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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/string.h"
#include "spdk/trace.h"
#include "spdk/nvmf_spec.h"
#include "spdk/bdev_module.h"
#include "spdk_internal/log.h"
static struct spdk_nvmf_discovery_log_page *
nvmf_generate_discovery_log(struct spdk_nvmf_tgt *tgt, const char *hostnqn, size_t *log_page_size)
{
uint64_t numrec = 0;
struct spdk_nvmf_subsystem *subsystem;
struct spdk_nvmf_subsystem_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 NULL;
}
for (sid = 0; sid < tgt->max_subsystems; sid++) {
subsystem = tgt->subsystems[sid];
if ((subsystem == NULL) ||
(subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE) ||
(subsystem->state == SPDK_NVMF_SUBSYSTEM_DEACTIVATING)) {
continue;
}
if (subsystem->subtype == SPDK_NVMF_SUBTYPE_DISCOVERY) {
continue;
}
if (!spdk_nvmf_subsystem_host_allowed(subsystem, hostnqn)) {
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);
nvmf_transport_listener_discover(listener->transport, listener->trid, entry);
numrec++;
}
}
disc_log->numrec = numrec;
disc_log->genctr = tgt->discovery_genctr;
*log_page_size = cur_size;
return disc_log;
}
void
nvmf_get_discovery_log_page(struct spdk_nvmf_tgt *tgt, const char *hostnqn, struct iovec *iov,
uint32_t iovcnt, uint64_t offset, uint32_t length)
{
size_t copy_len = 0;
size_t zero_len = 0;
struct iovec *tmp;
size_t log_page_size = 0;
struct spdk_nvmf_discovery_log_page *discovery_log_page;
discovery_log_page = nvmf_generate_discovery_log(tgt, hostnqn, &log_page_size);
/* Copy the valid part of the discovery log page, if any */
if (discovery_log_page) {
for (tmp = iov; tmp < iov + iovcnt; tmp++) {
copy_len = spdk_min(tmp->iov_len, length);
copy_len = spdk_min(log_page_size - offset, copy_len);
memcpy(tmp->iov_base, (char *)discovery_log_page + offset, copy_len);
offset += copy_len;
length -= copy_len;
zero_len = tmp->iov_len - copy_len;
if (log_page_size <= offset || length == 0) {
break;
}
}
/* Zero out the rest of the payload */
if (zero_len) {
memset((char *)tmp->iov_base + copy_len, 0, zero_len);
}
for (++tmp; tmp < iov + iovcnt; tmp++) {
memset((char *)tmp->iov_base, 0, tmp->iov_len);
}
free(discovery_log_page);
}
}
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