From: Stephen Hemminger <stephen@networkplumber.org>
To: dev@dpdk.org
Cc: Stephen Hemminger <stephen@networkplumber.org>,
Wathsala Vithanage <wathsala.vithanage@arm.com>,
Yipeng Wang <yipeng1.wang@intel.com>,
Sameh Gobriel <sameh.gobriel@intel.com>,
Bruce Richardson <bruce.richardson@intel.com>,
Vladimir Medvedkin <vladimir.medvedkin@intel.com>
Subject: [RFC 2/3] hash: reduce architecture special cases
Date: Thu, 21 Aug 2025 13:35:09 -0700 [thread overview]
Message-ID: <20250821203646.133506-3-stephen@networkplumber.org> (raw)
In-Reply-To: <20250821203646.133506-1-stephen@networkplumber.org>
Make comparison of power of 2 sizes compatible across platforms.
Keep the special case code for 16 bytes for x86 and arm64 but
also add simple xor for others.
Need to make rte_hash_k32_cmp_eq() exposed because ip_frag
code poaches it.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
lib/hash/rte_cmp_arm64.h | 52 ----------------------
lib/hash/rte_cmp_x86.h | 56 +-----------------------
lib/hash/rte_cuckoo_hash.c | 90 +++++++++++++++++++++++++++++++++-----
3 files changed, 80 insertions(+), 118 deletions(-)
diff --git a/lib/hash/rte_cmp_arm64.h b/lib/hash/rte_cmp_arm64.h
index a3e85635eb..c7c56526d0 100644
--- a/lib/hash/rte_cmp_arm64.h
+++ b/lib/hash/rte_cmp_arm64.h
@@ -31,55 +31,3 @@ rte_hash_k32_cmp_eq(const void *key1, const void *key2, size_t key_len)
rte_hash_k16_cmp_eq((const char *) key1 + 16,
(const char *) key2 + 16, key_len);
}
-
-static inline int
-rte_hash_k48_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
- rte_hash_k16_cmp_eq((const char *) key1 + 16,
- (const char *) key2 + 16, key_len) ||
- rte_hash_k16_cmp_eq((const char *) key1 + 32,
- (const char *) key2 + 32, key_len);
-}
-
-static inline int
-rte_hash_k64_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k32_cmp_eq(key1, key2, key_len) ||
- rte_hash_k32_cmp_eq((const char *) key1 + 32,
- (const char *) key2 + 32, key_len);
-}
-
-static inline int
-rte_hash_k80_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
- rte_hash_k16_cmp_eq((const char *) key1 + 64,
- (const char *) key2 + 64, key_len);
-}
-
-static inline int
-rte_hash_k96_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
- rte_hash_k32_cmp_eq((const char *) key1 + 64,
- (const char *) key2 + 64, key_len);
-}
-
-static inline int
-rte_hash_k112_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
- rte_hash_k32_cmp_eq((const char *) key1 + 64,
- (const char *) key2 + 64, key_len) ||
- rte_hash_k16_cmp_eq((const char *) key1 + 96,
- (const char *) key2 + 96, key_len);
-}
-
-static inline int
-rte_hash_k128_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
- rte_hash_k64_cmp_eq((const char *) key1 + 64,
- (const char *) key2 + 64, key_len);
-}
diff --git a/lib/hash/rte_cmp_x86.h b/lib/hash/rte_cmp_x86.h
index ddfbef462f..62ac320b25 100644
--- a/lib/hash/rte_cmp_x86.h
+++ b/lib/hash/rte_cmp_x86.h
@@ -19,58 +19,6 @@ static inline int
rte_hash_k32_cmp_eq(const void *key1, const void *key2, size_t key_len)
{
return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
- rte_hash_k16_cmp_eq((const char *) key1 + 16,
- (const char *) key2 + 16, key_len);
-}
-
-static inline int
-rte_hash_k48_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
- rte_hash_k16_cmp_eq((const char *) key1 + 16,
- (const char *) key2 + 16, key_len) ||
- rte_hash_k16_cmp_eq((const char *) key1 + 32,
- (const char *) key2 + 32, key_len);
-}
-
-static inline int
-rte_hash_k64_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k32_cmp_eq(key1, key2, key_len) ||
- rte_hash_k32_cmp_eq((const char *) key1 + 32,
- (const char *) key2 + 32, key_len);
-}
-
-static inline int
-rte_hash_k80_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
- rte_hash_k16_cmp_eq((const char *) key1 + 64,
- (const char *) key2 + 64, key_len);
-}
-
-static inline int
-rte_hash_k96_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
- rte_hash_k32_cmp_eq((const char *) key1 + 64,
- (const char *) key2 + 64, key_len);
-}
-
-static inline int
-rte_hash_k112_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
- rte_hash_k32_cmp_eq((const char *) key1 + 64,
- (const char *) key2 + 64, key_len) ||
- rte_hash_k16_cmp_eq((const char *) key1 + 96,
- (const char *) key2 + 96, key_len);
-}
-
-static inline int
-rte_hash_k128_cmp_eq(const void *key1, const void *key2, size_t key_len)
-{
- return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
- rte_hash_k64_cmp_eq((const char *) key1 + 64,
- (const char *) key2 + 64, key_len);
+ rte_hash_k16_cmp_eq((const uint8_t *) key1 + 16,
+ (const uint8_t *) key2 + 16, key_len);
}
diff --git a/lib/hash/rte_cuckoo_hash.c b/lib/hash/rte_cuckoo_hash.c
index 619fe0c691..3212695d92 100644
--- a/lib/hash/rte_cuckoo_hash.c
+++ b/lib/hash/rte_cuckoo_hash.c
@@ -42,14 +42,6 @@ RTE_LOG_REGISTER_DEFAULT(hash_logtype, INFO);
#define RETURN_IF_TRUE(cond, retval)
#endif
-#if defined(RTE_ARCH_X86)
-#include "rte_cmp_x86.h"
-#endif
-
-#if defined(RTE_ARCH_ARM64)
-#include "rte_cmp_arm64.h"
-#endif
-
/*
* All different options to select a key compare function,
* based on the key size and custom function.
@@ -57,7 +49,6 @@ RTE_LOG_REGISTER_DEFAULT(hash_logtype, INFO);
*/
enum cmp_jump_table_case {
KEY_CUSTOM = 0,
-#if defined(RTE_ARCH_X86) || defined(RTE_ARCH_ARM64)
KEY_16_BYTES,
KEY_32_BYTES,
KEY_48_BYTES,
@@ -66,11 +57,88 @@ enum cmp_jump_table_case {
KEY_96_BYTES,
KEY_112_BYTES,
KEY_128_BYTES,
-#endif
KEY_OTHER_BYTES,
NUM_KEY_CMP_CASES,
};
+
+#if defined(RTE_ARCH_X86)
+#include "rte_cmp_x86.h"
+#elif defined(RTE_ARCH_ARM64)
+#include "rte_cmp_arm64.h"
+#else
+
+static inline int
+rte_hash_k16_cmp_eq(const void *key1, const void *key2, size_t key_len __rte_unused)
+{
+ const uint64_t *k1 = key1;
+ const uint64_t *k2 = key2;
+
+ return (k1[0] ^ k2[0]) | (k1[1] ^ k2[1]);
+}
+
+static inline int
+rte_hash_k32_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k16_cmp_eq((const uint8_t *) key1 + 16,
+ (const uint8_t *) key2 + 16, key_len);
+}
+#endif
+
+
+static inline int
+rte_hash_k48_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k16_cmp_eq((const uint8_t *) key1 + 16,
+ (const uint8_t *) key2 + 16, key_len) ||
+ rte_hash_k16_cmp_eq((const uint8_t *) key1 + 32,
+ (const uint8_t *) key2 + 32, key_len);
+}
+
+static inline int
+rte_hash_k64_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k32_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k32_cmp_eq((const uint8_t *) key1 + 32,
+ (const uint8_t *) key2 + 32, key_len);
+}
+
+static inline int
+rte_hash_k80_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k16_cmp_eq((const uint8_t *) key1 + 64,
+ (const uint8_t *) key2 + 64, key_len);
+}
+
+static inline int
+rte_hash_k96_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k32_cmp_eq((const uint8_t *) key1 + 64,
+ (const uint8_t *) key2 + 64, key_len);
+}
+
+static inline int
+rte_hash_k112_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k32_cmp_eq((const uint8_t *) key1 + 64,
+ (const uint8_t *) key2 + 64, key_len) ||
+ rte_hash_k16_cmp_eq((const uint8_t *) key1 + 96,
+ (const uint8_t *) key2 + 96, key_len);
+}
+
+static inline int
+rte_hash_k128_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k64_cmp_eq((const uint8_t *) key1 + 64,
+ (const uint8_t *) key2 + 64, key_len);
+}
+
/* Enum used to select the implementation of the signature comparison function to use
* eg: a system supporting SVE might want to use a NEON or scalar implementation.
*/
@@ -160,7 +228,6 @@ void rte_hash_set_cmp_func(struct rte_hash *h, rte_hash_cmp_eq_t func)
*/
static const rte_hash_cmp_eq_t cmp_jump_table[NUM_KEY_CMP_CASES] = {
[KEY_CUSTOM] = NULL,
-#if defined(RTE_ARCH_X86) || defined(RTE_ARCH_ARM64)
[KEY_16_BYTES] = rte_hash_k16_cmp_eq,
[KEY_32_BYTES] = rte_hash_k32_cmp_eq,
[KEY_48_BYTES] = rte_hash_k48_cmp_eq,
@@ -169,7 +236,6 @@ static const rte_hash_cmp_eq_t cmp_jump_table[NUM_KEY_CMP_CASES] = {
[KEY_96_BYTES] = rte_hash_k96_cmp_eq,
[KEY_112_BYTES] = rte_hash_k112_cmp_eq,
[KEY_128_BYTES] = rte_hash_k128_cmp_eq,
-#endif
[KEY_OTHER_BYTES] = memcmp,
};
--
2.47.2
next prev parent reply other threads:[~2025-08-21 20:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-21 20:35 [RFC 0/3] hash: optimize compare logic Stephen Hemminger
2025-08-21 20:35 ` [RFC 1/3] hash: move table of hash compare functions out of header Stephen Hemminger
2025-08-21 20:35 ` Stephen Hemminger [this message]
2025-08-21 20:35 ` [RFC 3/3] hash: add support for common small key sizes Stephen Hemminger
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