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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023-2024 Chelsio Communications, Inc.
* Written by: John Baldwin <jhb@FreeBSD.org>
*/
#include <sys/socket.h>
#include <err.h>
#include <libnvmf.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include "nvmecontrol.h"
#include "fabrics.h"
/*
* See comment about other possible settings in connect.c.
*/
static struct options {
const char *dev;
const char *transport;
const char *address;
const char *hostnqn;
uint32_t kato;
uint16_t num_io_queues;
uint16_t queue_size;
bool data_digests;
bool flow_control;
bool header_digests;
} opt = {
.dev = NULL,
.transport = "tcp",
.address = NULL,
.hostnqn = NULL,
.kato = NVMF_KATO_DEFAULT / 1000,
.num_io_queues = 1,
.queue_size = 0,
.data_digests = false,
.flow_control = false,
.header_digests = false,
};
static void
tcp_association_params(struct nvmf_association_params *params)
{
params->tcp.pda = 0;
params->tcp.header_digests = opt.header_digests;
params->tcp.data_digests = opt.data_digests;
/* XXX */
params->tcp.maxr2t = 1;
}
static int
reconnect_nvm_controller(int fd, enum nvmf_trtype trtype, int adrfam,
const char *address, const char *port)
{
struct nvme_controller_data cdata;
struct nvmf_association_params aparams;
struct nvmf_reconnect_params rparams;
struct nvmf_qpair *admin, **io;
int error;
error = nvmf_reconnect_params(fd, &rparams);
if (error != 0) {
warnc(error, "Failed to fetch reconnect parameters");
return (EX_IOERR);
}
memset(&aparams, 0, sizeof(aparams));
aparams.sq_flow_control = opt.flow_control;
switch (trtype) {
case NVMF_TRTYPE_TCP:
tcp_association_params(&aparams);
break;
default:
warnx("Unsupported transport %s", nvmf_transport_type(trtype));
return (EX_UNAVAILABLE);
}
io = calloc(opt.num_io_queues, sizeof(*io));
error = connect_nvm_queues(&aparams, trtype, adrfam, address, port,
rparams.cntlid, rparams.subnqn, opt.hostnqn, opt.kato, &admin, io,
opt.num_io_queues, opt.queue_size, &cdata);
if (error != 0)
return (error);
error = nvmf_reconnect_host(fd, admin, opt.num_io_queues, io, &cdata);
if (error != 0) {
warnc(error, "Failed to handoff queues to kernel");
return (EX_IOERR);
}
free(io);
return (0);
}
static void
reconnect_fn(const struct cmd *f, int argc, char *argv[])
{
enum nvmf_trtype trtype;
const char *address, *port;
char *tofree;
int error, fd;
if (arg_parse(argc, argv, f))
return;
if (strcasecmp(opt.transport, "tcp") == 0) {
trtype = NVMF_TRTYPE_TCP;
} else
errx(EX_USAGE, "Unsupported or invalid transport");
nvmf_parse_address(opt.address, &address, &port, &tofree);
open_dev(opt.dev, &fd, 1, 1);
if (port == NULL)
errx(EX_USAGE, "Explicit port required");
error = reconnect_nvm_controller(fd, trtype, AF_UNSPEC, address, port);
if (error != 0)
exit(error);
close(fd);
free(tofree);
}
static const struct opts reconnect_opts[] = {
#define OPT(l, s, t, opt, addr, desc) { l, s, t, &opt.addr, desc }
OPT("transport", 't', arg_string, opt, transport,
"Transport type"),
OPT("nr-io-queues", 'i', arg_uint16, opt, num_io_queues,
"Number of I/O queues"),
OPT("queue-size", 'Q', arg_uint16, opt, queue_size,
"Number of entries in each I/O queue"),
OPT("keep-alive-tmo", 'k', arg_uint32, opt, kato,
"Keep Alive timeout (in seconds)"),
OPT("hostnqn", 'q', arg_string, opt, hostnqn,
"Host NQN"),
OPT("flow_control", 'F', arg_none, opt, flow_control,
"Request SQ flow control"),
OPT("hdr_digests", 'g', arg_none, opt, header_digests,
"Enable TCP PDU header digests"),
OPT("data_digests", 'G', arg_none, opt, data_digests,
"Enable TCP PDU data digests"),
{ NULL, 0, arg_none, NULL, NULL }
};
#undef OPT
static const struct args reconnect_args[] = {
{ arg_string, &opt.dev, "controller-id" },
{ arg_string, &opt.address, "address" },
{ arg_none, NULL, NULL },
};
static struct cmd reconnect_cmd = {
.name = "reconnect",
.fn = reconnect_fn,
.descr = "Reconnect to a fabrics controller",
.ctx_size = sizeof(opt),
.opts = reconnect_opts,
.args = reconnect_args,
};
CMD_COMMAND(reconnect_cmd);
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