[libvirt] [PATCH 2/3 RFC] Add functions to get sriov PF/VF relationship of a network interface

From: Roopa Prabhu <roprabhu(a)cisco.com&gt; This patch adds helper functions to derive the PF/VF relationship of an sriov network device Signed-off-by: Roopa Prabhu <roprabhu(a)cisco.com&gt; Signed-off-by: Christian Benvenuti <benve(a)cisco.com&gt; Signed-off-by: David Wang <dwang2(a)cisco.com&gt; --- src/util/interface.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++ src/util/interface.h | 8 +++ 2 files changed, 130 insertions(+), 0 deletions(-) diff --git a/src/util/interface.c b/src/util/interface.c index f5eecfb..5ee5703 100644 --- a/src/util/interface.c +++ b/src/util/interface.c @@ -30,6 +30,7 @@ #include <sys/ioctl.h> #include <fcntl.h> #include <netinet/in.h> +#include <dirent.h> #ifdef __linux__ # include <linux/if.h> @@ -45,6 +46,8 @@ #include "virfile.h" #include "memory.h" #include "netlink.h" +#include "pci.h" +#include "logging.h" #define VIR_FROM_THIS VIR_FROM_NET @@ -1197,3 +1200,122 @@ ifaceRestoreMacAddress(const char *linkdev, return rc; } + +int ifaceIsVF(const char *ifname) +{ + char *if_sysfs_device_link = NULL; + int ret; + + if (virAsprintf(&if_sysfs_device_link, NET_SYSFS "%s/device/physfn", + ifname) < 0) { + virReportOOMError(); + return -1; + } + + ret = virFileExists(if_sysfs_device_link); + + VIR_FREE(if_sysfs_device_link); + + return ret; +} + +int ifaceGetVFIndex(const char *pfname, const char *vfname, + int *vf_index) +{ + int ret = -1; + DIR *dir = NULL; + struct dirent *entry = NULL; + char *pf_sysfs_device_link = NULL, *vf_sysfs_device_link = NULL; + char *vf_sysfs_device = NULL; + char errbuf[64]; + + if (virAsprintf(&pf_sysfs_device_link, NET_SYSFS "%s/device", + pfname) < 0) { + virReportOOMError(); + return -1; + } + + if (virAsprintf(&vf_sysfs_device_link, NET_SYSFS "%s/device", + vfname) < 0) { + VIR_FREE(pf_sysfs_device_link); + virReportOOMError(); + return -1; + } + + vf_sysfs_device = canonicalize_file_name(vf_sysfs_device_link); + if (vf_sysfs_device == NULL) { + memset(errbuf, '\0', sizeof(errbuf)); + VIR_ERROR(_("Failed to resolve device link '%s': '%s'"), + vf_sysfs_device_link, + virStrerror(errno, errbuf, sizeof(errbuf))); + VIR_FREE(pf_sysfs_device_link); + VIR_FREE(vf_sysfs_device_link); + return -1; + } + + dir = opendir(pf_sysfs_device_link); + if (dir == NULL) + goto out; + + while ((entry = readdir(dir))) { + if (STRPREFIX(entry->d_name, "virtfn")) { + char *device_link, *device_path; + + if (virBuildPath(&device_link, pf_sysfs_device_link, + entry->d_name) == -1) { + virReportOOMError(); + goto out; + } + + device_path = canonicalize_file_name(device_link); + if (device_path == NULL) { + memset(errbuf, '\0', sizeof(errbuf)); + VIR_ERROR(_("Failed to resolve device link '%s': '%s'"), + device_link, virStrerror(errno, errbuf, + sizeof(errbuf))); + VIR_FREE(device_link); + goto out; + } + + if (!strcmp(vf_sysfs_device, device_path)) { + *vf_index = atoi(entry->d_name + strlen("virtfn")); + ret = 0; + } + + VIR_FREE(device_link); + VIR_FREE(device_path); + + if ( ret == 0 ) + break; + } + } + + if (dir) + closedir(dir); + +out: + + VIR_FREE(pf_sysfs_device_link); + VIR_FREE(vf_sysfs_device_link); + VIR_FREE(vf_sysfs_device); + + return ret; +} + +int ifaceGetPFName(const char *ifname, char **pfname) +{ + char *physfn_sysfs_path = NULL; + int ret = -1; + + if (virAsprintf(&physfn_sysfs_path, NET_SYSFS "%s/device/physfn", + ifname) < 0) { + virReportOOMError(); + return -1; + } + + ret = pciDeviceGetNetName(physfn_sysfs_path, pfname); + + VIR_FREE(physfn_sysfs_path); + + return ret; +} diff --git a/src/util/interface.h b/src/util/interface.h index 9647653..f2c84f8 100644 --- a/src/util/interface.h +++ b/src/util/interface.h @@ -26,6 +26,8 @@ struct nlattr; # include "datatypes.h" # include "network.h" +#define NET_SYSFS "/sys/class/net/" + int ifaceGetFlags(const char *name, short *flags); int ifaceIsUp(const char *name, bool *up); @@ -76,4 +78,10 @@ int ifaceReplaceMacAddress(const unsigned char *macaddress, int ifaceRestoreMacAddress(const char *linkdev, const char *stateDir); +int ifaceIsVF(const char *ifname); + +int ifaceGetVFIndex(const char *pfname, const char *vfname, int *vf_index); + +int ifaceGetPFName(const char *ifname, char **pfname); + #endif /* __VIR_INTERFACE_H__ */