mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 06:44:00 -04:00
d04686d9bc
Implement netdev_nl_queue_create_doit which creates a new rx queue in a
virtual netdev and then leases it to a rx queue in a physical netdev.
Example with ynl client:
# ynl --family netdev --output-json --do queue-create \
--json '{"ifindex": 8, "type": "rx", "lease": {"ifindex": 4, "queue": {"type": "rx", "id": 15}}}'
{'id': 1}
Note that the netdevice locking order is always from the virtual to
the physical device.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Co-developed-by: David Wei <dw@davidwei.uk>
Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20260402231031.447597-3-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
#include <net/netdev_queues.h>
|
|
#include <net/netdev_rx_queue.h>
|
|
#include <net/xdp_sock_drv.h>
|
|
|
|
#include "dev.h"
|
|
|
|
/**
|
|
* 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.
|
|
* 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;
|
|
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;
|
|
}
|
|
|
|
bool netdev_can_create_queue(const struct net_device *dev,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (dev->dev.parent) {
|
|
NL_SET_ERR_MSG(extack, "Device is not a virtual device");
|
|
return false;
|
|
}
|
|
if (!dev->queue_mgmt_ops ||
|
|
!dev->queue_mgmt_ops->ndo_queue_create) {
|
|
NL_SET_ERR_MSG(extack, "Device does not support queue creation");
|
|
return false;
|
|
}
|
|
if (dev->real_num_rx_queues < 1 ||
|
|
dev->real_num_tx_queues < 1) {
|
|
NL_SET_ERR_MSG(extack, "Device must have at least one real queue");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool netdev_can_lease_queue(const struct net_device *dev,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (!dev->dev.parent) {
|
|
NL_SET_ERR_MSG(extack, "Lease device is a virtual device");
|
|
return false;
|
|
}
|
|
if (!netif_device_present(dev)) {
|
|
NL_SET_ERR_MSG(extack, "Lease device has been removed from the system");
|
|
return false;
|
|
}
|
|
if (!dev->queue_mgmt_ops) {
|
|
NL_SET_ERR_MSG(extack, "Lease device does not support queue management operations");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool netdev_queue_busy(struct net_device *dev, unsigned int idx,
|
|
enum netdev_queue_type type,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (xsk_get_pool_from_qid(dev, idx)) {
|
|
NL_SET_ERR_MSG(extack, "Device queue in use by AF_XDP");
|
|
return true;
|
|
}
|
|
if (type == NETDEV_QUEUE_TYPE_TX)
|
|
return false;
|
|
if (netif_rxq_is_leased(dev, idx)) {
|
|
NL_SET_ERR_MSG(extack, "Device queue in use due to queue leasing");
|
|
return true;
|
|
}
|
|
if (netif_rxq_has_mp(dev, idx)) {
|
|
NL_SET_ERR_MSG(extack, "Device queue in use by memory provider");
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|