1 /*
2  * This file is part of the Chelsio T4 Ethernet driver for Linux.
3  *
4  * Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved.
5  *
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:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
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.
24  *
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
32  * SOFTWARE.
33  */
34 
35 #ifndef __CXGB4_SCHED_H
36 #define __CXGB4_SCHED_H
37 
38 #include <linux/spinlock.h>
39 #include <linux/atomic.h>
40 
41 #define SCHED_CLS_NONE 0xff
42 
43 #define FW_SCHED_CLS_NONE 0xffffffff
44 
45 /* Max rate that can be set to a scheduling class is 100 Gbps */
46 #define SCHED_MAX_RATE_KBPS 100000000U
47 
48 enum {
49 	SCHED_STATE_ACTIVE,
50 	SCHED_STATE_UNUSED,
51 };
52 
53 enum sched_fw_ops {
54 	SCHED_FW_OP_ADD,
55 	SCHED_FW_OP_DEL,
56 };
57 
58 enum sched_bind_type {
59 	SCHED_QUEUE,
60 	SCHED_FLOWC,
61 };
62 
63 struct sched_queue_entry {
64 	struct list_head list;
65 	unsigned int cntxt_id;
66 	struct ch_sched_queue param;
67 };
68 
69 struct sched_flowc_entry {
70 	struct list_head list;
71 	struct ch_sched_flowc param;
72 };
73 
74 struct sched_class {
75 	u8 state;
76 	u8 idx;
77 	struct ch_sched_params info;
78 	enum sched_bind_type bind_type;
79 	struct list_head entry_list;
80 	atomic_t refcnt;
81 };
82 
83 struct sched_table {      /* per port scheduling table */
84 	u8 sched_size;
85 	struct sched_class tab[0];
86 };
87 
88 static inline bool can_sched(struct net_device *dev)
89 {
90 	struct port_info *pi = netdev2pinfo(dev);
91 
92 	return !pi->sched_tbl ? false : true;
93 }
94 
95 static inline bool valid_class_id(struct net_device *dev, u8 class_id)
96 {
97 	struct port_info *pi = netdev2pinfo(dev);
98 
99 	if ((class_id > pi->sched_tbl->sched_size - 1) &&
100 	    (class_id != SCHED_CLS_NONE))
101 		return false;
102 
103 	return true;
104 }
105 
106 struct sched_class *cxgb4_sched_queue_lookup(struct net_device *dev,
107 					     struct ch_sched_queue *p);
108 int cxgb4_sched_class_bind(struct net_device *dev, void *arg,
109 			   enum sched_bind_type type);
110 int cxgb4_sched_class_unbind(struct net_device *dev, void *arg,
111 			     enum sched_bind_type type);
112 
113 struct sched_class *cxgb4_sched_class_alloc(struct net_device *dev,
114 					    struct ch_sched_params *p);
115 void cxgb4_sched_class_free(struct net_device *dev, u8 classid);
116 
117 struct sched_table *t4_init_sched(unsigned int size);
118 void t4_cleanup_sched(struct adapter *adap);
119 #endif  /* __CXGB4_SCHED_H */
120