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                     (ibdev->ibdev->dev.parent &&
 299                      !strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
 300                              IB_DEVICE_NAME_MAX - 1))) {
 301                         goto out;
 302                 }
 303         }
 304         ibdev = NULL;
 305 out:
 306         spin_unlock(&smc_ib_devices.lock);
 307         return ibdev;
 308 }
 309
 310 /* Find an smcd device by a given name. The device might not exist. */
 311 static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
 312 {
 313         struct smcd_dev *smcd_dev;
 314
 315         spin_lock(&smcd_dev_list.lock);
 316         list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
 317                 if (!strncmp(dev_name(&smcd_dev->dev), smcd_name,
 318                              IB_DEVICE_NAME_MAX - 1))
 319                         goto out;
 320         }
 321         smcd_dev = NULL;
 322 out:
 323         spin_unlock(&smcd_dev_list.lock);
 324         return smcd_dev;
 325 }
 326
 327 /* Parse the supplied netlink attributes and fill a pnetentry structure.
 328  * For ethernet and infiniband device names verify that the devices exist.
 329  */
 330 static int smc_pnet_fill_entry(struct net *net,
 331                                struct smc_user_pnetentry *pnetelem,
 332                                struct nlattr *tb[])
 333 {
 334         char *string, *ibname;
 335         int rc;
 336
 337         memset(pnetelem, 0, sizeof(*pnetelem));
 338         INIT_LIST_HEAD(&pnetelem->list);
 339
 340         rc = -EINVAL;
 341         if (!tb[SMC_PNETID_NAME])
 342                 goto error;
 343         string = (char *)nla_data(tb[SMC_PNETID_NAME]);
 344         if (!smc_pnetid_valid(string, pnetelem->pnet_name))
 345                 goto error;
 346
 347         rc = -EINVAL;
 348         if (tb[SMC_PNETID_ETHNAME]) {
 349                 string = (char *)nla_data(tb[SMC_PNETID_ETHNAME]);
 350                 pnetelem->ndev = dev_get_by_name(net, string);
 351                 if (!pnetelem->ndev)
 352                         goto error;
 353         }
 354
 355         /* if this is not the initial namespace, stop here */
 356         if (net != &init_net)
 357                 return 0;
 358
 359         rc = -EINVAL;
 360         if (tb[SMC_PNETID_IBNAME]) {
 361                 ibname = (char *)nla_data(tb[SMC_PNETID_IBNAME]);
 362                 ibname = strim(ibname);
 363                 pnetelem->smcibdev = smc_pnet_find_ib(ibname);
 364                 pnetelem->smcd_dev = smc_pnet_find_smcd(ibname);
 365                 if (!pnetelem->smcibdev && !pnetelem->smcd_dev)
 366                         goto error;
 367                 if (pnetelem->smcibdev) {
 368                         if (!tb[SMC_PNETID_IBPORT])
 369                                 goto error;
 370                         pnetelem->ib_port = nla_get_u8(tb[SMC_PNETID_IBPORT]);
 371                         if (pnetelem->ib_port < 1 ||
 372                             pnetelem->ib_port > SMC_MAX_PORTS)
 373                                 goto error;
 374                 }
 375         }
 376
 377         return 0;
 378
 379 error:
 380         return rc;
 381 }
 382
 383 /* Convert an smc_pnetentry to a netlink attribute sequence */
 384 static int smc_pnet_set_nla(struct sk_buff *msg,
 385                             struct smc_user_pnetentry *pnetelem)
 386 {
 387         if (nla_put_string(msg, SMC_PNETID_NAME, pnetelem->pnet_name))
 388                 return -1;
 389         if (pnetelem->ndev) {
 390                 if (nla_put_string(msg, SMC_PNETID_ETHNAME,
 391                                    pnetelem->ndev->name))
 392                         return -1;
 393         } else {
 394                 if (nla_put_string(msg, SMC_PNETID_ETHNAME, "n/a"))
 395                         return -1;
 396         }
 397         if (pnetelem->smcibdev) {
 398                 if (nla_put_string(msg, SMC_PNETID_IBNAME,
 399                         dev_name(pnetelem->smcibdev->ibdev->dev.parent)) ||
 400                     nla_put_u8(msg, SMC_PNETID_IBPORT, pnetelem->ib_port))
 401                         return -1;
 402         } else if (pnetelem->smcd_dev) {
 403                 if (nla_put_string(msg, SMC_PNETID_IBNAME,
 404                                    dev_name(&pnetelem->smcd_dev->dev)) ||
 405                     nla_put_u8(msg, SMC_PNETID_IBPORT, 1))
 406                         return -1;
 407         } else {
 408                 if (nla_put_string(msg, SMC_PNETID_IBNAME, "n/a") ||
 409                     nla_put_u8(msg, SMC_PNETID_IBPORT, 0xff))
 410                         return -1;
 411         }
 412
 413         return 0;
 414 }
 415
 416 static int smc_pnet_add(struct sk_buff *skb, struct genl_info *info)
 417 {
 418         struct net *net = genl_info_net(info);
 419         struct smc_user_pnetentry pnetelem;
 420         struct smc_pnettable *pnettable;
 421         struct smc_net *sn;
 422         int rc;
 423
 424         /* get pnettable for namespace */
 425         sn = net_generic(net, smc_net_id);
 426         pnettable = &sn->pnettable;
 427
 428         rc = smc_pnet_fill_entry(net, &pnetelem, info->attrs);
 429         if (!rc)
 430                 rc = smc_pnet_enter(pnettable, &pnetelem);
 431         if (pnetelem.ndev)
 432                 dev_put(pnetelem.ndev);
 433         return rc;
 434 }
 435
 436 static int smc_pnet_del(struct sk_buff *skb, struct genl_info *info)
 437 {
 438         struct net *net = genl_info_net(info);
 439
 440         if (!info->attrs[SMC_PNETID_NAME])
 441                 return -EINVAL;
 442         return smc_pnet_remove_by_pnetid(net,
 443                                 (char *)nla_data(info->attrs[SMC_PNETID_NAME]));
 444 }
 445
 446 static int smc_pnet_dump_start(struct netlink_callback *cb)
 447 {
 448         cb->args[0] = 0;
 449         return 0;
 450 }
 451
 452 static int smc_pnet_dumpinfo(struct sk_buff *skb,
 453                              u32 portid, u32 seq, u32 flags,
 454                              struct smc_user_pnetentry *pnetelem)
 455 {
 456         void *hdr;
 457
 458         hdr = genlmsg_put(skb, portid, seq, &smc_pnet_nl_family,
 459                           flags, SMC_PNETID_GET);
 460         if (!hdr)
 461                 return -ENOMEM;
 462         if (smc_pnet_set_nla(skb, pnetelem) < 0) {
 463                 genlmsg_cancel(skb, hdr);
 464                 return -EMSGSIZE;
 465         }
 466         genlmsg_end(skb, hdr);
 467         return 0;
 468 }
 469
 470 static int _smc_pnet_dump(struct net *net, struct sk_buff *skb, u32 portid,
 471                           u32 seq, u8 *pnetid, int start_idx)
 472 {
 473         struct smc_user_pnetentry tmp_entry;
 474         struct smc_pnettable *pnettable;
 475         struct smc_pnetentry *pnetelem;
 476         struct smc_ib_device *ibdev;
 477         struct smcd_dev *smcd_dev;
 478         struct smc_net *sn;
 479         int idx = 0;
 480         int ibport;
 481
 482         /* get pnettable for namespace */
 483         sn = net_generic(net, smc_net_id);
 484         pnettable = &sn->pnettable;
 485
 486         /* dump netdevices */
 487         read_lock(&pnettable->lock);
 488         list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
 489                 if (pnetid && !smc_pnet_match(pnetelem->pnet_name, pnetid))
 490                         continue;
 491                 if (idx++ < start_idx)
 492                         continue;
 493                 memset(&tmp_entry, 0, sizeof(tmp_entry));
 494                 memcpy(&tmp_entry.pnet_name, pnetelem->pnet_name,
 495                        SMC_MAX_PNETID_LEN);
 496                 tmp_entry.ndev = pnetelem->ndev;
 497                 if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
 498                                       &tmp_entry)) {
 499                         --idx;
 500                         break;
 501                 }
 502         }
 503         read_unlock(&pnettable->lock);
 504
 505         /* if this is not the initial namespace, stop here */
 506         if (net != &init_net)
 507                 return idx;
 508
 509         /* dump ib devices */
 510         spin_lock(&smc_ib_devices.lock);
 511         list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
 512                 for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
 513                         if (ibdev->pnetid_by_user[ibport]) {
 514                                 if (pnetid &&
 515                                     !smc_pnet_match(ibdev->pnetid[ibport],
 516                                                     pnetid))
 517                                         continue;
 518                                 if (idx++ < start_idx)
 519                                         continue;
 520                                 memset(&tmp_entry, 0, sizeof(tmp_entry));
 521                                 memcpy(&tmp_entry.pnet_name,
 522                                        ibdev->pnetid[ibport],
 523                                        SMC_MAX_PNETID_LEN);
 524                                 tmp_entry.smcibdev = ibdev;
 525                                 tmp_entry.ib_port = ibport + 1;
 526                                 if (smc_pnet_dumpinfo(skb, portid, seq,
 527                                                       NLM_F_MULTI,
 528                                                       &tmp_entry)) {
 529                                         --idx;
 530                                         break;
 531                                 }
 532                         }
 533                 }
 534         }
 535         spin_unlock(&smc_ib_devices.lock);
 536
 537         /* dump smcd devices */
 538         spin_lock(&smcd_dev_list.lock);
 539         list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
 540                 if (smcd_dev->pnetid_by_user) {
 541                         if (pnetid && !smc_pnet_match(smcd_dev->pnetid, pnetid))
 542                                 continue;
 543                         if (idx++ < start_idx)
 544                                 continue;
 545                         memset(&tmp_entry, 0, sizeof(tmp_entry));
 546                         memcpy(&tmp_entry.pnet_name, smcd_dev->pnetid,
 547                                SMC_MAX_PNETID_LEN);
 548                         tmp_entry.smcd_dev = smcd_dev;
 549                         if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
 550                                               &tmp_entry)) {
 551                                 --idx;
 552                                 break;
 553                         }
 554                 }
 555         }
 556         spin_unlock(&smcd_dev_list.lock);
 557
 558         return idx;
 559 }
 560
 561 static int smc_pnet_dump(struct sk_buff *skb, struct netlink_callback *cb)
 562 {
 563         struct net *net = sock_net(skb->sk);
 564         int idx;
 565
 566         idx = _smc_pnet_dump(net, skb, NETLINK_CB(cb->skb).portid,
 567                              cb->nlh->nlmsg_seq, NULL, cb->args[0]);
 568
 569         cb->args[0] = idx;
 570         return skb->len;
 571 }
 572
 573 /* Retrieve one PNETID entry */
 574 static int smc_pnet_get(struct sk_buff *skb, struct genl_info *info)
 575 {
 576         struct net *net = genl_info_net(info);
 577         struct sk_buff *msg;
 578         void *hdr;
 579
 580         if (!info->attrs[SMC_PNETID_NAME])
 581                 return -EINVAL;
 582
 583         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 584         if (!msg)
 585                 return -ENOMEM;
 586
 587         _smc_pnet_dump(net, msg, info->snd_portid, info->snd_seq,
 588                        nla_data(info->attrs[SMC_PNETID_NAME]), 0);
 589
 590         /* finish multi part message and send it */
 591         hdr = nlmsg_put(msg, info->snd_portid, info->snd_seq, NLMSG_DONE, 0,
 592                         NLM_F_MULTI);
 593         if (!hdr) {
 594                 nlmsg_free(msg);
 595                 return -EMSGSIZE;
 596         }
 597         return genlmsg_reply(msg, info);
 598 }
 599
 600 /* Remove and delete all pnetids from pnet table.
 601  */
 602 static int smc_pnet_flush(struct sk_buff *skb, struct genl_info *info)
 603 {
 604         struct net *net = genl_info_net(info);
 605
 606         smc_pnet_remove_by_pnetid(net, NULL);
 607         return 0;
 608 }
 609
 610 /* SMC_PNETID generic netlink operation definition */
 611 static const struct genl_ops smc_pnet_ops[] = {
 612         {
 613                 .cmd = SMC_PNETID_GET,
 614                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 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                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 623                 .flags = GENL_ADMIN_PERM,
 624                 .doit = smc_pnet_add
 625         },
 626         {
 627                 .cmd = SMC_PNETID_DEL,
 628                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 629                 .flags = GENL_ADMIN_PERM,
 630                 .doit = smc_pnet_del
 631         },
 632         {
 633                 .cmd = SMC_PNETID_FLUSH,
 634                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 635                 .flags = GENL_ADMIN_PERM,
 636                 .doit = smc_pnet_flush
 637         }
 638 };
 639
 640 /* SMC_PNETID family definition */
 641 static struct genl_family smc_pnet_nl_family __ro_after_init = {
 642         .hdrsize = 0,
 643         .name = SMCR_GENL_FAMILY_NAME,
 644         .version = SMCR_GENL_FAMILY_VERSION,
 645         .maxattr = SMC_PNETID_MAX,
 646         .policy = smc_pnet_policy,
 647         .netnsok = true,
 648         .module = THIS_MODULE,
 649         .ops = smc_pnet_ops,
 650         .n_ops =  ARRAY_SIZE(smc_pnet_ops)
 651 };
 652
 653 static int smc_pnet_netdev_event(struct notifier_block *this,
 654                                  unsigned long event, void *ptr)
 655 {
 656         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
 657
 658         switch (event) {
 659         case NETDEV_REBOOT:
 660         case NETDEV_UNREGISTER:
 661                 smc_pnet_remove_by_ndev(event_dev);
 662                 return NOTIFY_OK;
 663         default:
 664                 return NOTIFY_DONE;
 665         }
 666 }
 667
 668 static struct notifier_block smc_netdev_notifier = {
 669         .notifier_call = smc_pnet_netdev_event
 670 };
 671
 672 /* init network namespace */
 673 int smc_pnet_net_init(struct net *net)
 674 {
 675         struct smc_net *sn = net_generic(net, smc_net_id);
 676         struct smc_pnettable *pnettable = &sn->pnettable;
 677
 678         INIT_LIST_HEAD(&pnettable->pnetlist);
 679         rwlock_init(&pnettable->lock);
 680
 681         return 0;
 682 }
 683
 684 int __init smc_pnet_init(void)
 685 {
 686         int rc;
 687
 688         rc = genl_register_family(&smc_pnet_nl_family);
 689         if (rc)
 690                 return rc;
 691         rc = register_netdevice_notifier(&smc_netdev_notifier);
 692         if (rc)
 693                 genl_unregister_family(&smc_pnet_nl_family);
 694         return rc;
 695 }
 696
 697 /* exit network namespace */
 698 void smc_pnet_net_exit(struct net *net)
 699 {
 700         /* flush pnet table */
 701         smc_pnet_remove_by_pnetid(net, NULL);
 702 }
 703
 704 void smc_pnet_exit(void)
 705 {
 706         unregister_netdevice_notifier(&smc_netdev_notifier);
 707         genl_unregister_family(&smc_pnet_nl_family);
 708 }
 709
 710 /* Determine one base device for stacked net devices.
 711  * If the lower device level contains more than one devices
 712  * (for instance with bonding slaves), just the first device
 713  * is used to reach a base device.
 714  */
 715 static struct net_device *pnet_find_base_ndev(struct net_device *ndev)
 716 {
 717         int i, nest_lvl;
 718
 719         rtnl_lock();
 720         nest_lvl = ndev->lower_level;
 721         for (i = 0; i < nest_lvl; i++) {
 722                 struct list_head *lower = &ndev->adj_list.lower;
 723
 724                 if (list_empty(lower))
 725                         break;
 726                 lower = lower->next;
 727                 ndev = netdev_lower_get_next(ndev, &lower);
 728         }
 729         rtnl_unlock();
 730         return ndev;
 731 }
 732
 733 static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
 734                                               u8 *pnetid)
 735 {
 736         struct smc_pnettable *pnettable;
 737         struct net *net = dev_net(ndev);
 738         struct smc_pnetentry *pnetelem;
 739         struct smc_net *sn;
 740         int rc = -ENOENT;
 741
 742         /* get pnettable for namespace */
 743         sn = net_generic(net, smc_net_id);
 744         pnettable = &sn->pnettable;
 745
 746         read_lock(&pnettable->lock);
 747         list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
 748                 if (ndev == pnetelem->ndev) {
 749                         /* get pnetid of netdev device */
 750                         memcpy(pnetid, pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
 751                         rc = 0;
 752                         break;
 753                 }
 754         }
 755         read_unlock(&pnettable->lock);
 756         return rc;
 757 }
 758
 759 /* if handshake network device belongs to a roce device, return its
 760  * IB device and port
 761  */
 762 static void smc_pnet_find_rdma_dev(struct net_device *netdev,
 763                                    struct smc_init_info *ini)
 764 {
 765         struct smc_ib_device *ibdev;
 766
 767         spin_lock(&smc_ib_devices.lock);
 768         list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
 769                 struct net_device *ndev;
 770                 int i;
 771
 772                 for (i = 1; i <= SMC_MAX_PORTS; i++) {
 773                         if (!rdma_is_port_valid(ibdev->ibdev, i))
 774                                 continue;
 775                         if (!ibdev->ibdev->ops.get_netdev)
 776                                 continue;
 777                         ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
 778                         if (!ndev)
 779                                 continue;
 780                         dev_put(ndev);
 781                         if (netdev == ndev &&
 782                             smc_ib_port_active(ibdev, i) &&
 783                             !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
 784                                                   ini->ib_gid, NULL)) {
 785                                 ini->ib_dev = ibdev;
 786                                 ini->ib_port = i;
 787                                 break;
 788                         }
 789                 }
 790         }
 791         spin_unlock(&smc_ib_devices.lock);
 792 }
 793
 794 /* Determine the corresponding IB device port based on the hardware PNETID.
 795  * Searching stops at the first matching active IB device port with vlan_id
 796  * configured.
 797  * If nothing found, check pnetid table.
 798  * If nothing found, try to use handshake device
 799  */
 800 static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
 801                                          struct smc_init_info *ini)
 802 {
 803         u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
 804         struct smc_ib_device *ibdev;
 805         int i;
 806
 807         ndev = pnet_find_base_ndev(ndev);
 808         if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
 809                                    ndev_pnetid) &&
 810             smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid)) {
 811                 smc_pnet_find_rdma_dev(ndev, ini);
 812                 return; /* pnetid could not be determined */
 813         }
 814
 815         spin_lock(&smc_ib_devices.lock);
 816         list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
 817                 for (i = 1; i <= SMC_MAX_PORTS; i++) {
 818                         if (!rdma_is_port_valid(ibdev->ibdev, i))
 819                                 continue;
 820                         if (smc_pnet_match(ibdev->pnetid[i - 1], ndev_pnetid) &&
 821                             smc_ib_port_active(ibdev, i) &&
 822                             !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
 823                                                   ini->ib_gid, NULL)) {
 824                                 ini->ib_dev = ibdev;
 825                                 ini->ib_port = i;
 826                                 goto out;
 827                         }
 828                 }
 829         }
 830 out:
 831         spin_unlock(&smc_ib_devices.lock);
 832 }
 833
 834 static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
 835                                         struct smc_init_info *ini)
 836 {
 837         u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
 838         struct smcd_dev *ismdev;
 839
 840         ndev = pnet_find_base_ndev(ndev);
 841         if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
 842                                    ndev_pnetid) &&
 843             smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid))
 844                 return; /* pnetid could not be determined */
 845
 846         spin_lock(&smcd_dev_list.lock);
 847         list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
 848                 if (smc_pnet_match(ismdev->pnetid, ndev_pnetid)) {
 849                         ini->ism_dev = ismdev;
 850                         break;
 851                 }
 852         }
 853         spin_unlock(&smcd_dev_list.lock);
 854 }
 855
 856 /* PNET table analysis for a given sock:
 857  * determine ib_device and port belonging to used internal TCP socket
 858  * ethernet interface.
 859  */
 860 void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini)
 861 {
 862         struct dst_entry *dst = sk_dst_get(sk);
 863
 864         ini->ib_dev = NULL;
 865         ini->ib_port = 0;
 866         if (!dst)
 867                 goto out;
 868         if (!dst->dev)
 869                 goto out_rel;
 870
 871         smc_pnet_find_roce_by_pnetid(dst->dev, ini);
 872
 873 out_rel:
 874         dst_release(dst);
 875 out:
 876         return;
 877 }
 878
 879 void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini)
 880 {
 881         struct dst_entry *dst = sk_dst_get(sk);
 882
 883         ini->ism_dev = NULL;
 884         if (!dst)
 885                 goto out;
 886         if (!dst->dev)
 887                 goto out_rel;
 888
 889         smc_pnet_find_ism_by_pnetid(dst->dev, ini);
 890
 891 out_rel:
 892         dst_release(dst);
 893 out:
 894         return;
 895 }