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(&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(&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 };
279
280 void
nfp_repr_transfer_features(struct net_device * netdev,struct net_device * lower)281 nfp_repr_transfer_features(struct net_device *netdev, struct net_device *lower)
282 {
283 struct nfp_repr *repr = netdev_priv(netdev);
284
285 if (repr->dst->u.port_info.lower_dev != lower)
286 return;
287
288 netif_inherit_tso_max(netdev, lower);
289
290 netdev_update_features(netdev);
291 }
292
nfp_repr_clean(struct nfp_repr * repr)293 static void nfp_repr_clean(struct nfp_repr *repr)
294 {
295 unregister_netdev(repr->netdev);
296 nfp_app_repr_clean(repr->app, repr->netdev);
297 dst_release((struct dst_entry *)repr->dst);
298 nfp_port_free(repr->port);
299 }
300
301 static struct lock_class_key nfp_repr_netdev_xmit_lock_key;
302
nfp_repr_set_lockdep_class_one(struct net_device * dev,struct netdev_queue * txq,void * _unused)303 static void nfp_repr_set_lockdep_class_one(struct net_device *dev,
304 struct netdev_queue *txq,
305 void *_unused)
306 {
307 lockdep_set_class(&txq->_xmit_lock, &nfp_repr_netdev_xmit_lock_key);
308 }
309
nfp_repr_set_lockdep_class(struct net_device * dev)310 static void nfp_repr_set_lockdep_class(struct net_device *dev)
311 {
312 netdev_for_each_tx_queue(dev, nfp_repr_set_lockdep_class_one, NULL);
313 }
314
nfp_repr_init(struct nfp_app * app,struct net_device * netdev,u32 cmsg_port_id,struct nfp_port * port,struct net_device * pf_netdev)315 int nfp_repr_init(struct nfp_app *app, struct net_device *netdev,
316 u32 cmsg_port_id, struct nfp_port *port,
317 struct net_device *pf_netdev)
318 {
319 struct nfp_repr *repr = netdev_priv(netdev);
320 struct nfp_net *nn = netdev_priv(pf_netdev);
321 u32 repr_cap = nn->tlv_caps.repr_cap;
322 int err;
323
324 nfp_repr_set_lockdep_class(netdev);
325
326 repr->port = port;
327 repr->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX, GFP_KERNEL);
328 if (!repr->dst)
329 return -ENOMEM;
330 repr->dst->u.port_info.port_id = cmsg_port_id;
331 repr->dst->u.port_info.lower_dev = pf_netdev;
332
333 netdev->netdev_ops = &nfp_repr_netdev_ops;
334 netdev->ethtool_ops = &nfp_port_ethtool_ops;
335
336 netdev->max_mtu = pf_netdev->max_mtu;
337
338 /* Set features the lower device can support with representors */
339 if (repr_cap & NFP_NET_CFG_CTRL_LIVE_ADDR)
340 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
341
342 netdev->hw_features = NETIF_F_HIGHDMA;
343 if (repr_cap & NFP_NET_CFG_CTRL_RXCSUM_ANY)
344 netdev->hw_features |= NETIF_F_RXCSUM;
345 if (repr_cap & NFP_NET_CFG_CTRL_TXCSUM)
346 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
347 if (repr_cap & NFP_NET_CFG_CTRL_GATHER)
348 netdev->hw_features |= NETIF_F_SG;
349 if ((repr_cap & NFP_NET_CFG_CTRL_LSO && nn->fw_ver.major > 2) ||
350 repr_cap & NFP_NET_CFG_CTRL_LSO2)
351 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
352 if (repr_cap & NFP_NET_CFG_CTRL_RSS_ANY)
353 netdev->hw_features |= NETIF_F_RXHASH;
354 if (repr_cap & NFP_NET_CFG_CTRL_VXLAN) {
355 if (repr_cap & NFP_NET_CFG_CTRL_LSO)
356 netdev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;
357 }
358 if (repr_cap & NFP_NET_CFG_CTRL_NVGRE) {
359 if (repr_cap & NFP_NET_CFG_CTRL_LSO)
360 netdev->hw_features |= NETIF_F_GSO_GRE;
361 }
362 if (repr_cap & (NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE))
363 netdev->hw_enc_features = netdev->hw_features;
364
365 netdev->vlan_features = netdev->hw_features;
366
367 if (repr_cap & NFP_NET_CFG_CTRL_RXVLAN_ANY)
368 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
369 if (repr_cap & NFP_NET_CFG_CTRL_TXVLAN_ANY) {
370 if (repr_cap & NFP_NET_CFG_CTRL_LSO2)
371 netdev_warn(netdev, "Device advertises both TSO2 and TXVLAN. Refusing to enable TXVLAN.\n");
372 else
373 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX;
374 }
375 if (repr_cap & NFP_NET_CFG_CTRL_CTAG_FILTER)
376 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER;
377 if (repr_cap & NFP_NET_CFG_CTRL_RXQINQ)
378 netdev->hw_features |= NETIF_F_HW_VLAN_STAG_RX;
379
380 netdev->features = netdev->hw_features;
381
382 /* C-Tag strip and S-Tag strip can't be supported simultaneously,
383 * so enable C-Tag strip and disable S-Tag strip by default.
384 */
385 netdev->features &= ~NETIF_F_HW_VLAN_STAG_RX;
386 netif_set_tso_max_segs(netdev, NFP_NET_LSO_MAX_SEGS);
387
388 netdev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
389 netdev->features |= NETIF_F_LLTX;
390
391 if (nfp_app_has_tc(app)) {
392 netdev->features |= NETIF_F_HW_TC;
393 netdev->hw_features |= NETIF_F_HW_TC;
394 }
395
396 err = nfp_app_repr_init(app, netdev);
397 if (err)
398 goto err_clean;
399
400 err = register_netdev(netdev);
401 if (err)
402 goto err_repr_clean;
403
404 return 0;
405
406 err_repr_clean:
407 nfp_app_repr_clean(app, netdev);
408 err_clean:
409 dst_release((struct dst_entry *)repr->dst);
410 return err;
411 }
412
__nfp_repr_free(struct nfp_repr * repr)413 static void __nfp_repr_free(struct nfp_repr *repr)
414 {
415 free_percpu(repr->stats);
416 free_netdev(repr->netdev);
417 }
418
nfp_repr_free(struct net_device * netdev)419 void nfp_repr_free(struct net_device *netdev)
420 {
421 __nfp_repr_free(netdev_priv(netdev));
422 }
423
424 struct net_device *
nfp_repr_alloc_mqs(struct nfp_app * app,unsigned int txqs,unsigned int rxqs)425 nfp_repr_alloc_mqs(struct nfp_app *app, unsigned int txqs, unsigned int rxqs)
426 {
427 struct net_device *netdev;
428 struct nfp_repr *repr;
429
430 netdev = alloc_etherdev_mqs(sizeof(*repr), txqs, rxqs);
431 if (!netdev)
432 return NULL;
433
434 netif_carrier_off(netdev);
435
436 repr = netdev_priv(netdev);
437 repr->netdev = netdev;
438 repr->app = app;
439
440 repr->stats = netdev_alloc_pcpu_stats(struct nfp_repr_pcpu_stats);
441 if (!repr->stats)
442 goto err_free_netdev;
443
444 return netdev;
445
446 err_free_netdev:
447 free_netdev(netdev);
448 return NULL;
449 }
450
nfp_repr_clean_and_free(struct nfp_repr * repr)451 void nfp_repr_clean_and_free(struct nfp_repr *repr)
452 {
453 nfp_info(repr->app->cpp, "Destroying Representor(%s)\n",
454 repr->netdev->name);
455 nfp_repr_clean(repr);
456 __nfp_repr_free(repr);
457 }
458
nfp_reprs_clean_and_free(struct nfp_app * app,struct nfp_reprs * reprs)459 void nfp_reprs_clean_and_free(struct nfp_app *app, struct nfp_reprs *reprs)
460 {
461 struct net_device *netdev;
462 unsigned int i;
463
464 for (i = 0; i < reprs->num_reprs; i++) {
465 netdev = nfp_repr_get_locked(app, reprs, i);
466 if (netdev)
467 nfp_repr_clean_and_free(netdev_priv(netdev));
468 }
469
470 kfree(reprs);
471 }
472
473 void
nfp_reprs_clean_and_free_by_type(struct nfp_app * app,enum nfp_repr_type type)474 nfp_reprs_clean_and_free_by_type(struct nfp_app *app, enum nfp_repr_type type)
475 {
476 struct net_device *netdev;
477 struct nfp_reprs *reprs;
478 int i;
479
480 reprs = rcu_dereference_protected(app->reprs[type],
481 nfp_app_is_locked(app));
482 if (!reprs)
483 return;
484
485 /* Preclean must happen before we remove the reprs reference from the
486 * app below.
487 */
488 for (i = 0; i < reprs->num_reprs; i++) {
489 netdev = nfp_repr_get_locked(app, reprs, i);
490 if (netdev)
491 nfp_app_repr_preclean(app, netdev);
492 }
493
494 reprs = nfp_app_reprs_set(app, type, NULL);
495
496 synchronize_rcu();
497 nfp_reprs_clean_and_free(app, reprs);
498 }
499
nfp_reprs_alloc(unsigned int num_reprs)500 struct nfp_reprs *nfp_reprs_alloc(unsigned int num_reprs)
501 {
502 struct nfp_reprs *reprs;
503
504 reprs = kzalloc(struct_size(reprs, reprs, num_reprs), GFP_KERNEL);
505 if (!reprs)
506 return NULL;
507 reprs->num_reprs = num_reprs;
508
509 return reprs;
510 }
511
nfp_reprs_resync_phys_ports(struct nfp_app * app)512 int nfp_reprs_resync_phys_ports(struct nfp_app *app)
513 {
514 struct net_device *netdev;
515 struct nfp_reprs *reprs;
516 struct nfp_repr *repr;
517 int i;
518
519 reprs = nfp_reprs_get_locked(app, NFP_REPR_TYPE_PHYS_PORT);
520 if (!reprs)
521 return 0;
522
523 for (i = 0; i < reprs->num_reprs; i++) {
524 netdev = nfp_repr_get_locked(app, reprs, i);
525 if (!netdev)
526 continue;
527
528 repr = netdev_priv(netdev);
529 if (repr->port->type != NFP_PORT_INVALID)
530 continue;
531
532 nfp_app_repr_preclean(app, netdev);
533 rtnl_lock();
534 rcu_assign_pointer(reprs->reprs[i], NULL);
535 rtnl_unlock();
536 synchronize_rcu();
537 nfp_repr_clean(repr);
538 }
539
540 return 0;
541 }
542