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[linux.git] / drivers / net / netdevsim / netdev.c
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
26 #include "netdevsim.h"
27
28 static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
29 {
30         struct netdevsim *ns = netdev_priv(dev);
31
32         if (!nsim_ipsec_tx(ns, skb))
33                 goto out;
34
35         u64_stats_update_begin(&ns->syncp);
36         ns->tx_packets++;
37         ns->tx_bytes += skb->len;
38         u64_stats_update_end(&ns->syncp);
39
40 out:
41         dev_kfree_skb(skb);
42
43         return NETDEV_TX_OK;
44 }
45
46 static void nsim_set_rx_mode(struct net_device *dev)
47 {
48 }
49
50 static int nsim_change_mtu(struct net_device *dev, int new_mtu)
51 {
52         struct netdevsim *ns = netdev_priv(dev);
53
54         if (ns->xdp.prog && new_mtu > NSIM_XDP_MAX_MTU)
55                 return -EBUSY;
56
57         dev->mtu = new_mtu;
58
59         return 0;
60 }
61
62 static void
63 nsim_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
64 {
65         struct netdevsim *ns = netdev_priv(dev);
66         unsigned int start;
67
68         do {
69                 start = u64_stats_fetch_begin(&ns->syncp);
70                 stats->tx_bytes = ns->tx_bytes;
71                 stats->tx_packets = ns->tx_packets;
72         } while (u64_stats_fetch_retry(&ns->syncp, start));
73 }
74
75 static int
76 nsim_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)
77 {
78         return nsim_bpf_setup_tc_block_cb(type, type_data, cb_priv);
79 }
80
81 static int
82 nsim_setup_tc_block(struct net_device *dev, struct tc_block_offload *f)
83 {
84         struct netdevsim *ns = netdev_priv(dev);
85
86         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
87                 return -EOPNOTSUPP;
88
89         switch (f->command) {
90         case TC_BLOCK_BIND:
91                 return tcf_block_cb_register(f->block, nsim_setup_tc_block_cb,
92                                              ns, ns, f->extack);
93         case TC_BLOCK_UNBIND:
94                 tcf_block_cb_unregister(f->block, nsim_setup_tc_block_cb, ns);
95                 return 0;
96         default:
97                 return -EOPNOTSUPP;
98         }
99 }
100
101 static int nsim_set_vf_mac(struct net_device *dev, int vf, u8 *mac)
102 {
103         struct netdevsim *ns = netdev_priv(dev);
104         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
105
106         /* Only refuse multicast addresses, zero address can mean unset/any. */
107         if (vf >= nsim_bus_dev->num_vfs || is_multicast_ether_addr(mac))
108                 return -EINVAL;
109         memcpy(nsim_bus_dev->vfconfigs[vf].vf_mac, mac, ETH_ALEN);
110
111         return 0;
112 }
113
114 static int nsim_set_vf_vlan(struct net_device *dev, int vf,
115                             u16 vlan, u8 qos, __be16 vlan_proto)
116 {
117         struct netdevsim *ns = netdev_priv(dev);
118         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
119
120         if (vf >= nsim_bus_dev->num_vfs || vlan > 4095 || qos > 7)
121                 return -EINVAL;
122
123         nsim_bus_dev->vfconfigs[vf].vlan = vlan;
124         nsim_bus_dev->vfconfigs[vf].qos = qos;
125         nsim_bus_dev->vfconfigs[vf].vlan_proto = vlan_proto;
126
127         return 0;
128 }
129
130 static int nsim_set_vf_rate(struct net_device *dev, int vf, int min, int max)
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
138         nsim_bus_dev->vfconfigs[vf].min_tx_rate = min;
139         nsim_bus_dev->vfconfigs[vf].max_tx_rate = max;
140
141         return 0;
142 }
143
144 static int nsim_set_vf_spoofchk(struct net_device *dev, int vf, bool val)
145 {
146         struct netdevsim *ns = netdev_priv(dev);
147         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
148
149         if (vf >= nsim_bus_dev->num_vfs)
150                 return -EINVAL;
151         nsim_bus_dev->vfconfigs[vf].spoofchk_enabled = val;
152
153         return 0;
154 }
155
156 static int nsim_set_vf_rss_query_en(struct net_device *dev, int vf, bool val)
157 {
158         struct netdevsim *ns = netdev_priv(dev);
159         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
160
161         if (vf >= nsim_bus_dev->num_vfs)
162                 return -EINVAL;
163         nsim_bus_dev->vfconfigs[vf].rss_query_enabled = val;
164
165         return 0;
166 }
167
168 static int nsim_set_vf_trust(struct net_device *dev, int vf, bool val)
169 {
170         struct netdevsim *ns = netdev_priv(dev);
171         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
172
173         if (vf >= nsim_bus_dev->num_vfs)
174                 return -EINVAL;
175         nsim_bus_dev->vfconfigs[vf].trusted = val;
176
177         return 0;
178 }
179
180 static int
181 nsim_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi)
182 {
183         struct netdevsim *ns = netdev_priv(dev);
184         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
185
186         if (vf >= nsim_bus_dev->num_vfs)
187                 return -EINVAL;
188
189         ivi->vf = vf;
190         ivi->linkstate = nsim_bus_dev->vfconfigs[vf].link_state;
191         ivi->min_tx_rate = nsim_bus_dev->vfconfigs[vf].min_tx_rate;
192         ivi->max_tx_rate = nsim_bus_dev->vfconfigs[vf].max_tx_rate;
193         ivi->vlan = nsim_bus_dev->vfconfigs[vf].vlan;
194         ivi->vlan_proto = nsim_bus_dev->vfconfigs[vf].vlan_proto;
195         ivi->qos = nsim_bus_dev->vfconfigs[vf].qos;
196         memcpy(&ivi->mac, nsim_bus_dev->vfconfigs[vf].vf_mac, ETH_ALEN);
197         ivi->spoofchk = nsim_bus_dev->vfconfigs[vf].spoofchk_enabled;
198         ivi->trusted = nsim_bus_dev->vfconfigs[vf].trusted;
199         ivi->rss_query_en = nsim_bus_dev->vfconfigs[vf].rss_query_enabled;
200
201         return 0;
202 }
203
204 static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state)
205 {
206         struct netdevsim *ns = netdev_priv(dev);
207         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
208
209         if (vf >= nsim_bus_dev->num_vfs)
210                 return -EINVAL;
211
212         switch (state) {
213         case IFLA_VF_LINK_STATE_AUTO:
214         case IFLA_VF_LINK_STATE_ENABLE:
215         case IFLA_VF_LINK_STATE_DISABLE:
216                 break;
217         default:
218                 return -EINVAL;
219         }
220
221         nsim_bus_dev->vfconfigs[vf].link_state = state;
222
223         return 0;
224 }
225
226 static int
227 nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data)
228 {
229         switch (type) {
230         case TC_SETUP_BLOCK:
231                 return nsim_setup_tc_block(dev, type_data);
232         default:
233                 return -EOPNOTSUPP;
234         }
235 }
236
237 static int
238 nsim_set_features(struct net_device *dev, netdev_features_t features)
239 {
240         struct netdevsim *ns = netdev_priv(dev);
241
242         if ((dev->features & NETIF_F_HW_TC) > (features & NETIF_F_HW_TC))
243                 return nsim_bpf_disable_tc(ns);
244
245         return 0;
246 }
247
248 static struct devlink_port *nsim_get_devlink_port(struct net_device *dev)
249 {
250         struct netdevsim *ns = netdev_priv(dev);
251
252         return &ns->nsim_dev_port->devlink_port;
253 }
254
255 static const struct net_device_ops nsim_netdev_ops = {
256         .ndo_start_xmit         = nsim_start_xmit,
257         .ndo_set_rx_mode        = nsim_set_rx_mode,
258         .ndo_set_mac_address    = eth_mac_addr,
259         .ndo_validate_addr      = eth_validate_addr,
260         .ndo_change_mtu         = nsim_change_mtu,
261         .ndo_get_stats64        = nsim_get_stats64,
262         .ndo_set_vf_mac         = nsim_set_vf_mac,
263         .ndo_set_vf_vlan        = nsim_set_vf_vlan,
264         .ndo_set_vf_rate        = nsim_set_vf_rate,
265         .ndo_set_vf_spoofchk    = nsim_set_vf_spoofchk,
266         .ndo_set_vf_trust       = nsim_set_vf_trust,
267         .ndo_get_vf_config      = nsim_get_vf_config,
268         .ndo_set_vf_link_state  = nsim_set_vf_link_state,
269         .ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en,
270         .ndo_setup_tc           = nsim_setup_tc,
271         .ndo_set_features       = nsim_set_features,
272         .ndo_bpf                = nsim_bpf,
273         .ndo_get_devlink_port   = nsim_get_devlink_port,
274 };
275
276 static void nsim_setup(struct net_device *dev)
277 {
278         ether_setup(dev);
279         eth_hw_addr_random(dev);
280
281         dev->tx_queue_len = 0;
282         dev->flags |= IFF_NOARP;
283         dev->flags &= ~IFF_MULTICAST;
284         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE |
285                            IFF_NO_QUEUE;
286         dev->features |= NETIF_F_HIGHDMA |
287                          NETIF_F_SG |
288                          NETIF_F_FRAGLIST |
289                          NETIF_F_HW_CSUM |
290                          NETIF_F_TSO;
291         dev->hw_features |= NETIF_F_HW_TC;
292         dev->max_mtu = ETH_MAX_MTU;
293 }
294
295 struct netdevsim *
296 nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
297 {
298         struct net_device *dev;
299         struct netdevsim *ns;
300         int err;
301
302         dev = alloc_netdev(sizeof(*ns), "eth%d", NET_NAME_UNKNOWN, nsim_setup);
303         if (!dev)
304                 return ERR_PTR(-ENOMEM);
305
306         ns = netdev_priv(dev);
307         ns->netdev = dev;
308         ns->nsim_dev = nsim_dev;
309         ns->nsim_dev_port = nsim_dev_port;
310         ns->nsim_bus_dev = nsim_dev->nsim_bus_dev;
311         SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev);
312         dev->netdev_ops = &nsim_netdev_ops;
313
314         rtnl_lock();
315         err = nsim_bpf_init(ns);
316         if (err)
317                 goto err_free_netdev;
318
319         nsim_ipsec_init(ns);
320
321         err = register_netdevice(dev);
322         if (err)
323                 goto err_ipsec_teardown;
324         rtnl_unlock();
325
326         return ns;
327
328 err_ipsec_teardown:
329         nsim_ipsec_teardown(ns);
330         nsim_bpf_uninit(ns);
331         rtnl_unlock();
332 err_free_netdev:
333         free_netdev(dev);
334         return ERR_PTR(err);
335 }
336
337 void nsim_destroy(struct netdevsim *ns)
338 {
339         struct net_device *dev = ns->netdev;
340
341         rtnl_lock();
342         unregister_netdevice(dev);
343         nsim_ipsec_teardown(ns);
344         nsim_bpf_uninit(ns);
345         rtnl_unlock();
346         free_netdev(dev);
347 }
348
349 static int nsim_validate(struct nlattr *tb[], struct nlattr *data[],
350                          struct netlink_ext_ack *extack)
351 {
352         NL_SET_ERR_MSG_MOD(extack, "Please use: echo \"[ID] [PORT_COUNT]\" > /sys/bus/netdevsim/new_device");
353         return -EOPNOTSUPP;
354 }
355
356 static struct rtnl_link_ops nsim_link_ops __read_mostly = {
357         .kind           = DRV_NAME,
358         .validate       = nsim_validate,
359 };
360
361 static int __init nsim_module_init(void)
362 {
363         int err;
364
365         err = nsim_dev_init();
366         if (err)
367                 return err;
368
369         err = nsim_bus_init();
370         if (err)
371                 goto err_dev_exit;
372
373         err = rtnl_link_register(&nsim_link_ops);
374         if (err)
375                 goto err_bus_exit;
376
377         return 0;
378
379 err_bus_exit:
380         nsim_bus_exit();
381 err_dev_exit:
382         nsim_dev_exit();
383         return err;
384 }
385
386 static void __exit nsim_module_exit(void)
387 {
388         rtnl_link_unregister(&nsim_link_ops);
389         nsim_bus_exit();
390         nsim_dev_exit();
391 }
392
393 module_init(nsim_module_init);
394 module_exit(nsim_module_exit);
395 MODULE_LICENSE("GPL");
396 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
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