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From: Jason Gunthorpe <jgg@nvidia.com>
To: "Nikolova, Tatyana E" <tatyana.e.nikolova@intel.com>
Cc: "dledford@redhat.com" <dledford@redhat.com>,
	"leon@kernel.org" <leon@kernel.org>,
	"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>
Subject: Re: [PATCH rdma-core] irdma: Restore full memory barrier for doorbell optimization
Date: Tue, 10 Aug 2021 08:59:33 -0300	[thread overview]
Message-ID: <20210810115933.GB5158@nvidia.com> (raw)
In-Reply-To: <DM6PR11MB4692155E49A76F8789881338CBF69@DM6PR11MB4692.namprd11.prod.outlook.com>

On Mon, Aug 09, 2021 at 08:07:32PM +0000, Nikolova, Tatyana E wrote:
> 1.	Software writing the valid bit in the WQE.
> 2.	Software reading shadow memory (hw_tail) value.

You are missing an ordered atomic on this read it looks like

Jason

  reply	other threads:[~2021-08-10 11:59 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-05 16:11 [PATCH rdma-core] irdma: Restore full memory barrier for doorbell optimization Tatyana Nikolova
2021-08-06  1:28 ` Jason Gunthorpe
2021-08-09 20:07   ` Nikolova, Tatyana E
2021-08-10 11:59     ` Jason Gunthorpe [this message]
2021-08-13 22:25       ` Tatyana Nikolova
2021-08-18 16:49         ` Jason Gunthorpe
2021-08-19 22:01           ` Nikolova, Tatyana E
2021-08-19 22:44             ` Jason Gunthorpe
2021-09-02 16:27               ` Nikolova, Tatyana E
2021-09-02 17:09                 ` Jason Gunthorpe

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