diff options
Diffstat (limited to 'src/spdk/lib/nvmf/ctrlr_discovery.c')
| -rw-r--r-- | src/spdk/lib/nvmf/ctrlr_discovery.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/src/spdk/lib/nvmf/ctrlr_discovery.c b/src/spdk/lib/nvmf/ctrlr_discovery.c new file mode 100644 index 00000000..305a6076 --- /dev/null +++ b/src/spdk/lib/nvmf/ctrlr_discovery.c @@ -0,0 +1,144 @@ +/*- + * BSD LICENSE + * + * Copyright (c) Intel Corporation. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * NVMe over Fabrics discovery service + */ + +#include "spdk/stdinc.h" + +#include "nvmf_internal.h" +#include "transport.h" + +#include "spdk/event.h" +#include "spdk/string.h" +#include "spdk/trace.h" +#include "spdk/nvmf_spec.h" + +#include "spdk/bdev_module.h" +#include "spdk_internal/log.h" + +static void +nvmf_update_discovery_log(struct spdk_nvmf_tgt *tgt) +{ + uint64_t numrec = 0; + struct spdk_nvmf_subsystem *subsystem; + struct spdk_nvmf_listener *listener; + struct spdk_nvmf_discovery_log_page_entry *entry; + struct spdk_nvmf_discovery_log_page *disc_log; + size_t cur_size; + uint32_t sid; + + SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Generating log page for genctr %" PRIu64 "\n", + tgt->discovery_genctr); + + cur_size = sizeof(struct spdk_nvmf_discovery_log_page); + disc_log = calloc(1, cur_size); + if (disc_log == NULL) { + SPDK_ERRLOG("Discovery log page memory allocation error\n"); + return; + } + + for (sid = 0; sid < tgt->opts.max_subsystems; sid++) { + subsystem = tgt->subsystems[sid]; + if (subsystem == NULL) { + continue; + } + + if (subsystem->subtype == SPDK_NVMF_SUBTYPE_DISCOVERY) { + continue; + } + + for (listener = spdk_nvmf_subsystem_get_first_listener(subsystem); listener != NULL; + listener = spdk_nvmf_subsystem_get_next_listener(subsystem, listener)) { + size_t new_size = cur_size + sizeof(*entry); + void *new_log_page = realloc(disc_log, new_size); + + if (new_log_page == NULL) { + SPDK_ERRLOG("Discovery log page memory allocation error\n"); + break; + } + + disc_log = new_log_page; + cur_size = new_size; + + entry = &disc_log->entries[numrec]; + memset(entry, 0, sizeof(*entry)); + entry->portid = numrec; + entry->cntlid = 0xffff; + entry->asqsz = listener->transport->opts.max_aq_depth; + entry->subtype = subsystem->subtype; + snprintf(entry->subnqn, sizeof(entry->subnqn), "%s", subsystem->subnqn); + + spdk_nvmf_transport_listener_discover(listener->transport, &listener->trid, entry); + + numrec++; + } + } + + disc_log->numrec = numrec; + disc_log->genctr = tgt->discovery_genctr; + + free(tgt->discovery_log_page); + + tgt->discovery_log_page = disc_log; + tgt->discovery_log_page_size = cur_size; +} + +void +spdk_nvmf_get_discovery_log_page(struct spdk_nvmf_tgt *tgt, void *buffer, + uint64_t offset, uint32_t length) +{ + size_t copy_len = 0; + size_t zero_len = length; + + if (tgt->discovery_log_page == NULL || + tgt->discovery_log_page->genctr != tgt->discovery_genctr) { + nvmf_update_discovery_log(tgt); + } + + /* Copy the valid part of the discovery log page, if any */ + if (tgt->discovery_log_page && offset < tgt->discovery_log_page_size) { + copy_len = spdk_min(tgt->discovery_log_page_size - offset, length); + zero_len -= copy_len; + memcpy(buffer, (char *)tgt->discovery_log_page + offset, copy_len); + } + + /* Zero out the rest of the buffer */ + if (zero_len) { + memset((char *)buffer + copy_len, 0, zero_len); + } + + /* We should have copied or zeroed every byte of the output buffer. */ + assert(copy_len + zero_len == length); +} |