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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 <dw@davidwei.uk>
Co-developed-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20260115082603.219152-6-daniel@iogearbox.net
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_NETDEV_RX_QUEUE_H
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#define _LINUX_NETDEV_RX_QUEUE_H
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#include <linux/kobject.h>
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#include <linux/netdevice.h>
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#include <linux/sysfs.h>
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#include <net/xdp.h>
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#include <net/page_pool/types.h>
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/* This structure contains an instance of an RX queue. */
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struct netdev_rx_queue {
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struct xdp_rxq_info xdp_rxq;
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#ifdef CONFIG_RPS
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struct rps_map __rcu *rps_map;
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struct rps_dev_flow_table __rcu *rps_flow_table;
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#endif
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struct kobject kobj;
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const struct attribute_group **groups;
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struct net_device *dev;
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netdevice_tracker dev_tracker;
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/* All fields below are "ops protected",
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* see comment about net_device::lock
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*/
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#ifdef CONFIG_XDP_SOCKETS
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struct xsk_buff_pool *pool;
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#endif
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struct napi_struct *napi;
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struct pp_memory_provider_params mp_params;
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struct netdev_rx_queue *lease;
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netdevice_tracker lease_tracker;
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} ____cacheline_aligned_in_smp;
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/*
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* RX queue sysfs structures and functions.
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*/
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struct rx_queue_attribute {
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struct attribute attr;
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ssize_t (*show)(struct netdev_rx_queue *queue, char *buf);
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ssize_t (*store)(struct netdev_rx_queue *queue,
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const char *buf, size_t len);
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};
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static inline struct netdev_rx_queue *
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__netif_get_rx_queue(struct net_device *dev, unsigned int rxq)
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{
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return dev->_rx + rxq;
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}
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static inline unsigned int
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get_netdev_rx_queue_index(struct netdev_rx_queue *queue)
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{
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struct net_device *dev = queue->dev;
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int index = queue - dev->_rx;
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BUG_ON(index >= dev->num_rx_queues);
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return index;
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}
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int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq);
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void netdev_rx_queue_lease(struct netdev_rx_queue *rxq_dst,
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struct netdev_rx_queue *rxq_src);
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void netdev_rx_queue_unlease(struct netdev_rx_queue *rxq_dst,
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struct netdev_rx_queue *rxq_src);
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bool netif_rx_queue_lease_get_owner(struct net_device **dev, unsigned int *rxq);
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enum netif_lease_dir {
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NETIF_VIRT_TO_PHYS,
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NETIF_PHYS_TO_VIRT,
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};
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struct netdev_rx_queue *
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__netif_get_rx_queue_lease(struct net_device **dev, unsigned int *rxq,
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enum netif_lease_dir dir);
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struct netdev_rx_queue *
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netif_get_rx_queue_lease_locked(struct net_device **dev, unsigned int *rxq);
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void netif_put_rx_queue_lease_locked(struct net_device *orig_dev,
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struct net_device *dev);
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#endif /* _LINUX_NETDEV_RX_QUEUE_H */
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