tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/netdevice.h>
4#include <net/netdev_queues.h>
5#include <net/netdev_rx_queue.h>
6
7#include "dev.h"
8
9static int netdev_nop_validate_qcfg(struct net_device *dev,
10 struct netdev_queue_config *qcfg,
11 struct netlink_ext_ack *extack)
12{
13 return 0;
14}
15
16static int __netdev_queue_config(struct net_device *dev, int rxq_idx,
17 struct netdev_queue_config *qcfg,
18 struct netlink_ext_ack *extack,
19 bool validate)
20{
21 int (*validate_cb)(struct net_device *dev,
22 struct netdev_queue_config *qcfg,
23 struct netlink_ext_ack *extack);
24 struct pp_memory_provider_params *mpp;
25 int err;
26
27 validate_cb = netdev_nop_validate_qcfg;
28 if (validate && dev->queue_mgmt_ops->ndo_validate_qcfg)
29 validate_cb = dev->queue_mgmt_ops->ndo_validate_qcfg;
30
31 memset(qcfg, 0, sizeof(*qcfg));
32
33 /* Get defaults from the driver, in case user config not set */
34 if (dev->queue_mgmt_ops->ndo_default_qcfg)
35 dev->queue_mgmt_ops->ndo_default_qcfg(dev, qcfg);
36 err = validate_cb(dev, qcfg, extack);
37 if (err)
38 return err;
39
40 /* Apply MP overrides */
41 mpp = &__netif_get_rx_queue(dev, rxq_idx)->mp_params;
42 if (mpp->rx_page_size)
43 qcfg->rx_page_size = mpp->rx_page_size;
44 err = validate_cb(dev, qcfg, extack);
45 if (err)
46 return err;
47
48 return 0;
49}
50
51/**
52 * netdev_queue_config() - get configuration for a given queue
53 * @dev: net_device instance
54 * @rxq_idx: index of the queue of interest
55 * @qcfg: queue configuration struct (output)
56 *
57 * Render the configuration for a given queue. This helper should be used
58 * by drivers which support queue configuration to retrieve config for
59 * a particular queue.
60 *
61 * @qcfg is an output parameter and is always fully initialized by this
62 * function. Some values may not be set by the user, drivers may either
63 * deal with the "unset" values in @qcfg, or provide the callback
64 * to populate defaults in queue_management_ops.
65 */
66void netdev_queue_config(struct net_device *dev, int rxq_idx,
67 struct netdev_queue_config *qcfg)
68{
69 __netdev_queue_config(dev, rxq_idx, qcfg, NULL, false);
70}
71EXPORT_SYMBOL(netdev_queue_config);
72
73int netdev_queue_config_validate(struct net_device *dev, int rxq_idx,
74 struct netdev_queue_config *qcfg,
75 struct netlink_ext_ack *extack)
76{
77 return __netdev_queue_config(dev, rxq_idx, qcfg, extack, true);
78}