On 01.09.2023 14:10:45, Srinivas Goud wrote:
> Add ethtool stats interface for reading FIFO 1bit/2bit
> ECC errors information.
>
> Signed-off-by: Srinivas Goud <srinivas.goud@xxxxxxx>
> ---
> Changes in v4:
> None
>
> Changes in v3:
> None
>
> Changes in v2:
> Add ethtool stats interface
>
> drivers/net/can/xilinx_can.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
> index 798b32b..50e0c9d 100644
> --- a/drivers/net/can/xilinx_can.c
> +++ b/drivers/net/can/xilinx_can.c
> @@ -219,6 +219,7 @@ struct xcan_devtype_data {
> * @transceiver: Optional pointer to associated CAN transceiver
> * @rstc: Pointer to reset control
> * @ecc_enable: ECC enable flag
> + * @stats_lock: Lock for synchronizing hardware stats
To be precise: The lock is about the access of the 64 bit variables not
about the hardware access:
"Lock for accessing the "ecc_*bit_*fifo_cnt" stats"
> * @ecc_2bit_rxfifo_cnt: RXFIFO 2bit ECC count
> * @ecc_1bit_rxfifo_cnt: RXFIFO 1bit ECC count
> * @ecc_2bit_txolfifo_cnt: TXOLFIFO 2bit ECC count
> @@ -245,6 +246,7 @@ struct xcan_priv {
> struct phy *transceiver;
> struct reset_control *rstc;
> bool ecc_enable;
> + spinlock_t stats_lock; /* Lock for synchronizing hardware stats */
> u64 ecc_2bit_rxfifo_cnt;
> u64 ecc_1bit_rxfifo_cnt;
> u64 ecc_2bit_txolfifo_cnt;
> @@ -1164,6 +1166,9 @@ static void xcan_err_interrupt(struct net_device *ndev, u32 isr)
>
> if (priv->ecc_enable) {
> u32 reg_ecc;
> + unsigned long flags;
nitpick: move the flags before the reg_ecc.
> +
> + spin_lock_irqsave(&priv->stats_lock, flags);
>
> reg_ecc = priv->read_reg(priv, XCAN_RXFIFO_ECC_OFFSET);
> if (isr & XCAN_IXR_E2BERX_MASK) {
> @@ -1212,6 +1217,8 @@ static void xcan_err_interrupt(struct net_device *ndev, u32 isr)
> */
> priv->write_reg(priv, XCAN_ECC_CFG_OFFSET, XCAN_ECC_CFG_REECRX_MASK |
> XCAN_ECC_CFG_REECTXOL_MASK | XCAN_ECC_CFG_REECTXTL_MASK);
> +
> + spin_unlock_irqrestore(&priv->stats_lock, flags);
> }
>
> if (cf.can_id) {
> @@ -1639,6 +1646,23 @@ static int xcan_get_auto_tdcv(const struct net_device *ndev, u32 *tdcv)
> return 0;
> }
>
> +static void ethtool_get_ethtool_stats(struct net_device *ndev,
> + struct ethtool_stats *stats, u64 *data)
> +{
> + struct xcan_priv *priv = netdev_priv(ndev);
> + unsigned long flags;
> + int i = 0;
> +
> + spin_lock_irqsave(&priv->stats_lock, flags);
> + data[i++] = priv->ecc_2bit_rxfifo_cnt;
> + data[i++] = priv->ecc_1bit_rxfifo_cnt;
> + data[i++] = priv->ecc_2bit_txolfifo_cnt;
> + data[i++] = priv->ecc_1bit_txolfifo_cnt;
> + data[i++] = priv->ecc_2bit_txtlfifo_cnt;
> + data[i++] = priv->ecc_1bit_txtlfifo_cnt;
> + spin_unlock_irqrestore(&priv->stats_lock, flags);
> +}
> +
> static const struct net_device_ops xcan_netdev_ops = {
> .ndo_open = xcan_open,
> .ndo_stop = xcan_close,
> @@ -1648,6 +1672,7 @@ static const struct net_device_ops xcan_netdev_ops = {
>
> static const struct ethtool_ops xcan_ethtool_ops = {
> .get_ts_info = ethtool_op_get_ts_info,
> + .get_ethtool_stats = ethtool_get_ethtool_stats,
You also should implement .get_strings and .get_sset_count. Have you
tested your patch with "ethtool -S can0"?
> };
>
> /**
> --
> 2.1.1
>
>
regards,
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
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Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-9 |
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