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(syncp: &ns->syncp);
37 ns->tx_packets++;
38 ns->tx_bytes += skb->len;
39 u64_stats_update_end(syncp: &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(syncp: &ns->syncp);
71 stats->tx_bytes = ns->tx_bytes;
72 stats->tx_packets = ns->tx_packets;
73 } while (u64_stats_fetch_retry(syncp: &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(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(nsim_dev: 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 void nsim_taprio_stats(struct tc_taprio_qopt_stats *stats)
213{
214 stats->window_drops = 0;
215 stats->tx_overruns = 0;
216}
217
218static int nsim_setup_tc_taprio(struct net_device *dev,
219 struct tc_taprio_qopt_offload *offload)
220{
221 int err = 0;
222
223 switch (offload->cmd) {
224 case TAPRIO_CMD_REPLACE:
225 case TAPRIO_CMD_DESTROY:
226 break;
227 case TAPRIO_CMD_STATS:
228 nsim_taprio_stats(stats: &offload->stats);
229 break;
230 default:
231 err = -EOPNOTSUPP;
232 }
233
234 return err;
235}
236
237static LIST_HEAD(nsim_block_cb_list);
238
239static int
240nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data)
241{
242 struct netdevsim *ns = netdev_priv(dev);
243
244 switch (type) {
245 case TC_SETUP_QDISC_TAPRIO:
246 return nsim_setup_tc_taprio(dev, offload: type_data);
247 case TC_SETUP_BLOCK:
248 return flow_block_cb_setup_simple(f: type_data,
249 driver_list: &nsim_block_cb_list,
250 cb: nsim_setup_tc_block_cb,
251 cb_ident: ns, cb_priv: ns, ingress_only: true);
252 default:
253 return -EOPNOTSUPP;
254 }
255}
256
257static int
258nsim_set_features(struct net_device *dev, netdev_features_t features)
259{
260 struct netdevsim *ns = netdev_priv(dev);
261
262 if ((dev->features & NETIF_F_HW_TC) > (features & NETIF_F_HW_TC))
263 return nsim_bpf_disable_tc(ns);
264
265 return 0;
266}
267
268static const struct net_device_ops nsim_netdev_ops = {
269 .ndo_start_xmit = nsim_start_xmit,
270 .ndo_set_rx_mode = nsim_set_rx_mode,
271 .ndo_set_mac_address = eth_mac_addr,
272 .ndo_validate_addr = eth_validate_addr,
273 .ndo_change_mtu = nsim_change_mtu,
274 .ndo_get_stats64 = nsim_get_stats64,
275 .ndo_set_vf_mac = nsim_set_vf_mac,
276 .ndo_set_vf_vlan = nsim_set_vf_vlan,
277 .ndo_set_vf_rate = nsim_set_vf_rate,
278 .ndo_set_vf_spoofchk = nsim_set_vf_spoofchk,
279 .ndo_set_vf_trust = nsim_set_vf_trust,
280 .ndo_get_vf_config = nsim_get_vf_config,
281 .ndo_set_vf_link_state = nsim_set_vf_link_state,
282 .ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en,
283 .ndo_setup_tc = nsim_setup_tc,
284 .ndo_set_features = nsim_set_features,
285 .ndo_bpf = nsim_bpf,
286};
287
288static const struct net_device_ops nsim_vf_netdev_ops = {
289 .ndo_start_xmit = nsim_start_xmit,
290 .ndo_set_rx_mode = nsim_set_rx_mode,
291 .ndo_set_mac_address = eth_mac_addr,
292 .ndo_validate_addr = eth_validate_addr,
293 .ndo_change_mtu = nsim_change_mtu,
294 .ndo_get_stats64 = nsim_get_stats64,
295 .ndo_setup_tc = nsim_setup_tc,
296 .ndo_set_features = nsim_set_features,
297};
298
299static void nsim_setup(struct net_device *dev)
300{
301 ether_setup(dev);
302 eth_hw_addr_random(dev);
303
304 dev->tx_queue_len = 0;
305 dev->flags |= IFF_NOARP;
306 dev->flags &= ~IFF_MULTICAST;
307 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE |
308 IFF_NO_QUEUE;
309 dev->features |= NETIF_F_HIGHDMA |
310 NETIF_F_SG |
311 NETIF_F_FRAGLIST |
312 NETIF_F_HW_CSUM |
313 NETIF_F_TSO;
314 dev->hw_features |= NETIF_F_HW_TC;
315 dev->max_mtu = ETH_MAX_MTU;
316 dev->xdp_features = NETDEV_XDP_ACT_HW_OFFLOAD;
317}
318
319static int nsim_init_netdevsim(struct netdevsim *ns)
320{
321 struct mock_phc *phc;
322 int err;
323
324 phc = mock_phc_create(dev: &ns->nsim_bus_dev->dev);
325 if (IS_ERR(ptr: phc))
326 return PTR_ERR(ptr: phc);
327
328 ns->phc = phc;
329 ns->netdev->netdev_ops = &nsim_netdev_ops;
330
331 err = nsim_udp_tunnels_info_create(nsim_dev: ns->nsim_dev, dev: ns->netdev);
332 if (err)
333 goto err_phc_destroy;
334
335 rtnl_lock();
336 err = nsim_bpf_init(ns);
337 if (err)
338 goto err_utn_destroy;
339
340 nsim_macsec_init(ns);
341 nsim_ipsec_init(ns);
342
343 err = register_netdevice(dev: ns->netdev);
344 if (err)
345 goto err_ipsec_teardown;
346 rtnl_unlock();
347 return 0;
348
349err_ipsec_teardown:
350 nsim_ipsec_teardown(ns);
351 nsim_macsec_teardown(ns);
352 nsim_bpf_uninit(ns);
353err_utn_destroy:
354 rtnl_unlock();
355 nsim_udp_tunnels_info_destroy(dev: ns->netdev);
356err_phc_destroy:
357 mock_phc_destroy(phc: ns->phc);
358 return err;
359}
360
361static int nsim_init_netdevsim_vf(struct netdevsim *ns)
362{
363 int err;
364
365 ns->netdev->netdev_ops = &nsim_vf_netdev_ops;
366 rtnl_lock();
367 err = register_netdevice(dev: ns->netdev);
368 rtnl_unlock();
369 return err;
370}
371
372struct netdevsim *
373nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
374{
375 struct net_device *dev;
376 struct netdevsim *ns;
377 int err;
378
379 dev = alloc_netdev_mq(sizeof(*ns), "eth%d", NET_NAME_UNKNOWN, nsim_setup,
380 nsim_dev->nsim_bus_dev->num_queues);
381 if (!dev)
382 return ERR_PTR(error: -ENOMEM);
383
384 dev_net_set(dev, net: nsim_dev_net(nsim_dev));
385 ns = netdev_priv(dev);
386 ns->netdev = dev;
387 u64_stats_init(syncp: &ns->syncp);
388 ns->nsim_dev = nsim_dev;
389 ns->nsim_dev_port = nsim_dev_port;
390 ns->nsim_bus_dev = nsim_dev->nsim_bus_dev;
391 SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev);
392 SET_NETDEV_DEVLINK_PORT(dev, &nsim_dev_port->devlink_port);
393 nsim_ethtool_init(ns);
394 if (nsim_dev_port_is_pf(nsim_dev_port))
395 err = nsim_init_netdevsim(ns);
396 else
397 err = nsim_init_netdevsim_vf(ns);
398 if (err)
399 goto err_free_netdev;
400 return ns;
401
402err_free_netdev:
403 free_netdev(dev);
404 return ERR_PTR(error: err);
405}
406
407void nsim_destroy(struct netdevsim *ns)
408{
409 struct net_device *dev = ns->netdev;
410
411 rtnl_lock();
412 unregister_netdevice(dev);
413 if (nsim_dev_port_is_pf(nsim_dev_port: ns->nsim_dev_port)) {
414 nsim_macsec_teardown(ns);
415 nsim_ipsec_teardown(ns);
416 nsim_bpf_uninit(ns);
417 }
418 rtnl_unlock();
419 if (nsim_dev_port_is_pf(nsim_dev_port: ns->nsim_dev_port))
420 nsim_udp_tunnels_info_destroy(dev);
421 mock_phc_destroy(phc: ns->phc);
422 free_netdev(dev);
423}
424
425static int nsim_validate(struct nlattr *tb[], struct nlattr *data[],
426 struct netlink_ext_ack *extack)
427{
428 NL_SET_ERR_MSG_MOD(extack,
429 "Please use: echo \"[ID] [PORT_COUNT] [NUM_QUEUES]\" > /sys/bus/netdevsim/new_device");
430 return -EOPNOTSUPP;
431}
432
433static struct rtnl_link_ops nsim_link_ops __read_mostly = {
434 .kind = DRV_NAME,
435 .validate = nsim_validate,
436};
437
438static int __init nsim_module_init(void)
439{
440 int err;
441
442 err = nsim_dev_init();
443 if (err)
444 return err;
445
446 err = nsim_bus_init();
447 if (err)
448 goto err_dev_exit;
449
450 err = rtnl_link_register(ops: &nsim_link_ops);
451 if (err)
452 goto err_bus_exit;
453
454 return 0;
455
456err_bus_exit:
457 nsim_bus_exit();
458err_dev_exit:
459 nsim_dev_exit();
460 return err;
461}
462
463static void __exit nsim_module_exit(void)
464{
465 rtnl_link_unregister(ops: &nsim_link_ops);
466 nsim_bus_exit();
467 nsim_dev_exit();
468}
469
470module_init(nsim_module_init);
471module_exit(nsim_module_exit);
472MODULE_LICENSE("GPL");
473MODULE_DESCRIPTION("Simulated networking device for testing");
474MODULE_ALIAS_RTNL_LINK(DRV_NAME);
475

source code of linux/drivers/net/netdevsim/netdev.c