From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from www62.your-server.de (www62.your-server.de [213.133.104.62]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4908136BCE9; Tue, 13 Jan 2026 23:23:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.133.104.62 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768346613; cv=none; b=s6qY7P3/YOBiC12F5qBAPtvL8zIvO7v/Yq4vGRXOmBvrT2IQstw3iPjQZy1Cgq/kLoWh4FbQa0ysM47gvmnoJsG6ymy0TxQRxAHoShHhKXpfnpxSI7iEzE1WdgjSCZeUfXrBaSSOhVCGXMekFkRFdV6zHH2EBMFkB+aXjdUnKr8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768346613; c=relaxed/simple; bh=MZfEByh+9dl0thDVWSYPQbzKvrntUG3X1FtuXaD+Hac=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hnxrs8dy5thhAv/xv5S22eKsKjuq1xWjWDcLC0kxN60RJSm0GkDr4ybnC1HB1uOyZcsyLCd0Yxtf2EwL+KQQNOybNJ+AVovri5XOgPc3yZkchv3BXtTUH6pCQUcKCDhvQaUJulEfYsocyjR0BY1Oz75/a0Rop0TnS6J2i3RirOA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=iogearbox.net; spf=pass smtp.mailfrom=iogearbox.net; dkim=pass (2048-bit key) header.d=iogearbox.net header.i=@iogearbox.net header.b=OLN5F25Y; arc=none smtp.client-ip=213.133.104.62 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=iogearbox.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iogearbox.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=iogearbox.net header.i=@iogearbox.net header.b="OLN5F25Y" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=iogearbox.net; s=default2302; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID; bh=kDPOfxKZxMLXp+34wuu3rEJf6xcjKsdKBrNkbxQ+SfU=; b=OLN5F25Ymc7U8P0MG0CM+sPjEw o+AdkpJqX0HP3xjG8m857Py4aGdCHbavQM6TEGLHOAIGg17GPpaIaqXWTKtpeMDHNnwuGO27c//3q 5vroPykmpwfoBTHaCnPhINJlBEdrM+j35MNuamvPukHZmq7XiniGpaUeVEH6WQmbF0QHEhbRwasRk anEn0jxNF9X+fC5Jbz99Jdb4YcUEFqUE8TvATr2IznzEKbvsk/GkLdwJ8QNquWnvudiqVDIsd8d+b CH3ugauWaGgIU4bcbNuTNdARVPFpiYikkDXpM4AvxI5W8Lp78Fj4ZePJrf2r9XQgVt34E/hLmYjDF 3/zQNtmg==; Received: from localhost ([127.0.0.1]) by www62.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1vfnj8-0003X0-26; Wed, 14 Jan 2026 00:23:06 +0100 From: Daniel Borkmann To: netdev@vger.kernel.org Cc: bpf@vger.kernel.org, kuba@kernel.org, davem@davemloft.net, razor@blackwall.org, pabeni@redhat.com, willemb@google.com, sdf@fomichev.me, john.fastabend@gmail.com, martin.lau@kernel.org, jordan@jrife.io, maciej.fijalkowski@intel.com, magnus.karlsson@intel.com, dw@davidwei.uk, toke@redhat.com, yangzhenze@bytedance.com, wangdongdong.6@bytedance.com Subject: [PATCH net-next v6 06/16] net: Proxy netdev_queue_get_dma_dev for leased queues Date: Wed, 14 Jan 2026 00:22:47 +0100 Message-ID: <20260113232257.200036-7-daniel@iogearbox.net> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260113232257.200036-1-daniel@iogearbox.net> References: <20260113232257.200036-1-daniel@iogearbox.net> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Virus-Scanned: Clear (ClamAV 1.4.3/27879/Tue Jan 13 08:26:16 2026) From: David Wei Extend netdev_queue_get_dma_dev to return the physical device of the real rxq for DMA in case the queue was leased. This allows memory providers like io_uring zero-copy or devmem to bind to the physically leased rxq via virtual devices such as netkit. Signed-off-by: David Wei Co-developed-by: Daniel Borkmann Signed-off-by: Daniel Borkmann --- net/core/netdev_queues.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/net/core/netdev_queues.c b/net/core/netdev_queues.c index fae92ee090c4..97acf6440829 100644 --- a/net/core/netdev_queues.c +++ b/net/core/netdev_queues.c @@ -9,16 +9,29 @@ * @dev: net_device * @idx: queue index * - * Get dma device for zero-copy operations to be used for this queue. + * Get dma device for zero-copy operations to be used for this queue. If the + * queue is leased to a physical queue, we retrieve the latter's dma device. * When such device is not available or valid, the function will return NULL. * * Return: Device or NULL on error */ struct device *netdev_queue_get_dma_dev(struct net_device *dev, int idx) { - const struct netdev_queue_mgmt_ops *queue_ops = dev->queue_mgmt_ops; + const struct netdev_queue_mgmt_ops *queue_ops; struct device *dma_dev; + if (idx < dev->real_num_rx_queues) { + struct netdev_rx_queue *rxq = __netif_get_rx_queue(dev, idx); + + if (rxq->lease) { + rxq = rxq->lease; + dev = rxq->dev; + idx = get_netdev_rx_queue_index(rxq); + } + } + + queue_ops = dev->queue_mgmt_ops; + if (queue_ops && queue_ops->ndo_queue_get_dma_dev) dma_dev = queue_ops->ndo_queue_get_dma_dev(dev, idx); else -- 2.43.0