netdev - Re: mlx5 sub function issue

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Message-ID: <CANS1P8EHJ+ZSZT8MT43PzXH6bhZ6FVhrQ_sxxFWbWTvzyT+3rA@mail.gmail.com>
Date:   Tue, 9 Mar 2021 11:04:17 +0800
From:   ze wang <wangze712@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Parav Pandit <parav@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org
Subject: Re: mlx5 sub function issue

Hi David,
      I can see that the variable settings are in effect：
# mlxconfig -d b3:00.0 s PF_BAR2_ENABLE=0 PER_PF_NUM_SF=1 PF_SF_BAR_SIZE=8
# mlxconfig -d b3:00.0 s PER_PF_NUM_SF=1 PF_TOTAL_SF=192 PF_SF_BAR_SIZE=8
# mlxconfig -d b3:00.1 s PER_PF_NUM_SF=1 PF_TOTAL_SF=192 PF_SF_BAR_SIZE=8

after cold reboot:
# mlxconfig -d b3:00.0 q|grep BAR
PF_BAR2_ENABLE                           False(0)
# mlxconfig -d b3:00.0 q|grep SF
Description:    ConnectX-6 Dx EN adapter card; 25GbE; Dual-port SFP28;
PCIe 4.0 x8; Crypto and Secure Boot
         PER_PF_NUM_SF                   True(1)
         PF_TOTAL_SF                         192
         PF_SF_BAR_SIZE                   8
# mlxconfig -d b3:00.1 q|grep SF
Description:    ConnectX-6 Dx EN adapter card; 25GbE; Dual-port SFP28;
PCIe 4.0 x8; Crypto and Secure Boot
         PER_PF_NUM_SF                  True(1)
         PF_TOTAL_SF                        192
         PF_SF_BAR_SIZE                  8

I tried to create as many SF as possible, then I found each PF can
create up to 132 SFs. I want to confirm the maximum number of SFs that
CX6 can create. If the mft version is correct, can I think that CX6
can create up to 132 SFs per PF?

David Ahern <dsahern@...il.com> 于2021年3月8日周一 下午11:48写道：
>
> On 3/8/21 12:21 AM, ze wang wrote:
> > mlxconfig tool from mft tools version 4.16.52 or higher to set number of SF.
> >
> > mlxconfig -d b3:00.0  PF_BAR2_ENABLE=0 PER_PF_NUM_SF=1 PF_SF_BAR_SIZE=8
> > mlxconfig -d b3:00.0  PER_PF_NUM_SF=1 PF_TOTAL_SF=192 PF_SF_BAR_SIZE=8
> > mlxconfig -d b3:00.1  PER_PF_NUM_SF=1 PF_TOTAL_SF=192 PF_SF_BAR_SIZE=8
> >
> > Cold reboot power cycle of the system as this changes the BAR size in device
> >
>
> Is that capability going to be added to devlink?