From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D4D98EF4EC9 for ; Mon, 6 Apr 2026 09:21:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:Cc:To:From: Subject:Message-ID:Mime-Version:Date:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=BDX1PhWlT04ihT2rWEm0Zx1VkEl3UrtVSdzsbOx4DV8=; b=bUl2waXJbMu6BVztlNAP8TATQe 3vWYWLN7yOAdSRSV8akYj7HNcWZV4FkPOIr1/RpznUBYj0dvpAPDI9XPJfI40Wwl5NLTxjZQ1NKsu z4STVpD4j9zVH10MghXaGK9pXvSYz0otxooz+2DEDzsTFU+4qQ/LOPn6kKVAjlXWI/Qj3Y1nDB4bb MfcYnSCeL1+963sWu1DRqzgXVW5//Xls6ndJhMP43QnNZXjYt24xOhdwWq1mMgmuOM1qdP94Qko6m encHCrO8c6J8M78ERdD2OvFVcQYffFvOL8tFd3aLXvT5IgKeHoMz8FL1BpKClQ9oSIgggz+kAS6iw m/F4aVyA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w9g9P-00000004xPM-18Lz; Mon, 06 Apr 2026 09:21:43 +0000 Received: from mail-pj1-x1049.google.com ([2607:f8b0:4864:20::1049]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w9g9N-00000004xOm-0JLe for linux-nvme@lists.infradead.org; Mon, 06 Apr 2026 09:21:42 +0000 Received: by mail-pj1-x1049.google.com with SMTP id 98e67ed59e1d1-3568090851aso9751906a91.1 for ; Mon, 06 Apr 2026 02:21:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1775467299; x=1776072099; darn=lists.infradead.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=BDX1PhWlT04ihT2rWEm0Zx1VkEl3UrtVSdzsbOx4DV8=; b=aZKWg/qZfkyqffHUwfqeB+RsjoGyAPiifQCUf3OXUSAO2SlKHt6WRIh+Wyy45twaBw obqxiRTMEtT1P/tJfBxdFQw1N6DpX5uIr/01z3GVwhdjpMTIdpY8mJWMjX3/pGPkkCij mrkepUWLW8Bjlf2FBVGx9yVp8I2QZ8CIbN7UNyXKb5LAerbYZoOjPdmdQis7/UkefCN9 zQbQ6FCEnOfItbgIPCBVdV+rrNPjmhredpmfERgM/wmB612KiXtY5QUlVfkyYLkW9KUc ueDxe06PJPewEv5bBe/GXXC53eEi5VFtX+7CfgvJR7mXI2jZrwHz8S3RsdXlXndv3cfE ob+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775467299; x=1776072099; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=BDX1PhWlT04ihT2rWEm0Zx1VkEl3UrtVSdzsbOx4DV8=; b=AFekbY7yQ1myZAGgCEzLN9pFsM4WSyR9KliL9Xo5+IXw5cDtndl/EDGbtqVuq1iJ4T BgTz1aqOMNi1rjzGKGmGmTDW4CflRA2mfYw9pHDRGSbzwQuBEjvHfVR5VRmKeqK/XWGC 4ZgDYRByJ0+4OWHSJkfjXiLbe+p4KiykJXBLeealNYHXYfjaet/FCYbEI73xhbXT72eO HNClVH1+fHUFue4cpVYmxL6dWcAdiXSvfI3a5p3gPhUQ/cjwpCZaNctGhrw54Ad8TP29 1CzCJIT/dp6YwdzkR6kp28WyaMGM15nB+iYKvIqh9OnodJlCs1rkotTfQGWyVdk/fndf nRBA== X-Gm-Message-State: AOJu0Yxzs8Xo3St1BqNz0Vn71NYh8CnIQwyLxYVQkNS0k0IbJLAUDYYM yYjcAMQjnhN0ZsTDpp0liozuYhr8QGu0jPP7EwCztel12s3dBpO17sM2Il+XBcLr4VsZSxaSgTe J2FhwRc7z+eW+Kl+qgX5g8d1P4g== X-Received: from pgkp23.prod.google.com ([2002:a63:f457:0:b0:c73:987f:4708]) (user=shivajikant job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6300:210d:b0:38b:d9b5:5de2 with SMTP id adf61e73a8af0-39f2f1080f2mr11734892637.50.1775467298997; Mon, 06 Apr 2026 02:21:38 -0700 (PDT) Date: Mon, 6 Apr 2026 09:21:32 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.53.0.1213.gd9a14994de-goog Message-ID: <20260406092132.1333458-1-shivajikant@google.com> Subject: [PATCH v3] nvme: enable PCI P2PDMA support for RDMA transport From: Shivaji Kant To: kbusch@kernel.org, axboe@kernel.dk, hch@lst.de, sagi@grimberg.me, henrique.carvalho@suse.com Cc: linux-nvme@lists.infradead.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Shivaji Kant , Pranjal Shrivastava Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260406_022141_119673_2A396D46 X-CRM114-Status: GOOD ( 11.66 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Enable BLK_FEAT_PCI_P2PDMA on the NVMe when the underlying RDMA controller supports it. Suggested-by: Pranjal Shrivastava Reviewed-by: Pranjal Shrivastava Reviewed-by: Henrique Carvalho Signed-off-by: Shivaji Kant --- v2: https://lore.kernel.org/all/20260402073001.2039625-1-shivajikant@google.com/ Changes in v3: Dropped the reference to multiplath patch from git log as commented by Christoph Hellwig. --- drivers/nvme/host/rdma.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 35c0822edb2d..09eefd7c3ff4 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -2189,6 +2189,13 @@ static void nvme_rdma_reset_ctrl_work(struct work_struct *work) nvme_rdma_reconnect_or_remove(ctrl, ret); } +static bool nvme_rdma_supports_pci_p2pdma(struct nvme_ctrl *ctrl) +{ + struct nvme_rdma_ctrl *r_ctrl = to_rdma_ctrl(ctrl); + + return ib_dma_pci_p2p_dma_supported(r_ctrl->device->dev); +} + static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = { .name = "rdma", .module = THIS_MODULE, @@ -2203,6 +2210,7 @@ static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = { .get_address = nvmf_get_address, .stop_ctrl = nvme_rdma_stop_ctrl, .get_virt_boundary = nvme_get_virt_boundary, + .supports_pci_p2pdma = nvme_rdma_supports_pci_p2pdma, }; /* -- 2.53.0.1213.gd9a14994de-goog