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/*
// Copyright (c) 2010-2017 Intel Corporation
//
// 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 <rte_ethdev.h>
#include <rte_ether.h>
#include <rte_ip.h>
#include <rte_udp.h>
#include "vxlangpe_nsh.h"
#include "task_base.h"
#include "tx_pkt.h"
#include "task_init.h"
#include "thread_generic.h"
#include "prefetch.h"
#include "log.h"
#define VXLAN_GPE_HDR_SZ sizeof(struct ether_hdr) + sizeof(struct ipv4_hdr) + sizeof(struct udp_hdr) + sizeof(struct vxlan_gpe_hdr) + sizeof(struct nsh_hdr)
#define ETHER_NSH_TYPE 0x4F89 /* 0x894F in little endian */
#define VXLAN_GPE_NSH_TYPE 0xB612 /* 4790 in little endian */
#define VXLAN_GPE_NP 0x4
uint16_t decap_nsh_packets(struct rte_mbuf **mbufs, uint16_t n_pkts);
uint16_t encap_nsh_packets(struct rte_mbuf **mbufs, uint16_t n_pkts);
struct task_decap_nsh {
struct task_base base;
};
struct task_encap_nsh {
struct task_base base;
};
static void init_task_decap_nsh(__attribute__((unused)) struct task_base *tbase,
__attribute__((unused)) struct task_args *targ)
{
return;
}
static inline uint8_t handle_decap_nsh(__attribute__((unused)) struct task_decap_nsh *task, struct rte_mbuf *mbuf)
{
struct ether_hdr *eth_hdr = NULL;
struct udp_hdr *udp_hdr = NULL;
struct vxlan_gpe_hdr *vxlan_gpe_hdr = NULL;
uint16_t hdr_len;
eth_hdr = rte_pktmbuf_mtod(mbuf, struct ether_hdr *);
if (eth_hdr->ether_type == ETHER_NSH_TYPE) {
/* "decapsulate" Ethernet + NSH header by moving packet pointer */
hdr_len = sizeof(struct ether_hdr) + sizeof(struct nsh_hdr);
mbuf->data_len = (uint16_t)(mbuf->data_len - hdr_len);
mbuf->data_off += hdr_len;
mbuf->pkt_len = (uint32_t)(mbuf->pkt_len - hdr_len);
/* save length of header in reserved 16bits of rte_mbuf */
mbuf->udata64 = hdr_len;
}
else {
if (mbuf->data_len < VXLAN_GPE_HDR_SZ) {
mbuf->udata64 = 0;
return 0;
}
/* check the UDP destination port */
udp_hdr = (struct udp_hdr *)(((unsigned char *)eth_hdr) + sizeof(struct ether_hdr) + sizeof(struct ipv4_hdr));
if (udp_hdr->dst_port != VXLAN_GPE_NSH_TYPE) {
mbuf->udata64 = 0;
return 0;
}
/* check the Next Protocol field in VxLAN-GPE header */
vxlan_gpe_hdr = (struct vxlan_gpe_hdr *)(((unsigned char *)eth_hdr) + sizeof(struct ether_hdr) + sizeof(struct ipv4_hdr) + sizeof(struct udp_hdr));
if (vxlan_gpe_hdr->next_proto != VXLAN_GPE_NP) {
mbuf->udata64 = 0;
return 0;
}
/* "decapsulate" VxLAN-GPE + NSH header by moving packet pointer */
hdr_len = VXLAN_GPE_HDR_SZ;
mbuf->data_len = (uint16_t)(mbuf->data_len - hdr_len);
mbuf->data_off += hdr_len;
mbuf->pkt_len = (uint32_t)(mbuf->pkt_len - hdr_len);
/* save length of header in reserved 16bits of rte_mbuf */
mbuf->udata64 = hdr_len;
}
return 0;
}
static int handle_decap_nsh_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
{
struct task_decap_nsh *task = (struct task_decap_nsh *)tbase;
uint8_t out[MAX_PKT_BURST];
uint16_t j;
prefetch_first(mbufs, n_pkts);
for (j = 0; j + PREFETCH_OFFSET < n_pkts; ++j) {
#ifdef PROX_PREFETCH_OFFSET
PREFETCH0(mbufs[j + PREFETCH_OFFSET]);
PREFETCH0(rte_pktmbuf_mtod(mbufs[j + PREFETCH_OFFSET - 1], void *));
#endif
out[j] = handle_decap_nsh(task, mbufs[j]);
}
#ifdef PROX_PREFETCH_OFFSET
PREFETCH0(rte_pktmbuf_mtod(mbufs[n_pkts - 1], void *));
for (; j < n_pkts; ++j) {
out[j] = handle_decap_nsh(task, mbufs[j]);
}
#endif
return task->base.tx_pkt(&task->base, mbufs, n_pkts, out);
}
static void init_task_encap_nsh(__attribute__((unused)) struct task_base *tbase,
__attribute__((unused)) struct task_args *targ)
{
return;
}
static inline uint8_t handle_encap_nsh(__attribute__((unused)) struct task_encap_nsh *task, struct rte_mbuf *mbuf)
{
struct ether_hdr *eth_hdr = NULL;
struct nsh_hdr *nsh_hdr = NULL;
struct udp_hdr *udp_hdr = NULL;
struct vxlan_gpe_hdr *vxlan_gpe_hdr = NULL;
uint16_t hdr_len;
if (mbuf == NULL)
return 0;
if (mbuf->udata64 == 0)
return 0;
/* use header length saved in reserved 16bits of rte_mbuf to
"encapsulate" transport + NSH header by moving packet pointer */
mbuf->data_len = (uint16_t)(mbuf->data_len + mbuf->udata64);
mbuf->data_off -= mbuf->udata64;
mbuf->pkt_len = (uint32_t)(mbuf->pkt_len + mbuf->udata64);
eth_hdr = rte_pktmbuf_mtod(mbuf, struct ether_hdr *);
if (eth_hdr->ether_type == ETHER_NSH_TYPE) {
nsh_hdr = (struct nsh_hdr *) (((unsigned char *)eth_hdr) + sizeof(struct ether_hdr));
/* decrement Service Index in NSH header */
if (nsh_hdr->sf_index > 0)
nsh_hdr->sf_index -= 1;
}
else {
/* "encapsulate" VxLAN-GPE + NSH header by moving packet pointer */
if (mbuf->data_len < VXLAN_GPE_HDR_SZ)
return 0;
/* check the UDP destination port */
udp_hdr = (struct udp_hdr *)(((unsigned char *)eth_hdr) + sizeof(struct ether_hdr) + sizeof(struct ipv4_hdr));
if (udp_hdr->dst_port != VXLAN_GPE_NSH_TYPE)
return 0;
/* check the Next Protocol field in VxLAN-GPE header */
vxlan_gpe_hdr = (struct vxlan_gpe_hdr *)(((unsigned char *)eth_hdr) + sizeof(struct ether_hdr) + sizeof(struct ipv4_hdr) + sizeof(struct udp_hdr));
if (vxlan_gpe_hdr->next_proto != VXLAN_GPE_NP)
return 0;
/* decrement Service Index in NSH header */
nsh_hdr = (struct nsh_hdr *)(((unsigned char *)vxlan_gpe_hdr) + sizeof(struct vxlan_gpe_hdr));
if (nsh_hdr->sf_index > 0)
nsh_hdr->sf_index -= 1;
}
return 0;
}
static int handle_encap_nsh_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
{
struct task_encap_nsh *task = (struct task_encap_nsh *)tbase;
uint8_t out[MAX_PKT_BURST];
uint16_t j;
prefetch_first(mbufs, n_pkts);
for (j = 0; j + PREFETCH_OFFSET < n_pkts; ++j) {
#ifdef PROX_PREFETCH_OFFSET
PREFETCH0(mbufs[j + PREFETCH_OFFSET]);
PREFETCH0(rte_pktmbuf_mtod(mbufs[j + PREFETCH_OFFSET - 1], void *));
#endif
out[j] = handle_encap_nsh(task, mbufs[j]);
}
#ifdef PROX_PREFETCH_OFFSET
PREFETCH0(rte_pktmbuf_mtod(mbufs[n_pkts - 1], void *));
for (; j < n_pkts; ++j) {
out[j] = handle_encap_nsh(task, mbufs[j]);
}
#endif
return task->base.tx_pkt(&task->base, mbufs, n_pkts, out);
}
static struct task_init task_init_decap_nsh = {
.mode_str = "decapnsh",
.init = init_task_decap_nsh,
.handle = handle_decap_nsh_bulk,
.thread_x = thread_generic,
.size = sizeof(struct task_decap_nsh)
};
static struct task_init task_init_encap_nsh = {
.mode_str = "encapnsh",
.init = init_task_encap_nsh,
.handle = handle_encap_nsh_bulk,
.size = sizeof(struct task_encap_nsh)
};
__attribute__((constructor)) static void reg_task_nshtag(void)
{
reg_task(&task_init_decap_nsh);
reg_task(&task_init_encap_nsh);
}
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