1// SPDX-License-Identifier: GPL-2.0
  2// Copyright (c) 2020 Facebook
  3
  4#include <linux/debugfs.h>
  5#include <linux/ethtool.h>
  6#include <linux/random.h>
  7
  8#include "netdevsim.h"
  9
 10static void
 11nsim_get_pause_stats(struct net_device *dev,
 12		     struct ethtool_pause_stats *pause_stats)
 13{
 14	struct netdevsim *ns = netdev_priv(dev);
 15
 16	if (ns->ethtool.pauseparam.report_stats_rx)
 17		pause_stats->rx_pause_frames = 1;
 18	if (ns->ethtool.pauseparam.report_stats_tx)
 19		pause_stats->tx_pause_frames = 2;
 20}
 21
 22static void
 23nsim_get_pauseparam(struct net_device *dev, struct ethtool_pauseparam *pause)
 24{
 25	struct netdevsim *ns = netdev_priv(dev);
 26
 27	pause->autoneg = 0; /* We don't support ksettings, so can't pretend */
 28	pause->rx_pause = ns->ethtool.pauseparam.rx;
 29	pause->tx_pause = ns->ethtool.pauseparam.tx;
 30}
 31
 32static int
 33nsim_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam *pause)
 34{
 35	struct netdevsim *ns = netdev_priv(dev);
 36
 37	if (pause->autoneg)
 38		return -EINVAL;
 39
 40	ns->ethtool.pauseparam.rx = pause->rx_pause;
 41	ns->ethtool.pauseparam.tx = pause->tx_pause;
 42	return 0;
 43}
 44
 45static int nsim_get_coalesce(struct net_device *dev,
 46			     struct ethtool_coalesce *coal,
 47			     struct kernel_ethtool_coalesce *kernel_coal,
 48			     struct netlink_ext_ack *extack)
 49{
 50	struct netdevsim *ns = netdev_priv(dev);
 51
 52	memcpy(coal, &ns->ethtool.coalesce, sizeof(ns->ethtool.coalesce));
 53	return 0;
 54}
 55
 56static int nsim_set_coalesce(struct net_device *dev,
 57			     struct ethtool_coalesce *coal,
 58			     struct kernel_ethtool_coalesce *kernel_coal,
 59			     struct netlink_ext_ack *extack)
 60{
 61	struct netdevsim *ns = netdev_priv(dev);
 62
 63	memcpy(&ns->ethtool.coalesce, coal, sizeof(ns->ethtool.coalesce));
 64	return 0;
 65}
 66
 67static void nsim_get_ringparam(struct net_device *dev,
 68			       struct ethtool_ringparam *ring,
 69			       struct kernel_ethtool_ringparam *kernel_ring,
 70			       struct netlink_ext_ack *extack)
 71{
 72	struct netdevsim *ns = netdev_priv(dev);
 73
 74	memcpy(ring, &ns->ethtool.ring, sizeof(ns->ethtool.ring));
 75}
 76
 77static int nsim_set_ringparam(struct net_device *dev,
 78			      struct ethtool_ringparam *ring,
 79			      struct kernel_ethtool_ringparam *kernel_ring,
 80			      struct netlink_ext_ack *extack)
 81{
 82	struct netdevsim *ns = netdev_priv(dev);
 83
 84	ns->ethtool.ring.rx_pending = ring->rx_pending;
 85	ns->ethtool.ring.rx_jumbo_pending = ring->rx_jumbo_pending;
 86	ns->ethtool.ring.rx_mini_pending = ring->rx_mini_pending;
 87	ns->ethtool.ring.tx_pending = ring->tx_pending;
 88	return 0;
 89}
 90
 91static void
 92nsim_get_channels(struct net_device *dev, struct ethtool_channels *ch)
 93{
 94	struct netdevsim *ns = netdev_priv(dev);
 95
 96	ch->max_combined = ns->nsim_bus_dev->num_queues;
 97	ch->combined_count = ns->ethtool.channels;
 98}
 99
100static int
101nsim_set_channels(struct net_device *dev, struct ethtool_channels *ch)
102{
103	struct netdevsim *ns = netdev_priv(dev);
104	int err;
105
106	err = netif_set_real_num_queues(dev, ch->combined_count,
107					ch->combined_count);
108	if (err)
109		return err;
110
111	ns->ethtool.channels = ch->combined_count;
112	return 0;
113}
114
115static int
116nsim_get_fecparam(struct net_device *dev, struct ethtool_fecparam *fecparam)
117{
118	struct netdevsim *ns = netdev_priv(dev);
119
120	if (ns->ethtool.get_err)
121		return -ns->ethtool.get_err;
122	memcpy(fecparam, &ns->ethtool.fec, sizeof(ns->ethtool.fec));
123	return 0;
124}
125
126static int
127nsim_set_fecparam(struct net_device *dev, struct ethtool_fecparam *fecparam)
128{
129	struct netdevsim *ns = netdev_priv(dev);
130	u32 fec;
131
132	if (ns->ethtool.set_err)
133		return -ns->ethtool.set_err;
134	memcpy(&ns->ethtool.fec, fecparam, sizeof(ns->ethtool.fec));
135	fec = fecparam->fec;
136	if (fec == ETHTOOL_FEC_AUTO)
137		fec |= ETHTOOL_FEC_OFF;
138	fec |= ETHTOOL_FEC_NONE;
139	ns->ethtool.fec.active_fec = 1 << (fls(fec) - 1);
140	return 0;
141}
142
143static const struct ethtool_ops nsim_ethtool_ops = {
144	.supported_coalesce_params	= ETHTOOL_COALESCE_ALL_PARAMS,
145	.get_pause_stats	        = nsim_get_pause_stats,
146	.get_pauseparam		        = nsim_get_pauseparam,
147	.set_pauseparam		        = nsim_set_pauseparam,
148	.set_coalesce			= nsim_set_coalesce,
149	.get_coalesce			= nsim_get_coalesce,
150	.get_ringparam			= nsim_get_ringparam,
151	.set_ringparam			= nsim_set_ringparam,
152	.get_channels			= nsim_get_channels,
153	.set_channels			= nsim_set_channels,
154	.get_fecparam			= nsim_get_fecparam,
155	.set_fecparam			= nsim_set_fecparam,
156};
157
158static void nsim_ethtool_ring_init(struct netdevsim *ns)
159{
160	ns->ethtool.ring.rx_max_pending = 4096;
161	ns->ethtool.ring.rx_jumbo_max_pending = 4096;
162	ns->ethtool.ring.rx_mini_max_pending = 4096;
163	ns->ethtool.ring.tx_max_pending = 4096;
164}
165
166void nsim_ethtool_init(struct netdevsim *ns)
167{
168	struct dentry *ethtool, *dir;
169
170	ns->netdev->ethtool_ops = &nsim_ethtool_ops;
171
172	nsim_ethtool_ring_init(ns);
173
174	ns->ethtool.fec.fec = ETHTOOL_FEC_NONE;
175	ns->ethtool.fec.active_fec = ETHTOOL_FEC_NONE;
176
177	ns->ethtool.channels = ns->nsim_bus_dev->num_queues;
178
179	ethtool = debugfs_create_dir("ethtool", ns->nsim_dev_port->ddir);
180
181	debugfs_create_u32("get_err", 0600, ethtool, &ns->ethtool.get_err);
182	debugfs_create_u32("set_err", 0600, ethtool, &ns->ethtool.set_err);
183
184	dir = debugfs_create_dir("pause", ethtool);
185	debugfs_create_bool("report_stats_rx", 0600, dir,
186			    &ns->ethtool.pauseparam.report_stats_rx);
187	debugfs_create_bool("report_stats_tx", 0600, dir,
188			    &ns->ethtool.pauseparam.report_stats_tx);
189
190	dir = debugfs_create_dir("ring", ethtool);
191	debugfs_create_u32("rx_max_pending", 0600, dir,
192			   &ns->ethtool.ring.rx_max_pending);
193	debugfs_create_u32("rx_jumbo_max_pending", 0600, dir,
194			   &ns->ethtool.ring.rx_jumbo_max_pending);
195	debugfs_create_u32("rx_mini_max_pending", 0600, dir,
196			   &ns->ethtool.ring.rx_mini_max_pending);
197	debugfs_create_u32("tx_max_pending", 0600, dir,
198			   &ns->ethtool.ring.tx_max_pending);
199}