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virnetdev: Introduce virNetDevGetLinkInfo
The purpose of this function is to fetch link state and link speed for given NIC name from the SYSFS. Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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3db89662c2
commit
05630cf4e5
@ -1542,6 +1542,7 @@ virNetDevClearIPv4Address;
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virNetDevExists;
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virNetDevGetIndex;
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virNetDevGetIPv4Address;
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virNetDevGetLinkInfo;
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virNetDevGetMAC;
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virNetDevGetMTU;
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virNetDevGetPhysicalFunction;
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@ -1832,3 +1832,97 @@ virNetDevRestoreNetConfig(const char *linkdev ATTRIBUTE_UNUSED,
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}
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#endif /* defined(__linux__) && defined(HAVE_LIBNL) */
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#ifdef __linux__
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int
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virNetDevGetLinkInfo(const char *ifname,
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virInterfaceLinkPtr lnk)
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{
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int ret = -1;
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char *path = NULL;
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char *buf = NULL;
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char *tmp;
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int tmp_state;
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unsigned int tmp_speed;
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if (virNetDevSysfsFile(&path, ifname, "operstate") < 0)
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goto cleanup;
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if (virFileReadAll(path, 1024, &buf) < 0) {
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virReportSystemError(errno,
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_("unable to read: %s"),
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path);
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goto cleanup;
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}
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if (!(tmp = strchr(buf, '\n'))) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Unable to parse: %s"),
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buf);
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goto cleanup;
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}
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*tmp = '\0';
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/* We shouldn't allow 0 here, because
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* virInterfaceState enum starts from 1. */
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if ((tmp_state = virInterfaceStateTypeFromString(buf)) <= 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Unable to parse: %s"),
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buf);
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goto cleanup;
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}
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lnk->state = tmp_state;
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VIR_FREE(path);
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VIR_FREE(buf);
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if (virNetDevSysfsFile(&path, ifname, "speed") < 0)
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goto cleanup;
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if (virFileReadAll(path, 1024, &buf) < 0) {
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/* Some devices doesn't report speed, in which case we get EINVAL */
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if (errno == EINVAL) {
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ret = 0;
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goto cleanup;
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}
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virReportSystemError(errno,
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_("unable to read: %s"),
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path);
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goto cleanup;
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}
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if (virStrToLong_ui(buf, &tmp, 10, &tmp_speed) < 0 ||
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*tmp != '\n') {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Unable to parse: %s"),
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buf);
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goto cleanup;
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}
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/* Workaround broken kernel API. If the link is unplugged then
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* depending on the NIC driver, link speed can be reported as -1.
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* However, the value is printed out as unsigned integer instead of
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* signed one. Terrifying but true. */
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lnk->speed = (int) tmp_speed == -1 ? 0 : tmp_speed;
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ret = 0;
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cleanup:
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VIR_FREE(buf);
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VIR_FREE(path);
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return ret;
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}
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#else
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int
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virNetDevGetLinkInfo(const char *ifname,
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virInterfaceLinkPtr lnk)
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{
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/* Port me */
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VIR_DEBUG("Getting link info on %s is not implemented on this platform");
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lnk->speed = lnk->state = 0;
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return 0;
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}
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#endif /* defined(__linux__) */
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@ -29,6 +29,7 @@
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# include "virnetlink.h"
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# include "virmacaddr.h"
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# include "virpci.h"
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# include "device_conf.h"
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# ifdef HAVE_STRUCT_IFREQ
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typedef struct ifreq virIfreq;
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@ -145,4 +146,8 @@ int virNetDevGetVirtualFunctionInfo(const char *vfname, char **pfname,
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int *vf)
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ATTRIBUTE_NONNULL(1);
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int virNetDevGetLinkInfo(const char *ifname,
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virInterfaceLinkPtr lnk)
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ATTRIBUTE_NONNULL(1);
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#endif /* __VIR_NETDEV_H__ */
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