From: netdev@kapio-technology.com
To: Vladimir Oltean <olteanv@gmail.com>
Cc: Ido Schimmel <idosch@nvidia.com>,
davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org,
Andrew Lunn <andrew@lunn.ch>,
Vivien Didelot <vivien.didelot@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Jiri Pirko <jiri@resnulli.us>,
Ivan Vecera <ivecera@redhat.com>, Roopa Prabhu <roopa@nvidia.com>,
Nikolay Aleksandrov <razor@blackwall.org>,
Shuah Khan <shuah@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
linux-kernel@vger.kernel.org, bridge@lists.linux-foundation.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v4 net-next 3/6] drivers: net: dsa: add locked fdb entry flag to drivers
Date: Sun, 17 Jul 2022 15:09:10 +0200 [thread overview]
Message-ID: <a6ec816279b282a4ea72252a7400d5b3@kapio-technology.com> (raw)
In-Reply-To: <20220717125718.mj7b3j3jmltu6gm5@skbuf>
On 2022-07-17 14:57, Vladimir Oltean wrote:
> On Sun, Jul 17, 2022 at 02:21:47PM +0200, netdev@kapio-technology.com
> wrote:
>> On 2022-07-13 14:39, Ido Schimmel wrote:
>> > On Wed, Jul 13, 2022 at 09:09:58AM +0200, netdev@kapio-technology.com
>> > wrote:
>>
>> >
>> > What are "Storm Prevention" and "zero-DPV" FDB entries?
>>
>> They are both FDB entries that at the HW level drops all packets
>> having a
>> specific SA, thus using minimum resources.
>> (thus the name "Storm Prevention" aka, protection against DOS attacks.
>> We
>> must remember that we operate with CPU based learning.)
>
> DPV means Destination Port Vector, and an ATU entry with a DPV of 0
> essentially means a FDB entry pointing nowhere, so it will drop the
> packet. That's a slight problem with Hans' implementation, the bridge
> thinks that the locked FDB entry belongs to port X, but in reality it
> matches on all bridged ports (since it matches by FID). FID allocation
> in mv88e6xxx is slightly strange, all VLAN-unaware bridge ports,
> belonging to any bridge, share the same FID, so the FDB databases are
> not exactly isolated from each other.
But if the locked port is vlan aware and has a pvid, it should not block
other ports. Besides the fid will be zero with vlan unaware afaik, and
all with zero fid do not create locked entries.
WARNING: multiple messages have this Message-ID (diff)
From: netdev@kapio-technology.com
To: Vladimir Oltean <olteanv@gmail.com>
Cc: Ivan Vecera <ivecera@redhat.com>, Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
Jiri Pirko <jiri@resnulli.us>,
Daniel Borkmann <daniel@iogearbox.net>,
bridge@lists.linux-foundation.org,
Ido Schimmel <idosch@nvidia.com>,
Nikolay Aleksandrov <razor@blackwall.org>,
Roopa Prabhu <roopa@nvidia.com>,
linux-kernel@vger.kernel.org,
Vivien Didelot <vivien.didelot@gmail.com>,
Eric Dumazet <edumazet@google.com>,
linux-kselftest@vger.kernel.org, netdev@vger.kernel.org,
kuba@kernel.org, Paolo Abeni <pabeni@redhat.com>,
Shuah Khan <shuah@kernel.org>,
davem@davemloft.net
Subject: Re: [Bridge] [PATCH v4 net-next 3/6] drivers: net: dsa: add locked fdb entry flag to drivers
Date: Sun, 17 Jul 2022 15:09:10 +0200 [thread overview]
Message-ID: <a6ec816279b282a4ea72252a7400d5b3@kapio-technology.com> (raw)
In-Reply-To: <20220717125718.mj7b3j3jmltu6gm5@skbuf>
On 2022-07-17 14:57, Vladimir Oltean wrote:
> On Sun, Jul 17, 2022 at 02:21:47PM +0200, netdev@kapio-technology.com
> wrote:
>> On 2022-07-13 14:39, Ido Schimmel wrote:
>> > On Wed, Jul 13, 2022 at 09:09:58AM +0200, netdev@kapio-technology.com
>> > wrote:
>>
>> >
>> > What are "Storm Prevention" and "zero-DPV" FDB entries?
>>
>> They are both FDB entries that at the HW level drops all packets
>> having a
>> specific SA, thus using minimum resources.
>> (thus the name "Storm Prevention" aka, protection against DOS attacks.
>> We
>> must remember that we operate with CPU based learning.)
>
> DPV means Destination Port Vector, and an ATU entry with a DPV of 0
> essentially means a FDB entry pointing nowhere, so it will drop the
> packet. That's a slight problem with Hans' implementation, the bridge
> thinks that the locked FDB entry belongs to port X, but in reality it
> matches on all bridged ports (since it matches by FID). FID allocation
> in mv88e6xxx is slightly strange, all VLAN-unaware bridge ports,
> belonging to any bridge, share the same FID, so the FDB databases are
> not exactly isolated from each other.
But if the locked port is vlan aware and has a pvid, it should not block
other ports. Besides the fid will be zero with vlan unaware afaik, and
all with zero fid do not create locked entries.
next prev parent reply other threads:[~2022-07-17 13:09 UTC|newest]
Thread overview: 137+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-07 15:29 [PATCH v4 net-next 0/6] Extend locked port feature with FDB locked flag (MAC-Auth/MAB) Hans Schultz
2022-07-07 15:29 ` [Bridge] " Hans Schultz
2022-07-07 15:29 ` [PATCH v4 net-next 1/6] net: bridge: add locked entry fdb flag to extend locked port feature Hans Schultz
2022-07-07 15:29 ` [Bridge] " Hans Schultz
2022-07-10 8:20 ` Ido Schimmel
2022-07-10 8:20 ` [Bridge] " Ido Schimmel
2022-07-07 15:29 ` [PATCH v4 net-next 2/6] net: switchdev: add support for offloading of fdb locked flag Hans Schultz
2022-07-07 15:29 ` [Bridge] " Hans Schultz
2022-07-08 8:54 ` Vladimir Oltean
2022-07-08 8:54 ` [Bridge] " Vladimir Oltean
2022-08-02 8:27 ` netdev
2022-08-02 8:27 ` [Bridge] " netdev
2022-08-02 10:13 ` netdev
2022-08-02 10:13 ` [Bridge] " netdev
2022-07-07 15:29 ` [PATCH v4 net-next 3/6] drivers: net: dsa: add locked fdb entry flag to drivers Hans Schultz
2022-07-07 15:29 ` [Bridge] " Hans Schultz
2022-07-08 7:12 ` kernel test robot
2022-07-08 8:49 ` Vladimir Oltean
2022-07-08 8:49 ` [Bridge] " Vladimir Oltean
2022-07-08 9:06 ` netdev
2022-07-08 9:06 ` [Bridge] " netdev
2022-07-08 9:15 ` Vladimir Oltean
2022-07-08 9:15 ` [Bridge] " Vladimir Oltean
2022-07-08 9:27 ` netdev
2022-07-08 9:27 ` [Bridge] " netdev
2022-07-08 9:50 ` netdev
2022-07-08 9:50 ` [Bridge] " netdev
2022-07-08 11:56 ` Vladimir Oltean
2022-07-08 11:56 ` [Bridge] " Vladimir Oltean
2022-07-08 12:34 ` netdev
2022-07-08 12:34 ` [Bridge] " netdev
2022-07-10 8:35 ` Ido Schimmel
2022-07-10 8:35 ` [Bridge] " Ido Schimmel
2022-07-13 7:09 ` netdev
2022-07-13 7:09 ` [Bridge] " netdev
2022-07-13 12:39 ` Ido Schimmel
2022-07-13 12:39 ` [Bridge] " Ido Schimmel
2022-07-17 12:21 ` netdev
2022-07-17 12:21 ` [Bridge] " netdev
2022-07-17 12:57 ` Vladimir Oltean
2022-07-17 12:57 ` [Bridge] " Vladimir Oltean
2022-07-17 13:09 ` netdev [this message]
2022-07-17 13:09 ` netdev
2022-07-17 13:59 ` Vladimir Oltean
2022-07-17 13:59 ` [Bridge] " Vladimir Oltean
2022-07-17 14:57 ` netdev
2022-07-17 14:57 ` [Bridge] " netdev
2022-07-17 15:08 ` Vladimir Oltean
2022-07-17 15:08 ` [Bridge] " Vladimir Oltean
2022-07-17 16:10 ` netdev
2022-07-17 16:10 ` [Bridge] " netdev
2022-07-21 11:54 ` Vladimir Oltean
2022-07-21 11:54 ` [Bridge] " Vladimir Oltean
2022-07-17 15:20 ` Ido Schimmel
2022-07-17 15:20 ` [Bridge] " Ido Schimmel
2022-07-17 15:53 ` netdev
2022-07-17 15:53 ` [Bridge] " netdev
2022-07-21 11:59 ` Vladimir Oltean
2022-07-21 11:59 ` [Bridge] " Vladimir Oltean
2022-07-21 13:27 ` Ido Schimmel
2022-07-21 13:27 ` [Bridge] " Ido Schimmel
2022-07-21 14:20 ` Vladimir Oltean
2022-07-21 14:20 ` [Bridge] " Vladimir Oltean
2022-07-24 11:10 ` Ido Schimmel
2022-07-24 11:10 ` [Bridge] " Ido Schimmel
2022-08-01 11:57 ` netdev
2022-08-01 11:57 ` [Bridge] " netdev
2022-08-01 13:14 ` netdev
2022-08-01 13:14 ` [Bridge] " netdev
2022-08-02 12:54 ` netdev
2022-08-02 12:54 ` [Bridge] " netdev
2022-08-01 15:33 ` netdev
2022-08-01 15:33 ` [Bridge] " netdev
2022-08-09 9:20 ` Ido Schimmel
2022-08-09 9:20 ` [Bridge] " Ido Schimmel
2022-08-09 20:00 ` netdev
2022-08-09 20:00 ` [Bridge] " netdev
2022-08-10 7:21 ` Ido Schimmel
2022-08-10 7:21 ` [Bridge] " Ido Schimmel
2022-08-10 8:40 ` netdev
2022-08-10 8:40 ` [Bridge] " netdev
2022-08-11 11:28 ` Ido Schimmel
2022-08-11 11:28 ` [Bridge] " Ido Schimmel
2022-08-12 15:33 ` netdev
2022-08-12 15:33 ` [Bridge] " netdev
2022-08-16 7:51 ` netdev
2022-08-16 7:51 ` [Bridge] " netdev
2022-08-17 6:21 ` Ido Schimmel
2022-08-17 6:21 ` [Bridge] " Ido Schimmel
2022-07-21 11:51 ` Vladimir Oltean
2022-07-21 11:51 ` [Bridge] " Vladimir Oltean
2022-07-08 20:39 ` kernel test robot
2022-07-07 15:29 ` [PATCH v4 net-next 4/6] net: dsa: mv88e6xxx: allow reading FID when handling ATU violations Hans Schultz
2022-07-07 15:29 ` [Bridge] " Hans Schultz
2022-07-07 15:29 ` [PATCH v4 net-next 5/6] net: dsa: mv88e6xxx: mac-auth/MAB implementation Hans Schultz
2022-07-07 15:29 ` [Bridge] " Hans Schultz
2022-07-08 9:46 ` kernel test robot
2022-07-17 0:47 ` Vladimir Oltean
2022-07-17 0:47 ` [Bridge] " Vladimir Oltean
2022-07-17 12:34 ` netdev
2022-07-17 12:34 ` [Bridge] " netdev
2022-07-21 12:04 ` Vladimir Oltean
2022-07-21 12:04 ` [Bridge] " Vladimir Oltean
2022-08-19 8:28 ` netdev
2022-08-19 8:28 ` [Bridge] " netdev
2022-07-07 15:29 ` [PATCH v4 net-next 6/6] selftests: forwarding: add test of MAC-Auth Bypass to locked port tests Hans Schultz
2022-07-07 15:29 ` [Bridge] " Hans Schultz
2022-07-10 7:29 ` Ido Schimmel
2022-07-10 7:29 ` [Bridge] " Ido Schimmel
2022-07-12 12:28 ` netdev
2022-07-12 12:28 ` [Bridge] " netdev
2022-07-08 1:00 ` [PATCH v4 net-next 0/6] Extend locked port feature with FDB locked flag (MAC-Auth/MAB) Jakub Kicinski
2022-07-08 1:00 ` [Bridge] " Jakub Kicinski
2022-08-11 5:09 ` Benjamin Poirier
2022-08-11 5:09 ` [Bridge] " Benjamin Poirier
-- strict thread matches above, loose matches on Subject: below --
2022-08-12 12:29 [PATCH v4 net-next 3/6] drivers: net: dsa: add locked fdb entry flag to drivers netdev
2022-08-14 14:55 ` Ido Schimmel
2022-08-19 9:51 ` netdev
2022-08-21 7:08 ` Ido Schimmel
2022-08-21 13:43 ` netdev
2022-08-22 5:40 ` Ido Schimmel
2022-08-22 7:49 ` netdev
2022-08-23 6:48 ` Ido Schimmel
2022-08-23 7:13 ` netdev
2022-08-23 7:24 ` Ido Schimmel
2022-08-23 7:37 ` netdev
2022-08-23 12:36 ` Ido Schimmel
2022-08-24 7:07 ` netdev
2022-08-23 11:41 ` netdev
2022-08-25 9:36 ` Ido Schimmel
2022-08-25 10:28 ` netdev
2022-08-25 15:14 ` netdev
2022-08-24 20:29 ` netdev
2022-08-25 9:23 ` Ido Schimmel
2022-08-25 10:27 ` netdev
2022-08-25 11:58 ` Ido Schimmel
2022-08-25 13:41 ` netdev
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