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/*
* This file is part of the Chelsio T4 Ethernet driver for Linux.
*
* Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/module.h>
#include <linux/netdevice.h>
#include "cxgb4.h"
#include "sched.h"
/* Spinlock must be held by caller */
static int t4_sched_class_fw_cmd(struct port_info *pi,
struct ch_sched_params *p,
enum sched_fw_ops op)
{
struct adapter *adap = pi->adapter;
struct sched_table *s = pi->sched_tbl;
struct sched_class *e;
int err = 0;
e = &s->tab[p->u.params.class];
switch (op) {
case SCHED_FW_OP_ADD:
err = t4_sched_params(adap, p->type,
p->u.params.level, p->u.params.mode,
p->u.params.rateunit,
p->u.params.ratemode,
p->u.params.channel, e->idx,
p->u.params.minrate, p->u.params.maxrate,
p->u.params.weight, p->u.params.pktsize);
break;
default:
err = -ENOTSUPP;
break;
}
return err;
}
/* If @p is NULL, fetch any available unused class */
static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
const struct ch_sched_params *p)
{
struct sched_table *s = pi->sched_tbl;
struct sched_class *e, *end;
struct sched_class *found = NULL;
if (!p) {
/* Get any available unused class */
end = &s->tab[s->sched_size];
for (e = &s->tab[0]; e != end; ++e) {
if (e->state == SCHED_STATE_UNUSED) {
found = e;
break;
}
}
} else {
/* Look for a class with matching scheduling parameters */
struct ch_sched_params info;
struct ch_sched_params tp;
memset(&info, 0, sizeof(info));
memset(&tp, 0, sizeof(tp));
memcpy(&tp, p, sizeof(tp));
/* Don't try to match class parameter */
tp.u.params.class = SCHED_CLS_NONE;
end = &s->tab[s->sched_size];
for (e = &s->tab[0]; e != end; ++e) {
if (e->state == SCHED_STATE_UNUSED)
continue;
memset(&info, 0, sizeof(info));
memcpy(&info, &e->info, sizeof(info));
/* Don't try to match class parameter */
info.u.params.class = SCHED_CLS_NONE;
if ((info.type == tp.type) &&
(!memcmp(&info.u.params, &tp.u.params,
sizeof(info.u.params)))) {
found = e;
break;
}
}
}
return found;
}
static struct sched_class *t4_sched_class_alloc(struct port_info *pi,
struct ch_sched_params *p)
{
struct sched_table *s = pi->sched_tbl;
struct sched_class *e;
u8 class_id;
int err;
if (!p)
return NULL;
class_id = p->u.params.class;
/* Only accept search for existing class with matching params
* or allocation of new class with specified params
*/
if (class_id != SCHED_CLS_NONE)
return NULL;
write_lock(&s->rw_lock);
/* See if there's an exisiting class with same
* requested sched params
*/
e = t4_sched_class_lookup(pi, p);
if (!e) {
struct ch_sched_params np;
/* Fetch any available unused class */
e = t4_sched_class_lookup(pi, NULL);
if (!e)
goto out;
memset(&np, 0, sizeof(np));
memcpy(&np, p, sizeof(np));
np.u.params.class = e->idx;
spin_lock(&e->lock);
/* New class */
err = t4_sched_class_fw_cmd(pi, &np, SCHED_FW_OP_ADD);
if (err) {
spin_unlock(&e->lock);
e = NULL;
goto out;
}
memcpy(&e->info, &np, sizeof(e->info));
atomic_set(&e->refcnt, 0);
e->state = SCHED_STATE_ACTIVE;
spin_unlock(&e->lock);
}
out:
write_unlock(&s->rw_lock);
return e;
}
/**
* cxgb4_sched_class_alloc - allocate a scheduling class
* @dev: net_device pointer
* @p: new scheduling class to create.
*
* Returns pointer to the scheduling class created. If @p is NULL, then
* it allocates and returns any available unused scheduling class. If a
* scheduling class with matching @p is found, then the matching class is
* returned.
*/
struct sched_class *cxgb4_sched_class_alloc(struct net_device *dev,
struct ch_sched_params *p)
{
struct port_info *pi = netdev2pinfo(dev);
u8 class_id;
if (!can_sched(dev))
return NULL;
class_id = p->u.params.class;
if (!valid_class_id(dev, class_id))
return NULL;
return t4_sched_class_alloc(pi, p);
}
struct sched_table *t4_init_sched(unsigned int sched_size)
{
struct sched_table *s;
unsigned int i;
s = t4_alloc_mem(sizeof(*s) + sched_size * sizeof(struct sched_class));
if (!s)
return NULL;
s->sched_size = sched_size;
rwlock_init(&s->rw_lock);
for (i = 0; i < s->sched_size; i++) {
memset(&s->tab[i], 0, sizeof(struct sched_class));
s->tab[i].idx = i;
s->tab[i].state = SCHED_STATE_UNUSED;
spin_lock_init(&s->tab[i].lock);
atomic_set(&s->tab[i].refcnt, 0);
}
return s;
}
void t4_cleanup_sched(struct adapter *adap)
{
struct sched_table *s;
unsigned int i;
for_each_port(adap, i) {
struct port_info *pi = netdev2pinfo(adap->port[i]);
s = pi->sched_tbl;
t4_free_mem(s);
}
}
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