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// SPDX-License-Identifier: LGPL-2.1-or-later
/**
* This file is part of libnvme.
* Copyright (c) 2022 Code Construct Pty Ltd.
*
* Authors: Jeremy Kerr <jk@codeconstruct.com.au>
*/
/**
* mi-conf: query a device for optimal MTU and set for both the local MCTP
* route (through dbus to mctpd) and the device itself (through NVMe-MI
* configuration commands)
*/
#include <err.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <libnvme-mi.h>
#include <ccan/array_size/array_size.h>
#include <ccan/endian/endian.h>
#include <systemd/sd-bus.h>
#define MCTP_DBUS_NAME "xyz.openbmc_project.MCTP"
#define MCTP_DBUS_PATH "/xyz/openbmc_project/mctp"
#define MCTP_DBUS_EP_IFACE "au.com.CodeConstruct.MCTP.Endpoint"
static int parse_mctp(const char *devstr, unsigned int *net, uint8_t *eid)
{
int rc;
rc = sscanf(devstr, "mctp:%u,%hhu", net, eid);
if (rc != 2)
return -1;
return 0;
}
int find_port(nvme_mi_ep_t ep, uint8_t *portp, uint16_t *mtup)
{
struct nvme_mi_read_nvm_ss_info ss_info;
struct nvme_mi_read_port_info port_info;
uint8_t port;
bool found;
int rc;
/* query number of ports */
rc = nvme_mi_mi_read_mi_data_subsys(ep, &ss_info);
if (rc) {
warn("Failed reading subsystem info");
return -1;
}
found = false;
for (port = 0; port <= ss_info.nump; port++) {
rc = nvme_mi_mi_read_mi_data_port(ep, port, &port_info);
if (rc) {
warn("Failed reading port info for port %ud", port);
return -1;
}
/* skip non-SMBus ports */
if (port_info.portt != 0x2)
continue;
if (found) {
warn("Mutliple SMBus ports; skipping duplicate");
} else {
*portp = port;
*mtup = port_info.mmctptus;
found = true;
}
}
return found ? 0 : 1;
}
int set_local_mtu(sd_bus *bus, unsigned int net, uint8_t eid, uint32_t mtu)
{
sd_bus_error err = SD_BUS_ERROR_NULL;
sd_bus_message *resp;
char *ep_path;
int rc;
rc = asprintf(&ep_path, "%s/%u/%hhu", MCTP_DBUS_PATH, net, eid);
if (rc < 0) {
warn("Failed to create dbus path");
return -1;
}
/* The NVMe-MI interfaces refer to their MTU as *not* including the
* 4-byte MCTP header, whereas the MCTP specs *do* include it. When
* we're setting the route MTU, we're using to the MCTP-style MTU,
* which needs the extra four bytes included
*/
mtu += 4;
rc = sd_bus_call_method(bus, MCTP_DBUS_NAME, ep_path,
MCTP_DBUS_EP_IFACE, "SetMTU", &err, &resp,
"u", mtu);
if (rc < 0) {
warnx("Failed to set local MTU: %s", strerror(-rc));
return -1;
}
return 0;
}
int main(int argc, char **argv)
{
uint16_t cur_mtu, mtu;
const char *devstr;
uint8_t eid, port;
nvme_root_t root;
unsigned int net;
nvme_mi_ep_t ep;
sd_bus *bus;
int rc;
if (argc != 2) {
fprintf(stderr, "usage: %s mctp:<net>,<eid>\n", argv[0]);
return EXIT_FAILURE;
}
devstr = argv[1];
rc = parse_mctp(devstr, &net, &eid);
if (rc)
errx(EXIT_FAILURE, "can't parse MI device string '%s'", devstr);
root = nvme_mi_create_root(stderr, DEFAULT_LOGLEVEL);
if (!root)
err(EXIT_FAILURE, "can't create NVMe root");
ep = nvme_mi_open_mctp(root, net, eid);
if (!ep) {
warnx("can't open MCTP endpoint %d:%d", net, eid);
goto out_free_root;
}
rc = sd_bus_default_system(&bus);
if (rc < 0) {
goto out_close_ep;
warnx("Failed opening D-Bus: %s\n", strerror(-rc));
}
rc = find_port(ep, &port, &mtu);
if (rc) {
warnx("Can't find SMBus port information");
goto out_close_bus;
}
rc = nvme_mi_mi_config_get_mctp_mtu(ep, port, &cur_mtu);
if (rc) {
cur_mtu = 0;
warn("Can't query current MTU; no way to revert on failure");
}
if (mtu == cur_mtu) {
printf("Current MTU (%d) is already at max\n", cur_mtu);
goto out_close_bus;
}
rc = nvme_mi_mi_config_set_mctp_mtu(ep, port, mtu);
if (rc) {
warn("Can't set MCTP MTU");
goto out_close_bus;
}
rc = set_local_mtu(bus, net, eid, mtu);
if (rc) {
/* revert if we have an old setting */
if (cur_mtu) {
rc = nvme_mi_mi_config_set_mctp_mtu(ep, port, cur_mtu);
if (rc)
warn("Failed to restore previous MTU!");
rc = -1;
}
} else {
printf("MTU for port %u set to %d (was %d)\n",
port, mtu, cur_mtu);
}
out_close_bus:
sd_bus_close(bus);
out_close_ep:
nvme_mi_close(ep);
out_free_root:
nvme_mi_free_root(root);
return rc ? EXIT_FAILURE : EXIT_SUCCESS;
}
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