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/*-
* 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);
}
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