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authorPaul Durrant <Paul.Durrant@citrix.com>2015-09-02 17:58:36 +0100
committerDavid S. Miller <davem@davemloft.net>2015-09-02 11:45:00 -0700
commit210c34dcd8d912dcc740f1f17625a7293af5cb56 (patch)
tree33b7944163879cad30a6e631490ad6d2d3297164 /include/xen
parent4db78d31deff77f227de56316ee865d65eaa7f01 (diff)
xen-netback: add support for multicast control
Xen's PV network protocol includes messages to add/remove ethernet multicast addresses to/from a filter list in the backend. This allows the frontend to request the backend only forward multicast packets which are of interest thus preventing unnecessary noise on the shared ring. The canonical netif header in git://xenbits.xen.org/xen.git specifies the message format (two more XEN_NETIF_EXTRA_TYPEs) so the minimal necessary changes have been pulled into include/xen/interface/io/netif.h. To prevent the frontend from extending the multicast filter list arbitrarily a limit (XEN_NETBK_MCAST_MAX) has been set to 64 entries. This limit is not specified by the protocol and so may change in future. If the limit is reached then the next XEN_NETIF_EXTRA_TYPE_MCAST_ADD sent by the frontend will be failed with NETIF_RSP_ERROR. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Cc: Ian Campbell <ian.campbell@citrix.com> Cc: Wei Liu <wei.liu2@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/interface/io/netif.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/include/xen/interface/io/netif.h b/include/xen/interface/io/netif.h
index 70054cc0708d..252ffd4801ef 100644
--- a/include/xen/interface/io/netif.h
+++ b/include/xen/interface/io/netif.h
@@ -156,7 +156,9 @@ struct xen_netif_tx_request {
/* Types of xen_netif_extra_info descriptors. */
#define XEN_NETIF_EXTRA_TYPE_NONE (0) /* Never used - invalid */
#define XEN_NETIF_EXTRA_TYPE_GSO (1) /* u.gso */
-#define XEN_NETIF_EXTRA_TYPE_MAX (2)
+#define XEN_NETIF_EXTRA_TYPE_MCAST_ADD (2) /* u.mcast */
+#define XEN_NETIF_EXTRA_TYPE_MCAST_DEL (3) /* u.mcast */
+#define XEN_NETIF_EXTRA_TYPE_MAX (4)
/* xen_netif_extra_info flags. */
#define _XEN_NETIF_EXTRA_FLAG_MORE (0)
@@ -201,6 +203,10 @@ struct xen_netif_extra_info {
uint16_t features; /* XEN_NETIF_GSO_FEAT_* */
} gso;
+ struct {
+ uint8_t addr[6]; /* Address to add/remove. */
+ } mcast;
+
uint16_t pad[3];
} u;
};

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