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VILLASnode/lib/kernel/if.c

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/** Interface related functions.
*
* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
*
* VILLASnode
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
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* 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.
*
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* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
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#include <linux/if_packet.h>
#include <netlink/route/link.h>
#include <villas/config.h>
#include <villas/utils.h>
#include <villas/kernel/if.h>
#include <villas/kernel/tc.h>
#include <villas/kernel/tc_netem.h>
#include <villas/kernel/nl.h>
#include <villas/kernel/kernel.h>
#include <villas/nodes/socket.h>
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int if_init(struct interface *i, struct rtnl_link *link)
{
i->nl_link = link;
debug(LOG_IF | 3, "Created interface '%s'", rtnl_link_get_name(i->nl_link));
int n = if_get_irqs(i);
if (n > 0)
debug(6, "Found %u IRQs for interface '%s'", n, rtnl_link_get_name(i->nl_link));
else
warn("Did not found any interrupts for interface '%s'", rtnl_link_get_name(i->nl_link));
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list_init(&i->sockets);
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return 0;
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}
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int if_destroy(struct interface *i)
{
/* List members are freed by the nodes they belong to. */
list_destroy(&i->sockets, NULL, false);
rtnl_qdisc_put(i->tc_qdisc);
free(i);
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return 0;
}
int if_start(struct interface *i)
{
info("Starting interface '%s' which is used by %zu sockets", rtnl_link_get_name(i->nl_link), list_length(&i->sockets));
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{
/* Set affinity for network interfaces (skip _loopback_ dev) */
//if_set_affinity(i, i->affinity);
/* Assign fwmark's to socket nodes which have netem options */
int ret, mark = 0;
for (size_t j = 0; j < list_length(&i->sockets); j++) {
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struct socket *s = (struct socket *) list_at(&i->sockets, j);
if (s->tc_qdisc)
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s->mark = 1 + mark++;
}
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/* Abort if no node is using netem */
if (mark == 0)
return 0;
if (getuid() != 0)
error("Network emulation requires super-user privileges!");
/* Replace root qdisc */
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ret = tc_prio(i, &i->tc_qdisc, TC_HANDLE(1, 0), TC_H_ROOT, mark);
if (ret)
error("Failed to setup priority queuing discipline: %s", nl_geterror(ret));
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/* Create netem qdisks and appropriate filter per netem node */
for (size_t j = 0; j < list_length(&i->sockets); j++) {
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struct socket *s = (struct socket *) list_at(&i->sockets, j);
if (s->tc_qdisc) {
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ret = tc_mark(i, &s->tc_classifier, TC_HANDLE(1, s->mark), s->mark);
if (ret)
error("Failed to setup FW mark classifier: %s", nl_geterror(ret));
char *buf = tc_netem_print(s->tc_qdisc);
debug(LOG_IF | 5, "Starting network emulation on interface '%s' for FW mark %u: %s",
rtnl_link_get_name(i->nl_link), s->mark, buf);
free(buf);
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ret = tc_netem(i, &s->tc_qdisc, TC_HANDLE(0x1000+s->mark, 0), TC_HANDLE(1, s->mark));
if (ret)
error("Failed to setup netem qdisc: %s", nl_geterror(ret));
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}
}
}
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return 0;
}
int if_stop(struct interface *i)
{
info("Stopping interface '%s'", rtnl_link_get_name(i->nl_link));
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if_set_affinity(i, -1L);
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if (i->tc_qdisc)
tc_reset(i);
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return 0;
}
int if_get_egress(struct sockaddr *sa, struct rtnl_link **link)
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{
int ifindex = -1;
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switch (sa->sa_family) {
case AF_INET:
case AF_INET6: {
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struct sockaddr_in *sin = (struct sockaddr_in *) sa;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) sa;
struct nl_addr *addr = (sa->sa_family == AF_INET)
? nl_addr_build(sin->sin_family, &sin->sin_addr.s_addr, sizeof(sin->sin_addr.s_addr))
: nl_addr_build(sin6->sin6_family, sin6->sin6_addr.s6_addr, sizeof(sin6->sin6_addr));
ifindex = nl_get_egress(addr); nl_addr_put(addr);
if (ifindex < 0)
error("Netlink error: %s", nl_geterror(ifindex));
break;
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}
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case AF_PACKET: {
struct sockaddr_ll *sll = (struct sockaddr_ll *) sa;
ifindex = sll->sll_ifindex;
break;
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}
}
struct nl_cache *cache = nl_cache_mngt_require("route/link");
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*link = rtnl_link_get(cache, ifindex);
if (!*link)
return -1;
return 0;
}
int if_get_irqs(struct interface *i)
{
char dirname[NAME_MAX];
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int irq, n = 0;
snprintf(dirname, sizeof(dirname), "/sys/class/net/%s/device/msi_irqs/", rtnl_link_get_name(i->nl_link));
DIR *dir = opendir(dirname);
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if (dir) {
memset(&i->irqs, 0, sizeof(char) * IF_IRQ_MAX);
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struct dirent *entry;
while ((entry = readdir(dir)) && n < IF_IRQ_MAX) {
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irq = atoi(entry->d_name);
if (irq)
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i->irqs[n++] = irq;
}
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closedir(dir);
}
return 0;
}
int if_set_affinity(struct interface *i, int affinity)
{
char filename[NAME_MAX];
FILE *file;
for (int n = 0; n < IF_IRQ_MAX && i->irqs[n]; n++) {
snprintf(filename, sizeof(filename), "/proc/irq/%u/smp_affinity", i->irqs[n]);
file = fopen(filename, "w");
if (file) {
if (fprintf(file, "%8x", affinity) < 0)
error("Failed to set affinity for IRQ %u", i->irqs[n]);
fclose(file);
debug(LOG_IF | 5, "Set affinity of IRQ %u for interface '%s' to %#x", i->irqs[n], rtnl_link_get_name(i->nl_link), affinity);
}
else
error("Failed to set affinity for interface '%s'", rtnl_link_get_name(i->nl_link));
}
return 0;
}