diff options
Diffstat (limited to 'src/vnet/hash/crc32_5tuple.c')
| -rw-r--r-- | src/vnet/hash/crc32_5tuple.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/vnet/hash/crc32_5tuple.c b/src/vnet/hash/crc32_5tuple.c new file mode 100644 index 00000000000..2cdb19440c6 --- /dev/null +++ b/src/vnet/hash/crc32_5tuple.c @@ -0,0 +1,168 @@ +/* + * SPDX-License-Identifier: Apache-2.0 + * Copyright(c) 2021 Cisco Systems, Inc. + */ + +#include <vnet/vnet.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/ip/ip4_packet.h> +#include <vnet/ip/ip6_packet.h> +#include <vnet/hash/hash.h> +#include <vppinfra/crc32.h> + +#ifdef clib_crc32c_uses_intrinsics + +static const u8 l4_mask_bits[256] = { + [IP_PROTOCOL_ICMP] = 16, [IP_PROTOCOL_IGMP] = 8, + [IP_PROTOCOL_TCP] = 32, [IP_PROTOCOL_UDP] = 32, + [IP_PROTOCOL_IPSEC_ESP] = 32, [IP_PROTOCOL_IPSEC_AH] = 32, + [IP_PROTOCOL_ICMP6] = 16, +}; + +static_always_inline u32 +compute_ip6_key (ip6_header_t *ip) +{ + u32 hash = 0, l4hdr; + u8 pr; + /* 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; + 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 u32 +compute_ip4_key (ip4_header_t *ip) +{ + u32 hash = 0, l4hdr; + u8 pr; + /* dst + src ip as u64 */ + hash = clib_crc32c_u64 (0, *(u64 *) ((u8 *) ip + 12)); + pr = ip->protocol; + 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 u32 +compute_ip_key (void *p) +{ + if ((((u8 *) p)[0] & 0xf0) == 0x40) + return compute_ip4_key (p); + else if ((((u8 *) p)[0] & 0xf0) == 0x60) + return compute_ip6_key (p); + return 0; +} + +void +vnet_crc32c_5tuple_ip_func (void **p, u32 *hash, u32 n_packets) +{ + u32 n_left_from = n_packets; + + while (n_left_from >= 8) + { + clib_prefetch_load (p[4]); + clib_prefetch_load (p[5]); + clib_prefetch_load (p[6]); + clib_prefetch_load (p[7]); + + 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; + p += 4; + } + + while (n_left_from > 0) + { + hash[0] = compute_ip_key (p[0]); + + hash += 1; + n_left_from -= 1; + p += 1; + } +} + +static_always_inline u32 +compute_ethernet_key (void *p) +{ + u16 ethertype = 0, l2hdr_sz = 0; + + ethernet_header_t *eh = (ethernet_header_t *) p; + ethertype = clib_net_to_host_u16 (eh->type); + l2hdr_sz = sizeof (ethernet_header_t); + + if (ethernet_frame_is_tagged (ethertype)) + { + ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1); + + ethertype = clib_net_to_host_u16 (vlan->type); + l2hdr_sz += sizeof (*vlan); + while (ethernet_frame_is_tagged (ethertype)) + { + vlan++; + ethertype = clib_net_to_host_u16 (vlan->type); + l2hdr_sz += sizeof (*vlan); + } + } + + if (ethertype == ETHERNET_TYPE_IP4) + { + ip4_header_t *ip4 = (ip4_header_t *) (p + l2hdr_sz); + return compute_ip4_key (ip4); + } + else if (ethertype == ETHERNET_TYPE_IP6) + { + ip6_header_t *ip6 = (ip6_header_t *) (p + l2hdr_sz); + return compute_ip6_key (ip6); + } + return 0; +} + +void +vnet_crc32c_5tuple_ethernet_func (void **p, u32 *hash, u32 n_packets) +{ + u32 n_left_from = n_packets; + + while (n_left_from >= 8) + { + clib_prefetch_load (p[4]); + clib_prefetch_load (p[5]); + clib_prefetch_load (p[6]); + clib_prefetch_load (p[7]); + + 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; + p += 4; + } + + while (n_left_from > 0) + { + hash[0] = compute_ethernet_key (p[0]); + + hash += 1; + n_left_from -= 1; + p += 1; + } +} + +VNET_REGISTER_HASH_FUNCTION (crc32c_5tuple, static) = { + .name = "crc32c-5tuple", + .description = "IPv4/IPv6 header and TCP/UDP ports", + .priority = 50, + .function[VNET_HASH_FN_TYPE_ETHERNET] = vnet_crc32c_5tuple_ethernet_func, + .function[VNET_HASH_FN_TYPE_IP] = vnet_crc32c_5tuple_ip_func, +}; + +#endif |