From: David Ahern <dsahern@gmail.com>
To: Parav Pandit <parav@nvidia.com>,
Saeed Mahameed <saeed@kernel.org>,
Jakub Kicinski <kuba@kernel.org>,
Jason Gunthorpe <jgg@nvidia.com>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
Jiri Pirko <jiri@nvidia.com>,
"dledford@redhat.com" <dledford@redhat.com>,
Leon Romanovsky <leonro@nvidia.com>,
"davem@davemloft.net" <davem@davemloft.net>
Subject: Re: [PATCH net-next 00/13] Add mlx5 subfunction support
Date: Wed, 25 Nov 2020 07:37:58 -0700 [thread overview]
Message-ID: <9a5d1d5e-a12c-3cc1-b433-4920fb595fc3@gmail.com> (raw)
In-Reply-To: <BY5PR12MB43221CF1FAD99DF931ADE99CDCFA0@BY5PR12MB4322.namprd12.prod.outlook.com>
On 11/24/20 11:00 PM, Parav Pandit wrote:
> Hi David,
>
>> From: David Ahern <dsahern@gmail.com>
>> Sent: Wednesday, November 25, 2020 11:04 AM
>>
>> On 11/18/20 10:57 PM, Saeed Mahameed wrote:
>>>
>>> We are not slicing up any queues, from our HW and FW perspective SF ==
>>> VF literally, a full blown HW slice (Function), with isolated control
>>> and data plane of its own, this is very different from VMDq and more
>>> generic and secure. an SF device is exactly like a VF, doesn't steal
>>> or share any HW resources or control/data path with others. SF is
>>> basically SRIOV done right.
>>
>> What does that mean with respect to mac filtering and ntuple rules?
>>
>> Also, Tx is fairly easy to imagine, but how does hardware know how to direct
>> packets for the Rx path? As an example, consider 2 VMs or containers with the
>> same destination ip both using subfunction devices.
> Since both VM/containers are having same IP, it is better to place them in different L2 domains via vlan, vxlan etc.
ok, so relying on <vlan, dmac> pairs.
>
>> How does the nic know how to direct the ingress flows to the right queues for
>> the subfunction?
>>
> Rx steering occurs through tc filters via representor netdev of SF.
> Exactly same way as VF representor netdev operation.
>
> When devlink eswitch port is created as shown in example in cover letter, and also in patch-12, it creates the representor netdevice.
> Below is the snippet of it.
>
> Add a devlink port of subfunction flavour:
> $ devlink port add pci/0000:06:00.0 flavour pcisf pfnum 0 sfnum 88
>
> Configure mac address of the port function:
> $ devlink port function set ens2f0npf0sf88 hw_addr 00:00:00:00:88:88
> ^^^^^^^^^^^^^^
> This is the representor netdevice. It is created by port add command.
> This name is setup by systemd/udev v245 and higher by utilizing the existing phys_port_name infrastructure already exists for PF and VF representors.
hardware ensures only packets with that dmac are sent to the subfunction
device.
>
> Now user can add unicast rx tc rule for example,
>
> $ tc filter add dev ens2f0np0 parent ffff: prio 1 flower dst_mac 00:00:00:00:88:88 action mirred egress redirect dev ens2f0npf0sf88
>
> I didn't cover this tc example in cover letter, to keep it short.
> But I had a one line description as below in the 'detail' section of cover-letter.
> Hope it helps.
>
> - A SF supports eswitch representation and tc offload support similar
> to existing PF and VF representors.
>
> Now above portion answers, how to forward the packet to subfunction.
> But how to forward to the right rx queue out of multiple rxqueues?
> This is done by the rss configuration done by the user, number of channels from ethtool.
> Just like VF and PF.
> The driver defaults are similar to VF, which user can change via ethtool.
>
so users can add flow steering or drop rules to SF devices.
thanks,
next prev parent reply other threads:[~2020-11-25 14:38 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-12 19:24 [PATCH net-next 00/13] Add mlx5 subfunction support Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 01/13] devlink: Prepare code to fill multiple port function attributes Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 02/13] devlink: Introduce PCI SF port flavour and port attribute Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 03/13] devlink: Support add and delete devlink port Parav Pandit
2020-11-18 16:21 ` David Ahern
2020-11-18 17:02 ` Parav Pandit
2020-11-18 18:03 ` David Ahern
2020-11-18 18:38 ` Jason Gunthorpe
2020-11-18 19:36 ` David Ahern
2020-11-18 20:42 ` Jason Gunthorpe
2020-11-18 19:22 ` Parav Pandit
2020-11-19 0:41 ` Jacob Keller
2020-11-19 1:17 ` David Ahern
2020-11-19 1:56 ` Samudrala, Sridhar
2020-11-19 0:52 ` Jacob Keller
2020-11-12 19:24 ` [PATCH net-next 04/13] devlink: Support get and set state of port function Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 05/13] devlink: Avoid global devlink mutex, use per instance reload lock Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 06/13] devlink: Introduce devlink refcount to reduce scope of global devlink_mutex Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 07/13] net/mlx5: SF, Add auxiliary device support Parav Pandit
2020-12-07 2:48 ` David Ahern
2020-12-07 4:53 ` Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 08/13] net/mlx5: SF, Add auxiliary device driver Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 09/13] net/mlx5: E-switch, Prepare eswitch to handle SF vport Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 10/13] net/mlx5: E-switch, Add eswitch helpers for " Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 11/13] net/mlx5: SF, Add SF configuration hardware commands Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 12/13] net/mlx5: SF, Add port add delete functionality Parav Pandit
2020-11-12 19:24 ` [PATCH net-next 13/13] net/mlx5: SF, Port function state change support Parav Pandit
2020-11-16 22:52 ` [PATCH net-next 00/13] Add mlx5 subfunction support Jakub Kicinski
2020-11-17 0:06 ` Saeed Mahameed
2020-11-17 1:58 ` Jakub Kicinski
2020-11-17 4:08 ` Parav Pandit
2020-11-17 17:11 ` Jakub Kicinski
2020-11-17 18:49 ` Jason Gunthorpe
2020-11-19 2:14 ` Jakub Kicinski
2020-11-19 4:35 ` David Ahern
2020-11-19 5:57 ` Saeed Mahameed
2020-11-20 1:31 ` Jakub Kicinski
2020-11-25 5:33 ` David Ahern
2020-11-25 6:00 ` Parav Pandit
2020-11-25 14:37 ` David Ahern [this message]
2020-11-20 1:29 ` Jakub Kicinski
2020-11-20 17:58 ` Alexander Duyck
2020-11-20 19:04 ` Samudrala, Sridhar
2020-11-23 21:51 ` Saeed Mahameed
2020-11-24 7:01 ` Jason Wang
2020-11-24 7:05 ` Jason Wang
2020-11-19 6:12 ` Saeed Mahameed
2020-11-19 8:25 ` Parav Pandit
2020-11-20 1:35 ` Jakub Kicinski
2020-11-20 3:34 ` Parav Pandit
2020-11-17 18:50 ` Parav Pandit
2020-11-19 2:23 ` Jakub Kicinski
2020-11-19 6:22 ` Saeed Mahameed
2020-11-19 14:00 ` Jason Gunthorpe
2020-11-20 3:35 ` Jakub Kicinski
2020-11-20 3:50 ` Parav Pandit
2020-11-20 16:16 ` Jason Gunthorpe
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