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 					 nfp_app_is_locked(app));
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(&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
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 };
279 
280 void
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 
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 
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 
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 
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 
413 static void __nfp_repr_free(struct nfp_repr *repr)
414 {
415 	free_percpu(repr->stats);
416 	free_netdev(repr->netdev);
417 }
418 
419 void nfp_repr_free(struct net_device *netdev)
420 {
421 	__nfp_repr_free(netdev_priv(netdev));
422 }
423 
424 struct net_device *
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 
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 
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
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 
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 
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