133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
|
|
#include <linux/net.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/netlink.h>
|
|
#include <linux/types.h>
|
|
#include <net/pkt_sched.h>
|
|
|
|
#include "sch_mqprio_lib.h"
|
|
|
|
/* Returns true if the intervals [a, b) and [c, d) overlap. */
|
|
static bool intervals_overlap(int a, int b, int c, int d)
|
|
{
|
|
int left = max(a, c), right = min(b, d);
|
|
|
|
return left < right;
|
|
}
|
|
|
|
static int mqprio_validate_queue_counts(struct net_device *dev,
|
|
const struct tc_mqprio_qopt *qopt,
|
|
bool allow_overlapping_txqs,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int i, j;
|
|
|
|
for (i = 0; i < qopt->num_tc; i++) {
|
|
unsigned int last = qopt->offset[i] + qopt->count[i];
|
|
|
|
if (!qopt->count[i]) {
|
|
NL_SET_ERR_MSG_FMT_MOD(extack, "No queues for TC %d",
|
|
i);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Verify the queue count is in tx range being equal to the
|
|
* real_num_tx_queues indicates the last queue is in use.
|
|
*/
|
|
if (qopt->offset[i] >= dev->real_num_tx_queues ||
|
|
last > dev->real_num_tx_queues) {
|
|
NL_SET_ERR_MSG_FMT_MOD(extack,
|
|
"Queues %d:%d for TC %d exceed the %d TX queues available",
|
|
qopt->count[i], qopt->offset[i],
|
|
i, dev->real_num_tx_queues);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (allow_overlapping_txqs)
|
|
continue;
|
|
|
|
/* Verify that the offset and counts do not overlap */
|
|
for (j = i + 1; j < qopt->num_tc; j++) {
|
|
if (intervals_overlap(qopt->offset[i], last,
|
|
qopt->offset[j],
|
|
qopt->offset[j] +
|
|
qopt->count[j])) {
|
|
NL_SET_ERR_MSG_FMT_MOD(extack,
|
|
"TC %d queues %d@%d overlap with TC %d queues %d@%d",
|
|
i, qopt->count[i], qopt->offset[i],
|
|
j, qopt->count[j], qopt->offset[j]);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mqprio_validate_qopt(struct net_device *dev, struct tc_mqprio_qopt *qopt,
|
|
bool validate_queue_counts,
|
|
bool allow_overlapping_txqs,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int i, err;
|
|
|
|
/* Verify num_tc is not out of max range */
|
|
if (qopt->num_tc > TC_MAX_QUEUE) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Number of traffic classes is outside valid range");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Verify priority mapping uses valid tcs */
|
|
for (i = 0; i <= TC_BITMASK; i++) {
|
|
if (qopt->prio_tc_map[i] >= qopt->num_tc) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Invalid traffic class in priority to traffic class mapping");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (validate_queue_counts) {
|
|
err = mqprio_validate_queue_counts(dev, qopt,
|
|
allow_overlapping_txqs,
|
|
extack);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mqprio_validate_qopt);
|
|
|
|
void mqprio_qopt_reconstruct(struct net_device *dev, struct tc_mqprio_qopt *qopt)
|
|
{
|
|
int tc, num_tc = netdev_get_num_tc(dev);
|
|
|
|
qopt->num_tc = num_tc;
|
|
memcpy(qopt->prio_tc_map, dev->prio_tc_map, sizeof(qopt->prio_tc_map));
|
|
|
|
for (tc = 0; tc < num_tc; tc++) {
|
|
qopt->count[tc] = dev->tc_to_txq[tc].count;
|
|
qopt->offset[tc] = dev->tc_to_txq[tc].offset;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(mqprio_qopt_reconstruct);
|
|
|
|
void mqprio_fp_to_offload(u32 fp[TC_QOPT_MAX_QUEUE],
|
|
struct tc_mqprio_qopt_offload *mqprio)
|
|
{
|
|
unsigned long preemptible_tcs = 0;
|
|
int tc;
|
|
|
|
for (tc = 0; tc < TC_QOPT_MAX_QUEUE; tc++)
|
|
if (fp[tc] == TC_FP_PREEMPTIBLE)
|
|
preemptible_tcs |= BIT(tc);
|
|
|
|
mqprio->preemptible_tcs = preemptible_tcs;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mqprio_fp_to_offload);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Shared mqprio qdisc code currently between taprio and mqprio");
|