Re: [libvirt] [PATCH 10/19] util: new function virNetDevPFGetVF()

Given an SRIOV PF netdev name (e.g. "enp2s0f0") and VF#, this new function returns the netdev name of the referenced VF device (e.g. "enp2s11f6"), or NULL if the device isn't bound to a net driver. --- src/libvirt_private.syms | 1 + src/util/virnetdev.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++ src/util/virnetdev.h | 3 +++ 3 files changed, 62 insertions(+) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index ef027cc..e9705ae 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -1997,6 +1997,7 @@ virNetDevGetVLanID; virNetDevIfStateTypeFromString; virNetDevIfStateTypeToString; virNetDevIsVirtualFunction; +virNetDevPFGetVF; virNetDevReplaceMacAddress; virNetDevReplaceNetConfig; virNetDevRestoreMacAddress; diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c index ffc2fb4..49a11f3 100644 --- a/src/util/virnetdev.c +++ b/src/util/virnetdev.c @@ -1311,6 +1311,54 @@ virNetDevGetPhysicalFunction(const char *ifname, char **pfname) return ret; } + +/** + * virNetDevPFGetVF: + * + * @pfname: netdev name of the physical function (PF) + * @vf: virtual function (VF) number for the device of interest + * @vfname: name of the physical function interface name + * + * Finds the netdev name of VF# @vf of SRIOV PF @pfname, and puts it + * in @vfname. The caller must free @vfname when it's finished with + * it. + * + * Returns 0 on success, -1 on failure

+ * + */ +int +virNetDevPFGetVF(const char *pfname, int vf, char **vfname) +{ + char *virtfnName = NULL; + char *virtfnSysfsPath = NULL; + int ret = -1; + + if (virAsprintf(&virtfnName, "virtfn%d", vf) < 0) + goto cleanup; + + /* this provides the path to the VF's directory in sysfs, + * e.g. "/sys/class/net/enp2s0f0/virtfn3" + */ + if (virNetDevSysfsDeviceFile(&virtfnSysfsPath, pfname, virtfnName) < 0) + goto cleanup; + + /* and this gets the netdev name associated with it, which is a + * directory entry in [virtfnSysfsPath]/net, + * e.g. "/sys/class/net/enp2s0f0/virtfn3/net/enp2s11f4" - in this + * example the VF for enp2s0f0 vf#3 is "enp2s11f4". (If the VF + * isn't bound to a netdev driver, it won't have a netdev name, + * and vfname will be NULL). + */ + ret = virPCIGetNetName(virtfnSysfsPath, vfname); + + cleanup: + VIR_FREE(virtfnName); + VIR_FREE(virtfnSysfsPath); + + return ret; +} + +