From patchwork Thu Apr 7 15:47:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12805434 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC43EC433F5 for ; Thu, 7 Apr 2022 15:57:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 74C648D0014; Thu, 7 Apr 2022 11:48:22 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6FE6B8D000C; Thu, 7 Apr 2022 11:48:22 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 54F678D0014; Thu, 7 Apr 2022 11:48:22 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0230.hostedemail.com [216.40.44.230]) by kanga.kvack.org (Postfix) with ESMTP id 418FF8D0012 for ; Thu, 7 Apr 2022 11:48:22 -0400 (EDT) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 00953AD6D7 for ; Thu, 7 Apr 2022 15:48:11 +0000 (UTC) X-FDA: 79330514424.23.2BFD21D Received: from ale.deltatee.com (ale.deltatee.com [204.191.154.188]) by imf31.hostedemail.com (Postfix) with ESMTP id 8BB1320002 for ; Thu, 7 Apr 2022 15:48:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:MIME-Version:References:In-Reply-To: Message-Id:Date:Cc:To:From:content-disposition; bh=7Sd+DHEjEbLvCTO+1GLA/CAMTcKj0omlqCpjlGTFuVQ=; b=CriRiAEXJkw+LFJYjKuYt/+1lT mt+jXOXBcluFIZ+8gDxxPki9Jq4kR1e6VG8sMlSxcRg7vJJoQn3fRAaYslClrcV5gRY9JgS4MrRaD guSwSvY+8KGenNrx3t34xM7m2FriiBPxIPNxBFr7zkgZKRV7gHFzCc/pQhlBAYpukFmaU2HJO43Br F/BcI0AO5tDbZ4Qv16KPAn8FyyU9W4rxI+bE6e7TQwBYeTXW4iPa4ygs1NxUZa4jL9C34tiSLQvV0 DE56+P9LdSMFtMh93c2a1UhCH7q5u4Wu0yTlS6vgnM+bkYTLQ06k/LgTXtARxbvL8bEEAQWNGiBVl WqGOrJhw==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ncUMK-002BBh-Pv; Thu, 07 Apr 2022 09:47:45 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1ncUMD-00021q-9M; Thu, 07 Apr 2022 09:47:37 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org Cc: Stephen Bates , Christoph Hellwig , Dan Williams , Jason Gunthorpe , =?utf-8?q?Christian_K=C3=B6nig?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Jakowski Andrzej , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy , Martin Oliveira , Chaitanya Kulkarni , Ralph Campbell , Logan Gunthorpe , Jason Gunthorpe , Max Gurtovoy Date: Thu, 7 Apr 2022 09:47:07 -0600 Message-Id: <20220407154717.7695-12-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220407154717.7695-1-logang@deltatee.com> References: <20220407154717.7695-1-logang@deltatee.com> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, sbates@raithlin.com, hch@lst.de, jgg@ziepe.ca, christian.koenig@amd.com, ddutile@redhat.com, willy@infradead.org, daniel.vetter@ffwll.ch, jason@jlekstrand.net, dave.hansen@linux.intel.com, helgaas@kernel.org, dan.j.williams@intel.com, andrzej.jakowski@intel.com, dave.b.minturn@intel.com, jianxin.xiong@intel.com, ira.weiny@intel.com, robin.murphy@arm.com, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com, jhubbard@nvidia.com, rcampbell@nvidia.com, jgg@nvidia.com, mgurtovoy@nvidia.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v6 11/21] RDMA/core: introduce ib_dma_pci_p2p_dma_supported() X-SA-Exim-Version: 4.2.1 (built Sat, 13 Feb 2021 17:57:42 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) X-Stat-Signature: zgke8kd6wpb17s7k8p48fwr19iwymrfh Authentication-Results: imf31.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=CriRiAEX; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf31.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 8BB1320002 X-HE-Tag: 1649346491-423413 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Introduce the helper function ib_dma_pci_p2p_dma_supported() to check if a given ib_device can be used in P2PDMA transfers. This ensures the ib_device is not using virt_dma and also that the underlying dma_device supports P2PDMA. Use the new helper in nvme-rdma to replace the existing check for ib_uses_virt_dma(). Adding the dma_pci_p2pdma_supported() check allows switching away from pci_p2pdma_[un]map_sg(). Signed-off-by: Logan Gunthorpe Reviewed-by: Jason Gunthorpe Reviewed-by: Max Gurtovoy --- drivers/nvme/target/rdma.c | 2 +- include/rdma/ib_verbs.h | 11 +++++++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 2fab0b219b25..12258f87ccc8 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -415,7 +415,7 @@ static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev, if (ib_dma_mapping_error(ndev->device, r->send_sge.addr)) goto out_free_rsp; - if (!ib_uses_virt_dma(ndev->device)) + if (ib_dma_pci_p2p_dma_supported(ndev->device)) r->req.p2p_client = &ndev->device->dev; r->send_sge.length = sizeof(*r->req.cqe); r->send_sge.lkey = ndev->pd->local_dma_lkey; diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 69d883f7fb41..79609ab73014 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -4003,6 +4003,17 @@ static inline bool ib_uses_virt_dma(struct ib_device *dev) return IS_ENABLED(CONFIG_INFINIBAND_VIRT_DMA) && !dev->dma_device; } +/* + * Check if a IB device's underlying DMA mapping supports P2PDMA transfers. + */ +static inline bool ib_dma_pci_p2p_dma_supported(struct ib_device *dev) +{ + if (ib_uses_virt_dma(dev)) + return false; + + return dma_pci_p2pdma_supported(dev->dma_device); +} + /** * ib_dma_mapping_error - check a DMA addr for error * @dev: The device for which the dma_addr was created