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1// SPDX-License-Identifier: GPL-2.02//3// mcp251xfd - Microchip MCP251xFD Family CAN controller driver4//5// Copyright (c) 2021, 2022 Pengutronix,6// Marc Kleine-Budde <kernel@pengutronix.de>7//8 9#include <linux/ethtool.h>10 11#include "mcp251xfd.h"12#include "mcp251xfd-ram.h"13 14static void15mcp251xfd_ring_get_ringparam(struct net_device *ndev,16 struct ethtool_ringparam *ring,17 struct kernel_ethtool_ringparam *kernel_ring,18 struct netlink_ext_ack *extack)19{20 const struct mcp251xfd_priv *priv = netdev_priv(ndev);21 const bool fd_mode = mcp251xfd_is_fd_mode(priv);22 struct can_ram_layout layout;23 24 can_ram_get_layout(&layout, &mcp251xfd_ram_config, NULL, NULL, fd_mode);25 ring->rx_max_pending = layout.max_rx;26 ring->tx_max_pending = layout.max_tx;27 28 ring->rx_pending = priv->rx_obj_num;29 ring->tx_pending = priv->tx->obj_num;30}31 32static int33mcp251xfd_ring_set_ringparam(struct net_device *ndev,34 struct ethtool_ringparam *ring,35 struct kernel_ethtool_ringparam *kernel_ring,36 struct netlink_ext_ack *extack)37{38 struct mcp251xfd_priv *priv = netdev_priv(ndev);39 const bool fd_mode = mcp251xfd_is_fd_mode(priv);40 struct can_ram_layout layout;41 42 can_ram_get_layout(&layout, &mcp251xfd_ram_config, ring, NULL, fd_mode);43 if ((layout.cur_rx != priv->rx_obj_num ||44 layout.cur_tx != priv->tx->obj_num) &&45 netif_running(ndev))46 return -EBUSY;47 48 priv->rx_obj_num = layout.cur_rx;49 priv->rx_obj_num_coalesce_irq = layout.rx_coalesce;50 priv->tx->obj_num = layout.cur_tx;51 priv->tx_obj_num_coalesce_irq = layout.tx_coalesce;52 53 return 0;54}55 56static int mcp251xfd_ring_get_coalesce(struct net_device *ndev,57 struct ethtool_coalesce *ec,58 struct kernel_ethtool_coalesce *kec,59 struct netlink_ext_ack *ext_ack)60{61 struct mcp251xfd_priv *priv = netdev_priv(ndev);62 u32 rx_max_frames, tx_max_frames;63 64 /* The ethtool doc says:65 * To disable coalescing, set usecs = 0 and max_frames = 1.66 */67 if (priv->rx_obj_num_coalesce_irq == 0)68 rx_max_frames = 1;69 else70 rx_max_frames = priv->rx_obj_num_coalesce_irq;71 72 ec->rx_max_coalesced_frames_irq = rx_max_frames;73 ec->rx_coalesce_usecs_irq = priv->rx_coalesce_usecs_irq;74 75 if (priv->tx_obj_num_coalesce_irq == 0)76 tx_max_frames = 1;77 else78 tx_max_frames = priv->tx_obj_num_coalesce_irq;79 80 ec->tx_max_coalesced_frames_irq = tx_max_frames;81 ec->tx_coalesce_usecs_irq = priv->tx_coalesce_usecs_irq;82 83 return 0;84}85 86static int mcp251xfd_ring_set_coalesce(struct net_device *ndev,87 struct ethtool_coalesce *ec,88 struct kernel_ethtool_coalesce *kec,89 struct netlink_ext_ack *ext_ack)90{91 struct mcp251xfd_priv *priv = netdev_priv(ndev);92 const bool fd_mode = mcp251xfd_is_fd_mode(priv);93 const struct ethtool_ringparam ring = {94 .rx_pending = priv->rx_obj_num,95 .tx_pending = priv->tx->obj_num,96 };97 struct can_ram_layout layout;98 99 can_ram_get_layout(&layout, &mcp251xfd_ram_config, &ring, ec, fd_mode);100 101 if ((layout.rx_coalesce != priv->rx_obj_num_coalesce_irq ||102 ec->rx_coalesce_usecs_irq != priv->rx_coalesce_usecs_irq ||103 layout.tx_coalesce != priv->tx_obj_num_coalesce_irq ||104 ec->tx_coalesce_usecs_irq != priv->tx_coalesce_usecs_irq) &&105 netif_running(ndev))106 return -EBUSY;107 108 priv->rx_obj_num = layout.cur_rx;109 priv->rx_obj_num_coalesce_irq = layout.rx_coalesce;110 priv->rx_coalesce_usecs_irq = ec->rx_coalesce_usecs_irq;111 112 priv->tx->obj_num = layout.cur_tx;113 priv->tx_obj_num_coalesce_irq = layout.tx_coalesce;114 priv->tx_coalesce_usecs_irq = ec->tx_coalesce_usecs_irq;115 116 return 0;117}118 119static const struct ethtool_ops mcp251xfd_ethtool_ops = {120 .supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS_IRQ |121 ETHTOOL_COALESCE_RX_MAX_FRAMES_IRQ |122 ETHTOOL_COALESCE_TX_USECS_IRQ |123 ETHTOOL_COALESCE_TX_MAX_FRAMES_IRQ,124 .get_ringparam = mcp251xfd_ring_get_ringparam,125 .set_ringparam = mcp251xfd_ring_set_ringparam,126 .get_coalesce = mcp251xfd_ring_get_coalesce,127 .set_coalesce = mcp251xfd_ring_set_coalesce,128 .get_ts_info = can_ethtool_op_get_ts_info_hwts,129};130 131void mcp251xfd_ethtool_init(struct mcp251xfd_priv *priv)132{133 struct can_ram_layout layout;134 135 priv->ndev->ethtool_ops = &mcp251xfd_ethtool_ops;136 137 can_ram_get_layout(&layout, &mcp251xfd_ram_config, NULL, NULL, false);138 priv->rx_obj_num = layout.default_rx;139 priv->tx->obj_num = layout.default_tx;140 141 priv->rx_obj_num_coalesce_irq = 0;142 priv->tx_obj_num_coalesce_irq = 0;143 priv->rx_coalesce_usecs_irq = 0;144 priv->tx_coalesce_usecs_irq = 0;145}146