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can: m_can: Add rx coalescing ethtool support

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Add the possibility to set coalescing parameters with ethtool.

rx-frames-irq and rx-usecs-irq can only be set and unset together as the
implemented mechanism would not work otherwise. rx-frames-irq can't be
greater than the RX FIFO size.

Also all values can only be changed if the chip is not active.

Polling is excluded from irq coalescing support.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/all/20240207093220.2681425-7-msp@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Markus Schneider-Pargmann 2024-02-07 10:32:12 +01:00 committed by Marc Kleine-Budde
parent ec390d0876
commit 9515223bd0
1 changed files with 54 additions and 1 deletions
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55
drivers/net/can/m_can/m_can.c
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@ -1977,7 +1977,57 @@ static const struct net_device_ops m_can_netdev_ops = {
.ndo_change_mtu = can_change_mtu,
};
static int m_can_get_coalesce(struct net_device *dev,
struct ethtool_coalesce *ec,
struct kernel_ethtool_coalesce *kec,
struct netlink_ext_ack *ext_ack)
{
struct m_can_classdev *cdev = netdev_priv(dev);
ec->rx_max_coalesced_frames_irq = cdev->rx_max_coalesced_frames_irq;
ec->rx_coalesce_usecs_irq = cdev->rx_coalesce_usecs_irq;
return 0;
}
static int m_can_set_coalesce(struct net_device *dev,
struct ethtool_coalesce *ec,
struct kernel_ethtool_coalesce *kec,
struct netlink_ext_ack *ext_ack)
{
struct m_can_classdev *cdev = netdev_priv(dev);
if (cdev->can.state != CAN_STATE_STOPPED) {
netdev_err(dev, "Device is in use, please shut it down first\n");
return -EBUSY;
}
if (ec->rx_max_coalesced_frames_irq > cdev->mcfg[MRAM_RXF0].num) {
netdev_err(dev, "rx-frames-irq %u greater than the RX FIFO %u\n",
ec->rx_max_coalesced_frames_irq,
cdev->mcfg[MRAM_RXF0].num);
return -EINVAL;
}
if ((ec->rx_max_coalesced_frames_irq == 0) != (ec->rx_coalesce_usecs_irq == 0)) {
netdev_err(dev, "rx-frames-irq and rx-usecs-irq can only be set together\n");
return -EINVAL;
}
cdev->rx_max_coalesced_frames_irq = ec->rx_max_coalesced_frames_irq;
cdev->rx_coalesce_usecs_irq = ec->rx_coalesce_usecs_irq;
return 0;
}
static const struct ethtool_ops m_can_ethtool_ops = {
.supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS_IRQ |
ETHTOOL_COALESCE_RX_MAX_FRAMES_IRQ,
.get_ts_info = ethtool_op_get_ts_info,
.get_coalesce = m_can_get_coalesce,
.set_coalesce = m_can_set_coalesce,
};
static const struct ethtool_ops m_can_ethtool_ops_polling = {
.get_ts_info = ethtool_op_get_ts_info,
};
@ -1985,7 +2035,10 @@ static int register_m_can_dev(struct net_device *dev)
{
dev->flags |= IFF_ECHO; /* we support local echo */
dev->netdev_ops = &m_can_netdev_ops;
dev->ethtool_ops = &m_can_ethtool_ops;
if (dev->irq)
dev->ethtool_ops = &m_can_ethtool_ops;
else
dev->ethtool_ops = &m_can_ethtool_ops_polling;
return register_candev(dev);
}