2 * This file is part of the Chelsio T4 Ethernet driver for Linux.
4 * Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved.
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 #include <linux/module.h>
36 #include <linux/netdevice.h>
41 /* Spinlock must be held by caller */
42 static int t4_sched_class_fw_cmd(struct port_info *pi,
43 struct ch_sched_params *p,
46 struct adapter *adap = pi->adapter;
47 struct sched_table *s = pi->sched_tbl;
48 struct sched_class *e;
51 e = &s->tab[p->u.params.class];
54 err = t4_sched_params(adap, p->type,
55 p->u.params.level, p->u.params.mode,
58 p->u.params.channel, e->idx,
59 p->u.params.minrate, p->u.params.maxrate,
60 p->u.params.weight, p->u.params.pktsize);
70 /* Spinlock must be held by caller */
71 static int t4_sched_bind_unbind_op(struct port_info *pi, void *arg,
72 enum sched_bind_type type, bool bind)
74 struct adapter *adap = pi->adapter;
75 u32 fw_mnem, fw_class, fw_param;
76 unsigned int pf = adap->pf;
82 struct sched_queue_entry *qe;
84 qe = (struct sched_queue_entry *)arg;
86 /* Create a template for the FW_PARAMS_CMD mnemonic and
87 * value (TX Scheduling Class in this case).
89 fw_mnem = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DMAQ) |
91 FW_PARAMS_PARAM_DMAQ_EQ_SCHEDCLASS_ETH));
92 fw_class = bind ? qe->param.class : FW_SCHED_CLS_NONE;
93 fw_param = (fw_mnem | FW_PARAMS_PARAM_YZ_V(qe->cntxt_id));
104 err = t4_set_params(adap, adap->mbox, pf, vf, 1, &fw_param, &fw_class);
110 static struct sched_class *t4_sched_queue_lookup(struct port_info *pi,
111 const unsigned int qid,
114 struct sched_table *s = pi->sched_tbl;
115 struct sched_class *e, *end;
116 struct sched_class *found = NULL;
119 /* Look for a class with matching bound queue parameters */
120 end = &s->tab[s->sched_size];
121 for (e = &s->tab[0]; e != end; ++e) {
122 struct sched_queue_entry *qe;
125 if (e->state == SCHED_STATE_UNUSED)
128 list_for_each_entry(qe, &e->queue_list, list) {
129 if (qe->cntxt_id == qid) {
145 static int t4_sched_queue_unbind(struct port_info *pi, struct ch_sched_queue *p)
147 struct adapter *adap = pi->adapter;
148 struct sched_class *e;
149 struct sched_queue_entry *qe = NULL;
150 struct sge_eth_txq *txq;
155 if (p->queue < 0 || p->queue >= pi->nqsets)
158 txq = &adap->sge.ethtxq[pi->first_qset + p->queue];
159 qid = txq->q.cntxt_id;
161 /* Find the existing class that the queue is bound to */
162 e = t4_sched_queue_lookup(pi, qid, &index);
163 if (e && index >= 0) {
167 list_for_each_entry(qe, &e->queue_list, list) {
172 err = t4_sched_bind_unbind_op(pi, (void *)qe, SCHED_QUEUE,
175 spin_unlock(&e->lock);
181 if (atomic_dec_and_test(&e->refcnt)) {
182 e->state = SCHED_STATE_UNUSED;
183 memset(&e->info, 0, sizeof(e->info));
185 spin_unlock(&e->lock);
191 static int t4_sched_queue_bind(struct port_info *pi, struct ch_sched_queue *p)
193 struct adapter *adap = pi->adapter;
194 struct sched_table *s = pi->sched_tbl;
195 struct sched_class *e;
196 struct sched_queue_entry *qe = NULL;
197 struct sge_eth_txq *txq;
201 if (p->queue < 0 || p->queue >= pi->nqsets)
204 qe = t4_alloc_mem(sizeof(struct sched_queue_entry));
208 txq = &adap->sge.ethtxq[pi->first_qset + p->queue];
209 qid = txq->q.cntxt_id;
211 /* Unbind queue from any existing class */
212 err = t4_sched_queue_unbind(pi, p);
218 /* Bind queue to specified class */
219 memset(qe, 0, sizeof(*qe));
221 memcpy(&qe->param, p, sizeof(qe->param));
223 e = &s->tab[qe->param.class];
225 err = t4_sched_bind_unbind_op(pi, (void *)qe, SCHED_QUEUE, true);
228 spin_unlock(&e->lock);
232 list_add_tail(&qe->list, &e->queue_list);
233 atomic_inc(&e->refcnt);
234 spin_unlock(&e->lock);
239 static void t4_sched_class_unbind_all(struct port_info *pi,
240 struct sched_class *e,
241 enum sched_bind_type type)
248 struct sched_queue_entry *qe;
250 list_for_each_entry(qe, &e->queue_list, list)
251 t4_sched_queue_unbind(pi, &qe->param);
259 static int t4_sched_class_bind_unbind_op(struct port_info *pi, void *arg,
260 enum sched_bind_type type, bool bind)
269 struct ch_sched_queue *qe = (struct ch_sched_queue *)arg;
272 err = t4_sched_queue_bind(pi, qe);
274 err = t4_sched_queue_unbind(pi, qe);
286 * cxgb4_sched_class_bind - Bind an entity to a scheduling class
287 * @dev: net_device pointer
288 * @arg: Entity opaque data
289 * @type: Entity type (Queue)
291 * Binds an entity (queue) to a scheduling class. If the entity
292 * is bound to another class, it will be unbound from the other class
293 * and bound to the class specified in @arg.
295 int cxgb4_sched_class_bind(struct net_device *dev, void *arg,
296 enum sched_bind_type type)
298 struct port_info *pi = netdev2pinfo(dev);
299 struct sched_table *s;
311 struct ch_sched_queue *qe = (struct ch_sched_queue *)arg;
313 class_id = qe->class;
320 if (!valid_class_id(dev, class_id))
323 if (class_id == SCHED_CLS_NONE)
327 write_lock(&s->rw_lock);
328 err = t4_sched_class_bind_unbind_op(pi, arg, type, true);
329 write_unlock(&s->rw_lock);
335 * cxgb4_sched_class_unbind - Unbind an entity from a scheduling class
336 * @dev: net_device pointer
337 * @arg: Entity opaque data
338 * @type: Entity type (Queue)
340 * Unbinds an entity (queue) from a scheduling class.
342 int cxgb4_sched_class_unbind(struct net_device *dev, void *arg,
343 enum sched_bind_type type)
345 struct port_info *pi = netdev2pinfo(dev);
346 struct sched_table *s;
358 struct ch_sched_queue *qe = (struct ch_sched_queue *)arg;
360 class_id = qe->class;
367 if (!valid_class_id(dev, class_id))
371 write_lock(&s->rw_lock);
372 err = t4_sched_class_bind_unbind_op(pi, arg, type, false);
373 write_unlock(&s->rw_lock);
378 /* If @p is NULL, fetch any available unused class */
379 static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
380 const struct ch_sched_params *p)
382 struct sched_table *s = pi->sched_tbl;
383 struct sched_class *e, *end;
384 struct sched_class *found = NULL;
387 /* Get any available unused class */
388 end = &s->tab[s->sched_size];
389 for (e = &s->tab[0]; e != end; ++e) {
390 if (e->state == SCHED_STATE_UNUSED) {
396 /* Look for a class with matching scheduling parameters */
397 struct ch_sched_params info;
398 struct ch_sched_params tp;
400 memset(&info, 0, sizeof(info));
401 memset(&tp, 0, sizeof(tp));
403 memcpy(&tp, p, sizeof(tp));
404 /* Don't try to match class parameter */
405 tp.u.params.class = SCHED_CLS_NONE;
407 end = &s->tab[s->sched_size];
408 for (e = &s->tab[0]; e != end; ++e) {
409 if (e->state == SCHED_STATE_UNUSED)
412 memset(&info, 0, sizeof(info));
413 memcpy(&info, &e->info, sizeof(info));
414 /* Don't try to match class parameter */
415 info.u.params.class = SCHED_CLS_NONE;
417 if ((info.type == tp.type) &&
418 (!memcmp(&info.u.params, &tp.u.params,
419 sizeof(info.u.params)))) {
429 static struct sched_class *t4_sched_class_alloc(struct port_info *pi,
430 struct ch_sched_params *p)
432 struct sched_table *s = pi->sched_tbl;
433 struct sched_class *e;
440 class_id = p->u.params.class;
442 /* Only accept search for existing class with matching params
443 * or allocation of new class with specified params
445 if (class_id != SCHED_CLS_NONE)
448 write_lock(&s->rw_lock);
449 /* See if there's an exisiting class with same
450 * requested sched params
452 e = t4_sched_class_lookup(pi, p);
454 struct ch_sched_params np;
456 /* Fetch any available unused class */
457 e = t4_sched_class_lookup(pi, NULL);
461 memset(&np, 0, sizeof(np));
462 memcpy(&np, p, sizeof(np));
463 np.u.params.class = e->idx;
467 err = t4_sched_class_fw_cmd(pi, &np, SCHED_FW_OP_ADD);
469 spin_unlock(&e->lock);
473 memcpy(&e->info, &np, sizeof(e->info));
474 atomic_set(&e->refcnt, 0);
475 e->state = SCHED_STATE_ACTIVE;
476 spin_unlock(&e->lock);
480 write_unlock(&s->rw_lock);
485 * cxgb4_sched_class_alloc - allocate a scheduling class
486 * @dev: net_device pointer
487 * @p: new scheduling class to create.
489 * Returns pointer to the scheduling class created. If @p is NULL, then
490 * it allocates and returns any available unused scheduling class. If a
491 * scheduling class with matching @p is found, then the matching class is
494 struct sched_class *cxgb4_sched_class_alloc(struct net_device *dev,
495 struct ch_sched_params *p)
497 struct port_info *pi = netdev2pinfo(dev);
503 class_id = p->u.params.class;
504 if (!valid_class_id(dev, class_id))
507 return t4_sched_class_alloc(pi, p);
510 static void t4_sched_class_free(struct port_info *pi, struct sched_class *e)
512 t4_sched_class_unbind_all(pi, e, SCHED_QUEUE);
515 struct sched_table *t4_init_sched(unsigned int sched_size)
517 struct sched_table *s;
520 s = t4_alloc_mem(sizeof(*s) + sched_size * sizeof(struct sched_class));
524 s->sched_size = sched_size;
525 rwlock_init(&s->rw_lock);
527 for (i = 0; i < s->sched_size; i++) {
528 memset(&s->tab[i], 0, sizeof(struct sched_class));
530 s->tab[i].state = SCHED_STATE_UNUSED;
531 INIT_LIST_HEAD(&s->tab[i].queue_list);
532 spin_lock_init(&s->tab[i].lock);
533 atomic_set(&s->tab[i].refcnt, 0);
538 void t4_cleanup_sched(struct adapter *adap)
540 struct sched_table *s;
543 for_each_port(adap, i) {
544 struct port_info *pi = netdev2pinfo(adap->port[i]);
547 for (i = 0; i < s->sched_size; i++) {
548 struct sched_class *e;
550 write_lock(&s->rw_lock);
552 if (e->state == SCHED_STATE_ACTIVE)
553 t4_sched_class_free(pi, e);
554 write_unlock(&s->rw_lock);