[libvirt] [PATCH 3/4 v2] interface: Add functions to get sriov PF/VF relationship of a net interface

[Roopa Prabhu]

On 8/15/11 4:13 AM, "Stefan Berger" <stefanb at linux.vnet.ibm.com> wrote:

> On 08/12/2011 07:14 PM, Roopa Prabhu wrote:
>> From: Roopa Prabhu<roprabhu at cisco.com>
>> 
>> This patch adds the following functions to get PF/VF relationship of an SRIOV
>> network interface:
>> ifaceIsVirtualFunction: Function to check if a network interface is a SRIOV
>> VF
>> ifaceGetVirtualFunctionIndex: Function to get VF index if a network interface
>> is a SRIOV VF
>> ifaceGetPhysicalFunction: Function to get the PF net interface name of a
>> SRIOV VF net interface
>> 
>> Signed-off-by: Roopa Prabhu<roprabhu at cisco.com>
>> Signed-off-by: Christian Benvenuti<benve at cisco.com>
>> Signed-off-by: David Wang<dwang2 at cisco.com>
>> ---
>>   src/util/interface.c |  150
>> ++++++++++++++++++++++++++++++++++++++++++++++++++
>>   src/util/interface.h |    9 +++
>>   2 files changed, 159 insertions(+), 0 deletions(-)
>> 
>> 
>> diff --git a/src/util/interface.c b/src/util/interface.c
>> index 8b4522b..ec00606 100644
>> --- a/src/util/interface.c
>> +++ b/src/util/interface.c
>> @@ -45,6 +45,8 @@
>>   #include "virfile.h"
>>   #include "memory.h"
>>   #include "netlink.h"
>> +#include "pci.h"
>> +#include "logging.h"
>> 
>>   #define VIR_FROM_THIS VIR_FROM_NET
>> 
>> @@ -1196,3 +1198,151 @@ ifaceRestoreMacAddress(const char *linkdev,
>> 
>>       return rc;
>>   }
>> +
>> +#if __linux__
>> +static int
>> +ifaceSysfsFile(char **pf_sysfs_device_link, const char *ifname,
>> +               const char *file)
>> +{
>> +
>> +    if (virAsprintf(pf_sysfs_device_link, NET_SYSFS "%s/%s",
>> +        ifname, file)<  0) {
>> +        virReportOOMError();
>> +        return -1;
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static int
>> +ifaceSysfsDeviceFile(char **pf_sysfs_device_link, const char *ifname,
>> +                     const char *file)
>> +{
>> +
>> +    if (virAsprintf(pf_sysfs_device_link, NET_SYSFS "%s/device/%s",
>> +        ifname, file)<  0) {
>> +        virReportOOMError();
>> +        return -1;
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +/**
>> + * ifaceIsVirtualFunction
>> + *
>> + * @ifname : name of the interface
>> + *
>> + * Checks if an interface is a SRIOV virtual function.
>> + *
>> + * Returns 1 if interface is SRIOV virtual function, 0 if not and -1 if
>> error
>> + *
>> + */
>> +int
>> +ifaceIsVirtualFunction(const char *ifname)
>> +{
>> +    char *if_sysfs_device_link = NULL;
>> +    int ret = -1;
>> +
>> +    if (ifaceSysfsFile(&if_sysfs_device_link, ifname, "device"))
>> +        return ret;
>> +
>> +    ret = pciDeviceIsVirtualFunction(if_sysfs_device_link);
>> +
>> +    VIR_FREE(if_sysfs_device_link);
>> +
>> +    return ret;
>> +}
>> +
>> +/**
>> + * ifaceGetVirtualFunctionIndex
>> + *
>> + * @pfname : name of the physical function interface name
>> + * @vfname : name of the virtual function interface name
>> + * @vf_index : Pointer to int. Contains vf index of interface upon
>> successful
>> + *             return
>> + *
>> + * Returns 0 on success, -1 on failure
>> + *
>> + */
>> +int
>> +ifaceGetVirtualFunctionIndex(const char *pfname, const char *vfname,
>> +                             int *vf_index)
>> +{
>> +    char *pf_sysfs_device_link = NULL, *vf_sysfs_device_link = NULL;
>> +    int ret = -1;
>> +
>> +    if (ifaceSysfsFile(&pf_sysfs_device_link, pfname, "device"))
>> +        return ret;
>> +
>> +    if (ifaceSysfsFile(&vf_sysfs_device_link, vfname, "device")) {
>> +        VIR_FREE(pf_sysfs_device_link);
>> +        return ret;
>> +    }
>> +
>> +    ret = pciGetVirtualFunctionIndex(pf_sysfs_device_link,
>> +                                     vf_sysfs_device_link,
>> +                                     vf_index);
>> +
>> +    VIR_FREE(pf_sysfs_device_link);
>> +    VIR_FREE(vf_sysfs_device_link);
>> +
>> +    return ret;
>> +}
>> +
>> +/**
>> + * ifaceGetPhysicalFunction
>> + *
>> + * @ifname : name of the physical function interface name
>> + * @pfname : Contains sriov physical function for interface ifname
>> + *           upon successful return
>> + *
>> + * Returns 0 on success, -1 on failure
>> + *
>> + */
>> +int
>> +ifaceGetPhysicalFunction(const char *ifname, char **pfname)
>> +{
>> +    char *physfn_sysfs_path = NULL;
>> +    int ret = -1;
>> +
>> +    if (ifaceSysfsDeviceFile(&physfn_sysfs_path, ifname, "physfn"))
>> +        return ret;
>> +
>> +    ret = pciDeviceNetName(physfn_sysfs_path, pfname);
>> +
>> +    VIR_FREE(physfn_sysfs_path);
>> +
>> +    return ret;
>> +}
>> +#else
>> +
>> +int
>> +ifaceIsVirtualFunction(const char *ifname)
>> +{
>> +    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
>> +               _("ifaceIsVirtualFunction is not supported on non-linux "
>> +               "platforms"));
>> +    return -ENOSYS;
> Since above functions are described to return -1 on error, also do this
> in these ones here.

Will do. Thanks.