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util: new function virNetDevGetPhysPortID()
On Linux each network device *can* (but not necessarily *does*) have an attribute called phys_port_id which can be read from the file of that name in the netdev's sysfs directory. The examples I've seen have been a many-digit hexadecimal number (as an ASCII string). This value can be useful when a single PCI device is associated with multiple netdevs (e.g a dual port Mellanox SR-IOV NIC - this card has a single PCI Physical Function (PF), and that PF has two netdevs associated with it (the "net" subdirectory of the PF in sysfs has two links rather than the usual single link to a netdev directory). Each of the PF netdevs has a different phys_port_id. The Virtual Functions (VF) are similar - the PF (a PCI device) has "n" VFs (also each of these is a PCI device), each VF has two netdevs, and each of the VF netdevs points back to the VF PCI device (with the "device" entry in its sysfs directory) as well as having a phys_port_id matching the PF netdev it is associated with. virNetDevGetPhysPortID() simply attempts to read the phys_port_id for the given netdev and return it to the caller. If this particular netdev driver doesn't support phys_port_id, it returns NULL (*not* a NULL-terminated string, but a NULL pointer) but still counts it as a success.
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@ -2113,6 +2113,7 @@ virNetDevGetMTU;
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virNetDevGetName;
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virNetDevGetOnline;
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virNetDevGetPhysicalFunction;
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virNetDevGetPhysPortID;
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virNetDevGetPromiscuous;
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virNetDevGetRcvAllMulti;
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virNetDevGetRcvMulti;
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@ -1169,6 +1169,46 @@ virNetDevGetPCIDevice(const char *devName)
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}
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/**
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* virNetDevGetPhysPortID:
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*
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* @ifname: name of a netdev
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*
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* @physPortID: pointer to char* that will receive @ifname's
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* phys_port_id from sysfs (null terminated
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* string). Could be NULL if @ifname's net driver doesn't
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* support phys_port_id (most netdev drivers
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* don't). Caller is responsible for freeing the string
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* when finished.
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*
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* Returns 0 on success or -1 on failure.
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*/
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int
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virNetDevGetPhysPortID(const char *ifname,
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char **physPortID)
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{
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int ret = -1;
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char *physPortIDFile = NULL;
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*physPortID = NULL;
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if (virNetDevSysfsFile(&physPortIDFile, ifname, "phys_port_id") < 0)
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goto cleanup;
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/* a failure to read just means the driver doesn't support
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* phys_port_id, so set success now and ignore the return from
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* virFileReadAllQuiet().
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*/
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ret = 0;
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ignore_value(virFileReadAllQuiet(physPortIDFile, 1024, physPortID));
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cleanup:
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VIR_FREE(physPortIDFile);
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return ret;
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}
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/**
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* virNetDevGetVirtualFunctions:
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*
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@ -1432,6 +1472,17 @@ virNetDevGetVirtualFunctionInfo(const char *vfname, char **pfname,
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}
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#else /* !__linux__ */
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int
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virNetDevGetPhysPortID(const char *ifname ATTRIBUTE_UNUSED,
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char **physPortID)
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{
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/* this actually should never be called, and is just here to
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* satisfy the linker.
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*/
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*physPortID = NULL;
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return 0;
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}
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int
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virNetDevGetVirtualFunctions(const char *pfname ATTRIBUTE_UNUSED,
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char ***vfname ATTRIBUTE_UNUSED,
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@ -226,6 +226,11 @@ int virNetDevGetPhysicalFunction(const char *ifname, char **pfname)
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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 virNetDevGetPhysPortID(const char *ifname,
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char **physPortID)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2)
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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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