From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) (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 9BDAA28643C for ; Thu, 2 Apr 2026 16:03:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775145793; cv=none; b=FnuZM+WOvYwQ1p/6g0y/ABFbd9XPEpwDOl4b7DMom2fGGHUThp5cczgMJM11tCtzjFUqYw5oDP4GOeA33FtWf6yGSH7qoRWVTblRW2FV5ZYTnRioqHkbV43uT+eNoh5lsg/Gmnxuz1zfJ13zrvhcGLHNGLzdZwPbU30RSnT8YCM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775145793; c=relaxed/simple; bh=Mm2YYx0g/jXisS8cGXfYHq/4evFs6yazjodt1RAx87U=; h=Date:From:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=HxmcliHC6EWfCZgl6fseqZe3kuttfJ5YEJxsk1C9SM5sYBRBrEGcFJ6Y67gGhkLIjUUWcXaDYjU17ubn9jhVgdlv6cxTc2BJ5Yu5IRaULN6c1oOO970EX7CYce/oNH8Lygls4n5OCYeRZHCovkr0l/m+WFWca3Pm1KQaJ9R1ZIw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=hjGokgI5; arc=none smtp.client-ip=209.85.214.172 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=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="hjGokgI5" Received: by mail-pl1-f172.google.com with SMTP id d9443c01a7336-2b2591757fbso124035ad.0 for ; Thu, 02 Apr 2026 09:03:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1775145792; x=1775750592; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:from:date:from:to:cc:subject:date:message-id:reply-to; bh=pCnmZKRIMS35Lh57vQ/HsyrBXVgqJJZgqbAADUnFMI0=; b=hjGokgI5IXt/6SuRLa7SHD4RbV+mPa3nfp31KR3uejijIHOCFRWGRw7Jwtc3jF3hD8 dKC55fKUxlvYWuaoTpnIv8de9bNTTaZos5cDR2gQ2emPMfU08+pIZ4daJ6uOsKMmGrSc JALqQFDLTDBoedinrKq15MzwN2avbwn4ZlGYrcFKBG2O1hYzFbNDKGGz6JDccukpi9VE dWzivg1kY9XYNsVPQ0q6hqZefgHJDn0nXo538xKux0Qq/QlyRRK5f5mYlm3XaWtVQHo5 Kj4EfrKTvQf1zndJPDptxFURlAIv1qyVIUy5QZIrMKhjDwwWASaMURv+uMVHX5H9cLoT 41JA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775145792; x=1775750592; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:from:date:x-gm-gg:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=pCnmZKRIMS35Lh57vQ/HsyrBXVgqJJZgqbAADUnFMI0=; b=VROL4OlTfKucaXE0uwTAJp+TZBqco9VXRw+PuStROKEJ0cRD8IAcX+9jJfhaNV8uqG bzLPxHGcbBdx0zHAUKcG4otX1FIKK0cCWhJrF7u6usw+2X9UYWscajHku9IY2aX0AOrx 3SK7TxgKfjbz/IKWedhvilK+jkUIrEyjUDrovQQ3+8hi1l5xdgBPss66LskXCRr0FpW4 tp6Z51bpPTppurJV6Zxs45k8SDh4ZubZMJejNp+rgBZsTUVd+2Yus9+Gx/z6vTdphzRd whGMEviIFhBwBRJ6FsFNGhl9lSq90HSSO2+YAa/AArvUi3GGXT3K/rFsnfyIv93v4G64 vL4A== X-Forwarded-Encrypted: i=1; AJvYcCWiR0nxkP6t6Id8nWVCbTxT2CIGnrZtmzcAprDeTsXnnvZjw/wZ9F6DYeBBVK/Dm3rALnh9jym77M/wpAM=@vger.kernel.org X-Gm-Message-State: AOJu0YwISlYcDvK52MKzCndh1IhO9MBssuFZ73DW9LLkUWi/xUmCaavX lBJKpAacXDcvZYlEUzsMHq/0r8BhFJlrDP9ey8jFZ7kS4agA5L4C53L7l2tqHHkT1kGO2wYM49b cHvCLew== X-Gm-Gg: AeBDietzT8OR+p8GY53V7Yie1bex5pa8/f9OGGHK3kvvIi+XOqpgN5Jh61oyoHXqD5X 8JwwAblD1UHxEKzw07oWl+7Sjn3vdCH9NToI0viv+IbxUTQUON5MfREOed+GnFNRrtzP3t5p2di fa4avHjZ+Z8Y9D+gGMjue8HZaxcGkLrRVsCv2H9uOn5QsfhtiKbuz1mfajJC2gIPuGSMUx4Yb52 R2agiKAK/s8KkJZadD1xIl5xjsCvMDZgd3duBTbPfABQPc9/oE4RKygbZGGdomepQDSyDWj6LeL yKdzV3NjPbF/orSYw9N0hy83b+ZQwKwFV/c8Ch9LgV/cS1s+wINrRjCNQ9s1G6Pybn0vyPZjbso FsLCLM05k8BLq1UY3LpT3+USMOcoVmMsc96q7zBRLOhmNT90ZjVdtdwfCSZRlRwOFFdcCFDZzeT yOQ5GfaNdPTpqCB5ywXt5qWLTrbKkG/u71rGTxq0Ih8iRWsUnlDRB3UTch4Q== X-Received: by 2002:a17:902:db04:b0:2b2:4a2e:5dd5 with SMTP id d9443c01a7336-2b278424fa6mr2381835ad.3.1775145791219; Thu, 02 Apr 2026 09:03:11 -0700 (PDT) Received: from google.com (10.129.124.34.bc.googleusercontent.com. [34.124.129.10]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35dbe9377b7sm11237137a91.10.2026.04.02.09.03.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Apr 2026 09:03:10 -0700 (PDT) Date: Thu, 2 Apr 2026 16:03:04 +0000 From: Pranjal Shrivastava Cc: kbusch@kernel.org, axboe@kernel.dk, hch@lst.de, sagi@grimberg.me, linux-nvme@lists.infradead.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, kch@nvidia.com Subject: Re: [RFC PATCH v2] nvme: enable PCI P2PDMA support for RDMA transport Message-ID: References: <20260402073001.2039625-1-shivajikant@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260402073001.2039625-1-shivajikant@google.com> On Thu, Apr 02, 2026 at 07:30:01AM +0000, Shivaji Kant wrote: > 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 > --- > [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_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, > }; > +Chaitanya. Hi Chaitanya, would you like to pick this up with your v2 for the multipath p2p enablement series [1] ? For the changes (with Chaitanya's mpath patch): Reviewed-by: Pranjal Shrivastava Thanks, Praan [1] https://lore.kernel.org/all/20260323234416.46944-3-kch@nvidia.com/