net/smc/smc_pnet.c

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