#include <stdint.h>
#include <string.h>
#include <limits.h>
#include <rte_config.h>
#include <rte_log.h>
#include <rte_byteorder.h>
Go to the source code of this file.
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| static void | rte_jhash_2hashes (const void *key, uint32_t length, uint32_t *pc, uint32_t *pb) |
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| static void | rte_jhash_32b_2hashes (const uint32_t *k, uint32_t length, uint32_t *pc, uint32_t *pb) |
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| static uint32_t | rte_jhash (const void *key, uint32_t length, uint32_t initval) |
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| static uint32_t | rte_jhash_32b (const uint32_t *k, uint32_t length, uint32_t initval) |
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| static uint32_t | rte_jhash_3words (uint32_t a, uint32_t b, uint32_t c, uint32_t initval) |
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| static uint32_t | rte_jhash_2words (uint32_t a, uint32_t b, uint32_t initval) |
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| static uint32_t | rte_jhash_1word (uint32_t a, uint32_t initval) |
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jhash functions.
Definition in file rte_jhash.h.
◆ RTE_JHASH_GOLDEN_RATIO
| #define RTE_JHASH_GOLDEN_RATIO 0xdeadbeef |
The golden ratio: an arbitrary value.
Definition at line 68 of file rte_jhash.h.
◆ rte_jhash_2hashes()
| static void rte_jhash_2hashes |
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const void * |
key, |
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uint32_t |
length, |
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uint32_t * |
pc, |
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uint32_t * |
pb |
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inlinestatic |
Same as rte_jhash, but takes two seeds and return two uint32_ts. pc and pb must be non-null, and *pc and *pb must both be initialized with seeds. If you pass in (*pb)=0, the output (*pc) will be the same as the return value from rte_jhash.
- Parameters
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| key | Key to calculate hash of. |
| length | Length of key in bytes. |
| pc | IN: seed OUT: primary hash value. |
| pb | IN: second seed OUT: secondary hash value. |
Definition at line 236 of file rte_jhash.h.
◆ rte_jhash_32b_2hashes()
| static void rte_jhash_32b_2hashes |
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const uint32_t * |
k, |
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uint32_t |
length, |
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uint32_t * |
pc, |
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uint32_t * |
pb |
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inlinestatic |
Same as rte_jhash_32b, but takes two seeds and return two uint32_ts. pc and pb must be non-null, and *pc and *pb must both be initialized with seeds. If you pass in (*pb)=0, the output (*pc) will be the same as the return value from rte_jhash_32b.
- Parameters
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| k | Key to calculate hash of. |
| length | Length of key in units of 4 bytes. |
| pc | IN: seed OUT: primary hash value. |
| pb | IN: second seed OUT: secondary hash value. |
Definition at line 257 of file rte_jhash.h.
◆ rte_jhash()
| static uint32_t rte_jhash |
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const void * |
key, |
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uint32_t |
length, |
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uint32_t |
initval |
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inlinestatic |
The most generic version, hashes an arbitrary sequence of bytes. No alignment or length assumptions are made about the input key. For keys not aligned to four byte boundaries or a multiple of four bytes in length, the memory region just after may be read (but not used in the computation). This may cross a page boundary.
- Parameters
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| key | Key to calculate hash of. |
| length | Length of key in bytes. |
| initval | Initialising value of hash. |
- Returns
- Calculated hash value.
- Examples
- examples/ipsec-secgw/ipsec-secgw.c, and examples/l3fwd/l3fwd_em.c.
Definition at line 280 of file rte_jhash.h.
◆ rte_jhash_32b()
| static uint32_t rte_jhash_32b |
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const uint32_t * |
k, |
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uint32_t |
length, |
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uint32_t |
initval |
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inlinestatic |
A special optimized version that handles 1 or more of uint32_ts. The length parameter here is the number of uint32_ts in the key.
- Parameters
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| k | Key to calculate hash of. |
| length | Length of key in units of 4 bytes. |
| initval | Initialising value of hash. |
- Returns
- Calculated hash value.
Definition at line 303 of file rte_jhash.h.
◆ rte_jhash_3words()
| static uint32_t rte_jhash_3words |
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uint32_t |
a, |
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uint32_t |
b, |
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uint32_t |
c, |
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uint32_t |
initval |
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inlinestatic |
A special ultra-optimized versions that knows it is hashing exactly 3 words.
- Parameters
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| a | First word to calculate hash of. |
| b | Second word to calculate hash of. |
| c | Third word to calculate hash of. |
| initval | Initialising value of hash. |
- Returns
- Calculated hash value.
Definition at line 340 of file rte_jhash.h.
◆ rte_jhash_2words()
| static uint32_t rte_jhash_2words |
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uint32_t |
a, |
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uint32_t |
b, |
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uint32_t |
initval |
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inlinestatic |
A special ultra-optimized versions that knows it is hashing exactly 2 words.
- Parameters
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| a | First word to calculate hash of. |
| b | Second word to calculate hash of. |
| initval | Initialising value of hash. |
- Returns
- Calculated hash value.
Definition at line 359 of file rte_jhash.h.
◆ rte_jhash_1word()
| static uint32_t rte_jhash_1word |
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uint32_t |
a, |
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uint32_t |
initval |
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inlinestatic |
A special ultra-optimized versions that knows it is hashing exactly 1 word.
- Parameters
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| a | Word to calculate hash of. |
| initval | Initialising value of hash. |
- Returns
- Calculated hash value.
- Examples
- examples/l3fwd/l3fwd_em.c.
Definition at line 376 of file rte_jhash.h.
