@ -96,6 +96,7 @@ static int rkcanfd_rxstx_filter(struct rkcanfd_priv *priv,
bool *tx_done)
{
struct net_device_stats *stats = &priv->ndev->stats;
+ struct rkcanfd_stats *rkcanfd_stats = &priv->stats;
const struct canfd_frame *cfd_nominal;
const struct sk_buff *skb;
unsigned int tx_tail;
@@ -166,6 +167,9 @@ static int rkcanfd_rxstx_filter(struct rkcanfd_priv *priv,
return 0;
/* Affected by Erratum 6 */
+ u64_stats_update_begin(&rkcanfd_stats->syncp);
+ u64_stats_inc(&rkcanfd_stats->tx_extended_as_standard_errors);
+ u64_stats_update_end(&rkcanfd_stats->syncp);
/* Manual handling of CAN Bus Error counters. See
* rkcanfd_get_corrected_berr_counter() for detailed
@@ -211,8 +215,15 @@ static int rkcanfd_handle_rx_int_one(struct rkcanfd_priv *priv)
cfd->data, sizeof(cfd->data));
/* Erratum 5: Counters for TXEFIFO and RXFIFO may be wrong */
- if (rkcanfd_fifo_header_empty(header))
+ if (rkcanfd_fifo_header_empty(header)) {
+ struct rkcanfd_stats *rkcanfd_stats = &priv->stats;
+
+ u64_stats_update_begin(&rkcanfd_stats->syncp);
+ u64_stats_inc(&rkcanfd_stats->rx_fifo_empty_errors);
+ u64_stats_update_end(&rkcanfd_stats->syncp);
+
return 0;
+ }
len = rkcanfd_fifo_header_to_cfd_header(priv, header, cfd);
diff --git a/drivers/net/can/rockchip/rockchip_canfd.h b/drivers/net/can/rockchip/rockchip_canfd.h
index 67f135fbcfb9..f24a1d18be66 100644
--- a/drivers/net/can/rockchip/rockchip_canfd.h
+++ b/drivers/net/can/rockchip/rockchip_canfd.h
@@ -446,6 +446,16 @@ struct rkcanfd_fifo_header {
u32 ts;
};
+struct rkcanfd_stats {
+ struct u64_stats_sync syncp;
+
+ /* Erratum 5 */
+ u64_stats_t rx_fifo_empty_errors;
+
+ /* Erratum 6 */
+ u64_stats_t tx_extended_as_standard_errors;
+};
+
struct rkcanfd_priv {
struct can_priv can;
struct can_rx_offload offload;
@@ -461,6 +471,8 @@ struct rkcanfd_priv {
struct can_berr_counter bec;
+ struct rkcanfd_stats stats;
+
struct reset_control *reset;
struct clk_bulk_data *clks;
int clks_num;
@@ -515,6 +527,8 @@ rkcanfd_get_tx_free(const struct rkcanfd_priv *priv)
return RKCANFD_TXFIFO_DEPTH - rkcanfd_get_tx_pending(priv);
}
+void rkcanfd_ethtool_init(struct rkcanfd_priv *priv);
+
int rkcanfd_handle_rx_int(struct rkcanfd_priv *priv);
void rkcanfd_timestamp_init(struct rkcanfd_priv *priv);
--
2.45.2
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