| /* (C) 2018-2019 by Harald Welte <laforge@gnumonks.org> |
| * |
| * All Rights Reserved |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| */ |
| |
| |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <errno.h> |
| |
| #include <pthread.h> |
| |
| #include <talloc.h> |
| |
| #include <osmocom/core/linuxlist.h> |
| #include <osmocom/core/utils.h> |
| |
| #include "slotmap.h" |
| #include "debug.h" |
| |
| const struct value_string slot_map_state_name[] = { |
| { SLMAP_S_NEW, "NEW" }, |
| { SLMAP_S_UNACKNOWLEDGED, "UNACKNOWLEDGED" }, |
| { SLMAP_S_ACTIVE, "ACTIVE" }, |
| { SLMAP_S_DELETE_REQ, "DELETE_REQ" }, |
| { SLMAP_S_DELETING, "DELETING" }, |
| { 0, NULL } |
| }; |
| |
| const char *slotmap_name(char *buf, size_t buf_len, const struct slot_mapping *map) |
| { |
| snprintf(buf, buf_len, "B(%u:%u) <-> C(%u:%u)", |
| map->bank.bank_id, map->bank.slot_nr, map->client.client_id, map->client.slot_nr); |
| return buf; |
| } |
| |
| uint32_t slotmap_get_id(const struct slot_mapping *map) |
| { |
| return (map->bank.bank_id << 16) | map->bank.slot_nr; |
| } |
| |
| /* thread-safe lookup of map by client:slot */ |
| struct slot_mapping *slotmap_by_client(struct slotmaps *maps, const struct client_slot *client) |
| { |
| struct slot_mapping *map; |
| |
| slotmaps_rdlock(maps); |
| llist_for_each_entry(map, &maps->mappings, list) { |
| if (client_slot_equals(&map->client, client)) { |
| slotmaps_unlock(maps); |
| return map; |
| } |
| } |
| slotmaps_unlock(maps); |
| return NULL; |
| } |
| |
| /* thread-safe lookup of map by bank:slot */ |
| struct slot_mapping *slotmap_by_bank(struct slotmaps *maps, const struct bank_slot *bank) |
| { |
| struct slot_mapping *map; |
| |
| slotmaps_rdlock(maps); |
| llist_for_each_entry(map, &maps->mappings, list) { |
| if (bank_slot_equals(&map->bank, bank)) { |
| slotmaps_unlock(maps); |
| return map; |
| } |
| } |
| slotmaps_unlock(maps); |
| return NULL; |
| |
| } |
| |
| /* thread-safe creating of a new bank<->client map */ |
| struct slot_mapping *slotmap_add(struct slotmaps *maps, const struct bank_slot *bank, |
| const struct client_slot *client) |
| { |
| struct slot_mapping *map; |
| char mapname[64]; |
| |
| /* We assume a single thread (main thread) will ever update the mappings, |
| * and hence we don't have any races by first grabbing + releasing the read |
| * lock twice before grabbing the writelock below */ |
| |
| map = slotmap_by_bank(maps, bank); |
| if (map) { |
| LOGP(DSLOTMAP, LOGL_ERROR, "BANKD %u:%u already in use, cannot add new map\n", |
| bank->bank_id, bank->slot_nr); |
| return NULL; |
| } |
| |
| map = slotmap_by_client(maps, client); |
| if (map) { |
| LOGP(DSLOTMAP, LOGL_ERROR, "CLIENT %u:%u already in use, cannot add new map\n", |
| client->client_id, client->slot_nr); |
| return NULL; |
| } |
| |
| /* allocate new mapping and add to list of mappings */ |
| map = talloc_zero(maps, struct slot_mapping); |
| if (!map) |
| return NULL; |
| |
| map->maps = maps; |
| map->bank = *bank; |
| map->client = *client; |
| |
| slotmaps_wrlock(maps); |
| llist_add_tail(&map->list, &maps->mappings); |
| #ifdef REMSIM_SERVER |
| map->state = SLMAP_S_NEW; |
| INIT_LLIST_HEAD(&map->bank_list); /* to ensure llist_del() always succeeds */ |
| #endif |
| slotmaps_unlock(maps); |
| |
| LOGP(DSLOTMAP, LOGL_INFO, "Slot Map %s added\n", slotmap_name(mapname, sizeof(mapname), map)); |
| |
| return map; |
| } |
| |
| /* thread-safe removal of a bank<->client map */ |
| void _slotmap_del(struct slotmaps *maps, struct slot_mapping *map) |
| { |
| char mapname[64]; |
| |
| LOGP(DSLOTMAP, LOGL_INFO, "Slot Map %s deleted\n", slotmap_name(mapname, sizeof(mapname), map)); |
| |
| llist_del(&map->list); |
| #ifdef REMSIM_SERVER |
| llist_del(&map->bank_list); |
| #endif |
| |
| talloc_free(map); |
| } |
| /* thread-safe removal of a bank<->client map */ |
| void slotmap_del(struct slotmaps *maps, struct slot_mapping *map) |
| { |
| slotmaps_wrlock(maps); |
| _slotmap_del(maps, map); |
| slotmaps_unlock(maps); |
| } |
| |
| |
| /* thread-safe removal of all bank<->client maps */ |
| void slotmap_del_all(struct slotmaps *maps) |
| { |
| struct slot_mapping *map, *map2; |
| |
| slotmaps_wrlock(maps); |
| llist_for_each_entry_safe(map, map2, &maps->mappings, list) { |
| _slotmap_del(maps, map); |
| } |
| slotmaps_unlock(maps); |
| } |
| |
| struct slotmaps *slotmap_init(void *ctx) |
| { |
| struct slotmaps *sm = talloc_zero(ctx, struct slotmaps); |
| |
| INIT_LLIST_HEAD(&sm->mappings); |
| pthread_rwlock_init(&sm->rwlock, NULL); |
| |
| return sm; |
| } |
| |
| #ifdef REMSIM_SERVER |
| |
| void _Slotmap_state_change(struct slot_mapping *map, enum slot_mapping_state new_state, |
| struct llist_head *new_bank_list, const char *file, int line) |
| { |
| char mapname[64]; |
| |
| LOGPSRC(DMAIN, LOGL_INFO, file, line, "Slot Map %s state change: %s -> %s\n", |
| slotmap_name(mapname, sizeof(mapname), map), |
| get_value_string(slot_map_state_name, map->state), |
| get_value_string(slot_map_state_name, new_state)); |
| |
| map->state = new_state; |
| llist_del(&map->bank_list); |
| if (new_bank_list) |
| llist_add_tail(&map->bank_list, new_bank_list); |
| else |
| INIT_LLIST_HEAD(&map->bank_list); |
| } |
| |
| |
| void Slotmap_state_change(struct slot_mapping *map, enum slot_mapping_state new_state, |
| struct llist_head *new_bank_list, const char *file, int line) |
| { |
| slotmaps_wrlock(map->maps); |
| _Slotmap_state_change(map, new_state, new_bank_list, file, line); |
| slotmaps_unlock(map->maps); |
| } |
| |
| #endif |