[dpdk-dev] [PATCH v2] examples/l3fwd: em: use hw accelerated crc hash function for arm64

[Hemant Agrawal]

if machine level CRC extension are available, offload the
hash to machine provide functions e.g. armv8-a CRC extensions
support it

Signed-off-by: Hemant Agrawal <hemant.agrawal at nxp.com>
Reviewed-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
---
 examples/l3fwd/l3fwd_em.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/examples/l3fwd/l3fwd_em.c b/examples/l3fwd/l3fwd_em.c
index 89a68e6..d92d0aa 100644
--- a/examples/l3fwd/l3fwd_em.c
+++ b/examples/l3fwd/l3fwd_em.c
@@ -57,13 +57,17 @@

 #include "l3fwd.h"

-#ifdef RTE_MACHINE_CPUFLAG_SSE4_2
+#if defined(RTE_MACHINE_CPUFLAG_SSE4_2) && defined(RTE_MACHINE_CPUFLAG_CRC32)
+#define EM_HASH_CRC 1
+#endif
+
+#ifdef EM_HASH_CRC
 #include <rte_hash_crc.h>
 #define DEFAULT_HASH_FUNC       rte_hash_crc
 #else
 #include <rte_jhash.h>
 #define DEFAULT_HASH_FUNC       rte_jhash
-#endif /* RTE_MACHINE_CPUFLAG_SSE4_2 */
+#endif

 #define IPV6_ADDR_LEN 16

@@ -168,17 +172,17 @@ ipv4_hash_crc(const void *data, __rte_unused uint32_t 
data_len,
        t = k->proto;
        p = (const uint32_t *)&k->port_src;

-#ifdef RTE_MACHINE_CPUFLAG_SSE4_2
+#ifdef EM_HASH_CRC
        init_val = rte_hash_crc_4byte(t, init_val);
        init_val = rte_hash_crc_4byte(k->ip_src, init_val);
        init_val = rte_hash_crc_4byte(k->ip_dst, init_val);
        init_val = rte_hash_crc_4byte(*p, init_val);
-#else /* RTE_MACHINE_CPUFLAG_SSE4_2 */
+#else
        init_val = rte_jhash_1word(t, init_val);
        init_val = rte_jhash_1word(k->ip_src, init_val);
        init_val = rte_jhash_1word(k->ip_dst, init_val);
        init_val = rte_jhash_1word(*p, init_val);
-#endif /* RTE_MACHINE_CPUFLAG_SSE4_2 */
+#endif

        return init_val;
 }
@@ -190,16 +194,16 @@ ipv6_hash_crc(const void *data, __rte_unused uint32_t 
data_len,
        const union ipv6_5tuple_host *k;
        uint32_t t;
        const uint32_t *p;
-#ifdef RTE_MACHINE_CPUFLAG_SSE4_2
+#ifdef EM_HASH_CRC
        const uint32_t  *ip_src0, *ip_src1, *ip_src2, *ip_src3;
        const uint32_t  *ip_dst0, *ip_dst1, *ip_dst2, *ip_dst3;
-#endif /* RTE_MACHINE_CPUFLAG_SSE4_2 */
+#endif

        k = data;
        t = k->proto;
        p = (const uint32_t *)&k->port_src;

-#ifdef RTE_MACHINE_CPUFLAG_SSE4_2
+#ifdef EM_HASH_CRC
        ip_src0 = (const uint32_t *) k->ip_src;
        ip_src1 = (const uint32_t *)(k->ip_src+4);
        ip_src2 = (const uint32_t *)(k->ip_src+8);
@@ -218,14 +222,14 @@ ipv6_hash_crc(const void *data, __rte_unused uint32_t 
data_len,
        init_val = rte_hash_crc_4byte(*ip_dst2, init_val);
        init_val = rte_hash_crc_4byte(*ip_dst3, init_val);
        init_val = rte_hash_crc_4byte(*p, init_val);
-#else /* RTE_MACHINE_CPUFLAG_SSE4_2 */
+#else
        init_val = rte_jhash_1word(t, init_val);
        init_val = rte_jhash(k->ip_src,
                        sizeof(uint8_t) * IPV6_ADDR_LEN, init_val);
        init_val = rte_jhash(k->ip_dst,
                        sizeof(uint8_t) * IPV6_ADDR_LEN, init_val);
        init_val = rte_jhash_1word(*p, init_val);
-#endif /* RTE_MACHINE_CPUFLAG_SSE4_2 */
+#endif
        return init_val;
 }

-- 
1.9.1