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 571CA33D4FE; Fri, 9 Jan 2026 21:27:02 +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=1767994024; cv=none; b=jma4mp3N5rZhC6spuCqOQSnhAZiGIDikNMdJ3efIEvbYYrICiwo3IjFJLFAu8p/0iemiaEp2oFZppUZauw+QjcD18lJtH1UfeV7GnLWMVyld1vyPUwRWzsMpHfmjWwiazcOuzyzWFOd2ZzOdjOflwvGioQQT70TwauLf/cGXAHA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767994024; c=relaxed/simple; bh=6AqnwgESmuZWzQuL9VadtW6Ig/bHu4+Zf8hGnfqCmFQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ndjoh2L8/EFGmmexsrx6B+k4aFH9yv+NUJBjiY/PRg019qWIcODQHl0QjgZ/0qRxKoKlZ4pMW9U8LaPzWSmsdnc7zbPyBJyAlFKoFcqL9vq4gnSUBAx03F8kiVoitkY2p0LnMDFDH9iwnhcLIZ6OUeoX5OdqopiN035DoHOub7A= 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=bPv3GCkZ; 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="bPv3GCkZ" 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=xfr5zKpQYn33okOryLGky3ansD/ozk3kM3Fppbz8fgI=; b=bPv3GCkZSH4lwyS+oglTkkxX4Y H01Hj1X1bxL7n/PNQ0t6NBj+eRofAMfBGJZQZAANaqDpsX2/KYWkJX1t1qQtge9kT42IbtiUqYrj/ tzzfCHKmw7DC6LXNs2EfQJgBUFp2NHnYJZCCbDaM1/tNGOPrVqOV86stslh5vh1eK92PUEBUhfymi xAlTffA08T/qtbcVw+31hmFqZg166dpr50qAYxJWMR/0kS03c3j4X1oRjP5KfbQIctzwgpMPIGoBT 5Aa15It4h9xMVzOH55QehhqsBL7Mr1bZ69BVgqsfvrB5c8TIVj97/vltt3fv1bJ2J1p7kELlwj/7H hQ1VDclg==; 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 1veK0G-00053X-0L; Fri, 09 Jan 2026 22:26:40 +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 v5 05/16] net: Proxy net_mp_{open,close}_rxq for leased queues Date: Fri, 9 Jan 2026 22:26:21 +0100 Message-ID: <20260109212632.146920-6-daniel@iogearbox.net> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260109212632.146920-1-daniel@iogearbox.net> References: <20260109212632.146920-1-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 1.0.9/27875/Fri Jan 9 08:26:02 2026) From: David Wei When a process in a container wants to setup a memory provider, it will use the virtual netdev and a leased rxq, and call net_mp_{open,close}_rxq to try and restart the queue. At this point, proxy the queue restart on the real rxq in the physical netdev. For memory providers (io_uring zero-copy rx and devmem), it causes the real rxq in the physical netdev to be filled from a memory provider that has DMA mapped memory from a process within a container. Signed-off-by: David Wei Co-developed-by: Daniel Borkmann Signed-off-by: Daniel Borkmann Reviewed-by: Nikolay Aleksandrov --- include/net/netdev_rx_queue.h | 4 ++ include/net/page_pool/memory_provider.h | 4 +- net/core/netdev_rx_queue.c | 78 +++++++++++++++++++------ 3 files changed, 66 insertions(+), 20 deletions(-) diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h index de04fdfdad72..508d11afaecb 100644 --- a/include/net/netdev_rx_queue.h +++ b/include/net/netdev_rx_queue.h @@ -73,4 +73,8 @@ enum netif_lease_dir { struct netdev_rx_queue * __netif_get_rx_queue_lease(struct net_device **dev, unsigned int *rxq, enum netif_lease_dir dir); +struct netdev_rx_queue * +netif_get_rx_queue_lease_locked(struct net_device **dev, unsigned int *rxq); +void netif_put_rx_queue_lease_locked(struct net_device *orig_dev, + struct net_device *dev); #endif /* _LINUX_NETDEV_RX_QUEUE_H */ diff --git a/include/net/page_pool/memory_provider.h b/include/net/page_pool/memory_provider.h index ada4f968960a..b6f811c3416b 100644 --- a/include/net/page_pool/memory_provider.h +++ b/include/net/page_pool/memory_provider.h @@ -23,12 +23,12 @@ bool net_mp_niov_set_dma_addr(struct net_iov *niov, dma_addr_t addr); void net_mp_niov_set_page_pool(struct page_pool *pool, struct net_iov *niov); void net_mp_niov_clear_page_pool(struct net_iov *niov); -int net_mp_open_rxq(struct net_device *dev, unsigned ifq_idx, +int net_mp_open_rxq(struct net_device *dev, unsigned int rxq_idx, struct pp_memory_provider_params *p); int __net_mp_open_rxq(struct net_device *dev, unsigned int rxq_idx, const struct pp_memory_provider_params *p, struct netlink_ext_ack *extack); -void net_mp_close_rxq(struct net_device *dev, unsigned ifq_idx, +void net_mp_close_rxq(struct net_device *dev, unsigned int rxq_idx, struct pp_memory_provider_params *old_p); void __net_mp_close_rxq(struct net_device *dev, unsigned int rxq_idx, const struct pp_memory_provider_params *old_p); diff --git a/net/core/netdev_rx_queue.c b/net/core/netdev_rx_queue.c index 3da628088a3c..2e4eeda4fcfe 100644 --- a/net/core/netdev_rx_queue.c +++ b/net/core/netdev_rx_queue.c @@ -71,6 +71,29 @@ __netif_get_rx_queue_lease(struct net_device **dev, unsigned int *rxq_idx, return rxq; } +struct netdev_rx_queue * +netif_get_rx_queue_lease_locked(struct net_device **dev, unsigned int *rxq_idx) +{ + struct net_device *orig_dev = *dev; + struct netdev_rx_queue *rxq; + + /* Locking order is always from the virtual to the physical device + * see netdev_nl_queue_create_doit(). + */ + netdev_ops_assert_locked(orig_dev); + rxq = __netif_get_rx_queue_lease(dev, rxq_idx, NETIF_VIRT_TO_PHYS); + if (rxq && orig_dev != *dev) + netdev_lock(*dev); + return rxq; +} + +void netif_put_rx_queue_lease_locked(struct net_device *orig_dev, + struct net_device *dev) +{ + if (orig_dev != dev) + netdev_unlock(dev); +} + bool netif_rx_queue_lease_get_owner(struct net_device **dev, unsigned int *rxq_idx) { @@ -187,49 +210,63 @@ int __net_mp_open_rxq(struct net_device *dev, unsigned int rxq_idx, const struct pp_memory_provider_params *p, struct netlink_ext_ack *extack) { + struct net_device *orig_dev = dev; struct netdev_rx_queue *rxq; int ret; if (!netdev_need_ops_lock(dev)) return -EOPNOTSUPP; - if (rxq_idx >= dev->real_num_rx_queues) { NL_SET_ERR_MSG(extack, "rx queue index out of range"); return -ERANGE; } - rxq_idx = array_index_nospec(rxq_idx, dev->real_num_rx_queues); + rxq_idx = array_index_nospec(rxq_idx, dev->real_num_rx_queues); + rxq = netif_get_rx_queue_lease_locked(&dev, &rxq_idx); + if (!rxq) { + NL_SET_ERR_MSG(extack, "rx queue peered to a virtual netdev"); + return -EBUSY; + } + if (!dev->dev.parent) { + NL_SET_ERR_MSG(extack, "rx queue is mapped to a virtual netdev"); + ret = -EBUSY; + goto out; + } if (dev->cfg->hds_config != ETHTOOL_TCP_DATA_SPLIT_ENABLED) { NL_SET_ERR_MSG(extack, "tcp-data-split is disabled"); - return -EINVAL; + ret = -EINVAL; + goto out; } if (dev->cfg->hds_thresh) { NL_SET_ERR_MSG(extack, "hds-thresh is not zero"); - return -EINVAL; + ret = -EINVAL; + goto out; } if (dev_xdp_prog_count(dev)) { NL_SET_ERR_MSG(extack, "unable to custom memory provider to device with XDP program attached"); - return -EEXIST; + ret = -EEXIST; + goto out; } - - rxq = __netif_get_rx_queue(dev, rxq_idx); if (rxq->mp_params.mp_ops) { NL_SET_ERR_MSG(extack, "designated queue already memory provider bound"); - return -EEXIST; + ret = -EEXIST; + goto out; } #ifdef CONFIG_XDP_SOCKETS if (rxq->pool) { NL_SET_ERR_MSG(extack, "designated queue already in use by AF_XDP"); - return -EBUSY; + ret = -EBUSY; + goto out; } #endif - rxq->mp_params = *p; ret = netdev_rx_queue_restart(dev, rxq_idx); if (ret) { rxq->mp_params.mp_ops = NULL; rxq->mp_params.mp_priv = NULL; } +out: + netif_put_rx_queue_lease_locked(orig_dev, dev); return ret; } @@ -244,38 +281,43 @@ int net_mp_open_rxq(struct net_device *dev, unsigned int rxq_idx, return ret; } -void __net_mp_close_rxq(struct net_device *dev, unsigned int ifq_idx, +void __net_mp_close_rxq(struct net_device *dev, unsigned int rxq_idx, const struct pp_memory_provider_params *old_p) { + struct net_device *orig_dev = dev; struct netdev_rx_queue *rxq; int err; - if (WARN_ON_ONCE(ifq_idx >= dev->real_num_rx_queues)) + if (WARN_ON_ONCE(rxq_idx >= dev->real_num_rx_queues)) return; - rxq = __netif_get_rx_queue(dev, ifq_idx); + rxq = netif_get_rx_queue_lease_locked(&dev, &rxq_idx); + if (WARN_ON_ONCE(!rxq)) + return; /* Callers holding a netdev ref may get here after we already * went thru shutdown via dev_memory_provider_uninstall(). */ if (dev->reg_state > NETREG_REGISTERED && !rxq->mp_params.mp_ops) - return; + goto out; if (WARN_ON_ONCE(rxq->mp_params.mp_ops != old_p->mp_ops || rxq->mp_params.mp_priv != old_p->mp_priv)) - return; + goto out; rxq->mp_params.mp_ops = NULL; rxq->mp_params.mp_priv = NULL; - err = netdev_rx_queue_restart(dev, ifq_idx); + err = netdev_rx_queue_restart(dev, rxq_idx); WARN_ON(err && err != -ENETDOWN); +out: + netif_put_rx_queue_lease_locked(orig_dev, dev); } -void net_mp_close_rxq(struct net_device *dev, unsigned ifq_idx, +void net_mp_close_rxq(struct net_device *dev, unsigned int rxq_idx, struct pp_memory_provider_params *old_p) { netdev_lock(dev); - __net_mp_close_rxq(dev, ifq_idx, old_p); + __net_mp_close_rxq(dev, rxq_idx, old_p); netdev_unlock(dev); } -- 2.43.0