netdev - Re: [net-next 07/15] net/mlx5: mlx5

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Date:   Wed, 21 Apr 2021 20:52:00 +0300
From:   Yevgeny Kliteynik <kliteyn@...dia.com>
To:     "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        Saeed Mahameed <saeed@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, Tariq Toukan <tariqt@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [net-next 07/15] net/mlx5: mlx5_ifc updates for flex parser



On 21-Apr-21 18:08, Samudrala, Sridhar wrote:
>>>> Added the required definitions for supporting more protocols by flex
>>>> parsers
>>>> (GTP-U, Geneve TLV options), and for using the right flex parser
>>>> that was
>>>> configured for this protocol.
>>> Are you planning to support adding flow rules to match on these protocol
>>> specific fields?
>>> If so,  are you planning to extend tc flower OR use other interfaces?
>>
>> Some of these are already supported through tc on DMFS.
>> This patch series adds support for SMFS: Geneve options and MPLS
>> both through tc and through rdma-core on root table,
>> and GTP-U is supported only through rdma-core on root table.
> 
> What is the interface for rdma-core to hook into the driver to add these
> rules?
> Is there an equivalent of ndo_setup_tc()  that is used with tc interface?

This is done through RDMA verbs.

Among other things, rdma-core provides an API for a user level 
application (such as DPDK) to control flow steering through verbs.

You can find more details here:
     https://github.com/linux-rdma/rdma-core

Flow steering API is here:
 
https://github.com/linux-rdma/rdma-core/blob/master/providers/mlx5/mlx5dv.h


>> -- YK
>>
>>>> Signed-off-by: Yevgeny Kliteynik <kliteyn@...dia.com>
>>>> Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
>>>> ---
>>>> �  include/linux/mlx5/mlx5_ifc.h | 32 ++++++++++++++++++++++++++++----
>>>> �  1 file changed, 28 insertions(+), 4 deletions(-)