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Diffstat (limited to 'examples/tep_termination/vxlan.c')
| -rw-r--r-- | examples/tep_termination/vxlan.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/examples/tep_termination/vxlan.c b/examples/tep_termination/vxlan.c new file mode 100644 index 00000000..5ee1f956 --- /dev/null +++ b/examples/tep_termination/vxlan.c @@ -0,0 +1,259 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2015 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#include <stdint.h> +#include <rte_mbuf.h> +#include <rte_hash_crc.h> +#include <rte_byteorder.h> +#include <rte_udp.h> +#include <rte_tcp.h> +#include <rte_sctp.h> + +#include "main.h" +#include "vxlan.h" + +static uint16_t +get_psd_sum(void *l3_hdr, uint16_t ethertype, uint64_t ol_flags) +{ + if (ethertype == ETHER_TYPE_IPv4) + return rte_ipv4_phdr_cksum(l3_hdr, ol_flags); + else /* assume ethertype == ETHER_TYPE_IPv6 */ + return rte_ipv6_phdr_cksum(l3_hdr, ol_flags); +} + +/** + * Parse an ethernet header to fill the ethertype, outer_l2_len, outer_l3_len and + * ipproto. This function is able to recognize IPv4/IPv6 with one optional vlan + * header. + */ +static void +parse_ethernet(struct ether_hdr *eth_hdr, union tunnel_offload_info *info, + uint8_t *l4_proto) +{ + struct ipv4_hdr *ipv4_hdr; + struct ipv6_hdr *ipv6_hdr; + uint16_t ethertype; + + info->outer_l2_len = sizeof(struct ether_hdr); + ethertype = rte_be_to_cpu_16(eth_hdr->ether_type); + + if (ethertype == ETHER_TYPE_VLAN) { + struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1); + info->outer_l2_len += sizeof(struct vlan_hdr); + ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto); + } + + switch (ethertype) { + case ETHER_TYPE_IPv4: + ipv4_hdr = (struct ipv4_hdr *) + ((char *)eth_hdr + info->outer_l2_len); + info->outer_l3_len = sizeof(struct ipv4_hdr); + *l4_proto = ipv4_hdr->next_proto_id; + break; + case ETHER_TYPE_IPv6: + ipv6_hdr = (struct ipv6_hdr *) + ((char *)eth_hdr + info->outer_l2_len); + info->outer_l3_len = sizeof(struct ipv6_hdr); + *l4_proto = ipv6_hdr->proto; + break; + default: + info->outer_l3_len = 0; + *l4_proto = 0; + break; + } +} + +/** + * Calculate the checksum of a packet in hardware + */ +static uint64_t +process_inner_cksums(struct ether_hdr *eth_hdr, union tunnel_offload_info *info) +{ + void *l3_hdr = NULL; + uint8_t l4_proto; + uint16_t ethertype; + struct ipv4_hdr *ipv4_hdr; + struct ipv6_hdr *ipv6_hdr; + struct udp_hdr *udp_hdr; + struct tcp_hdr *tcp_hdr; + struct sctp_hdr *sctp_hdr; + uint64_t ol_flags = 0; + + info->l2_len = sizeof(struct ether_hdr); + ethertype = rte_be_to_cpu_16(eth_hdr->ether_type); + + if (ethertype == ETHER_TYPE_VLAN) { + struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1); + info->l2_len += sizeof(struct vlan_hdr); + ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto); + } + + l3_hdr = (char *)eth_hdr + info->l2_len; + + if (ethertype == ETHER_TYPE_IPv4) { + ipv4_hdr = (struct ipv4_hdr *)l3_hdr; + ipv4_hdr->hdr_checksum = 0; + ol_flags |= PKT_TX_IPV4; + ol_flags |= PKT_TX_IP_CKSUM; + info->l3_len = sizeof(struct ipv4_hdr); + l4_proto = ipv4_hdr->next_proto_id; + } else if (ethertype == ETHER_TYPE_IPv6) { + ipv6_hdr = (struct ipv6_hdr *)l3_hdr; + info->l3_len = sizeof(struct ipv6_hdr); + l4_proto = ipv6_hdr->proto; + ol_flags |= PKT_TX_IPV6; + } else + return 0; /* packet type not supported, nothing to do */ + + if (l4_proto == IPPROTO_UDP) { + udp_hdr = (struct udp_hdr *)((char *)l3_hdr + info->l3_len); + ol_flags |= PKT_TX_UDP_CKSUM; + udp_hdr->dgram_cksum = get_psd_sum(l3_hdr, + ethertype, ol_flags); + } else if (l4_proto == IPPROTO_TCP) { + tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + info->l3_len); + ol_flags |= PKT_TX_TCP_CKSUM; + tcp_hdr->cksum = get_psd_sum(l3_hdr, ethertype, + ol_flags); + if (tso_segsz != 0) { + ol_flags |= PKT_TX_TCP_SEG; + info->tso_segsz = tso_segsz; + info->l4_len = sizeof(struct tcp_hdr); + } + + } else if (l4_proto == IPPROTO_SCTP) { + sctp_hdr = (struct sctp_hdr *)((char *)l3_hdr + info->l3_len); + sctp_hdr->cksum = 0; + ol_flags |= PKT_TX_SCTP_CKSUM; + } + + return ol_flags; +} + +int +decapsulation(struct rte_mbuf *pkt) +{ + uint8_t l4_proto = 0; + uint16_t outer_header_len; + struct udp_hdr *udp_hdr; + union tunnel_offload_info info = { .data = 0 }; + struct ether_hdr *phdr = rte_pktmbuf_mtod(pkt, struct ether_hdr *); + + parse_ethernet(phdr, &info, &l4_proto); + + if (l4_proto != IPPROTO_UDP) + return -1; + + udp_hdr = (struct udp_hdr *)((char *)phdr + + info.outer_l2_len + info.outer_l3_len); + + /** check udp destination port, 4789 is the default vxlan port + * (rfc7348) or that the rx offload flag is set (i40e only + * currently)*/ + if (udp_hdr->dst_port != rte_cpu_to_be_16(DEFAULT_VXLAN_PORT) && + (pkt->packet_type & RTE_PTYPE_TUNNEL_MASK) == 0) + return -1; + outer_header_len = info.outer_l2_len + info.outer_l3_len + + sizeof(struct udp_hdr) + sizeof(struct vxlan_hdr); + + rte_pktmbuf_adj(pkt, outer_header_len); + + return 0; +} + +void +encapsulation(struct rte_mbuf *m, uint8_t queue_id) +{ + uint vport_id; + uint64_t ol_flags = 0; + uint32_t old_len = m->pkt_len, hash; + union tunnel_offload_info tx_offload = { .data = 0 }; + struct ether_hdr *phdr = rte_pktmbuf_mtod(m, struct ether_hdr *); + + /*Allocate space for new ethernet, IPv4, UDP and VXLAN headers*/ + struct ether_hdr *pneth = (struct ether_hdr *) rte_pktmbuf_prepend(m, + sizeof(struct ether_hdr) + sizeof(struct ipv4_hdr) + + sizeof(struct udp_hdr) + sizeof(struct vxlan_hdr)); + + struct ipv4_hdr *ip = (struct ipv4_hdr *) &pneth[1]; + struct udp_hdr *udp = (struct udp_hdr *) &ip[1]; + struct vxlan_hdr *vxlan = (struct vxlan_hdr *) &udp[1]; + + /* convert TX queue ID to vport ID */ + vport_id = queue_id - 1; + + /* replace original Ethernet header with ours */ + pneth = rte_memcpy(pneth, &app_l2_hdr[vport_id], + sizeof(struct ether_hdr)); + + /* copy in IP header */ + ip = rte_memcpy(ip, &app_ip_hdr[vport_id], + sizeof(struct ipv4_hdr)); + ip->total_length = rte_cpu_to_be_16(m->data_len + - sizeof(struct ether_hdr)); + + /* outer IP checksum */ + ol_flags |= PKT_TX_OUTER_IP_CKSUM; + ip->hdr_checksum = 0; + + /* inner IP checksum offload */ + if (tx_checksum) { + ol_flags |= process_inner_cksums(phdr, &tx_offload); + m->l2_len = tx_offload.l2_len; + m->l3_len = tx_offload.l3_len; + m->l4_len = tx_offload.l4_len; + m->l2_len += ETHER_VXLAN_HLEN; + } + + m->outer_l2_len = sizeof(struct ether_hdr); + m->outer_l3_len = sizeof(struct ipv4_hdr); + + m->ol_flags |= ol_flags; + m->tso_segsz = tx_offload.tso_segsz; + + /*VXLAN HEADER*/ + vxlan->vx_flags = rte_cpu_to_be_32(VXLAN_HF_VNI); + vxlan->vx_vni = rte_cpu_to_be_32(vxdev.out_key << 8); + + /*UDP HEADER*/ + udp->dgram_cksum = 0; + udp->dgram_len = rte_cpu_to_be_16(old_len + + sizeof(struct udp_hdr) + + sizeof(struct vxlan_hdr)); + + udp->dst_port = rte_cpu_to_be_16(vxdev.dst_port); + hash = rte_hash_crc(phdr, 2 * ETHER_ADDR_LEN, phdr->ether_type); + udp->src_port = rte_cpu_to_be_16((((uint64_t) hash * PORT_RANGE) >> 32) + + PORT_MIN); + + return; +} |