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804bf334d0
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 <dw@davidwei.uk> Co-developed-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Stanislav Fomichev <sdf@fomichev.me> Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org> Link: https://patch.msgid.link/20260115082603.219152-7-daniel@iogearbox.net Signed-off-by: Paolo Abeni <pabeni@redhat.com>
98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <net/netdev_queues.h>
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#include <net/netdev_rx_queue.h>
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#include <net/xdp_sock_drv.h>
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/**
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* netdev_queue_get_dma_dev() - get dma device for zero-copy operations
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* @dev: net_device
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* @idx: queue index
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*
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* Get dma device for zero-copy operations to be used for this queue. If the
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* queue is leased to a physical queue, we retrieve the latter's dma device.
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* When such device is not available or valid, the function will return NULL.
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*
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* Return: Device or NULL on error
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*/
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struct device *netdev_queue_get_dma_dev(struct net_device *dev, int idx)
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{
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const struct netdev_queue_mgmt_ops *queue_ops;
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struct device *dma_dev;
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if (idx < dev->real_num_rx_queues) {
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struct netdev_rx_queue *rxq = __netif_get_rx_queue(dev, idx);
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if (rxq->lease) {
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rxq = rxq->lease;
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dev = rxq->dev;
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idx = get_netdev_rx_queue_index(rxq);
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}
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}
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queue_ops = dev->queue_mgmt_ops;
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if (queue_ops && queue_ops->ndo_queue_get_dma_dev)
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dma_dev = queue_ops->ndo_queue_get_dma_dev(dev, idx);
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else
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dma_dev = dev->dev.parent;
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return dma_dev && dma_dev->dma_mask ? dma_dev : NULL;
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}
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bool netdev_can_create_queue(const struct net_device *dev,
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struct netlink_ext_ack *extack)
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{
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if (dev->dev.parent) {
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NL_SET_ERR_MSG(extack, "Device is not a virtual device");
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return false;
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}
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if (!dev->queue_mgmt_ops ||
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!dev->queue_mgmt_ops->ndo_queue_create) {
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NL_SET_ERR_MSG(extack, "Device does not support queue creation");
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return false;
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}
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if (dev->real_num_rx_queues < 1 ||
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dev->real_num_tx_queues < 1) {
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NL_SET_ERR_MSG(extack, "Device must have at least one real queue");
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return false;
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}
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return true;
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}
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bool netdev_can_lease_queue(const struct net_device *dev,
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struct netlink_ext_ack *extack)
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{
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if (!dev->dev.parent) {
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NL_SET_ERR_MSG(extack, "Lease device is a virtual device");
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return false;
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}
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if (!netif_device_present(dev)) {
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NL_SET_ERR_MSG(extack, "Lease device has been removed from the system");
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return false;
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}
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if (!dev->queue_mgmt_ops) {
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NL_SET_ERR_MSG(extack, "Lease device does not support queue management operations");
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return false;
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}
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return true;
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}
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bool netdev_queue_busy(struct net_device *dev, int idx,
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struct netlink_ext_ack *extack)
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{
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if (netif_rxq_is_leased(dev, idx)) {
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NL_SET_ERR_MSG(extack, "Lease device queue is already leased");
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return true;
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}
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if (xsk_get_pool_from_qid(dev, idx)) {
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NL_SET_ERR_MSG(extack, "Lease device queue in use by AF_XDP");
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return true;
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}
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if (netif_rxq_has_mp(dev, idx)) {
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NL_SET_ERR_MSG(extack, "Lease device queue in use by memory provider");
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return true;
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}
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return false;
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}
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