465 lines
11 KiB
C
465 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
|
|
|
|
#include "tsnep.h"
|
|
|
|
#include <net/pkt_sched.h>
|
|
|
|
/* save one operation at the end for additional operation at list change */
|
|
#define TSNEP_MAX_GCL_NUM (TSNEP_GCL_COUNT - 1)
|
|
|
|
static int tsnep_validate_gcl(struct tc_taprio_qopt_offload *qopt)
|
|
{
|
|
int i;
|
|
u64 cycle_time;
|
|
|
|
if (!qopt->cycle_time)
|
|
return -ERANGE;
|
|
if (qopt->num_entries > TSNEP_MAX_GCL_NUM)
|
|
return -EINVAL;
|
|
cycle_time = 0;
|
|
for (i = 0; i < qopt->num_entries; i++) {
|
|
if (qopt->entries[i].command != TC_TAPRIO_CMD_SET_GATES)
|
|
return -EINVAL;
|
|
if (qopt->entries[i].gate_mask & ~TSNEP_GCL_MASK)
|
|
return -EINVAL;
|
|
if (qopt->entries[i].interval < TSNEP_GCL_MIN_INTERVAL)
|
|
return -EINVAL;
|
|
cycle_time += qopt->entries[i].interval;
|
|
}
|
|
if (qopt->cycle_time != cycle_time)
|
|
return -EINVAL;
|
|
if (qopt->cycle_time_extension >= qopt->cycle_time)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tsnep_write_gcl_operation(struct tsnep_gcl *gcl, int index,
|
|
u32 properties, u32 interval, bool flush)
|
|
{
|
|
void __iomem *addr = gcl->addr +
|
|
sizeof(struct tsnep_gcl_operation) * index;
|
|
|
|
gcl->operation[index].properties = properties;
|
|
gcl->operation[index].interval = interval;
|
|
|
|
iowrite32(properties, addr);
|
|
iowrite32(interval, addr + sizeof(u32));
|
|
|
|
if (flush) {
|
|
/* flush write with read access */
|
|
ioread32(addr);
|
|
}
|
|
}
|
|
|
|
static u64 tsnep_change_duration(struct tsnep_gcl *gcl, int index)
|
|
{
|
|
u64 duration;
|
|
int count;
|
|
|
|
/* change needs to be triggered one or two operations before start of
|
|
* new gate control list
|
|
* - change is triggered at start of operation (minimum one operation)
|
|
* - operation with adjusted interval is inserted on demand to exactly
|
|
* meet the start of the new gate control list (optional)
|
|
*
|
|
* additionally properties are read directly after start of previous
|
|
* operation
|
|
*
|
|
* therefore, three operations needs to be considered for the limit
|
|
*/
|
|
duration = 0;
|
|
count = 3;
|
|
while (count) {
|
|
duration += gcl->operation[index].interval;
|
|
|
|
index--;
|
|
if (index < 0)
|
|
index = gcl->count - 1;
|
|
|
|
count--;
|
|
}
|
|
|
|
return duration;
|
|
}
|
|
|
|
static void tsnep_write_gcl(struct tsnep_gcl *gcl,
|
|
struct tc_taprio_qopt_offload *qopt)
|
|
{
|
|
int i;
|
|
u32 properties;
|
|
u64 extend;
|
|
u64 cut;
|
|
|
|
gcl->base_time = ktime_to_ns(qopt->base_time);
|
|
gcl->cycle_time = qopt->cycle_time;
|
|
gcl->cycle_time_extension = qopt->cycle_time_extension;
|
|
|
|
for (i = 0; i < qopt->num_entries; i++) {
|
|
properties = qopt->entries[i].gate_mask;
|
|
if (i == (qopt->num_entries - 1))
|
|
properties |= TSNEP_GCL_LAST;
|
|
|
|
tsnep_write_gcl_operation(gcl, i, properties,
|
|
qopt->entries[i].interval, true);
|
|
}
|
|
gcl->count = qopt->num_entries;
|
|
|
|
/* calculate change limit; i.e., the time needed between enable and
|
|
* start of new gate control list
|
|
*/
|
|
|
|
/* case 1: extend cycle time for change
|
|
* - change duration of last operation
|
|
* - cycle time extension
|
|
*/
|
|
extend = tsnep_change_duration(gcl, gcl->count - 1);
|
|
extend += gcl->cycle_time_extension;
|
|
|
|
/* case 2: cut cycle time for change
|
|
* - maximum change duration
|
|
*/
|
|
cut = 0;
|
|
for (i = 0; i < gcl->count; i++)
|
|
cut = max(cut, tsnep_change_duration(gcl, i));
|
|
|
|
/* use maximum, because the actual case (extend or cut) can be
|
|
* determined only after limit is known (chicken-and-egg problem)
|
|
*/
|
|
gcl->change_limit = max(extend, cut);
|
|
}
|
|
|
|
static u64 tsnep_gcl_start_after(struct tsnep_gcl *gcl, u64 limit)
|
|
{
|
|
u64 start = gcl->base_time;
|
|
u64 n;
|
|
|
|
if (start <= limit) {
|
|
n = div64_u64(limit - start, gcl->cycle_time);
|
|
start += (n + 1) * gcl->cycle_time;
|
|
}
|
|
|
|
return start;
|
|
}
|
|
|
|
static u64 tsnep_gcl_start_before(struct tsnep_gcl *gcl, u64 limit)
|
|
{
|
|
u64 start = gcl->base_time;
|
|
u64 n;
|
|
|
|
n = div64_u64(limit - start, gcl->cycle_time);
|
|
start += n * gcl->cycle_time;
|
|
if (start == limit)
|
|
start -= gcl->cycle_time;
|
|
|
|
return start;
|
|
}
|
|
|
|
static u64 tsnep_set_gcl_change(struct tsnep_gcl *gcl, int index, u64 change,
|
|
bool insert)
|
|
{
|
|
/* previous operation triggers change and properties are evaluated at
|
|
* start of operation
|
|
*/
|
|
if (index == 0)
|
|
index = gcl->count - 1;
|
|
else
|
|
index = index - 1;
|
|
change -= gcl->operation[index].interval;
|
|
|
|
/* optionally change to new list with additional operation in between */
|
|
if (insert) {
|
|
void __iomem *addr = gcl->addr +
|
|
sizeof(struct tsnep_gcl_operation) * index;
|
|
|
|
gcl->operation[index].properties |= TSNEP_GCL_INSERT;
|
|
iowrite32(gcl->operation[index].properties, addr);
|
|
}
|
|
|
|
return change;
|
|
}
|
|
|
|
static void tsnep_clean_gcl(struct tsnep_gcl *gcl)
|
|
{
|
|
int i;
|
|
u32 mask = TSNEP_GCL_LAST | TSNEP_GCL_MASK;
|
|
void __iomem *addr;
|
|
|
|
/* search for insert operation and reset properties */
|
|
for (i = 0; i < gcl->count; i++) {
|
|
if (gcl->operation[i].properties & ~mask) {
|
|
addr = gcl->addr +
|
|
sizeof(struct tsnep_gcl_operation) * i;
|
|
|
|
gcl->operation[i].properties &= mask;
|
|
iowrite32(gcl->operation[i].properties, addr);
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static u64 tsnep_insert_gcl_operation(struct tsnep_gcl *gcl, int ref,
|
|
u64 change, u32 interval)
|
|
{
|
|
u32 properties;
|
|
|
|
properties = gcl->operation[ref].properties & TSNEP_GCL_MASK;
|
|
/* change to new list directly after inserted operation */
|
|
properties |= TSNEP_GCL_CHANGE;
|
|
|
|
/* last operation of list is reserved to insert operation */
|
|
tsnep_write_gcl_operation(gcl, TSNEP_GCL_COUNT - 1, properties,
|
|
interval, false);
|
|
|
|
return tsnep_set_gcl_change(gcl, ref, change, true);
|
|
}
|
|
|
|
static u64 tsnep_extend_gcl(struct tsnep_gcl *gcl, u64 start, u32 extension)
|
|
{
|
|
int ref = gcl->count - 1;
|
|
u32 interval = gcl->operation[ref].interval + extension;
|
|
|
|
start -= gcl->operation[ref].interval;
|
|
|
|
return tsnep_insert_gcl_operation(gcl, ref, start, interval);
|
|
}
|
|
|
|
static u64 tsnep_cut_gcl(struct tsnep_gcl *gcl, u64 start, u64 cycle_time)
|
|
{
|
|
u64 sum = 0;
|
|
int i;
|
|
|
|
/* find operation which shall be cutted */
|
|
for (i = 0; i < gcl->count; i++) {
|
|
u64 sum_tmp = sum + gcl->operation[i].interval;
|
|
u64 interval;
|
|
|
|
/* sum up operations as long as cycle time is not exceeded */
|
|
if (sum_tmp > cycle_time)
|
|
break;
|
|
|
|
/* remaining interval must be big enough for hardware */
|
|
interval = cycle_time - sum_tmp;
|
|
if (interval > 0 && interval < TSNEP_GCL_MIN_INTERVAL)
|
|
break;
|
|
|
|
sum = sum_tmp;
|
|
}
|
|
if (sum == cycle_time) {
|
|
/* no need to cut operation itself or whole cycle
|
|
* => change exactly at operation
|
|
*/
|
|
return tsnep_set_gcl_change(gcl, i, start + sum, false);
|
|
}
|
|
return tsnep_insert_gcl_operation(gcl, i, start + sum,
|
|
cycle_time - sum);
|
|
}
|
|
|
|
static int tsnep_enable_gcl(struct tsnep_adapter *adapter,
|
|
struct tsnep_gcl *gcl, struct tsnep_gcl *curr)
|
|
{
|
|
u64 system_time;
|
|
u64 timeout;
|
|
u64 limit;
|
|
|
|
/* estimate timeout limit after timeout enable, actually timeout limit
|
|
* in hardware will be earlier than estimate so we are on the safe side
|
|
*/
|
|
tsnep_get_system_time(adapter, &system_time);
|
|
timeout = system_time + TSNEP_GC_TIMEOUT;
|
|
|
|
if (curr)
|
|
limit = timeout + curr->change_limit;
|
|
else
|
|
limit = timeout;
|
|
|
|
gcl->start_time = tsnep_gcl_start_after(gcl, limit);
|
|
|
|
/* gate control time register is only 32bit => time shall be in the near
|
|
* future (no driver support for far future implemented)
|
|
*/
|
|
if ((gcl->start_time - system_time) >= U32_MAX)
|
|
return -EAGAIN;
|
|
|
|
if (curr) {
|
|
/* change gate control list */
|
|
u64 last;
|
|
u64 change;
|
|
|
|
last = tsnep_gcl_start_before(curr, gcl->start_time);
|
|
if ((last + curr->cycle_time) == gcl->start_time)
|
|
change = tsnep_cut_gcl(curr, last,
|
|
gcl->start_time - last);
|
|
else if (((gcl->start_time - last) <=
|
|
curr->cycle_time_extension) ||
|
|
((gcl->start_time - last) <= TSNEP_GCL_MIN_INTERVAL))
|
|
change = tsnep_extend_gcl(curr, last,
|
|
gcl->start_time - last);
|
|
else
|
|
change = tsnep_cut_gcl(curr, last,
|
|
gcl->start_time - last);
|
|
|
|
WARN_ON(change <= timeout);
|
|
gcl->change = true;
|
|
iowrite32(change & 0xFFFFFFFF, adapter->addr + TSNEP_GC_CHANGE);
|
|
} else {
|
|
/* start gate control list */
|
|
WARN_ON(gcl->start_time <= timeout);
|
|
gcl->change = false;
|
|
iowrite32(gcl->start_time & 0xFFFFFFFF,
|
|
adapter->addr + TSNEP_GC_TIME);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tsnep_taprio(struct tsnep_adapter *adapter,
|
|
struct tc_taprio_qopt_offload *qopt)
|
|
{
|
|
struct tsnep_gcl *gcl;
|
|
struct tsnep_gcl *curr;
|
|
int retval;
|
|
|
|
if (!adapter->gate_control)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!qopt->enable) {
|
|
/* disable gate control if active */
|
|
mutex_lock(&adapter->gate_control_lock);
|
|
|
|
if (adapter->gate_control_active) {
|
|
iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
|
|
adapter->gate_control_active = false;
|
|
}
|
|
|
|
mutex_unlock(&adapter->gate_control_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
retval = tsnep_validate_gcl(qopt);
|
|
if (retval)
|
|
return retval;
|
|
|
|
mutex_lock(&adapter->gate_control_lock);
|
|
|
|
gcl = &adapter->gcl[adapter->next_gcl];
|
|
tsnep_write_gcl(gcl, qopt);
|
|
|
|
/* select current gate control list if active */
|
|
if (adapter->gate_control_active) {
|
|
if (adapter->next_gcl == 0)
|
|
curr = &adapter->gcl[1];
|
|
else
|
|
curr = &adapter->gcl[0];
|
|
} else {
|
|
curr = NULL;
|
|
}
|
|
|
|
for (;;) {
|
|
/* start timeout which discards late enable, this helps ensuring
|
|
* that start/change time are in the future at enable
|
|
*/
|
|
iowrite8(TSNEP_GC_ENABLE_TIMEOUT, adapter->addr + TSNEP_GC);
|
|
|
|
retval = tsnep_enable_gcl(adapter, gcl, curr);
|
|
if (retval) {
|
|
mutex_unlock(&adapter->gate_control_lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* enable gate control list */
|
|
if (adapter->next_gcl == 0)
|
|
iowrite8(TSNEP_GC_ENABLE_A, adapter->addr + TSNEP_GC);
|
|
else
|
|
iowrite8(TSNEP_GC_ENABLE_B, adapter->addr + TSNEP_GC);
|
|
|
|
/* done if timeout did not happen */
|
|
if (!(ioread32(adapter->addr + TSNEP_GC) &
|
|
TSNEP_GC_TIMEOUT_SIGNAL))
|
|
break;
|
|
|
|
/* timeout is acknowledged with any enable */
|
|
iowrite8(TSNEP_GC_ENABLE_A, adapter->addr + TSNEP_GC);
|
|
|
|
if (curr)
|
|
tsnep_clean_gcl(curr);
|
|
|
|
/* retry because of timeout */
|
|
}
|
|
|
|
adapter->gate_control_active = true;
|
|
|
|
if (adapter->next_gcl == 0)
|
|
adapter->next_gcl = 1;
|
|
else
|
|
adapter->next_gcl = 0;
|
|
|
|
mutex_unlock(&adapter->gate_control_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tsnep_tc_query_caps(struct tsnep_adapter *adapter,
|
|
struct tc_query_caps_base *base)
|
|
{
|
|
switch (base->type) {
|
|
case TC_SETUP_QDISC_TAPRIO: {
|
|
struct tc_taprio_caps *caps = base->caps;
|
|
|
|
if (!adapter->gate_control)
|
|
return -EOPNOTSUPP;
|
|
|
|
caps->gate_mask_per_txq = true;
|
|
|
|
return 0;
|
|
}
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
int tsnep_tc_setup(struct net_device *netdev, enum tc_setup_type type,
|
|
void *type_data)
|
|
{
|
|
struct tsnep_adapter *adapter = netdev_priv(netdev);
|
|
|
|
switch (type) {
|
|
case TC_QUERY_CAPS:
|
|
return tsnep_tc_query_caps(adapter, type_data);
|
|
case TC_SETUP_QDISC_TAPRIO:
|
|
return tsnep_taprio(adapter, type_data);
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
int tsnep_tc_init(struct tsnep_adapter *adapter)
|
|
{
|
|
if (!adapter->gate_control)
|
|
return 0;
|
|
|
|
/* open all gates */
|
|
iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
|
|
iowrite32(TSNEP_GC_OPEN | TSNEP_GC_NEXT_OPEN, adapter->addr + TSNEP_GC);
|
|
|
|
adapter->gcl[0].addr = adapter->addr + TSNEP_GCL_A;
|
|
adapter->gcl[1].addr = adapter->addr + TSNEP_GCL_B;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void tsnep_tc_cleanup(struct tsnep_adapter *adapter)
|
|
{
|
|
if (!adapter->gate_control)
|
|
return;
|
|
|
|
if (adapter->gate_control_active) {
|
|
iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
|
|
adapter->gate_control_active = false;
|
|
}
|
|
}
|