From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F0FF031C57B for ; Mon, 6 Apr 2026 09:21:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775467302; cv=none; b=U8JVw6Ki1M20YtG19o6KMn1NEZA69f0glJ2ximlMF+AmasR9wPPRhANoxol0fPviLgeEO3+CfMCUudVTA4J3DoCN0NWLd6MsLb/LOBJoURSkv2AdghNFNNh29/HgUdJa26gIqRnH/1KuFFQWg+b7EQ69SHwznOYMYxMGdOYBCcw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775467302; c=relaxed/simple; bh=fn+IBnDbfxTI4SRNrjqrYY1Mf+GVGPS+hAM6OVyNWPQ=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=HSboyU6fNosVl+XdPhHxCrn5GPuBQq+SMWwqERwoYOGqjsZO1d/+CbET19otla0izMVio90wsiot12Dqst76j84iDEnQtX16f+tiV7niSSJHYRp/IcYNBvIY4nxD94soHR+T/4mIb1gKS2CU6UyDBgI9ZhUD3cHsjStHfHlCrhA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--shivajikant.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=IWx4PM9s; arc=none smtp.client-ip=209.85.216.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--shivajikant.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="IWx4PM9s" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-35da37203d2so8654227a91.3 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=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=BDX1PhWlT04ihT2rWEm0Zx1VkEl3UrtVSdzsbOx4DV8=; b=IWx4PM9sjsjG2JTin73gx4jEVusSXXFSYG0ks8PZABCoh0R9rgLj17fAWjz5BeL06/ ZPV2NN58yOdGYP2W3iFPL/CZ+u78FjsvHHL5zLaEF83mOo7DaxETFlJsDhHrcMYaxPJo nABJIHrIX1jNHOhNSJPrlunEvQvyc/abMBI4zN9JCH7jpdnQBFaqCqaBXBgU/SHeNEE0 d543woFSKMrjz3HrZ7KUuMtvEuZJjouCzY+VkxNuYkW3ZNYVMJ1f89OshOrmTjrLfWv3 zFAT2McHzg2ik6Y+KiJq5QrbFxc5n5AfwFuADpT36Ktb9TIfxUAUCDAr9dEg3XV7zjvJ 6QWA== 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=dsqSrKIeo4hotfx7f25Gl67TPcbQmOE6oJMY8R8W9xZHIDnrNFp+QkWqpwxTBDtL/u algIE7aZe5zE7l3Lo7V5rsGyMcgQE878ufbRtkLPRhvIuEE0b5jANASsRkO4o1LxwAQv 1sGFovNYj4r3+5/1rCXJ7IhlgayXqWKMp8wWVcuvbT00V7E2rSCOWmehrCKHOMBZj/8v Z4N6WFVq1jKOZb60F/O4JoqXKvpZnRdUD6pVHv8J+pQ9dmYvKKZcRIptJsrE1wvzAEf4 jjWdtgd8zP4Odpo2bTy9enH/N2plTEyBLQBXzB0C7GI8KY05ZSvUVVhDONCJZDBfoDi9 WgcQ== X-Forwarded-Encrypted: i=1; AJvYcCUrPLOgDANw1gYiXRD2Ikknls+SF6e7XF1yLvZY8CfQfyeGGLNuZNA7OMS8b/kEwcBt8SwTT3cLsM8l@vger.kernel.org X-Gm-Message-State: AOJu0YxmzZeOD2CF34sEpsVxVuLB00cTvhnfy3EKk4xmQgbPANOaOuhJ W1IdBEwuqdKssmeH8jBO80HFxQ4xB+/FxluHdQ74TX7l7eztrggzINW959pJ3LmWpbsqDQTnDoB gKtiosFkdELAjOwRrJpZlhlxyKw== 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 Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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" 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