From nobody Fri Apr 3 19:29:54 2026 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (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 E4EF437C0F5 for ; Thu, 2 Apr 2026 07:30:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775115007; cv=none; b=kR8XB30NtLn+Q2Uv4Yf/ISU7l/zWAk7Pz4NhXunTCPBOaMIQio5h8Uo0giqy4nkqEAieS3gh7SLrJsHjq44lJqF2R0LbH6dxxa+ZpgDeUM6PBt5uTzMkk7NxNwj8LiDekyM+2/+2szGoWZ7dST45AJGrd0PDyagqZo7KF32RQ38= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775115007; c=relaxed/simple; bh=GpDQCFgEMVa6WZvouZwTquTwpu6mWZTVVFjArT8OiNE=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=T+YJnW9Hn+0fUVcJOnxjFUixq3uhtrhmfbwyZGYNv6BXbE+8cqE9/qrmFC2msqRjoUXfaV+JJylHvrefkjRtrvILXU7TJ4g/RPeYV/t6N8yrpoGAc4PM9vIoIrLmBWNc26hrYhwwvqMWNlrwsl2CSF46CLhS3cT/7zNxGhTdjJE= 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=rbna5ldT; arc=none smtp.client-ip=209.85.215.202 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="rbna5ldT" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-bce224720d8so302522a12.1 for ; Thu, 02 Apr 2026 00:30:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1775115005; x=1775719805; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=fi6i98rsnzRjLaE+pBgUUzL0LZaOxpHA+vPLz5+YMnI=; b=rbna5ldTgXXgKVaszaei0gVt3eeQ2wyvRqDNEZ5QQZVyWf4ubUWFdpIOOBRL0qQOAn TD64N7MjladZObscbgGJcyqSMZaH6YigjoYc4K3T0obsPxqBM0iPvEfp+Nc+VfST6Oh3 2ksxA59E+i7aW/qddO0rSTtyBviivZKbhiILvPXMli2phLEqSVjn8sO+pl2HQrmvurW2 54yult4d6fRjF8nU6XWTe14QNqWQ0oJXc60LZEEq51tg5gz5VpUcFqlKUEIhOUAQSWxV 2P8NhvGtL3Dpf/4XI2Bzi5HtubrRLMFxOjlqmbAQgE3rbCDXn9ZVNkU+X2TaS/zLFMCY Jx4w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775115005; x=1775719805; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=fi6i98rsnzRjLaE+pBgUUzL0LZaOxpHA+vPLz5+YMnI=; b=Ujll/d9WXzHNpjL0FyNZRxvPhBvS7X6xKYVw8lyEvmsiNJu6mfVFIn/b4P1Lks2sFk zhmKbvughocoI+iIUNgiwoOhKh7svAA7RKdAWjiUGi4w68I2LsQj8By12MId4TsZjF0K 7AWxz5O5Fs2DjF1tndE8oSu7QxMkBsqyy6iIhpIzhqdCDCWQM6mkJnc/DL8wVfUiG7OF XsyNyJxMPfNnT6MGKpsB1rpuY4AJweESCCi5GoSigXuPYA60K7sAGhf56NvtFkJ/k2DU ziQ69WlQUTnGy91yKpnyHFFY2PbVXxhx8km4gd8zHGFLGzrKBeSxIAF7duO9ILYURqjz VJcg== X-Forwarded-Encrypted: i=1; AJvYcCWDqgmV6VP1JkJke4eQ7vI2JoO0CiGGnS7EIszltvKiNMDVDVJ3hQ4j3WK3Q2Da5uWh8F3P+pPB9QKMGYs=@vger.kernel.org X-Gm-Message-State: AOJu0YyufQ0B+OwJZERPi/I9+92R7CwoaDbxR9LU5HaGNF7KFrjM1s/d uLOipO8vuqUnFQ2XsMTUbxIVVxADzCogFEy1GNv7RrpLUUZ5yUCUZIOeJTNERFARnRiQHWr55ds QAmFZmvrzU7ZFFx/vo6BaKmWUNQ== X-Received: from pfvb22.prod.google.com ([2002:a05:6a00:cd6:b0:82c:6863:427a]) (user=shivajikant job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:3d53:b0:82a:7ad8:75f2 with SMTP id d2e1a72fcca58-82cfbeb58d0mr2498752b3a.56.1775115004949; Thu, 02 Apr 2026 00:30:04 -0700 (PDT) Date: Thu, 2 Apr 2026 07:30:01 +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 2.53.0.1185.g05d4b7b318-goog Message-ID: <20260402073001.2039625-1-shivajikant@google.com> Subject: [RFC PATCH v2] nvme: enable PCI P2PDMA support for RDMA transport From: Shivaji Kant To: kbusch@kernel.org, axboe@kernel.dk, hch@lst.de, sagi@grimberg.me 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. This patch depends on the PCI P2PDMA support added in this patch [1]. Suggested-by: Pranjal Shrivastava Signed-off-by: Shivaji Kant Reviewed-by: Pranjal Shrivastava --- [1] https://lore.kernel.org/all/20260323234416.46944-3-kch@nvidia.com/ --- 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 2.53.0.1185.g05d4b7b318-goog