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/*
* Copyright (c) 2016 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.
*/
#ifndef included_vnet_handoff_h
#define included_vnet_handoff_h
#include <vlib/vlib.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/ip/ip6_packet.h>
#include <vnet/mpls-gre/packet.h>
typedef enum {
HANDOFF_DISPATCH_NEXT_IP4_INPUT,
HANDOFF_DISPATCH_NEXT_IP6_INPUT,
HANDOFF_DISPATCH_NEXT_MPLS_INPUT,
HANDOFF_DISPATCH_NEXT_ETHERNET_INPUT,
HANDOFF_DISPATCH_NEXT_DROP,
HANDOFF_DISPATCH_N_NEXT,
} handoff_dispatch_next_t;
static inline
void vlib_put_handoff_queue_elt (vlib_frame_queue_elt_t * hf)
{
CLIB_MEMORY_BARRIER();
hf->valid = 1;
}
static inline vlib_frame_queue_elt_t *
vlib_get_handoff_queue_elt (u32 vlib_worker_index)
{
vlib_frame_queue_t *fq;
vlib_frame_queue_elt_t *elt;
u64 new_tail;
fq = vlib_frame_queues[vlib_worker_index];
ASSERT (fq);
new_tail = __sync_add_and_fetch (&fq->tail, 1);
/* Wait until a ring slot is available */
while (new_tail >= fq->head_hint + fq->nelts)
vlib_worker_thread_barrier_check ();
elt = fq->elts + (new_tail & (fq->nelts-1));
/* this would be very bad... */
while (elt->valid)
;
elt->msg_type = VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME;
elt->last_n_vectors = elt->n_vectors = 0;
return elt;
}
static inline vlib_frame_queue_t *
is_vlib_handoff_queue_congested (
u32 vlib_worker_index,
u32 queue_hi_thresh,
vlib_frame_queue_t ** handoff_queue_by_worker_index)
{
vlib_frame_queue_t *fq;
fq = handoff_queue_by_worker_index [vlib_worker_index];
if (fq != (vlib_frame_queue_t *)(~0))
return fq;
fq = vlib_frame_queues[vlib_worker_index];
ASSERT (fq);
if (PREDICT_FALSE(fq->tail >= (fq->head_hint + queue_hi_thresh))) {
/* a valid entry in the array will indicate the queue has reached
* the specified threshold and is congested
*/
handoff_queue_by_worker_index [vlib_worker_index] = fq;
fq->enqueue_full_events++;
return fq;
}
return NULL;
}
static inline vlib_frame_queue_elt_t *
dpdk_get_handoff_queue_elt (u32 vlib_worker_index,
vlib_frame_queue_elt_t **
handoff_queue_elt_by_worker_index)
{
vlib_frame_queue_elt_t *elt;
if (handoff_queue_elt_by_worker_index [vlib_worker_index])
return handoff_queue_elt_by_worker_index [vlib_worker_index];
elt = vlib_get_handoff_queue_elt (vlib_worker_index);
handoff_queue_elt_by_worker_index [vlib_worker_index] = elt;
return elt;
}
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_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_UNICAST)) {
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_UNICAST)) {
hash_key = mpls_get_key((mpls_unicast_header_t *)(outer+1));
} else {
hash_key = outer->type;
}
} else {
hash_key = 0;
}
return hash_key;
}
#endif /* included_vnet_handoff_h */
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