1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (c) Intel Corporation. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * NVMe over Fabrics discovery service 36 */ 37 38 #include "spdk/stdinc.h" 39 40 #include "nvmf_internal.h" 41 #include "transport.h" 42 43 #include "spdk/event.h" 44 #include "spdk/string.h" 45 #include "spdk/trace.h" 46 #include "spdk/nvmf_spec.h" 47 48 #include "spdk/bdev_module.h" 49 #include "spdk_internal/log.h" 50 51 static void 52 nvmf_update_discovery_log(struct spdk_nvmf_tgt *tgt) 53 { 54 uint64_t numrec = 0; 55 struct spdk_nvmf_subsystem *subsystem; 56 struct spdk_nvmf_listener *listener; 57 struct spdk_nvmf_discovery_log_page_entry *entry; 58 struct spdk_nvmf_discovery_log_page *disc_log; 59 size_t cur_size; 60 uint32_t sid; 61 62 SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Generating log page for genctr %" PRIu64 "\n", 63 tgt->discovery_genctr); 64 65 cur_size = sizeof(struct spdk_nvmf_discovery_log_page); 66 disc_log = calloc(1, cur_size); 67 if (disc_log == NULL) { 68 SPDK_ERRLOG("Discovery log page memory allocation error\n"); 69 return; 70 } 71 72 for (sid = 0; sid < tgt->opts.max_subsystems; sid++) { 73 subsystem = tgt->subsystems[sid]; 74 if (subsystem == NULL) { 75 continue; 76 } 77 78 if (subsystem->subtype == SPDK_NVMF_SUBTYPE_DISCOVERY) { 79 continue; 80 } 81 82 for (listener = spdk_nvmf_subsystem_get_first_listener(subsystem); listener != NULL; 83 listener = spdk_nvmf_subsystem_get_next_listener(subsystem, listener)) { 84 size_t new_size = cur_size + sizeof(*entry); 85 void *new_log_page = realloc(disc_log, new_size); 86 87 if (new_log_page == NULL) { 88 SPDK_ERRLOG("Discovery log page memory allocation error\n"); 89 break; 90 } 91 92 disc_log = new_log_page; 93 cur_size = new_size; 94 95 entry = &disc_log->entries[numrec]; 96 memset(entry, 0, sizeof(*entry)); 97 entry->portid = numrec; 98 entry->cntlid = 0xffff; 99 entry->asqsz = tgt->opts.max_queue_depth; 100 entry->subtype = subsystem->subtype; 101 snprintf(entry->subnqn, sizeof(entry->subnqn), "%s", subsystem->subnqn); 102 103 spdk_nvmf_transport_listener_discover(listener->transport, &listener->trid, entry); 104 105 numrec++; 106 } 107 } 108 109 disc_log->numrec = numrec; 110 disc_log->genctr = tgt->discovery_genctr; 111 112 free(tgt->discovery_log_page); 113 114 tgt->discovery_log_page = disc_log; 115 tgt->discovery_log_page_size = cur_size; 116 } 117 118 void 119 spdk_nvmf_get_discovery_log_page(struct spdk_nvmf_tgt *tgt, void *buffer, 120 uint64_t offset, uint32_t length) 121 { 122 size_t copy_len = 0; 123 size_t zero_len = length; 124 125 if (tgt->discovery_log_page == NULL || 126 tgt->discovery_log_page->genctr != tgt->discovery_genctr) { 127 nvmf_update_discovery_log(tgt); 128 } 129 130 /* Copy the valid part of the discovery log page, if any */ 131 if (tgt->discovery_log_page && offset < tgt->discovery_log_page_size) { 132 copy_len = spdk_min(tgt->discovery_log_page_size - offset, length); 133 zero_len -= copy_len; 134 memcpy(buffer, (char *)tgt->discovery_log_page + offset, copy_len); 135 } 136 137 /* Zero out the rest of the buffer */ 138 if (zero_len) { 139 memset((char *)buffer + copy_len, 0, zero_len); 140 } 141 142 /* We should have copied or zeroed every byte of the output buffer. */ 143 assert(copy_len + zero_len == length); 144 } 145