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-rw-r--r--src/vnet/hash/crc32_handoff_eth.c341
1 files changed, 341 insertions, 0 deletions
diff --git a/src/vnet/hash/crc32_handoff_eth.c b/src/vnet/hash/crc32_handoff_eth.c
new file mode 100644
index 00000000000..13fc12ce6ea
--- /dev/null
+++ b/src/vnet/hash/crc32_handoff_eth.c
@@ -0,0 +1,341 @@
+/*
+ * Copyright (c) 2021 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/hash/hash.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/mpls/packet.h>
+#include <vppinfra/crc32.h>
+
+static inline u64
+ipv4_get_key (ip4_header_t * ip)
+{
+ u64 hash_key;
+
+ hash_key = *((u64 *) (&ip->address_pair)) ^ ip->protocol;
+
+ return hash_key;
+}
+
+static inline u64
+ipv6_get_key (ip6_header_t * ip)
+{
+ u64 hash_key;
+
+ hash_key = ip->src_address.as_u64[0] ^
+ rotate_left (ip->src_address.as_u64[1], 13) ^
+ rotate_left (ip->dst_address.as_u64[0], 26) ^
+ rotate_left (ip->dst_address.as_u64[1], 39) ^ ip->protocol;
+
+ return hash_key;
+}
+
+#define MPLS_BOTTOM_OF_STACK_BIT_MASK 0x00000100U
+#define MPLS_LABEL_MASK 0xFFFFF000U
+
+static inline u64
+mpls_get_key (mpls_unicast_header_t * m)
+{
+ u64 hash_key;
+ u8 ip_ver;
+
+
+ /* find the bottom of the MPLS label stack. */
+ if (PREDICT_TRUE (m->label_exp_s_ttl &
+ clib_net_to_host_u32 (MPLS_BOTTOM_OF_STACK_BIT_MASK)))
+ {
+ goto bottom_lbl_found;
+ }
+ m++;
+
+ if (PREDICT_TRUE (m->label_exp_s_ttl &
+ clib_net_to_host_u32 (MPLS_BOTTOM_OF_STACK_BIT_MASK)))
+ {
+ goto bottom_lbl_found;
+ }
+ m++;
+
+ if (m->label_exp_s_ttl &
+ clib_net_to_host_u32 (MPLS_BOTTOM_OF_STACK_BIT_MASK))
+ {
+ goto bottom_lbl_found;
+ }
+ m++;
+
+ if (m->label_exp_s_ttl &
+ clib_net_to_host_u32 (MPLS_BOTTOM_OF_STACK_BIT_MASK))
+ {
+ goto bottom_lbl_found;
+ }
+ m++;
+
+ if (m->label_exp_s_ttl &
+ clib_net_to_host_u32 (MPLS_BOTTOM_OF_STACK_BIT_MASK))
+ {
+ goto bottom_lbl_found;
+ }
+
+ /* the bottom label was not found - use the last label */
+ hash_key = m->label_exp_s_ttl & clib_net_to_host_u32 (MPLS_LABEL_MASK);
+
+ return hash_key;
+
+bottom_lbl_found:
+ m++;
+ ip_ver = (*((u8 *) m) >> 4);
+
+ /* find out if it is IPV4 or IPV6 header */
+ if (PREDICT_TRUE (ip_ver == 4))
+ {
+ hash_key = ipv4_get_key ((ip4_header_t *) m);
+ }
+ else if (PREDICT_TRUE (ip_ver == 6))
+ {
+ hash_key = ipv6_get_key ((ip6_header_t *) m);
+ }
+ else
+ {
+ /* use the bottom label */
+ hash_key =
+ (m - 1)->label_exp_s_ttl & clib_net_to_host_u32 (MPLS_LABEL_MASK);
+ }
+
+ return hash_key;
+
+}
+
+static inline u64
+eth_get_sym_key (ethernet_header_t * h0)
+{
+ u64 hash_key;
+
+ if (PREDICT_TRUE (h0->type) == clib_host_to_net_u16 (ETHERNET_TYPE_IP4))
+ {
+ ip4_header_t *ip = (ip4_header_t *) (h0 + 1);
+ hash_key =
+ (u64) (ip->src_address.as_u32 ^
+ ip->dst_address.as_u32 ^ ip->protocol);
+ }
+ else if (h0->type == clib_host_to_net_u16 (ETHERNET_TYPE_IP6))
+ {
+ ip6_header_t *ip = (ip6_header_t *) (h0 + 1);
+ hash_key = (u64) (ip->src_address.as_u64[0] ^
+ ip->src_address.as_u64[1] ^
+ ip->dst_address.as_u64[0] ^
+ ip->dst_address.as_u64[1] ^ ip->protocol);
+ }
+ else if (h0->type == clib_host_to_net_u16 (ETHERNET_TYPE_MPLS))
+ {
+ hash_key = mpls_get_key ((mpls_unicast_header_t *) (h0 + 1));
+ }
+ else
+ if (PREDICT_FALSE
+ ((h0->type == clib_host_to_net_u16 (ETHERNET_TYPE_VLAN))
+ || (h0->type == clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD))))
+ {
+ ethernet_vlan_header_t *outer = (ethernet_vlan_header_t *) (h0 + 1);
+
+ outer = (outer->type == clib_host_to_net_u16 (ETHERNET_TYPE_VLAN)) ?
+ outer + 1 : outer;
+ if (PREDICT_TRUE (outer->type) ==
+ clib_host_to_net_u16 (ETHERNET_TYPE_IP4))
+ {
+ ip4_header_t *ip = (ip4_header_t *) (outer + 1);
+ hash_key =
+ (u64) (ip->src_address.as_u32 ^
+ ip->dst_address.as_u32 ^ ip->protocol);
+ }
+ else if (outer->type == clib_host_to_net_u16 (ETHERNET_TYPE_IP6))
+ {
+ ip6_header_t *ip = (ip6_header_t *) (outer + 1);
+ hash_key =
+ (u64) (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1] ^
+ ip->dst_address.as_u64[0] ^
+ ip->dst_address.as_u64[1] ^ ip->protocol);
+ }
+ else if (outer->type == clib_host_to_net_u16 (ETHERNET_TYPE_MPLS))
+ {
+ hash_key = mpls_get_key ((mpls_unicast_header_t *) (outer + 1));
+ }
+ else
+ {
+ hash_key = outer->type;
+ }
+ }
+ else
+ {
+ hash_key = 0;
+ }
+
+ return hash_key;
+}
+
+static inline u64
+eth_get_key (ethernet_header_t * h0)
+{
+ u64 hash_key;
+
+ if (PREDICT_TRUE (h0->type) == clib_host_to_net_u16 (ETHERNET_TYPE_IP4))
+ {
+ hash_key = ipv4_get_key ((ip4_header_t *) (h0 + 1));
+ }
+ else if (h0->type == clib_host_to_net_u16 (ETHERNET_TYPE_IP6))
+ {
+ hash_key = ipv6_get_key ((ip6_header_t *) (h0 + 1));
+ }
+ else if (h0->type == clib_host_to_net_u16 (ETHERNET_TYPE_MPLS))
+ {
+ hash_key = mpls_get_key ((mpls_unicast_header_t *) (h0 + 1));
+ }
+ else if ((h0->type == clib_host_to_net_u16 (ETHERNET_TYPE_VLAN)) ||
+ (h0->type == clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD)))
+ {
+ ethernet_vlan_header_t *outer = (ethernet_vlan_header_t *) (h0 + 1);
+
+ outer = (outer->type == clib_host_to_net_u16 (ETHERNET_TYPE_VLAN)) ?
+ outer + 1 : outer;
+ if (PREDICT_TRUE (outer->type) ==
+ clib_host_to_net_u16 (ETHERNET_TYPE_IP4))
+ {
+ hash_key = ipv4_get_key ((ip4_header_t *) (outer + 1));
+ }
+ else if (outer->type == clib_host_to_net_u16 (ETHERNET_TYPE_IP6))
+ {
+ hash_key = ipv6_get_key ((ip6_header_t *) (outer + 1));
+ }
+ else if (outer->type == clib_host_to_net_u16 (ETHERNET_TYPE_MPLS))
+ {
+ hash_key = mpls_get_key ((mpls_unicast_header_t *) (outer + 1));
+ }
+ else
+ {
+ hash_key = outer->type;
+ }
+ }
+ else
+ {
+ hash_key = 0;
+ }
+
+ return hash_key;
+}
+
+void
+handoff_eth_crc32c_func (void **p, u32 *hash, u32 n_packets)
+{
+ u32 n_left_from = n_packets;
+
+ while (n_left_from >= 8)
+ {
+ u64 key[4] = {};
+
+ clib_prefetch_load (p[4]);
+ clib_prefetch_load (p[5]);
+ clib_prefetch_load (p[6]);
+ clib_prefetch_load (p[7]);
+
+ key[0] = eth_get_key ((ethernet_header_t *) p[0]);
+ key[1] = eth_get_key ((ethernet_header_t *) p[1]);
+ key[2] = eth_get_key ((ethernet_header_t *) p[2]);
+ key[3] = eth_get_key ((ethernet_header_t *) p[3]);
+
+ hash[0] = clib_crc32c ((u8 *) &key[0], sizeof (key[0]));
+ hash[1] = clib_crc32c ((u8 *) &key[1], sizeof (key[1]));
+ hash[2] = clib_crc32c ((u8 *) &key[2], sizeof (key[2]));
+ hash[3] = clib_crc32c ((u8 *) &key[3], sizeof (key[3]));
+
+ hash += 4;
+ n_left_from -= 4;
+ p += 4;
+ }
+
+ while (n_left_from > 0)
+ {
+ u64 key;
+
+ key = eth_get_key ((ethernet_header_t *) p[0]);
+ hash[0] = clib_crc32c ((u8 *) &key, sizeof (key));
+
+ hash += 1;
+ n_left_from -= 1;
+ p += 1;
+ }
+}
+
+VNET_REGISTER_HASH_FUNCTION (handoff_eth_crc32c, static) = {
+ .name = "handoff-eth-crc32c",
+ .description = "Ethernet/IPv4/IPv6/MPLS headers",
+ .priority = 2,
+ .function[VNET_HASH_FN_TYPE_ETHERNET] = handoff_eth_crc32c_func,
+};
+
+void
+handoff_eth_sym_crc32c_func (void **p, u32 *hash, u32 n_packets)
+{
+ u32 n_left_from = n_packets;
+
+ while (n_left_from >= 8)
+ {
+ u64 key[4] = {};
+
+ clib_prefetch_load (p[4]);
+ clib_prefetch_load (p[5]);
+ clib_prefetch_load (p[6]);
+ clib_prefetch_load (p[7]);
+
+ key[0] = eth_get_sym_key ((ethernet_header_t *) p[0]);
+ key[1] = eth_get_sym_key ((ethernet_header_t *) p[1]);
+ key[2] = eth_get_sym_key ((ethernet_header_t *) p[2]);
+ key[3] = eth_get_sym_key ((ethernet_header_t *) p[3]);
+
+ hash[0] = clib_crc32c ((u8 *) &key[0], sizeof (key[0]));
+ hash[1] = clib_crc32c ((u8 *) &key[1], sizeof (key[1]));
+ hash[2] = clib_crc32c ((u8 *) &key[2], sizeof (key[2]));
+ hash[3] = clib_crc32c ((u8 *) &key[3], sizeof (key[3]));
+
+ hash += 4;
+ n_left_from -= 4;
+ p += 4;
+ }
+
+ while (n_left_from > 0)
+ {
+ u64 key;
+
+ key = eth_get_sym_key ((ethernet_header_t *) p[0]);
+ hash[0] = clib_crc32c ((u8 *) &key, sizeof (key));
+
+ hash += 1;
+ n_left_from -= 1;
+ p += 1;
+ }
+}
+
+VNET_REGISTER_HASH_FUNCTION (handoff_eth_sym_crc32c, static) = {
+ .name = "handoff-eth-sym-crc32c",
+ .description = "Ethernet/IPv4/IPv6/MPLS headers Symmetric",
+ .priority = 1,
+ .function[VNET_HASH_FN_TYPE_ETHERNET] = handoff_eth_sym_crc32c_func,
+};
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */