1/*
  2 * Copyright (C) 2017 Netronome Systems, Inc.
  3 *
  4 * This software is licensed under the GNU General License Version 2,
  5 * June 1991 as shown in the file COPYING in the top-level directory of this
  6 * source tree.
  7 *
  8 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
  9 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 10 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 11 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
 12 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
 13 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
 14 */
 15
 16#include <linux/debugfs.h>
 17#include <linux/etherdevice.h>
 18#include <linux/kernel.h>
 19#include <linux/module.h>
 20#include <linux/netdevice.h>
 21#include <linux/slab.h>
 22#include <net/netlink.h>
 23#include <net/pkt_cls.h>
 24#include <net/rtnetlink.h>
 25#include <net/udp_tunnel.h>
 26
 27#include "netdevsim.h"
 28
 29static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
 30{
 31	struct netdevsim *ns = netdev_priv(dev);
 32
 33	if (!nsim_ipsec_tx(ns, skb))
 34		goto out;
 35
 36	u64_stats_update_begin(&ns->syncp);
 37	ns->tx_packets++;
 38	ns->tx_bytes += skb->len;
 39	u64_stats_update_end(&ns->syncp);
 40
 41out:
 42	dev_kfree_skb(skb);
 43
 44	return NETDEV_TX_OK;
 45}
 46
 47static void nsim_set_rx_mode(struct net_device *dev)
 48{
 49}
 50
 51static int nsim_change_mtu(struct net_device *dev, int new_mtu)
 52{
 53	struct netdevsim *ns = netdev_priv(dev);
 54
 55	if (ns->xdp.prog && new_mtu > NSIM_XDP_MAX_MTU)
 56		return -EBUSY;
 57
 58	dev->mtu = new_mtu;
 59
 60	return 0;
 61}
 62
 63static void
 64nsim_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 65{
 66	struct netdevsim *ns = netdev_priv(dev);
 67	unsigned int start;
 68
 69	do {
 70		start = u64_stats_fetch_begin(&ns->syncp);
 71		stats->tx_bytes = ns->tx_bytes;
 72		stats->tx_packets = ns->tx_packets;
 73	} while (u64_stats_fetch_retry(&ns->syncp, start));
 74}
 75
 76static int
 77nsim_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)
 78{
 79	return nsim_bpf_setup_tc_block_cb(type, type_data, cb_priv);
 80}
 81
 82static int nsim_set_vf_mac(struct net_device *dev, int vf, u8 *mac)
 83{
 84	struct netdevsim *ns = netdev_priv(dev);
 85	struct nsim_dev *nsim_dev = ns->nsim_dev;
 86
 87	/* Only refuse multicast addresses, zero address can mean unset/any. */
 88	if (vf >= nsim_dev_get_vfs(nsim_dev) || is_multicast_ether_addr(mac))
 89		return -EINVAL;
 90	memcpy(nsim_dev->vfconfigs[vf].vf_mac, mac, ETH_ALEN);
 91
 92	return 0;
 93}
 94
 95static int nsim_set_vf_vlan(struct net_device *dev, int vf,
 96			    u16 vlan, u8 qos, __be16 vlan_proto)
 97{
 98	struct netdevsim *ns = netdev_priv(dev);
 99	struct nsim_dev *nsim_dev = ns->nsim_dev;
100
101	if (vf >= nsim_dev_get_vfs(nsim_dev) || vlan > 4095 || qos > 7)
102		return -EINVAL;
103
104	nsim_dev->vfconfigs[vf].vlan = vlan;
105	nsim_dev->vfconfigs[vf].qos = qos;
106	nsim_dev->vfconfigs[vf].vlan_proto = vlan_proto;
107
108	return 0;
109}
110
111static int nsim_set_vf_rate(struct net_device *dev, int vf, int min, int max)
112{
113	struct netdevsim *ns = netdev_priv(dev);
114	struct nsim_dev *nsim_dev = ns->nsim_dev;
115
116	if (nsim_esw_mode_is_switchdev(ns->nsim_dev)) {
117		pr_err("Not supported in switchdev mode. Please use devlink API.\n");
118		return -EOPNOTSUPP;
119	}
120
121	if (vf >= nsim_dev_get_vfs(nsim_dev))
122		return -EINVAL;
123
124	nsim_dev->vfconfigs[vf].min_tx_rate = min;
125	nsim_dev->vfconfigs[vf].max_tx_rate = max;
126
127	return 0;
128}
129
130static int nsim_set_vf_spoofchk(struct net_device *dev, int vf, bool val)
131{
132	struct netdevsim *ns = netdev_priv(dev);
133	struct nsim_dev *nsim_dev = ns->nsim_dev;
134
135	if (vf >= nsim_dev_get_vfs(nsim_dev))
136		return -EINVAL;
137	nsim_dev->vfconfigs[vf].spoofchk_enabled = val;
138
139	return 0;
140}
141
142static int nsim_set_vf_rss_query_en(struct net_device *dev, int vf, bool val)
143{
144	struct netdevsim *ns = netdev_priv(dev);
145	struct nsim_dev *nsim_dev = ns->nsim_dev;
146
147	if (vf >= nsim_dev_get_vfs(nsim_dev))
148		return -EINVAL;
149	nsim_dev->vfconfigs[vf].rss_query_enabled = val;
150
151	return 0;
152}
153
154static int nsim_set_vf_trust(struct net_device *dev, int vf, bool val)
155{
156	struct netdevsim *ns = netdev_priv(dev);
157	struct nsim_dev *nsim_dev = ns->nsim_dev;
158
159	if (vf >= nsim_dev_get_vfs(nsim_dev))
160		return -EINVAL;
161	nsim_dev->vfconfigs[vf].trusted = val;
162
163	return 0;
164}
165
166static int
167nsim_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi)
168{
169	struct netdevsim *ns = netdev_priv(dev);
170	struct nsim_dev *nsim_dev = ns->nsim_dev;
171
172	if (vf >= nsim_dev_get_vfs(nsim_dev))
173		return -EINVAL;
174
175	ivi->vf = vf;
176	ivi->linkstate = nsim_dev->vfconfigs[vf].link_state;
177	ivi->min_tx_rate = nsim_dev->vfconfigs[vf].min_tx_rate;
178	ivi->max_tx_rate = nsim_dev->vfconfigs[vf].max_tx_rate;
179	ivi->vlan = nsim_dev->vfconfigs[vf].vlan;
180	ivi->vlan_proto = nsim_dev->vfconfigs[vf].vlan_proto;
181	ivi->qos = nsim_dev->vfconfigs[vf].qos;
182	memcpy(&ivi->mac, nsim_dev->vfconfigs[vf].vf_mac, ETH_ALEN);
183	ivi->spoofchk = nsim_dev->vfconfigs[vf].spoofchk_enabled;
184	ivi->trusted = nsim_dev->vfconfigs[vf].trusted;
185	ivi->rss_query_en = nsim_dev->vfconfigs[vf].rss_query_enabled;
186
187	return 0;
188}
189
190static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state)
191{
192	struct netdevsim *ns = netdev_priv(dev);
193	struct nsim_dev *nsim_dev = ns->nsim_dev;
194
195	if (vf >= nsim_dev_get_vfs(nsim_dev))
196		return -EINVAL;
197
198	switch (state) {
199	case IFLA_VF_LINK_STATE_AUTO:
200	case IFLA_VF_LINK_STATE_ENABLE:
201	case IFLA_VF_LINK_STATE_DISABLE:
202		break;
203	default:
204		return -EINVAL;
205	}
206
207	nsim_dev->vfconfigs[vf].link_state = state;
208
209	return 0;
210}
211
212static LIST_HEAD(nsim_block_cb_list);
213
214static int
215nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data)
216{
217	struct netdevsim *ns = netdev_priv(dev);
218
219	switch (type) {
220	case TC_SETUP_BLOCK:
221		return flow_block_cb_setup_simple(type_data,
222						  &nsim_block_cb_list,
223						  nsim_setup_tc_block_cb,
224						  ns, ns, true);
225	default:
226		return -EOPNOTSUPP;
227	}
228}
229
230static int
231nsim_set_features(struct net_device *dev, netdev_features_t features)
232{
233	struct netdevsim *ns = netdev_priv(dev);
234
235	if ((dev->features & NETIF_F_HW_TC) > (features & NETIF_F_HW_TC))
236		return nsim_bpf_disable_tc(ns);
237
238	return 0;
239}
240
241static const struct net_device_ops nsim_netdev_ops = {
242	.ndo_start_xmit		= nsim_start_xmit,
243	.ndo_set_rx_mode	= nsim_set_rx_mode,
244	.ndo_set_mac_address	= eth_mac_addr,
245	.ndo_validate_addr	= eth_validate_addr,
246	.ndo_change_mtu		= nsim_change_mtu,
247	.ndo_get_stats64	= nsim_get_stats64,
248	.ndo_set_vf_mac		= nsim_set_vf_mac,
249	.ndo_set_vf_vlan	= nsim_set_vf_vlan,
250	.ndo_set_vf_rate	= nsim_set_vf_rate,
251	.ndo_set_vf_spoofchk	= nsim_set_vf_spoofchk,
252	.ndo_set_vf_trust	= nsim_set_vf_trust,
253	.ndo_get_vf_config	= nsim_get_vf_config,
254	.ndo_set_vf_link_state	= nsim_set_vf_link_state,
255	.ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en,
256	.ndo_setup_tc		= nsim_setup_tc,
257	.ndo_set_features	= nsim_set_features,
258	.ndo_bpf		= nsim_bpf,
259};
260
261static const struct net_device_ops nsim_vf_netdev_ops = {
262	.ndo_start_xmit		= nsim_start_xmit,
263	.ndo_set_rx_mode	= nsim_set_rx_mode,
264	.ndo_set_mac_address	= eth_mac_addr,
265	.ndo_validate_addr	= eth_validate_addr,
266	.ndo_change_mtu		= nsim_change_mtu,
267	.ndo_get_stats64	= nsim_get_stats64,
268	.ndo_setup_tc		= nsim_setup_tc,
269	.ndo_set_features	= nsim_set_features,
270};
271
272static void nsim_setup(struct net_device *dev)
273{
274	ether_setup(dev);
275	eth_hw_addr_random(dev);
276
277	dev->tx_queue_len = 0;
278	dev->flags |= IFF_NOARP;
279	dev->flags &= ~IFF_MULTICAST;
280	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE |
281			   IFF_NO_QUEUE;
282	dev->features |= NETIF_F_HIGHDMA |
283			 NETIF_F_SG |
284			 NETIF_F_FRAGLIST |
285			 NETIF_F_HW_CSUM |
286			 NETIF_F_TSO;
287	dev->hw_features |= NETIF_F_HW_TC;
288	dev->max_mtu = ETH_MAX_MTU;
289}
290
291static int nsim_init_netdevsim(struct netdevsim *ns)
292{
293	int err;
294
295	ns->netdev->netdev_ops = &nsim_netdev_ops;
296
297	err = nsim_udp_tunnels_info_create(ns->nsim_dev, ns->netdev);
298	if (err)
299		return err;
300
301	rtnl_lock();
302	err = nsim_bpf_init(ns);
303	if (err)
304		goto err_utn_destroy;
305
306	nsim_ipsec_init(ns);
307
308	err = register_netdevice(ns->netdev);
309	if (err)
310		goto err_ipsec_teardown;
311	rtnl_unlock();
312	return 0;
313
314err_ipsec_teardown:
315	nsim_ipsec_teardown(ns);
316	nsim_bpf_uninit(ns);
317err_utn_destroy:
318	rtnl_unlock();
319	nsim_udp_tunnels_info_destroy(ns->netdev);
320	return err;
321}
322
323static int nsim_init_netdevsim_vf(struct netdevsim *ns)
324{
325	int err;
326
327	ns->netdev->netdev_ops = &nsim_vf_netdev_ops;
328	rtnl_lock();
329	err = register_netdevice(ns->netdev);
330	rtnl_unlock();
331	return err;
332}
333
334struct netdevsim *
335nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
336{
337	struct net_device *dev;
338	struct netdevsim *ns;
339	int err;
340
341	dev = alloc_netdev_mq(sizeof(*ns), "eth%d", NET_NAME_UNKNOWN, nsim_setup,
342			      nsim_dev->nsim_bus_dev->num_queues);
343	if (!dev)
344		return ERR_PTR(-ENOMEM);
345
346	dev_net_set(dev, nsim_dev_net(nsim_dev));
347	ns = netdev_priv(dev);
348	ns->netdev = dev;
349	u64_stats_init(&ns->syncp);
350	ns->nsim_dev = nsim_dev;
351	ns->nsim_dev_port = nsim_dev_port;
352	ns->nsim_bus_dev = nsim_dev->nsim_bus_dev;
353	SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev);
354	SET_NETDEV_DEVLINK_PORT(dev, &nsim_dev_port->devlink_port);
355	nsim_ethtool_init(ns);
356	if (nsim_dev_port_is_pf(nsim_dev_port))
357		err = nsim_init_netdevsim(ns);
358	else
359		err = nsim_init_netdevsim_vf(ns);
360	if (err)
361		goto err_free_netdev;
362	return ns;
363
364err_free_netdev:
365	free_netdev(dev);
366	return ERR_PTR(err);
367}
368
369void nsim_destroy(struct netdevsim *ns)
370{
371	struct net_device *dev = ns->netdev;
372
373	rtnl_lock();
374	unregister_netdevice(dev);
375	if (nsim_dev_port_is_pf(ns->nsim_dev_port)) {
376		nsim_ipsec_teardown(ns);
377		nsim_bpf_uninit(ns);
378	}
379	rtnl_unlock();
380	if (nsim_dev_port_is_pf(ns->nsim_dev_port))
381		nsim_udp_tunnels_info_destroy(dev);
382	free_netdev(dev);
383}
384
385static int nsim_validate(struct nlattr *tb[], struct nlattr *data[],
386			 struct netlink_ext_ack *extack)
387{
388	NL_SET_ERR_MSG_MOD(extack,
389			   "Please use: echo \"[ID] [PORT_COUNT] [NUM_QUEUES]\" > /sys/bus/netdevsim/new_device");
390	return -EOPNOTSUPP;
391}
392
393static struct rtnl_link_ops nsim_link_ops __read_mostly = {
394	.kind		= DRV_NAME,
395	.validate	= nsim_validate,
396};
397
398static int __init nsim_module_init(void)
399{
400	int err;
401
402	err = nsim_dev_init();
403	if (err)
404		return err;
405
406	err = nsim_bus_init();
407	if (err)
408		goto err_dev_exit;
409
410	err = rtnl_link_register(&nsim_link_ops);
411	if (err)
412		goto err_bus_exit;
413
414	return 0;
415
416err_bus_exit:
417	nsim_bus_exit();
418err_dev_exit:
419	nsim_dev_exit();
420	return err;
421}
422
423static void __exit nsim_module_exit(void)
424{
425	rtnl_link_unregister(&nsim_link_ops);
426	nsim_bus_exit();
427	nsim_dev_exit();
428}
429
430module_init(nsim_module_init);
431module_exit(nsim_module_exit);
432MODULE_LICENSE("GPL");
433MODULE_ALIAS_RTNL_LINK(DRV_NAME);