[libvirt] [PATCH] more interface functions; some needed for VEPA

[Vivek Kashyap]

On Fri, 7 May 2010, Stefan Berger wrote:

> Then there is a new function that reads the VLANid of a VLAN interface
> via an ioctl(). This one will be needed by upcoming VEPA related
> patches.

Yes, this is needed by VEPA. With this patch it should be possible to 
collect all the components required for the VEPA (for VSI discovery protocol).

As per your/David's earlier RFC for sending the netlink message to
the VSI engine (LLDPAD), the netlink message will need to contain:

1. 'Port profile'  comprising of :
 	VSI Manager ID      1 octet
 	VSI Type ID         3 octets
 	VSI Type ID Version 1 octet
 	VSI Instance ID    16 octets

Therefore need to extend the domain xml to take the above 4 values.

reference, Pg 50 of the proposal here
 	http://www.ieee802.org/1/files/public/docs2010/bg-joint-evb-0410v1.pdf

2. MAC address (of the virtual interface)

3. VLAN tag  (associtaed with the virtual interface)

thanks
 	Vivek



>
> On cygwin for example none of the newly added functions are available.
> The flags related function could not be exported due to missing
> PF_PACKET -- or maybe other type of protocol that needs to be used when
> opening the socket for running the ioctl() on.
>
> Signed-off-by: Stefan Berger <stefanb at us.ibm.com>
>
<..snip>
> +
> +#ifdef __linux__
> +int
> +ifaceGetVlanID(const char *vlanifname, int *vlanid) {
> +    struct vlan_ioctl_args vlanargs = {
> +      .cmd = GET_VLAN_VID_CMD,
> +    };
> +    int rc = 0;
> +    int fd = socket(PF_PACKET, SOCK_DGRAM, 0);
> +
> +    if (fd < 0)
> +        return errno;
> +
> +    if (virStrcpyStatic(vlanargs.device1, vlanifname) == NULL) {
> +        rc = EINVAL;
> +        goto err_exit;
> +    }
> +
> +    if (ioctl(fd, SIOCGIFVLAN, &vlanargs) != 0) {
> +        rc = errno;
> +        goto err_exit;
> +    }
> +
> +    *vlanid = vlanargs.u.VID;
> +
> + err_exit:
> +    close(fd);
> +
> +    return rc;
> +}
> +
> +#else
> +
> +int
> +ifaceGetVlanID(const char *vlanifname ATTRIBUTE_UNUSED,
> +               int *vlanid ATTRIBUTE_UNUSED) {
> +
> +    ifaceError(VIR_ERR_INTERNAL_ERROR, "%s",
> +               _("ifaceGetVlanID is not supported on non-linux platforms"));
> +
> +    return ENOSYS;
> +}
> +#endif /* __linux__ */
> Index: libvirt-acl/src/util/interface.h
> ===================================================================
> --- libvirt-acl.orig/src/util/interface.h
> +++ libvirt-acl/src/util/interface.h
> @@ -12,6 +12,9 @@
>
> # include "datatypes.h"
>
> +int ifaceGetFlags(const char *name, short *flags);
> +int ifaceIsUp(const char *name, bool *up);
> +
> int ifaceCtrl(const char *name, bool up);
>
> static inline int ifaceUp(const char *name) {
> @@ -27,4 +30,6 @@ int ifaceCheck(bool reportError, const c
>
> int ifaceGetIndex(bool reportError, const char *ifname, int *ifindex);
>
> +int ifaceGetVlanID(const char *vlanifname, int *vlanid);
> +
> #endif /* __VIR_INTERFACE_H__ */
> Index: libvirt-acl/src/libvirt_private.syms
> ===================================================================
> --- libvirt-acl.orig/src/libvirt_private.syms
> +++ libvirt-acl/src/libvirt_private.syms
> @@ -685,6 +685,9 @@ virArgvToString;
> ifaceCtrl;
> ifaceCheck;
> ifaceGetIndex;
> +ifaceGetFlags;
> +ifaceIsUp;
> +ifaceGetVlanID;
>
> # usb.h
> usbGetDevice;
>
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