1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
3
4 #include <linux/etherdevice.h>
5 #include <linux/io-64-nonatomic-hi-lo.h>
6 #include <linux/lockdep.h>
7 #include <net/dst_metadata.h>
8
9 #include "nfpcore/nfp_cpp.h"
10 #include "nfpcore/nfp_nsp.h"
11 #include "nfp_app.h"
12 #include "nfp_main.h"
13 #include "nfp_net.h"
14 #include "nfp_net_ctrl.h"
15 #include "nfp_net_repr.h"
16 #include "nfp_net_sriov.h"
17 #include "nfp_port.h"
18
19 struct net_device *
nfp_repr_get_locked(struct nfp_app * app,struct nfp_reprs * set,unsigned int id)20 nfp_repr_get_locked(struct nfp_app *app, struct nfp_reprs *set, unsigned int id)
21 {
22 return rcu_dereference_protected(set->reprs[id],
23 nfp_app_is_locked(app));
24 }
25
26 static void
nfp_repr_inc_tx_stats(struct net_device * netdev,unsigned int len,int tx_status)27 nfp_repr_inc_tx_stats(struct net_device *netdev, unsigned int len,
28 int tx_status)
29 {
30 struct nfp_repr *repr = netdev_priv(netdev);
31 struct nfp_repr_pcpu_stats *stats;
32
33 if (unlikely(tx_status != NET_XMIT_SUCCESS &&
34 tx_status != NET_XMIT_CN)) {
35 this_cpu_inc(repr->stats->tx_drops);
36 return;
37 }
38
39 stats = this_cpu_ptr(repr->stats);
40 u64_stats_update_begin(&stats->syncp);
41 stats->tx_packets++;
42 stats->tx_bytes += len;
43 u64_stats_update_end(&stats->syncp);
44 }
45
nfp_repr_inc_rx_stats(struct net_device * netdev,unsigned int len)46 void nfp_repr_inc_rx_stats(struct net_device *netdev, unsigned int len)
47 {
48 struct nfp_repr *repr = netdev_priv(netdev);
49 struct nfp_repr_pcpu_stats *stats;
50
51 stats = this_cpu_ptr(repr->stats);
52 u64_stats_update_begin(&stats->syncp);
53 stats->rx_packets++;
54 stats->rx_bytes += len;
55 u64_stats_update_end(&stats->syncp);
56 }
57
58 static void
nfp_repr_phy_port_get_stats64(struct nfp_port * port,struct rtnl_link_stats64 * stats)59 nfp_repr_phy_port_get_stats64(struct nfp_port *port,
60 struct rtnl_link_stats64 *stats)
61 {
62 u8 __iomem *mem = port->eth_stats;
63
64 stats->tx_packets = readq(mem + NFP_MAC_STATS_TX_FRAMES_TRANSMITTED_OK);
65 stats->tx_bytes = readq(mem + NFP_MAC_STATS_TX_OUT_OCTETS);
66 stats->tx_dropped = readq(mem + NFP_MAC_STATS_TX_OUT_ERRORS);
67
68 stats->rx_packets = readq(mem + NFP_MAC_STATS_RX_FRAMES_RECEIVED_OK);
69 stats->rx_bytes = readq(mem + NFP_MAC_STATS_RX_IN_OCTETS);
70 stats->rx_dropped = readq(mem + NFP_MAC_STATS_RX_IN_ERRORS);
71 }
72
73 static void
nfp_repr_vnic_get_stats64(struct nfp_port * port,struct rtnl_link_stats64 * stats)74 nfp_repr_vnic_get_stats64(struct nfp_port *port,
75 struct rtnl_link_stats64 *stats)
76 {
77 /* TX and RX stats are flipped as we are returning the stats as seen
78 * at the switch port corresponding to the VF.
79 */
80 stats->tx_packets = readq(port->vnic + NFP_NET_CFG_STATS_RX_FRAMES);
81 stats->tx_bytes = readq(port->vnic + NFP_NET_CFG_STATS_RX_OCTETS);
82 stats->tx_dropped = readq(port->vnic + NFP_NET_CFG_STATS_RX_DISCARDS);
83
84 stats->rx_packets = readq(port->vnic + NFP_NET_CFG_STATS_TX_FRAMES);
85 stats->rx_bytes = readq(port->vnic + NFP_NET_CFG_STATS_TX_OCTETS);
86 stats->rx_dropped = readq(port->vnic + NFP_NET_CFG_STATS_TX_DISCARDS);
87 }
88
89 static void
nfp_repr_get_stats64(struct net_device * netdev,struct rtnl_link_stats64 * stats)90 nfp_repr_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats)
91 {
92 struct nfp_repr *repr = netdev_priv(netdev);
93
94 if (WARN_ON(!repr->port))
95 return;
96
97 switch (repr->port->type) {
98 case NFP_PORT_PHYS_PORT:
99 if (!__nfp_port_get_eth_port(repr->port))
100 break;
101 nfp_repr_phy_port_get_stats64(repr->port, stats);
102 break;
103 case NFP_PORT_PF_PORT:
104 case NFP_PORT_VF_PORT:
105 nfp_repr_vnic_get_stats64(repr->port, stats);
106 break;
107 default:
108 break;
109 }
110 }
111
112 static bool
nfp_repr_has_offload_stats(const struct net_device * dev,int attr_id)113 nfp_repr_has_offload_stats(const struct net_device *dev, int attr_id)
114 {
115 switch (attr_id) {
116 case IFLA_OFFLOAD_XSTATS_CPU_HIT:
117 return true;
118 }
119
120 return false;
121 }
122
123 static int
nfp_repr_get_host_stats64(const struct net_device * netdev,struct rtnl_link_stats64 * stats)124 nfp_repr_get_host_stats64(const struct net_device *netdev,
125 struct rtnl_link_stats64 *stats)
126 {
127 struct nfp_repr *repr = netdev_priv(netdev);
128 int i;
129
130 for_each_possible_cpu(i) {
131 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
132 struct nfp_repr_pcpu_stats *repr_stats;
133 unsigned int start;
134
135 repr_stats = per_cpu_ptr(repr->stats, i);
136 do {
137 start = u64_stats_fetch_begin_irq(&repr_stats->syncp);
138 tbytes = repr_stats->tx_bytes;
139 tpkts = repr_stats->tx_packets;
140 tdrops = repr_stats->tx_drops;
141 rbytes = repr_stats->rx_bytes;
142 rpkts = repr_stats->rx_packets;
143 } while (u64_stats_fetch_retry_irq(&repr_stats->syncp, start));
144
145 stats->tx_bytes += tbytes;
146 stats->tx_packets += tpkts;
147 stats->tx_dropped += tdrops;
148 stats->rx_bytes += rbytes;
149 stats->rx_packets += rpkts;
150 }
151
152 return 0;
153 }
154
155 static int
nfp_repr_get_offload_stats(int attr_id,const struct net_device * dev,void * stats)156 nfp_repr_get_offload_stats(int attr_id, const struct net_device *dev,
157 void *stats)
158 {
159 switch (attr_id) {
160 case IFLA_OFFLOAD_XSTATS_CPU_HIT:
161 return nfp_repr_get_host_stats64(dev, stats);
162 }
163
164 return -EINVAL;
165 }
166
nfp_repr_change_mtu(struct net_device * netdev,int new_mtu)167 static int nfp_repr_change_mtu(struct net_device *netdev, int new_mtu)
168 {
169 struct nfp_repr *repr = netdev_priv(netdev);
170 int err;
171
172 err = nfp_app_check_mtu(repr->app, netdev, new_mtu);
173 if (err)
174 return err;
175
176 err = nfp_app_repr_change_mtu(repr->app, netdev, new_mtu);
177 if (err)
178 return err;
179
180 netdev->mtu = new_mtu;
181
182 return 0;
183 }
184
nfp_repr_xmit(struct sk_buff * skb,struct net_device * netdev)185 static netdev_tx_t nfp_repr_xmit(struct sk_buff *skb, struct net_device *netdev)
186 {
187 struct nfp_repr *repr = netdev_priv(netdev);
188 unsigned int len = skb->len;
189 int ret;
190
191 skb_dst_drop(skb);
192 dst_hold((struct dst_entry *)repr->dst);
193 skb_dst_set(skb, (struct dst_entry *)repr->dst);
194 skb->dev = repr->dst->u.port_info.lower_dev;
195
196 ret = dev_queue_xmit(skb);
197 nfp_repr_inc_tx_stats(netdev, len, ret);
198
199 return NETDEV_TX_OK;
200 }
201
nfp_repr_stop(struct net_device * netdev)202 static int nfp_repr_stop(struct net_device *netdev)
203 {
204 struct nfp_repr *repr = netdev_priv(netdev);
205 int err;
206
207 err = nfp_app_repr_stop(repr->app, repr);
208 if (err)
209 return err;
210
211 nfp_port_configure(netdev, false);
212 return 0;
213 }
214
nfp_repr_open(struct net_device * netdev)215 static int nfp_repr_open(struct net_device *netdev)
216 {
217 struct nfp_repr *repr = netdev_priv(netdev);
218 int err;
219
220 err = nfp_port_configure(netdev, true);
221 if (err)
222 return err;
223
224 err = nfp_app_repr_open(repr->app, repr);
225 if (err)
226 goto err_port_disable;
227
228 return 0;
229
230 err_port_disable:
231 nfp_port_configure(netdev, false);
232 return err;
233 }
234
235 static netdev_features_t
nfp_repr_fix_features(struct net_device * netdev,netdev_features_t features)236 nfp_repr_fix_features(struct net_device *netdev, netdev_features_t features)
237 {
238 struct nfp_repr *repr = netdev_priv(netdev);
239 netdev_features_t old_features = features;
240 netdev_features_t lower_features;
241 struct net_device *lower_dev;
242
243 lower_dev = repr->dst->u.port_info.lower_dev;
244
245 lower_features = lower_dev->features;
246 if (lower_features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
247 lower_features |= NETIF_F_HW_CSUM;
248
249 features = netdev_intersect_features(features, lower_features);
250 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_HW_TC);
251 features |= NETIF_F_LLTX;
252
253 return features;
254 }
255
256 const struct net_device_ops nfp_repr_netdev_ops = {
257 .ndo_init = nfp_app_ndo_init,
258 .ndo_uninit = nfp_app_ndo_uninit,
259 .ndo_open = nfp_repr_open,
260 .ndo_stop = nfp_repr_stop,
261 .ndo_start_xmit = nfp_repr_xmit,
262 .ndo_change_mtu = nfp_repr_change_mtu,
263 .ndo_get_stats64 = nfp_repr_get_stats64,
264 .ndo_has_offload_stats = nfp_repr_has_offload_stats,
265 .ndo_get_offload_stats = nfp_repr_get_offload_stats,
266 .ndo_get_phys_port_name = nfp_port_get_phys_port_name,
267 .ndo_setup_tc = nfp_port_setup_tc,
268 .ndo_set_vf_mac = nfp_app_set_vf_mac,
269 .ndo_set_vf_vlan = nfp_app_set_vf_vlan,
270 .ndo_set_vf_spoofchk = nfp_app_set_vf_spoofchk,
271 .ndo_set_vf_trust = nfp_app_set_vf_trust,
272 .ndo_get_vf_config = nfp_app_get_vf_config,
273 .ndo_set_vf_link_state = nfp_app_set_vf_link_state,
274 .ndo_fix_features = nfp_repr_fix_features,
275 .ndo_set_features = nfp_port_set_features,
276 .ndo_set_mac_address = eth_mac_addr,
277 .ndo_get_port_parent_id = nfp_port_get_port_parent_id,
278 .ndo_get_devlink_port = nfp_devlink_get_devlink_port,
279 };
280
281 void
nfp_repr_transfer_features(struct net_device * netdev,struct net_device * lower)282 nfp_repr_transfer_features(struct net_device *netdev, struct net_device *lower)
283 {
284 struct nfp_repr *repr = netdev_priv(netdev);
285
286 if (repr->dst->u.port_info.lower_dev != lower)
287 return;
288
289 netif_inherit_tso_max(netdev, lower);
290
291 netdev_update_features(netdev);
292 }
293
nfp_repr_clean(struct nfp_repr * repr)294 static void nfp_repr_clean(struct nfp_repr *repr)
295 {
296 unregister_netdev(repr->netdev);
297 nfp_app_repr_clean(repr->app, repr->netdev);
298 dst_release((struct dst_entry *)repr->dst);
299 nfp_port_free(repr->port);
300 }
301
302 static struct lock_class_key nfp_repr_netdev_xmit_lock_key;
303
nfp_repr_set_lockdep_class_one(struct net_device * dev,struct netdev_queue * txq,void * _unused)304 static void nfp_repr_set_lockdep_class_one(struct net_device *dev,
305 struct netdev_queue *txq,
306 void *_unused)
307 {
308 lockdep_set_class(&txq->_xmit_lock, &nfp_repr_netdev_xmit_lock_key);
309 }
310
nfp_repr_set_lockdep_class(struct net_device * dev)311 static void nfp_repr_set_lockdep_class(struct net_device *dev)
312 {
313 netdev_for_each_tx_queue(dev, nfp_repr_set_lockdep_class_one, NULL);
314 }
315
nfp_repr_init(struct nfp_app * app,struct net_device * netdev,u32 cmsg_port_id,struct nfp_port * port,struct net_device * pf_netdev)316 int nfp_repr_init(struct nfp_app *app, struct net_device *netdev,
317 u32 cmsg_port_id, struct nfp_port *port,
318 struct net_device *pf_netdev)
319 {
320 struct nfp_repr *repr = netdev_priv(netdev);
321 struct nfp_net *nn = netdev_priv(pf_netdev);
322 u32 repr_cap = nn->tlv_caps.repr_cap;
323 int err;
324
325 nfp_repr_set_lockdep_class(netdev);
326
327 repr->port = port;
328 repr->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX, GFP_KERNEL);
329 if (!repr->dst)
330 return -ENOMEM;
331 repr->dst->u.port_info.port_id = cmsg_port_id;
332 repr->dst->u.port_info.lower_dev = pf_netdev;
333
334 netdev->netdev_ops = &nfp_repr_netdev_ops;
335 netdev->ethtool_ops = &nfp_port_ethtool_ops;
336
337 netdev->max_mtu = pf_netdev->max_mtu;
338
339 /* Set features the lower device can support with representors */
340 if (repr_cap & NFP_NET_CFG_CTRL_LIVE_ADDR)
341 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
342
343 netdev->hw_features = NETIF_F_HIGHDMA;
344 if (repr_cap & NFP_NET_CFG_CTRL_RXCSUM_ANY)
345 netdev->hw_features |= NETIF_F_RXCSUM;
346 if (repr_cap & NFP_NET_CFG_CTRL_TXCSUM)
347 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
348 if (repr_cap & NFP_NET_CFG_CTRL_GATHER)
349 netdev->hw_features |= NETIF_F_SG;
350 if ((repr_cap & NFP_NET_CFG_CTRL_LSO && nn->fw_ver.major > 2) ||
351 repr_cap & NFP_NET_CFG_CTRL_LSO2)
352 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
353 if (repr_cap & NFP_NET_CFG_CTRL_RSS_ANY)
354 netdev->hw_features |= NETIF_F_RXHASH;
355 if (repr_cap & NFP_NET_CFG_CTRL_VXLAN) {
356 if (repr_cap & NFP_NET_CFG_CTRL_LSO)
357 netdev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;
358 }
359 if (repr_cap & NFP_NET_CFG_CTRL_NVGRE) {
360 if (repr_cap & NFP_NET_CFG_CTRL_LSO)
361 netdev->hw_features |= NETIF_F_GSO_GRE;
362 }
363 if (repr_cap & (NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE))
364 netdev->hw_enc_features = netdev->hw_features;
365
366 netdev->vlan_features = netdev->hw_features;
367
368 if (repr_cap & NFP_NET_CFG_CTRL_RXVLAN)
369 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
370 if (repr_cap & NFP_NET_CFG_CTRL_TXVLAN) {
371 if (repr_cap & NFP_NET_CFG_CTRL_LSO2)
372 netdev_warn(netdev, "Device advertises both TSO2 and TXVLAN. Refusing to enable TXVLAN.\n");
373 else
374 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX;
375 }
376 if (repr_cap & NFP_NET_CFG_CTRL_CTAG_FILTER)
377 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER;
378
379 netdev->features = netdev->hw_features;
380
381 /* Advertise but disable TSO by default. */
382 netdev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
383 netif_set_tso_max_segs(netdev, NFP_NET_LSO_MAX_SEGS);
384
385 netdev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
386 netdev->features |= NETIF_F_LLTX;
387
388 if (nfp_app_has_tc(app)) {
389 netdev->features |= NETIF_F_HW_TC;
390 netdev->hw_features |= NETIF_F_HW_TC;
391 }
392
393 err = nfp_app_repr_init(app, netdev);
394 if (err)
395 goto err_clean;
396
397 err = register_netdev(netdev);
398 if (err)
399 goto err_repr_clean;
400
401 return 0;
402
403 err_repr_clean:
404 nfp_app_repr_clean(app, netdev);
405 err_clean:
406 dst_release((struct dst_entry *)repr->dst);
407 return err;
408 }
409
__nfp_repr_free(struct nfp_repr * repr)410 static void __nfp_repr_free(struct nfp_repr *repr)
411 {
412 free_percpu(repr->stats);
413 free_netdev(repr->netdev);
414 }
415
nfp_repr_free(struct net_device * netdev)416 void nfp_repr_free(struct net_device *netdev)
417 {
418 __nfp_repr_free(netdev_priv(netdev));
419 }
420
421 struct net_device *
nfp_repr_alloc_mqs(struct nfp_app * app,unsigned int txqs,unsigned int rxqs)422 nfp_repr_alloc_mqs(struct nfp_app *app, unsigned int txqs, unsigned int rxqs)
423 {
424 struct net_device *netdev;
425 struct nfp_repr *repr;
426
427 netdev = alloc_etherdev_mqs(sizeof(*repr), txqs, rxqs);
428 if (!netdev)
429 return NULL;
430
431 netif_carrier_off(netdev);
432
433 repr = netdev_priv(netdev);
434 repr->netdev = netdev;
435 repr->app = app;
436
437 repr->stats = netdev_alloc_pcpu_stats(struct nfp_repr_pcpu_stats);
438 if (!repr->stats)
439 goto err_free_netdev;
440
441 return netdev;
442
443 err_free_netdev:
444 free_netdev(netdev);
445 return NULL;
446 }
447
nfp_repr_clean_and_free(struct nfp_repr * repr)448 void nfp_repr_clean_and_free(struct nfp_repr *repr)
449 {
450 nfp_info(repr->app->cpp, "Destroying Representor(%s)\n",
451 repr->netdev->name);
452 nfp_repr_clean(repr);
453 __nfp_repr_free(repr);
454 }
455
nfp_reprs_clean_and_free(struct nfp_app * app,struct nfp_reprs * reprs)456 void nfp_reprs_clean_and_free(struct nfp_app *app, struct nfp_reprs *reprs)
457 {
458 struct net_device *netdev;
459 unsigned int i;
460
461 for (i = 0; i < reprs->num_reprs; i++) {
462 netdev = nfp_repr_get_locked(app, reprs, i);
463 if (netdev)
464 nfp_repr_clean_and_free(netdev_priv(netdev));
465 }
466
467 kfree(reprs);
468 }
469
470 void
nfp_reprs_clean_and_free_by_type(struct nfp_app * app,enum nfp_repr_type type)471 nfp_reprs_clean_and_free_by_type(struct nfp_app *app, enum nfp_repr_type type)
472 {
473 struct net_device *netdev;
474 struct nfp_reprs *reprs;
475 int i;
476
477 reprs = rcu_dereference_protected(app->reprs[type],
478 nfp_app_is_locked(app));
479 if (!reprs)
480 return;
481
482 /* Preclean must happen before we remove the reprs reference from the
483 * app below.
484 */
485 for (i = 0; i < reprs->num_reprs; i++) {
486 netdev = nfp_repr_get_locked(app, reprs, i);
487 if (netdev)
488 nfp_app_repr_preclean(app, netdev);
489 }
490
491 reprs = nfp_app_reprs_set(app, type, NULL);
492
493 synchronize_rcu();
494 nfp_reprs_clean_and_free(app, reprs);
495 }
496
nfp_reprs_alloc(unsigned int num_reprs)497 struct nfp_reprs *nfp_reprs_alloc(unsigned int num_reprs)
498 {
499 struct nfp_reprs *reprs;
500
501 reprs = kzalloc(struct_size(reprs, reprs, num_reprs), GFP_KERNEL);
502 if (!reprs)
503 return NULL;
504 reprs->num_reprs = num_reprs;
505
506 return reprs;
507 }
508
nfp_reprs_resync_phys_ports(struct nfp_app * app)509 int nfp_reprs_resync_phys_ports(struct nfp_app *app)
510 {
511 struct net_device *netdev;
512 struct nfp_reprs *reprs;
513 struct nfp_repr *repr;
514 int i;
515
516 reprs = nfp_reprs_get_locked(app, NFP_REPR_TYPE_PHYS_PORT);
517 if (!reprs)
518 return 0;
519
520 for (i = 0; i < reprs->num_reprs; i++) {
521 netdev = nfp_repr_get_locked(app, reprs, i);
522 if (!netdev)
523 continue;
524
525 repr = netdev_priv(netdev);
526 if (repr->port->type != NFP_PORT_INVALID)
527 continue;
528
529 nfp_app_repr_preclean(app, netdev);
530 rtnl_lock();
531 rcu_assign_pointer(reprs->reprs[i], NULL);
532 rtnl_unlock();
533 synchronize_rcu();
534 nfp_repr_clean(repr);
535 }
536
537 return 0;
538 }
539