From a32327a3a02c6513feaeb122a6d8fb6e8d168365 Mon Sep 17 00:00:00 2001 From: Roi Dayan Date: Mon, 28 Nov 2022 13:33:03 +0200 Subject: net/mlx5: Lag, Control MultiPort E-Switch single FDB mode MultiPort E-Switch builds on newer hardware's capabilities and introduces a mode where a single E-Switch is used and all the vports and physical ports on the NIC are connected to it. The new mode will allow in the future a decrease in the memory used by the driver and advanced features that aren't possible today. This represents a big change in the current E-Switch implantation in mlx5. Currently, by default, each E-Switch manager manages its E-Switch. Steering rules in each E-Switch can only forward traffic to the native physical port associated with that E-Switch. While there are ways to target non-native physical ports, for example using a bond or via special TC rules. None of the ways allows a user to configure the driver to operate by default in such a mode nor can the driver decide to move to this mode by default as it's user configuration-driven right now. While MultiPort E-Switch single FDB mode is the preferred mode, older generations of ConnectX hardware couldn't support this mode so it was never implemented. Now that there is capable hardware present, start the transition to having this mode by default. Introduce a devlink parameter to control MultiPort E-Switch single FDB mode. This will allow users to select this mode on their system right now and in the future will allow the driver to move to this mode by default. Example: $ devlink dev param set pci/0000:00:0b.0 name esw_multiport value 1 \ cmode runtime Signed-off-by: Roi Dayan Reviewed-by: Maor Dickman Signed-off-by: Saeed Mahameed --- Documentation/networking/devlink/mlx5.rst | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'Documentation/networking/devlink') diff --git a/Documentation/networking/devlink/mlx5.rst b/Documentation/networking/devlink/mlx5.rst index 29ad304e6fba..3321117cf605 100644 --- a/Documentation/networking/devlink/mlx5.rst +++ b/Documentation/networking/devlink/mlx5.rst @@ -54,6 +54,24 @@ parameters. - Control the number of large groups (size > 1) in the FDB table. * The default value is 15, and the range is between 1 and 1024. + * - ``esw_multiport`` + - Boolean + - runtime + - Control MultiPort E-Switch shared fdb mode. + + An experimental mode where a single E-Switch is used and all the vports + and physical ports on the NIC are connected to it. + + An example is to send traffic from a VF that is created on PF0 to an + uplink that is natively associated with the uplink of PF1 + + Note: Future devices, ConnectX-8 and onward, will eventually have this + as the default to allow forwarding between all NIC ports in a single + E-switch environment and the dual E-switch mode will likely get + deprecated. + + Default: disabled + The ``mlx5`` driver supports reloading via ``DEVLINK_CMD_RELOAD`` -- cgit v1.2.3