drivers/net/ethernet/chelsio/cxgb4/sched.h

   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 };
  56
  57 enum sched_bind_type {
  58         SCHED_QUEUE,
  59 };
  60
  61 struct sched_queue_entry {
  62         struct list_head list;
  63         unsigned int cntxt_id;
  64         struct ch_sched_queue param;
  65 };
  66
  67 struct sched_class {
  68         u8 state;
  69         u8 idx;
  70         struct ch_sched_params info;
  71         struct list_head queue_list;
  72         spinlock_t lock; /* Per class lock */
  73         atomic_t refcnt;
  74 };
  75
  76 struct sched_table {      /* per port scheduling table */
  77         u8 sched_size;
  78         rwlock_t rw_lock; /* Table lock */
  79         struct sched_class tab[0];
  80 };
  81
  82 static inline bool can_sched(struct net_device *dev)
  83 {
  84         struct port_info *pi = netdev2pinfo(dev);
  85
  86         return !pi->sched_tbl ? false : true;
  87 }
  88
  89 static inline bool valid_class_id(struct net_device *dev, u8 class_id)
  90 {
  91         struct port_info *pi = netdev2pinfo(dev);
  92
  93         if ((class_id > pi->sched_tbl->sched_size - 1) &&
  94             (class_id != SCHED_CLS_NONE))
  95                 return false;
  96
  97         return true;
  98 }
  99
 100 int cxgb4_sched_class_bind(struct net_device *dev, void *arg,
 101                            enum sched_bind_type type);
 102 int cxgb4_sched_class_unbind(struct net_device *dev, void *arg,
 103                              enum sched_bind_type type);
 104
 105 struct sched_class *cxgb4_sched_class_alloc(struct net_device *dev,
 106                                             struct ch_sched_params *p);
 107
 108 struct sched_table *t4_init_sched(unsigned int size);
 109 void t4_cleanup_sched(struct adapter *adap);
 110 #endif  /* __CXGB4_SCHED_H */