diff options
| author | Paul Durrant <Paul.Durrant@citrix.com> | 2015-09-02 17:58:36 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-09-02 11:45:00 -0700 |
| commit | 210c34dcd8d912dcc740f1f17625a7293af5cb56 (patch) | |
| tree | 33b7944163879cad30a6e631490ad6d2d3297164 /drivers/net/xen-netback/common.h | |
| parent | 4db78d31deff77f227de56316ee865d65eaa7f01 (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 'drivers/net/xen-netback/common.h')
| -rw-r--r-- | drivers/net/xen-netback/common.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h index c6cb85a85c89..6dc76c1e807b 100644 --- a/drivers/net/xen-netback/common.h +++ b/drivers/net/xen-netback/common.h @@ -210,12 +210,22 @@ enum state_bit_shift { VIF_STATUS_CONNECTED, }; +struct xenvif_mcast_addr { + struct list_head entry; + struct rcu_head rcu; + u8 addr[6]; +}; + +#define XEN_NETBK_MCAST_MAX 64 + struct xenvif { /* Unique identifier for this interface. */ domid_t domid; unsigned int handle; u8 fe_dev_addr[6]; + struct list_head fe_mcast_addr; + unsigned int fe_mcast_count; /* Frontend feature information. */ int gso_mask; @@ -224,6 +234,7 @@ struct xenvif { u8 can_sg:1; u8 ip_csum:1; u8 ipv6_csum:1; + u8 multicast_control:1; /* Is this interface disabled? True when backend discovers * frontend is rogue. @@ -341,4 +352,8 @@ void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue, struct sk_buff *skb); void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue); +/* Multicast control */ +bool xenvif_mcast_match(struct xenvif *vif, const u8 *addr); +void xenvif_mcast_addr_list_free(struct xenvif *vif); + #endif /* __XEN_NETBACK__COMMON_H__ */ |