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 <net/netlink.h>
  16 #include <net/genetlink.h>
  17
  18 #include <uapi/linux/if.h>
  19 #include <uapi/linux/smc.h>
  20
  21 #include <rdma/ib_verbs.h>
  22
  23 #include <net/netns/generic.h>
  24 #include "smc_netns.h"
  25
  26 #include "smc_pnet.h"
  27 #include "smc_ib.h"
  28 #include "smc_ism.h"
  29 #include "smc_core.h"
  30
  31 #define SMC_ASCII_BLANK 32
  32
  33 static struct net_device *pnet_find_base_ndev(struct net_device *ndev);
  34
  35 static 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 /**
  54  * struct smc_user_pnetentry - pnet identifier name entry for/from user
  55  * @list: List node.
  56  * @pnet_name: Pnet identifier name
  57  * @ndev: pointer to network device.
  58  * @smcibdev: Pointer to IB device.
  59  * @ib_port: Port of IB device.
  60  * @smcd_dev: Pointer to smcd device.
  61  */
  62 struct smc_user_pnetentry {
  63         struct list_head list;
  64         char pnet_name[SMC_MAX_PNETID_LEN + 1];
  65         struct net_device *ndev;
  66         struct smc_ib_device *smcibdev;
  67         u8 ib_port;
  68         struct smcd_dev *smcd_dev;
  69 };
  70
  71 /* pnet entry stored in pnet table */
  72 struct smc_pnetentry {
  73         struct list_head list;
  74         char pnet_name[SMC_MAX_PNETID_LEN + 1];
  75         struct net_device *ndev;
  76 };
  77
  78 /* Check if two given pnetids match */
  79 static bool smc_pnet_match(u8 *pnetid1, u8 *pnetid2)
  80 {
  81         int i;
  82
  83         for (i = 0; i < SMC_MAX_PNETID_LEN; i++) {
  84                 if ((pnetid1[i] == 0 || pnetid1[i] == SMC_ASCII_BLANK) &&
  85                     (pnetid2[i] == 0 || pnetid2[i] == SMC_ASCII_BLANK))
  86                         break;
  87                 if (pnetid1[i] != pnetid2[i])
  88                         return false;
  89         }
  90         return true;
  91 }
  92
  93 /* Remove a pnetid from the pnet table.
  94  */
  95 static int smc_pnet_remove_by_pnetid(struct net *net, char *pnet_name)
  96 {
  97         struct smc_pnetentry *pnetelem, *tmp_pe;
  98         struct smc_pnettable *pnettable;
  99         struct smc_ib_device *ibdev;
 100         struct smcd_dev *smcd_dev;
 101         struct smc_net *sn;
 102         int rc = -ENOENT;
 103         int ibport;
 104
 105         /* get pnettable for namespace */
 106         sn = net_generic(net, smc_net_id);
 107         pnettable = &sn->pnettable;
 108
 109         /* remove netdevices */
 110         write_lock(&pnettable->lock);
 111         list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist,
 112                                  list) {
 113                 if (!pnet_name ||
 114                     smc_pnet_match(pnetelem->pnet_name, pnet_name)) {
 115                         list_del(&pnetelem->list);
 116                         dev_put(pnetelem->ndev);
 117                         kfree(pnetelem);
 118                         rc = 0;
 119                 }
 120         }
 121         write_unlock(&pnettable->lock);
 122
 123         /* if this is not the initial namespace, stop here */
 124         if (net != &init_net)
 125                 return rc;
 126
 127         /* remove ib devices */
 128         spin_lock(&smc_ib_devices.lock);
 129         list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
 130                 for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
 131                         if (ibdev->pnetid_by_user[ibport] &&
 132                             (!pnet_name ||
 133                              smc_pnet_match(pnet_name,
 134                                             ibdev->pnetid[ibport]))) {
 135                                 memset(ibdev->pnetid[ibport], 0,
 136                                        SMC_MAX_PNETID_LEN);
 137                                 ibdev->pnetid_by_user[ibport] = false;
 138                                 rc = 0;
 139                         }
 140                 }
 141         }
 142         spin_unlock(&smc_ib_devices.lock);
 143         /* remove smcd devices */
 144         spin_lock(&smcd_dev_list.lock);
 145         list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
 146                 if (smcd_dev->pnetid_by_user &&
 147                     (!pnet_name ||
 148                      smc_pnet_match(pnet_name, smcd_dev->pnetid))) {
 149                         memset(smcd_dev->pnetid, 0, SMC_MAX_PNETID_LEN);
 150                         smcd_dev->pnetid_by_user = false;
 151                         rc = 0;
 152                 }
 153         }
 154         spin_unlock(&smcd_dev_list.lock);
 155         return rc;
 156 }
 157
 158 /* Remove a pnet entry mentioning a given network device from the pnet table.
 159  */
 160 static int smc_pnet_remove_by_ndev(struct net_device *ndev)
 161 {
 162         struct smc_pnetentry *pnetelem, *tmp_pe;
 163         struct smc_pnettable *pnettable;
 164         struct net *net = dev_net(ndev);
 165         struct smc_net *sn;
 166         int rc = -ENOENT;
 167
 168         /* get pnettable for namespace */
 169         sn = net_generic(net, smc_net_id);
 170         pnettable = &sn->pnettable;
 171
 172         write_lock(&pnettable->lock);
 173         list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
 174                 if (pnetelem->ndev == ndev) {
 175                         list_del(&pnetelem->list);
 176                         dev_put(pnetelem->ndev);
 177                         kfree(pnetelem);
 178                         rc = 0;
 179                         break;
 180                 }
 181         }
 182         write_unlock(&pnettable->lock);
 183         return rc;
 184 }
 185
 186 /* Append a pnetid to the end of the pnet table if not already on this list.
 187  */
 188 static int smc_pnet_enter(struct smc_pnettable *pnettable,
 189                           struct smc_user_pnetentry *new_pnetelem)
 190 {
 191         u8 pnet_null[SMC_MAX_PNETID_LEN] = {0};
 192         u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
 193         struct smc_pnetentry *tmp_pnetelem;
 194         struct smc_pnetentry *pnetelem;
 195         bool new_smcddev = false;
 196         struct net_device *ndev;
 197         bool new_netdev = true;
 198         bool new_ibdev = false;
 199
 200         if (new_pnetelem->smcibdev) {
 201                 struct smc_ib_device *ib_dev = new_pnetelem->smcibdev;
 202                 int ib_port = new_pnetelem->ib_port;
 203
 204                 spin_lock(&smc_ib_devices.lock);
 205                 if (smc_pnet_match(ib_dev->pnetid[ib_port - 1], pnet_null)) {
 206                         memcpy(ib_dev->pnetid[ib_port - 1],
 207                                new_pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
 208                         ib_dev->pnetid_by_user[ib_port - 1] = true;
 209                         new_ibdev = true;
 210                 }
 211                 spin_unlock(&smc_ib_devices.lock);
 212         }
 213         if (new_pnetelem->smcd_dev) {
 214                 struct smcd_dev *smcd_dev = new_pnetelem->smcd_dev;
 215
 216                 spin_lock(&smcd_dev_list.lock);
 217                 if (smc_pnet_match(smcd_dev->pnetid, pnet_null)) {
 218                         memcpy(smcd_dev->pnetid, new_pnetelem->pnet_name,
 219                                SMC_MAX_PNETID_LEN);
 220                         smcd_dev->pnetid_by_user = true;
 221                         new_smcddev = true;
 222                 }
 223                 spin_unlock(&smcd_dev_list.lock);
 224         }
 225
 226         if (!new_pnetelem->ndev)
 227                 return (new_ibdev || new_smcddev) ? 0 : -EEXIST;
 228
 229         /* check if (base) netdev already has a pnetid. If there is one, we do
 230          * not want to add a pnet table entry
 231          */
 232         ndev = pnet_find_base_ndev(new_pnetelem->ndev);
 233         if (!smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
 234                                     ndev_pnetid))
 235                 return (new_ibdev || new_smcddev) ? 0 : -EEXIST;
 236
 237         /* add a new netdev entry to the pnet table if there isn't one */
 238         tmp_pnetelem = kzalloc(sizeof(*pnetelem), GFP_KERNEL);
 239         if (!tmp_pnetelem)
 240                 return -ENOMEM;
 241         memcpy(tmp_pnetelem->pnet_name, new_pnetelem->pnet_name,
 242                SMC_MAX_PNETID_LEN);
 243         tmp_pnetelem->ndev = new_pnetelem->ndev;
 244
 245         write_lock(&pnettable->lock);
 246         list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
 247                 if (pnetelem->ndev == new_pnetelem->ndev)
 248                         new_netdev = false;
 249         }
 250         if (new_netdev) {
 251                 dev_hold(tmp_pnetelem->ndev);
 252                 list_add_tail(&tmp_pnetelem->list, &pnettable->pnetlist);
 253                 write_unlock(&pnettable->lock);
 254         } else {
 255                 write_unlock(&pnettable->lock);
 256                 kfree(tmp_pnetelem);
 257         }
 258
 259         return (new_netdev || new_ibdev || new_smcddev) ? 0 : -EEXIST;
 260 }
 261
 262 /* The limit for pnetid is 16 characters.
 263  * Valid characters should be (single-byte character set) a-z, A-Z, 0-9.
 264  * Lower case letters are converted to upper case.
 265  * Interior blanks should not be used.
 266  */
 267 static bool smc_pnetid_valid(const char *pnet_name, char *pnetid)
 268 {
 269         char *bf = skip_spaces(pnet_name);
 270         size_t len = strlen(bf);
 271         char *end = bf + len;
 272
 273         if (!len)
 274                 return false;
 275         while (--end >= bf && isspace(*end))
 276                 ;
 277         if (end - bf >= SMC_MAX_PNETID_LEN)
 278                 return false;
 279         while (bf <= end) {
 280                 if (!isalnum(*bf))
 281                         return false;
 282                 *pnetid++ = islower(*bf) ? toupper(*bf) : *bf;
 283                 bf++;
 284         }
 285         *pnetid = '\0';
 286         return true;
 287 }
 288
 289 /* Find an infiniband device by a given name. The device might not exist. */
 290 static struct smc_ib_device *smc_pnet_find_ib(char *ib_name)
 291 {
 292         struct smc_ib_device *ibdev;
 293
 294         spin_lock(&smc_ib_devices.lock);
 295         list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
 296                 if (!strncmp(ibdev->ibdev->name, ib_name,
 297                              sizeof(ibdev->ibdev->name)) ||
 298                     !strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
 299                              IB_DEVICE_NAME_MAX - 1)) {
 300                         goto out;
 301                 }
 302         }
 303         ibdev = NULL;
 304 out:
 305         spin_unlock(&smc_ib_devices.lock);
 306         return ibdev;
 307 }
 308
 309 /* Find an smcd device by a given name. The device might not exist. */
 310 static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
 311 {
 312         struct smcd_dev *smcd_dev;
 313
 314         spin_lock(&smcd_dev_list.lock);
 315         list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
 316                 if (!strncmp(dev_name(&smcd_dev->dev), smcd_name,
 317                              IB_DEVICE_NAME_MAX - 1))
 318                         goto out;
 319         }
 320         smcd_dev = NULL;
 321 out:
 322         spin_unlock(&smcd_dev_list.lock);
 323         return smcd_dev;
 324 }
 325
 326 /* Parse the supplied netlink attributes and fill a pnetentry structure.
 327  * For ethernet and infiniband device names verify that the devices exist.
 328  */
 329 static int smc_pnet_fill_entry(struct net *net,
 330                                struct smc_user_pnetentry *pnetelem,
 331                                struct nlattr *tb[])
 332 {
 333         char *string, *ibname;
 334         int rc;
 335
 336         memset(pnetelem, 0, sizeof(*pnetelem));
 337         INIT_LIST_HEAD(&pnetelem->list);
 338
 339         rc = -EINVAL;
 340         if (!tb[SMC_PNETID_NAME])
 341                 goto error;
 342         string = (char *)nla_data(tb[SMC_PNETID_NAME]);
 343         if (!smc_pnetid_valid(string, pnetelem->pnet_name))
 344                 goto error;
 345
 346         rc = -EINVAL;
 347         if (tb[SMC_PNETID_ETHNAME]) {
 348                 string = (char *)nla_data(tb[SMC_PNETID_ETHNAME]);
 349                 pnetelem->ndev = dev_get_by_name(net, string);
 350                 if (!pnetelem->ndev)
 351                         goto error;
 352         }
 353
 354         /* if this is not the initial namespace, stop here */
 355         if (net != &init_net)
 356                 return 0;
 357
 358         rc = -EINVAL;
 359         if (tb[SMC_PNETID_IBNAME]) {
 360                 ibname = (char *)nla_data(tb[SMC_PNETID_IBNAME]);
 361                 ibname = strim(ibname);
 362                 pnetelem->smcibdev = smc_pnet_find_ib(ibname);
 363                 pnetelem->smcd_dev = smc_pnet_find_smcd(ibname);
 364                 if (!pnetelem->smcibdev && !pnetelem->smcd_dev)
 365                         goto error;
 366                 if (pnetelem->smcibdev) {
 367                         if (!tb[SMC_PNETID_IBPORT])
 368                                 goto error;
 369                         pnetelem->ib_port = nla_get_u8(tb[SMC_PNETID_IBPORT]);
 370                         if (pnetelem->ib_port < 1 ||
 371                             pnetelem->ib_port > SMC_MAX_PORTS)
 372                                 goto error;
 373                 }
 374         }
 375
 376         return 0;
 377
 378 error:
 379         if (pnetelem->ndev)
 380                 dev_put(pnetelem->ndev);
 381         return rc;
 382 }
 383
 384 /* Convert an smc_pnetentry to a netlink attribute sequence */
 385 static int smc_pnet_set_nla(struct sk_buff *msg,
 386                             struct smc_user_pnetentry *pnetelem)
 387 {
 388         if (nla_put_string(msg, SMC_PNETID_NAME, pnetelem->pnet_name))
 389                 return -1;
 390         if (pnetelem->ndev) {
 391                 if (nla_put_string(msg, SMC_PNETID_ETHNAME,
 392                                    pnetelem->ndev->name))
 393                         return -1;
 394         } else {
 395                 if (nla_put_string(msg, SMC_PNETID_ETHNAME, "n/a"))
 396                         return -1;
 397         }
 398         if (pnetelem->smcibdev) {
 399                 if (nla_put_string(msg, SMC_PNETID_IBNAME,
 400                         dev_name(pnetelem->smcibdev->ibdev->dev.parent)) ||
 401                     nla_put_u8(msg, SMC_PNETID_IBPORT, pnetelem->ib_port))
 402                         return -1;
 403         } else if (pnetelem->smcd_dev) {
 404                 if (nla_put_string(msg, SMC_PNETID_IBNAME,
 405                                    dev_name(&pnetelem->smcd_dev->dev)) ||
 406                     nla_put_u8(msg, SMC_PNETID_IBPORT, 1))
 407                         return -1;
 408         } else {
 409                 if (nla_put_string(msg, SMC_PNETID_IBNAME, "n/a") ||
 410                     nla_put_u8(msg, SMC_PNETID_IBPORT, 0xff))
 411                         return -1;
 412         }
 413
 414         return 0;
 415 }
 416
 417 static int smc_pnet_add(struct sk_buff *skb, struct genl_info *info)
 418 {
 419         struct net *net = genl_info_net(info);
 420         struct smc_user_pnetentry pnetelem;
 421         struct smc_pnettable *pnettable;
 422         struct smc_net *sn;
 423         int rc;
 424
 425         /* get pnettable for namespace */
 426         sn = net_generic(net, smc_net_id);
 427         pnettable = &sn->pnettable;
 428
 429         rc = smc_pnet_fill_entry(net, &pnetelem, info->attrs);
 430         if (!rc)
 431                 rc = smc_pnet_enter(pnettable, &pnetelem);
 432         if (pnetelem.ndev)
 433                 dev_put(pnetelem.ndev);
 434         return rc;
 435 }
 436
 437 static int smc_pnet_del(struct sk_buff *skb, struct genl_info *info)
 438 {
 439         struct net *net = genl_info_net(info);
 440
 441         if (!info->attrs[SMC_PNETID_NAME])
 442                 return -EINVAL;
 443         return smc_pnet_remove_by_pnetid(net,
 444                                 (char *)nla_data(info->attrs[SMC_PNETID_NAME]));
 445 }
 446
 447 static int smc_pnet_dump_start(struct netlink_callback *cb)
 448 {
 449         cb->args[0] = 0;
 450         return 0;
 451 }
 452
 453 static int smc_pnet_dumpinfo(struct sk_buff *skb,
 454                              u32 portid, u32 seq, u32 flags,
 455                              struct smc_user_pnetentry *pnetelem)
 456 {
 457         void *hdr;
 458
 459         hdr = genlmsg_put(skb, portid, seq, &smc_pnet_nl_family,
 460                           flags, SMC_PNETID_GET);
 461         if (!hdr)
 462                 return -ENOMEM;
 463         if (smc_pnet_set_nla(skb, pnetelem) < 0) {
 464                 genlmsg_cancel(skb, hdr);
 465                 return -EMSGSIZE;
 466         }
 467         genlmsg_end(skb, hdr);
 468         return 0;
 469 }
 470
 471 static int _smc_pnet_dump(struct net *net, struct sk_buff *skb, u32 portid,
 472                           u32 seq, u8 *pnetid, int start_idx)
 473 {
 474         struct smc_user_pnetentry tmp_entry;
 475         struct smc_pnettable *pnettable;
 476         struct smc_pnetentry *pnetelem;
 477         struct smc_ib_device *ibdev;
 478         struct smcd_dev *smcd_dev;
 479         struct smc_net *sn;
 480         int idx = 0;
 481         int ibport;
 482
 483         /* get pnettable for namespace */
 484         sn = net_generic(net, smc_net_id);
 485         pnettable = &sn->pnettable;
 486
 487         /* dump netdevices */
 488         read_lock(&pnettable->lock);
 489         list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
 490                 if (pnetid && !smc_pnet_match(pnetelem->pnet_name, pnetid))
 491                         continue;
 492                 if (idx++ < start_idx)
 493                         continue;
 494                 memset(&tmp_entry, 0, sizeof(tmp_entry));
 495                 memcpy(&tmp_entry.pnet_name, pnetelem->pnet_name,
 496                        SMC_MAX_PNETID_LEN);
 497                 tmp_entry.ndev = pnetelem->ndev;
 498                 if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
 499                                       &tmp_entry)) {
 500                         --idx;
 501                         break;
 502                 }
 503         }
 504         read_unlock(&pnettable->lock);
 505
 506         /* if this is not the initial namespace, stop here */
 507         if (net != &init_net)
 508                 return idx;
 509
 510         /* dump ib devices */
 511         spin_lock(&smc_ib_devices.lock);
 512         list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
 513                 for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
 514                         if (ibdev->pnetid_by_user[ibport]) {
 515                                 if (pnetid &&
 516                                     !smc_pnet_match(ibdev->pnetid[ibport],
 517                                                     pnetid))
 518                                         continue;
 519                                 if (idx++ < start_idx)
 520                                         continue;
 521                                 memset(&tmp_entry, 0, sizeof(tmp_entry));
 522                                 memcpy(&tmp_entry.pnet_name,
 523                                        ibdev->pnetid[ibport],
 524                                        SMC_MAX_PNETID_LEN);
 525                                 tmp_entry.smcibdev = ibdev;
 526                                 tmp_entry.ib_port = ibport + 1;
 527                                 if (smc_pnet_dumpinfo(skb, portid, seq,
 528                                                       NLM_F_MULTI,
 529                                                       &tmp_entry)) {
 530                                         --idx;
 531                                         break;
 532                                 }
 533                         }
 534                 }
 535         }
 536         spin_unlock(&smc_ib_devices.lock);
 537
 538         /* dump smcd devices */
 539         spin_lock(&smcd_dev_list.lock);
 540         list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
 541                 if (smcd_dev->pnetid_by_user) {
 542                         if (pnetid && !smc_pnet_match(smcd_dev->pnetid, pnetid))
 543                                 continue;
 544                         if (idx++ < start_idx)
 545                                 continue;
 546                         memset(&tmp_entry, 0, sizeof(tmp_entry));
 547                         memcpy(&tmp_entry.pnet_name, smcd_dev->pnetid,
 548                                SMC_MAX_PNETID_LEN);
 549                         tmp_entry.smcd_dev = smcd_dev;
 550                         if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
 551                                               &tmp_entry)) {
 552                                 --idx;
 553                                 break;
 554                         }
 555                 }
 556         }
 557         spin_unlock(&smcd_dev_list.lock);
 558
 559         return idx;
 560 }
 561
 562 static int smc_pnet_dump(struct sk_buff *skb, struct netlink_callback *cb)
 563 {
 564         struct net *net = sock_net(skb->sk);
 565         int idx;
 566
 567         idx = _smc_pnet_dump(net, skb, NETLINK_CB(cb->skb).portid,
 568                              cb->nlh->nlmsg_seq, NULL, cb->args[0]);
 569
 570         cb->args[0] = idx;
 571         return skb->len;
 572 }
 573
 574 /* Retrieve one PNETID entry */
 575 static int smc_pnet_get(struct sk_buff *skb, struct genl_info *info)
 576 {
 577         struct net *net = genl_info_net(info);
 578         struct sk_buff *msg;
 579         void *hdr;
 580
 581         if (!info->attrs[SMC_PNETID_NAME])
 582                 return -EINVAL;
 583
 584         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 585         if (!msg)
 586                 return -ENOMEM;
 587
 588         _smc_pnet_dump(net, msg, info->snd_portid, info->snd_seq,
 589                        nla_data(info->attrs[SMC_PNETID_NAME]), 0);
 590
 591         /* finish multi part message and send it */
 592         hdr = nlmsg_put(msg, info->snd_portid, info->snd_seq, NLMSG_DONE, 0,
 593                         NLM_F_MULTI);
 594         if (!hdr) {
 595                 nlmsg_free(msg);
 596                 return -EMSGSIZE;
 597         }
 598         return genlmsg_reply(msg, info);
 599 }
 600
 601 /* Remove and delete all pnetids from pnet table.
 602  */
 603 static int smc_pnet_flush(struct sk_buff *skb, struct genl_info *info)
 604 {
 605         struct net *net = genl_info_net(info);
 606
 607         smc_pnet_remove_by_pnetid(net, NULL);
 608         return 0;
 609 }
 610
 611 /* SMC_PNETID generic netlink operation definition */
 612 static const struct genl_ops smc_pnet_ops[] = {
 613         {
 614                 .cmd = SMC_PNETID_GET,
 615                 .flags = GENL_ADMIN_PERM,
 616                 .doit = smc_pnet_get,
 617                 .dumpit = smc_pnet_dump,
 618                 .start = smc_pnet_dump_start
 619         },
 620         {
 621                 .cmd = SMC_PNETID_ADD,
 622                 .flags = GENL_ADMIN_PERM,
 623                 .doit = smc_pnet_add
 624         },
 625         {
 626                 .cmd = SMC_PNETID_DEL,
 627                 .flags = GENL_ADMIN_PERM,
 628                 .doit = smc_pnet_del
 629         },
 630         {
 631                 .cmd = SMC_PNETID_FLUSH,
 632                 .flags = GENL_ADMIN_PERM,
 633                 .doit = smc_pnet_flush
 634         }
 635 };
 636
 637 /* SMC_PNETID family definition */
 638 static struct genl_family smc_pnet_nl_family __ro_after_init = {
 639         .hdrsize = 0,
 640         .name = SMCR_GENL_FAMILY_NAME,
 641         .version = SMCR_GENL_FAMILY_VERSION,
 642         .maxattr = SMC_PNETID_MAX,
 643         .policy = smc_pnet_policy,
 644         .netnsok = true,
 645         .module = THIS_MODULE,
 646         .ops = smc_pnet_ops,
 647         .n_ops =  ARRAY_SIZE(smc_pnet_ops)
 648 };
 649
 650 static int smc_pnet_netdev_event(struct notifier_block *this,
 651                                  unsigned long event, void *ptr)
 652 {
 653         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
 654
 655         switch (event) {
 656         case NETDEV_REBOOT:
 657         case NETDEV_UNREGISTER:
 658                 smc_pnet_remove_by_ndev(event_dev);
 659                 return NOTIFY_OK;
 660         default:
 661                 return NOTIFY_DONE;
 662         }
 663 }
 664
 665 static struct notifier_block smc_netdev_notifier = {
 666         .notifier_call = smc_pnet_netdev_event
 667 };
 668
 669 /* init network namespace */
 670 int smc_pnet_net_init(struct net *net)
 671 {
 672         struct smc_net *sn = net_generic(net, smc_net_id);
 673         struct smc_pnettable *pnettable = &sn->pnettable;
 674
 675         INIT_LIST_HEAD(&pnettable->pnetlist);
 676         rwlock_init(&pnettable->lock);
 677
 678         return 0;
 679 }
 680
 681 int __init smc_pnet_init(void)
 682 {
 683         int rc;
 684
 685         rc = genl_register_family(&smc_pnet_nl_family);
 686         if (rc)
 687                 return rc;
 688         rc = register_netdevice_notifier(&smc_netdev_notifier);
 689         if (rc)
 690                 genl_unregister_family(&smc_pnet_nl_family);
 691         return rc;
 692 }
 693
 694 /* exit network namespace */
 695 void smc_pnet_net_exit(struct net *net)
 696 {
 697         /* flush pnet table */
 698         smc_pnet_remove_by_pnetid(net, NULL);
 699 }
 700
 701 void smc_pnet_exit(void)
 702 {
 703         unregister_netdevice_notifier(&smc_netdev_notifier);
 704         genl_unregister_family(&smc_pnet_nl_family);
 705 }
 706
 707 /* Determine one base device for stacked net devices.
 708  * If the lower device level contains more than one devices
 709  * (for instance with bonding slaves), just the first device
 710  * is used to reach a base device.
 711  */
 712 static struct net_device *pnet_find_base_ndev(struct net_device *ndev)
 713 {
 714         int i, nest_lvl;
 715
 716         rtnl_lock();
 717         nest_lvl = dev_get_nest_level(ndev);
 718         for (i = 0; i < nest_lvl; i++) {
 719                 struct list_head *lower = &ndev->adj_list.lower;
 720
 721                 if (list_empty(lower))
 722                         break;
 723                 lower = lower->next;
 724                 ndev = netdev_lower_get_next(ndev, &lower);
 725         }
 726         rtnl_unlock();
 727         return ndev;
 728 }
 729
 730 static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
 731                                               u8 *pnetid)
 732 {
 733         struct smc_pnettable *pnettable;
 734         struct net *net = dev_net(ndev);
 735         struct smc_pnetentry *pnetelem;
 736         struct smc_net *sn;
 737         int rc = -ENOENT;
 738
 739         /* get pnettable for namespace */
 740         sn = net_generic(net, smc_net_id);
 741         pnettable = &sn->pnettable;
 742
 743         read_lock(&pnettable->lock);
 744         list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
 745                 if (ndev == pnetelem->ndev) {
 746                         /* get pnetid of netdev device */
 747                         memcpy(pnetid, pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
 748                         rc = 0;
 749                         break;
 750                 }
 751         }
 752         read_unlock(&pnettable->lock);
 753         return rc;
 754 }
 755
 756 /* if handshake network device belongs to a roce device, return its
 757  * IB device and port
 758  */
 759 static void smc_pnet_find_rdma_dev(struct net_device *netdev,
 760                                    struct smc_init_info *ini)
 761 {
 762         struct smc_ib_device *ibdev;
 763
 764         spin_lock(&smc_ib_devices.lock);
 765         list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
 766                 struct net_device *ndev;
 767                 int i;
 768
 769                 for (i = 1; i <= SMC_MAX_PORTS; i++) {
 770                         if (!rdma_is_port_valid(ibdev->ibdev, i))
 771                                 continue;
 772                         if (!ibdev->ibdev->ops.get_netdev)
 773                                 continue;
 774                         ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
 775                         if (!ndev)
 776                                 continue;
 777                         dev_put(ndev);
 778                         if (netdev == ndev &&
 779                             smc_ib_port_active(ibdev, i) &&
 780                             !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
 781                                                   ini->ib_gid, NULL)) {
 782                                 ini->ib_dev = ibdev;
 783                                 ini->ib_port = i;
 784                                 break;
 785                         }
 786                 }
 787         }
 788         spin_unlock(&smc_ib_devices.lock);
 789 }
 790
 791 /* Determine the corresponding IB device port based on the hardware PNETID.
 792  * Searching stops at the first matching active IB device port with vlan_id
 793  * configured.
 794  * If nothing found, check pnetid table.
 795  * If nothing found, try to use handshake device
 796  */
 797 static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
 798                                          struct smc_init_info *ini)
 799 {
 800         u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
 801         struct smc_ib_device *ibdev;
 802         int i;
 803
 804         ndev = pnet_find_base_ndev(ndev);
 805         if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
 806                                    ndev_pnetid) &&
 807             smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid)) {
 808                 smc_pnet_find_rdma_dev(ndev, ini);
 809                 return; /* pnetid could not be determined */
 810         }
 811
 812         spin_lock(&smc_ib_devices.lock);
 813         list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
 814                 for (i = 1; i <= SMC_MAX_PORTS; i++) {
 815                         if (!rdma_is_port_valid(ibdev->ibdev, i))
 816                                 continue;
 817                         if (smc_pnet_match(ibdev->pnetid[i - 1], ndev_pnetid) &&
 818                             smc_ib_port_active(ibdev, i) &&
 819                             !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
 820                                                   ini->ib_gid, NULL)) {
 821                                 ini->ib_dev = ibdev;
 822                                 ini->ib_port = i;
 823                                 goto out;
 824                         }
 825                 }
 826         }
 827 out:
 828         spin_unlock(&smc_ib_devices.lock);
 829 }
 830
 831 static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
 832                                         struct smc_init_info *ini)
 833 {
 834         u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
 835         struct smcd_dev *ismdev;
 836
 837         ndev = pnet_find_base_ndev(ndev);
 838         if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
 839                                    ndev_pnetid) &&
 840             smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid))
 841                 return; /* pnetid could not be determined */
 842
 843         spin_lock(&smcd_dev_list.lock);
 844         list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
 845                 if (smc_pnet_match(ismdev->pnetid, ndev_pnetid)) {
 846                         ini->ism_dev = ismdev;
 847                         break;
 848                 }
 849         }
 850         spin_unlock(&smcd_dev_list.lock);
 851 }
 852
 853 /* PNET table analysis for a given sock:
 854  * determine ib_device and port belonging to used internal TCP socket
 855  * ethernet interface.
 856  */
 857 void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini)
 858 {
 859         struct dst_entry *dst = sk_dst_get(sk);
 860
 861         ini->ib_dev = NULL;
 862         ini->ib_port = 0;
 863         if (!dst)
 864                 goto out;
 865         if (!dst->dev)
 866                 goto out_rel;
 867
 868         smc_pnet_find_roce_by_pnetid(dst->dev, ini);
 869
 870 out_rel:
 871         dst_release(dst);
 872 out:
 873         return;
 874 }
 875
 876 void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini)
 877 {
 878         struct dst_entry *dst = sk_dst_get(sk);
 879
 880         ini->ism_dev = NULL;
 881         if (!dst)
 882                 goto out;
 883         if (!dst->dev)
 884                 goto out_rel;
 885
 886         smc_pnet_find_ism_by_pnetid(dst->dev, ini);
 887
 888 out_rel:
 889         dst_release(dst);
 890 out:
 891         return;
 892 }