/home/bhubbard/working/src/ceph/src/spdk/dpdk/lib/librte_hash/rte_cuckoo

Bug Summary

File:	home/bhubbard/working/src/ceph/src/spdk/dpdk/lib/librte_hash/rte_cuckoo_hash.c
Warning:	line 631, column 27 Access to field 'len' results in a dereference of a null pointer (loaded from variable 'cached_free_slots')

Annotated Source Code

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/* SPDX-License-Identifier: BSD-3-Clause

#include <string.h>

#include <stdint.h>

#include <errno(*__errno_location ()).h>

#include <stdio.h>

#include <stdarg.h>

#include <sys/queue.h>

#include <rte_common.h>

#include <rte_memory.h> /* for definition of RTE_CACHE_LINE_SIZE */

#include <rte_log.h>

#include <rte_prefetch.h>

#include <rte_branch_prediction.h>

#include <rte_malloc.h>

#include <rte_eal.h>

#include <rte_eal_memconfig.h>

#include <rte_per_lcore.h>

#include <rte_errno(per_lcore__rte_errno).h>

#include <rte_string_fns.h>

#include <rte_cpuflags.h>

#include <rte_rwlock.h>

#include <rte_spinlock.h>

#include <rte_ring.h>

#include <rte_compat.h>

#include <rte_vect.h>

#include "rte_hash.h"

#include "rte_cuckoo_hash.h"

#define FOR_EACH_BUCKET(CURRENT_BKT, START_BUCKET)for (CURRENT_BKT = START_BUCKET; CURRENT_BKT != ((void*)0); CURRENT_BKT
= CURRENT_BKT->next) \

for (CURRENT_BKT = START_BUCKET; \

CURRENT_BKT != NULL((void*)0); \

CURRENT_BKT = CURRENT_BKT->next)

TAILQ_HEAD(rte_hash_list, rte_tailq_entry)struct rte_hash_list { struct rte_tailq_entry *tqh_first; struct
rte_tailq_entry * *tqh_last; };

static struct rte_tailq_elem rte_hash_tailq = {

.name = "RTE_HASH",

};

EAL_REGISTER_TAILQ(rte_hash_tailq)static void __attribute__((constructor(65535), used)) tailqinitfn_rte_hash_tailq
(void) { if (rte_eal_tailq_register(&rte_hash_tailq) <
0) __rte_panic(__func__, "Cannot initialize tailq: %s\n" "%.0s"
, rte_hash_tailq.name, "dummy"); }

struct rte_hash *

rte_hash_find_existing(const char *name)

{

struct rte_hash *h = NULL((void*)0);

struct rte_tailq_entry *te;

struct rte_hash_list *hash_list;

hash_list = RTE_TAILQ_CAST(rte_hash_tailq.head, rte_hash_list)(struct rte_hash_list *)&(rte_hash_tailq.head)->tailq_head;

rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK(&rte_eal_get_configuration()->mem_config->qlock));

TAILQ_FOREACH(te, hash_list, next)for ((te) = ((hash_list)->tqh_first); (te); (te) = ((te)->
next.tqe_next)) {

h = (struct rte_hash *) te->data;

if (strncmp(name, h->name, RTE_HASH_NAMESIZE)(__extension__ (__builtin_constant_p (32) && ((__builtin_constant_p
(name) && strlen (name) < ((size_t) (32))) || (__builtin_constant_p
(h->name) && strlen (h->name) < ((size_t) (
32)))) ? __extension__ ({ size_t __s1_len, __s2_len; (__builtin_constant_p
(name) && __builtin_constant_p (h->name) &&
(__s1_len = __builtin_strlen (name), __s2_len = __builtin_strlen
(h->name), (!((size_t)(const void *)((name) + 1) - (size_t
)(const void *)(name) == 1) || __s1_len >= 4) && (
!((size_t)(const void *)((h->name) + 1) - (size_t)(const void
*)(h->name) == 1) || __s2_len >= 4)) ? __builtin_strcmp
(name, h->name) : (__builtin_constant_p (name) &&
((size_t)(const void *)((name) + 1) - (size_t)(const void *)
(name) == 1) && (__s1_len = __builtin_strlen (name), __s1_len
< 4) ? (__builtin_constant_p (h->name) && ((size_t
)(const void *)((h->name) + 1) - (size_t)(const void *)(h->
name) == 1) ? __builtin_strcmp (name, h->name) : (__extension__
({ const unsigned char *__s2 = (const unsigned char *) (const
char *) (h->name); int __result = (((const unsigned char *
) (const char *) (name))[0] - __s2[0]); if (__s1_len > 0 &&
__result == 0) { __result = (((const unsigned char *) (const
char *) (name))[1] - __s2[1]); if (__s1_len > 1 &&
__result == 0) { __result = (((const unsigned char *) (const
char *) (name))[2] - __s2[2]); if (__s1_len > 2 &&
__result == 0) __result = (((const unsigned char *) (const char
*) (name))[3] - __s2[3]); } } __result; }))) : (__builtin_constant_p
(h->name) && ((size_t)(const void *)((h->name)
+ 1) - (size_t)(const void *)(h->name) == 1) && (
__s2_len = __builtin_strlen (h->name), __s2_len < 4) ? (
__builtin_constant_p (name) && ((size_t)(const void *
)((name) + 1) - (size_t)(const void *)(name) == 1) ? __builtin_strcmp
(name, h->name) : (- (__extension__ ({ const unsigned char
*__s2 = (const unsigned char *) (const char *) (name); int __result
= (((const unsigned char *) (const char *) (h->name))[0] -
__s2[0]); if (__s2_len > 0 && __result == 0) { __result
= (((const unsigned char *) (const char *) (h->name))[1] -
__s2[1]); if (__s2_len > 1 && __result == 0) { __result
= (((const unsigned char *) (const char *) (h->name))[2] -
__s2[2]); if (__s2_len > 2 && __result == 0) __result
= (((const unsigned char *) (const char *) (h->name))[3] -
__s2[3]); } } __result; })))) : __builtin_strcmp (name, h->
name)))); }) : strncmp (name, h->name, 32))) == 0)

break;

}

rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK(&rte_eal_get_configuration()->mem_config->qlock));

if (te == NULL((void*)0)) {

rte_errno(per_lcore__rte_errno) = ENOENT2;

return NULL((void*)0);

}

return h;

}

static inline struct rte_hash_bucket *

rte_hash_get_last_bkt(struct rte_hash_bucket *lst_bkt)

{

while (lst_bkt->next != NULL((void*)0))

lst_bkt = lst_bkt->next;

return lst_bkt;

}

void rte_hash_set_cmp_func(struct rte_hash *h, rte_hash_cmp_eq_t func)

{

h->cmp_jump_table_idx = KEY_CUSTOM;

h->rte_hash_custom_cmp_eq = func;

}

static inline int

rte_hash_cmp_eq(const void *key1, const void *key2, const struct rte_hash *h)

{

if (h->cmp_jump_table_idx == KEY_CUSTOM)

return h->rte_hash_custom_cmp_eq(key1, key2, h->key_len);

else

return cmp_jump_table[h->cmp_jump_table_idx](key1, key2, h->key_len);

}

* We use higher 16 bits of hash as the signature value stored in table.

* We use the lower bits for the primary bucket

* location. Then we XOR primary bucket location and the signature

* to get the secondary bucket location. This is same as

* proposed in Bin Fan, et al's paper

* "MemC3: Compact and Concurrent MemCache with Dumber Caching and

100

* Smarter Hashing". The benefit to use

101

* XOR is that one could derive the alternative bucket location

102

* by only using the current bucket location and the signature.

103

104

static inline uint16_t

105

get_short_sig(const hash_sig_t hash)

106

{

107

return hash >> 16;

108

}

109

110

static inline uint32_t

111

get_prim_bucket_index(const struct rte_hash *h, const hash_sig_t hash)

112

{

113

return hash & h->bucket_bitmask;

114

}

115

116

static inline uint32_t

117

get_alt_bucket_index(const struct rte_hash *h,

118

uint32_t cur_bkt_idx, uint16_t sig)

119

{

120

return (cur_bkt_idx ^ sig) & h->bucket_bitmask;

121

}

122

123

struct rte_hash *

124

rte_hash_create(const struct rte_hash_parameters *params)

125

{

126

struct rte_hash *h = NULL((void*)0);

127

struct rte_tailq_entry *te = NULL((void*)0);

128

struct rte_hash_list *hash_list;

129

struct rte_ring *r = NULL((void*)0);

130

struct rte_ring *r_ext = NULL((void*)0);

131

char hash_name[RTE_HASH_NAMESIZE32];

132

void *k = NULL((void*)0);

133

void *buckets = NULL((void*)0);

134

void *buckets_ext = NULL((void*)0);

135

char ring_name[RTE_RING_NAMESIZE(32 - sizeof("RG_") + 1)];

136

char ext_ring_name[RTE_RING_NAMESIZE(32 - sizeof("RG_") + 1)];

137

unsigned num_key_slots;

138

unsigned i;

139

unsigned int hw_trans_mem_support = 0, use_local_cache = 0;

140

unsigned int ext_table_support = 0;

141

unsigned int readwrite_concur_support = 0;

142

unsigned int writer_takes_lock = 0;

143

unsigned int no_free_on_del = 0;

144

uint32_t *ext_bkt_to_free = NULL((void*)0);

145

uint32_t *tbl_chng_cnt = NULL((void*)0);

146

unsigned int readwrite_concur_lf_support = 0;

147

148

rte_hash_function default_hash_func = (rte_hash_function)rte_jhash;

149

150

hash_list = RTE_TAILQ_CAST(rte_hash_tailq.head, rte_hash_list)(struct rte_hash_list *)&(rte_hash_tailq.head)->tailq_head;

151

152

if (params == NULL((void*)0)) {

153

RTE_LOG(ERR, HASH, "rte_hash_create has no parameters\n")rte_log(4U, 6, "HASH" ": " "rte_hash_create has no parameters\n"
);

154

return NULL((void*)0);

155

}

156

157

/* Check for valid parameters */

158

if ((params->entries > RTE_HASH_ENTRIES_MAX(1 << 30)) ||

159

(params->entries < RTE_HASH_BUCKET_ENTRIES8) ||

160

(params->key_len == 0)) {

161

rte_errno(per_lcore__rte_errno) = EINVAL22;

162

RTE_LOG(ERR, HASH, "rte_hash_create has invalid parameters\n")rte_log(4U, 6, "HASH" ": " "rte_hash_create has invalid parameters\n"
);

163

return NULL((void*)0);

164

}

165

166

/* Validate correct usage of extra options */

167

if ((params->extra_flag & RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY0x04) &&

168

(params->extra_flag & RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY_LF0x20)) {

169

rte_errno(per_lcore__rte_errno) = EINVAL22;

170

RTE_LOG(ERR, HASH, "rte_hash_create: choose rw concurrency or "rte_log(4U, 6, "HASH" ": " "rte_hash_create: choose rw concurrency or "
"rw concurrency lock free\n")

171

"rw concurrency lock free\n")rte_log(4U, 6, "HASH" ": " "rte_hash_create: choose rw concurrency or "
"rw concurrency lock free\n");

172

return NULL((void*)0);

173

}

174

175

/* Check extra flags field to check extra options. */

176

if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_TRANS_MEM_SUPPORT0x01)

177

hw_trans_mem_support = 1;

178

179

if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD0x02) {

180

use_local_cache = 1;

181

writer_takes_lock = 1;

182

}

183

184

if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY0x04) {

185

readwrite_concur_support = 1;

186

writer_takes_lock = 1;

187

}

188

189

if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_EXT_TABLE0x08)

190

ext_table_support = 1;

191

192

if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_NO_FREE_ON_DEL0x10)

193

no_free_on_del = 1;

194

195

if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY_LF0x20) {

196

readwrite_concur_lf_support = 1;

197

/* Enable not freeing internal memory/index on delete */

198

no_free_on_del = 1;

199

}

200

201

/* Store all keys and leave the first entry as a dummy entry for lookup_bulk */

202

if (use_local_cache)

203

204

* Increase number of slots by total number of indices

205

* that can be stored in the lcore caches

206

* except for the first cache

207

208

num_key_slots = params->entries + (RTE_MAX_LCORE128 - 1) *

209

(LCORE_CACHE_SIZE64 - 1) + 1;

210

else

211

num_key_slots = params->entries + 1;

212

213

snprintf(ring_name, sizeof(ring_name), "HT_%s", params->name);

214

/* Create ring (Dummy slot index is not enqueued) */

215

r = rte_ring_create(ring_name, rte_align32pow2(num_key_slots),

216

params->socket_id, 0);

217

if (r == NULL((void*)0)) {

218

RTE_LOG(ERR, HASH, "memory allocation failed\n")rte_log(4U, 6, "HASH" ": " "memory allocation failed\n");

219

goto err;

220

}

221

222

const uint32_t num_buckets = rte_align32pow2(params->entries) /

223

RTE_HASH_BUCKET_ENTRIES8;

224

225

/* Create ring for extendable buckets. */

226

if (ext_table_support) {

227

snprintf(ext_ring_name, sizeof(ext_ring_name), "HT_EXT_%s",

228

params->name);

229

r_ext = rte_ring_create(ext_ring_name,

230

rte_align32pow2(num_buckets + 1),

231

params->socket_id, 0);

232

233

if (r_ext == NULL((void*)0)) {

234

RTE_LOG(ERR, HASH, "ext buckets memory allocation "rte_log(4U, 6, "HASH" ": " "ext buckets memory allocation " "failed\n"
)

235

"failed\n")rte_log(4U, 6, "HASH" ": " "ext buckets memory allocation " "failed\n"
);

236

goto err;

237

}

238

}

239

240

snprintf(hash_name, sizeof(hash_name), "HT_%s", params->name);

241

242

rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK(&rte_eal_get_configuration()->mem_config->qlock));

243

244

/* guarantee there's no existing: this is normally already checked

245

* by ring creation above */

246

TAILQ_FOREACH(te, hash_list, next)for ((te) = ((hash_list)->tqh_first); (te); (te) = ((te)->
next.tqe_next)) {

247

h = (struct rte_hash *) te->data;

248

if (strncmp(params->name, h->name, RTE_HASH_NAMESIZE)(__extension__ (__builtin_constant_p (32) && ((__builtin_constant_p
(params->name) && strlen (params->name) < (
(size_t) (32))) || (__builtin_constant_p (h->name) &&
strlen (h->name) < ((size_t) (32)))) ? __extension__ (
{ size_t __s1_len, __s2_len; (__builtin_constant_p (params->
name) && __builtin_constant_p (h->name) &&
(__s1_len = __builtin_strlen (params->name), __s2_len = __builtin_strlen
(h->name), (!((size_t)(const void *)((params->name) + 1
) - (size_t)(const void *)(params->name) == 1) || __s1_len
>= 4) && (!((size_t)(const void *)((h->name) +
1) - (size_t)(const void *)(h->name) == 1) || __s2_len >=
4)) ? __builtin_strcmp (params->name, h->name) : (__builtin_constant_p
(params->name) && ((size_t)(const void *)((params
->name) + 1) - (size_t)(const void *)(params->name) == 1
) && (__s1_len = __builtin_strlen (params->name), __s1_len
< 4) ? (__builtin_constant_p (h->name) && ((size_t
)(const void *)((h->name) + 1) - (size_t)(const void *)(h->
name) == 1) ? __builtin_strcmp (params->name, h->name) :
(__extension__ ({ const unsigned char *__s2 = (const unsigned
char *) (const char *) (h->name); int __result = (((const
unsigned char *) (const char *) (params->name))[0] - __s2
[0]); if (__s1_len > 0 && __result == 0) { __result
= (((const unsigned char *) (const char *) (params->name)
)[1] - __s2[1]); if (__s1_len > 1 && __result == 0
) { __result = (((const unsigned char *) (const char *) (params
->name))[2] - __s2[2]); if (__s1_len > 2 && __result
== 0) __result = (((const unsigned char *) (const char *) (params
->name))[3] - __s2[3]); } } __result; }))) : (__builtin_constant_p
(h->name) && ((size_t)(const void *)((h->name)
+ 1) - (size_t)(const void *)(h->name) == 1) && (
__s2_len = __builtin_strlen (h->name), __s2_len < 4) ? (
__builtin_constant_p (params->name) && ((size_t)(const
void *)((params->name) + 1) - (size_t)(const void *)(params
->name) == 1) ? __builtin_strcmp (params->name, h->name
) : (- (__extension__ ({ const unsigned char *__s2 = (const unsigned
char *) (const char *) (params->name); int __result = (((
const unsigned char *) (const char *) (h->name))[0] - __s2
[0]); if (__s2_len > 0 && __result == 0) { __result
= (((const unsigned char *) (const char *) (h->name))[1] -
__s2[1]); if (__s2_len > 1 && __result == 0) { __result
= (((const unsigned char *) (const char *) (h->name))[2] -
__s2[2]); if (__s2_len > 2 && __result == 0) __result
= (((const unsigned char *) (const char *) (h->name))[3] -
__s2[3]); } } __result; })))) : __builtin_strcmp (params->
name, h->name)))); }) : strncmp (params->name, h->name
, 32))) == 0)

249

break;

250

}

251

h = NULL((void*)0);

252

if (te != NULL((void*)0)) {

253

rte_errno(per_lcore__rte_errno) = EEXIST17;

254

te = NULL((void*)0);

255

goto err_unlock;

256

}

257

258

te = rte_zmalloc("HASH_TAILQ_ENTRY", sizeof(*te), 0);

259

if (te == NULL((void*)0)) {

260

RTE_LOG(ERR, HASH, "tailq entry allocation failed\n")rte_log(4U, 6, "HASH" ": " "tailq entry allocation failed\n");

261

goto err_unlock;

262

}

263

264

h = (struct rte_hash *)rte_zmalloc_socket(hash_name, sizeof(struct rte_hash),

265

RTE_CACHE_LINE_SIZE64, params->socket_id);

266

267

if (h == NULL((void*)0)) {

268

RTE_LOG(ERR, HASH, "memory allocation failed\n")rte_log(4U, 6, "HASH" ": " "memory allocation failed\n");

269

goto err_unlock;

270

}

271

272

buckets = rte_zmalloc_socket(NULL((void*)0),

273

num_buckets * sizeof(struct rte_hash_bucket),

274

RTE_CACHE_LINE_SIZE64, params->socket_id);

275

276

if (buckets == NULL((void*)0)) {

277

RTE_LOG(ERR, HASH, "buckets memory allocation failed\n")rte_log(4U, 6, "HASH" ": " "buckets memory allocation failed\n"
);

278

goto err_unlock;

279

}

280

281

/* Allocate same number of extendable buckets */

282

if (ext_table_support) {

283

buckets_ext = rte_zmalloc_socket(NULL((void*)0),

284

num_buckets * sizeof(struct rte_hash_bucket),

285

RTE_CACHE_LINE_SIZE64, params->socket_id);

286

if (buckets_ext == NULL((void*)0)) {

287

RTE_LOG(ERR, HASH, "ext buckets memory allocation "rte_log(4U, 6, "HASH" ": " "ext buckets memory allocation " "failed\n"
)

288

"failed\n")rte_log(4U, 6, "HASH" ": " "ext buckets memory allocation " "failed\n"
);

289

goto err_unlock;

290

}

291

/* Populate ext bkt ring. We reserve 0 similar to the

292

* key-data slot, just in case in future we want to

293

* use bucket index for the linked list and 0 means NULL

294

* for next bucket

295

296

for (i = 1; i <= num_buckets; i++)

297

rte_ring_sp_enqueue(r_ext, (void *)((uintptr_t) i));

298

299

if (readwrite_concur_lf_support) {

300

ext_bkt_to_free = rte_zmalloc(NULL((void*)0), sizeof(uint32_t) *

301

num_key_slots, 0);

302

if (ext_bkt_to_free == NULL((void*)0)) {

303

RTE_LOG(ERR, HASH, "ext bkt to free memory allocation "rte_log(4U, 6, "HASH" ": " "ext bkt to free memory allocation "
"failed\n")

304

"failed\n")rte_log(4U, 6, "HASH" ": " "ext bkt to free memory allocation "
"failed\n");

305

goto err_unlock;

306

}

307

}

308

}

309

310

const uint32_t key_entry_size =

311

RTE_ALIGN(sizeof(struct rte_hash_key) + params->key_len,(__typeof__(((sizeof(struct rte_hash_key) + params->key_len
) + ((__typeof__(sizeof(struct rte_hash_key) + params->key_len
)) (16) - 1))))((((sizeof(struct rte_hash_key) + params->key_len
) + ((__typeof__(sizeof(struct rte_hash_key) + params->key_len
)) (16) - 1))) & (~((__typeof__(((sizeof(struct rte_hash_key
) + params->key_len) + ((__typeof__(sizeof(struct rte_hash_key
) + params->key_len)) (16) - 1))))((16) - 1))))

312

KEY_ALIGNMENT)(__typeof__(((sizeof(struct rte_hash_key) + params->key_len
) + ((__typeof__(sizeof(struct rte_hash_key) + params->key_len
)) (16) - 1))))((((sizeof(struct rte_hash_key) + params->key_len
) + ((__typeof__(sizeof(struct rte_hash_key) + params->key_len
)) (16) - 1))) & (~((__typeof__(((sizeof(struct rte_hash_key
) + params->key_len) + ((__typeof__(sizeof(struct rte_hash_key
) + params->key_len)) (16) - 1))))((16) - 1))));

313

const uint64_t key_tbl_size = (uint64_t) key_entry_size * num_key_slots;

314

315

k = rte_zmalloc_socket(NULL((void*)0), key_tbl_size,

316

RTE_CACHE_LINE_SIZE64, params->socket_id);

317

318

if (k == NULL((void*)0)) {

319

RTE_LOG(ERR, HASH, "memory allocation failed\n")rte_log(4U, 6, "HASH" ": " "memory allocation failed\n");

320

goto err_unlock;

321

}

322

323

tbl_chng_cnt = rte_zmalloc_socket(NULL((void*)0), sizeof(uint32_t),

324

RTE_CACHE_LINE_SIZE64, params->socket_id);

325

326

if (tbl_chng_cnt == NULL((void*)0)) {

327

RTE_LOG(ERR, HASH, "memory allocation failed\n")rte_log(4U, 6, "HASH" ": " "memory allocation failed\n");

328

goto err_unlock;

329

}

330

331

332

* If x86 architecture is used, select appropriate compare function,

333

* which may use x86 intrinsics, otherwise use memcmp

334

335

#if defined(RTE_ARCH_X861) || defined(RTE_ARCH_ARM64)

336

/* Select function to compare keys */

337

switch (params->key_len) {

338

case 16:

339

h->cmp_jump_table_idx = KEY_16_BYTES;

340

break;

341

case 32:

342

h->cmp_jump_table_idx = KEY_32_BYTES;

343

break;

344

case 48:

345

h->cmp_jump_table_idx = KEY_48_BYTES;

346

break;

347

case 64:

348

h->cmp_jump_table_idx = KEY_64_BYTES;

349

break;

350

case 80:

351

h->cmp_jump_table_idx = KEY_80_BYTES;

352

break;

353

case 96:

354

h->cmp_jump_table_idx = KEY_96_BYTES;

355

break;

356

case 112:

357

h->cmp_jump_table_idx = KEY_112_BYTES;

358

break;

359

case 128:

360

h->cmp_jump_table_idx = KEY_128_BYTES;

361

break;

362

default:

363

/* If key is not multiple of 16, use generic memcmp */

364

h->cmp_jump_table_idx = KEY_OTHER_BYTES;

365

}

366

#else

367

h->cmp_jump_table_idx = KEY_OTHER_BYTES;

368

#endif

369

370

if (use_local_cache) {

371

h->local_free_slots = rte_zmalloc_socket(NULL((void*)0),

372

sizeof(struct lcore_cache) * RTE_MAX_LCORE128,

373

RTE_CACHE_LINE_SIZE64, params->socket_id);

374

}

375

376

/* Default hash function */

377

#if defined(RTE_ARCH_X861)

378

default_hash_func = (rte_hash_function)rte_hash_crc;

379

#elif defined(RTE_ARCH_ARM64)

380

if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))

381

default_hash_func = (rte_hash_function)rte_hash_crc;

382

#endif

383

/* Setup hash context */

384

strlcpy(h->name, params->name, sizeof(h->name))rte_strlcpy(h->name, params->name, sizeof(h->name));

385

h->entries = params->entries;

386

h->key_len = params->key_len;

387

h->key_entry_size = key_entry_size;

388

h->hash_func_init_val = params->hash_func_init_val;

389

390

h->num_buckets = num_buckets;

391

h->bucket_bitmask = h->num_buckets - 1;

392

h->buckets = buckets;

393

h->buckets_ext = buckets_ext;

394

h->free_ext_bkts = r_ext;

395

h->hash_func = (params->hash_func == NULL((void*)0)) ?

396

default_hash_func : params->hash_func;

397

h->key_store = k;

398

h->free_slots = r;

399

h->ext_bkt_to_free = ext_bkt_to_free;

400

h->tbl_chng_cnt = tbl_chng_cnt;

401

*h->tbl_chng_cnt = 0;

402

h->hw_trans_mem_support = hw_trans_mem_support;

403

h->use_local_cache = use_local_cache;

404

h->readwrite_concur_support = readwrite_concur_support;

405

h->ext_table_support = ext_table_support;

406

h->writer_takes_lock = writer_takes_lock;

407

h->no_free_on_del = no_free_on_del;

408

h->readwrite_concur_lf_support = readwrite_concur_lf_support;

409

410

#if defined(RTE_ARCH_X861)

411

if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE2))

412

h->sig_cmp_fn = RTE_HASH_COMPARE_SSE;

413

else

414

#elif defined(RTE_ARCH_ARM64)

415

if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON))

416

h->sig_cmp_fn = RTE_HASH_COMPARE_NEON;

417

else

418

#endif

419

h->sig_cmp_fn = RTE_HASH_COMPARE_SCALAR;

420

421

/* Writer threads need to take the lock when:

422

* 1) RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY is enabled OR

423

* 2) RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD is enabled

424

425

if (h->writer_takes_lock) {

426

h->readwrite_lock = rte_malloc(NULL((void*)0), sizeof(rte_rwlock_t),

427

RTE_CACHE_LINE_SIZE64);

428

if (h->readwrite_lock == NULL((void*)0))

429

goto err_unlock;

430

431

rte_rwlock_init(h->readwrite_lock);

432

}

433

434

/* Populate free slots ring. Entry zero is reserved for key misses. */

435

for (i = 1; i < num_key_slots; i++)

436

rte_ring_sp_enqueue(r, (void *)((uintptr_t) i));

437

438

te->data = (void *) h;

439

TAILQ_INSERT_TAIL(hash_list, te, next)do { (te)->next.tqe_next = ((void*)0); (te)->next.tqe_prev
= (hash_list)->tqh_last; *(hash_list)->tqh_last = (te)
; (hash_list)->tqh_last = &(te)->next.tqe_next; } while
( 0);

440

rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK(&rte_eal_get_configuration()->mem_config->qlock));

441

442

return h;

443

err_unlock:

444

rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK(&rte_eal_get_configuration()->mem_config->qlock));

445

err:

446

rte_ring_free(r);

447

rte_ring_free(r_ext);

448

rte_free(te);

449

rte_free(h);

450

rte_free(buckets);

451

rte_free(buckets_ext);

452

rte_free(k);

453

rte_free(tbl_chng_cnt);

454

rte_free(ext_bkt_to_free);

455

return NULL((void*)0);

456

}

457

458

void

459

rte_hash_free(struct rte_hash *h)

460

{

461

struct rte_tailq_entry *te;

462

struct rte_hash_list *hash_list;

463

464

if (h == NULL((void*)0))

465

return;

466

467

hash_list = RTE_TAILQ_CAST(rte_hash_tailq.head, rte_hash_list)(struct rte_hash_list *)&(rte_hash_tailq.head)->tailq_head;

468

469

rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK(&rte_eal_get_configuration()->mem_config->qlock));

470

471

/* find out tailq entry */

472

TAILQ_FOREACH(te, hash_list, next)for ((te) = ((hash_list)->tqh_first); (te); (te) = ((te)->
next.tqe_next)) {

473

if (te->data == (void *) h)

474

break;

475

}

476

477

if (te == NULL((void*)0)) {

478

rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK(&rte_eal_get_configuration()->mem_config->qlock));

479

return;

480

}

481

482

TAILQ_REMOVE(hash_list, te, next)do { if (((te)->next.tqe_next) != ((void*)0)) (te)->next
.tqe_next->next.tqe_prev = (te)->next.tqe_prev; else (hash_list
)->tqh_last = (te)->next.tqe_prev; *(te)->next.tqe_prev
= (te)->next.tqe_next; } while ( 0);

483

484

rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK(&rte_eal_get_configuration()->mem_config->qlock));

485

486

if (h->use_local_cache)

487

rte_free(h->local_free_slots);

488

if (h->writer_takes_lock)

489

rte_free(h->readwrite_lock);

490

rte_ring_free(h->free_slots);

491

rte_ring_free(h->free_ext_bkts);

492

rte_free(h->key_store);

493

rte_free(h->buckets);

494

rte_free(h->buckets_ext);

495

rte_free(h->tbl_chng_cnt);

496

rte_free(h->ext_bkt_to_free);

497

rte_free(h);

498

rte_free(te);

499

}

500

501

hash_sig_t

502

rte_hash_hash(const struct rte_hash *h, const void *key)

503

{

504

/* calc hash result by key */

505

return h->hash_func(key, h->key_len, h->hash_func_init_val);

506

}

507

508

int32_t

509

rte_hash_count(const struct rte_hash *h)

510

{

511

uint32_t tot_ring_cnt, cached_cnt = 0;

512

uint32_t i, ret;

513

514

if (h == NULL((void*)0))

515

return -EINVAL22;

516

517

if (h->use_local_cache) {

518

tot_ring_cnt = h->entries + (RTE_MAX_LCORE128 - 1) *

519

(LCORE_CACHE_SIZE64 - 1);

520

for (i = 0; i < RTE_MAX_LCORE128; i++)

521

cached_cnt += h->local_free_slots[i].len;

522

523

ret = tot_ring_cnt - rte_ring_count(h->free_slots) -

524

cached_cnt;

525

} else {

526

tot_ring_cnt = h->entries;

527

ret = tot_ring_cnt - rte_ring_count(h->free_slots);

528

}

529

return ret;

530

}

531

532

/* Read write locks implemented using rte_rwlock */

533

static inline void

534

__hash_rw_writer_lock(const struct rte_hash *h)

535

{

536

if (h->writer_takes_lock && h->hw_trans_mem_support)

537

rte_rwlock_write_lock_tm(h->readwrite_lock);

538

else if (h->writer_takes_lock)

539

rte_rwlock_write_lock(h->readwrite_lock);

540

}

541

542

static inline void

543

__hash_rw_reader_lock(const struct rte_hash *h)

544

{

545

if (h->readwrite_concur_support && h->hw_trans_mem_support)

546

rte_rwlock_read_lock_tm(h->readwrite_lock);

547

else if (h->readwrite_concur_support)

548

rte_rwlock_read_lock(h->readwrite_lock);

549

}

550

551

static inline void

552

__hash_rw_writer_unlock(const struct rte_hash *h)

553

{

554

if (h->writer_takes_lock && h->hw_trans_mem_support)

555

rte_rwlock_write_unlock_tm(h->readwrite_lock);

556

else if (h->writer_takes_lock)

557

rte_rwlock_write_unlock(h->readwrite_lock);

558

}

559

560

static inline void

561

__hash_rw_reader_unlock(const struct rte_hash *h)

562

{

563

if (h->readwrite_concur_support && h->hw_trans_mem_support)

564

rte_rwlock_read_unlock_tm(h->readwrite_lock);

565

else if (h->readwrite_concur_support)

566

rte_rwlock_read_unlock(h->readwrite_lock);

567

}

568

569

void

570

rte_hash_reset(struct rte_hash *h)

571

{

572

void *ptr;

573

uint32_t tot_ring_cnt, i;

574

575

if (h == NULL((void*)0))

576

return;

577

578

__hash_rw_writer_lock(h);

579

memset(h->buckets, 0, h->num_buckets * sizeof(struct rte_hash_bucket));

580

memset(h->key_store, 0, h->key_entry_size * (h->entries + 1));

581

*h->tbl_chng_cnt = 0;

582

583

/* clear the free ring */

584

while (rte_ring_dequeue(h->free_slots, &ptr) == 0)

585

continue;

586

587

/* clear free extendable bucket ring and memory */

588

if (h->ext_table_support) {

589

memset(h->buckets_ext, 0, h->num_buckets *

590

sizeof(struct rte_hash_bucket));

591

while (rte_ring_dequeue(h->free_ext_bkts, &ptr) == 0)

592

continue;

593

}

594

595

/* Repopulate the free slots ring. Entry zero is reserved for key misses */

596

if (h->use_local_cache)

597

tot_ring_cnt = h->entries + (RTE_MAX_LCORE128 - 1) *

598

(LCORE_CACHE_SIZE64 - 1);

599

else

600

tot_ring_cnt = h->entries;

601

602

for (i = 1; i < tot_ring_cnt + 1; i++)

603

rte_ring_sp_enqueue(h->free_slots, (void *)((uintptr_t) i));

604

605

/* Repopulate the free ext bkt ring. */

606

if (h->ext_table_support) {

607

for (i = 1; i <= h->num_buckets; i++)

608

rte_ring_sp_enqueue(h->free_ext_bkts,

609

(void *)((uintptr_t) i));

610

}

611

612

if (h->use_local_cache) {

613

/* Reset local caches per lcore */

614

for (i = 0; i < RTE_MAX_LCORE128; i++)

615

h->local_free_slots[i].len = 0;

616

}

617

__hash_rw_writer_unlock(h);

618

}

619

620

621

* Function called to enqueue back an index in the cache/ring,

622

* as slot has not being used and it can be used in the

623

* next addition attempt.

624

625

static inline void

626

enqueue_slot_back(const struct rte_hash *h,

627

struct lcore_cache *cached_free_slots,

628

void *slot_id)

629

{

630

if (h->use_local_cache) {

←

Assuming the condition is true

→

←

Taking true branch

→

631

cached_free_slots->objs[cached_free_slots->len] = slot_id;

←

Access to field 'len' results in a dereference of a null pointer (loaded from variable 'cached_free_slots')

632

cached_free_slots->len++;

633

} else

634

rte_ring_sp_enqueue(h->free_slots, slot_id);

635

}

636

637

/* Search a key from bucket and update its data.

638

* Writer holds the lock before calling this.

639

640

static inline int32_t

641

search_and_update(const struct rte_hash *h, void *data, const void *key,

642

struct rte_hash_bucket *bkt, uint16_t sig)

643

{

644

int i;

645

struct rte_hash_key *k, *keys = h->key_store;

646

647

for (i = 0; i < RTE_HASH_BUCKET_ENTRIES8; i++) {

648

if (bkt->sig_current[i] == sig) {

649

k = (struct rte_hash_key *) ((char *)keys +

650

bkt->key_idx[i] * h->key_entry_size);

651

if (rte_hash_cmp_eq(key, k->key, h) == 0) {

652

/* 'pdata' acts as the synchronization point

653

* when an existing hash entry is updated.

654

* Key is not updated in this case.

655

656

__atomic_store_n(&k->pdata,

657

data,

658

__ATOMIC_RELEASE3);

659

660

* Return index where key is stored,

661

* subtracting the first dummy index

662

663

return bkt->key_idx[i] - 1;

664

}

665

}

666

}

667

return -1;

668

}

669

670

/* Only tries to insert at one bucket (@prim_bkt) without trying to push

671

* buckets around.

672

* return 1 if matching existing key, return 0 if succeeds, return -1 for no

673

* empty entry.

674

675

static inline int32_t

676

rte_hash_cuckoo_insert_mw(const struct rte_hash *h,

677

struct rte_hash_bucket *prim_bkt,

678

struct rte_hash_bucket *sec_bkt,

679

const struct rte_hash_key *key, void *data,

680

uint16_t sig, uint32_t new_idx,

681

int32_t *ret_val)

682

{

683

unsigned int i;

684

struct rte_hash_bucket *cur_bkt;

685

int32_t ret;

686

687

__hash_rw_writer_lock(h);

688

/* Check if key was inserted after last check but before this

689

* protected region in case of inserting duplicated keys.

690

691

ret = search_and_update(h, data, key, prim_bkt, sig);

692

if (ret != -1) {

693

__hash_rw_writer_unlock(h);

694

*ret_val = ret;

695

return 1;

696

}

697

698

FOR_EACH_BUCKET(cur_bkt, sec_bkt)for (cur_bkt = sec_bkt; cur_bkt != ((void*)0); cur_bkt = cur_bkt
->next) {

699

ret = search_and_update(h, data, key, cur_bkt, sig);

700

if (ret != -1) {

701

__hash_rw_writer_unlock(h);

702

*ret_val = ret;

703

return 1;

704

}

705

}

706

707

/* Insert new entry if there is room in the primary

708

* bucket.

709

710

for (i = 0; i < RTE_HASH_BUCKET_ENTRIES8; i++) {

711

/* Check if slot is available */

712

if (likely(prim_bkt->key_idx[i] == EMPTY_SLOT)__builtin_expect(!!(prim_bkt->key_idx[i] == 0), 1)) {

713

prim_bkt->sig_current[i] = sig;

714

/* Key can be of arbitrary length, so it is

715

* not possible to store it atomically.

716

* Hence the new key element's memory stores

717

* (key as well as data) should be complete

718

* before it is referenced.

719

720

__atomic_store_n(&prim_bkt->key_idx[i],

721

new_idx,

722

__ATOMIC_RELEASE3);

723

break;

724

}

725

}

726

__hash_rw_writer_unlock(h);

727

728

if (i != RTE_HASH_BUCKET_ENTRIES8)

729

return 0;

730

731

/* no empty entry */

732

return -1;

733

}

734

735

/* Shift buckets along provided cuckoo_path (@leaf and @leaf_slot) and fill

736

* the path head with new entry (sig, alt_hash, new_idx)

737

* return 1 if matched key found, return -1 if cuckoo path invalided and fail,

738

* return 0 if succeeds.

739

740

static inline int

741

rte_hash_cuckoo_move_insert_mw(const struct rte_hash *h,

742

struct rte_hash_bucket *bkt,

743

struct rte_hash_bucket *alt_bkt,

744

const struct rte_hash_key *key, void *data,

745

struct queue_node *leaf, uint32_t leaf_slot,

746

uint16_t sig, uint32_t new_idx,

747

int32_t *ret_val)

748

{

749

uint32_t prev_alt_bkt_idx;

750

struct rte_hash_bucket *cur_bkt;

751

struct queue_node *prev_node, *curr_node = leaf;

752

struct rte_hash_bucket *prev_bkt, *curr_bkt = leaf->bkt;

753

uint32_t prev_slot, curr_slot = leaf_slot;

754

int32_t ret;

755

756

__hash_rw_writer_lock(h);

757

758

/* In case empty slot was gone before entering protected region */

759

if (curr_bkt->key_idx[curr_slot] != EMPTY_SLOT0) {

760

__hash_rw_writer_unlock(h);

761

return -1;

762

}

763

764

/* Check if key was inserted after last check but before this

765

* protected region.

766

767

ret = search_and_update(h, data, key, bkt, sig);

768

if (ret != -1) {

769

__hash_rw_writer_unlock(h);

770

*ret_val = ret;

771

return 1;

772

}

773

774

FOR_EACH_BUCKET(cur_bkt, alt_bkt)for (cur_bkt = alt_bkt; cur_bkt != ((void*)0); cur_bkt = cur_bkt
->next) {

775

ret = search_and_update(h, data, key, cur_bkt, sig);

776

if (ret != -1) {

777

__hash_rw_writer_unlock(h);

778

*ret_val = ret;

779

return 1;

780

}

781

}

782

783

while (likely(curr_node->prev != NULL)__builtin_expect(!!(curr_node->prev != ((void*)0)), 1)) {

784

prev_node = curr_node->prev;

785

prev_bkt = prev_node->bkt;

786

prev_slot = curr_node->prev_slot;

787

788

prev_alt_bkt_idx = get_alt_bucket_index(h,

789

prev_node->cur_bkt_idx,

790

prev_bkt->sig_current[prev_slot]);

791

792

if (unlikely(&h->buckets[prev_alt_bkt_idx]__builtin_expect(!!(&h->buckets[prev_alt_bkt_idx] != curr_bkt
), 0)

793

!= curr_bkt)__builtin_expect(!!(&h->buckets[prev_alt_bkt_idx] != curr_bkt
), 0)) {

794

/* revert it to empty, otherwise duplicated keys */

795

__atomic_store_n(&curr_bkt->key_idx[curr_slot],

796

EMPTY_SLOT0,

797

__ATOMIC_RELEASE3);

798

__hash_rw_writer_unlock(h);

799

return -1;

800

}

801

802

if (h->readwrite_concur_lf_support) {

803

/* Inform the previous move. The current move need

804

* not be informed now as the current bucket entry

805

* is present in both primary and secondary.

806

* Since there is one writer, load acquires on

807

* tbl_chng_cnt are not required.

808

809

__atomic_store_n(h->tbl_chng_cnt,

810

*h->tbl_chng_cnt + 1,

811

__ATOMIC_RELEASE3);

812

/* The store to sig_current should not

813

* move above the store to tbl_chng_cnt.

814

815

__atomic_thread_fence(__ATOMIC_RELEASE3);

816

}

817

818

/* Need to swap current/alt sig to allow later

819

* Cuckoo insert to move elements back to its

820

* primary bucket if available

821

822

curr_bkt->sig_current[curr_slot] =

823

prev_bkt->sig_current[prev_slot];

824

/* Release the updated bucket entry */

825

__atomic_store_n(&curr_bkt->key_idx[curr_slot],

826

prev_bkt->key_idx[prev_slot],

827

__ATOMIC_RELEASE3);

828

829

curr_slot = prev_slot;

830

curr_node = prev_node;

831

curr_bkt = curr_node->bkt;

832

}

833

834

if (h->readwrite_concur_lf_support) {

835

/* Inform the previous move. The current move need

836

* not be informed now as the current bucket entry

837

* is present in both primary and secondary.

838

* Since there is one writer, load acquires on

839

* tbl_chng_cnt are not required.

840

841

__atomic_store_n(h->tbl_chng_cnt,

842

*h->tbl_chng_cnt + 1,

843

__ATOMIC_RELEASE3);

844

/* The store to sig_current should not

845

* move above the store to tbl_chng_cnt.

846

847

__atomic_thread_fence(__ATOMIC_RELEASE3);

848

}

849

850

curr_bkt->sig_current[curr_slot] = sig;

851

/* Release the new bucket entry */

852

__atomic_store_n(&curr_bkt->key_idx[curr_slot],

853

new_idx,

854

__ATOMIC_RELEASE3);

855

856

__hash_rw_writer_unlock(h);

857

858

return 0;

859

860

}

861

862

863

* Make space for new key, using bfs Cuckoo Search and Multi-Writer safe

864

* Cuckoo

865

866

static inline int

867

rte_hash_cuckoo_make_space_mw(const struct rte_hash *h,

868

struct rte_hash_bucket *bkt,

869

struct rte_hash_bucket *sec_bkt,

870

const struct rte_hash_key *key, void *data,

871

uint16_t sig, uint32_t bucket_idx,

872

uint32_t new_idx, int32_t *ret_val)

873

{

874

unsigned int i;

875

struct queue_node queue[RTE_HASH_BFS_QUEUE_MAX_LEN1000];

876

struct queue_node *tail, *head;

877

struct rte_hash_bucket *curr_bkt, *alt_bkt;

878

uint32_t cur_idx, alt_idx;

879

880

tail = queue;

881

head = queue + 1;

882

tail->bkt = bkt;

883

tail->prev = NULL((void*)0);

884

tail->prev_slot = -1;

885

tail->cur_bkt_idx = bucket_idx;

886

887

/* Cuckoo bfs Search */

888

while (likely(tail != head && head <__builtin_expect(!!(tail != head && head < queue +
1000 - 8), 1)

889

queue + RTE_HASH_BFS_QUEUE_MAX_LEN -__builtin_expect(!!(tail != head && head < queue +
1000 - 8), 1)

890

RTE_HASH_BUCKET_ENTRIES)__builtin_expect(!!(tail != head && head < queue +
1000 - 8), 1)) {

891

curr_bkt = tail->bkt;

892

cur_idx = tail->cur_bkt_idx;

893

for (i = 0; i < RTE_HASH_BUCKET_ENTRIES8; i++) {

894

if (curr_bkt->key_idx[i] == EMPTY_SLOT0) {

895

int32_t ret = rte_hash_cuckoo_move_insert_mw(h,

896

bkt, sec_bkt, key, data,

897

tail, i, sig,

898

new_idx, ret_val);

899

if (likely(ret != -1)__builtin_expect(!!(ret != -1), 1))

900

return ret;

901

}

902

903

/* Enqueue new node and keep prev node info */

904

alt_idx = get_alt_bucket_index(h, cur_idx,

905

curr_bkt->sig_current[i]);

906

alt_bkt = &(h->buckets[alt_idx]);

907

head->bkt = alt_bkt;

908

head->cur_bkt_idx = alt_idx;

909

head->prev = tail;

910

head->prev_slot = i;

911

head++;

912

}

913

tail++;

914

}

915

916

return -ENOSPC28;

917

}

918

919

static inline int32_t

920

__rte_hash_add_key_with_hash(const struct rte_hash *h, const void *key,

921

hash_sig_t sig, void *data)

922

{

923

uint16_t short_sig;

924

uint32_t prim_bucket_idx, sec_bucket_idx;

925

struct rte_hash_bucket *prim_bkt, *sec_bkt, *cur_bkt;

926

struct rte_hash_key *new_k, *keys = h->key_store;

927

void *slot_id = NULL((void*)0);

928

void *ext_bkt_id = NULL((void*)0);

929

uint32_t new_idx, bkt_id;

930

int ret;

931

unsigned n_slots;

932

unsigned lcore_id;

933

unsigned int i;

934

struct lcore_cache *cached_free_slots = NULL((void*)0);

←

'cached_free_slots' initialized to a null pointer value

→

935

int32_t ret_val;

936

struct rte_hash_bucket *last;

937

938

short_sig = get_short_sig(sig);

939

prim_bucket_idx = get_prim_bucket_index(h, sig);

940

sec_bucket_idx = get_alt_bucket_index(h, prim_bucket_idx, short_sig);

941

prim_bkt = &h->buckets[prim_bucket_idx];

942

sec_bkt = &h->buckets[sec_bucket_idx];

943

rte_prefetch0(prim_bkt);

944

rte_prefetch0(sec_bkt);

945

946

/* Check if key is already inserted in primary location */

947

__hash_rw_writer_lock(h);

948

ret = search_and_update(h, data, key, prim_bkt, short_sig);

949

if (ret != -1) {

←

Assuming the condition is false

→

←

Taking false branch

→

950

__hash_rw_writer_unlock(h);

951

return ret;

952

}

953

954

/* Check if key is already inserted in secondary location */

955

FOR_EACH_BUCKET(cur_bkt, sec_bkt)for (cur_bkt = sec_bkt; cur_bkt != ((void*)0); cur_bkt = cur_bkt
->next) {

956

ret = search_and_update(h, data, key, cur_bkt, short_sig);

957

if (ret != -1) {

958

__hash_rw_writer_unlock(h);

959

return ret;

960

}

961

}

962

963

__hash_rw_writer_unlock(h);

964

965

/* Did not find a match, so get a new slot for storing the new key */

966

if (h->use_local_cache) {

←

Assuming the condition is false

→

←

Taking false branch

→

967

lcore_id = rte_lcore_id();

968

cached_free_slots = &h->local_free_slots[lcore_id];

969

/* Try to get a free slot from the local cache */

970

if (cached_free_slots->len == 0) {

971

/* Need to get another burst of free slots from global ring */

972

n_slots = rte_ring_mc_dequeue_burst(h->free_slots,

973

cached_free_slots->objs,

974

LCORE_CACHE_SIZE64, NULL((void*)0));

975

if (n_slots == 0) {

976

return -ENOSPC28;

977

}

978

979

cached_free_slots->len += n_slots;

980

}

981

982

/* Get a free slot from the local cache */

983

cached_free_slots->len--;

984

slot_id = cached_free_slots->objs[cached_free_slots->len];

985

} else {

986

if (rte_ring_sc_dequeue(h->free_slots, &slot_id) != 0) {

←

Taking false branch

→

987

return -ENOSPC28;

988

}

989

}

990

991

new_k = RTE_PTR_ADD(keys, (uintptr_t)slot_id * h->key_entry_size)((void*)((uintptr_t)(keys) + ((uintptr_t)slot_id * h->key_entry_size
)));

992

new_idx = (uint32_t)((uintptr_t) slot_id);

993

/* Copy key */

994

memcpy(new_k->key, key, h->key_len);

995

/* Key can be of arbitrary length, so it is not possible to store

996

* it atomically. Hence the new key element's memory stores

997

* (key as well as data) should be complete before it is referenced.

998

* 'pdata' acts as the synchronization point when an existing hash

999

* entry is updated.

1000

1001

__atomic_store_n(&new_k->pdata,

1002

data,

1003

__ATOMIC_RELEASE3);

1004

1005

/* Find an empty slot and insert */

1006

ret = rte_hash_cuckoo_insert_mw(h, prim_bkt, sec_bkt, key, data,

1007

short_sig, new_idx, &ret_val);

1008

if (ret == 0)

←

Assuming 'ret' is not equal to 0

→

←

Taking false branch

→

1009

return new_idx - 1;

1010

else if (ret == 1) {

←

Assuming 'ret' is equal to 1

→

←

Taking true branch

→

1011

enqueue_slot_back(h, cached_free_slots, slot_id);

←

Passing null pointer value via 2nd parameter 'cached_free_slots'

→

←

Calling 'enqueue_slot_back'

→

1012

return ret_val;

1013

}

1014

1015

/* Primary bucket full, need to make space for new entry */

1016

ret = rte_hash_cuckoo_make_space_mw(h, prim_bkt, sec_bkt, key, data,

1017

short_sig, prim_bucket_idx, new_idx, &ret_val);

1018

if (ret == 0)

1019

return new_idx - 1;

1020

else if (ret == 1) {

1021

enqueue_slot_back(h, cached_free_slots, slot_id);

1022

return ret_val;

1023

}

1024

1025

/* Also search secondary bucket to get better occupancy */

1026

ret = rte_hash_cuckoo_make_space_mw(h, sec_bkt, prim_bkt, key, data,

1027

short_sig, sec_bucket_idx, new_idx, &ret_val);

1028

1029

if (ret == 0)

1030

return new_idx - 1;

1031

else if (ret == 1) {

1032

enqueue_slot_back(h, cached_free_slots, slot_id);

1033

return ret_val;

1034

}

1035

1036

/* if ext table not enabled, we failed the insertion */

1037

if (!h->ext_table_support) {

1038

enqueue_slot_back(h, cached_free_slots, slot_id);

1039

return ret;

1040

}

1041

1042

/* Now we need to go through the extendable bucket. Protection is needed

1043

* to protect all extendable bucket processes.

1044

1045

__hash_rw_writer_lock(h);

1046

/* We check for duplicates again since could be inserted before the lock */

1047

ret = search_and_update(h, data, key, prim_bkt, short_sig);

1048

if (ret != -1) {

1049

enqueue_slot_back(h, cached_free_slots, slot_id);

1050

goto failure;

1051

}

1052

1053

FOR_EACH_BUCKET(cur_bkt, sec_bkt)for (cur_bkt = sec_bkt; cur_bkt != ((void*)0); cur_bkt = cur_bkt
->next) {

1054

ret = search_and_update(h, data, key, cur_bkt, short_sig);

1055

if (ret != -1) {

1056

enqueue_slot_back(h, cached_free_slots, slot_id);

1057

goto failure;

1058

}

1059

}

1060

1061

/* Search sec and ext buckets to find an empty entry to insert. */

1062

FOR_EACH_BUCKET(cur_bkt, sec_bkt)for (cur_bkt = sec_bkt; cur_bkt != ((void*)0); cur_bkt = cur_bkt
->next) {

1063

for (i = 0; i < RTE_HASH_BUCKET_ENTRIES8; i++) {

1064

/* Check if slot is available */

1065

if (likely(cur_bkt->key_idx[i] == EMPTY_SLOT)__builtin_expect(!!(cur_bkt->key_idx[i] == 0), 1)) {

1066

cur_bkt->sig_current[i] = short_sig;

1067

/* Store to signature should not leak after

1068

* the store to key_idx

1069

1070

__atomic_store_n(&cur_bkt->key_idx[i],

1071

new_idx,

1072

__ATOMIC_RELEASE3);

1073

__hash_rw_writer_unlock(h);

1074

return new_idx - 1;

1075

}

1076

}

1077

}

1078

1079

/* Failed to get an empty entry from extendable buckets. Link a new

1080

* extendable bucket. We first get a free bucket from ring.

1081

1082

if (rte_ring_sc_dequeue(h->free_ext_bkts, &ext_bkt_id) != 0) {

1083

ret = -ENOSPC28;

1084

goto failure;

1085

}

1086

1087

bkt_id = (uint32_t)((uintptr_t)ext_bkt_id) - 1;

1088

/* Use the first location of the new bucket */

1089

(h->buckets_ext[bkt_id]).sig_current[0] = short_sig;

1090

/* Store to signature should not leak after

1091

* the store to key_idx

1092

1093

__atomic_store_n(&(h->buckets_ext[bkt_id]).key_idx[0],

1094

new_idx,

1095

__ATOMIC_RELEASE3);

1096

/* Link the new bucket to sec bucket linked list */

1097

last = rte_hash_get_last_bkt(sec_bkt);

1098

last->next = &h->buckets_ext[bkt_id];

1099

__hash_rw_writer_unlock(h);

1100

return new_idx - 1;

1101

1102

failure:

1103

__hash_rw_writer_unlock(h);

1104

return ret;

1105

1106

}

1107

1108

int32_t

1109

rte_hash_add_key_with_hash(const struct rte_hash *h,

1110

const void *key, hash_sig_t sig)

1111

{

1112

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1113

return __rte_hash_add_key_with_hash(h, key, sig, 0);

1114

}

1115

1116

int32_t

1117

rte_hash_add_key(const struct rte_hash *h, const void *key)

1118

{

1119

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1120

return __rte_hash_add_key_with_hash(h, key, rte_hash_hash(h, key), 0);

1121

}

1122

1123

int

1124

rte_hash_add_key_with_hash_data(const struct rte_hash *h,

1125

const void *key, hash_sig_t sig, void *data)

1126

{

1127

int ret;

1128

1129

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1130

ret = __rte_hash_add_key_with_hash(h, key, sig, data);

1131

if (ret >= 0)

1132

return 0;

1133

else

1134

return ret;

1135

}

1136

1137

int

1138

rte_hash_add_key_data(const struct rte_hash *h, const void *key, void *data)

1139

{

1140

int ret;

1141

1142

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1143

1144

ret = __rte_hash_add_key_with_hash(h, key, rte_hash_hash(h, key), data);

Calling '__rte_hash_add_key_with_hash'

→

1145

if (ret >= 0)

1146

return 0;

1147

else

1148

return ret;

1149

}

1150

1151

/* Search one bucket to find the match key - uses rw lock */

1152

static inline int32_t

1153

search_one_bucket_l(const struct rte_hash *h, const void *key,

1154

uint16_t sig, void **data,

1155

const struct rte_hash_bucket *bkt)

1156

{

1157

int i;

1158

struct rte_hash_key *k, *keys = h->key_store;

1159

1160

for (i = 0; i < RTE_HASH_BUCKET_ENTRIES8; i++) {

1161

if (bkt->sig_current[i] == sig &&

1162

bkt->key_idx[i] != EMPTY_SLOT0) {

1163

k = (struct rte_hash_key *) ((char *)keys +

1164

bkt->key_idx[i] * h->key_entry_size);

1165

1166

if (rte_hash_cmp_eq(key, k->key, h) == 0) {

1167

if (data != NULL((void*)0))

1168

*data = k->pdata;

1169

1170

* Return index where key is stored,

1171

* subtracting the first dummy index

1172

1173

return bkt->key_idx[i] - 1;

1174

}

1175

}

1176

}

1177

return -1;

1178

}

1179

1180

/* Search one bucket to find the match key */

1181

static inline int32_t

1182

search_one_bucket_lf(const struct rte_hash *h, const void *key, uint16_t sig,

1183

void **data, const struct rte_hash_bucket *bkt)

1184

{

1185

int i;

1186

uint32_t key_idx;

1187

void *pdata;

1188

struct rte_hash_key *k, *keys = h->key_store;

1189

1190

for (i = 0; i < RTE_HASH_BUCKET_ENTRIES8; i++) {

1191

key_idx = __atomic_load_n(&bkt->key_idx[i],

1192

__ATOMIC_ACQUIRE2);

1193

if (bkt->sig_current[i] == sig && key_idx != EMPTY_SLOT0) {

1194

k = (struct rte_hash_key *) ((char *)keys +

1195

key_idx * h->key_entry_size);

1196

pdata = __atomic_load_n(&k->pdata,

1197

__ATOMIC_ACQUIRE2);

1198

1199

if (rte_hash_cmp_eq(key, k->key, h) == 0) {

1200

if (data != NULL((void*)0))

1201

*data = pdata;

1202

1203

* Return index where key is stored,

1204

* subtracting the first dummy index

1205

1206

return key_idx - 1;

1207

}

1208

}

1209

}

1210

return -1;

1211

}

1212

1213

static inline int32_t

1214

__rte_hash_lookup_with_hash_l(const struct rte_hash *h, const void *key,

1215

hash_sig_t sig, void **data)

1216

{

1217

uint32_t prim_bucket_idx, sec_bucket_idx;

1218

struct rte_hash_bucket *bkt, *cur_bkt;

1219

int ret;

1220

uint16_t short_sig;

1221

1222

short_sig = get_short_sig(sig);

1223

prim_bucket_idx = get_prim_bucket_index(h, sig);

1224

sec_bucket_idx = get_alt_bucket_index(h, prim_bucket_idx, short_sig);

1225

1226

bkt = &h->buckets[prim_bucket_idx];

1227

1228

__hash_rw_reader_lock(h);

1229

1230

/* Check if key is in primary location */

1231

ret = search_one_bucket_l(h, key, short_sig, data, bkt);

1232

if (ret != -1) {

1233

__hash_rw_reader_unlock(h);

1234

return ret;

1235

}

1236

/* Calculate secondary hash */

1237

bkt = &h->buckets[sec_bucket_idx];

1238

1239

/* Check if key is in secondary location */

1240

FOR_EACH_BUCKET(cur_bkt, bkt)for (cur_bkt = bkt; cur_bkt != ((void*)0); cur_bkt = cur_bkt->
next) {

1241

ret = search_one_bucket_l(h, key, short_sig,

1242

data, cur_bkt);

1243

if (ret != -1) {

1244

__hash_rw_reader_unlock(h);

1245

return ret;

1246

}

1247

}

1248

1249

__hash_rw_reader_unlock(h);

1250

1251

return -ENOENT2;

1252

}

1253

1254

static inline int32_t

1255

__rte_hash_lookup_with_hash_lf(const struct rte_hash *h, const void *key,

1256

hash_sig_t sig, void **data)

1257

{

1258

uint32_t prim_bucket_idx, sec_bucket_idx;

1259

struct rte_hash_bucket *bkt, *cur_bkt;

1260

uint32_t cnt_b, cnt_a;

1261

int ret;

1262

uint16_t short_sig;

1263

1264

short_sig = get_short_sig(sig);

1265

prim_bucket_idx = get_prim_bucket_index(h, sig);

1266

sec_bucket_idx = get_alt_bucket_index(h, prim_bucket_idx, short_sig);

1267

1268

do {

1269

/* Load the table change counter before the lookup

1270

* starts. Acquire semantics will make sure that

1271

* loads in search_one_bucket are not hoisted.

1272

1273

cnt_b = __atomic_load_n(h->tbl_chng_cnt,

1274

__ATOMIC_ACQUIRE2);

1275

1276

/* Check if key is in primary location */

1277

bkt = &h->buckets[prim_bucket_idx];

1278

ret = search_one_bucket_lf(h, key, short_sig, data, bkt);

1279

if (ret != -1) {

1280

__hash_rw_reader_unlock(h);

1281

return ret;

1282

}

1283

/* Calculate secondary hash */

1284

bkt = &h->buckets[sec_bucket_idx];

1285

1286

/* Check if key is in secondary location */

1287

FOR_EACH_BUCKET(cur_bkt, bkt)for (cur_bkt = bkt; cur_bkt != ((void*)0); cur_bkt = cur_bkt->
next) {

1288

ret = search_one_bucket_lf(h, key, short_sig,

1289

data, cur_bkt);

1290

if (ret != -1) {

1291

__hash_rw_reader_unlock(h);

1292

return ret;

1293

}

1294

}

1295

1296

/* The loads of sig_current in search_one_bucket

1297

* should not move below the load from tbl_chng_cnt.

1298

1299

__atomic_thread_fence(__ATOMIC_ACQUIRE2);

1300

/* Re-read the table change counter to check if the

1301

* table has changed during search. If yes, re-do

1302

* the search.

1303

* This load should not get hoisted. The load

1304

* acquires on cnt_b, key index in primary bucket

1305

* and key index in secondary bucket will make sure

1306

* that it does not get hoisted.

1307

1308

cnt_a = __atomic_load_n(h->tbl_chng_cnt,

1309

__ATOMIC_ACQUIRE2);

1310

} while (cnt_b != cnt_a);

1311

1312

return -ENOENT2;

1313

}

1314

1315

static inline int32_t

1316

__rte_hash_lookup_with_hash(const struct rte_hash *h, const void *key,

1317

hash_sig_t sig, void **data)

1318

{

1319

if (h->readwrite_concur_lf_support)

1320

return __rte_hash_lookup_with_hash_lf(h, key, sig, data);

1321

else

1322

return __rte_hash_lookup_with_hash_l(h, key, sig, data);

1323

}

1324

1325

int32_t

1326

rte_hash_lookup_with_hash(const struct rte_hash *h,

1327

const void *key, hash_sig_t sig)

1328

{

1329

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1330

return __rte_hash_lookup_with_hash(h, key, sig, NULL((void*)0));

1331

}

1332

1333

int32_t

1334

rte_hash_lookup(const struct rte_hash *h, const void *key)

1335

{

1336

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1337

return __rte_hash_lookup_with_hash(h, key, rte_hash_hash(h, key), NULL((void*)0));

1338

}

1339

1340

int

1341

rte_hash_lookup_with_hash_data(const struct rte_hash *h,

1342

const void *key, hash_sig_t sig, void **data)

1343

{

1344

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1345

return __rte_hash_lookup_with_hash(h, key, sig, data);

1346

}

1347

1348

int

1349

rte_hash_lookup_data(const struct rte_hash *h, const void *key, void **data)

1350

{

1351

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1352

return __rte_hash_lookup_with_hash(h, key, rte_hash_hash(h, key), data);

1353

}

1354

1355

static inline void

1356

remove_entry(const struct rte_hash *h, struct rte_hash_bucket *bkt, unsigned i)

1357

{

1358

unsigned lcore_id, n_slots;

1359

struct lcore_cache *cached_free_slots;

1360

1361

if (h->use_local_cache) {

1362

lcore_id = rte_lcore_id();

1363

cached_free_slots = &h->local_free_slots[lcore_id];

1364

/* Cache full, need to free it. */

1365

if (cached_free_slots->len == LCORE_CACHE_SIZE64) {

1366

/* Need to enqueue the free slots in global ring. */

1367

n_slots = rte_ring_mp_enqueue_burst(h->free_slots,

1368

cached_free_slots->objs,

1369

LCORE_CACHE_SIZE64, NULL((void*)0));

1370

ERR_IF_TRUE((n_slots == 0),

1371

"%s: could not enqueue free slots in global ring\n",

1372

__func__);

1373

cached_free_slots->len -= n_slots;

1374

}

1375

/* Put index of new free slot in cache. */

1376

cached_free_slots->objs[cached_free_slots->len] =

1377

(void *)((uintptr_t)bkt->key_idx[i]);

1378

cached_free_slots->len++;

1379

} else {

1380

rte_ring_sp_enqueue(h->free_slots,

1381

(void *)((uintptr_t)bkt->key_idx[i]));

1382

}

1383

}

1384

1385

/* Compact the linked list by moving key from last entry in linked list to the

1386

* empty slot.

1387

1388

static inline void

1389

__rte_hash_compact_ll(const struct rte_hash *h,

1390

struct rte_hash_bucket *cur_bkt, int pos) {

1391

int i;

1392

struct rte_hash_bucket *last_bkt;

1393

1394

if (!cur_bkt->next)

1395

return;

1396

1397

last_bkt = rte_hash_get_last_bkt(cur_bkt);

1398

1399

for (i = RTE_HASH_BUCKET_ENTRIES8 - 1; i >= 0; i--) {

1400

if (last_bkt->key_idx[i] != EMPTY_SLOT0) {

1401

cur_bkt->sig_current[pos] = last_bkt->sig_current[i];

1402

__atomic_store_n(&cur_bkt->key_idx[pos],

1403

last_bkt->key_idx[i],

1404

__ATOMIC_RELEASE3);

1405

if (h->readwrite_concur_lf_support) {

1406

/* Inform the readers that the table has changed

1407

* Since there is one writer, load acquire on

1408

* tbl_chng_cnt is not required.

1409

1410

__atomic_store_n(h->tbl_chng_cnt,

1411

*h->tbl_chng_cnt + 1,

1412

__ATOMIC_RELEASE3);

1413

/* The store to sig_current should

1414

* not move above the store to tbl_chng_cnt.

1415

1416

__atomic_thread_fence(__ATOMIC_RELEASE3);

1417

}

1418

last_bkt->sig_current[i] = NULL_SIGNATURE0;

1419

__atomic_store_n(&last_bkt->key_idx[i],

1420

EMPTY_SLOT0,

1421

__ATOMIC_RELEASE3);

1422

return;

1423

}

1424

}

1425

}

1426

1427

/* Search one bucket and remove the matched key.

1428

* Writer is expected to hold the lock while calling this

1429

* function.

1430

1431

static inline int32_t

1432

search_and_remove(const struct rte_hash *h, const void *key,

1433

struct rte_hash_bucket *bkt, uint16_t sig, int *pos)

1434

{

1435

struct rte_hash_key *k, *keys = h->key_store;

1436

unsigned int i;

1437

uint32_t key_idx;

1438

1439

/* Check if key is in bucket */

1440

for (i = 0; i < RTE_HASH_BUCKET_ENTRIES8; i++) {

1441

key_idx = __atomic_load_n(&bkt->key_idx[i],

1442

__ATOMIC_ACQUIRE2);

1443

if (bkt->sig_current[i] == sig && key_idx != EMPTY_SLOT0) {

1444

k = (struct rte_hash_key *) ((char *)keys +

1445

key_idx * h->key_entry_size);

1446

if (rte_hash_cmp_eq(key, k->key, h) == 0) {

1447

bkt->sig_current[i] = NULL_SIGNATURE0;

1448

/* Free the key store index if

1449

* no_free_on_del is disabled.

1450

1451

if (!h->no_free_on_del)

1452

remove_entry(h, bkt, i);

1453

1454

__atomic_store_n(&bkt->key_idx[i],

1455

EMPTY_SLOT0,

1456

__ATOMIC_RELEASE3);

1457

1458

*pos = i;

1459

1460

* Return index where key is stored,

1461

* subtracting the first dummy index

1462

1463

return key_idx - 1;

1464

}

1465

}

1466

}

1467

return -1;

1468

}

1469

1470

static inline int32_t

1471

__rte_hash_del_key_with_hash(const struct rte_hash *h, const void *key,

1472

hash_sig_t sig)

1473

{

1474

uint32_t prim_bucket_idx, sec_bucket_idx;

1475

struct rte_hash_bucket *prim_bkt, *sec_bkt, *prev_bkt, *last_bkt;

1476

struct rte_hash_bucket *cur_bkt;

1477

int pos;

1478

int32_t ret, i;

1479

uint16_t short_sig;

1480

1481

short_sig = get_short_sig(sig);

1482

prim_bucket_idx = get_prim_bucket_index(h, sig);

1483

sec_bucket_idx = get_alt_bucket_index(h, prim_bucket_idx, short_sig);

1484

prim_bkt = &h->buckets[prim_bucket_idx];

1485

1486

__hash_rw_writer_lock(h);

1487

/* look for key in primary bucket */

1488

ret = search_and_remove(h, key, prim_bkt, short_sig, &pos);

1489

if (ret != -1) {

1490

__rte_hash_compact_ll(h, prim_bkt, pos);

1491

last_bkt = prim_bkt->next;

1492

prev_bkt = prim_bkt;

1493

goto return_bkt;

1494

}

1495

1496

/* Calculate secondary hash */

1497

sec_bkt = &h->buckets[sec_bucket_idx];

1498

1499

FOR_EACH_BUCKET(cur_bkt, sec_bkt)for (cur_bkt = sec_bkt; cur_bkt != ((void*)0); cur_bkt = cur_bkt
->next) {

1500

ret = search_and_remove(h, key, cur_bkt, short_sig, &pos);

1501

if (ret != -1) {

1502

__rte_hash_compact_ll(h, cur_bkt, pos);

1503

last_bkt = sec_bkt->next;

1504

prev_bkt = sec_bkt;

1505

goto return_bkt;

1506

}

1507

}

1508

1509

__hash_rw_writer_unlock(h);

1510

return -ENOENT2;

1511

1512

/* Search last bucket to see if empty to be recycled */

1513

return_bkt:

1514

if (!last_bkt) {

1515

__hash_rw_writer_unlock(h);

1516

return ret;

1517

}

1518

while (last_bkt->next) {

1519

prev_bkt = last_bkt;

1520

last_bkt = last_bkt->next;

1521

}

1522

1523

for (i = 0; i < RTE_HASH_BUCKET_ENTRIES8; i++) {

1524

if (last_bkt->key_idx[i] != EMPTY_SLOT0)

1525

break;

1526

}

1527

/* found empty bucket and recycle */

1528

if (i == RTE_HASH_BUCKET_ENTRIES8) {

1529

prev_bkt->next = NULL((void*)0);

1530

uint32_t index = last_bkt - h->buckets_ext + 1;

1531

/* Recycle the empty bkt if

1532

* no_free_on_del is disabled.

1533

1534

if (h->no_free_on_del)

1535

/* Store index of an empty ext bkt to be recycled

1536

* on calling rte_hash_del_xxx APIs.

1537

* When lock free read-write concurrency is enabled,

1538

* an empty ext bkt cannot be put into free list

1539

* immediately (as readers might be using it still).

1540

* Hence freeing of the ext bkt is piggy-backed to

1541

* freeing of the key index.

1542

1543

h->ext_bkt_to_free[ret] = index;

1544

else

1545

rte_ring_sp_enqueue(h->free_ext_bkts, (void *)(uintptr_t)index);

1546

}

1547

__hash_rw_writer_unlock(h);

1548

return ret;

1549

}

1550

1551

int32_t

1552

rte_hash_del_key_with_hash(const struct rte_hash *h,

1553

const void *key, hash_sig_t sig)

1554

{

1555

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1556

return __rte_hash_del_key_with_hash(h, key, sig);

1557

}

1558

1559

int32_t

1560

rte_hash_del_key(const struct rte_hash *h, const void *key)

1561

{

1562

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1563

return __rte_hash_del_key_with_hash(h, key, rte_hash_hash(h, key));

1564

}

1565

1566

int

1567

rte_hash_get_key_with_position(const struct rte_hash *h, const int32_t position,

1568

void **key)

1569

{

1570

RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);

1571

1572

struct rte_hash_key *k, *keys = h->key_store;

1573

k = (struct rte_hash_key *) ((char *) keys + (position + 1) *

1574

h->key_entry_size);

1575

*key = k->key;

1576

1577

if (position !=

1578

__rte_hash_lookup_with_hash(h, *key, rte_hash_hash(h, *key),

1579

NULL((void*)0))) {

1580

return -ENOENT2;

1581

}

1582

1583

return 0;

1584

}

1585

1586

int __rte_experimental__attribute__((deprecated("Symbol is not yet part of stable ABI"
), section(".text.experimental")))

1587

rte_hash_free_key_with_position(const struct rte_hash *h,

1588

const int32_t position)

1589

{

1590

/* Key index where key is stored, adding the first dummy index */

1591

uint32_t key_idx = position + 1;

1592

1593

RETURN_IF_TRUE(((h == NULL) || (key_idx == EMPTY_SLOT)), -EINVAL);

1594

1595

unsigned int lcore_id, n_slots;

1596

struct lcore_cache *cached_free_slots;

1597

const uint32_t total_entries = h->use_local_cache ?

1598

h->entries + (RTE_MAX_LCORE128 - 1) * (LCORE_CACHE_SIZE64 - 1) + 1

1599

: h->entries + 1;

1600

1601

/* Out of bounds */

1602

if (key_idx >= total_entries)

1603

return -EINVAL22;

1604

if (h->ext_table_support && h->readwrite_concur_lf_support) {

1605

uint32_t index = h->ext_bkt_to_free[position];

1606

if (index) {

1607

/* Recycle empty ext bkt to free list. */

1608

rte_ring_sp_enqueue(h->free_ext_bkts, (void *)(uintptr_t)index);

1609

h->ext_bkt_to_free[position] = 0;

1610

}

1611

}

1612

1613

if (h->use_local_cache) {

1614

lcore_id = rte_lcore_id();

1615

cached_free_slots = &h->local_free_slots[lcore_id];

1616

/* Cache full, need to free it. */

1617

if (cached_free_slots->len == LCORE_CACHE_SIZE64) {

1618

/* Need to enqueue the free slots in global ring. */

1619

n_slots = rte_ring_mp_enqueue_burst(h->free_slots,

1620

cached_free_slots->objs,

1621

LCORE_CACHE_SIZE64, NULL((void*)0));

1622

RETURN_IF_TRUE((n_slots == 0), -EFAULT);

1623

cached_free_slots->len -= n_slots;

1624

}

1625

/* Put index of new free slot in cache. */

1626

cached_free_slots->objs[cached_free_slots->len] =

1627

(void *)((uintptr_t)key_idx);

1628

cached_free_slots->len++;

1629

} else {

1630

rte_ring_sp_enqueue(h->free_slots,

1631

(void *)((uintptr_t)key_idx));

1632

}

1633

1634

return 0;

1635

}

1636

1637

static inline void

1638

compare_signatures(uint32_t *prim_hash_matches, uint32_t *sec_hash_matches,

1639

const struct rte_hash_bucket *prim_bkt,

1640

const struct rte_hash_bucket *sec_bkt,

1641

uint16_t sig,

1642

enum rte_hash_sig_compare_function sig_cmp_fn)

1643

{

1644

unsigned int i;

1645

1646

/* For match mask the first bit of every two bits indicates the match */

1647

switch (sig_cmp_fn) {

1648

#if defined(RTE_MACHINE_CPUFLAG_SSE21)

1649

case RTE_HASH_COMPARE_SSE:

1650

/* Compare all signatures in the bucket */

1651

*prim_hash_matches = _mm_movemask_epi8(_mm_cmpeq_epi16(

1652

_mm_load_si128(

1653

(__m128i const *)prim_bkt->sig_current),

1654

_mm_set1_epi16(sig)));

1655

/* Compare all signatures in the bucket */

1656

*sec_hash_matches = _mm_movemask_epi8(_mm_cmpeq_epi16(

1657

_mm_load_si128(

1658

(__m128i const *)sec_bkt->sig_current),

1659

_mm_set1_epi16(sig)));

1660

break;

1661

#elif defined(RTE_MACHINE_CPUFLAG_NEON)

1662

case RTE_HASH_COMPARE_NEON: {

1663

uint16x8_t vmat, vsig, x;

1664

uint64x2_t x64;

1665

int16x8_t shift = {-15, -13, -11, -9, -7, -5, -3, -1};

1666

1667

vsig = vld1q_dup_u16((uint16_t const *)&sig);

1668

/* Compare all signatures in the primary bucket */

1669

vmat = vceqq_u16(vsig,

1670

vld1q_u16((uint16_t const *)prim_bkt->sig_current));

1671

x = vshlq_u16(vandq_u16(vmat, vdupq_n_u16(0x8000)), shift);

1672

x64 = vpaddlq_u32(vpaddlq_u16(x));

1673

*prim_hash_matches = (uint32_t)(vgetq_lane_u64(x64, 0) +

1674

vgetq_lane_u64(x64, 1));

1675

/* Compare all signatures in the secondary bucket */

1676

vmat = vceqq_u16(vsig,

1677

vld1q_u16((uint16_t const *)sec_bkt->sig_current));

1678

x = vshlq_u16(vandq_u16(vmat, vdupq_n_u16(0x8000)), shift);

1679

x64 = vpaddlq_u32(vpaddlq_u16(x));

1680

*sec_hash_matches = (uint32_t)(vgetq_lane_u64(x64, 0) +

1681

vgetq_lane_u64(x64, 1)); }

1682

break;

1683

#endif

1684

default:

1685

for (i = 0; i < RTE_HASH_BUCKET_ENTRIES8; i++) {

1686

*prim_hash_matches |=

1687

((sig == prim_bkt->sig_current[i]) << (i << 1));

1688

*sec_hash_matches |=

1689

((sig == sec_bkt->sig_current[i]) << (i << 1));

1690

}

1691

}

1692

}

1693

1694

#define PREFETCH_OFFSET4 4

1695

static inline void

1696

__rte_hash_lookup_bulk_l(const struct rte_hash *h, const void **keys,

1697

int32_t num_keys, int32_t *positions,

1698

uint64_t *hit_mask, void *data[])

1699

{

1700

uint64_t hits = 0;

1701

int32_t i;

1702

int32_t ret;

1703

uint32_t prim_hash[RTE_HASH_LOOKUP_BULK_MAX64];

1704

uint32_t prim_index[RTE_HASH_LOOKUP_BULK_MAX64];

1705

uint32_t sec_index[RTE_HASH_LOOKUP_BULK_MAX64];

1706

uint16_t sig[RTE_HASH_LOOKUP_BULK_MAX64];

1707

const struct rte_hash_bucket *primary_bkt[RTE_HASH_LOOKUP_BULK_MAX64];

1708

const struct rte_hash_bucket *secondary_bkt[RTE_HASH_LOOKUP_BULK_MAX64];

1709

uint32_t prim_hitmask[RTE_HASH_LOOKUP_BULK_MAX64] = {0};

1710

uint32_t sec_hitmask[RTE_HASH_LOOKUP_BULK_MAX64] = {0};

1711

struct rte_hash_bucket *cur_bkt, *next_bkt;

1712

1713

/* Prefetch first keys */

1714

for (i = 0; i < PREFETCH_OFFSET4 && i < num_keys; i++)

1715

rte_prefetch0(keys[i]);

1716

1717

1718

* Prefetch rest of the keys, calculate primary and

1719

* secondary bucket and prefetch them

1720

1721

for (i = 0; i < (num_keys - PREFETCH_OFFSET4); i++) {

1722

rte_prefetch0(keys[i + PREFETCH_OFFSET4]);

1723

1724

prim_hash[i] = rte_hash_hash(h, keys[i]);

1725

1726

sig[i] = get_short_sig(prim_hash[i]);

1727

prim_index[i] = get_prim_bucket_index(h, prim_hash[i]);

1728

sec_index[i] = get_alt_bucket_index(h, prim_index[i], sig[i]);

1729

1730

primary_bkt[i] = &h->buckets[prim_index[i]];

1731

secondary_bkt[i] = &h->buckets[sec_index[i]];

1732

1733

rte_prefetch0(primary_bkt[i]);

1734

rte_prefetch0(secondary_bkt[i]);

1735

}

1736

1737

/* Calculate and prefetch rest of the buckets */

1738

for (; i < num_keys; i++) {

1739

prim_hash[i] = rte_hash_hash(h, keys[i]);

1740

1741

sig[i] = get_short_sig(prim_hash[i]);

1742

prim_index[i] = get_prim_bucket_index(h, prim_hash[i]);

1743

sec_index[i] = get_alt_bucket_index(h, prim_index[i], sig[i]);

1744

1745

primary_bkt[i] = &h->buckets[prim_index[i]];

1746

secondary_bkt[i] = &h->buckets[sec_index[i]];

1747

1748

rte_prefetch0(primary_bkt[i]);

1749

rte_prefetch0(secondary_bkt[i]);

1750

}

1751

1752

__hash_rw_reader_lock(h);

1753

1754

/* Compare signatures and prefetch key slot of first hit */

1755

for (i = 0; i < num_keys; i++) {

1756

compare_signatures(&prim_hitmask[i], &sec_hitmask[i],

1757

primary_bkt[i], secondary_bkt[i],

1758

sig[i], h->sig_cmp_fn);

1759

1760

if (prim_hitmask[i]) {

1761

uint32_t first_hit =

1762

__builtin_ctzl(prim_hitmask[i])

1763

>> 1;

1764

uint32_t key_idx =

1765

primary_bkt[i]->key_idx[first_hit];

1766

const struct rte_hash_key *key_slot =

1767

(const struct rte_hash_key *)(

1768

(const char *)h->key_store +

1769

key_idx * h->key_entry_size);

1770

rte_prefetch0(key_slot);

1771

continue;

1772

}

1773

1774

if (sec_hitmask[i]) {

1775

uint32_t first_hit =

1776

__builtin_ctzl(sec_hitmask[i])

1777

>> 1;

1778

uint32_t key_idx =

1779

secondary_bkt[i]->key_idx[first_hit];

1780

const struct rte_hash_key *key_slot =

1781

(const struct rte_hash_key *)(

1782

(const char *)h->key_store +

1783

key_idx * h->key_entry_size);

1784

rte_prefetch0(key_slot);

1785

}

1786

}

1787

1788

/* Compare keys, first hits in primary first */

1789

for (i = 0; i < num_keys; i++) {

1790

positions[i] = -ENOENT2;

1791

while (prim_hitmask[i]) {

1792

uint32_t hit_index =

1793

__builtin_ctzl(prim_hitmask[i])

1794

>> 1;

1795

uint32_t key_idx =

1796

primary_bkt[i]->key_idx[hit_index];

1797

const struct rte_hash_key *key_slot =

1798

(const struct rte_hash_key *)(

1799

(const char *)h->key_store +

1800

key_idx * h->key_entry_size);

1801

1802

1803

* If key index is 0, do not compare key,

1804

* as it is checking the dummy slot

1805

1806

if (!!key_idx &

1807

!rte_hash_cmp_eq(

1808

key_slot->key, keys[i], h)) {

1809

if (data != NULL((void*)0))

1810

data[i] = key_slot->pdata;

1811

1812

hits |= 1ULL << i;

1813

positions[i] = key_idx - 1;

1814

goto next_key;

1815

}

1816

prim_hitmask[i] &= ~(3ULL << (hit_index << 1));

1817

}

1818

1819

while (sec_hitmask[i]) {

1820

uint32_t hit_index =

1821

__builtin_ctzl(sec_hitmask[i])

1822

>> 1;

1823

uint32_t key_idx =

1824

secondary_bkt[i]->key_idx[hit_index];

1825

const struct rte_hash_key *key_slot =

1826

(const struct rte_hash_key *)(

1827

(const char *)h->key_store +

1828

key_idx * h->key_entry_size);

1829

1830

1831

* If key index is 0, do not compare key,

1832

* as it is checking the dummy slot

1833

1834

1835

if (!!key_idx &

1836

!rte_hash_cmp_eq(

1837

key_slot->key, keys[i], h)) {

1838

if (data != NULL((void*)0))

1839

data[i] = key_slot->pdata;

1840

1841

hits |= 1ULL << i;

1842

positions[i] = key_idx - 1;

1843

goto next_key;

1844

}

1845

sec_hitmask[i] &= ~(3ULL << (hit_index << 1));

1846

}

1847

next_key:

1848

continue;

1849

}

1850

1851

/* all found, do not need to go through ext bkt */

1852

if ((hits == ((1ULL << num_keys) - 1)) || !h->ext_table_support) {

1853

if (hit_mask != NULL((void*)0))

1854

*hit_mask = hits;

1855

__hash_rw_reader_unlock(h);

1856

return;

1857

}

1858

1859

/* need to check ext buckets for match */

1860

for (i = 0; i < num_keys; i++) {

1861

if ((hits & (1ULL << i)) != 0)

1862

continue;

1863

next_bkt = secondary_bkt[i]->next;

1864

FOR_EACH_BUCKET(cur_bkt, next_bkt)for (cur_bkt = next_bkt; cur_bkt != ((void*)0); cur_bkt = cur_bkt
->next) {

1865

if (data != NULL((void*)0))

1866

ret = search_one_bucket_l(h, keys[i],

1867

sig[i], &data[i], cur_bkt);

1868

else

1869

ret = search_one_bucket_l(h, keys[i],

1870

sig[i], NULL((void*)0), cur_bkt);

1871

if (ret != -1) {

1872

positions[i] = ret;

1873

hits |= 1ULL << i;

1874

break;

1875

}

1876

}

1877

}

1878

1879

__hash_rw_reader_unlock(h);

1880

1881

if (hit_mask != NULL((void*)0))

1882

*hit_mask = hits;

1883

}

1884

1885

static inline void

1886

__rte_hash_lookup_bulk_lf(const struct rte_hash *h, const void **keys,

1887

int32_t num_keys, int32_t *positions,

1888

uint64_t *hit_mask, void *data[])

1889

{

1890

uint64_t hits = 0;

1891

int32_t i;

1892

int32_t ret;

1893

uint32_t prim_hash[RTE_HASH_LOOKUP_BULK_MAX64];

1894

uint32_t prim_index[RTE_HASH_LOOKUP_BULK_MAX64];

1895

uint32_t sec_index[RTE_HASH_LOOKUP_BULK_MAX64];

1896

uint16_t sig[RTE_HASH_LOOKUP_BULK_MAX64];

1897

const struct rte_hash_bucket *primary_bkt[RTE_HASH_LOOKUP_BULK_MAX64];

1898

const struct rte_hash_bucket *secondary_bkt[RTE_HASH_LOOKUP_BULK_MAX64];

1899

uint32_t prim_hitmask[RTE_HASH_LOOKUP_BULK_MAX64] = {0};

1900

uint32_t sec_hitmask[RTE_HASH_LOOKUP_BULK_MAX64] = {0};

1901

struct rte_hash_bucket *cur_bkt, *next_bkt;

1902

void *pdata[RTE_HASH_LOOKUP_BULK_MAX64];

1903

uint32_t cnt_b, cnt_a;

1904

1905

/* Prefetch first keys */

1906

for (i = 0; i < PREFETCH_OFFSET4 && i < num_keys; i++)

1907

rte_prefetch0(keys[i]);

1908

1909

1910

* Prefetch rest of the keys, calculate primary and

1911

* secondary bucket and prefetch them

1912

1913

for (i = 0; i < (num_keys - PREFETCH_OFFSET4); i++) {

1914

rte_prefetch0(keys[i + PREFETCH_OFFSET4]);

1915

1916

prim_hash[i] = rte_hash_hash(h, keys[i]);

1917

1918

sig[i] = get_short_sig(prim_hash[i]);

1919

prim_index[i] = get_prim_bucket_index(h, prim_hash[i]);

1920

sec_index[i] = get_alt_bucket_index(h, prim_index[i], sig[i]);

1921

1922

primary_bkt[i] = &h->buckets[prim_index[i]];

1923

secondary_bkt[i] = &h->buckets[sec_index[i]];

1924

1925

rte_prefetch0(primary_bkt[i]);

1926

rte_prefetch0(secondary_bkt[i]);

1927

}

1928

1929

/* Calculate and prefetch rest of the buckets */

1930

for (; i < num_keys; i++) {

1931

prim_hash[i] = rte_hash_hash(h, keys[i]);

1932

1933

sig[i] = get_short_sig(prim_hash[i]);

1934

prim_index[i] = get_prim_bucket_index(h, prim_hash[i]);

1935

sec_index[i] = get_alt_bucket_index(h, prim_index[i], sig[i]);

1936

1937

primary_bkt[i] = &h->buckets[prim_index[i]];

1938

secondary_bkt[i] = &h->buckets[sec_index[i]];

1939

1940

rte_prefetch0(primary_bkt[i]);

1941

rte_prefetch0(secondary_bkt[i]);

1942

}

1943

1944

for (i = 0; i < num_keys; i++)

1945

positions[i] = -ENOENT2;

1946

1947

do {

1948

/* Load the table change counter before the lookup

1949

* starts. Acquire semantics will make sure that

1950

* loads in compare_signatures are not hoisted.

1951

1952

cnt_b = __atomic_load_n(h->tbl_chng_cnt,

1953

__ATOMIC_ACQUIRE2);

1954

1955

/* Compare signatures and prefetch key slot of first hit */

1956

for (i = 0; i < num_keys; i++) {

1957

compare_signatures(&prim_hitmask[i], &sec_hitmask[i],

1958

primary_bkt[i], secondary_bkt[i],

1959

sig[i], h->sig_cmp_fn);

1960

1961

if (prim_hitmask[i]) {

1962

uint32_t first_hit =

1963

__builtin_ctzl(prim_hitmask[i])

1964

>> 1;

1965

uint32_t key_idx =

1966

primary_bkt[i]->key_idx[first_hit];

1967

const struct rte_hash_key *key_slot =

1968

(const struct rte_hash_key *)(

1969

(const char *)h->key_store +

1970

key_idx * h->key_entry_size);

1971

rte_prefetch0(key_slot);

1972

continue;

1973

}

1974

1975

if (sec_hitmask[i]) {

1976

uint32_t first_hit =

1977

__builtin_ctzl(sec_hitmask[i])

1978

>> 1;

1979

uint32_t key_idx =

1980

secondary_bkt[i]->key_idx[first_hit];

1981

const struct rte_hash_key *key_slot =

1982

(const struct rte_hash_key *)(

1983

(const char *)h->key_store +

1984

key_idx * h->key_entry_size);

1985

rte_prefetch0(key_slot);

1986

}

1987

}

1988

1989

/* Compare keys, first hits in primary first */

1990

for (i = 0; i < num_keys; i++) {

1991

while (prim_hitmask[i]) {

1992

uint32_t hit_index =

1993

__builtin_ctzl(prim_hitmask[i])

1994

>> 1;

1995

uint32_t key_idx =

1996

__atomic_load_n(

1997

&primary_bkt[i]->key_idx[hit_index],

1998

__ATOMIC_ACQUIRE2);

1999

const struct rte_hash_key *key_slot =

2000

(const struct rte_hash_key *)(

2001

(const char *)h->key_store +

2002

key_idx * h->key_entry_size);

2003

2004

if (key_idx != EMPTY_SLOT0)

2005

pdata[i] = __atomic_load_n(

2006

&key_slot->pdata,

2007

__ATOMIC_ACQUIRE2);

2008

2009

* If key index is 0, do not compare key,

2010

* as it is checking the dummy slot

2011

2012

if (!!key_idx &

2013

!rte_hash_cmp_eq(

2014

key_slot->key, keys[i], h)) {

2015

if (data != NULL((void*)0))

2016

data[i] = pdata[i];

2017

2018

hits |= 1ULL << i;

2019

positions[i] = key_idx - 1;

2020

goto next_key;

2021

}

2022

prim_hitmask[i] &= ~(3ULL << (hit_index << 1));

2023

}

2024

2025

while (sec_hitmask[i]) {

2026

uint32_t hit_index =

2027

__builtin_ctzl(sec_hitmask[i])

2028

>> 1;

2029

uint32_t key_idx =

2030

__atomic_load_n(

2031

&secondary_bkt[i]->key_idx[hit_index],

2032

__ATOMIC_ACQUIRE2);

2033

const struct rte_hash_key *key_slot =

2034

(const struct rte_hash_key *)(

2035

(const char *)h->key_store +

2036

key_idx * h->key_entry_size);

2037

2038

if (key_idx != EMPTY_SLOT0)

2039

pdata[i] = __atomic_load_n(

2040

&key_slot->pdata,

2041

__ATOMIC_ACQUIRE2);

2042

2043

* If key index is 0, do not compare key,

2044

* as it is checking the dummy slot

2045

2046

2047

if (!!key_idx &

2048

!rte_hash_cmp_eq(

2049

key_slot->key, keys[i], h)) {

2050

if (data != NULL((void*)0))

2051

data[i] = pdata[i];

2052

2053

hits |= 1ULL << i;

2054

positions[i] = key_idx - 1;

2055

goto next_key;

2056

}

2057

sec_hitmask[i] &= ~(3ULL << (hit_index << 1));

2058

}

2059

next_key:

2060

continue;

2061

}

2062

2063

/* all found, do not need to go through ext bkt */

2064

if (hits == ((1ULL << num_keys) - 1)) {

2065

if (hit_mask != NULL((void*)0))

2066

*hit_mask = hits;

2067

return;

2068

}

2069

/* need to check ext buckets for match */

2070

if (h->ext_table_support) {

2071

for (i = 0; i < num_keys; i++) {

2072

if ((hits & (1ULL << i)) != 0)

2073

continue;

2074

next_bkt = secondary_bkt[i]->next;

2075

FOR_EACH_BUCKET(cur_bkt, next_bkt)for (cur_bkt = next_bkt; cur_bkt != ((void*)0); cur_bkt = cur_bkt
->next) {

2076

if (data != NULL((void*)0))

2077

ret = search_one_bucket_lf(h,

2078

keys[i], sig[i],

2079

&data[i], cur_bkt);

2080

else

2081

ret = search_one_bucket_lf(h,

2082

keys[i], sig[i],

2083

NULL((void*)0), cur_bkt);

2084

if (ret != -1) {

2085

positions[i] = ret;

2086

hits |= 1ULL << i;

2087

break;

2088

}

2089

}

2090

}

2091

}

2092

/* The loads of sig_current in compare_signatures

2093

* should not move below the load from tbl_chng_cnt.

2094

2095

__atomic_thread_fence(__ATOMIC_ACQUIRE2);

2096

/* Re-read the table change counter to check if the

2097

* table has changed during search. If yes, re-do

2098

* the search.

2099

* This load should not get hoisted. The load

2100

* acquires on cnt_b, primary key index and secondary

2101

* key index will make sure that it does not get

2102

* hoisted.

2103

2104

cnt_a = __atomic_load_n(h->tbl_chng_cnt,

2105

__ATOMIC_ACQUIRE2);

2106

} while (cnt_b != cnt_a);

2107

2108

if (hit_mask != NULL((void*)0))

2109

*hit_mask = hits;

2110

}

2111

2112

static inline void

2113

__rte_hash_lookup_bulk(const struct rte_hash *h, const void **keys,

2114

int32_t num_keys, int32_t *positions,

2115

uint64_t *hit_mask, void *data[])

2116

{

2117

if (h->readwrite_concur_lf_support)

2118

__rte_hash_lookup_bulk_lf(h, keys, num_keys, positions,

2119

hit_mask, data);

2120

else

2121

__rte_hash_lookup_bulk_l(h, keys, num_keys, positions,

2122

hit_mask, data);

2123

}

2124

2125

int

2126

rte_hash_lookup_bulk(const struct rte_hash *h, const void **keys,

2127

uint32_t num_keys, int32_t *positions)

2128

{

2129

RETURN_IF_TRUE(((h == NULL) || (keys == NULL) || (num_keys == 0) ||

2130

(num_keys > RTE_HASH_LOOKUP_BULK_MAX) ||

2131

(positions == NULL)), -EINVAL);

2132

2133

__rte_hash_lookup_bulk(h, keys, num_keys, positions, NULL((void*)0), NULL((void*)0));

2134

return 0;

2135

}

2136

2137

int

2138

rte_hash_lookup_bulk_data(const struct rte_hash *h, const void **keys,

2139

uint32_t num_keys, uint64_t *hit_mask, void *data[])

2140

{

2141

RETURN_IF_TRUE(((h == NULL) || (keys == NULL) || (num_keys == 0) ||

2142

(num_keys > RTE_HASH_LOOKUP_BULK_MAX) ||

2143

(hit_mask == NULL)), -EINVAL);

2144

2145

int32_t positions[num_keys];

2146

2147

__rte_hash_lookup_bulk(h, keys, num_keys, positions, hit_mask, data);

2148

2149

/* Return number of hits */

2150

return __builtin_popcountl(*hit_mask);

2151

}

2152

2153

int32_t

2154

rte_hash_iterate(const struct rte_hash *h, const void **key, void **data, uint32_t *next)

2155

{

2156

uint32_t bucket_idx, idx, position;

2157

struct rte_hash_key *next_key;

2158

2159

RETURN_IF_TRUE(((h == NULL) || (next == NULL)), -EINVAL);

2160

2161

const uint32_t total_entries_main = h->num_buckets *

2162

RTE_HASH_BUCKET_ENTRIES8;

2163

const uint32_t total_entries = total_entries_main << 1;

2164

2165

/* Out of bounds of all buckets (both main table and ext table) */

2166

if (*next >= total_entries_main)

2167

goto extend_table;

2168

2169

/* Calculate bucket and index of current iterator */

2170

bucket_idx = *next / RTE_HASH_BUCKET_ENTRIES8;

2171

idx = *next % RTE_HASH_BUCKET_ENTRIES8;

2172

2173

/* If current position is empty, go to the next one */

2174

while ((position = __atomic_load_n(&h->buckets[bucket_idx].key_idx[idx],

2175

__ATOMIC_ACQUIRE2)) == EMPTY_SLOT0) {

2176

(*next)++;

2177

/* End of table */

2178

if (*next == total_entries_main)

2179

goto extend_table;

2180

bucket_idx = *next / RTE_HASH_BUCKET_ENTRIES8;

2181

idx = *next % RTE_HASH_BUCKET_ENTRIES8;

2182

}

2183

2184

__hash_rw_reader_lock(h);

2185

next_key = (struct rte_hash_key *) ((char *)h->key_store +

2186

position * h->key_entry_size);

2187

/* Return key and data */

2188

*key = next_key->key;

2189

*data = next_key->pdata;

2190

2191

__hash_rw_reader_unlock(h);

2192

2193

/* Increment iterator */

2194

(*next)++;

2195

2196

return position - 1;

2197

2198

/* Begin to iterate extendable buckets */

2199

extend_table:

2200

/* Out of total bound or if ext bucket feature is not enabled */

2201

if (*next >= total_entries || !h->ext_table_support)

2202

return -ENOENT2;

2203

2204

bucket_idx = (*next - total_entries_main) / RTE_HASH_BUCKET_ENTRIES8;

2205

idx = (*next - total_entries_main) % RTE_HASH_BUCKET_ENTRIES8;

2206

2207

while ((position = h->buckets_ext[bucket_idx].key_idx[idx]) == EMPTY_SLOT0) {

2208

(*next)++;

2209

if (*next == total_entries)

2210

return -ENOENT2;

2211

bucket_idx = (*next - total_entries_main) /

2212

RTE_HASH_BUCKET_ENTRIES8;

2213

idx = (*next - total_entries_main) % RTE_HASH_BUCKET_ENTRIES8;

2214

}

2215

__hash_rw_reader_lock(h);

2216

next_key = (struct rte_hash_key *) ((char *)h->key_store +

2217

position * h->key_entry_size);

2218

/* Return key and data */

2219

*key = next_key->key;

2220

*data = next_key->pdata;

2221

2222

__hash_rw_reader_unlock(h);

2223

2224

/* Increment iterator */

2225

(*next)++;

2226

return position - 1;

2227

}