netdev - Re: [PATCH mlx5-next v1 00/14] mlx5 MACsec RoCEv2 support

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Date: Wed, 9 Aug 2023 16:10:56 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Leon Romanovsky <leon@...nel.org>
Cc: Jason Gunthorpe <jgg@...dia.com>, Leon Romanovsky <leonro@...dia.com>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, linux-rdma@...r.kernel.org, Maor Gottlieb
 <maorg@...dia.com>, Mark Zhang <markzhang@...dia.com>,
 netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>, Patrisious Haddad
 <phaddad@...dia.com>, Raed Salem <raeds@...dia.com>, Saeed Mahameed
 <saeedm@...dia.com>, Simon Horman <horms@...nel.org>
Subject: Re: [PATCH mlx5-next v1 00/14] mlx5 MACsec RoCEv2 support

On Wed, 9 Aug 2023 16:09:45 -0700 Jakub Kicinski wrote:
> On Wed,  9 Aug 2023 11:29:12 +0300 Leon Romanovsky wrote:
> > This series extends previously added MACsec offload support
> > to cover RoCE traffic either.
> > 
> > In order to achieve that, we need configure MACsec with offload between
> > the two endpoints, like below:
> > 
> > REMOTE_MAC=10:70:fd:43:71:c0
> > 
> > * ip addr add 1.1.1.1/16 dev eth2
> > * ip link set dev eth2 up
> > * ip link add link eth2 macsec0 type macsec encrypt on
> > * ip macsec offload macsec0 mac
> > * ip macsec add macsec0 tx sa 0 pn 1 on key 00 dffafc8d7b9a43d5b9a3dfbbf6a30c16
> > * ip macsec add macsec0 rx port 1 address $REMOTE_MAC
> > * ip macsec add macsec0 rx port 1 address $REMOTE_MAC sa 0 pn 1 on key 01 ead3664f508eb06c40ac7104cdae4ce5
> > * ip addr add 10.1.0.1/16 dev macsec0
> > * ip link set dev macsec0 up
> > 
> > And in a similar manner on the other machine, while noting the keys order
> > would be reversed and the MAC address of the other machine.
> > 
> > RDMA traffic is separated through relevant GID entries and in case of IP ambiguity
> > issue - meaning we have a physical GIDs and a MACsec GIDs with the same IP/GID, we
> > disable our physical GID in order to force the user to only use the MACsec GID.  
> 
> Can you explain why you need special code to handle this?
> MACsec is L2, RDMA is L4.

Ah, because you need to support "offload" on device that's not yours.