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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
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