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can: flexcan: add ethtool support to get rx/tx ring parameters 

This patch adds ethtool support to get the number of message buffers
configured for reception/transmission, which may also depends on
runtime configurations such as the 'rx-rtr' flag state.

Link: https://lore.kernel.org/all/20220108181633.420433-1-dario.binacchi@amarulasolutions.com
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
[mkl: port to net-next/master, replace __sw_hweight64 by simpler calculation]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Dario Binacchi 2022-01-08 19:16:33 +01:00 committed by Marc Kleine-Budde
parent 1c45f5778a
commit 74fc5a452e
1 changed files with 21 additions and 0 deletions
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21
drivers/net/can/flexcan/flexcan-ethtool.c
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@ -17,6 +17,26 @@ static const char flexcan_priv_flags_strings[][ETH_GSTRING_LEN] = {
"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)
{
@ -81,6 +101,7 @@ static int flexcan_get_sset_count(struct net_device *netdev, int sset)
}
static 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,