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psm_utils.c
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/*
* Copyright (c) 2013. Intel Corporation. All rights reserved.
* Copyright (c) 2006-2012. QLogic Corporation. All rights reserved.
* Copyright (c) 2003-2006, PathScale, Inc. 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 <netdb.h> /* gethostbyname */
#include "psm_user.h"
#include "psm_mq_internal.h"
int psmi_ep_device_is_enabled(const psm_ep_t ep, int devid);
struct psmi_epid_table psmi_epid_table;
/* Iterator to access the epid table.
* 'ep' can be NULL if remote endpoints from all endpoint handles are requested
*/
void
psmi_epid_itor_init(struct psmi_eptab_iterator *itor, psm_ep_t ep)
{
itor->i = 0;
itor->ep = ep;
pthread_mutex_lock(&psmi_epid_table.tablock);
}
void *
psmi_epid_itor_next(struct psmi_eptab_iterator *itor)
{
int i;
struct psmi_epid_tabentry *e;
if (itor->i >= psmi_epid_table.tabsize)
return NULL;
for (i = itor->i; i < psmi_epid_table.tabsize; i++) {
e = &psmi_epid_table.table[i];
if (!e->entry || e->entry == EPADDR_DELETED)
continue;
if (itor->ep && e->ep != itor->ep)
continue;
itor->i = i+1;
return e->entry;
}
itor->i = psmi_epid_table.tabsize; /* put at end of table */
return NULL;
}
void
psmi_epid_itor_fini(struct psmi_eptab_iterator *itor)
{
pthread_mutex_unlock(&psmi_epid_table.tablock);
itor->i = 0;
}
#define mix64(a,b,c) \
{ \
a -= b; a -= c; a ^= (c>>43); \
b -= c; b -= a; b ^= (a<<9); \
c -= a; c -= b; c ^= (b>>8); \
a -= b; a -= c; a ^= (c>>38); \
b -= c; b -= a; b ^= (a<<23); \
c -= a; c -= b; c ^= (b>>5); \
a -= b; a -= c; a ^= (c>>35); \
b -= c; b -= a; b ^= (a<<49); \
c -= a; c -= b; c ^= (b>>11); \
a -= b; a -= c; a ^= (c>>12); \
b -= c; b -= a; b ^= (a<<18); \
c -= a; c -= b; c ^= (b>>22); \
}
psm_error_t
psmi_epid_init()
{
pthread_mutexattr_t attr;
psmi_epid_table.table = NULL,
psmi_epid_table.tabsize = 0;
psmi_epid_table.tabsize_used = 0;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&psmi_epid_table.tablock, &attr);
pthread_mutexattr_destroy(&attr);
return PSM_OK;
};
psm_error_t
psmi_epid_fini()
{
if (psmi_epid_table.table != NULL) {
psmi_free(psmi_epid_table.table);
psmi_epid_table.table = NULL;
}
psmi_epid_table.tabsize = 0;
psmi_epid_table.tabsize_used = 0;
return PSM_OK;
}
PSMI_ALWAYS_INLINE(
uint64_t
hash_this(const psm_ep_t ep, const psm_epid_t epid))
{
uint64_t ep_i = (uint64_t)(uintptr_t)ep;
uint64_t epid_i = (uint64_t) epid;
uint64_t hash = 0x9e3779b97f4a7c13LL;
mix64(ep_i,epid_i,hash);
return hash;
}
PSMI_ALWAYS_INLINE(
void *
psmi_epid_lookup_inner(psm_ep_t ep, psm_epid_t epid, int remove))
{
uint64_t key = hash_this(ep, epid);
struct psmi_epid_tabentry *e;
void *entry = NULL;
int idx;
pthread_mutex_lock(&psmi_epid_table.tablock);
if (!psmi_epid_table.table)
goto ret;
idx = (int)(key % psmi_epid_table.tabsize);
while (psmi_epid_table.table[idx].entry != NULL) {
/* An epid can be added twice if there's more than one opened endpoint,
* but really we match on epid *and* on endpoint */
e = &psmi_epid_table.table[idx];
if (e->entry != EPADDR_DELETED && e->key == key)
{
entry = e->entry;
if (remove)
psmi_epid_table.table[idx].entry = EPADDR_DELETED;
goto ret;
}
if (++idx == psmi_epid_table.tabsize)
idx = 0;
}
ret:
pthread_mutex_unlock(&psmi_epid_table.tablock);
return entry;
}
void *
psmi_epid_lookup(psm_ep_t ep, psm_epid_t epid)
{
void *entry = psmi_epid_lookup_inner(ep, epid, 0);
if (PSMI_EP_HOSTNAME != ep)
_IPATH_VDBG("lookup of (%p,%" PRIx64 ") returns %p\n", ep, epid, entry);
return entry;
}
void *
psmi_epid_remove(psm_ep_t ep, psm_epid_t epid)
{
if (PSMI_EP_HOSTNAME != ep)
_IPATH_VDBG("remove of (%p,%" PRIx64 ")\n", ep, epid);
return psmi_epid_lookup_inner(ep, epid, 1);
}
psm_error_t
psmi_epid_add(psm_ep_t ep, psm_epid_t epid, void *entry)
{
uint64_t key;
int idx, i, newsz;
struct psmi_epid_tabentry *e;
psm_error_t err = PSM_OK;
if (PSMI_EP_HOSTNAME != ep)
_IPATH_VDBG("add of (%p,%" PRIx64 ") with entry %p\n", ep, epid, entry);
pthread_mutex_lock(&psmi_epid_table.tablock);
/* Leave this here, mostly for sanity and for the fact that the epid
* table is currently not used in the critical path */
if (++psmi_epid_table.tabsize_used >
(int)(psmi_epid_table.tabsize * PSMI_EPID_TABLOAD_FACTOR))
{
struct psmi_epid_tabentry *newtab;
newsz = psmi_epid_table.tabsize + PSMI_EPID_TABSIZE_CHUNK;
newtab = (struct psmi_epid_tabentry *)
psmi_calloc(ep, PER_PEER_ENDPOINT,
newsz, sizeof(struct psmi_epid_tabentry));
if (newtab == NULL) {
err = PSM_NO_MEMORY;
goto fail;
}
if (psmi_epid_table.table) { /* rehash the table */
for (i = 0; i < psmi_epid_table.tabsize; i++) {
e = &psmi_epid_table.table[i];
if (e->entry == NULL)
continue;
/* When rehashing, mark deleted as free again */
if (e->entry == EPADDR_DELETED) {
psmi_epid_table.tabsize_used--;
continue;
}
idx = (int)(e->key % newsz);
while (newtab[idx].entry != NULL)
if (++idx == newsz)
idx = 0;
newtab[idx].entry = e->entry;
newtab[idx].key = e->key;
newtab[idx].ep = e->ep;
newtab[idx].epid = e->epid;
}
psmi_free(psmi_epid_table.table);
}
psmi_epid_table.table = newtab;
psmi_epid_table.tabsize = newsz;
}
key = hash_this(ep, epid);
idx = (int)(key % psmi_epid_table.tabsize);
e = &psmi_epid_table.table[idx];
while (e->entry && e->entry != EPADDR_DELETED) {
if (++idx == psmi_epid_table.tabsize)
idx = 0;
e = &psmi_epid_table.table[idx];
}
e->entry = entry;
e->key = key;
e->epid = epid;
e->ep = ep;
fail:
pthread_mutex_unlock(&psmi_epid_table.tablock);
return err;
}
char *
psmi_gethostname(void)
{
/* XXX this will need a lock in a multi-threaded environment */
static char hostname[80] = {'\0'};
char *c;
if (hostname[0] == '\0') {
gethostname(hostname, sizeof(hostname));
hostname[sizeof(hostname) - 1] = '\0'; /* no guarantee of nul termination */
if ((c = strchr(hostname, '.')))
*c = '\0';
}
return hostname;
}
/*
* Hostname stuff. We really only register the network portion of the epid
* since all epids from the same nid are assumed to have the same hostname.
*/
psm_error_t
psmi_epid_set_hostname(uint64_t nid, const char *hostname, int overwrite)
{
size_t hlen;
char *h;
psm_error_t err = PSM_OK;
if (hostname == NULL)
return PSM_OK;
/* First see if a hostname already exists */
if ((h = psmi_epid_lookup(PSMI_EP_HOSTNAME, nid)) != NULL) {
if (!overwrite)
return PSM_OK;
h = psmi_epid_remove(PSMI_EP_HOSTNAME, nid);
if (h != NULL) /* free the previous hostname if so exists */
psmi_free(h);
}
hlen = min(PSMI_EP_HOSTNAME_LEN, strlen(hostname)+1);
h = (char *) psmi_malloc(PSMI_EP_NONE, PER_PEER_ENDPOINT, hlen);
if (h == NULL)
return PSM_NO_MEMORY;
snprintf(h, hlen, "%s", hostname);
h[hlen-1] = '\0';
err = psmi_epid_add(PSMI_EP_HOSTNAME, nid, h);
return err;
}
/* XXX These two functions are not thread safe, we'll use a rotating buffer
* trick whenever we need to make them thread safe */
const char *
psmi_epaddr_get_hostname(psm_epid_t epid)
{
static char hostnamebufs[4][PSMI_EP_HOSTNAME_LEN];
static int bufno = 0;
uint64_t nid = psm_epid_nid(epid);
char *h, *hostname;
hostname = hostnamebufs[bufno];
bufno = (bufno + 1) % 4;
/* First, if we have registered a host for this epid, just return that, or
* else try to return something with lid and context */
h = psmi_epid_lookup(PSMI_EP_HOSTNAME, nid);
if (h != NULL)
return h;
else {
uint64_t lid, context, subcontext;
lid = PSMI_EPID_GET_LID(epid);
context = PSMI_EPID_GET_CONTEXT(epid);
subcontext = PSMI_EPID_GET_SUBCONTEXT(epid);
snprintf(hostname, PSMI_EP_HOSTNAME_LEN-1, "LID=0x%04x:%d.%d",
(unsigned int) lid, (int) context, (int) subcontext);
hostname[PSMI_EP_HOSTNAME_LEN-1] = '\0';
return hostname;
}
}
/* This one gives the hostname with a lid */
const char *
psmi_epaddr_get_name(psm_epid_t epid)
{
static char hostnamebufs[4][PSMI_EP_HOSTNAME_LEN];
static int bufno = 0;
char *h, *hostname;
uint64_t lid, context, subcontext;
lid = PSMI_EPID_GET_LID(epid);
context = PSMI_EPID_GET_CONTEXT(epid);
subcontext = PSMI_EPID_GET_SUBCONTEXT(epid);
hostname = hostnamebufs[bufno];
bufno = (bufno + 1) % 4;
h = psmi_epid_lookup(PSMI_EP_HOSTNAME, psm_epid_nid(epid));
if (h == NULL)
return psmi_epaddr_get_hostname(epid);
else {
snprintf(hostname, PSMI_EP_HOSTNAME_LEN-1,
"%s (LID=0x%04x:%d.%d)", h,
(unsigned int) lid, (int) context, (int) subcontext);
hostname[PSMI_EP_HOSTNAME_LEN-1] = '\0';
}
return hostname;
}
/* Wrapper, in case we port to OS xyz that doesn't have sysconf */
uintptr_t
psmi_getpagesize(void)
{
static uintptr_t pagesz = (uintptr_t) -1;
long sz;
if (pagesz != (uintptr_t) -1)
return pagesz;
sz = sysconf(_SC_PAGESIZE);
if (sz == -1) {
psmi_handle_error(PSMI_EP_NORETURN, PSM_INTERNAL_ERR,
"Can't query system page size");
}
pagesz = (uintptr_t) sz;
return pagesz;
}
/* If PSM_VERBOSE_ENV is set in the environment, we determine
* what its verbose level is and print the environment at "INFO"
* level if the environment's level matches the desired printlevel.
*/
static int psmi_getenv_verblevel = -1;
static int
psmi_getenv_is_verblevel(int printlevel)
{
if (psmi_getenv_verblevel == -1) {
char *env = getenv("PSM_VERBOSE_ENV");
if (env && *env) {
char *ep;
int val = (int) strtol(env, &ep, 0);
if (ep == env)
psmi_getenv_verblevel = 0;
else if (val == 2)
psmi_getenv_verblevel = 2;
else
psmi_getenv_verblevel = 1;
}
else
psmi_getenv_verblevel = 0;
}
return (printlevel <= psmi_getenv_verblevel);
}
#define GETENV_PRINTF(_level,_fmt,...) \
do { \
int nlevel = _level; \
if (psmi_getenv_is_verblevel(nlevel)) \
nlevel = 0; \
_IPATH_ENVDBG(nlevel,_fmt,##__VA_ARGS__); \
} while (0)
int
psmi_getenv(const char *name, const char *descr, int level,
int type, union psmi_envvar_val defval,
union psmi_envvar_val *newval)
{
int used_default = 0;
union psmi_envvar_val tval;
char *env = getenv(name);
int ishex = (type == PSMI_ENVVAR_TYPE_ULONG_FLAGS ||
type == PSMI_ENVVAR_TYPE_UINT_FLAGS);
/* If we're not using the default, always reset the print
* level to '1' so the changed value gets seen at low
* verbosity */
#define _GETENV_PRINT(used_default,fmt,val,defval) do { \
if (used_default) \
GETENV_PRINTF(level, "%s%-25s %-40s =>%s" #fmt \
"\n", level>1?"*":" ", name, descr, ishex?" \
0x":" ", val); \
else \
GETENV_PRINTF(1, "%s%-25s %-40s =>%s" #fmt \
" (default was%s" #fmt ")\n",level>1?"*":" ", \
name, descr, ishex?" 0x":" ", val, \
ishex?" 0x":" ", defval); \
} while (0)
switch (type) {
case PSMI_ENVVAR_TYPE_YESNO:
if (!env || *env == '\0') {
tval = defval;
used_default = 1;
}
else if (env[0] == 'Y' || env[0] == 'y')
tval.e_int = 1;
else if (env[0] == 'N' || env[0] == 'n')
tval.e_int = 0;
else {
char *ep;
tval.e_ulong = strtoul(env, &ep, 0);
if (ep == env) {
used_default = 1;
tval = defval;
}
else if (tval.e_ulong != 0)
tval.e_ulong = 1;
}
_GETENV_PRINT(used_default,%s,tval.e_long?"YES":"NO",
defval.e_int?"YES":"NO");
break;
case PSMI_ENVVAR_TYPE_STR:
if (!env || *env == '\0') {
tval = defval;
used_default = 1;
}
else
tval.e_str = env;
_GETENV_PRINT(used_default,%s,tval.e_str,defval.e_str);
break;
case PSMI_ENVVAR_TYPE_INT:
if (!env || *env == '\0') {
tval = defval;
used_default = 1;
}
else {
char *ep;
tval.e_int = (int) strtol(env, &ep, 0);
if (ep == env) {
used_default = 1;
tval = defval;
}
}
_GETENV_PRINT(used_default,%d,tval.e_int,defval.e_int);
break;
case PSMI_ENVVAR_TYPE_UINT:
case PSMI_ENVVAR_TYPE_UINT_FLAGS:
if (!env || *env == '\0') {
tval = defval;
used_default = 1;
}
else {
char *ep;
tval.e_int = (unsigned int) strtoul(env, &ep, 0);
if (ep == env) {
used_default = 1;
tval = defval;
}
}
if (type == PSMI_ENVVAR_TYPE_UINT_FLAGS)
_GETENV_PRINT(used_default,%x,tval.e_uint,defval.e_uint);
else
_GETENV_PRINT(used_default,%u,tval.e_uint,defval.e_uint);
break;
case PSMI_ENVVAR_TYPE_LONG:
if (!env || *env == '\0') {
tval = defval;
used_default = 1;
}
else {
char *ep;
tval.e_long = strtol(env, &ep, 0);
if (ep == env) {
used_default = 1;
tval = defval;
}
}
_GETENV_PRINT(used_default,%ld,tval.e_long,defval.e_long);
break;
case PSMI_ENVVAR_TYPE_ULONG_ULONG:
if (!env || *env == '\0') {
tval = defval;
used_default = 1;
}
else {
char *ep;
tval.e_ulonglong = (unsigned long long) strtoull(env, &ep, 0);
if (ep == env) {
used_default = 1;
tval = defval;
}
}
_GETENV_PRINT(used_default,%llu,
tval.e_ulonglong, defval.e_ulonglong);
break;
case PSMI_ENVVAR_TYPE_ULONG:
case PSMI_ENVVAR_TYPE_ULONG_FLAGS:
default:
if (!env || *env == '\0') {
tval = defval;
used_default = 1;
}
else {
char *ep;
tval.e_ulong = (unsigned long) strtoul(env, &ep, 0);
if (ep == env) {
used_default = 1;
tval = defval;
}
}
if (type == PSMI_ENVVAR_TYPE_ULONG_FLAGS)
_GETENV_PRINT(used_default,%lx,tval.e_ulong,defval.e_ulong);
else
_GETENV_PRINT(used_default,%lu,tval.e_ulong,defval.e_ulong);
break;
}
#undef _GETENV_PRINT
*newval = tval;
return used_default;
}
/*
* Parsing int parameters set in string tuples.
* Output array int *vals should be able to store 'ntup' elements.
* Values are only overwritten if they are parsed.
* Tuples are always separated by colons ':'
*/
int psmi_parse_str_tuples(const char *string, int ntup, int *vals)
{
char *b = (char *) string;
char *e = b;
int tup_i = 0;
int n_parsed = 0;
char *buf = psmi_strdup(NULL, string);
psmi_assert_always(buf != NULL);
while (*e && tup_i < ntup) {
b = e;
while (*e && *e != ':')
e++;
if (e > b) { /* something to parse */
char *ep;
int len = e - b;
long int l;
strncpy(buf, b, len);
buf[len] = '\0';
l = strtol(buf, &ep, 0);
if (ep != buf) { /* successful conversion */
vals[tup_i] = (int) l;
n_parsed++;
}
}
if (*e == ':')
e++; /* skip delimiter */
tup_i++;
}
psmi_free(buf);
return n_parsed;
}
/*
* Memory footprint/usage mode.
*
* This can be used for debug or for separating large installations from
* small/medium ones. The default is to assume a medium installation. Large
* is not that much larger in memory footprint, but we make a conscious effort
* an consuming only the amount of memory we need.
*/
int
psmi_parse_memmode(void)
{
union psmi_envvar_val env_mmode;
int used_default =
psmi_getenv("PSM_MEMORY", "Memory usage mode (normal or large)",
PSMI_ENVVAR_LEVEL_USER, PSMI_ENVVAR_TYPE_STR,
(union psmi_envvar_val) "normal", &env_mmode);
if (used_default || !strcasecmp(env_mmode.e_str, "normal"))
return PSMI_MEMMODE_NORMAL;
else if (!strcasecmp(env_mmode.e_str, "min"))
return PSMI_MEMMODE_MINIMAL;
else if (!strcasecmp(env_mmode.e_str, "large") ||
!strcasecmp(env_mmode.e_str, "big"))
return PSMI_MEMMODE_LARGE;
else {
_IPATH_PRDBG("PSM_MEMORY env value %s unrecognized, "
"using 'normal' memory mode instead\n",
env_mmode.e_str);
return PSMI_MEMMODE_NORMAL;
}
}
static
const char *
psmi_memmode_string(int mode)
{
psmi_assert(mode >= PSMI_MEMMODE_NORMAL && mode < PSMI_MEMMODE_NUM);
switch (mode) {
case PSMI_MEMMODE_NORMAL:
return "normal";
case PSMI_MEMMODE_MINIMAL:
return "minimal";
case PSMI_MEMMODE_LARGE:
return "large";
default:
return "unknown";
}
}
psm_error_t
psmi_parse_mpool_env(const psm_mq_t mq, int level,
const struct psmi_rlimit_mpool *rlim,
uint32_t *valo, uint32_t *chunkszo)
{
uint32_t val;
const char *env = rlim->env;
int mode = mq->memmode;
psm_error_t err = PSM_OK;
union psmi_envvar_val env_val;
psmi_assert_always(mode >= PSMI_MEMMODE_NORMAL && mode < PSMI_MEMMODE_NUM);
psmi_getenv(rlim->env, rlim->descr, rlim->env_level,
PSMI_ENVVAR_TYPE_UINT,
(union psmi_envvar_val) rlim->mode[mode].obj_max,
&env_val);
val = env_val.e_uint;
if (val < rlim->minval || val > rlim->maxval)
{
err = psmi_handle_error(NULL, PSM_PARAM_ERR,
"Env. var %s=%u is invalid (valid settings in mode PSM_MEMORY=%s"
" are inclusively between %u and %u)", env, val,
psmi_memmode_string(mode), rlim->minval, rlim->maxval);
goto fail;
}
_IPATH_VDBG("%s max=%u,chunk=%u (mode=%s(%u),min=%u,max=%u)\n",
env, val, rlim->mode[mode].obj_chunk, psmi_memmode_string(mode),
mode, rlim->minval, rlim->maxval);
*valo = val;
*chunkszo = rlim->mode[mode].obj_chunk;
fail:
return err;
}
uint64_t
psmi_cycles_left(uint64_t start_cycles, int64_t timeout_ns)
{
if (timeout_ns < 0)
return 0ULL;
else if (timeout_ns == 0ULL || timeout_ns == ~0ULL)
return ~0ULL;
else {
uint64_t t_end = nanosecs_to_cycles(timeout_ns);
uint64_t t_now = get_cycles() - start_cycles;
if (t_now >= t_end)
return 0ULL;
else
return (t_end - t_now);
}
}
uint32_t
psmi_get_ipv4addr()
{
struct hostent *he;
uint32_t addr = 0;
he = gethostbyname(psmi_gethostname());
if (he != NULL && he->h_addrtype == AF_INET && he->h_addr != NULL) {
memcpy(&addr, he->h_addr, sizeof(uint32_t));
return addr;
}
else
return 0;
}
#define PSMI_EP_IS_PTR(ptr) ((ptr) != NULL && (ptr) < PSMI_EP_LOGEVENT)
void
psmi_syslog(psm_ep_t ep, int to_console, int level, const char *format, ...)
{
va_list ap;
/* If we've never syslogged anything from this ep at the PSM level, make
* sure we log context information */
if (PSMI_EP_IS_PTR(ep) && !ep->did_syslog) {
char uuid_str[64];
ep->did_syslog = 1;
memset(&uuid_str, 0, sizeof uuid_str);
psmi_uuid_unparse(ep->key, uuid_str);
ipath_syslog("PSM", 0, LOG_WARNING,
"uuid_key=%s,unit=%d,context=%d,subcontext=%d",
uuid_str,
ep->context.base_info.spi_unit,
ep->context.base_info.spi_context,
ep->context.base_info.spi_subcontext);
}
va_start(ap, format);
ipath_vsyslog("PSM", to_console, level, format, ap);
va_end(ap);
}
/* Table of CRCs of all 8-bit messages. */
static uint32_t crc_table[256];
/* Flag: has the table been computed? Initially false. */
static int crc_table_computed = 0;
/* Make the table for a fast CRC. */
static void make_crc_table(void)
{
uint32_t c;
int n, k;
for (n = 0; n < 256; n++) {
c = (uint32_t) n;
for (k = 0; k < 8; k++) {
if (c & 1)
c = 0xedb88320 ^ (c >> 1);
else
c = c >> 1;
}
crc_table[n] = c;
}
crc_table_computed = 1;
}
/* Update a running CRC with the bytes buf[0..len-1]--the CRC
* should be initialized to all 1's, and the transmitted value
* is the 1's complement of the final running CRC (see the
* crc() routine below)).
*/
static uint32_t update_crc(uint32_t crc, unsigned char *buf, int len)
{
uint32_t c = crc;
int n;
if_pf (!crc_table_computed)
make_crc_table();
for (n = 0; n < len; n++) {
c = crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8);
}
return c;
}
/* Return the CRC of the bytes buf[0..len-1]. */
uint32_t psmi_crc(unsigned char *buf, int len)
{
return update_crc(0xffffffff, buf, len) ^ 0xffffffff;
}
/* Return the HCA type being used for a context */
uint32_t psmi_get_hca_type(psmi_context_t *context)
{
uint32_t hca_type;
/* Determine HCA type. Use heuristics based on runtime flags
*
* Header suppression available: QLE73XX
* NODMA_RTAIL: QLE72XX
* <AnythingElse>: QLE71XX
*/
if (context->runtime_flags & IPATH_RUNTIME_HDRSUPP)
hca_type = PSMI_HCA_TYPE_QLE73XX;
else if (context->runtime_flags & IPATH_RUNTIME_NODMA_RTAIL)
hca_type = PSMI_HCA_TYPE_QLE72XX;
else
hca_type = PSMI_HCA_TYPE_QLE71XX;
return hca_type;
}
#define PSMI_FAULTINJ_SPEC_NAMELEN 32
struct psmi_faultinj_spec {
STAILQ_ENTRY(psmi_faultinj_spec) next;
char spec_name[PSMI_FAULTINJ_SPEC_NAMELEN];
unsigned long long num_faults;
unsigned long long num_calls;
unsigned int seedp;
int num;
int denom;
};
int psmi_faultinj_enabled = 0;
int psmi_faultinj_verbose = 0;
char *psmi_faultinj_outfile = NULL;
static struct psmi_faultinj_spec psmi_faultinj_dummy;
static STAILQ_HEAD(, psmi_faultinj_spec) psmi_faultinj_head =
STAILQ_HEAD_INITIALIZER(psmi_faultinj_head);
void
psmi_faultinj_init()
{
union psmi_envvar_val env_fi;
psmi_getenv("PSM_FI", "PSM Fault Injection (yes/no)",
PSMI_ENVVAR_LEVEL_HIDDEN, PSMI_ENVVAR_TYPE_YESNO,
PSMI_ENVVAR_VAL_NO, &env_fi);
psmi_faultinj_enabled = !!env_fi.e_uint;
if (psmi_faultinj_enabled) {
char *def = NULL;
if (!psmi_getenv("PSM_FI_TRACEFILE", "PSM Fault Injection output file",
PSMI_ENVVAR_LEVEL_HIDDEN, PSMI_ENVVAR_TYPE_STR,
(union psmi_envvar_val) def, &env_fi))
{
psmi_faultinj_outfile = psmi_strdup(NULL, env_fi.e_str);
}
}
return;
}
void
psmi_faultinj_fini()
{
struct psmi_faultinj_spec *fi;
FILE *fp;
int do_fclose = 0;
if (!psmi_faultinj_enabled || psmi_faultinj_outfile == NULL)
return;
if (strncmp(psmi_faultinj_outfile, "stdout", 7) == 0)
fp = stdout;
else if (strncmp(psmi_faultinj_outfile, "stderr", 7) == 0)
fp = stderr;
else {
char *c = psmi_faultinj_outfile;
char buf[192];
int append = 0;
if (*c == '+') {
append = 1;
++c;
}
do_fclose = 1;
snprintf(buf, sizeof buf - 1, "%s.%s", c, __ipath_mylabel);
buf[sizeof buf - 1] = '\0';
fp = fopen(buf, append ? "a" : "w");
}
if (fp != NULL) {
STAILQ_FOREACH(fi, &psmi_faultinj_head, next) {
fprintf(fp, "%s:%s PSM_FI_%-12s %2.3f%% => "
"%2.3f%% %10lld faults/%10lld events\n", __progname,
__ipath_mylabel, fi->spec_name,
(double) fi->num * 100.0 / fi->denom,
(double) fi->num_faults * 100.0 / fi->num_calls,
fi->num_faults, fi->num_calls);
}
fflush(fp);
if (do_fclose)
fclose(fp);
}
psmi_free(psmi_faultinj_outfile);
return;
}
/*
* Intended to be used only once, not in the critical path
*/
struct psmi_faultinj_spec *
psmi_faultinj_getspec(char *spec_name, int num, int denom)
{
struct psmi_faultinj_spec *fi;
if (!psmi_faultinj_enabled)
return &psmi_faultinj_dummy;
STAILQ_FOREACH(fi, &psmi_faultinj_head, next) {
if (strcmp(fi->spec_name, spec_name) == 0)
return fi;
}
/* We got here, so no spec -- allocate one */
fi = psmi_malloc(PSMI_EP_NONE, UNDEFINED, sizeof(struct psmi_faultinj_spec));
strncpy(fi->spec_name, spec_name, PSMI_FAULTINJ_SPEC_NAMELEN-1);
fi->spec_name[PSMI_FAULTINJ_SPEC_NAMELEN-1] = '\0';
fi->num = num;
fi->denom = denom;
fi->num_faults = 0;
fi->num_calls = 0;
/*
* See if we get a hint from the environment.
* Format is
* <num:denom:initial_seed>
*
* By default, we chose the initial seed to be the 'pid'. If users need
* repeatability, they should set initial_seed to be the 'pid' when the
* error was observed or force the initial_seed to be a constant number in
* each running process. Using 'pid' is useful because core dumps store
* pids and our backtrace format does as well so if a crash is observed for
* a specific seed, programs can reuse the 'pid' to regenerate the same
* error condition.
*/
{
int fvals[3] = { num, denom, (int) getpid() };
union psmi_envvar_val env_fi;
char fvals_str[128];
char fname[128];
char fdesc[256];
snprintf(fvals_str, sizeof fvals_str - 1, "%d:%d:1", num, denom);
fvals_str[sizeof fvals_str - 1] = '\0';
snprintf(fname, sizeof fname - 1, "PSM_FI_%s", spec_name);
fname[sizeof fname - 1] = '\0';
snprintf(fdesc, sizeof fdesc - 1, "Fault Injection %s <%s>",
fname, fvals_str);
if (!psmi_getenv(fname, fdesc, PSMI_ENVVAR_LEVEL_HIDDEN,
PSMI_ENVVAR_TYPE_STR, (union psmi_envvar_val) fvals_str,
&env_fi))
{
/* not using default values */
int n_parsed = psmi_parse_str_tuples(env_fi.e_str, 3, fvals);
if (n_parsed >= 1)
fi->num = fvals[0];
if (n_parsed >= 2)
fi->denom = fvals[1];
if (n_parsed >= 3)
fi->seedp = fvals[2];
}
}
STAILQ_INSERT_TAIL(&psmi_faultinj_head, fi, next);
return fi;
}
int
psmi_faultinj_is_fault(struct psmi_faultinj_spec *fi)
{
int r;
if (!psmi_faultinj_enabled) /* never fault if disabled */
return 0;
if (fi->num == 0)
return 0;
fi->num_calls++;
r = rand_r(&fi->seedp);
if (r % fi->denom <= fi->num) {
fi->num_faults++;
return 1;
}