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// SPDX-License-Identifier: GPL-2.0
//
// mcp251xfd - Microchip MCP251xFD Family CAN controller driver
//
// Copyright (c) 2021, 2022 Pengutronix,
// Marc Kleine-Budde <kernel@pengutronix.de>
//
#include <linux/ethtool.h>
#include "mcp251xfd.h"
#include "mcp251xfd-ram.h"
static void
mcp251xfd_ring_get_ringparam(struct net_device *ndev,
struct ethtool_ringparam *ring,
struct kernel_ethtool_ringparam *kernel_ring,
struct netlink_ext_ack *extack)
{
const struct mcp251xfd_priv *priv = netdev_priv(ndev);
const bool fd_mode = mcp251xfd_is_fd_mode(priv);
struct can_ram_layout layout;
can_ram_get_layout(&layout, &mcp251xfd_ram_config, NULL, NULL, fd_mode);
ring->rx_max_pending = layout.max_rx;
ring->tx_max_pending = layout.max_tx;
ring->rx_pending = priv->rx_obj_num;
ring->tx_pending = priv->tx->obj_num;
}
static int
mcp251xfd_ring_set_ringparam(struct net_device *ndev,
struct ethtool_ringparam *ring,
struct kernel_ethtool_ringparam *kernel_ring,
struct netlink_ext_ack *extack)
{
struct mcp251xfd_priv *priv = netdev_priv(ndev);
const bool fd_mode = mcp251xfd_is_fd_mode(priv);
struct can_ram_layout layout;
can_ram_get_layout(&layout, &mcp251xfd_ram_config, ring, NULL, fd_mode);
if ((layout.cur_rx != priv->rx_obj_num ||
layout.cur_tx != priv->tx->obj_num) &&
netif_running(ndev))
return -EBUSY;
priv->rx_obj_num = layout.cur_rx;
priv->rx_obj_num_coalesce_irq = layout.rx_coalesce;
priv->tx->obj_num = layout.cur_tx;
return 0;
}
static int mcp251xfd_ring_get_coalesce(struct net_device *ndev,
struct ethtool_coalesce *ec,
struct kernel_ethtool_coalesce *kec,
struct netlink_ext_ack *ext_ack)
{
struct mcp251xfd_priv *priv = netdev_priv(ndev);
u32 rx_max_frames;
/* The ethtool doc says:
* To disable coalescing, set usecs = 0 and max_frames = 1.
*/
if (priv->rx_obj_num_coalesce_irq == 0)
rx_max_frames = 1;
else
rx_max_frames = priv->rx_obj_num_coalesce_irq;
ec->rx_max_coalesced_frames_irq = rx_max_frames;
ec->rx_coalesce_usecs_irq = priv->rx_coalesce_usecs_irq;
return 0;
}
static int mcp251xfd_ring_set_coalesce(struct net_device *ndev,
struct ethtool_coalesce *ec,
struct kernel_ethtool_coalesce *kec,
struct netlink_ext_ack *ext_ack)
{
struct mcp251xfd_priv *priv = netdev_priv(ndev);
const bool fd_mode = mcp251xfd_is_fd_mode(priv);
const struct ethtool_ringparam ring = {
.rx_pending = priv->rx_obj_num,
.tx_pending = priv->tx->obj_num,
};
struct can_ram_layout layout;
can_ram_get_layout(&layout, &mcp251xfd_ram_config, &ring, ec, fd_mode);
if ((layout.rx_coalesce != priv->rx_obj_num_coalesce_irq ||
ec->rx_coalesce_usecs_irq != priv->rx_coalesce_usecs_irq) &&
netif_running(ndev))
return -EBUSY;
priv->rx_obj_num = layout.cur_rx;
priv->rx_obj_num_coalesce_irq = layout.rx_coalesce;
priv->rx_coalesce_usecs_irq = ec->rx_coalesce_usecs_irq;
priv->tx->obj_num = layout.cur_tx;
return 0;
}
static const struct ethtool_ops mcp251xfd_ethtool_ops = {
.supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS_IRQ |
ETHTOOL_COALESCE_RX_MAX_FRAMES_IRQ,
.get_ringparam = mcp251xfd_ring_get_ringparam,
.set_ringparam = mcp251xfd_ring_set_ringparam,
.get_coalesce = mcp251xfd_ring_get_coalesce,
.set_coalesce = mcp251xfd_ring_set_coalesce,
};
void mcp251xfd_ethtool_init(struct mcp251xfd_priv *priv)
{
struct can_ram_layout layout;
priv->ndev->ethtool_ops = &mcp251xfd_ethtool_ops;
can_ram_get_layout(&layout, &mcp251xfd_ram_config, NULL, NULL, false);
priv->rx_obj_num = layout.default_rx;
priv->tx->obj_num = layout.default_tx;
priv->rx_obj_num_coalesce_irq = 0;
priv->rx_coalesce_usecs_irq = 0;
}
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