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Date: Tue, 8 Nov 2011 10:31:35 -0800
From: "Rose, Gregory V" <gregory.v.rose@...el.com>
To: Roopa Prabhu <roprabhu@...co.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: "sri@...ibm.com" <sri@...ibm.com>,
"dragos.tatulea@...il.com" <dragos.tatulea@...il.com>,
"arnd@...db.de" <arnd@...db.de>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"mst@...hat.com" <mst@...hat.com>,
"davem@...emloft.net" <davem@...emloft.net>,
"mchan@...adcom.com" <mchan@...adcom.com>,
"dwang2@...co.com" <dwang2@...co.com>,
"shemminger@...tta.com" <shemminger@...tta.com>,
"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
"kaber@...sh.net" <kaber@...sh.net>,
"benve@...co.com" <benve@...co.com>
Subject: RE: [net-next-2.6 PATCH 0/8 RFC v2] macvlan: MAC Address filtering
support for passthru mode
> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
> On Behalf Of Roopa Prabhu
> Sent: Tuesday, October 18, 2011 11:26 PM
> To: netdev@...r.kernel.org
> Cc: sri@...ibm.com; dragos.tatulea@...il.com; arnd@...db.de;
> kvm@...r.kernel.org; mst@...hat.com; davem@...emloft.net;
> mchan@...adcom.com; dwang2@...co.com; shemminger@...tta.com;
> eric.dumazet@...il.com; kaber@...sh.net; benve@...co.com
> Subject: [net-next-2.6 PATCH 0/8 RFC v2] macvlan: MAC Address filtering
> support for passthru mode
>
> v1 version of this RFC patch was posted at
> http://www.spinics.net/lists/netdev/msg174245.html
>
> Today macvtap used in virtualized environment does not have support to
> propagate MAC, VLAN and interface flags from guest to lowerdev.
> Which means to be able to register additional VLANs, unicast and multicast
> addresses or change pkt filter flags in the guest, the lowerdev has to be
> put in promisocous mode. Today the only macvlan mode that supports this is
> the PASSTHRU mode and it puts the lower dev in promiscous mode.
>
> PASSTHRU mode was added primarily for the SRIOV usecase. In PASSTHRU mode
> there is a 1-1 mapping between macvtap and physical NIC or VF.
>
> There are two problems with putting the lowerdev in promiscous mode (ie
> SRIOV
> VF's):
> - Some SRIOV cards dont support promiscous mode today (Thread on
> Intel
> driver indicates that http://lists.openwall.net/netdev/2011/09/27/6)
> - For the SRIOV NICs that support it, Putting the lowerdev in
> promiscous mode leads to additional traffic being sent up to the
> guest virtio-net to filter result in extra overheads.
>
> Both the above problems can be solved by offloading filtering to the
> lowerdev hw. ie lowerdev does not need to be in promiscous mode as
> long as the guest filters are passed down to the lowerdev.
>
> This patch basically adds the infrastructure to set and get MAC and VLAN
> filters on an interface via rtnetlink. And adds support in macvlan and
> macvtap
> to allow set and get filter operations.
>
> Earlier version of this patch provided the TUNSETTXFILTER macvtap
> interface
> for setting address filtering. In response to feedback, This version
> introduces a netlink interface for the same.
>
> Response to some of the questions raised during v1:
>
> - Netlink interface:
> This patch provides the following netlink interface to set mac and
> vlan
> filters :
> [IFLA_RX_FILTER] = {
> [IFLA_ADDR_FILTER] = {
> [IFLA_ADDR_FILTER_FLAGS]
> [IFLA_ADDR_FILTER_UC_LIST] = {
> [IFLA_ADDR_LIST_ENTRY]
> }
> [IFLA_ADDR_FILTER_MC_LIST] = {
> [IFLA_ADDR_LIST_ENTRY]
> }
> }
> [IFLA_VLAN_FILTER] = {
> [IFLA_VLAN_BITMAP]
> }
> }
>
> Note: The IFLA_VLAN_FILTER is a nested attribute and contains only
> IFLA_VLAN_BITMAP today. The idea is that the IFLA_VLAN_FILTER can
> be extended tomorrow to use a vlan list option if some
> implementations
> prefer a list instead.
>
> And it provides the following rtnl_link_ops to set/get MAC/VLAN
> filters:
>
> int (*set_rx_addr_filter)(struct net_device
> *dev,
> struct nlattr *tb[]);
> int (*set_rx_vlan_filter)(struct net_device
> *dev,
> struct nlattr *tb[]);
> size_t (*get_rx_addr_filter_size)(const struct
> net_device *dev);
> size_t (*get_rx_vlan_filter_size)(const struct
> net_device *dev);
> int (*fill_rx_addr_filter)(struct sk_buff *skb,
> const struct net_device
> *dev);
> int (*fill_rx_vlan_filter)(struct sk_buff *skb,
> const struct net_device
> *dev);
>
>
> Note: The choice of rtnl_link_ops was because I saw the use case for
> this in virtual devices that need to do filtering in sw like
> macvlan
> and tun. Hw devices usually have filtering in hw with netdev->uc and
> mc lists to indicate active filters. But I can move from
> rtnl_link_ops
> to netdev_ops if that is the preferred way to go and if there is a
> need to support this interface on all kinds of interfaces.
> Please suggest.
>
> - Protection against address spoofing:
> - This patch adds filtering support only for macvtap PASSTHRU
> Mode. PASSTHRU mode is used mainly with SRIOV VF's. And SRIOV VF's
> come with anti mac/vlan spoofing support. (Recently added
> IFLA_VF_SPOOFCHK). In 802.1Qbh case the port profile has a knob to
> enable/disable anti spoof check. Lowerdevice drivers also enforce
> limits
> on the number of address registrations allowed.
>
> - Support for multiqueue devices: Enable filtering on individual queues
> (?):
> AFAIK, there is no netdev interface to install per queue hw
> filters for a multi queue interface. And also I dont know of any hw
> that provides an interface to set hw filters on a per queue basis.
> A multi queue device appears as a single lowerdev (ie netdev) and
> uses the same uc and mc lists to setup unicast and multicast hw
> filters.
> So i dont see a huge problem with this patch coming in the way for
> multi queue devices.
>
> - Support for non-PASSTHRU mode:
> I started implementing this. But there are a couple of problems.
> - The lowerdev may not be a SRIOV VF and may not have
> anti spoof capability
> - Today, in non-PASSTHRU cases macvlan_handle_frame assumes that
> every macvlan device on top of the lowerdev has a single unique mac.
> And the macvlans are hashed on that single mac address.
> To support filtering for non-PASSTHRU mode in addition to this
> patch the following needs to be done:
> - non-passthru mode with a single macvlan over a lower dev
> can be treated as PASSTHRU case
> - For non-PASSTHRU mode with multiple macvlans over a single
> lower dev:
> - Multiple unicast mac's now need to be hashed to the
> same macvlan device. The macvlan hash needs to change
> for lookup based on any one of the multiple unicast
> addresses a macvlan is interested in
> - We need to consider vlans during the lookup too
> - So the macvlan device hash needs to hash on both mac
> and vlan
> - But the support for filtering in non-PASSTHRU mode can be
> built on this patch
>
> This patch series implements the following
> 01/8 rtnetlink: Netlink interface for setting MAC and VLAN filters
> 02/8 rtnetlink: Add rtnl link operations for MAC address and VLAN
> filtering
> 03/8 rtnetlink: Add support to set MAC/VLAN filters
> 04/8 rtnetlink: Add support to get MAC/VLAN filters
> 05/8 macvlan: Add support to set MAC/VLAN filter rtnl link operations
> 06/8 macvlan: Add support to get MAC/VLAN filter rtnl link operations
> 07/8 macvtap: Add support to set MAC/VLAN filter rtnl link operations
> 08/8 macvtap: Add support to get MAC/VLAN filter rtnl link operations
>
> Please comment. Thanks.
I have finished my preliminary evaluation and testing of these RFC patches and find that the features that we would require are present and functional. I haven't fully fleshed out the 'get' operations in my own driver yet but the 'set' routines are all doing what we need them to do.
Thanks for your work on this Roopa!
- Greg
>
> Signed-off-by: Roopa Prabhu <roprabhu@...co.com>
> Signed-off-by: Christian Benvenuti <benve@...co.com>
> Signed-off-by: David Wang <dwang2@...co.com>
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