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From: Kamal Heib <kamalheib1@gmail.com>
To: Zhu Yanjun <zyjzyj2000@gmail.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>, Yanjun Zhu <yanjunz@mellanox.com>,
	linux-rdma@vger.kernel.org, Doug Ledford <dledford@redhat.com>
Subject: Re: FW: [PATCH for-next] RDMA/rxe: Remove pkey table
Date: Tue, 28 Jul 2020 11:35:57 +0300
Message-ID: <20200728083557.GA73564@kheib-workstation> (raw)
In-Reply-To: <4796e70a-ca67-2d48-fdd8-e5593474d204@gmail.com>

On Thu, Jul 23, 2020 at 11:15:00PM +0800, Zhu Yanjun wrote:
> On 7/23/2020 9:15 PM, Jason Gunthorpe wrote:
> > On Thu, Jul 23, 2020 at 09:08:39PM +0800, Zhu Yanjun wrote:
> > > On 7/23/2020 3:25 PM, Kamal Heib wrote:
> > > > On Thu, Jul 23, 2020 at 02:58:41PM +0800, Zhu Yanjun wrote:
> > > > > On 7/23/2020 1:57 PM, Kamal Heib wrote:
> > > > > > On Wed, Jul 22, 2020 at 10:09:04AM +0800, Zhu Yanjun wrote:
> > > > > > > On Tue, Jul 21, 2020 at 7:28 PM Yanjun Zhu <yanjunz@mellanox.com> wrote:
> > > > > > > > From: Kamal Heib <kamalheib1@gmail.com>
> > > > > > > > Sent: Tuesday, July 21, 2020 6:16 PM
> > > > > > > > To: linux-rdma@vger.kernel.org
> > > > > > > > Cc: Yanjun Zhu <yanjunz@mellanox.com>; Doug Ledford <dledford@redhat.com>; Jason Gunthorpe <jgg@ziepe.ca>; Kamal Heib <kamalheib1@gmail.com>
> > > > > > > > Subject: [PATCH for-next] RDMA/rxe: Remove pkey table
> > > > > > > > 
> > > > > > > > The RoCE spec require from RoCE devices to support only the defualt pkey, While the rxe driver maintain a 64 enties pkey table and use only the first entry. With that said remove the maintaing of the pkey table and used the default pkey when needed.
> > > > > > > > 
> > > > > > > Hi Kamal
> > > > > > > 
> > > > > > > After this patch is applied, do you make tests with SoftRoCE and mlx hardware?
> > > > > > > 
> > > > > > > The SoftRoCE should work well with the mlx hardware.
> > > > > > > 
> > > > > > > Zhu Yanjun
> > > > > > > 
> > > > > > Hi Zhu,
> > > > > > 
> > > > > > Yes, please see below:
> > > > > > 
> > > > > > $ ibv_rc_pingpong -d mlx5_0 -g 11
> > > > > >      local address:  LID 0x0000, QPN 0x0000e3, PSN 0x728a4f, GID ::ffff:172.31.40.121
> > > > > Can you make tests with GSI QP?
> > > > > 
> > > > > Zhu Yanjun
> > > > > 
> > > Is this the GSI ?
> > > 
> > > Please check GSI in "InfiniBandTM Architecture Specification Volume 1
> > > Release 1.3"
> > > 
> > > Then make tests with GSI again.
> 
> The followings are also removed by this commit. Not sure if it is good.
> 
> "
> 
> C9-42: If the destination QP is QP1, the BTH:P_Key shall be compared to the
> set of P_Keys associated with the port on which the packet arrived. If the
> P_Key matches any of the keys associated with the port, it shall be
> considered valid.
> 
> "
>

The above is correct for ports that configured to work in InfiniBand
mode, while in RoCEv2 mode only the default P_Key should be associated
with the port (Please see below from "ANNEX A17:   ROCEV2 (IP ROUTABLE
ROCE)):

"""
17.7.1 LOADING THE P_KEY TABLE

Compliance statement C17-7: on page 1193 describes requirements for
setting the P_Key table based on an assumption that the P_Key table is
set directly by a Subnet Manager. However, RoCEv2 ports do not support
InfiniBand Subnet Management. Therefore, compliance statement C17-7:
on page 1193 does not apply to RoCEv2 ports.

Methods for setting the P_Key table associated with a RoCEv2 port are
not defined in this specification, except for the requirements for a
default P_Key described elsewhere in this annex.
"""

Thanks,
Kamal


> > rping uses RDMA CM which goes over the GSI
> > 
> > Jason
> 
> 

  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-21 10:16 Kamal Heib
     [not found] ` <AM6PR05MB6263CFB337190B1740CDF4B7D8780@AM6PR05MB6263.eurprd05.prod.outlook.com>
2020-07-22  2:09   ` FW: " Zhu Yanjun
2020-07-23  5:57     ` Kamal Heib
2020-07-23  6:58       ` Zhu Yanjun
2020-07-23  7:25         ` Kamal Heib
2020-07-23 13:08           ` Zhu Yanjun
2020-07-23 13:15             ` Jason Gunthorpe
2020-07-23 15:15               ` Zhu Yanjun
2020-07-28  8:35                 ` Kamal Heib [this message]
2020-07-28 13:21                   ` Zhu Yanjun
2020-07-28 13:44                     ` Kamal Heib
2020-07-28 15:46                       ` Zhu Yanjun
2020-07-28 17:42                         ` Kamal Heib
2020-07-28 23:45                           ` Zhu Yanjun
2020-07-29  1:36                             ` Mark Bloch
2020-07-31 19:22 ` Jason Gunthorpe

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