The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/ofed/drivers/infiniband/core/ib_cache.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
    3  *
    4  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
    5  * Copyright (c) 2005 Intel Corporation. All rights reserved.
    6  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
    7  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
    8  *
    9  * This software is available to you under a choice of one of two
   10  * licenses.  You may choose to be licensed under the terms of the GNU
   11  * General Public License (GPL) Version 2, available from the file
   12  * COPYING in the main directory of this source tree, or the
   13  * OpenIB.org BSD license below:
   14  *
   15  *     Redistribution and use in source and binary forms, with or
   16  *     without modification, are permitted provided that the following
   17  *     conditions are met:
   18  *
   19  *      - Redistributions of source code must retain the above
   20  *        copyright notice, this list of conditions and the following
   21  *        disclaimer.
   22  *
   23  *      - Redistributions in binary form must reproduce the above
   24  *        copyright notice, this list of conditions and the following
   25  *        disclaimer in the documentation and/or other materials
   26  *        provided with the distribution.
   27  *
   28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   32  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   33  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   34  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   35  * SOFTWARE.
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include <linux/module.h>
   42 #include <linux/errno.h>
   43 #include <linux/slab.h>
   44 #include <linux/workqueue.h>
   45 #include <linux/netdevice.h>
   46 #include <linux/in6.h>
   47 
   48 #include <rdma/ib_addr.h>
   49 #include <rdma/ib_cache.h>
   50 
   51 #include "core_priv.h"
   52 
   53 struct ib_pkey_cache {
   54         int             table_len;
   55         u16             table[0];
   56 };
   57 
   58 struct ib_update_work {
   59         struct work_struct work;
   60         struct ib_device  *device;
   61         u8                 port_num;
   62 };
   63 
   64 union ib_gid zgid;
   65 EXPORT_SYMBOL(zgid);
   66 
   67 static const struct ib_gid_attr zattr;
   68 
   69 enum gid_attr_find_mask {
   70         GID_ATTR_FIND_MASK_GID          = 1UL << 0,
   71         GID_ATTR_FIND_MASK_NETDEV       = 1UL << 1,
   72         GID_ATTR_FIND_MASK_DEFAULT      = 1UL << 2,
   73         GID_ATTR_FIND_MASK_GID_TYPE     = 1UL << 3,
   74 };
   75 
   76 enum gid_table_entry_props {
   77         GID_TABLE_ENTRY_INVALID         = 1UL << 0,
   78         GID_TABLE_ENTRY_DEFAULT         = 1UL << 1,
   79 };
   80 
   81 enum gid_table_write_action {
   82         GID_TABLE_WRITE_ACTION_ADD,
   83         GID_TABLE_WRITE_ACTION_DEL,
   84         /* MODIFY only updates the GID table. Currently only used by
   85          * ib_cache_update.
   86          */
   87         GID_TABLE_WRITE_ACTION_MODIFY
   88 };
   89 
   90 struct ib_gid_table_entry {
   91         unsigned long       props;
   92         union ib_gid        gid;
   93         struct ib_gid_attr  attr;
   94         void               *context;
   95 };
   96 
   97 struct ib_gid_table {
   98         int                  sz;
   99         /* In RoCE, adding a GID to the table requires:
  100          * (a) Find if this GID is already exists.
  101          * (b) Find a free space.
  102          * (c) Write the new GID
  103          *
  104          * Delete requires different set of operations:
  105          * (a) Find the GID
  106          * (b) Delete it.
  107          *
  108          * Add/delete should be carried out atomically.
  109          * This is done by locking this mutex from multiple
  110          * writers. We don't need this lock for IB, as the MAD
  111          * layer replaces all entries. All data_vec entries
  112          * are locked by this lock.
  113          **/
  114         struct mutex         lock;
  115         /* This lock protects the table entries from being
  116          * read and written simultaneously.
  117          */
  118         rwlock_t             rwlock;
  119         struct ib_gid_table_entry *data_vec;
  120 };
  121 
  122 static void dispatch_gid_change_event(struct ib_device *ib_dev, u8 port)
  123 {
  124         if (rdma_cap_roce_gid_table(ib_dev, port)) {
  125                 struct ib_event event;
  126 
  127                 event.device            = ib_dev;
  128                 event.element.port_num  = port;
  129                 event.event             = IB_EVENT_GID_CHANGE;
  130 
  131                 ib_dispatch_event(&event);
  132         }
  133 }
  134 
  135 static const char * const gid_type_str[] = {
  136         [IB_GID_TYPE_IB]        = "IB/RoCE v1",
  137         [IB_GID_TYPE_ROCE_UDP_ENCAP]    = "RoCE v2",
  138 };
  139 
  140 const char *ib_cache_gid_type_str(enum ib_gid_type gid_type)
  141 {
  142         if (gid_type < ARRAY_SIZE(gid_type_str) && gid_type_str[gid_type])
  143                 return gid_type_str[gid_type];
  144 
  145         return "Invalid GID type";
  146 }
  147 EXPORT_SYMBOL(ib_cache_gid_type_str);
  148 
  149 int ib_cache_gid_parse_type_str(const char *buf)
  150 {
  151         unsigned int i;
  152         size_t len;
  153         int err = -EINVAL;
  154 
  155         len = strlen(buf);
  156         if (len == 0)
  157                 return -EINVAL;
  158 
  159         if (buf[len - 1] == '\n')
  160                 len--;
  161 
  162         for (i = 0; i < ARRAY_SIZE(gid_type_str); ++i)
  163                 if (gid_type_str[i] && !strncmp(buf, gid_type_str[i], len) &&
  164                     len == strlen(gid_type_str[i])) {
  165                         err = i;
  166                         break;
  167                 }
  168 
  169         return err;
  170 }
  171 EXPORT_SYMBOL(ib_cache_gid_parse_type_str);
  172 
  173 /* This function expects that rwlock will be write locked in all
  174  * scenarios and that lock will be locked in sleep-able (RoCE)
  175  * scenarios.
  176  */
  177 static int write_gid(struct ib_device *ib_dev, u8 port,
  178                      struct ib_gid_table *table, int ix,
  179                      const union ib_gid *gid,
  180                      const struct ib_gid_attr *attr,
  181                      enum gid_table_write_action action,
  182                      bool  default_gid)
  183         __releases(&table->rwlock) __acquires(&table->rwlock)
  184 {
  185         int ret = 0;
  186         struct ifnet *old_net_dev;
  187         enum ib_gid_type old_gid_type;
  188 
  189         /* in rdma_cap_roce_gid_table, this funciton should be protected by a
  190          * sleep-able lock.
  191          */
  192 
  193         if (rdma_cap_roce_gid_table(ib_dev, port)) {
  194                 table->data_vec[ix].props |= GID_TABLE_ENTRY_INVALID;
  195                 write_unlock_irq(&table->rwlock);
  196                 /* GID_TABLE_WRITE_ACTION_MODIFY currently isn't supported by
  197                  * RoCE providers and thus only updates the cache.
  198                  */
  199                 if (action == GID_TABLE_WRITE_ACTION_ADD)
  200                         ret = ib_dev->add_gid(ib_dev, port, ix, gid, attr,
  201                                               &table->data_vec[ix].context);
  202                 else if (action == GID_TABLE_WRITE_ACTION_DEL)
  203                         ret = ib_dev->del_gid(ib_dev, port, ix,
  204                                               &table->data_vec[ix].context);
  205                 write_lock_irq(&table->rwlock);
  206         }
  207 
  208         old_net_dev = table->data_vec[ix].attr.ndev;
  209         old_gid_type = table->data_vec[ix].attr.gid_type;
  210         if (old_net_dev && old_net_dev != attr->ndev)
  211                 dev_put(old_net_dev);
  212         /* if modify_gid failed, just delete the old gid */
  213         if (ret || action == GID_TABLE_WRITE_ACTION_DEL) {
  214                 gid = &zgid;
  215                 attr = &zattr;
  216                 table->data_vec[ix].context = NULL;
  217         }
  218 
  219         memcpy(&table->data_vec[ix].gid, gid, sizeof(*gid));
  220         memcpy(&table->data_vec[ix].attr, attr, sizeof(*attr));
  221         if (default_gid) {
  222                 table->data_vec[ix].props |= GID_TABLE_ENTRY_DEFAULT;
  223                 if (action == GID_TABLE_WRITE_ACTION_DEL)
  224                         table->data_vec[ix].attr.gid_type = old_gid_type;
  225         }
  226         if (table->data_vec[ix].attr.ndev &&
  227             table->data_vec[ix].attr.ndev != old_net_dev)
  228                 dev_hold(table->data_vec[ix].attr.ndev);
  229 
  230         table->data_vec[ix].props &= ~GID_TABLE_ENTRY_INVALID;
  231 
  232         return ret;
  233 }
  234 
  235 static int add_gid(struct ib_device *ib_dev, u8 port,
  236                    struct ib_gid_table *table, int ix,
  237                    const union ib_gid *gid,
  238                    const struct ib_gid_attr *attr,
  239                    bool  default_gid) {
  240         return write_gid(ib_dev, port, table, ix, gid, attr,
  241                          GID_TABLE_WRITE_ACTION_ADD, default_gid);
  242 }
  243 
  244 static int modify_gid(struct ib_device *ib_dev, u8 port,
  245                       struct ib_gid_table *table, int ix,
  246                       const union ib_gid *gid,
  247                       const struct ib_gid_attr *attr,
  248                       bool  default_gid) {
  249         return write_gid(ib_dev, port, table, ix, gid, attr,
  250                          GID_TABLE_WRITE_ACTION_MODIFY, default_gid);
  251 }
  252 
  253 static int del_gid(struct ib_device *ib_dev, u8 port,
  254                    struct ib_gid_table *table, int ix,
  255                    bool  default_gid) {
  256         return write_gid(ib_dev, port, table, ix, &zgid, &zattr,
  257                          GID_TABLE_WRITE_ACTION_DEL, default_gid);
  258 }
  259 
  260 /* rwlock should be read locked */
  261 static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
  262                     const struct ib_gid_attr *val, bool default_gid,
  263                     unsigned long mask, int *pempty)
  264 {
  265         int i = 0;
  266         int found = -1;
  267         int empty = pempty ? -1 : 0;
  268 
  269         while (i < table->sz && (found < 0 || empty < 0)) {
  270                 struct ib_gid_table_entry *data = &table->data_vec[i];
  271                 struct ib_gid_attr *attr = &data->attr;
  272                 int curr_index = i;
  273 
  274                 i++;
  275 
  276                 if (data->props & GID_TABLE_ENTRY_INVALID)
  277                         continue;
  278 
  279                 if (empty < 0)
  280                         if (!memcmp(&data->gid, &zgid, sizeof(*gid)) &&
  281                             !memcmp(attr, &zattr, sizeof(*attr)) &&
  282                             !data->props)
  283                                 empty = curr_index;
  284 
  285                 if (found >= 0)
  286                         continue;
  287 
  288                 if (mask & GID_ATTR_FIND_MASK_GID_TYPE &&
  289                     attr->gid_type != val->gid_type)
  290                         continue;
  291 
  292                 if (mask & GID_ATTR_FIND_MASK_GID &&
  293                     memcmp(gid, &data->gid, sizeof(*gid)))
  294                         continue;
  295 
  296                 if (mask & GID_ATTR_FIND_MASK_NETDEV &&
  297                     attr->ndev != val->ndev)
  298                         continue;
  299 
  300                 if (mask & GID_ATTR_FIND_MASK_DEFAULT &&
  301                     !!(data->props & GID_TABLE_ENTRY_DEFAULT) !=
  302                     default_gid)
  303                         continue;
  304 
  305                 found = curr_index;
  306         }
  307 
  308         if (pempty)
  309                 *pempty = empty;
  310 
  311         return found;
  312 }
  313 
  314 static void addrconf_ifid_eui48(u8 *eui, struct ifnet *dev)
  315 {
  316         if (dev->if_addrlen != ETH_ALEN)
  317                 return;
  318         memcpy(eui, IF_LLADDR(dev), 3);
  319         memcpy(eui + 5, IF_LLADDR(dev) + 3, 3);
  320 
  321         /* NOTE: The scope ID is added by the GID to IP conversion */
  322 
  323         eui[3] = 0xFF;
  324         eui[4] = 0xFE;
  325         eui[0] ^= 2;
  326 }
  327 
  328 static void make_default_gid(struct ifnet *dev, union ib_gid *gid)
  329 {
  330         gid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
  331         addrconf_ifid_eui48(&gid->raw[8], dev);
  332 }
  333 
  334 int ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
  335                      union ib_gid *gid, struct ib_gid_attr *attr)
  336 {
  337         struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
  338         struct ib_gid_table *table;
  339         int ix;
  340         int ret = 0;
  341         int empty;
  342 
  343         table = ports_table[port - rdma_start_port(ib_dev)];
  344 
  345         if (!memcmp(gid, &zgid, sizeof(*gid)))
  346                 return -EINVAL;
  347 
  348         mutex_lock(&table->lock);
  349         write_lock_irq(&table->rwlock);
  350 
  351         ix = find_gid(table, gid, attr, false, GID_ATTR_FIND_MASK_GID |
  352                       GID_ATTR_FIND_MASK_GID_TYPE |
  353                       GID_ATTR_FIND_MASK_NETDEV, &empty);
  354         if (ix >= 0)
  355                 goto out_unlock;
  356 
  357         if (empty < 0) {
  358                 ret = -ENOSPC;
  359                 goto out_unlock;
  360         }
  361 
  362         ret = add_gid(ib_dev, port, table, empty, gid, attr, false);
  363         if (!ret)
  364                 dispatch_gid_change_event(ib_dev, port);
  365 
  366 out_unlock:
  367         write_unlock_irq(&table->rwlock);
  368         mutex_unlock(&table->lock);
  369         return ret;
  370 }
  371 
  372 int ib_cache_gid_del(struct ib_device *ib_dev, u8 port,
  373                      union ib_gid *gid, struct ib_gid_attr *attr)
  374 {
  375         struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
  376         struct ib_gid_table *table;
  377         int ix;
  378 
  379         table = ports_table[port - rdma_start_port(ib_dev)];
  380 
  381         mutex_lock(&table->lock);
  382         write_lock_irq(&table->rwlock);
  383 
  384         ix = find_gid(table, gid, attr, false,
  385                       GID_ATTR_FIND_MASK_GID      |
  386                       GID_ATTR_FIND_MASK_GID_TYPE |
  387                       GID_ATTR_FIND_MASK_NETDEV   |
  388                       GID_ATTR_FIND_MASK_DEFAULT,
  389                       NULL);
  390         if (ix < 0)
  391                 goto out_unlock;
  392 
  393         if (!del_gid(ib_dev, port, table, ix, false))
  394                 dispatch_gid_change_event(ib_dev, port);
  395 
  396 out_unlock:
  397         write_unlock_irq(&table->rwlock);
  398         mutex_unlock(&table->lock);
  399         return 0;
  400 }
  401 
  402 int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u8 port,
  403                                      struct ifnet *ndev)
  404 {
  405         struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
  406         struct ib_gid_table *table;
  407         int ix;
  408         bool deleted = false;
  409 
  410         table  = ports_table[port - rdma_start_port(ib_dev)];
  411 
  412         mutex_lock(&table->lock);
  413         write_lock_irq(&table->rwlock);
  414 
  415         for (ix = 0; ix < table->sz; ix++)
  416                 if (table->data_vec[ix].attr.ndev == ndev)
  417                         if (!del_gid(ib_dev, port, table, ix,
  418                                      !!(table->data_vec[ix].props &
  419                                         GID_TABLE_ENTRY_DEFAULT)))
  420                                 deleted = true;
  421 
  422         write_unlock_irq(&table->rwlock);
  423         mutex_unlock(&table->lock);
  424 
  425         if (deleted)
  426                 dispatch_gid_change_event(ib_dev, port);
  427 
  428         return 0;
  429 }
  430 
  431 static int __ib_cache_gid_get(struct ib_device *ib_dev, u8 port, int index,
  432                               union ib_gid *gid, struct ib_gid_attr *attr)
  433 {
  434         struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
  435         struct ib_gid_table *table;
  436 
  437         table = ports_table[port - rdma_start_port(ib_dev)];
  438 
  439         if (index < 0 || index >= table->sz)
  440                 return -EINVAL;
  441 
  442         if (table->data_vec[index].props & GID_TABLE_ENTRY_INVALID)
  443                 return -EAGAIN;
  444 
  445         memcpy(gid, &table->data_vec[index].gid, sizeof(*gid));
  446         if (attr) {
  447                 memcpy(attr, &table->data_vec[index].attr, sizeof(*attr));
  448                 /* make sure network device is valid and attached */
  449                 if (attr->ndev != NULL &&
  450                     (attr->ndev->if_flags & IFF_DYING) == 0 &&
  451                     attr->ndev->if_addr != NULL)
  452                         dev_hold(attr->ndev);
  453                 else
  454                         attr->ndev = NULL;
  455         }
  456 
  457         return 0;
  458 }
  459 
  460 static int _ib_cache_gid_table_find(struct ib_device *ib_dev,
  461                                     const union ib_gid *gid,
  462                                     const struct ib_gid_attr *val,
  463                                     unsigned long mask,
  464                                     u8 *port, u16 *index)
  465 {
  466         struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
  467         struct ib_gid_table *table;
  468         u8 p;
  469         int local_index;
  470         unsigned long flags;
  471 
  472         for (p = 0; p < ib_dev->phys_port_cnt; p++) {
  473                 table = ports_table[p];
  474                 read_lock_irqsave(&table->rwlock, flags);
  475                 local_index = find_gid(table, gid, val, false, mask, NULL);
  476                 if (local_index >= 0) {
  477                         if (index)
  478                                 *index = local_index;
  479                         if (port)
  480                                 *port = p + rdma_start_port(ib_dev);
  481                         read_unlock_irqrestore(&table->rwlock, flags);
  482                         return 0;
  483                 }
  484                 read_unlock_irqrestore(&table->rwlock, flags);
  485         }
  486 
  487         return -ENOENT;
  488 }
  489 
  490 static int ib_cache_gid_find(struct ib_device *ib_dev,
  491                              const union ib_gid *gid,
  492                              enum ib_gid_type gid_type,
  493                              struct ifnet *ndev, u8 *port,
  494                              u16 *index)
  495 {
  496         unsigned long mask = GID_ATTR_FIND_MASK_GID |
  497                              GID_ATTR_FIND_MASK_GID_TYPE;
  498         struct ib_gid_attr gid_attr_val = {.ndev = ndev, .gid_type = gid_type};
  499 
  500         if (ndev)
  501                 mask |= GID_ATTR_FIND_MASK_NETDEV;
  502 
  503         return _ib_cache_gid_table_find(ib_dev, gid, &gid_attr_val,
  504                                         mask, port, index);
  505 }
  506 
  507 int ib_find_cached_gid_by_port(struct ib_device *ib_dev,
  508                                const union ib_gid *gid,
  509                                enum ib_gid_type gid_type,
  510                                u8 port, struct ifnet *ndev,
  511                                u16 *index)
  512 {
  513         int local_index;
  514         struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
  515         struct ib_gid_table *table;
  516         unsigned long mask = GID_ATTR_FIND_MASK_GID |
  517                              GID_ATTR_FIND_MASK_GID_TYPE;
  518         struct ib_gid_attr val = {.ndev = ndev, .gid_type = gid_type};
  519         unsigned long flags;
  520 
  521         if (!rdma_is_port_valid(ib_dev, port))
  522                 return -ENOENT;
  523 
  524         table = ports_table[port - rdma_start_port(ib_dev)];
  525 
  526         if (ndev)
  527                 mask |= GID_ATTR_FIND_MASK_NETDEV;
  528 
  529         read_lock_irqsave(&table->rwlock, flags);
  530         local_index = find_gid(table, gid, &val, false, mask, NULL);
  531         if (local_index >= 0) {
  532                 if (index)
  533                         *index = local_index;
  534                 read_unlock_irqrestore(&table->rwlock, flags);
  535                 return 0;
  536         }
  537 
  538         read_unlock_irqrestore(&table->rwlock, flags);
  539         return -ENOENT;
  540 }
  541 EXPORT_SYMBOL(ib_find_cached_gid_by_port);
  542 
  543 /**
  544  * ib_find_gid_by_filter - Returns the GID table index where a specified
  545  * GID value occurs
  546  * @device: The device to query.
  547  * @gid: The GID value to search for.
  548  * @port_num: The port number of the device where the GID value could be
  549  *   searched.
  550  * @filter: The filter function is executed on any matching GID in the table.
  551  *   If the filter function returns true, the corresponding index is returned,
  552  *   otherwise, we continue searching the GID table. It's guaranteed that
  553  *   while filter is executed, ndev field is valid and the structure won't
  554  *   change. filter is executed in an atomic context. filter must not be NULL.
  555  * @index: The index into the cached GID table where the GID was found.  This
  556  *   parameter may be NULL.
  557  *
  558  * ib_cache_gid_find_by_filter() searches for the specified GID value
  559  * of which the filter function returns true in the port's GID table.
  560  * This function is only supported on RoCE ports.
  561  *
  562  */
  563 static int ib_cache_gid_find_by_filter(struct ib_device *ib_dev,
  564                                        const union ib_gid *gid,
  565                                        u8 port,
  566                                        bool (*filter)(const union ib_gid *,
  567                                                       const struct ib_gid_attr *,
  568                                                       void *),
  569                                        void *context,
  570                                        u16 *index)
  571 {
  572         struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
  573         struct ib_gid_table *table;
  574         unsigned int i;
  575         unsigned long flags;
  576         bool found = false;
  577 
  578         if (!ports_table)
  579                 return -EOPNOTSUPP;
  580 
  581         if (!rdma_is_port_valid(ib_dev, port))
  582                 return -EINVAL;
  583 
  584         if (!rdma_protocol_roce(ib_dev, port))
  585                 return -EPROTONOSUPPORT;
  586 
  587         table = ports_table[port - rdma_start_port(ib_dev)];
  588 
  589         read_lock_irqsave(&table->rwlock, flags);
  590         for (i = 0; i < table->sz; i++) {
  591                 struct ib_gid_attr attr;
  592 
  593                 if (table->data_vec[i].props & GID_TABLE_ENTRY_INVALID)
  594                         goto next;
  595 
  596                 if (memcmp(gid, &table->data_vec[i].gid, sizeof(*gid)))
  597                         goto next;
  598 
  599                 memcpy(&attr, &table->data_vec[i].attr, sizeof(attr));
  600 
  601                 if (filter(gid, &attr, context))
  602                         found = true;
  603 
  604 next:
  605                 if (found)
  606                         break;
  607         }
  608         read_unlock_irqrestore(&table->rwlock, flags);
  609 
  610         if (!found)
  611                 return -ENOENT;
  612 
  613         if (index)
  614                 *index = i;
  615         return 0;
  616 }
  617 
  618 static struct ib_gid_table *alloc_gid_table(int sz)
  619 {
  620         struct ib_gid_table *table =
  621                 kzalloc(sizeof(struct ib_gid_table), GFP_KERNEL);
  622 
  623         if (!table)
  624                 return NULL;
  625 
  626         table->data_vec = kcalloc(sz, sizeof(*table->data_vec), GFP_KERNEL);
  627         if (!table->data_vec)
  628                 goto err_free_table;
  629 
  630         mutex_init(&table->lock);
  631 
  632         table->sz = sz;
  633         rwlock_init(&table->rwlock);
  634 
  635         return table;
  636 
  637 err_free_table:
  638         kfree(table);
  639         return NULL;
  640 }
  641 
  642 static void release_gid_table(struct ib_gid_table *table)
  643 {
  644         if (table) {
  645                 kfree(table->data_vec);
  646                 kfree(table);
  647         }
  648 }
  649 
  650 static void cleanup_gid_table_port(struct ib_device *ib_dev, u8 port,
  651                                    struct ib_gid_table *table)
  652 {
  653         int i;
  654         bool deleted = false;
  655 
  656         if (!table)
  657                 return;
  658 
  659         write_lock_irq(&table->rwlock);
  660         for (i = 0; i < table->sz; ++i) {
  661                 if (memcmp(&table->data_vec[i].gid, &zgid,
  662                            sizeof(table->data_vec[i].gid)))
  663                         if (!del_gid(ib_dev, port, table, i,
  664                                      table->data_vec[i].props &
  665                                      GID_ATTR_FIND_MASK_DEFAULT))
  666                                 deleted = true;
  667         }
  668         write_unlock_irq(&table->rwlock);
  669 
  670         if (deleted)
  671                 dispatch_gid_change_event(ib_dev, port);
  672 }
  673 
  674 void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u8 port,
  675                                   struct ifnet *ndev,
  676                                   unsigned long gid_type_mask,
  677                                   enum ib_cache_gid_default_mode mode)
  678 {
  679         struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
  680         union ib_gid gid;
  681         struct ib_gid_attr gid_attr;
  682         struct ib_gid_attr zattr_type = zattr;
  683         struct ib_gid_table *table;
  684         unsigned int gid_type;
  685 
  686         table  = ports_table[port - rdma_start_port(ib_dev)];
  687 
  688         make_default_gid(ndev, &gid);
  689         memset(&gid_attr, 0, sizeof(gid_attr));
  690         gid_attr.ndev = ndev;
  691 
  692         /* Default GID is created using unique GUID and local subnet prefix,
  693          * as described in section 4.1.1 and 3.5.10 in IB spec 1.3.
  694          * Therefore don't create RoCEv2 default GID based on it that
  695          * resembles as IPv6 GID based on link local address when IPv6 is
  696          * disabled in kernel.
  697          */
  698 #ifndef INET6
  699         gid_type_mask &= ~BIT(IB_GID_TYPE_ROCE_UDP_ENCAP);
  700 #endif
  701 
  702         for (gid_type = 0; gid_type < IB_GID_TYPE_SIZE; ++gid_type) {
  703                 int ix;
  704                 union ib_gid current_gid;
  705                 struct ib_gid_attr current_gid_attr = {};
  706 
  707                 if (1UL << gid_type & ~gid_type_mask)
  708                         continue;
  709 
  710                 gid_attr.gid_type = gid_type;
  711 
  712                 mutex_lock(&table->lock);
  713                 write_lock_irq(&table->rwlock);
  714                 ix = find_gid(table, NULL, &gid_attr, true,
  715                               GID_ATTR_FIND_MASK_GID_TYPE |
  716                               GID_ATTR_FIND_MASK_DEFAULT,
  717                               NULL);
  718 
  719                 /* Coudn't find default GID location */
  720                 if (WARN_ON(ix < 0))
  721                         goto release;
  722 
  723                 zattr_type.gid_type = gid_type;
  724 
  725                 if (!__ib_cache_gid_get(ib_dev, port, ix,
  726                                         &current_gid, &current_gid_attr) &&
  727                     mode == IB_CACHE_GID_DEFAULT_MODE_SET &&
  728                     !memcmp(&gid, &current_gid, sizeof(gid)) &&
  729                     !memcmp(&gid_attr, &current_gid_attr, sizeof(gid_attr)))
  730                         goto release;
  731 
  732                 if (memcmp(&current_gid, &zgid, sizeof(current_gid)) ||
  733                     memcmp(&current_gid_attr, &zattr_type,
  734                            sizeof(current_gid_attr))) {
  735                         if (del_gid(ib_dev, port, table, ix, true)) {
  736                                 pr_warn("ib_cache_gid: can't delete index %d for default gid %pI6\n",
  737                                         ix, gid.raw);
  738                                 goto release;
  739                         } else {
  740                                 dispatch_gid_change_event(ib_dev, port);
  741                         }
  742                 }
  743 
  744                 if (mode == IB_CACHE_GID_DEFAULT_MODE_SET) {
  745                         if (add_gid(ib_dev, port, table, ix, &gid, &gid_attr, true))
  746                                 pr_warn("ib_cache_gid: unable to add default gid %pI6\n",
  747                                         gid.raw);
  748                         else
  749                                 dispatch_gid_change_event(ib_dev, port);
  750                 }
  751 
  752 release:
  753                 if (current_gid_attr.ndev)
  754                         dev_put(current_gid_attr.ndev);
  755                 write_unlock_irq(&table->rwlock);
  756                 mutex_unlock(&table->lock);
  757         }
  758 }
  759 
  760 static int gid_table_reserve_default(struct ib_device *ib_dev, u8 port,
  761                                      struct ib_gid_table *table)
  762 {
  763         unsigned int i;
  764         unsigned long roce_gid_type_mask;
  765         unsigned int num_default_gids;
  766         unsigned int current_gid = 0;
  767 
  768         roce_gid_type_mask = roce_gid_type_mask_support(ib_dev, port);
  769         num_default_gids = hweight_long(roce_gid_type_mask);
  770         for (i = 0; i < num_default_gids && i < table->sz; i++) {
  771                 struct ib_gid_table_entry *entry =
  772                         &table->data_vec[i];
  773 
  774                 entry->props |= GID_TABLE_ENTRY_DEFAULT;
  775                 current_gid = find_next_bit(&roce_gid_type_mask,
  776                                             BITS_PER_LONG,
  777                                             current_gid);
  778                 entry->attr.gid_type = current_gid++;
  779         }
  780 
  781         return 0;
  782 }
  783 
  784 static int _gid_table_setup_one(struct ib_device *ib_dev)
  785 {
  786         u8 port;
  787         struct ib_gid_table **table;
  788         int err = 0;
  789 
  790         table = kcalloc(ib_dev->phys_port_cnt, sizeof(*table), GFP_KERNEL);
  791 
  792         if (!table) {
  793                 pr_warn("failed to allocate ib gid cache for %s\n",
  794                         ib_dev->name);
  795                 return -ENOMEM;
  796         }
  797 
  798         for (port = 0; port < ib_dev->phys_port_cnt; port++) {
  799                 u8 rdma_port = port + rdma_start_port(ib_dev);
  800 
  801                 table[port] =
  802                         alloc_gid_table(
  803                                 ib_dev->port_immutable[rdma_port].gid_tbl_len);
  804                 if (!table[port]) {
  805                         err = -ENOMEM;
  806                         goto rollback_table_setup;
  807                 }
  808 
  809                 err = gid_table_reserve_default(ib_dev,
  810                                                 port + rdma_start_port(ib_dev),
  811                                                 table[port]);
  812                 if (err)
  813                         goto rollback_table_setup;
  814         }
  815 
  816         ib_dev->cache.gid_cache = table;
  817         return 0;
  818 
  819 rollback_table_setup:
  820         for (port = 0; port < ib_dev->phys_port_cnt; port++) {
  821                 cleanup_gid_table_port(ib_dev, port + rdma_start_port(ib_dev),
  822                                        table[port]);
  823                 release_gid_table(table[port]);
  824         }
  825 
  826         kfree(table);
  827         return err;
  828 }
  829 
  830 static void gid_table_release_one(struct ib_device *ib_dev)
  831 {
  832         struct ib_gid_table **table = ib_dev->cache.gid_cache;
  833         u8 port;
  834 
  835         if (!table)
  836                 return;
  837 
  838         for (port = 0; port < ib_dev->phys_port_cnt; port++)
  839                 release_gid_table(table[port]);
  840 
  841         kfree(table);
  842         ib_dev->cache.gid_cache = NULL;
  843 }
  844 
  845 static void gid_table_cleanup_one(struct ib_device *ib_dev)
  846 {
  847         struct ib_gid_table **table = ib_dev->cache.gid_cache;
  848         u8 port;
  849 
  850         if (!table)
  851                 return;
  852 
  853         for (port = 0; port < ib_dev->phys_port_cnt; port++)
  854                 cleanup_gid_table_port(ib_dev, port + rdma_start_port(ib_dev),
  855                                        table[port]);
  856 }
  857 
  858 static int gid_table_setup_one(struct ib_device *ib_dev)
  859 {
  860         int err;
  861 
  862         err = _gid_table_setup_one(ib_dev);
  863 
  864         if (err)
  865                 return err;
  866 
  867         err = roce_rescan_device(ib_dev);
  868 
  869         if (err) {
  870                 gid_table_cleanup_one(ib_dev);
  871                 gid_table_release_one(ib_dev);
  872         }
  873 
  874         return err;
  875 }
  876 
  877 int ib_get_cached_gid(struct ib_device *device,
  878                       u8                port_num,
  879                       int               index,
  880                       union ib_gid     *gid,
  881                       struct ib_gid_attr *gid_attr)
  882 {
  883         int res;
  884         unsigned long flags;
  885         struct ib_gid_table **ports_table = device->cache.gid_cache;
  886         struct ib_gid_table *table = ports_table[port_num - rdma_start_port(device)];
  887 
  888         if (!rdma_is_port_valid(device, port_num))
  889                 return -EINVAL;
  890 
  891         read_lock_irqsave(&table->rwlock, flags);
  892         res = __ib_cache_gid_get(device, port_num, index, gid, gid_attr);
  893         read_unlock_irqrestore(&table->rwlock, flags);
  894 
  895         return res;
  896 }
  897 EXPORT_SYMBOL(ib_get_cached_gid);
  898 
  899 int ib_find_cached_gid(struct ib_device *device,
  900                        const union ib_gid *gid,
  901                        enum ib_gid_type gid_type,
  902                        struct ifnet *ndev,
  903                        u8               *port_num,
  904                        u16              *index)
  905 {
  906         return ib_cache_gid_find(device, gid, gid_type, ndev, port_num, index);
  907 }
  908 EXPORT_SYMBOL(ib_find_cached_gid);
  909 
  910 int ib_find_gid_by_filter(struct ib_device *device,
  911                           const union ib_gid *gid,
  912                           u8 port_num,
  913                           bool (*filter)(const union ib_gid *gid,
  914                                          const struct ib_gid_attr *,
  915                                          void *),
  916                           void *context, u16 *index)
  917 {
  918         /* Only RoCE GID table supports filter function */
  919         if (!rdma_cap_roce_gid_table(device, port_num) && filter)
  920                 return -EPROTONOSUPPORT;
  921 
  922         return ib_cache_gid_find_by_filter(device, gid,
  923                                            port_num, filter,
  924                                            context, index);
  925 }
  926 EXPORT_SYMBOL(ib_find_gid_by_filter);
  927 
  928 int ib_get_cached_pkey(struct ib_device *device,
  929                        u8                port_num,
  930                        int               index,
  931                        u16              *pkey)
  932 {
  933         struct ib_pkey_cache *cache;
  934         unsigned long flags;
  935         int ret = 0;
  936 
  937         if (!rdma_is_port_valid(device, port_num))
  938                 return -EINVAL;
  939 
  940         read_lock_irqsave(&device->cache.lock, flags);
  941 
  942         cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];
  943 
  944         if (index < 0 || index >= cache->table_len)
  945                 ret = -EINVAL;
  946         else
  947                 *pkey = cache->table[index];
  948 
  949         read_unlock_irqrestore(&device->cache.lock, flags);
  950 
  951         return ret;
  952 }
  953 EXPORT_SYMBOL(ib_get_cached_pkey);
  954 
  955 int ib_find_cached_pkey(struct ib_device *device,
  956                         u8                port_num,
  957                         u16               pkey,
  958                         u16              *index)
  959 {
  960         struct ib_pkey_cache *cache;
  961         unsigned long flags;
  962         int i;
  963         int ret = -ENOENT;
  964         int partial_ix = -1;
  965 
  966         if (!rdma_is_port_valid(device, port_num))
  967                 return -EINVAL;
  968 
  969         read_lock_irqsave(&device->cache.lock, flags);
  970 
  971         cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];
  972 
  973         *index = -1;
  974 
  975         for (i = 0; i < cache->table_len; ++i)
  976                 if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
  977                         if (cache->table[i] & 0x8000) {
  978                                 *index = i;
  979                                 ret = 0;
  980                                 break;
  981                         } else
  982                                 partial_ix = i;
  983                 }
  984 
  985         if (ret && partial_ix >= 0) {
  986                 *index = partial_ix;
  987                 ret = 0;
  988         }
  989 
  990         read_unlock_irqrestore(&device->cache.lock, flags);
  991 
  992         return ret;
  993 }
  994 EXPORT_SYMBOL(ib_find_cached_pkey);
  995 
  996 int ib_find_exact_cached_pkey(struct ib_device *device,
  997                               u8                port_num,
  998                               u16               pkey,
  999                               u16              *index)
 1000 {
 1001         struct ib_pkey_cache *cache;
 1002         unsigned long flags;
 1003         int i;
 1004         int ret = -ENOENT;
 1005 
 1006         if (!rdma_is_port_valid(device, port_num))
 1007                 return -EINVAL;
 1008 
 1009         read_lock_irqsave(&device->cache.lock, flags);
 1010 
 1011         cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];
 1012 
 1013         *index = -1;
 1014 
 1015         for (i = 0; i < cache->table_len; ++i)
 1016                 if (cache->table[i] == pkey) {
 1017                         *index = i;
 1018                         ret = 0;
 1019                         break;
 1020                 }
 1021 
 1022         read_unlock_irqrestore(&device->cache.lock, flags);
 1023 
 1024         return ret;
 1025 }
 1026 EXPORT_SYMBOL(ib_find_exact_cached_pkey);
 1027 
 1028 int ib_get_cached_lmc(struct ib_device *device,
 1029                       u8                port_num,
 1030                       u8                *lmc)
 1031 {
 1032         unsigned long flags;
 1033         int ret = 0;
 1034 
 1035         if (!rdma_is_port_valid(device, port_num))
 1036                 return -EINVAL;
 1037 
 1038         read_lock_irqsave(&device->cache.lock, flags);
 1039         *lmc = device->cache.lmc_cache[port_num - rdma_start_port(device)];
 1040         read_unlock_irqrestore(&device->cache.lock, flags);
 1041 
 1042         return ret;
 1043 }
 1044 EXPORT_SYMBOL(ib_get_cached_lmc);
 1045 
 1046 static void ib_cache_update(struct ib_device *device,
 1047                             u8                port)
 1048 {
 1049         struct ib_port_attr       *tprops = NULL;
 1050         struct ib_pkey_cache      *pkey_cache = NULL, *old_pkey_cache;
 1051         struct ib_gid_cache {
 1052                 int             table_len;
 1053                 union ib_gid    table[0];
 1054         }                         *gid_cache = NULL;
 1055         int                        i;
 1056         int                        ret;
 1057         struct ib_gid_table       *table;
 1058         struct ib_gid_table      **ports_table = device->cache.gid_cache;
 1059         bool                       use_roce_gid_table =
 1060                                         rdma_cap_roce_gid_table(device, port);
 1061 
 1062         if (!rdma_is_port_valid(device, port))
 1063                 return;
 1064 
 1065         table = ports_table[port - rdma_start_port(device)];
 1066 
 1067         tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
 1068         if (!tprops)
 1069                 return;
 1070 
 1071         ret = ib_query_port(device, port, tprops);
 1072         if (ret) {
 1073                 pr_warn("ib_query_port failed (%d) for %s\n",
 1074                         ret, device->name);
 1075                 goto err;
 1076         }
 1077 
 1078         pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
 1079                              sizeof *pkey_cache->table, GFP_KERNEL);
 1080         if (!pkey_cache)
 1081                 goto err;
 1082 
 1083         pkey_cache->table_len = tprops->pkey_tbl_len;
 1084 
 1085         if (!use_roce_gid_table) {
 1086                 gid_cache = kmalloc(sizeof(*gid_cache) + tprops->gid_tbl_len *
 1087                             sizeof(*gid_cache->table), GFP_KERNEL);
 1088                 if (!gid_cache)
 1089                         goto err;
 1090 
 1091                 gid_cache->table_len = tprops->gid_tbl_len;
 1092         }
 1093 
 1094         for (i = 0; i < pkey_cache->table_len; ++i) {
 1095                 ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
 1096                 if (ret) {
 1097                         pr_warn("ib_query_pkey failed (%d) for %s (index %d)\n",
 1098                                 ret, device->name, i);
 1099                         goto err;
 1100                 }
 1101         }
 1102 
 1103         if (!use_roce_gid_table) {
 1104                 for (i = 0;  i < gid_cache->table_len; ++i) {
 1105                         ret = ib_query_gid(device, port, i,
 1106                                            gid_cache->table + i, NULL);
 1107                         if (ret) {
 1108                                 pr_warn("ib_query_gid failed (%d) for %s (index %d)\n",
 1109                                         ret, device->name, i);
 1110                                 goto err;
 1111                         }
 1112                 }
 1113         }
 1114 
 1115         write_lock_irq(&device->cache.lock);
 1116 
 1117         old_pkey_cache = device->cache.pkey_cache[port - rdma_start_port(device)];
 1118 
 1119         device->cache.pkey_cache[port - rdma_start_port(device)] = pkey_cache;
 1120         if (!use_roce_gid_table) {
 1121                 write_lock(&table->rwlock);
 1122                 for (i = 0; i < gid_cache->table_len; i++) {
 1123                         modify_gid(device, port, table, i, gid_cache->table + i,
 1124                                    &zattr, false);
 1125                 }
 1126                 write_unlock(&table->rwlock);
 1127         }
 1128 
 1129         device->cache.lmc_cache[port - rdma_start_port(device)] = tprops->lmc;
 1130 
 1131         write_unlock_irq(&device->cache.lock);
 1132 
 1133         kfree(gid_cache);
 1134         kfree(old_pkey_cache);
 1135         kfree(tprops);
 1136         return;
 1137 
 1138 err:
 1139         kfree(pkey_cache);
 1140         kfree(gid_cache);
 1141         kfree(tprops);
 1142 }
 1143 
 1144 static void ib_cache_task(struct work_struct *_work)
 1145 {
 1146         struct ib_update_work *work =
 1147                 container_of(_work, struct ib_update_work, work);
 1148 
 1149         ib_cache_update(work->device, work->port_num);
 1150         kfree(work);
 1151 }
 1152 
 1153 static void ib_cache_event(struct ib_event_handler *handler,
 1154                            struct ib_event *event)
 1155 {
 1156         struct ib_update_work *work;
 1157 
 1158         if (event->event == IB_EVENT_PORT_ERR    ||
 1159             event->event == IB_EVENT_PORT_ACTIVE ||
 1160             event->event == IB_EVENT_LID_CHANGE  ||
 1161             event->event == IB_EVENT_PKEY_CHANGE ||
 1162             event->event == IB_EVENT_SM_CHANGE   ||
 1163             event->event == IB_EVENT_CLIENT_REREGISTER ||
 1164             event->event == IB_EVENT_GID_CHANGE) {
 1165                 work = kmalloc(sizeof *work, GFP_ATOMIC);
 1166                 if (work) {
 1167                         INIT_WORK(&work->work, ib_cache_task);
 1168                         work->device   = event->device;
 1169                         work->port_num = event->element.port_num;
 1170                         queue_work(ib_wq, &work->work);
 1171                 }
 1172         }
 1173 }
 1174 
 1175 int ib_cache_setup_one(struct ib_device *device)
 1176 {
 1177         int p;
 1178         int err;
 1179 
 1180         rwlock_init(&device->cache.lock);
 1181 
 1182         device->cache.pkey_cache =
 1183                 kzalloc(sizeof *device->cache.pkey_cache *
 1184                         (rdma_end_port(device) - rdma_start_port(device) + 1), GFP_KERNEL);
 1185         device->cache.lmc_cache = kmalloc(sizeof *device->cache.lmc_cache *
 1186                                           (rdma_end_port(device) -
 1187                                            rdma_start_port(device) + 1),
 1188                                           GFP_KERNEL);
 1189         if (!device->cache.pkey_cache ||
 1190             !device->cache.lmc_cache) {
 1191                 pr_warn("Couldn't allocate cache for %s\n", device->name);
 1192                 return -ENOMEM;
 1193         }
 1194 
 1195         err = gid_table_setup_one(device);
 1196         if (err)
 1197                 /* Allocated memory will be cleaned in the release function */
 1198                 return err;
 1199 
 1200         for (p = 0; p <= rdma_end_port(device) - rdma_start_port(device); ++p)
 1201                 ib_cache_update(device, p + rdma_start_port(device));
 1202 
 1203         INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
 1204                               device, ib_cache_event);
 1205         err = ib_register_event_handler(&device->cache.event_handler);
 1206         if (err)
 1207                 goto err;
 1208 
 1209         return 0;
 1210 
 1211 err:
 1212         gid_table_cleanup_one(device);
 1213         return err;
 1214 }
 1215 
 1216 void ib_cache_release_one(struct ib_device *device)
 1217 {
 1218         int p;
 1219 
 1220         /*
 1221          * The release function frees all the cache elements.
 1222          * This function should be called as part of freeing
 1223          * all the device's resources when the cache could no
 1224          * longer be accessed.
 1225          */
 1226         if (device->cache.pkey_cache)
 1227                 for (p = 0;
 1228                      p <= rdma_end_port(device) - rdma_start_port(device); ++p)
 1229                         kfree(device->cache.pkey_cache[p]);
 1230 
 1231         gid_table_release_one(device);
 1232         kfree(device->cache.pkey_cache);
 1233         kfree(device->cache.lmc_cache);
 1234 }
 1235 
 1236 void ib_cache_cleanup_one(struct ib_device *device)
 1237 {
 1238         /* The cleanup function unregisters the event handler,
 1239          * waits for all in-progress workqueue elements and cleans
 1240          * up the GID cache. This function should be called after
 1241          * the device was removed from the devices list and all
 1242          * clients were removed, so the cache exists but is
 1243          * non-functional and shouldn't be updated anymore.
 1244          */
 1245         ib_unregister_event_handler(&device->cache.event_handler);
 1246         flush_workqueue(ib_wq);
 1247         gid_table_cleanup_one(device);
 1248 }
 1249 
 1250 void __init ib_cache_setup(void)
 1251 {
 1252         roce_gid_mgmt_init();
 1253 }
 1254 
 1255 void __exit ib_cache_cleanup(void)
 1256 {
 1257         roce_gid_mgmt_cleanup();
 1258 }

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