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 5E5A137416A; Fri, 20 Mar 2026 22:18:48 +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=1774045130; cv=none; b=j14cAM7lBbSWWPhfRDi1QlMAJ84YHW0d8MtHgb/Ejw90lGQyhaV6fUoDZ9Vs/fbvKyGkw3JIc1orWcwuNULy9wk1gRLkwfWhBljcT0Udr/fAyBFZu68vmQgRsIr8VtxArxa8WDMsof03Z2gx3cJf5umS79uUsCpiYWt4kJJTtME= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774045130; c=relaxed/simple; bh=RwNAOvQwh9t8CDdPG5sGY28ifTbCvfoQ1QJMUsWtrII=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Fkf6utAs4qxw4A9/o0w/1kEYRwajfOfpThMquPL1uGu9Bq8pfzpsltvLsBOlyzz2sKJW263QAkXRQxMdLYCxBt7Z9onl1iN7mKFLdYr783oLZHYuXh5+RFSHKZPXxPAqTK+c4v+wOB98orQm5qbt1mI8hpRPkQsQT0W0q8COL1o= 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=STyqM3HY; 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="STyqM3HY" 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=6Su5fFOYtBqb5fkakDbNN1MfExKHkz/9+r9F5WAzx80=; b=STyqM3HY4IjZ3AsWLsL4gtXx5s YC3SzX1uRvCCyo8sfgmSrB6NNIVACnlRmSYe7uTDiAtMZ6M/wMyixEmd7UK9k9Eyy4SPBb63i/nmP uzo4Fbf2dJpS8/2975iScNr8YLGMOA3h+8usqDhnMi6XBgYr5cSj96b4+ZN6PJt1b4KRTeCbCzVPI EKGTKyysWahDQs+hLdABDPXq5/32gS1Q1gne8JNedLAafDkUHXtkMQOjGKvwDFly9TgIB/Xv0mHkj bDH8rlx5kdjR+UExtSYxmGJzws8CsfurBPqA+715/WmyMdTMCXoUrnsps/uU4TaCPmx6BjxUDBOe0 sG83m/Ng==; 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 1w3iAi-000GzO-2m; Fri, 20 Mar 2026 23:18:24 +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 v9 07/14] net: Proxy netdev_queue_get_dma_dev for leased queues Date: Fri, 20 Mar 2026 23:18:07 +0100 Message-ID: <20260320221814.236775-8-daniel@iogearbox.net> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260320221814.236775-1-daniel@iogearbox.net> References: <20260320221814.236775-1-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 1.4.3/27946/Fri Mar 20 07:24:31 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 --- include/net/netdev_queues.h | 3 ++- net/core/netdev_queues.c | 36 ++++++++++++++++++++++++++++-------- 2 files changed, 30 insertions(+), 9 deletions(-) diff --git a/include/net/netdev_queues.h b/include/net/netdev_queues.h index 567bc2efde6d..260558192ab1 100644 --- a/include/net/netdev_queues.h +++ b/include/net/netdev_queues.h @@ -380,7 +380,8 @@ static inline unsigned int netif_xmit_timeout_ms(struct netdev_queue *txq) get_desc, start_thrs); \ }) -struct device *netdev_queue_get_dma_dev(struct net_device *dev, int idx); +struct device *netdev_queue_get_dma_dev(struct net_device *dev, + unsigned int idx); bool netdev_can_create_queue(const struct net_device *dev, struct netlink_ext_ack *extack); bool netdev_can_lease_queue(const struct net_device *dev, diff --git a/net/core/netdev_queues.c b/net/core/netdev_queues.c index 92a0b6b2842f..437e9cd0cc7a 100644 --- a/net/core/netdev_queues.c +++ b/net/core/netdev_queues.c @@ -6,27 +6,47 @@ #include "dev.h" +static struct device * +__netdev_queue_get_dma_dev(struct net_device *dev, unsigned int idx) +{ + const struct netdev_queue_mgmt_ops *queue_ops = dev->queue_mgmt_ops; + struct device *dma_dev; + + if (queue_ops && queue_ops->ndo_queue_get_dma_dev) + dma_dev = queue_ops->ndo_queue_get_dma_dev(dev, idx); + else + dma_dev = dev->dev.parent; + + return dma_dev && dma_dev->dma_mask ? dma_dev : NULL; +} + /** * netdev_queue_get_dma_dev() - get dma device for zero-copy operations * @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 from a physical queue, we retrieve the physical queue'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) +struct device *netdev_queue_get_dma_dev(struct net_device *dev, + unsigned int idx) { - const struct netdev_queue_mgmt_ops *queue_ops = dev->queue_mgmt_ops; + struct net_device *orig_dev = dev; struct device *dma_dev; - if (queue_ops && queue_ops->ndo_queue_get_dma_dev) - dma_dev = queue_ops->ndo_queue_get_dma_dev(dev, idx); - else - dma_dev = dev->dev.parent; + if (!netif_rxq_is_leased(dev, idx)) + return __netdev_queue_get_dma_dev(dev, idx); - return dma_dev && dma_dev->dma_mask ? dma_dev : NULL; + if (!netif_get_rx_queue_lease_locked(&dev, &idx)) + return NULL; + + dma_dev = __netdev_queue_get_dma_dev(dev, idx); + netif_put_rx_queue_lease_locked(orig_dev, dev); + return dma_dev; } bool netdev_can_create_queue(const struct net_device *dev, -- 2.43.0