On 07/14/2017 06:30 PM, Vivien Didelot wrote: > Hi All, > > Andrew Lunn <and...@lunn.ch> writes: > >> I've been testing IGMP snooping support with DSA, putting MDB entries >> into the switch so that traffic only goes out ports where there has >> been an interest indicated via IGMP. It mostly works, but i've come >> across one use case which does not. >> >> I have a multicast listener running on the host, performing a >> setsockopt(IP_ADD_MEMBERSHIP) on the bridge interface. It is not an >> unreasonable thing to want to do, e.g. a WiFi access point listening >> to mDNS, or running other multicast protocols, a STB wanting to >> receive a multicast video stream to display on the set, etc. >> >> I'm not seeing any switchdev operations when the IP_ADD_MEMBERSHIP is >> called. So there is no indication that the switch should add an MDB >> entry to forward traffic to the host. >> >> Im i missing something, or is this not implemented?
You are not missing, we did not add that support yet. Currently the hardware MDB does not get updated with mcast_routers. The flood tables does get updated though. > I follow Andrew's question with another multicast issue I'm having: > > It seems like there is no way to add a multicast group via its MAC > address. All iproute2 and kernel bridge code assumes IP multicast > (0x0800 IPv4 and 0x86DD IPv6.) > > But there are valid cases where you might want to add an L2 multicast > group on a specific VLAN ID, e.g. for 0x88F7 PTP, 0x88BA Multicast > sampled values, one of the 802.1D reserved 01-80-C2-* addresses, or any > proprietary protocol addresses. > > There is the ip-maddress VLAN-unaware tool using RTM_NEWADDR which isn't > bound to switchdev, or bridge-mdb which only accepts a IPv4 or IPv6 grp. > > I tried to hack a PoC in iproute2 (http://ix.io/yuJ) but the kernel > counterpart is not trivial at all. *br_mdb_entry only play with br_ip... > > Any thoughts on this? We did not have this usecase yet, but what you say make perfect sense :) It is weird for me too that one can not configure MDB with MAC address. > > Regards, > > Vivien
