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authorDamjan Marion <damarion@cisco.com>2021-11-12 16:00:24 +0100
committerFlorin Coras <florin.coras@gmail.com>2021-11-12 16:13:08 +0000
commit271daab9677a5c611b203379fc6fb9022f53f09c (patch)
tree80c4fe8cdb63ad6d1b3f92b5a4ec0413d5db3fe7 /src/vnet/hash
parent3108399fcf3e94b47a0b23f02fea3b39ab8be637 (diff)
hash: refactor crc32_5tuple
Type: improvement Change-Id: I31cae2367e2ec7fc89991ca0df994a73da93aaed Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vnet/hash')
-rw-r--r--src/vnet/hash/crc32_5tuple.c117
1 files changed, 39 insertions, 78 deletions
diff --git a/src/vnet/hash/crc32_5tuple.c b/src/vnet/hash/crc32_5tuple.c
index 0a05b80d00f..2cdb19440c6 100644
--- a/src/vnet/hash/crc32_5tuple.c
+++ b/src/vnet/hash/crc32_5tuple.c
@@ -7,32 +7,11 @@
#include <vnet/ethernet/ethernet.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/ip/ip6_packet.h>
-#include <vnet/ip/ip46_address.h>
-#include <vnet/udp/udp_packet.h>
#include <vnet/hash/hash.h>
#include <vppinfra/crc32.h>
#ifdef clib_crc32c_uses_intrinsics
-typedef union
-{
- struct
- {
- ip46_address_t src_address;
- ip46_address_t dst_address;
- union
- {
- struct
- {
- u16 src_port;
- u16 dst_port;
- };
- u32 l4_hdr;
- };
- };
- u8 as_u8[36];
-} crc32c_5tuple_key_t;
-
static const u8 l4_mask_bits[256] = {
[IP_PROTOCOL_ICMP] = 16, [IP_PROTOCOL_IGMP] = 8,
[IP_PROTOCOL_TCP] = 32, [IP_PROTOCOL_UDP] = 32,
@@ -40,39 +19,42 @@ static const u8 l4_mask_bits[256] = {
[IP_PROTOCOL_ICMP6] = 16,
};
-static_always_inline void
-compute_ip6_key (ip6_header_t *ip, crc32c_5tuple_key_t *k)
+static_always_inline u32
+compute_ip6_key (ip6_header_t *ip)
{
+ u32 hash = 0, l4hdr;
u8 pr;
-
- /* copy 32 bytes of ip6 src and dst addresses into hash_key_t */
- clib_memcpy_fast ((u8 *) k, (u8 *) ip + 8, sizeof (ip6_address_t) * 2);
+ /* dst + src ip as u64 */
+ hash = clib_crc32c_u64 (hash, *(u64u *) ((u8 *) ip + 8));
+ hash = clib_crc32c_u64 (hash, *(u64u *) ((u8 *) ip + 16));
+ hash = clib_crc32c_u64 (hash, *(u64u *) ((u8 *) ip + 24));
+ hash = clib_crc32c_u64 (hash, *(u64u *) ((u8 *) ip + 32));
pr = ip->protocol;
- /* write l4 header */
- k->l4_hdr = *(u32 *) ip6_next_header (ip) & pow2_mask (l4_mask_bits[pr]);
+ l4hdr = *(u32 *) ip6_next_header (ip) & pow2_mask (l4_mask_bits[pr]);
+ /* protocol + l4 hdr */
+ return clib_crc32c_u64 (hash, ((u64) pr << 32) | l4hdr);
}
-static_always_inline void
-compute_ip4_key (ip4_header_t *ip, crc32c_5tuple_key_t *k)
+static_always_inline u32
+compute_ip4_key (ip4_header_t *ip)
{
+ u32 hash = 0, l4hdr;
u8 pr;
- u64 *key = (u64 *) k;
- /* copy 8 bytes of ip src and dst addresses into hash_key_t */
- key[0] = 0;
- key[1] = 0;
- key[2] = 0;
- key[3] = *(u64 *) ((u8 *) ip + 12);
+ /* dst + src ip as u64 */
+ hash = clib_crc32c_u64 (0, *(u64 *) ((u8 *) ip + 12));
pr = ip->protocol;
- /* write l4 header */
- k->l4_hdr = *(u32 *) ip4_next_header (ip) & pow2_mask (l4_mask_bits[pr]);
+ l4hdr = *(u32 *) ip4_next_header (ip) & pow2_mask (l4_mask_bits[pr]);
+ /* protocol + l4 hdr */
+ return clib_crc32c_u64 (hash, ((u64) pr << 32) | l4hdr);
}
-static_always_inline void
-compute_ip_key (void *p, crc32c_5tuple_key_t *key)
+static_always_inline u32
+compute_ip_key (void *p)
{
if ((((u8 *) p)[0] & 0xf0) == 0x40)
- compute_ip4_key (p, key);
+ return compute_ip4_key (p);
else if ((((u8 *) p)[0] & 0xf0) == 0x60)
- compute_ip6_key (p, key);
+ return compute_ip6_key (p);
+ return 0;
}
void
@@ -82,22 +64,15 @@ vnet_crc32c_5tuple_ip_func (void **p, u32 *hash, u32 n_packets)
while (n_left_from >= 8)
{
- crc32c_5tuple_key_t key[4] = {};
-
clib_prefetch_load (p[4]);
clib_prefetch_load (p[5]);
clib_prefetch_load (p[6]);
clib_prefetch_load (p[7]);
- compute_ip_key (p[0], &key[0]);
- compute_ip_key (p[1], &key[1]);
- compute_ip_key (p[2], &key[2]);
- compute_ip_key (p[3], &key[3]);
-
- hash[0] = clib_crc32c (key[0].as_u8, sizeof (key[0]));
- hash[1] = clib_crc32c (key[1].as_u8, sizeof (key[1]));
- hash[2] = clib_crc32c (key[2].as_u8, sizeof (key[2]));
- hash[3] = clib_crc32c (key[3].as_u8, sizeof (key[3]));
+ hash[0] = compute_ip_key (p[0]);
+ hash[1] = compute_ip_key (p[1]);
+ hash[2] = compute_ip_key (p[2]);
+ hash[3] = compute_ip_key (p[3]);
hash += 4;
n_left_from -= 4;
@@ -106,11 +81,7 @@ vnet_crc32c_5tuple_ip_func (void **p, u32 *hash, u32 n_packets)
while (n_left_from > 0)
{
- crc32c_5tuple_key_t key = {};
-
- compute_ip_key (p[0], &key);
-
- hash[0] = clib_crc32c (key.as_u8, sizeof (key));
+ hash[0] = compute_ip_key (p[0]);
hash += 1;
n_left_from -= 1;
@@ -118,8 +89,8 @@ vnet_crc32c_5tuple_ip_func (void **p, u32 *hash, u32 n_packets)
}
}
-static_always_inline void
-compute_ethernet_key (void *p, crc32c_5tuple_key_t *key)
+static_always_inline u32
+compute_ethernet_key (void *p)
{
u16 ethertype = 0, l2hdr_sz = 0;
@@ -144,13 +115,14 @@ compute_ethernet_key (void *p, crc32c_5tuple_key_t *key)
if (ethertype == ETHERNET_TYPE_IP4)
{
ip4_header_t *ip4 = (ip4_header_t *) (p + l2hdr_sz);
- compute_ip4_key (ip4, key);
+ return compute_ip4_key (ip4);
}
else if (ethertype == ETHERNET_TYPE_IP6)
{
ip6_header_t *ip6 = (ip6_header_t *) (p + l2hdr_sz);
- compute_ip6_key (ip6, key);
+ return compute_ip6_key (ip6);
}
+ return 0;
}
void
@@ -160,22 +132,15 @@ vnet_crc32c_5tuple_ethernet_func (void **p, u32 *hash, u32 n_packets)
while (n_left_from >= 8)
{
- crc32c_5tuple_key_t key[4] = {};
-
clib_prefetch_load (p[4]);
clib_prefetch_load (p[5]);
clib_prefetch_load (p[6]);
clib_prefetch_load (p[7]);
- compute_ethernet_key (p[0], &key[0]);
- compute_ethernet_key (p[1], &key[1]);
- compute_ethernet_key (p[2], &key[2]);
- compute_ethernet_key (p[3], &key[3]);
-
- hash[0] = clib_crc32c (key[0].as_u8, sizeof (key[0]));
- hash[1] = clib_crc32c (key[1].as_u8, sizeof (key[1]));
- hash[2] = clib_crc32c (key[2].as_u8, sizeof (key[2]));
- hash[3] = clib_crc32c (key[3].as_u8, sizeof (key[3]));
+ hash[0] = compute_ethernet_key (p[0]);
+ hash[1] = compute_ethernet_key (p[1]);
+ hash[2] = compute_ethernet_key (p[2]);
+ hash[3] = compute_ethernet_key (p[3]);
hash += 4;
n_left_from -= 4;
@@ -184,11 +149,7 @@ vnet_crc32c_5tuple_ethernet_func (void **p, u32 *hash, u32 n_packets)
while (n_left_from > 0)
{
- crc32c_5tuple_key_t key = {};
-
- compute_ethernet_key (p[0], &key);
-
- hash[0] = clib_crc32c (key.as_u8, sizeof (key));
+ hash[0] = compute_ethernet_key (p[0]);
hash += 1;
n_left_from -= 1;