From nobody Sun Jun 14 05:10:07 2026 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (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 EAA35313E03 for ; Mon, 6 Apr 2026 09:21:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775467301; cv=none; b=Rw4q1fBQLYrFnaYYCq7fwXKizM+98yQ4FYu6hdiLcw6Uw0VgC67x4sYQY0BCXyjK9WtV5L27ObIyg2KmqeA953oRVMC422qXNP/VlCjOmRUXSpbCXni2QF0UNqhmG9pMFTMEzdotWQMlMyATY7NjBAbuRJYapXz/TDspkpJPRKw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775467301; c=relaxed/simple; bh=fn+IBnDbfxTI4SRNrjqrYY1Mf+GVGPS+hAM6OVyNWPQ=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=KxPtziqw1G9GQ/bcbfvmeW6moIyddg/wOUeiGXuzd7SACghc9W5zwuvw8p6z1mVhorK2rYU6/ADR2jNfebGSPFV/Kyhvyyf82ofJ6ZAIZ7vh4cuSDV0Md2Jud6BRoreDI0jTQjI45UZLVrjlM5aHZuLRPRA4pM9ilLjB2xDKKmY= 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=209.85.216.73 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-f73.google.com with SMTP id 98e67ed59e1d1-3568090851aso9751904a91.1 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=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=g3C2deEn/B06yQx0/PPxiR9uR8QVd3J/fG45947Jn5MZDwjyJ9yjRRziut6CRjeNFD BLzpWuZqYqkyL2Sw5TBHjYObgP03AdtLxj1dYFTuId0ssBd6vQ/mZWWGrNPrv1553F84 JU+HX7Y1BLrSCiMwdf5kGtuy2+toizPCiiYYfhou27HxL9Mlg/HNrX/XW3ZZjac/CImv zdmPX7dADRWt31bxWtlxgay8IWqcwufjOd4rvAaro7heeJNLU7DRGntriZ/eKEehm/aM w5Jyya2IGsRGaIPuUU/wK9qTr+hU/45OOLtPmbDbt4lkLcrG5MblWnSvHB/L7AQm1VW2 /OKA== X-Forwarded-Encrypted: i=1; AJvYcCWqAdpZquhaxuJL4n4e9pX1MLvEq77RLOQ3cWkLdv7FTmqkhliLP1KxsWE69GlgvXnfMJN/ImaFt0iYDx4=@vger.kernel.org X-Gm-Message-State: AOJu0YxttE57l+lLXIfRZlcuA1srBRKK4atyXil/IJTfQvrEKe/aGCmE E8kaGkJjGUMxUQQHl+k/HhrTRJG2uWfDstRMqaraniD/Itn/ekLbYA5AGkZTwUh1gPh5EqiXXgi x5sTzwzeXFofy+2igmr82tnhDDw== 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-kernel@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-Transfer-Encoding: quoted-printable 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 Reviewed-by: Christoph Hellwig --- 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_st= ruct *work) nvme_rdma_reconnect_or_remove(ctrl, ret); } =20 +static bool nvme_rdma_supports_pci_p2pdma(struct nvme_ctrl *ctrl) +{ + struct nvme_rdma_ctrl *r_ctrl =3D 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 =3D { .name =3D "rdma", .module =3D THIS_MODULE, @@ -2203,6 +2210,7 @@ static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = =3D { .get_address =3D nvmf_get_address, .stop_ctrl =3D nvme_rdma_stop_ctrl, .get_virt_boundary =3D nvme_get_virt_boundary, + .supports_pci_p2pdma =3D nvme_rdma_supports_pci_p2pdma, }; =20 /* --=20 2.53.0.1213.gd9a14994de-goog