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From: Gal Pressman <galpress@amazon.com>
To: RDMA mailing list <linux-rdma@vger.kernel.org>
Subject: ibv_req_notify_cq clarification
Date: Thu, 18 Feb 2021 11:13:43 +0200	[thread overview]
Message-ID: <bd5deec5-8fc6-ccd6-927a-898f6d9ab35b@amazon.com> (raw)

I'm a bit confused about the meaning of the ibv_req_notify_cq() verb:
"Upon the addition of a new CQ entry (CQE) to cq, a completion event will be
added to the completion channel associated with the CQ."

What is considered a new CQE in this case?
The next CQE from the user's perspective, i.e. any new CQE that wasn't consumed
by the user's poll cq?
Or any new CQE from the device's perspective?

For example, if at the time of ibv_req_notify_cq() call the CQ has received 100
completions, but the user hasn't polled his CQ yet, when should he be notified?
On the 101 completion or immediately (since there are completions waiting on the
CQ)?

Thanks!

             reply	other threads:[~2021-02-18 10:22 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-18  9:13 Gal Pressman [this message]
2021-02-18 12:38 ` ibv_req_notify_cq clarification Bernard Metzler
2021-02-18 12:47   ` Gal Pressman
2021-02-18 13:59   ` Bernard Metzler
2021-02-18 12:53 ` Jason Gunthorpe
2021-02-18 15:52   ` Gal Pressman
2021-02-18 16:23     ` Jason Gunthorpe
2021-02-18 22:22       ` Tom Talpey
2021-02-18 22:51         ` Jason Gunthorpe
2021-02-18 23:07           ` Tom Talpey
2021-02-19  0:45             ` Jason Gunthorpe
2021-02-19 14:31               ` Tom Talpey
2021-02-19 14:42                 ` Jason Gunthorpe
2021-02-21  9:25       ` Gal Pressman
2021-02-22 13:46         ` Jason Gunthorpe
2021-02-22 15:36           ` Gal Pressman
2021-02-22 15:55             ` Jason Gunthorpe
2021-02-22 19:24               ` Gal Pressman
2021-02-22 19:37                 ` Jason Gunthorpe
2021-02-23 12:18                   ` Gal Pressman
2021-02-23 12:38                     ` Jason Gunthorpe
2021-02-22 22:41                 ` Hefty, Sean
2021-02-23 12:23                   ` Gal Pressman
2021-02-23 20:48                     ` Hefty, Sean
2021-02-22 18:38             ` Hefty, Sean
2021-02-22 19:26               ` Gal Pressman
2021-02-18 18:47     ` Bernard Metzler

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