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/*
* Ouroboros - Copyright (C) 2016 - 2018
*
* Protocol Control Information of Data Transfer AE
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#include <ouroboros/errno.h>
#include "dt_pci.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#define DEFAULT_TTL 60
struct {
uint8_t addr_size;
uint8_t fd_size;
bool has_ttl;
size_t head_size;
/* offsets */
size_t qc_o;
size_t ttl_o;
size_t fd_o;
} dt_pci_info;
int dt_pci_init(uint8_t addr_size,
uint8_t fd_size,
bool has_ttl)
{
dt_pci_info.addr_size = addr_size;
dt_pci_info.fd_size = fd_size;
dt_pci_info.has_ttl = has_ttl;
dt_pci_info.qc_o = dt_pci_info.addr_size;
dt_pci_info.ttl_o = dt_pci_info.qc_o + QOS_LEN;
if (dt_pci_info.has_ttl)
dt_pci_info.fd_o = dt_pci_info.ttl_o + TTL_LEN;
else
dt_pci_info.fd_o = dt_pci_info.ttl_o;
dt_pci_info.head_size = dt_pci_info.fd_o + dt_pci_info.fd_size;
return 0;
}
void dt_pci_fini(void) {
return;
}
int dt_pci_ser(struct shm_du_buff * sdb,
struct dt_pci * dt_pci)
{
uint8_t * head;
uint8_t ttl = DEFAULT_TTL;
assert(sdb);
assert(dt_pci);
head = shm_du_buff_head_alloc(sdb, dt_pci_info.head_size);
if (head == NULL)
return -EPERM;
/* FIXME: Add check and operations for Big Endian machines */
memcpy(head, &dt_pci->dst_addr, dt_pci_info.addr_size);
memcpy(head + dt_pci_info.qc_o, &dt_pci->qc, QOS_LEN);
if (dt_pci_info.has_ttl)
memcpy(head + dt_pci_info.ttl_o, &ttl, TTL_LEN);
memcpy(head + dt_pci_info.fd_o, &dt_pci->fd, dt_pci_info.fd_size);
return 0;
}
void dt_pci_des(struct shm_du_buff * sdb,
struct dt_pci * dt_pci)
{
uint8_t * head;
assert(sdb);
assert(dt_pci);
head = shm_du_buff_head(sdb);
/* FIXME: Add check and operations for Big Endian machines */
memcpy(&dt_pci->dst_addr, head, dt_pci_info.addr_size);
memcpy(&dt_pci->qc, head + dt_pci_info.qc_o, QOS_LEN);
if (dt_pci_info.has_ttl) {
--*(head + dt_pci_info.ttl_o); /* decrease TTL */
memcpy(&dt_pci->ttl, head + dt_pci_info.ttl_o, TTL_LEN);
} else {
dt_pci->ttl = 1;
}
memcpy(&dt_pci->fd, head + dt_pci_info.fd_o, dt_pci_info.fd_size);
}
void dt_pci_shrink(struct shm_du_buff * sdb)
{
assert(sdb);
shm_du_buff_head_release(sdb, dt_pci_info.head_size);
}
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