From: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> To: Sagi Grimberg <sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>, Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org> Cc: dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, infinipath-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org, ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org, roid-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, eli-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org, target-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org Subject: Re: [PATCH V6 6/9] isert: Rename IO functions to more descriptive names Date: Sun, 26 Jul 2015 15:15:34 -0500 [thread overview] Message-ID: <55B53FE6.1030509@opengridcomputing.com> (raw) In-Reply-To: <55B51B7A.8030008-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org> On 7/26/2015 12:40 PM, Sagi Grimberg wrote: > >>> Ideally, the post contains a chain of all 4 registrations and the >>> rdma_read (and an opportunistic good scsi response). >> >> Just to be clear: This example is for IB only, correct? IW would >> require rkeys with REMOTE_WRITE and 4 read wrs. > > My assumption is that it would depend on max_sge_rd. > yea. > IB only? iWARP by definition isn't capable of doing rdma_read to > more than one scatter? Anyway, we'll need to calculate the number > of RDMA_READs. > The wire protocol limits the destination to a single stg/to/len (aka rkey/addr/len). Devices/fw/sw could implement some magic to support a single stg/to/len that maps to a scatter gather list of stags/tos/lens. >> And you're ignoring invalidation wrs (or read-with-inv) in the >> example... > > Yes, didn't want to inflate the example too much... -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: Steve Wise <swise@opengridcomputing.com> To: Sagi Grimberg <sagig@dev.mellanox.co.il>, Christoph Hellwig <hch@infradead.org> Cc: dledford@redhat.com, infinipath@intel.com, sagig@mellanox.com, ogerlitz@mellanox.com, roid@mellanox.com, linux-rdma@vger.kernel.org, eli@mellanox.com, target-devel@vger.kernel.org, linux-nfs@vger.kernel.org, bfields@fieldses.org Subject: Re: [PATCH V6 6/9] isert: Rename IO functions to more descriptive names Date: Sun, 26 Jul 2015 15:15:34 -0500 [thread overview] Message-ID: <55B53FE6.1030509@opengridcomputing.com> (raw) In-Reply-To: <55B51B7A.8030008@dev.mellanox.co.il> On 7/26/2015 12:40 PM, Sagi Grimberg wrote: > >>> Ideally, the post contains a chain of all 4 registrations and the >>> rdma_read (and an opportunistic good scsi response). >> >> Just to be clear: This example is for IB only, correct? IW would >> require rkeys with REMOTE_WRITE and 4 read wrs. > > My assumption is that it would depend on max_sge_rd. > yea. > IB only? iWARP by definition isn't capable of doing rdma_read to > more than one scatter? Anyway, we'll need to calculate the number > of RDMA_READs. > The wire protocol limits the destination to a single stg/to/len (aka rkey/addr/len). Devices/fw/sw could implement some magic to support a single stg/to/len that maps to a scatter gather list of stags/tos/lens. >> And you're ignoring invalidation wrs (or read-with-inv) in the >> example... > > Yes, didn't want to inflate the example too much...
next prev parent reply other threads:[~2015-07-26 20:15 UTC|newest] Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-07-24 16:18 [PATCH V6 0/9] iSER support for iWARP Steve Wise 2015-07-24 16:18 ` Steve Wise [not found] ` <20150724161331.25617.8475.stgit-PBeJgSbIpn97NCTnQtmixQ@public.gmane.org> 2015-07-24 16:18 ` [PATCH V6 1/9] RDMA/iser: Limit sg tablesize and max_sectors to device fastreg max depth Steve Wise 2015-07-24 16:18 ` Steve Wise [not found] ` <20150724161820.25617.63886.stgit-PBeJgSbIpn97NCTnQtmixQ@public.gmane.org> 2015-07-24 16:41 ` Jason Gunthorpe 2015-07-24 16:41 ` Jason Gunthorpe 2015-07-24 18:40 ` Steve Wise 2015-07-24 18:40 ` Steve Wise 2015-07-24 19:14 ` Jason Gunthorpe 2015-07-26 9:58 ` Sagi Grimberg 2015-07-26 9:57 ` Sagi Grimberg 2015-07-26 9:57 ` Sagi Grimberg 2015-07-24 16:18 ` [PATCH V6 2/9] mlx4, mlx5, mthca: Expose max_sge_rd correctly Steve Wise 2015-07-24 16:18 ` Steve Wise 2015-07-24 16:18 ` [PATCH V6 3/9] ipath,qib: " Steve Wise 2015-07-24 16:18 ` Steve Wise 2015-07-24 16:18 ` [PATCH V6 4/9] svcrdma: Use max_sge_rd for destination read depths Steve Wise 2015-07-24 16:18 ` Steve Wise [not found] ` <20150724161837.25617.48584.stgit-PBeJgSbIpn97NCTnQtmixQ@public.gmane.org> 2015-07-24 18:51 ` Steve Wise 2015-07-24 18:51 ` Steve Wise 2015-07-26 9:58 ` Sagi Grimberg [not found] ` <55B4AF63.3040108-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org> 2015-07-26 10:42 ` Christoph Hellwig 2015-07-26 10:42 ` Christoph Hellwig 2015-07-24 16:18 ` [PATCH V6 6/9] isert: Rename IO functions to more descriptive names Steve Wise 2015-07-24 16:18 ` Steve Wise [not found] ` <20150724161848.25617.26092.stgit-PBeJgSbIpn97NCTnQtmixQ@public.gmane.org> 2015-07-26 10:08 ` Sagi Grimberg 2015-07-26 10:08 ` Sagi Grimberg [not found] ` <55B4B190.7070305-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org> 2015-07-26 10:43 ` Christoph Hellwig 2015-07-26 10:43 ` Christoph Hellwig [not found] ` <20150726104328.GB18944-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org> 2015-07-26 11:00 ` Sagi Grimberg 2015-07-26 11:00 ` Sagi Grimberg 2015-07-26 15:53 ` Christoph Hellwig 2015-07-26 16:44 ` Sagi Grimberg [not found] ` <55B4BDE3.8040801-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org> 2015-07-26 17:32 ` Steve Wise 2015-07-26 17:32 ` Steve Wise 2015-07-26 17:40 ` Sagi Grimberg [not found] ` <55B51B7A.8030008-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org> 2015-07-26 20:15 ` Steve Wise [this message] 2015-07-26 20:15 ` Steve Wise 2015-07-26 20:17 ` Steve Wise 2015-07-26 20:17 ` Steve Wise [not found] ` <55B5404F.5040404-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> 2015-07-27 21:45 ` Steve Wise 2015-07-27 21:45 ` Steve Wise 2015-08-03 19:32 ` Steve Wise 2015-08-03 19:32 ` Steve Wise 2015-08-04 17:26 ` Sagi Grimberg [not found] ` <55C0F5B7.4040100-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org> 2015-08-04 17:44 ` Steve Wise 2015-08-04 17:44 ` Steve Wise 2015-08-05 21:23 ` Steve Wise 2015-08-05 21:23 ` Steve Wise 2015-08-06 15:37 ` Sagi Grimberg 2015-08-06 15:37 ` Sagi Grimberg [not found] ` <55C37F43.6080106-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org> 2015-08-12 22:15 ` Steve Wise 2015-08-12 22:15 ` Steve Wise 2015-08-13 13:09 ` Sagi Grimberg 2015-07-24 16:18 ` [PATCH V6 5/9] RDMA/isert: Limit read depth based on the device max_sge_rd capability Steve Wise 2015-07-24 16:18 ` [PATCH V6 7/9] isert: Use the device's max fastreg page list depth Steve Wise 2015-07-24 16:18 ` [PATCH V6 8/9] isert: Use local_dma_lkey whenever possible Steve Wise [not found] ` <20150724161859.25617.17286.stgit-PBeJgSbIpn97NCTnQtmixQ@public.gmane.org> 2015-07-24 16:49 ` Jason Gunthorpe 2015-07-24 16:49 ` Jason Gunthorpe [not found] ` <20150724164909.GB25480-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> 2015-07-24 18:41 ` Steve Wise 2015-07-24 18:41 ` Steve Wise 2015-07-24 16:19 ` [PATCH V6 9/9] isert: Support iWARP transports using FRMRs Steve Wise 2015-07-24 16:57 ` Jason Gunthorpe 2015-07-24 18:48 ` Steve Wise 2015-07-24 18:48 ` Steve Wise 2015-07-24 19:24 ` Jason Gunthorpe 2015-07-24 19:24 ` Jason Gunthorpe 2015-07-24 19:57 ` Steve Wise 2015-07-24 19:57 ` Steve Wise 2015-07-24 22:11 ` Steve Wise 2015-07-24 22:11 ` Steve Wise 2015-07-24 22:38 ` Jason Gunthorpe 2015-07-24 22:38 ` Jason Gunthorpe [not found] ` <20150724192411.GC26225-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> 2015-07-26 10:23 ` Sagi Grimberg 2015-07-26 10:23 ` Sagi Grimberg 2015-07-27 17:07 ` Jason Gunthorpe
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