From: Jason Gunthorpe <jgg@nvidia.com>
To: Tatyana Nikolova <tatyana.e.nikolova@intel.com>
Cc: <dledford@redhat.com>, <leon@kernel.org>, <linux-rdma@vger.kernel.org>
Subject: Re: [PATCH rdma-core 3/5] rdma-core/irdma: Add user/kernel shared libraries
Date: Thu, 28 Jan 2021 09:32:51 -0400 [thread overview]
Message-ID: <20210128133251.GB4247@nvidia.com> (raw)
In-Reply-To: <20210128035704.1781-4-tatyana.e.nikolova@intel.com>
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
next prev parent reply other threads:[~2021-01-28 13:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-28 3:56 [PATCH rdma-core 0/5] Add irdma user space provider for Intel Ethernet RDMA Tatyana Nikolova
2021-01-28 3:57 ` [PATCH rdma-core 1/5] rdma-core/i40iw: Remove provider i40iw Tatyana Nikolova
2021-01-28 13:31 ` Jason Gunthorpe
2021-01-28 3:57 ` [PATCH rdma-core 2/5] rdma-core/irdma: Add Makefile and ABI definitions Tatyana Nikolova
2021-01-28 3:57 ` [PATCH rdma-core 3/5] rdma-core/irdma: Add user/kernel shared libraries Tatyana Nikolova
2021-01-28 13:32 ` Jason Gunthorpe [this message]
2021-01-28 3:57 ` [PATCH rdma-core 4/5] rdma-core/irdma: Add library setup and utility definitions Tatyana Nikolova
2021-01-28 13:34 ` Jason Gunthorpe
2021-01-28 3:57 ` [PATCH rdma-core 5/5] rdma-core/irdma: Implement device supported verb APIs Tatyana Nikolova
2021-01-28 13:36 ` Jason Gunthorpe
2021-01-28 13:26 ` [PATCH rdma-core 0/5] Add irdma user space provider for Intel Ethernet RDMA Leon Romanovsky
2021-01-28 13:37 ` Jason Gunthorpe
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