1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
4  *
5  *  Generic netlink support functions to configure an SMC-R PNET table
6  *
7  *  Copyright IBM Corp. 2016
8  *
9  *  Author(s):  Thomas Richter <tmricht@linux.vnet.ibm.com>
10  */
11 
12 #include <linux/module.h>
13 #include <linux/list.h>
14 #include <linux/ctype.h>
15 #include <linux/mutex.h>
16 #include <net/netlink.h>
17 #include <net/genetlink.h>
18 
19 #include <uapi/linux/if.h>
20 #include <uapi/linux/smc.h>
21 
22 #include <rdma/ib_verbs.h>
23 
24 #include <net/netns/generic.h>
25 #include "smc_netns.h"
26 
27 #include "smc_pnet.h"
28 #include "smc_ib.h"
29 #include "smc_ism.h"
30 #include "smc_core.h"
31 
32 static struct net_device *__pnet_find_base_ndev(struct net_device *ndev);
33 static struct net_device *pnet_find_base_ndev(struct net_device *ndev);
34 
35 static const struct nla_policy smc_pnet_policy[SMC_PNETID_MAX + 1] = {
36 	[SMC_PNETID_NAME] = {
37 		.type = NLA_NUL_STRING,
38 		.len = SMC_MAX_PNETID_LEN
39 	},
40 	[SMC_PNETID_ETHNAME] = {
41 		.type = NLA_NUL_STRING,
42 		.len = IFNAMSIZ - 1
43 	},
44 	[SMC_PNETID_IBNAME] = {
45 		.type = NLA_NUL_STRING,
46 		.len = IB_DEVICE_NAME_MAX - 1
47 	},
48 	[SMC_PNETID_IBPORT] = { .type = NLA_U8 }
49 };
50 
51 static struct genl_family smc_pnet_nl_family;
52 
53 enum smc_pnet_nametype {
54 	SMC_PNET_ETH	= 1,
55 	SMC_PNET_IB	= 2,
56 };
57 
58 /* pnet entry stored in pnet table */
59 struct smc_pnetentry {
60 	struct list_head list;
61 	char pnet_name[SMC_MAX_PNETID_LEN + 1];
62 	enum smc_pnet_nametype type;
63 	union {
64 		struct {
65 			char eth_name[IFNAMSIZ + 1];
66 			struct net_device *ndev;
67 			netdevice_tracker dev_tracker;
68 		};
69 		struct {
70 			char ib_name[IB_DEVICE_NAME_MAX + 1];
71 			u8 ib_port;
72 		};
73 	};
74 };
75 
76 /* Check if the pnetid is set */
smc_pnet_is_pnetid_set(u8 * pnetid)77 bool smc_pnet_is_pnetid_set(u8 *pnetid)
78 {
79 	if (pnetid[0] == 0 || pnetid[0] == _S)
80 		return false;
81 	return true;
82 }
83 
84 /* Check if two given pnetids match */
smc_pnet_match(u8 * pnetid1,u8 * pnetid2)85 static bool smc_pnet_match(u8 *pnetid1, u8 *pnetid2)
86 {
87 	int i;
88 
89 	for (i = 0; i < SMC_MAX_PNETID_LEN; i++) {
90 		if ((pnetid1[i] == 0 || pnetid1[i] == _S) &&
91 		    (pnetid2[i] == 0 || pnetid2[i] == _S))
92 			break;
93 		if (pnetid1[i] != pnetid2[i])
94 			return false;
95 	}
96 	return true;
97 }
98 
99 /* Remove a pnetid from the pnet table.
100  */
smc_pnet_remove_by_pnetid(struct net * net,char * pnet_name)101 static int smc_pnet_remove_by_pnetid(struct net *net, char *pnet_name)
102 {
103 	struct smc_pnetentry *pnetelem, *tmp_pe;
104 	struct smc_pnettable *pnettable;
105 	struct smc_ib_device *ibdev;
106 	struct smcd_dev *smcd_dev;
107 	struct smc_net *sn;
108 	int rc = -ENOENT;
109 	int ibport;
110 
111 	/* get pnettable for namespace */
112 	sn = net_generic(net, smc_net_id);
113 	pnettable = &sn->pnettable;
114 
115 	/* remove table entry */
116 	mutex_lock(&pnettable->lock);
117 	list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist,
118 				 list) {
119 		if (!pnet_name ||
120 		    smc_pnet_match(pnetelem->pnet_name, pnet_name)) {
121 			list_del(&pnetelem->list);
122 			if (pnetelem->type == SMC_PNET_ETH && pnetelem->ndev) {
123 				dev_put_track(pnetelem->ndev, &pnetelem->dev_tracker);
124 				pr_warn_ratelimited("smc: net device %s "
125 						    "erased user defined "
126 						    "pnetid %.16s\n",
127 						    pnetelem->eth_name,
128 						    pnetelem->pnet_name);
129 			}
130 			kfree(pnetelem);
131 			rc = 0;
132 		}
133 	}
134 	mutex_unlock(&pnettable->lock);
135 
136 	/* if this is not the initial namespace, stop here */
137 	if (net != &init_net)
138 		return rc;
139 
140 	/* remove ib devices */
141 	mutex_lock(&smc_ib_devices.mutex);
142 	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
143 		for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
144 			if (ibdev->pnetid_by_user[ibport] &&
145 			    (!pnet_name ||
146 			     smc_pnet_match(pnet_name,
147 					    ibdev->pnetid[ibport]))) {
148 				pr_warn_ratelimited("smc: ib device %s ibport "
149 						    "%d erased user defined "
150 						    "pnetid %.16s\n",
151 						    ibdev->ibdev->name,
152 						    ibport + 1,
153 						    ibdev->pnetid[ibport]);
154 				memset(ibdev->pnetid[ibport], 0,
155 				       SMC_MAX_PNETID_LEN);
156 				ibdev->pnetid_by_user[ibport] = false;
157 				rc = 0;
158 			}
159 		}
160 	}
161 	mutex_unlock(&smc_ib_devices.mutex);
162 	/* remove smcd devices */
163 	mutex_lock(&smcd_dev_list.mutex);
164 	list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
165 		if (smcd_dev->pnetid_by_user &&
166 		    (!pnet_name ||
167 		     smc_pnet_match(pnet_name, smcd_dev->pnetid))) {
168 			pr_warn_ratelimited("smc: smcd device %s "
169 					    "erased user defined pnetid "
170 					    "%.16s\n", dev_name(&smcd_dev->dev),
171 					    smcd_dev->pnetid);
172 			memset(smcd_dev->pnetid, 0, SMC_MAX_PNETID_LEN);
173 			smcd_dev->pnetid_by_user = false;
174 			rc = 0;
175 		}
176 	}
177 	mutex_unlock(&smcd_dev_list.mutex);
178 	return rc;
179 }
180 
181 /* Add the reference to a given network device to the pnet table.
182  */
smc_pnet_add_by_ndev(struct net_device * ndev)183 static int smc_pnet_add_by_ndev(struct net_device *ndev)
184 {
185 	struct smc_pnetentry *pnetelem, *tmp_pe;
186 	struct smc_pnettable *pnettable;
187 	struct net *net = dev_net(ndev);
188 	struct smc_net *sn;
189 	int rc = -ENOENT;
190 
191 	/* get pnettable for namespace */
192 	sn = net_generic(net, smc_net_id);
193 	pnettable = &sn->pnettable;
194 
195 	mutex_lock(&pnettable->lock);
196 	list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
197 		if (pnetelem->type == SMC_PNET_ETH && !pnetelem->ndev &&
198 		    !strncmp(pnetelem->eth_name, ndev->name, IFNAMSIZ)) {
199 			dev_hold_track(ndev, &pnetelem->dev_tracker, GFP_ATOMIC);
200 			pnetelem->ndev = ndev;
201 			rc = 0;
202 			pr_warn_ratelimited("smc: adding net device %s with "
203 					    "user defined pnetid %.16s\n",
204 					    pnetelem->eth_name,
205 					    pnetelem->pnet_name);
206 			break;
207 		}
208 	}
209 	mutex_unlock(&pnettable->lock);
210 	return rc;
211 }
212 
213 /* Remove the reference to a given network device from the pnet table.
214  */
smc_pnet_remove_by_ndev(struct net_device * ndev)215 static int smc_pnet_remove_by_ndev(struct net_device *ndev)
216 {
217 	struct smc_pnetentry *pnetelem, *tmp_pe;
218 	struct smc_pnettable *pnettable;
219 	struct net *net = dev_net(ndev);
220 	struct smc_net *sn;
221 	int rc = -ENOENT;
222 
223 	/* get pnettable for namespace */
224 	sn = net_generic(net, smc_net_id);
225 	pnettable = &sn->pnettable;
226 
227 	mutex_lock(&pnettable->lock);
228 	list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
229 		if (pnetelem->type == SMC_PNET_ETH && pnetelem->ndev == ndev) {
230 			dev_put_track(pnetelem->ndev, &pnetelem->dev_tracker);
231 			pnetelem->ndev = NULL;
232 			rc = 0;
233 			pr_warn_ratelimited("smc: removing net device %s with "
234 					    "user defined pnetid %.16s\n",
235 					    pnetelem->eth_name,
236 					    pnetelem->pnet_name);
237 			break;
238 		}
239 	}
240 	mutex_unlock(&pnettable->lock);
241 	return rc;
242 }
243 
244 /* Apply pnetid to ib device when no pnetid is set.
245  */
smc_pnet_apply_ib(struct smc_ib_device * ib_dev,u8 ib_port,char * pnet_name)246 static bool smc_pnet_apply_ib(struct smc_ib_device *ib_dev, u8 ib_port,
247 			      char *pnet_name)
248 {
249 	bool applied = false;
250 
251 	mutex_lock(&smc_ib_devices.mutex);
252 	if (!smc_pnet_is_pnetid_set(ib_dev->pnetid[ib_port - 1])) {
253 		memcpy(ib_dev->pnetid[ib_port - 1], pnet_name,
254 		       SMC_MAX_PNETID_LEN);
255 		ib_dev->pnetid_by_user[ib_port - 1] = true;
256 		applied = true;
257 	}
258 	mutex_unlock(&smc_ib_devices.mutex);
259 	return applied;
260 }
261 
262 /* Apply pnetid to smcd device when no pnetid is set.
263  */
smc_pnet_apply_smcd(struct smcd_dev * smcd_dev,char * pnet_name)264 static bool smc_pnet_apply_smcd(struct smcd_dev *smcd_dev, char *pnet_name)
265 {
266 	bool applied = false;
267 
268 	mutex_lock(&smcd_dev_list.mutex);
269 	if (!smc_pnet_is_pnetid_set(smcd_dev->pnetid)) {
270 		memcpy(smcd_dev->pnetid, pnet_name, SMC_MAX_PNETID_LEN);
271 		smcd_dev->pnetid_by_user = true;
272 		applied = true;
273 	}
274 	mutex_unlock(&smcd_dev_list.mutex);
275 	return applied;
276 }
277 
278 /* The limit for pnetid is 16 characters.
279  * Valid characters should be (single-byte character set) a-z, A-Z, 0-9.
280  * Lower case letters are converted to upper case.
281  * Interior blanks should not be used.
282  */
smc_pnetid_valid(const char * pnet_name,char * pnetid)283 static bool smc_pnetid_valid(const char *pnet_name, char *pnetid)
284 {
285 	char *bf = skip_spaces(pnet_name);
286 	size_t len = strlen(bf);
287 	char *end = bf + len;
288 
289 	if (!len)
290 		return false;
291 	while (--end >= bf && isspace(*end))
292 		;
293 	if (end - bf >= SMC_MAX_PNETID_LEN)
294 		return false;
295 	while (bf <= end) {
296 		if (!isalnum(*bf))
297 			return false;
298 		*pnetid++ = islower(*bf) ? toupper(*bf) : *bf;
299 		bf++;
300 	}
301 	*pnetid = '\0';
302 	return true;
303 }
304 
305 /* Find an infiniband device by a given name. The device might not exist. */
smc_pnet_find_ib(char * ib_name)306 static struct smc_ib_device *smc_pnet_find_ib(char *ib_name)
307 {
308 	struct smc_ib_device *ibdev;
309 
310 	mutex_lock(&smc_ib_devices.mutex);
311 	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
312 		if (!strncmp(ibdev->ibdev->name, ib_name,
313 			     sizeof(ibdev->ibdev->name)) ||
314 		    (ibdev->ibdev->dev.parent &&
315 		     !strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
316 			     IB_DEVICE_NAME_MAX - 1))) {
317 			goto out;
318 		}
319 	}
320 	ibdev = NULL;
321 out:
322 	mutex_unlock(&smc_ib_devices.mutex);
323 	return ibdev;
324 }
325 
326 /* Find an smcd device by a given name. The device might not exist. */
smc_pnet_find_smcd(char * smcd_name)327 static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
328 {
329 	struct smcd_dev *smcd_dev;
330 
331 	mutex_lock(&smcd_dev_list.mutex);
332 	list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
333 		if (!strncmp(dev_name(&smcd_dev->dev), smcd_name,
334 			     IB_DEVICE_NAME_MAX - 1))
335 			goto out;
336 	}
337 	smcd_dev = NULL;
338 out:
339 	mutex_unlock(&smcd_dev_list.mutex);
340 	return smcd_dev;
341 }
342 
smc_pnet_add_eth(struct smc_pnettable * pnettable,struct net * net,char * eth_name,char * pnet_name)343 static int smc_pnet_add_eth(struct smc_pnettable *pnettable, struct net *net,
344 			    char *eth_name, char *pnet_name)
345 {
346 	struct smc_pnetentry *tmp_pe, *new_pe;
347 	struct net_device *ndev, *base_ndev;
348 	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
349 	bool new_netdev;
350 	int rc;
351 
352 	/* check if (base) netdev already has a pnetid. If there is one, we do
353 	 * not want to add a pnet table entry
354 	 */
355 	rc = -EEXIST;
356 	ndev = dev_get_by_name(net, eth_name);	/* dev_hold() */
357 	if (ndev) {
358 		base_ndev = pnet_find_base_ndev(ndev);
359 		if (!smc_pnetid_by_dev_port(base_ndev->dev.parent,
360 					    base_ndev->dev_port, ndev_pnetid))
361 			goto out_put;
362 	}
363 
364 	/* add a new netdev entry to the pnet table if there isn't one */
365 	rc = -ENOMEM;
366 	new_pe = kzalloc(sizeof(*new_pe), GFP_KERNEL);
367 	if (!new_pe)
368 		goto out_put;
369 	new_pe->type = SMC_PNET_ETH;
370 	memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN);
371 	strncpy(new_pe->eth_name, eth_name, IFNAMSIZ);
372 	rc = -EEXIST;
373 	new_netdev = true;
374 	mutex_lock(&pnettable->lock);
375 	list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
376 		if (tmp_pe->type == SMC_PNET_ETH &&
377 		    !strncmp(tmp_pe->eth_name, eth_name, IFNAMSIZ)) {
378 			new_netdev = false;
379 			break;
380 		}
381 	}
382 	if (new_netdev) {
383 		if (ndev) {
384 			new_pe->ndev = ndev;
385 			netdev_tracker_alloc(ndev, &new_pe->dev_tracker,
386 					     GFP_ATOMIC);
387 		}
388 		list_add_tail(&new_pe->list, &pnettable->pnetlist);
389 		mutex_unlock(&pnettable->lock);
390 	} else {
391 		mutex_unlock(&pnettable->lock);
392 		kfree(new_pe);
393 		goto out_put;
394 	}
395 	if (ndev)
396 		pr_warn_ratelimited("smc: net device %s "
397 				    "applied user defined pnetid %.16s\n",
398 				    new_pe->eth_name, new_pe->pnet_name);
399 	return 0;
400 
401 out_put:
402 	dev_put(ndev);
403 	return rc;
404 }
405 
smc_pnet_add_ib(struct smc_pnettable * pnettable,char * ib_name,u8 ib_port,char * pnet_name)406 static int smc_pnet_add_ib(struct smc_pnettable *pnettable, char *ib_name,
407 			   u8 ib_port, char *pnet_name)
408 {
409 	struct smc_pnetentry *tmp_pe, *new_pe;
410 	struct smc_ib_device *ib_dev;
411 	bool smcddev_applied = true;
412 	bool ibdev_applied = true;
413 	struct smcd_dev *smcd_dev;
414 	bool new_ibdev;
415 
416 	/* try to apply the pnetid to active devices */
417 	ib_dev = smc_pnet_find_ib(ib_name);
418 	if (ib_dev) {
419 		ibdev_applied = smc_pnet_apply_ib(ib_dev, ib_port, pnet_name);
420 		if (ibdev_applied)
421 			pr_warn_ratelimited("smc: ib device %s ibport %d "
422 					    "applied user defined pnetid "
423 					    "%.16s\n", ib_dev->ibdev->name,
424 					    ib_port,
425 					    ib_dev->pnetid[ib_port - 1]);
426 	}
427 	smcd_dev = smc_pnet_find_smcd(ib_name);
428 	if (smcd_dev) {
429 		smcddev_applied = smc_pnet_apply_smcd(smcd_dev, pnet_name);
430 		if (smcddev_applied)
431 			pr_warn_ratelimited("smc: smcd device %s "
432 					    "applied user defined pnetid "
433 					    "%.16s\n", dev_name(&smcd_dev->dev),
434 					    smcd_dev->pnetid);
435 	}
436 	/* Apply fails when a device has a hardware-defined pnetid set, do not
437 	 * add a pnet table entry in that case.
438 	 */
439 	if (!ibdev_applied || !smcddev_applied)
440 		return -EEXIST;
441 
442 	/* add a new ib entry to the pnet table if there isn't one */
443 	new_pe = kzalloc(sizeof(*new_pe), GFP_KERNEL);
444 	if (!new_pe)
445 		return -ENOMEM;
446 	new_pe->type = SMC_PNET_IB;
447 	memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN);
448 	strncpy(new_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX);
449 	new_pe->ib_port = ib_port;
450 
451 	new_ibdev = true;
452 	mutex_lock(&pnettable->lock);
453 	list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
454 		if (tmp_pe->type == SMC_PNET_IB &&
455 		    !strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX)) {
456 			new_ibdev = false;
457 			break;
458 		}
459 	}
460 	if (new_ibdev) {
461 		list_add_tail(&new_pe->list, &pnettable->pnetlist);
462 		mutex_unlock(&pnettable->lock);
463 	} else {
464 		mutex_unlock(&pnettable->lock);
465 		kfree(new_pe);
466 	}
467 	return (new_ibdev) ? 0 : -EEXIST;
468 }
469 
470 /* Append a pnetid to the end of the pnet table if not already on this list.
471  */
smc_pnet_enter(struct net * net,struct nlattr * tb[])472 static int smc_pnet_enter(struct net *net, struct nlattr *tb[])
473 {
474 	char pnet_name[SMC_MAX_PNETID_LEN + 1];
475 	struct smc_pnettable *pnettable;
476 	bool new_netdev = false;
477 	bool new_ibdev = false;
478 	struct smc_net *sn;
479 	u8 ibport = 1;
480 	char *string;
481 	int rc;
482 
483 	/* get pnettable for namespace */
484 	sn = net_generic(net, smc_net_id);
485 	pnettable = &sn->pnettable;
486 
487 	rc = -EINVAL;
488 	if (!tb[SMC_PNETID_NAME])
489 		goto error;
490 	string = (char *)nla_data(tb[SMC_PNETID_NAME]);
491 	if (!smc_pnetid_valid(string, pnet_name))
492 		goto error;
493 
494 	if (tb[SMC_PNETID_ETHNAME]) {
495 		string = (char *)nla_data(tb[SMC_PNETID_ETHNAME]);
496 		rc = smc_pnet_add_eth(pnettable, net, string, pnet_name);
497 		if (!rc)
498 			new_netdev = true;
499 		else if (rc != -EEXIST)
500 			goto error;
501 	}
502 
503 	/* if this is not the initial namespace, stop here */
504 	if (net != &init_net)
505 		return new_netdev ? 0 : -EEXIST;
506 
507 	rc = -EINVAL;
508 	if (tb[SMC_PNETID_IBNAME]) {
509 		string = (char *)nla_data(tb[SMC_PNETID_IBNAME]);
510 		string = strim(string);
511 		if (tb[SMC_PNETID_IBPORT]) {
512 			ibport = nla_get_u8(tb[SMC_PNETID_IBPORT]);
513 			if (ibport < 1 || ibport > SMC_MAX_PORTS)
514 				goto error;
515 		}
516 		rc = smc_pnet_add_ib(pnettable, string, ibport, pnet_name);
517 		if (!rc)
518 			new_ibdev = true;
519 		else if (rc != -EEXIST)
520 			goto error;
521 	}
522 	return (new_netdev || new_ibdev) ? 0 : -EEXIST;
523 
524 error:
525 	return rc;
526 }
527 
528 /* Convert an smc_pnetentry to a netlink attribute sequence */
smc_pnet_set_nla(struct sk_buff * msg,struct smc_pnetentry * pnetelem)529 static int smc_pnet_set_nla(struct sk_buff *msg,
530 			    struct smc_pnetentry *pnetelem)
531 {
532 	if (nla_put_string(msg, SMC_PNETID_NAME, pnetelem->pnet_name))
533 		return -1;
534 	if (pnetelem->type == SMC_PNET_ETH) {
535 		if (nla_put_string(msg, SMC_PNETID_ETHNAME,
536 				   pnetelem->eth_name))
537 			return -1;
538 	} else {
539 		if (nla_put_string(msg, SMC_PNETID_ETHNAME, "n/a"))
540 			return -1;
541 	}
542 	if (pnetelem->type == SMC_PNET_IB) {
543 		if (nla_put_string(msg, SMC_PNETID_IBNAME, pnetelem->ib_name) ||
544 		    nla_put_u8(msg, SMC_PNETID_IBPORT, pnetelem->ib_port))
545 			return -1;
546 	} else {
547 		if (nla_put_string(msg, SMC_PNETID_IBNAME, "n/a") ||
548 		    nla_put_u8(msg, SMC_PNETID_IBPORT, 0xff))
549 			return -1;
550 	}
551 
552 	return 0;
553 }
554 
smc_pnet_add(struct sk_buff * skb,struct genl_info * info)555 static int smc_pnet_add(struct sk_buff *skb, struct genl_info *info)
556 {
557 	struct net *net = genl_info_net(info);
558 
559 	return smc_pnet_enter(net, info->attrs);
560 }
561 
smc_pnet_del(struct sk_buff * skb,struct genl_info * info)562 static int smc_pnet_del(struct sk_buff *skb, struct genl_info *info)
563 {
564 	struct net *net = genl_info_net(info);
565 
566 	if (!info->attrs[SMC_PNETID_NAME])
567 		return -EINVAL;
568 	return smc_pnet_remove_by_pnetid(net,
569 				(char *)nla_data(info->attrs[SMC_PNETID_NAME]));
570 }
571 
smc_pnet_dump_start(struct netlink_callback * cb)572 static int smc_pnet_dump_start(struct netlink_callback *cb)
573 {
574 	cb->args[0] = 0;
575 	return 0;
576 }
577 
smc_pnet_dumpinfo(struct sk_buff * skb,u32 portid,u32 seq,u32 flags,struct smc_pnetentry * pnetelem)578 static int smc_pnet_dumpinfo(struct sk_buff *skb,
579 			     u32 portid, u32 seq, u32 flags,
580 			     struct smc_pnetentry *pnetelem)
581 {
582 	void *hdr;
583 
584 	hdr = genlmsg_put(skb, portid, seq, &smc_pnet_nl_family,
585 			  flags, SMC_PNETID_GET);
586 	if (!hdr)
587 		return -ENOMEM;
588 	if (smc_pnet_set_nla(skb, pnetelem) < 0) {
589 		genlmsg_cancel(skb, hdr);
590 		return -EMSGSIZE;
591 	}
592 	genlmsg_end(skb, hdr);
593 	return 0;
594 }
595 
_smc_pnet_dump(struct net * net,struct sk_buff * skb,u32 portid,u32 seq,u8 * pnetid,int start_idx)596 static int _smc_pnet_dump(struct net *net, struct sk_buff *skb, u32 portid,
597 			  u32 seq, u8 *pnetid, int start_idx)
598 {
599 	struct smc_pnettable *pnettable;
600 	struct smc_pnetentry *pnetelem;
601 	struct smc_net *sn;
602 	int idx = 0;
603 
604 	/* get pnettable for namespace */
605 	sn = net_generic(net, smc_net_id);
606 	pnettable = &sn->pnettable;
607 
608 	/* dump pnettable entries */
609 	mutex_lock(&pnettable->lock);
610 	list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
611 		if (pnetid && !smc_pnet_match(pnetelem->pnet_name, pnetid))
612 			continue;
613 		if (idx++ < start_idx)
614 			continue;
615 		/* if this is not the initial namespace, dump only netdev */
616 		if (net != &init_net && pnetelem->type != SMC_PNET_ETH)
617 			continue;
618 		if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
619 				      pnetelem)) {
620 			--idx;
621 			break;
622 		}
623 	}
624 	mutex_unlock(&pnettable->lock);
625 	return idx;
626 }
627 
smc_pnet_dump(struct sk_buff * skb,struct netlink_callback * cb)628 static int smc_pnet_dump(struct sk_buff *skb, struct netlink_callback *cb)
629 {
630 	struct net *net = sock_net(skb->sk);
631 	int idx;
632 
633 	idx = _smc_pnet_dump(net, skb, NETLINK_CB(cb->skb).portid,
634 			     cb->nlh->nlmsg_seq, NULL, cb->args[0]);
635 
636 	cb->args[0] = idx;
637 	return skb->len;
638 }
639 
640 /* Retrieve one PNETID entry */
smc_pnet_get(struct sk_buff * skb,struct genl_info * info)641 static int smc_pnet_get(struct sk_buff *skb, struct genl_info *info)
642 {
643 	struct net *net = genl_info_net(info);
644 	struct sk_buff *msg;
645 	void *hdr;
646 
647 	if (!info->attrs[SMC_PNETID_NAME])
648 		return -EINVAL;
649 
650 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
651 	if (!msg)
652 		return -ENOMEM;
653 
654 	_smc_pnet_dump(net, msg, info->snd_portid, info->snd_seq,
655 		       nla_data(info->attrs[SMC_PNETID_NAME]), 0);
656 
657 	/* finish multi part message and send it */
658 	hdr = nlmsg_put(msg, info->snd_portid, info->snd_seq, NLMSG_DONE, 0,
659 			NLM_F_MULTI);
660 	if (!hdr) {
661 		nlmsg_free(msg);
662 		return -EMSGSIZE;
663 	}
664 	return genlmsg_reply(msg, info);
665 }
666 
667 /* Remove and delete all pnetids from pnet table.
668  */
smc_pnet_flush(struct sk_buff * skb,struct genl_info * info)669 static int smc_pnet_flush(struct sk_buff *skb, struct genl_info *info)
670 {
671 	struct net *net = genl_info_net(info);
672 
673 	smc_pnet_remove_by_pnetid(net, NULL);
674 	return 0;
675 }
676 
677 /* SMC_PNETID generic netlink operation definition */
678 static const struct genl_ops smc_pnet_ops[] = {
679 	{
680 		.cmd = SMC_PNETID_GET,
681 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
682 		/* can be retrieved by unprivileged users */
683 		.doit = smc_pnet_get,
684 		.dumpit = smc_pnet_dump,
685 		.start = smc_pnet_dump_start
686 	},
687 	{
688 		.cmd = SMC_PNETID_ADD,
689 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
690 		.flags = GENL_ADMIN_PERM,
691 		.doit = smc_pnet_add
692 	},
693 	{
694 		.cmd = SMC_PNETID_DEL,
695 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
696 		.flags = GENL_ADMIN_PERM,
697 		.doit = smc_pnet_del
698 	},
699 	{
700 		.cmd = SMC_PNETID_FLUSH,
701 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
702 		.flags = GENL_ADMIN_PERM,
703 		.doit = smc_pnet_flush
704 	}
705 };
706 
707 /* SMC_PNETID family definition */
708 static struct genl_family smc_pnet_nl_family __ro_after_init = {
709 	.hdrsize = 0,
710 	.name = SMCR_GENL_FAMILY_NAME,
711 	.version = SMCR_GENL_FAMILY_VERSION,
712 	.maxattr = SMC_PNETID_MAX,
713 	.policy = smc_pnet_policy,
714 	.netnsok = true,
715 	.module = THIS_MODULE,
716 	.ops = smc_pnet_ops,
717 	.n_ops =  ARRAY_SIZE(smc_pnet_ops)
718 };
719 
smc_pnet_is_ndev_pnetid(struct net * net,u8 * pnetid)720 bool smc_pnet_is_ndev_pnetid(struct net *net, u8 *pnetid)
721 {
722 	struct smc_net *sn = net_generic(net, smc_net_id);
723 	struct smc_pnetids_ndev_entry *pe;
724 	bool rc = false;
725 
726 	read_lock(&sn->pnetids_ndev.lock);
727 	list_for_each_entry(pe, &sn->pnetids_ndev.list, list) {
728 		if (smc_pnet_match(pnetid, pe->pnetid)) {
729 			rc = true;
730 			goto unlock;
731 		}
732 	}
733 
734 unlock:
735 	read_unlock(&sn->pnetids_ndev.lock);
736 	return rc;
737 }
738 
smc_pnet_add_pnetid(struct net * net,u8 * pnetid)739 static int smc_pnet_add_pnetid(struct net *net, u8 *pnetid)
740 {
741 	struct smc_net *sn = net_generic(net, smc_net_id);
742 	struct smc_pnetids_ndev_entry *pe, *pi;
743 
744 	pe = kzalloc(sizeof(*pe), GFP_KERNEL);
745 	if (!pe)
746 		return -ENOMEM;
747 
748 	write_lock(&sn->pnetids_ndev.lock);
749 	list_for_each_entry(pi, &sn->pnetids_ndev.list, list) {
750 		if (smc_pnet_match(pnetid, pe->pnetid)) {
751 			refcount_inc(&pi->refcnt);
752 			kfree(pe);
753 			goto unlock;
754 		}
755 	}
756 	refcount_set(&pe->refcnt, 1);
757 	memcpy(pe->pnetid, pnetid, SMC_MAX_PNETID_LEN);
758 	list_add_tail(&pe->list, &sn->pnetids_ndev.list);
759 
760 unlock:
761 	write_unlock(&sn->pnetids_ndev.lock);
762 	return 0;
763 }
764 
smc_pnet_remove_pnetid(struct net * net,u8 * pnetid)765 static void smc_pnet_remove_pnetid(struct net *net, u8 *pnetid)
766 {
767 	struct smc_net *sn = net_generic(net, smc_net_id);
768 	struct smc_pnetids_ndev_entry *pe, *pe2;
769 
770 	write_lock(&sn->pnetids_ndev.lock);
771 	list_for_each_entry_safe(pe, pe2, &sn->pnetids_ndev.list, list) {
772 		if (smc_pnet_match(pnetid, pe->pnetid)) {
773 			if (refcount_dec_and_test(&pe->refcnt)) {
774 				list_del(&pe->list);
775 				kfree(pe);
776 			}
777 			break;
778 		}
779 	}
780 	write_unlock(&sn->pnetids_ndev.lock);
781 }
782 
smc_pnet_add_base_pnetid(struct net * net,struct net_device * dev,u8 * ndev_pnetid)783 static void smc_pnet_add_base_pnetid(struct net *net, struct net_device *dev,
784 				     u8 *ndev_pnetid)
785 {
786 	struct net_device *base_dev;
787 
788 	base_dev = __pnet_find_base_ndev(dev);
789 	if (base_dev->flags & IFF_UP &&
790 	    !smc_pnetid_by_dev_port(base_dev->dev.parent, base_dev->dev_port,
791 				    ndev_pnetid)) {
792 		/* add to PNETIDs list */
793 		smc_pnet_add_pnetid(net, ndev_pnetid);
794 	}
795 }
796 
797 /* create initial list of netdevice pnetids */
smc_pnet_create_pnetids_list(struct net * net)798 static void smc_pnet_create_pnetids_list(struct net *net)
799 {
800 	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
801 	struct net_device *dev;
802 
803 	rtnl_lock();
804 	for_each_netdev(net, dev)
805 		smc_pnet_add_base_pnetid(net, dev, ndev_pnetid);
806 	rtnl_unlock();
807 }
808 
809 /* clean up list of netdevice pnetids */
smc_pnet_destroy_pnetids_list(struct net * net)810 static void smc_pnet_destroy_pnetids_list(struct net *net)
811 {
812 	struct smc_net *sn = net_generic(net, smc_net_id);
813 	struct smc_pnetids_ndev_entry *pe, *temp_pe;
814 
815 	write_lock(&sn->pnetids_ndev.lock);
816 	list_for_each_entry_safe(pe, temp_pe, &sn->pnetids_ndev.list, list) {
817 		list_del(&pe->list);
818 		kfree(pe);
819 	}
820 	write_unlock(&sn->pnetids_ndev.lock);
821 }
822 
smc_pnet_netdev_event(struct notifier_block * this,unsigned long event,void * ptr)823 static int smc_pnet_netdev_event(struct notifier_block *this,
824 				 unsigned long event, void *ptr)
825 {
826 	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
827 	struct net *net = dev_net(event_dev);
828 	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
829 
830 	switch (event) {
831 	case NETDEV_REBOOT:
832 	case NETDEV_UNREGISTER:
833 		smc_pnet_remove_by_ndev(event_dev);
834 		smc_ib_ndev_change(event_dev, event);
835 		return NOTIFY_OK;
836 	case NETDEV_REGISTER:
837 		smc_pnet_add_by_ndev(event_dev);
838 		smc_ib_ndev_change(event_dev, event);
839 		return NOTIFY_OK;
840 	case NETDEV_UP:
841 		smc_pnet_add_base_pnetid(net, event_dev, ndev_pnetid);
842 		return NOTIFY_OK;
843 	case NETDEV_DOWN:
844 		event_dev = __pnet_find_base_ndev(event_dev);
845 		if (!smc_pnetid_by_dev_port(event_dev->dev.parent,
846 					    event_dev->dev_port, ndev_pnetid)) {
847 			/* remove from PNETIDs list */
848 			smc_pnet_remove_pnetid(net, ndev_pnetid);
849 		}
850 		return NOTIFY_OK;
851 	default:
852 		return NOTIFY_DONE;
853 	}
854 }
855 
856 static struct notifier_block smc_netdev_notifier = {
857 	.notifier_call = smc_pnet_netdev_event
858 };
859 
860 /* init network namespace */
smc_pnet_net_init(struct net * net)861 int smc_pnet_net_init(struct net *net)
862 {
863 	struct smc_net *sn = net_generic(net, smc_net_id);
864 	struct smc_pnettable *pnettable = &sn->pnettable;
865 	struct smc_pnetids_ndev *pnetids_ndev = &sn->pnetids_ndev;
866 
867 	INIT_LIST_HEAD(&pnettable->pnetlist);
868 	mutex_init(&pnettable->lock);
869 	INIT_LIST_HEAD(&pnetids_ndev->list);
870 	rwlock_init(&pnetids_ndev->lock);
871 
872 	smc_pnet_create_pnetids_list(net);
873 
874 	/* disable handshake limitation by default */
875 	net->smc.limit_smc_hs = 0;
876 
877 	return 0;
878 }
879 
smc_pnet_init(void)880 int __init smc_pnet_init(void)
881 {
882 	int rc;
883 
884 	rc = genl_register_family(&smc_pnet_nl_family);
885 	if (rc)
886 		return rc;
887 	rc = register_netdevice_notifier(&smc_netdev_notifier);
888 	if (rc)
889 		genl_unregister_family(&smc_pnet_nl_family);
890 
891 	return rc;
892 }
893 
894 /* exit network namespace */
smc_pnet_net_exit(struct net * net)895 void smc_pnet_net_exit(struct net *net)
896 {
897 	/* flush pnet table */
898 	smc_pnet_remove_by_pnetid(net, NULL);
899 	smc_pnet_destroy_pnetids_list(net);
900 }
901 
smc_pnet_exit(void)902 void smc_pnet_exit(void)
903 {
904 	unregister_netdevice_notifier(&smc_netdev_notifier);
905 	genl_unregister_family(&smc_pnet_nl_family);
906 }
907 
__pnet_find_base_ndev(struct net_device * ndev)908 static struct net_device *__pnet_find_base_ndev(struct net_device *ndev)
909 {
910 	int i, nest_lvl;
911 
912 	ASSERT_RTNL();
913 	nest_lvl = ndev->lower_level;
914 	for (i = 0; i < nest_lvl; i++) {
915 		struct list_head *lower = &ndev->adj_list.lower;
916 
917 		if (list_empty(lower))
918 			break;
919 		lower = lower->next;
920 		ndev = netdev_lower_get_next(ndev, &lower);
921 	}
922 	return ndev;
923 }
924 
925 /* Determine one base device for stacked net devices.
926  * If the lower device level contains more than one devices
927  * (for instance with bonding slaves), just the first device
928  * is used to reach a base device.
929  */
pnet_find_base_ndev(struct net_device * ndev)930 static struct net_device *pnet_find_base_ndev(struct net_device *ndev)
931 {
932 	rtnl_lock();
933 	ndev = __pnet_find_base_ndev(ndev);
934 	rtnl_unlock();
935 	return ndev;
936 }
937 
smc_pnet_find_ndev_pnetid_by_table(struct net_device * ndev,u8 * pnetid)938 static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
939 					      u8 *pnetid)
940 {
941 	struct smc_pnettable *pnettable;
942 	struct net *net = dev_net(ndev);
943 	struct smc_pnetentry *pnetelem;
944 	struct smc_net *sn;
945 	int rc = -ENOENT;
946 
947 	/* get pnettable for namespace */
948 	sn = net_generic(net, smc_net_id);
949 	pnettable = &sn->pnettable;
950 
951 	mutex_lock(&pnettable->lock);
952 	list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
953 		if (pnetelem->type == SMC_PNET_ETH && ndev == pnetelem->ndev) {
954 			/* get pnetid of netdev device */
955 			memcpy(pnetid, pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
956 			rc = 0;
957 			break;
958 		}
959 	}
960 	mutex_unlock(&pnettable->lock);
961 	return rc;
962 }
963 
smc_pnet_determine_gid(struct smc_ib_device * ibdev,int i,struct smc_init_info * ini)964 static int smc_pnet_determine_gid(struct smc_ib_device *ibdev, int i,
965 				  struct smc_init_info *ini)
966 {
967 	if (!ini->check_smcrv2 &&
968 	    !smc_ib_determine_gid(ibdev, i, ini->vlan_id, ini->ib_gid, NULL,
969 				  NULL)) {
970 		ini->ib_dev = ibdev;
971 		ini->ib_port = i;
972 		return 0;
973 	}
974 	if (ini->check_smcrv2 &&
975 	    !smc_ib_determine_gid(ibdev, i, ini->vlan_id, ini->smcrv2.ib_gid_v2,
976 				  NULL, &ini->smcrv2)) {
977 		ini->smcrv2.ib_dev_v2 = ibdev;
978 		ini->smcrv2.ib_port_v2 = i;
979 		return 0;
980 	}
981 	return -ENODEV;
982 }
983 
984 /* find a roce device for the given pnetid */
_smc_pnet_find_roce_by_pnetid(u8 * pnet_id,struct smc_init_info * ini,struct smc_ib_device * known_dev,struct net * net)985 static void _smc_pnet_find_roce_by_pnetid(u8 *pnet_id,
986 					  struct smc_init_info *ini,
987 					  struct smc_ib_device *known_dev,
988 					  struct net *net)
989 {
990 	struct smc_ib_device *ibdev;
991 	int i;
992 
993 	mutex_lock(&smc_ib_devices.mutex);
994 	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
995 		if (ibdev == known_dev ||
996 		    !rdma_dev_access_netns(ibdev->ibdev, net))
997 			continue;
998 		for (i = 1; i <= SMC_MAX_PORTS; i++) {
999 			if (!rdma_is_port_valid(ibdev->ibdev, i))
1000 				continue;
1001 			if (smc_pnet_match(ibdev->pnetid[i - 1], pnet_id) &&
1002 			    smc_ib_port_active(ibdev, i) &&
1003 			    !test_bit(i - 1, ibdev->ports_going_away)) {
1004 				if (!smc_pnet_determine_gid(ibdev, i, ini))
1005 					goto out;
1006 			}
1007 		}
1008 	}
1009 out:
1010 	mutex_unlock(&smc_ib_devices.mutex);
1011 }
1012 
1013 /* find alternate roce device with same pnet_id, vlan_id and net namespace */
smc_pnet_find_alt_roce(struct smc_link_group * lgr,struct smc_init_info * ini,struct smc_ib_device * known_dev)1014 void smc_pnet_find_alt_roce(struct smc_link_group *lgr,
1015 			    struct smc_init_info *ini,
1016 			    struct smc_ib_device *known_dev)
1017 {
1018 	struct net *net = lgr->net;
1019 
1020 	_smc_pnet_find_roce_by_pnetid(lgr->pnet_id, ini, known_dev, net);
1021 }
1022 
1023 /* if handshake network device belongs to a roce device, return its
1024  * IB device and port
1025  */
smc_pnet_find_rdma_dev(struct net_device * netdev,struct smc_init_info * ini)1026 static void smc_pnet_find_rdma_dev(struct net_device *netdev,
1027 				   struct smc_init_info *ini)
1028 {
1029 	struct net *net = dev_net(netdev);
1030 	struct smc_ib_device *ibdev;
1031 
1032 	mutex_lock(&smc_ib_devices.mutex);
1033 	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
1034 		struct net_device *ndev;
1035 		int i;
1036 
1037 		/* check rdma net namespace */
1038 		if (!rdma_dev_access_netns(ibdev->ibdev, net))
1039 			continue;
1040 
1041 		for (i = 1; i <= SMC_MAX_PORTS; i++) {
1042 			if (!rdma_is_port_valid(ibdev->ibdev, i))
1043 				continue;
1044 			if (!ibdev->ibdev->ops.get_netdev)
1045 				continue;
1046 			ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
1047 			if (!ndev)
1048 				continue;
1049 			dev_put(ndev);
1050 			if (netdev == ndev &&
1051 			    smc_ib_port_active(ibdev, i) &&
1052 			    !test_bit(i - 1, ibdev->ports_going_away)) {
1053 				if (!smc_pnet_determine_gid(ibdev, i, ini))
1054 					break;
1055 			}
1056 		}
1057 	}
1058 	mutex_unlock(&smc_ib_devices.mutex);
1059 }
1060 
1061 /* Determine the corresponding IB device port based on the hardware PNETID.
1062  * Searching stops at the first matching active IB device port with vlan_id
1063  * configured.
1064  * If nothing found, check pnetid table.
1065  * If nothing found, try to use handshake device
1066  */
smc_pnet_find_roce_by_pnetid(struct net_device * ndev,struct smc_init_info * ini)1067 static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
1068 					 struct smc_init_info *ini)
1069 {
1070 	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
1071 	struct net *net;
1072 
1073 	ndev = pnet_find_base_ndev(ndev);
1074 	net = dev_net(ndev);
1075 	if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
1076 				   ndev_pnetid) &&
1077 	    smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid)) {
1078 		smc_pnet_find_rdma_dev(ndev, ini);
1079 		return; /* pnetid could not be determined */
1080 	}
1081 	_smc_pnet_find_roce_by_pnetid(ndev_pnetid, ini, NULL, net);
1082 }
1083 
smc_pnet_find_ism_by_pnetid(struct net_device * ndev,struct smc_init_info * ini)1084 static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
1085 					struct smc_init_info *ini)
1086 {
1087 	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
1088 	struct smcd_dev *ismdev;
1089 
1090 	ndev = pnet_find_base_ndev(ndev);
1091 	if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
1092 				   ndev_pnetid) &&
1093 	    smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid))
1094 		return; /* pnetid could not be determined */
1095 
1096 	mutex_lock(&smcd_dev_list.mutex);
1097 	list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
1098 		if (smc_pnet_match(ismdev->pnetid, ndev_pnetid) &&
1099 		    !ismdev->going_away &&
1100 		    (!ini->ism_peer_gid[0] ||
1101 		     !smc_ism_cantalk(ini->ism_peer_gid[0], ini->vlan_id,
1102 				      ismdev))) {
1103 			ini->ism_dev[0] = ismdev;
1104 			break;
1105 		}
1106 	}
1107 	mutex_unlock(&smcd_dev_list.mutex);
1108 }
1109 
1110 /* PNET table analysis for a given sock:
1111  * determine ib_device and port belonging to used internal TCP socket
1112  * ethernet interface.
1113  */
smc_pnet_find_roce_resource(struct sock * sk,struct smc_init_info * ini)1114 void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini)
1115 {
1116 	struct dst_entry *dst = sk_dst_get(sk);
1117 
1118 	if (!dst)
1119 		goto out;
1120 	if (!dst->dev)
1121 		goto out_rel;
1122 
1123 	smc_pnet_find_roce_by_pnetid(dst->dev, ini);
1124 
1125 out_rel:
1126 	dst_release(dst);
1127 out:
1128 	return;
1129 }
1130 
smc_pnet_find_ism_resource(struct sock * sk,struct smc_init_info * ini)1131 void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini)
1132 {
1133 	struct dst_entry *dst = sk_dst_get(sk);
1134 
1135 	ini->ism_dev[0] = NULL;
1136 	if (!dst)
1137 		goto out;
1138 	if (!dst->dev)
1139 		goto out_rel;
1140 
1141 	smc_pnet_find_ism_by_pnetid(dst->dev, ini);
1142 
1143 out_rel:
1144 	dst_release(dst);
1145 out:
1146 	return;
1147 }
1148 
1149 /* Lookup and apply a pnet table entry to the given ib device.
1150  */
smc_pnetid_by_table_ib(struct smc_ib_device * smcibdev,u8 ib_port)1151 int smc_pnetid_by_table_ib(struct smc_ib_device *smcibdev, u8 ib_port)
1152 {
1153 	char *ib_name = smcibdev->ibdev->name;
1154 	struct smc_pnettable *pnettable;
1155 	struct smc_pnetentry *tmp_pe;
1156 	struct smc_net *sn;
1157 	int rc = -ENOENT;
1158 
1159 	/* get pnettable for init namespace */
1160 	sn = net_generic(&init_net, smc_net_id);
1161 	pnettable = &sn->pnettable;
1162 
1163 	mutex_lock(&pnettable->lock);
1164 	list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
1165 		if (tmp_pe->type == SMC_PNET_IB &&
1166 		    !strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX) &&
1167 		    tmp_pe->ib_port == ib_port) {
1168 			smc_pnet_apply_ib(smcibdev, ib_port, tmp_pe->pnet_name);
1169 			rc = 0;
1170 			break;
1171 		}
1172 	}
1173 	mutex_unlock(&pnettable->lock);
1174 
1175 	return rc;
1176 }
1177 
1178 /* Lookup and apply a pnet table entry to the given smcd device.
1179  */
smc_pnetid_by_table_smcd(struct smcd_dev * smcddev)1180 int smc_pnetid_by_table_smcd(struct smcd_dev *smcddev)
1181 {
1182 	const char *ib_name = dev_name(&smcddev->dev);
1183 	struct smc_pnettable *pnettable;
1184 	struct smc_pnetentry *tmp_pe;
1185 	struct smc_net *sn;
1186 	int rc = -ENOENT;
1187 
1188 	/* get pnettable for init namespace */
1189 	sn = net_generic(&init_net, smc_net_id);
1190 	pnettable = &sn->pnettable;
1191 
1192 	mutex_lock(&pnettable->lock);
1193 	list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
1194 		if (tmp_pe->type == SMC_PNET_IB &&
1195 		    !strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX)) {
1196 			smc_pnet_apply_smcd(smcddev, tmp_pe->pnet_name);
1197 			rc = 0;
1198 			break;
1199 		}
1200 	}
1201 	mutex_unlock(&pnettable->lock);
1202 
1203 	return rc;
1204 }
1205