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 *
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 					 lockdep_is_held(&app->pf->lock));
24 }
25 
26 static void
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 
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
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
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
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
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
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
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 
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 
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 
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 
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
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
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 	netdev->gso_max_size = lower->gso_max_size;
290 	netdev->gso_max_segs = lower->gso_max_segs;
291 
292 	netdev_update_features(netdev);
293 }
294 
295 static void nfp_repr_clean(struct nfp_repr *repr)
296 {
297 	unregister_netdev(repr->netdev);
298 	nfp_app_repr_clean(repr->app, repr->netdev);
299 	dst_release((struct dst_entry *)repr->dst);
300 	nfp_port_free(repr->port);
301 }
302 
303 static struct lock_class_key nfp_repr_netdev_xmit_lock_key;
304 
305 static void nfp_repr_set_lockdep_class_one(struct net_device *dev,
306 					   struct netdev_queue *txq,
307 					   void *_unused)
308 {
309 	lockdep_set_class(&txq->_xmit_lock, &nfp_repr_netdev_xmit_lock_key);
310 }
311 
312 static void nfp_repr_set_lockdep_class(struct net_device *dev)
313 {
314 	netdev_for_each_tx_queue(dev, nfp_repr_set_lockdep_class_one, NULL);
315 }
316 
317 int nfp_repr_init(struct nfp_app *app, struct net_device *netdev,
318 		  u32 cmsg_port_id, struct nfp_port *port,
319 		  struct net_device *pf_netdev)
320 {
321 	struct nfp_repr *repr = netdev_priv(netdev);
322 	struct nfp_net *nn = netdev_priv(pf_netdev);
323 	u32 repr_cap = nn->tlv_caps.repr_cap;
324 	int err;
325 
326 	nfp_repr_set_lockdep_class(netdev);
327 
328 	repr->port = port;
329 	repr->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX, GFP_KERNEL);
330 	if (!repr->dst)
331 		return -ENOMEM;
332 	repr->dst->u.port_info.port_id = cmsg_port_id;
333 	repr->dst->u.port_info.lower_dev = pf_netdev;
334 
335 	netdev->netdev_ops = &nfp_repr_netdev_ops;
336 	netdev->ethtool_ops = &nfp_port_ethtool_ops;
337 
338 	netdev->max_mtu = pf_netdev->max_mtu;
339 
340 	/* Set features the lower device can support with representors */
341 	if (repr_cap & NFP_NET_CFG_CTRL_LIVE_ADDR)
342 		netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
343 
344 	netdev->hw_features = NETIF_F_HIGHDMA;
345 	if (repr_cap & NFP_NET_CFG_CTRL_RXCSUM_ANY)
346 		netdev->hw_features |= NETIF_F_RXCSUM;
347 	if (repr_cap & NFP_NET_CFG_CTRL_TXCSUM)
348 		netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
349 	if (repr_cap & NFP_NET_CFG_CTRL_GATHER)
350 		netdev->hw_features |= NETIF_F_SG;
351 	if ((repr_cap & NFP_NET_CFG_CTRL_LSO && nn->fw_ver.major > 2) ||
352 	    repr_cap & NFP_NET_CFG_CTRL_LSO2)
353 		netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
354 	if (repr_cap & NFP_NET_CFG_CTRL_RSS_ANY)
355 		netdev->hw_features |= NETIF_F_RXHASH;
356 	if (repr_cap & NFP_NET_CFG_CTRL_VXLAN) {
357 		if (repr_cap & NFP_NET_CFG_CTRL_LSO)
358 			netdev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;
359 	}
360 	if (repr_cap & NFP_NET_CFG_CTRL_NVGRE) {
361 		if (repr_cap & NFP_NET_CFG_CTRL_LSO)
362 			netdev->hw_features |= NETIF_F_GSO_GRE;
363 	}
364 	if (repr_cap & (NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE))
365 		netdev->hw_enc_features = netdev->hw_features;
366 
367 	netdev->vlan_features = netdev->hw_features;
368 
369 	if (repr_cap & NFP_NET_CFG_CTRL_RXVLAN)
370 		netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
371 	if (repr_cap & NFP_NET_CFG_CTRL_TXVLAN) {
372 		if (repr_cap & NFP_NET_CFG_CTRL_LSO2)
373 			netdev_warn(netdev, "Device advertises both TSO2 and TXVLAN. Refusing to enable TXVLAN.\n");
374 		else
375 			netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX;
376 	}
377 	if (repr_cap & NFP_NET_CFG_CTRL_CTAG_FILTER)
378 		netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER;
379 
380 	netdev->features = netdev->hw_features;
381 
382 	/* Advertise but disable TSO by default. */
383 	netdev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
384 	netdev->gso_max_segs = NFP_NET_LSO_MAX_SEGS;
385 
386 	netdev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
387 	netdev->features |= NETIF_F_LLTX;
388 
389 	if (nfp_app_has_tc(app)) {
390 		netdev->features |= NETIF_F_HW_TC;
391 		netdev->hw_features |= NETIF_F_HW_TC;
392 	}
393 
394 	err = nfp_app_repr_init(app, netdev);
395 	if (err)
396 		goto err_clean;
397 
398 	err = register_netdev(netdev);
399 	if (err)
400 		goto err_repr_clean;
401 
402 	return 0;
403 
404 err_repr_clean:
405 	nfp_app_repr_clean(app, netdev);
406 err_clean:
407 	dst_release((struct dst_entry *)repr->dst);
408 	return err;
409 }
410 
411 static void __nfp_repr_free(struct nfp_repr *repr)
412 {
413 	free_percpu(repr->stats);
414 	free_netdev(repr->netdev);
415 }
416 
417 void nfp_repr_free(struct net_device *netdev)
418 {
419 	__nfp_repr_free(netdev_priv(netdev));
420 }
421 
422 struct net_device *
423 nfp_repr_alloc_mqs(struct nfp_app *app, unsigned int txqs, unsigned int rxqs)
424 {
425 	struct net_device *netdev;
426 	struct nfp_repr *repr;
427 
428 	netdev = alloc_etherdev_mqs(sizeof(*repr), txqs, rxqs);
429 	if (!netdev)
430 		return NULL;
431 
432 	netif_carrier_off(netdev);
433 
434 	repr = netdev_priv(netdev);
435 	repr->netdev = netdev;
436 	repr->app = app;
437 
438 	repr->stats = netdev_alloc_pcpu_stats(struct nfp_repr_pcpu_stats);
439 	if (!repr->stats)
440 		goto err_free_netdev;
441 
442 	return netdev;
443 
444 err_free_netdev:
445 	free_netdev(netdev);
446 	return NULL;
447 }
448 
449 void nfp_repr_clean_and_free(struct nfp_repr *repr)
450 {
451 	nfp_info(repr->app->cpp, "Destroying Representor(%s)\n",
452 		 repr->netdev->name);
453 	nfp_repr_clean(repr);
454 	__nfp_repr_free(repr);
455 }
456 
457 void nfp_reprs_clean_and_free(struct nfp_app *app, struct nfp_reprs *reprs)
458 {
459 	struct net_device *netdev;
460 	unsigned int i;
461 
462 	for (i = 0; i < reprs->num_reprs; i++) {
463 		netdev = nfp_repr_get_locked(app, reprs, i);
464 		if (netdev)
465 			nfp_repr_clean_and_free(netdev_priv(netdev));
466 	}
467 
468 	kfree(reprs);
469 }
470 
471 void
472 nfp_reprs_clean_and_free_by_type(struct nfp_app *app, enum nfp_repr_type type)
473 {
474 	struct net_device *netdev;
475 	struct nfp_reprs *reprs;
476 	int i;
477 
478 	reprs = rcu_dereference_protected(app->reprs[type],
479 					  lockdep_is_held(&app->pf->lock));
480 	if (!reprs)
481 		return;
482 
483 	/* Preclean must happen before we remove the reprs reference from the
484 	 * app below.
485 	 */
486 	for (i = 0; i < reprs->num_reprs; i++) {
487 		netdev = nfp_repr_get_locked(app, reprs, i);
488 		if (netdev)
489 			nfp_app_repr_preclean(app, netdev);
490 	}
491 
492 	reprs = nfp_app_reprs_set(app, type, NULL);
493 
494 	synchronize_rcu();
495 	nfp_reprs_clean_and_free(app, reprs);
496 }
497 
498 struct nfp_reprs *nfp_reprs_alloc(unsigned int num_reprs)
499 {
500 	struct nfp_reprs *reprs;
501 
502 	reprs = kzalloc(sizeof(*reprs) +
503 			num_reprs * sizeof(struct net_device *), GFP_KERNEL);
504 	if (!reprs)
505 		return NULL;
506 	reprs->num_reprs = num_reprs;
507 
508 	return reprs;
509 }
510 
511 int nfp_reprs_resync_phys_ports(struct nfp_app *app)
512 {
513 	struct net_device *netdev;
514 	struct nfp_reprs *reprs;
515 	struct nfp_repr *repr;
516 	int i;
517 
518 	reprs = nfp_reprs_get_locked(app, NFP_REPR_TYPE_PHYS_PORT);
519 	if (!reprs)
520 		return 0;
521 
522 	for (i = 0; i < reprs->num_reprs; i++) {
523 		netdev = nfp_repr_get_locked(app, reprs, i);
524 		if (!netdev)
525 			continue;
526 
527 		repr = netdev_priv(netdev);
528 		if (repr->port->type != NFP_PORT_INVALID)
529 			continue;
530 
531 		nfp_app_repr_preclean(app, netdev);
532 		rtnl_lock();
533 		rcu_assign_pointer(reprs->reprs[i], NULL);
534 		rtnl_unlock();
535 		synchronize_rcu();
536 		nfp_repr_clean(repr);
537 	}
538 
539 	return 0;
540 }
541