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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.
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@ -2010,6 +2010,7 @@ virNetDevGetVLanID;
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virNetDevIfStateTypeFromString;
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virNetDevIfStateTypeToString;
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virNetDevIsVirtualFunction;
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virNetDevPFGetVF;
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virNetDevReplaceMacAddress;
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virNetDevReplaceNetConfig;
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virNetDevRestoreMacAddress;
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@ -1380,6 +1380,57 @@ virNetDevGetPhysicalFunction(const char *ifname, char **pfname)
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return ret;
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}
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/**
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* virNetDevPFGetVF:
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*
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* @pfname: netdev name of the physical function (PF)
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* @vf: virtual function (VF) number for the device of interest
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* @vfname: name of the physical function interface name
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*
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* Finds the netdev name of VF# @vf of SRIOV PF @pfname, and puts it
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* in @vfname. The caller must free @vfname when it's finished with
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* it.
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*
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* Returns 0 on success, -1 on failure
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*
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* NB: if the VF has no netdev name, that is *not* considered an
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* error; *vfname simply gets a NULL and the return value is 0
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* (success).
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*/
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int
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virNetDevPFGetVF(const char *pfname, int vf, char **vfname)
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{
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char *virtfnName = NULL;
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char *virtfnSysfsPath = NULL;
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int ret = -1;
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if (virAsprintf(&virtfnName, "virtfn%d", vf) < 0)
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goto cleanup;
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/* this provides the path to the VF's directory in sysfs,
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* e.g. "/sys/class/net/enp2s0f0/virtfn3"
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*/
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if (virNetDevSysfsDeviceFile(&virtfnSysfsPath, pfname, virtfnName) < 0)
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goto cleanup;
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/* and this gets the netdev name associated with it, which is a
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* directory entry in [virtfnSysfsPath]/net,
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* e.g. "/sys/class/net/enp2s0f0/virtfn3/net/enp2s11f4" - in this
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* example the VF for enp2s0f0 vf#3 is "enp2s11f4". (If the VF
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* isn't bound to a netdev driver, it won't have a netdev name,
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* and vfname will be NULL).
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*/
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ret = virPCIGetNetName(virtfnSysfsPath, vfname);
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cleanup:
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VIR_FREE(virtfnName);
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VIR_FREE(virtfnSysfsPath);
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return ret;
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}
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/**
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* virNetDevGetVirtualFunctionInfo:
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* @vfname: name of the virtual function interface
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@ -1459,6 +1510,16 @@ virNetDevGetPhysicalFunction(const char *ifname ATTRIBUTE_UNUSED,
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return -1;
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}
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int
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virNetDevPFGetVF(const char *pfname ATTRIBUTE_UNUSED,
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int vf ATTRIBUTE_UNUSED,
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char **vfname ATTRUBUTE_UNUSED)
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{
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virReportSystemError(ENOSYS, "%s",
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_("Unable to get virtual function name on this platform"));
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return -1;
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}
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int
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virNetDevGetVirtualFunctionInfo(const char *vfname ATTRIBUTE_UNUSED,
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char **pfname ATTRIBUTE_UNUSED,
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@ -183,6 +183,9 @@ int virNetDevGetVirtualFunctionIndex(const char *pfname, const char *vfname,
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int virNetDevGetPhysicalFunction(const char *ifname, char **pfname)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
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int virNetDevPFGetVF(const char *pfname, int vf, char **vfname)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
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int virNetDevGetVirtualFunctions(const char *pfname,
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char ***vfname,
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virPCIDeviceAddressPtr **virt_fns,
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