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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_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
86
87 /* Only refuse multicast addresses, zero address can mean unset/any. */
88 if (vf >= nsim_bus_dev->num_vfs || is_multicast_ether_addr(mac))
89 return -EINVAL;
90 memcpy(nsim_bus_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_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
100
101 if (vf >= nsim_bus_dev->num_vfs || vlan > 4095 || qos > 7)
102 return -EINVAL;
103
104 nsim_bus_dev->vfconfigs[vf].vlan = vlan;
105 nsim_bus_dev->vfconfigs[vf].qos = qos;
106 nsim_bus_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_bus_dev *nsim_bus_dev = ns->nsim_bus_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_bus_dev->num_vfs)
122 return -EINVAL;
123
124 nsim_bus_dev->vfconfigs[vf].min_tx_rate = min;
125 nsim_bus_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_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
134
135 if (vf >= nsim_bus_dev->num_vfs)
136 return -EINVAL;
137 nsim_bus_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_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
146
147 if (vf >= nsim_bus_dev->num_vfs)
148 return -EINVAL;
149 nsim_bus_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_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
158
159 if (vf >= nsim_bus_dev->num_vfs)
160 return -EINVAL;
161 nsim_bus_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_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
171
172 if (vf >= nsim_bus_dev->num_vfs)
173 return -EINVAL;
174
175 ivi->vf = vf;
176 ivi->linkstate = nsim_bus_dev->vfconfigs[vf].link_state;
177 ivi->min_tx_rate = nsim_bus_dev->vfconfigs[vf].min_tx_rate;
178 ivi->max_tx_rate = nsim_bus_dev->vfconfigs[vf].max_tx_rate;
179 ivi->vlan = nsim_bus_dev->vfconfigs[vf].vlan;
180 ivi->vlan_proto = nsim_bus_dev->vfconfigs[vf].vlan_proto;
181 ivi->qos = nsim_bus_dev->vfconfigs[vf].qos;
182 memcpy(&ivi->mac, nsim_bus_dev->vfconfigs[vf].vf_mac, ETH_ALEN);
183 ivi->spoofchk = nsim_bus_dev->vfconfigs[vf].spoofchk_enabled;
184 ivi->trusted = nsim_bus_dev->vfconfigs[vf].trusted;
185 ivi->rss_query_en = nsim_bus_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_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
194
195 if (vf >= nsim_bus_dev->num_vfs)
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_bus_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 struct devlink_port *nsim_get_devlink_port(struct net_device *dev)
242{
243 struct netdevsim *ns = netdev_priv(dev);
244
245 return &ns->nsim_dev_port->devlink_port;
246}
247
248static const struct net_device_ops nsim_netdev_ops = {
249 .ndo_start_xmit = nsim_start_xmit,
250 .ndo_set_rx_mode = nsim_set_rx_mode,
251 .ndo_set_mac_address = eth_mac_addr,
252 .ndo_validate_addr = eth_validate_addr,
253 .ndo_change_mtu = nsim_change_mtu,
254 .ndo_get_stats64 = nsim_get_stats64,
255 .ndo_set_vf_mac = nsim_set_vf_mac,
256 .ndo_set_vf_vlan = nsim_set_vf_vlan,
257 .ndo_set_vf_rate = nsim_set_vf_rate,
258 .ndo_set_vf_spoofchk = nsim_set_vf_spoofchk,
259 .ndo_set_vf_trust = nsim_set_vf_trust,
260 .ndo_get_vf_config = nsim_get_vf_config,
261 .ndo_set_vf_link_state = nsim_set_vf_link_state,
262 .ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en,
263 .ndo_setup_tc = nsim_setup_tc,
264 .ndo_set_features = nsim_set_features,
265 .ndo_bpf = nsim_bpf,
266 .ndo_get_devlink_port = nsim_get_devlink_port,
267};
268
269static const struct net_device_ops nsim_vf_netdev_ops = {
270 .ndo_start_xmit = nsim_start_xmit,
271 .ndo_set_rx_mode = nsim_set_rx_mode,
272 .ndo_set_mac_address = eth_mac_addr,
273 .ndo_validate_addr = eth_validate_addr,
274 .ndo_change_mtu = nsim_change_mtu,
275 .ndo_get_stats64 = nsim_get_stats64,
276 .ndo_setup_tc = nsim_setup_tc,
277 .ndo_set_features = nsim_set_features,
278 .ndo_get_devlink_port = nsim_get_devlink_port,
279};
280
281static void nsim_setup(struct net_device *dev)
282{
283 ether_setup(dev);
284 eth_hw_addr_random(dev);
285
286 dev->tx_queue_len = 0;
287 dev->flags |= IFF_NOARP;
288 dev->flags &= ~IFF_MULTICAST;
289 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE |
290 IFF_NO_QUEUE;
291 dev->features |= NETIF_F_HIGHDMA |
292 NETIF_F_SG |
293 NETIF_F_FRAGLIST |
294 NETIF_F_HW_CSUM |
295 NETIF_F_TSO;
296 dev->hw_features |= NETIF_F_HW_TC;
297 dev->max_mtu = ETH_MAX_MTU;
298}
299
300static int nsim_init_netdevsim(struct netdevsim *ns)
301{
302 int err;
303
304 ns->netdev->netdev_ops = &nsim_netdev_ops;
305
306 err = nsim_udp_tunnels_info_create(ns->nsim_dev, ns->netdev);
307 if (err)
308 return err;
309
310 rtnl_lock();
311 err = nsim_bpf_init(ns);
312 if (err)
313 goto err_utn_destroy;
314
315 nsim_ipsec_init(ns);
316
317 err = register_netdevice(ns->netdev);
318 if (err)
319 goto err_ipsec_teardown;
320 rtnl_unlock();
321 return 0;
322
323err_ipsec_teardown:
324 nsim_ipsec_teardown(ns);
325 nsim_bpf_uninit(ns);
326err_utn_destroy:
327 rtnl_unlock();
328 nsim_udp_tunnels_info_destroy(ns->netdev);
329 return err;
330}
331
332static int nsim_init_netdevsim_vf(struct netdevsim *ns)
333{
334 int err;
335
336 ns->netdev->netdev_ops = &nsim_vf_netdev_ops;
337 rtnl_lock();
338 err = register_netdevice(ns->netdev);
339 rtnl_unlock();
340 return err;
341}
342
343struct netdevsim *
344nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
345{
346 struct net_device *dev;
347 struct netdevsim *ns;
348 int err;
349
350 dev = alloc_netdev(sizeof(*ns), "eth%d", NET_NAME_UNKNOWN, nsim_setup);
351 if (!dev)
352 return ERR_PTR(-ENOMEM);
353
354 dev_net_set(dev, nsim_dev_net(nsim_dev));
355 ns = netdev_priv(dev);
356 ns->netdev = dev;
357 u64_stats_init(&ns->syncp);
358 ns->nsim_dev = nsim_dev;
359 ns->nsim_dev_port = nsim_dev_port;
360 ns->nsim_bus_dev = nsim_dev->nsim_bus_dev;
361 SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev);
362 nsim_ethtool_init(ns);
363 if (nsim_dev_port_is_pf(nsim_dev_port))
364 err = nsim_init_netdevsim(ns);
365 else
366 err = nsim_init_netdevsim_vf(ns);
367 if (err)
368 goto err_free_netdev;
369 return ns;
370
371err_free_netdev:
372 free_netdev(dev);
373 return ERR_PTR(err);
374}
375
376void nsim_destroy(struct netdevsim *ns)
377{
378 struct net_device *dev = ns->netdev;
379
380 rtnl_lock();
381 unregister_netdevice(dev);
382 if (nsim_dev_port_is_pf(ns->nsim_dev_port)) {
383 nsim_ipsec_teardown(ns);
384 nsim_bpf_uninit(ns);
385 }
386 rtnl_unlock();
387 if (nsim_dev_port_is_pf(ns->nsim_dev_port))
388 nsim_udp_tunnels_info_destroy(dev);
389 free_netdev(dev);
390}
391
392static int nsim_validate(struct nlattr *tb[], struct nlattr *data[],
393 struct netlink_ext_ack *extack)
394{
395 NL_SET_ERR_MSG_MOD(extack, "Please use: echo \"[ID] [PORT_COUNT]\" > /sys/bus/netdevsim/new_device");
396 return -EOPNOTSUPP;
397}
398
399static struct rtnl_link_ops nsim_link_ops __read_mostly = {
400 .kind = DRV_NAME,
401 .validate = nsim_validate,
402};
403
404static int __init nsim_module_init(void)
405{
406 int err;
407
408 err = nsim_dev_init();
409 if (err)
410 return err;
411
412 err = nsim_bus_init();
413 if (err)
414 goto err_dev_exit;
415
416 err = rtnl_link_register(&nsim_link_ops);
417 if (err)
418 goto err_bus_exit;
419
420 return 0;
421
422err_bus_exit:
423 nsim_bus_exit();
424err_dev_exit:
425 nsim_dev_exit();
426 return err;
427}
428
429static void __exit nsim_module_exit(void)
430{
431 rtnl_link_unregister(&nsim_link_ops);
432 nsim_bus_exit();
433 nsim_dev_exit();
434}
435
436module_init(nsim_module_init);
437module_exit(nsim_module_exit);
438MODULE_LICENSE("GPL");
439MODULE_ALIAS_RTNL_LINK(DRV_NAME);