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umad.c
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/*
* Copyright (c) 2004-2009 Voltaire Inc. All rights reserved.
* Copyright (c) 2014 Intel Corporation. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <config.h>
#include <sys/poll.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <dirent.h>
#include <ctype.h>
#include <inttypes.h>
#include <util/compiler.h>
#include <infiniband/umad.h>
#define IB_OPENIB_OUI (0x001405)
#include <valgrind/memcheck.h>
#include "sysfs.h"
typedef struct ib_user_mad_reg_req {
uint32_t id;
uint32_t method_mask[4];
uint8_t qpn;
uint8_t mgmt_class;
uint8_t mgmt_class_version;
uint8_t oui[3];
uint8_t rmpp_version;
} ib_user_mad_reg_req_t;
struct ib_user_mad_reg_req2 {
uint32_t id;
uint32_t qpn;
uint8_t mgmt_class;
uint8_t mgmt_class_version;
uint16_t res;
uint32_t flags;
uint64_t method_mask[2];
uint32_t oui;
uint8_t rmpp_version;
uint8_t reserved[3];
};
#define IBWARN(fmt, args...) fprintf(stderr, "ibwarn: [%d] %s: " fmt "\n", getpid(), __func__, ## args)
#define TRACE if (umaddebug) IBWARN
#define DEBUG if (umaddebug) IBWARN
static int umaddebug = 0;
#define UMAD_DEV_FILE_SZ 256
static const char *def_ca_name = "mthca0";
static int def_ca_port = 1;
static unsigned new_user_mad_api;
static unsigned int get_abi_version(void)
{
static unsigned int abi_version;
if (abi_version != 0)
return abi_version & 0x7FFFFFFF;
if (sys_read_uint(IB_UMAD_ABI_DIR, IB_UMAD_ABI_FILE, &abi_version) <
0) {
IBWARN("can't read ABI version from %s/%s (%m): is ib_umad module loaded?",
IB_UMAD_ABI_DIR, IB_UMAD_ABI_FILE);
abi_version = (1U) << 31;
return 0;
}
if (abi_version < IB_UMAD_ABI_VERSION) {
abi_version = (1U) << 31;
return 0;
}
return abi_version;
}
/*************************************
* Port
*/
static int find_cached_ca(const char *ca_name, umad_ca_t * ca)
{
return 0; /* caching not implemented yet */
}
static int put_ca(umad_ca_t * ca)
{
return 0; /* caching not implemented yet */
}
static int release_port(umad_port_t * port)
{
free(port->pkeys);
port->pkeys = NULL;
port->pkeys_size = 0;
return 0;
}
static int check_for_digit_name(const struct dirent *dent)
{
const char *p = dent->d_name;
while (*p && isdigit(*p))
p++;
return *p ? 0 : 1;
}
static int get_port(const char *ca_name, const char *dir, int portnum, umad_port_t * port)
{
char port_dir[256];
union umad_gid gid;
struct dirent **namelist = NULL;
int i, len, num_pkeys = 0;
uint32_t capmask;
strncpy(port->ca_name, ca_name, sizeof port->ca_name - 1);
port->portnum = portnum;
port->pkeys = NULL;
len = snprintf(port_dir, sizeof(port_dir), "%s/%d", dir, portnum);
if (len < 0 || len > sizeof(port_dir))
goto clean;
if (sys_read_uint(port_dir, SYS_PORT_LMC, &port->lmc) < 0)
goto clean;
if (sys_read_uint(port_dir, SYS_PORT_SMLID, &port->sm_lid) < 0)
goto clean;
if (sys_read_uint(port_dir, SYS_PORT_SMSL, &port->sm_sl) < 0)
goto clean;
if (sys_read_uint(port_dir, SYS_PORT_LID, &port->base_lid) < 0)
goto clean;
if (sys_read_uint(port_dir, SYS_PORT_STATE, &port->state) < 0)
goto clean;
if (sys_read_uint(port_dir, SYS_PORT_PHY_STATE, &port->phys_state) < 0)
goto clean;
sys_read_uint(port_dir, SYS_PORT_RATE, &port->rate);
if (sys_read_uint(port_dir, SYS_PORT_CAPMASK, &capmask) < 0)
goto clean;
if (sys_read_string(port_dir, SYS_PORT_LINK_LAYER,
port->link_layer, UMAD_CA_NAME_LEN) < 0)
/* assume IB by default */
sprintf(port->link_layer, "IB");
port->capmask = htobe32(capmask);
if (sys_read_gid(port_dir, SYS_PORT_GID, &gid) < 0)
goto clean;
port->gid_prefix = gid.global.subnet_prefix;
port->port_guid = gid.global.interface_id;
snprintf(port_dir + len, sizeof(port_dir) - len, "/pkeys");
num_pkeys = scandir(port_dir, &namelist, check_for_digit_name, NULL);
if (num_pkeys <= 0) {
IBWARN("no pkeys found for %s:%u (at dir %s)...",
port->ca_name, port->portnum, port_dir);
goto clean;
}
port->pkeys = calloc(num_pkeys, sizeof(port->pkeys[0]));
if (!port->pkeys) {
IBWARN("get_port: calloc failed: %s", strerror(errno));
goto clean;
}
for (i = 0; i < num_pkeys; i++) {
unsigned idx, val;
idx = strtoul(namelist[i]->d_name, NULL, 0);
sys_read_uint(port_dir, namelist[i]->d_name, &val);
port->pkeys[idx] = val;
free(namelist[i]);
}
port->pkeys_size = num_pkeys;
free(namelist);
namelist = NULL;
port_dir[len] = '\0';
/* FIXME: handle gids */
return 0;
clean:
if (namelist) {
for (i = 0; i < num_pkeys; i++)
free(namelist[i]);
free(namelist);
}
if (port->pkeys)
free(port->pkeys);
return -EIO;
}
static int release_ca(umad_ca_t * ca)
{
int i;
for (i = 0; i <= ca->numports; i++) {
if (!ca->ports[i])
continue;
release_port(ca->ports[i]);
free(ca->ports[i]);
ca->ports[i] = NULL;
}
return 0;
}
/*
* if *port > 0, check ca[port] state. Otherwise set *port to
* the first port that is active, and if such is not found, to
* the first port that is link up and if none are linkup, then
* the first port that is not disabled. Otherwise return -1.
*/
static int resolve_ca_port(const char *ca_name, int *port)
{
umad_ca_t ca;
int active = -1, up = -1;
int i, ret = 0;
TRACE("checking ca '%s'", ca_name);
if (umad_get_ca(ca_name, &ca) < 0)
return -1;
if (ca.node_type == 2) {
*port = 0; /* switch sma port 0 */
ret = 1;
goto Exit;
}
if (*port > 0) { /* check only the port the user wants */
if (*port > ca.numports) {
ret = -1;
goto Exit;
}
if (!ca.ports[*port]) {
ret = -1;
goto Exit;
}
if (strcmp(ca.ports[*port]->link_layer, "InfiniBand") &&
strcmp(ca.ports[*port]->link_layer, "IB")) {
ret = -1;
goto Exit;
}
if (ca.ports[*port]->state == 4) {
ret = 1;
goto Exit;
}
if (ca.ports[*port]->phys_state != 3)
goto Exit;
ret = -1;
goto Exit;
}
for (i = 0; i <= ca.numports; i++) {
DEBUG("checking port %d", i);
if (!ca.ports[i])
continue;
if (strcmp(ca.ports[i]->link_layer, "InfiniBand") &&
strcmp(ca.ports[i]->link_layer, "IB"))
continue;
if (up < 0 && ca.ports[i]->phys_state == 5)
up = *port = i;
if (ca.ports[i]->state == 4) {
active = *port = i;
DEBUG("found active port %d", i);
break;
}
}
if (active == -1 && up == -1) { /* no active or linkup port found */
for (i = 0; i <= ca.numports; i++) {
DEBUG("checking port %d", i);
if (!ca.ports[i])
continue;
if (ca.ports[i]->phys_state != 3) {
up = *port = i;
break;
}
}
}
if (active >= 0) {
ret = 1;
goto Exit;
}
if (up >= 0) {
ret = 0;
goto Exit;
}
ret = -1;
Exit:
release_ca(&ca);
return ret;
}
static int resolve_ca_name(const char *ca_in, int *best_port,
char **ca_name)
{
struct umad_device_node *device_list;
struct umad_device_node *node;
struct umad_device_node *phys_found = NULL;
const char *name_found;
int port_found = 0, port, port_type;
*ca_name = NULL;
if (ca_in && (!best_port || *best_port)) {
*ca_name = strdup(ca_in);
if (!(*ca_name))
return -1;
return 0;
}
if (ca_in) {
if (resolve_ca_port(ca_in, best_port) < 0)
return -1;
*ca_name = strdup(ca_in);
if (!(*ca_name))
return -1;
return 0;
}
/* Get the list of CA names */
device_list = umad_get_ca_device_list();
if (!device_list)
return -1;
/* Find the first existing CA with an active port */
for (node = device_list; node; node = node->next) {
name_found = node->ca_name;
TRACE("checking ca '%s'", name_found);
port = best_port ? *best_port : 0;
port_type = resolve_ca_port(name_found, &port);
if (port_type < 0)
continue;
DEBUG("found ca %s with port %d type %d",
name_found, port, port_type);
if (port_type > 0) {
if (best_port)
*best_port = port;
DEBUG("found ca %s with active port %d",
name_found, port);
*ca_name = strdup(name_found);
umad_free_ca_device_list(device_list);
if (!(*ca_name))
return -1;
return 0;
}
if (!phys_found) {
phys_found = node;
port_found = port;
}
}
DEBUG("phys found on %s port %d",
phys_found ? phys_found->ca_name : NULL,
port_found);
if (phys_found) {
name_found = phys_found->ca_name;
DEBUG("phys found on %s port %d",
phys_found ? name_found : NULL,
port_found);
if (best_port)
*best_port = port_found;
*ca_name = strdup(name_found);
umad_free_ca_device_list(device_list);
if (!(*ca_name))
return -1;
return 0;
}
umad_free_ca_device_list(device_list);
if (best_port)
*best_port = def_ca_port;
*ca_name = strdup(def_ca_name);
if (!(*ca_name))
return -1;
return 0;
}
static int get_ca(const char *ca_name, umad_ca_t * ca)
{
DIR *dir;
char dir_name[256];
struct dirent **namelist;
int r, i, ret;
int portnum;
ca->numports = 0;
memset(ca->ports, 0, sizeof ca->ports);
strncpy(ca->ca_name, ca_name, sizeof(ca->ca_name) - 1);
snprintf(dir_name, sizeof(dir_name), "%s/%s", SYS_INFINIBAND,
ca->ca_name);
if ((r = sys_read_uint(dir_name, SYS_NODE_TYPE, &ca->node_type)) < 0)
return r;
if (sys_read_string(dir_name, SYS_CA_FW_VERS, ca->fw_ver,
sizeof ca->fw_ver) < 0)
ca->fw_ver[0] = '\0';
if (sys_read_string(dir_name, SYS_CA_HW_VERS, ca->hw_ver,
sizeof ca->hw_ver) < 0)
ca->hw_ver[0] = '\0';
if ((r = sys_read_string(dir_name, SYS_CA_TYPE, ca->ca_type,
sizeof ca->ca_type)) < 0)
ca->ca_type[0] = '\0';
if ((r = sys_read_guid(dir_name, SYS_CA_NODE_GUID, &ca->node_guid)) < 0)
return r;
if ((r =
sys_read_guid(dir_name, SYS_CA_SYS_GUID, &ca->system_guid)) < 0)
return r;
snprintf(dir_name, sizeof(dir_name), "%s/%s/%s",
SYS_INFINIBAND, ca->ca_name, SYS_CA_PORTS_DIR);
if (!(dir = opendir(dir_name)))
return -ENOENT;
if ((r = scandir(dir_name, &namelist, NULL, alphasort)) < 0) {
ret = errno < 0 ? errno : -EIO;
goto error;
}
ret = 0;
for (i = 0; i < r; i++) {
portnum = 0;
if (!strcmp(".", namelist[i]->d_name) ||
!strcmp("..", namelist[i]->d_name))
continue;
if (strcmp("0", namelist[i]->d_name) &&
((portnum = atoi(namelist[i]->d_name)) <= 0 ||
portnum >= UMAD_CA_MAX_PORTS)) {
ret = -EIO;
goto clean;
}
if (!(ca->ports[portnum] =
calloc(1, sizeof(*ca->ports[portnum])))) {
ret = -ENOMEM;
goto clean;
}
if (get_port(ca_name, dir_name, portnum, ca->ports[portnum]) <
0) {
free(ca->ports[portnum]);
ca->ports[portnum] = NULL;
ret = -EIO;
goto clean;
}
if (ca->numports < portnum)
ca->numports = portnum;
}
for (i = 0; i < r; i++)
free(namelist[i]);
free(namelist);
closedir(dir);
put_ca(ca);
return 0;
clean:
for (i = 0; i < r; i++)
free(namelist[i]);
free(namelist);
error:
closedir(dir);
release_ca(ca);
return ret;
}
static int umad_id_to_dev(int umad_id, char *dev, unsigned *port)
{
char path[256];
int r;
snprintf(path, sizeof(path), SYS_INFINIBAND_MAD "/umad%d/", umad_id);
if ((r =
sys_read_string(path, SYS_IB_MAD_DEV, dev, UMAD_CA_NAME_LEN)) < 0)
return r;
if ((r = sys_read_uint(path, SYS_IB_MAD_PORT, port)) < 0)
return r;
return 0;
}
static int dev_to_umad_id(const char *dev, unsigned port)
{
char umad_dev[UMAD_CA_NAME_LEN];
unsigned umad_port;
int id;
for (id = 0; id < UMAD_MAX_PORTS; id++) {
if (umad_id_to_dev(id, umad_dev, &umad_port) < 0)
continue;
if (strncmp(dev, umad_dev, UMAD_CA_NAME_LEN))
continue;
if (port != umad_port)
continue;
DEBUG("mapped %s %d to %d", dev, port, id);
return id;
}
return -1; /* not found */
}
/*******************************
* Public interface
*/
int umad_init(void)
{
TRACE("umad_init");
return 0;
}
int umad_done(void)
{
TRACE("umad_done");
/* FIXME - verify that all ports are closed */
return 0;
}
static unsigned is_ib_type(const char *ca_name)
{
char dir_name[256];
unsigned type;
snprintf(dir_name, sizeof(dir_name), "%s/%s", SYS_INFINIBAND, ca_name);
if (sys_read_uint(dir_name, SYS_NODE_TYPE, &type) < 0)
return 0;
return type >= 1 && type <= 3 ? 1 : 0;
}
int umad_get_cas_names(char cas[][UMAD_CA_NAME_LEN], int max)
{
struct dirent **namelist;
int n, i, j = 0;
TRACE("max %d", max);
n = scandir(SYS_INFINIBAND, &namelist, NULL, alphasort);
if (n > 0) {
for (i = 0; i < n; i++) {
if (strcmp(namelist[i]->d_name, ".") &&
strcmp(namelist[i]->d_name, "..") &&
strlen(namelist[i]->d_name) < UMAD_CA_NAME_LEN) {
if (j < max && is_ib_type(namelist[i]->d_name))
strcpy(cas[j++], namelist[i]->d_name);
}
free(namelist[i]);
}
DEBUG("return %d cas", j);
} else {
/* Is this still needed ? */
strncpy((char *)cas, def_ca_name, UMAD_CA_NAME_LEN);
DEBUG("return 1 ca");
j = 1;
}
if (n >= 0)
free(namelist);
return j;
}
int umad_get_ca_portguids(const char *ca_name, __be64 *portguids, int max)
{
umad_ca_t ca;
int ports = 0, i, result;
char *found_ca_name;
TRACE("ca name %s max port guids %d", ca_name, max);
if (resolve_ca_name(ca_name, NULL, &found_ca_name) < 0) {
result = -ENODEV;
goto exit;
}
if (umad_get_ca(found_ca_name, &ca) < 0) {
result = -1;
goto exit;
}
if (portguids) {
if (ca.numports + 1 > max) {
result = -ENOMEM;
goto clean;
}
for (i = 0; i <= ca.numports; i++)
portguids[ports++] = ca.ports[i] ?
ca.ports[i]->port_guid : htobe64(0);
}
DEBUG("%s: %d ports", found_ca_name, ports);
result = ports;
clean:
release_ca(&ca);
exit:
free(found_ca_name);
return result;
}
int umad_get_issm_path(const char *ca_name, int portnum, char path[], int max)
{
int umad_id, result;
char *found_ca_name;
TRACE("ca %s port %d", ca_name, portnum);
if (resolve_ca_name(ca_name, &portnum, &found_ca_name) < 0) {
result = -ENODEV;
goto exit;
}
umad_id = dev_to_umad_id(found_ca_name, portnum);
if (umad_id < 0) {
result = -EINVAL;
goto exit;
}
snprintf(path, max, "%s/issm%u", RDMA_CDEV_DIR, umad_id);
result = 0;
exit:
free(found_ca_name);
return result;
}
int umad_open_port(const char *ca_name, int portnum)
{
char dev_file[UMAD_DEV_FILE_SZ];
int umad_id, fd, result;
unsigned int abi_version = get_abi_version();
char *found_ca_name = NULL;
TRACE("ca %s port %d", ca_name, portnum);
if (!abi_version) {
result = -EOPNOTSUPP;
goto exit;
}
if (resolve_ca_name(ca_name, &portnum, &found_ca_name) < 0) {
result = -ENODEV;
goto exit;
}
DEBUG("opening %s port %d", found_ca_name, portnum);
umad_id = dev_to_umad_id(found_ca_name, portnum);
if (umad_id < 0) {
result = -EINVAL;
goto exit;
}
snprintf(dev_file, sizeof(dev_file), "%s/umad%d",
RDMA_CDEV_DIR, umad_id);
if ((fd = open(dev_file, O_RDWR | O_NONBLOCK)) < 0) {
DEBUG("open %s failed: %s", dev_file, strerror(errno));
result = -EIO;
goto exit;
}
if (abi_version > 5 || !ioctl(fd, IB_USER_MAD_ENABLE_PKEY, NULL))
new_user_mad_api = 1;
else
new_user_mad_api = 0;
DEBUG("opened %s fd %d portid %d", dev_file, fd, umad_id);
result = fd;
exit:
free(found_ca_name);
return result;
}
int umad_get_ca(const char *ca_name, umad_ca_t *ca)
{
int r = 0;
char *found_ca_name;
TRACE("ca_name %s", ca_name);
if (resolve_ca_name(ca_name, NULL, &found_ca_name) < 0) {
r = -ENODEV;
goto exit;
}
if (find_cached_ca(found_ca_name, ca) > 0)
goto exit;
r = get_ca(found_ca_name, ca);
if (r < 0)
goto exit;
DEBUG("opened %s", found_ca_name);
exit:
free(found_ca_name);
return r;
}
int umad_release_ca(umad_ca_t * ca)
{
int r;
TRACE("ca_name %s", ca->ca_name);
if (!ca)
return -ENODEV;
if ((r = release_ca(ca)) < 0)
return r;
DEBUG("releasing %s", ca->ca_name);
return 0;
}
int umad_get_port(const char *ca_name, int portnum, umad_port_t *port)
{
char dir_name[256];
char *found_ca_name;
int result;
TRACE("ca_name %s portnum %d", ca_name, portnum);
if (resolve_ca_name(ca_name, &portnum, &found_ca_name) < 0) {
result = -ENODEV;
goto exit;
}
snprintf(dir_name, sizeof(dir_name), "%s/%s/%s",
SYS_INFINIBAND, found_ca_name, SYS_CA_PORTS_DIR);
result = get_port(found_ca_name, dir_name, portnum, port);
exit:
free(found_ca_name);
return result;
}
int umad_release_port(umad_port_t * port)
{
int r;
TRACE("port %s:%d", port->ca_name, port->portnum);
if (!port)
return -ENODEV;
if ((r = release_port(port)) < 0)
return r;
DEBUG("releasing %s:%d", port->ca_name, port->portnum);
return 0;
}
int umad_close_port(int fd)
{
close(fd);
DEBUG("closed fd %d", fd);
return 0;
}
void *umad_get_mad(void *umad)
{
return new_user_mad_api ? ((struct ib_user_mad *)umad)->data :
(void *)&((struct ib_user_mad *)umad)->addr.pkey_index;
}
size_t umad_size(void)
{
return new_user_mad_api ? sizeof(struct ib_user_mad) :
sizeof(struct ib_user_mad) - 8;
}
int umad_set_grh(void *umad, void *mad_addr)
{
struct ib_user_mad *mad = umad;
struct ib_mad_addr *addr = mad_addr;
if (mad_addr) {
mad->addr.grh_present = 1;
mad->addr.ib_gid = addr->ib_gid;
/* The definition for umad_set_grh requires that the input be
* in host order */
mad->addr.flow_label = htobe32((__force uint32_t)addr->flow_label);
mad->addr.hop_limit = addr->hop_limit;
mad->addr.traffic_class = addr->traffic_class;
} else
mad->addr.grh_present = 0;
return 0;
}
int umad_set_pkey(void *umad, int pkey_index)
{
struct ib_user_mad *mad = umad;
if (new_user_mad_api)
mad->addr.pkey_index = pkey_index;
return 0;
}
int umad_get_pkey(void *umad)
{
struct ib_user_mad *mad = umad;
if (new_user_mad_api)
return mad->addr.pkey_index;
return 0;
}
int umad_set_addr(void *umad, int dlid, int dqp, int sl, int qkey)
{
struct ib_user_mad *mad = umad;
TRACE("umad %p dlid %u dqp %d sl %d, qkey %x",
umad, dlid, dqp, sl, qkey);
mad->addr.qpn = htobe32(dqp);
mad->addr.lid = htobe16(dlid);
mad->addr.qkey = htobe32(qkey);
mad->addr.sl = sl;
return 0;
}
int umad_set_addr_net(void *umad, __be16 dlid, __be32 dqp, int sl, __be32 qkey)
{
struct ib_user_mad *mad = umad;
TRACE("umad %p dlid %u dqp %d sl %d qkey %x",
umad, be16toh(dlid), be32toh(dqp), sl, be32toh(qkey));
mad->addr.qpn = dqp;
mad->addr.lid = dlid;
mad->addr.qkey = qkey;
mad->addr.sl = sl;
return 0;
}
int umad_send(int fd, int agentid, void *umad, int length,
int timeout_ms, int retries)
{
struct ib_user_mad *mad = umad;
int n;
TRACE("fd %d agentid %d umad %p timeout %u",
fd, agentid, umad, timeout_ms);
errno = 0;
mad->timeout_ms = timeout_ms;
mad->retries = retries;
mad->agent_id = agentid;
if (umaddebug > 1)
umad_dump(mad);
n = write(fd, mad, length + umad_size());
if (n == length + umad_size())
return 0;
DEBUG("write returned %d != sizeof umad %zu + length %d (%m)",
n, umad_size(), length);
if (!errno)
errno = EIO;
return -EIO;
}
static int dev_poll(int fd, int timeout_ms)
{
struct pollfd ufds;
int n;
ufds.fd = fd;
ufds.events = POLLIN;
if ((n = poll(&ufds, 1, timeout_ms)) == 1)
return 0;
if (n == 0)
return -ETIMEDOUT;
return -EIO;
}
int umad_recv(int fd, void *umad, int *length, int timeout_ms)
{
struct ib_user_mad *mad = umad;
int n;
errno = 0;
TRACE("fd %d umad %p timeout %u", fd, umad, timeout_ms);
if (!umad || !length) {
errno = EINVAL;
return -EINVAL;
}
if (timeout_ms && (n = dev_poll(fd, timeout_ms)) < 0) {
if (!errno)
errno = -n;
return n;
}
n = read(fd, umad, umad_size() + *length);
VALGRIND_MAKE_MEM_DEFINED(umad, umad_size() + *length);
if ((n >= 0) && (n <= umad_size() + *length)) {
DEBUG("mad received by agent %d length %d", mad->agent_id, n);
if (n > umad_size())
*length = n - umad_size();
else
*length = 0;
return mad->agent_id;
}
if (n == -EWOULDBLOCK) {
if (!errno)
errno = EWOULDBLOCK;
return n;
}
DEBUG("read returned %zu > sizeof umad %zu + length %d (%m)",
mad->length - umad_size(), umad_size(), *length);
*length = mad->length - umad_size();
if (!errno)
errno = EIO;
return -errno;
}
int umad_poll(int fd, int timeout_ms)
{
TRACE("fd %d timeout %u", fd, timeout_ms);
return dev_poll(fd, timeout_ms);
}
int umad_get_fd(int fd)
{
TRACE("fd %d", fd);
return fd;
}
int umad_register_oui(int fd, int mgmt_class, uint8_t rmpp_version,
uint8_t oui[3], long method_mask[])
{
struct ib_user_mad_reg_req req;