diff options
Diffstat (limited to 'src/vnet/hash/crc32_5tuple.c')
| -rw-r--r-- | src/vnet/hash/crc32_5tuple.c | 203 |
1 files changed, 203 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..69ee63a59df --- /dev/null +++ b/src/vnet/hash/crc32_5tuple.c @@ -0,0 +1,203 @@ +/* + * 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/ip/ip46_address.h> +#include <vnet/udp/udp_packet.h> +#include <vnet/hash/hash.h> +#include <vppinfra/crc32.h> + +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, + [IP_PROTOCOL_IPSEC_ESP] = 32, [IP_PROTOCOL_IPSEC_AH] = 32, + [IP_PROTOCOL_ICMP6] = 16, +}; + +static_always_inline void +compute_ip6_key (ip6_header_t *ip, crc32c_5tuple_key_t *k) +{ + 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); + pr = ip->protocol; + /* write l4 header */ + k->l4_hdr = *(u32 *) ip6_next_header (ip) & pow2_mask (l4_mask_bits[pr]); +} + +static_always_inline void +compute_ip4_key (ip4_header_t *ip, crc32c_5tuple_key_t *k) +{ + 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); + pr = ip->protocol; + /* write l4 header */ + k->l4_hdr = *(u32 *) ip4_next_header (ip) & pow2_mask (l4_mask_bits[pr]); +} +static_always_inline void +compute_ip_key (void *p, crc32c_5tuple_key_t *key) +{ + if ((((u8 *) p)[0] & 0xf0) == 0x40) + compute_ip4_key (p, key); + else if ((((u8 *) p)[0] & 0xf0) == 0x60) + compute_ip6_key (p, key); +} + +void +vnet_crc32c_5tuple_ip_func (void **p, u32 *hash, u32 n_packets) +{ + u32 n_left_from = 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 += 4; + n_left_from -= 4; + p += 4; + } + + 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 += 1; + n_left_from -= 1; + p += 1; + } +} + +static_always_inline void +compute_ethernet_key (void *p, crc32c_5tuple_key_t *key) +{ + 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); + compute_ip4_key (ip4, key); + } + else if (ethertype == ETHERNET_TYPE_IP6) + { + ip6_header_t *ip6 = (ip6_header_t *) (p + l2hdr_sz); + compute_ip6_key (ip6, key); + } +} + +void +vnet_crc32c_5tuple_ethernet_func (void **p, u32 *hash, u32 n_packets) +{ + u32 n_left_from = 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 += 4; + n_left_from -= 4; + p += 4; + } + + 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 += 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, +}; |