linux-kernel - Re: [PATCH IB/core 2/2] IB/cm: Send authentic pkey in REQ msg and check eligibility of the pkeys

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Message-Id: <FDEBA43A-C98F-4E2B-A8F3-CA809FBAD479@oracle.com>
Date:   Wed, 16 May 2018 20:14:50 +0200
From:   Håkon Bugge <haakon.bugge@...cle.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Doug Ledford <dledford@...hat.com>,
        Don Hiatt <don.hiatt@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Sean Hefty <sean.hefty@...el.com>,
        OFED mailing list <linux-rdma@...r.kernel.org>,
        linux-kernel@...r.kernel.org,
        Hal Rosenstock <hal@....mellanox.co.il>
Subject: Re: [PATCH IB/core 2/2] IB/cm: Send authentic pkey in REQ msg and
 check eligibility of the pkeys



> On 16 May 2018, at 20:01, Jason Gunthorpe <jgg@...pe.ca> wrote:
> 
> On Wed, May 16, 2018 at 07:46:10PM +0200, Håkon Bugge wrote:
> 
>>   OK. Lets take one example. The pkey table contains 0xFFFF, 0x8001,
>>   0x0001.
>> 
>>   The wce.pkey_index is 1 (i.e., pointing to 0x8001). Now, tell me, was
>>   BTH.PKey 0x8001 (matches 0x8001) or was it 0x0001 (also matching
>>   0x8001) ?
> 
> As far as the Linux core is concerned, it must have been 0x8001,
> because the only way the pkey_index feature works properly is if
> exact-match takes precedence over in-exact match.

And now if the table only contains 0xFFFF, 0x8001, how do you tell?


Håkon