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| 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/interface.c | |
| parent | 4db78d31deff77f227de56316ee865d65eaa7f01 (diff) | |
| download | linux-210c34dcd8d912dcc740f1f17625a7293af5cb56.tar.gz linux-210c34dcd8d912dcc740f1f17625a7293af5cb56.tar.bz2 linux-210c34dcd8d912dcc740f1f17625a7293af5cb56.zip | |
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/interface.c')
| -rw-r--r-- | drivers/net/xen-netback/interface.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c index 28577a31549d..e7bd63eb2876 100644 --- a/drivers/net/xen-netback/interface.c +++ b/drivers/net/xen-netback/interface.c @@ -171,6 +171,13 @@ static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev) !xenvif_schedulable(vif)) goto drop; + if (vif->multicast_control && skb->pkt_type == PACKET_MULTICAST) { + struct ethhdr *eth = (struct ethhdr *)skb->data; + + if (!xenvif_mcast_match(vif, eth->h_dest)) + goto drop; + } + cb = XENVIF_RX_CB(skb); cb->expires = jiffies + vif->drain_timeout; @@ -427,6 +434,7 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid, vif->num_queues = 0; spin_lock_init(&vif->lock); + INIT_LIST_HEAD(&vif->fe_mcast_addr); dev->netdev_ops = &xenvif_netdev_ops; dev->hw_features = NETIF_F_SG | @@ -661,6 +669,8 @@ void xenvif_disconnect(struct xenvif *vif) xenvif_unmap_frontend_rings(queue); } + + xenvif_mcast_addr_list_free(vif); } /* Reverse the relevant parts of xenvif_init_queue(). |