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// SPDX-License-Identifier: GPL-2.0+
/* Copyright (c) 2022 Amarula Solutions, Dario Binacchi <dario.binacchi@amarulasolutions.com>
* Copyright (c) 2022 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de>
*
*/
#include <linux/can/dev.h>
#include <linux/ethtool.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/platform_device.h>
#include "flexcan.h"
static const char flexcan_priv_flags_strings[][ETH_GSTRING_LEN] = {
#define FLEXCAN_PRIV_FLAGS_RX_RTR BIT(0)
"rx-rtr",
};
static void
flexcan_get_ringparam(struct net_device *ndev, struct ethtool_ringparam *ring,
struct kernel_ethtool_ringparam *kernel_ring,
struct netlink_ext_ack *ext_ack)
{
const struct flexcan_priv *priv = netdev_priv(ndev);
ring->rx_max_pending = priv->mb_count;
ring->tx_max_pending = priv->mb_count;
if (priv->devtype_data.quirks & FLEXCAN_QUIRK_USE_RX_MAILBOX)
ring->rx_pending = priv->offload.mb_last -
priv->offload.mb_first + 1;
else
ring->rx_pending = 6; /* RX-FIFO depth is fixed */
/* the drive currently supports only on TX buffer */
ring->tx_pending = 1;
}
static void
flexcan_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
{
switch (stringset) {
case ETH_SS_PRIV_FLAGS:
memcpy(data, flexcan_priv_flags_strings,
sizeof(flexcan_priv_flags_strings));
}
}
static u32 flexcan_get_priv_flags(struct net_device *ndev)
{
const struct flexcan_priv *priv = netdev_priv(ndev);
u32 priv_flags = 0;
if (flexcan_active_rx_rtr(priv))
priv_flags |= FLEXCAN_PRIV_FLAGS_RX_RTR;
return priv_flags;
}
static int flexcan_set_priv_flags(struct net_device *ndev, u32 priv_flags)
{
struct flexcan_priv *priv = netdev_priv(ndev);
u32 quirks = priv->devtype_data.quirks;
if (priv_flags & FLEXCAN_PRIV_FLAGS_RX_RTR) {
if (flexcan_supports_rx_mailbox_rtr(priv))
quirks |= FLEXCAN_QUIRK_USE_RX_MAILBOX;
else if (flexcan_supports_rx_fifo(priv))
quirks &= ~FLEXCAN_QUIRK_USE_RX_MAILBOX;
else
quirks |= FLEXCAN_QUIRK_USE_RX_MAILBOX;
} else {
if (flexcan_supports_rx_mailbox(priv))
quirks |= FLEXCAN_QUIRK_USE_RX_MAILBOX;
else
quirks &= ~FLEXCAN_QUIRK_USE_RX_MAILBOX;
}
if (quirks != priv->devtype_data.quirks && netif_running(ndev))
return -EBUSY;
priv->devtype_data.quirks = quirks;
if (!(priv_flags & FLEXCAN_PRIV_FLAGS_RX_RTR) &&
!flexcan_active_rx_rtr(priv))
netdev_info(ndev,
"Activating RX mailbox mode, cannot receive RTR frames.\n");
return 0;
}
static int flexcan_get_sset_count(struct net_device *netdev, int sset)
{
switch (sset) {
case ETH_SS_PRIV_FLAGS:
return ARRAY_SIZE(flexcan_priv_flags_strings);
default:
return -EOPNOTSUPP;
}
}
const struct ethtool_ops flexcan_ethtool_ops = {
.get_ringparam = flexcan_get_ringparam,
.get_strings = flexcan_get_strings,
.get_priv_flags = flexcan_get_priv_flags,
.set_priv_flags = flexcan_set_priv_flags,
.get_sset_count = flexcan_get_sset_count,
.get_ts_info = ethtool_op_get_ts_info,
};
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