This patch adds a specification for a 'carrier' node in xenstore to allow a backend to notify a frontend of it's virtual carrier/link state. E.g. a backend that is unable to forward packets from the guest because it is not attached to a bridge may wish to advertise 'no carrier'.
NOTE: This is purely a documentation patch. No functional change. Signed-off-by: Paul Durrant <pdurr...@amazon.com> --- Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com> Cc: Juergen Gross <jgr...@suse.com> --- xen/include/public/io/netif.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/xen/include/public/io/netif.h b/xen/include/public/io/netif.h index 2454448baa..e587055f68 100644 --- a/xen/include/public/io/netif.h +++ b/xen/include/public/io/netif.h @@ -190,6 +190,20 @@ * order as requests. */ +/* + * Link state + * ========== + * + * The backend can advertise it is current link (carrier) state to the + * frontend using the /local/domain/X/backend/<domid>/<vif>/carrier node. + * If this node is not present, then the frontend should assume that the + * link is up (for compatibility with backends that do no implement this + * feature). If this node is present, then a value of "0" should be + * interpreted by the frontend as the link being down (no carrier) and a + * value of "1" should be interpreted as the link being up (carrier + * present). + */ + /* * Hash types * ========== -- 2.20.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
