mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-23 00:00:01 +01:00
Steffen Vogel
bbe2a6a02e
git-svn-id: https://zerberus.eonerc.rwth-aachen.de:8443/svn/s2ss/trunk@134 8ec27952-4edc-4aab-86aa-e87bb2611832
101 lines
2 KiB
C
101 lines
2 KiB
C
/** Interface related functions
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014, Institute for Automation of Complex Power Systems, EONERC
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dirent.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include "if.h"
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#include "utils.h"
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int if_getegress(struct sockaddr_in *sa)
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{
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char cmd[128];
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char token[32];
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snprintf(cmd, sizeof(cmd), "ip route get %s", inet_ntoa(sa->sin_addr));
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debug(8, "System: %s", cmd);
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FILE *p = popen(cmd, "r");
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if (!p)
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return -1;
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while (!feof(p) && fscanf(p, "%31s", token)) {
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if (!strcmp(token, "dev")) {
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fscanf(p, "%31s", token);
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break;
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}
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}
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return (WEXITSTATUS(fclose(p))) ? -1 : if_nametoindex(token);
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}
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int if_getirqs(struct interface *i)
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{
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char dirname[NAME_MAX];
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DIR *dir;
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snprintf(dirname, sizeof(dirname), "/sys/class/net/%s/device/msi_irqs/", i->name);
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dir = opendir(dirname);
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if (!dir)
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return -1;
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memset(&i->irqs, 0, sizeof(char) * IF_IRQ_MAX);
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int n = 0;
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struct dirent *entry;
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while ((entry = readdir(dir)) && n < IF_IRQ_MAX) {
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if (entry->d_type & DT_REG) {
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i->irqs[n++] = atoi(entry->d_name);
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}
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}
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debug(7, "Found %u interrupts for interface '%s'", n, i->name);
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closedir(dir);
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return 0;
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}
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int if_setaffinity(struct interface *i, int affinity)
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{
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char filename[NAME_MAX];
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FILE *file;
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for (int n = 0; n < IF_IRQ_MAX && i->irqs[n]; n++) {
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snprintf(filename, sizeof(filename), "/proc/irq/%u/smp_affinity", i->irqs[n]);
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file = fopen(filename, "w");
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if (file) {
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if (fprintf(file, "%8x", affinity) < 0)
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error("Failed to set affinity for IRQ %u", i->irqs[n]);
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fclose(file);
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debug(5, "Set affinity of IRQ %u for interface '%s' to %#x", i->irqs[n], i->name, affinity);
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}
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}
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return 0;
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}
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struct interface* if_lookup_index(int index, struct interface *interfaces)
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{
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for (struct interface *i = interfaces; i; i = i->next) {
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if (i->index == index) {
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return i;
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}
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}
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return NULL;
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}
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