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Thu, 28 Jan 2021 13:32:53 +0000 Date: Thu, 28 Jan 2021 09:32:51 -0400 From: Jason Gunthorpe To: Tatyana Nikolova CC: , , Subject: Re: [PATCH rdma-core 3/5] rdma-core/irdma: Add user/kernel shared libraries Message-ID: <20210128133251.GB4247@nvidia.com> References: <20210128035704.1781-1-tatyana.e.nikolova@intel.com> <20210128035704.1781-4-tatyana.e.nikolova@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20210128035704.1781-4-tatyana.e.nikolova@intel.com> X-ClientProxiedBy: BL1PR13CA0237.namprd13.prod.outlook.com (2603:10b6:208:2bf::32) To DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mlx.ziepe.ca (142.162.115.133) by BL1PR13CA0237.namprd13.prod.outlook.com (2603:10b6:208:2bf::32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3825.8 via Frontend Transport; Thu, 28 Jan 2021 13:32:52 +0000 Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1l57Pn-00033a-L4; Thu, 28 Jan 2021 09:32:51 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1611840796; bh=+783QMWjJ3UL5D10+jBoSBz2uh+4RycZ8lgcFXVvdEc=; h=ARC-Seal:ARC-Message-Signature:ARC-Authentication-Results:Date: From:To:CC:Subject:Message-ID:References:Content-Type: Content-Disposition:In-Reply-To:X-ClientProxiedBy:MIME-Version: X-MS-Exchange-MessageSentRepresentingType; b=nkYpEwmXGbMSZYtrtVA+78rTz9voPLTbb+491ALuZRR09AoLuwAgRclKPNaFQDlZe 64H7wIUszUaXQNx84qrT3Yuh2N3DJ8uXSPoJitaxLBOUdWwMBuo5WOPXpr7eVzMfcm p+JIpP24cRXqXOxNGpmqAjkTohwM+LtyjYreyO0vU9lqqlAr4VyfLUSrb+6bbfG4K+ fcIDb85EvvJmhcfjHj8zTktUIEwnqLqaqZE9Ezy+9RIvOjaX1BmpCjXLbFQKQKkMGs E1SyC4knHInuVRjL2dXt+0E6dOrDR2kAkfOLIX/CEHoHFDO2RUmPOPPpUk8ULQRhiZ 55H4gIgJ4TDQQ== Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Wed, Jan 27, 2021 at 09:57:02PM -0600, Tatyana Nikolova wrote: > +/** > + * irdma_qp_post_wr - ring doorbell > + * @qp: hw qp ptr > + */ > +void irdma_qp_post_wr(struct irdma_qp_uk *qp) > +{ > + __u64 temp; > + __u32 hw_sq_tail; > + __u32 sw_sq_head; > + > + /* valid bit is written and loads completed before reading shadow */ > + atomic_thread_fence(memory_order_seq_cst); atomics are only used for synchronization with CPU threads, if this is synchronizing DMA it needs to be one of the udma operations Jason