From: Jason Gunthorpe <jgg-uk2M96/98Pc@public.gmane.org>
To: "Liuyixian (Eason)" <liuyixian-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH rdma-core 2/2] libhns: Support cq record doorbell
Date: Fri, 19 Jan 2018 13:00:29 -0700 [thread overview]
Message-ID: <20180119200029.GD3437@ziepe.ca> (raw)
In-Reply-To: <a33a1337-665f-4cd4-5b39-b12d9f03af72-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
On Fri, Jan 19, 2018 at 07:04:42PM +0800, Liuyixian (Eason) wrote:
> For case 1, the new kernel driver can't support old user application or old userspace driver.
> Because we use the record db solution (what this patchset does and why add new db_addr in kernel)
> to substitute with operating register, which used by the old userspace driver.
> Therefore, users need to update the userspace driver to the version which support record db.
This is not acceptable for the kernel. You must maintain compatability
with old userspace.
Also, new userspace must work with older kernels.
Jason
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next prev parent reply other threads:[~2018-01-19 20:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-18 2:35 [PATCH rdma-core 0/2] Support rq and cq record doorbell Yixian Liu
[not found] ` <1516242961-154453-1-git-send-email-liuyixian-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-01-18 2:36 ` [PATCH rdma-core 1/2] libhns: Support rq " Yixian Liu
2018-01-18 2:36 ` [PATCH rdma-core 2/2] libhns: Support cq " Yixian Liu
[not found] ` <1516242961-154453-3-git-send-email-liuyixian-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-01-18 4:37 ` Jason Gunthorpe
[not found] ` <20180118043717.GC8414-uk2M96/98Pc@public.gmane.org>
2018-01-18 7:25 ` Liuyixian (Eason)
[not found] ` <9e577314-4fcb-45de-6909-d5b3be570196-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-01-18 16:19 ` Jason Gunthorpe
[not found] ` <20180118161949.GA18973-uk2M96/98Pc@public.gmane.org>
2018-01-19 11:04 ` Liuyixian (Eason)
[not found] ` <a33a1337-665f-4cd4-5b39-b12d9f03af72-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-01-19 20:00 ` Jason Gunthorpe [this message]
[not found] ` <20180119200029.GD3437-uk2M96/98Pc@public.gmane.org>
2018-01-20 11:41 ` Liuyixian (Eason)
[not found] ` <68e02f2a-0474-bc73-a784-fd52dbbde552-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-01-20 16:46 ` Jason Gunthorpe
[not found] ` <20180120164625.GA14372-uk2M96/98Pc@public.gmane.org>
2018-01-23 12:51 ` Liuyixian (Eason)
[not found] ` <124fa0b2-ac35-a103-205b-252fddea2665-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-01-23 15:04 ` Jason Gunthorpe
[not found] ` <20180123150421.GA30670-uk2M96/98Pc@public.gmane.org>
2018-01-24 10:35 ` Liuyixian (Eason)
[not found] ` <91b5f324-cfaf-e778-2d6c-46000267f2cb-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-01-24 11:51 ` Leon Romanovsky
[not found] ` <20180124115141.GG1393-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2018-01-24 16:30 ` Jason Gunthorpe
[not found] ` <20180124163056.GC16845-uk2M96/98Pc@public.gmane.org>
2018-01-25 13:16 ` Liuyixian (Eason)
2018-01-21 6:57 ` Leon Romanovsky
[not found] ` <20180121065727.GF1393-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2018-01-22 14:01 ` Liuyixian (Eason)
[not found] ` <1d95b4da-1cb8-e1ef-9c0e-4ac70a848d38-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-01-22 15:13 ` Leon Romanovsky
[not found] ` <20180122151307.GK1393-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2018-01-23 12:38 ` Liuyixian (Eason)
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