netdev - RE: [Patch v8 12/12] RDMA/mana_ib: Add a driver for Microsoft Azure Network Adapter

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <PH7PR21MB3263A40A380B9D7F00F02529CE2D9@PH7PR21MB3263.namprd21.prod.outlook.com>
Date:   Fri, 21 Oct 2022 22:55:53 +0000
From:   Long Li <longli@...rosoft.com>
To:     Bernard Metzler <BMT@...ich.ibm.com>, tom <tom@...pey.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "shiraz.saleem@...el.com" <shiraz.saleem@...el.com>,
        Ajay Sharma <sharmaajay@...rosoft.com>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: RE: [Patch v8 12/12] RDMA/mana_ib: Add a driver for Microsoft Azure
 Network Adapter

> > The upper 8 bits of an ib_mr remote token are reserved for use as a
> > rotating key, this allows a consumer to more safely reuse an ib_mr
> > without having to overallocate large region pools.
> >
> > Tom.
> 
> Right, my point was that one cannot encode INT_MAX different MR
> identifiers into 32 - 8 = 24 bits.
> 
> Best,
> Bernard.

The hardware exposes the number of MRs that exceeds UINT32_MAX.
There is no software stack limit from hardware perspective.

In this case, maybe it's a good idea to set it to 0xFFFFFF. I'm making the change.

Thanks,
Long