Rahul Lakkireddy | b72a32d | 2016-08-22 16:29:06 +0530 | [diff] [blame^] | 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 | #include <linux/module.h> |
| 36 | #include <linux/netdevice.h> |
| 37 | |
| 38 | #include "cxgb4.h" |
| 39 | #include "sched.h" |
| 40 | |
| 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, |
| 44 | enum sched_fw_ops op) |
| 45 | { |
| 46 | struct adapter *adap = pi->adapter; |
| 47 | struct sched_table *s = pi->sched_tbl; |
| 48 | struct sched_class *e; |
| 49 | int err = 0; |
| 50 | |
| 51 | e = &s->tab[p->u.params.class]; |
| 52 | switch (op) { |
| 53 | case SCHED_FW_OP_ADD: |
| 54 | err = t4_sched_params(adap, p->type, |
| 55 | p->u.params.level, p->u.params.mode, |
| 56 | p->u.params.rateunit, |
| 57 | p->u.params.ratemode, |
| 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); |
| 61 | break; |
| 62 | default: |
| 63 | err = -ENOTSUPP; |
| 64 | break; |
| 65 | } |
| 66 | |
| 67 | return err; |
| 68 | } |
| 69 | |
| 70 | /* If @p is NULL, fetch any available unused class */ |
| 71 | static struct sched_class *t4_sched_class_lookup(struct port_info *pi, |
| 72 | const struct ch_sched_params *p) |
| 73 | { |
| 74 | struct sched_table *s = pi->sched_tbl; |
| 75 | struct sched_class *e, *end; |
| 76 | struct sched_class *found = NULL; |
| 77 | |
| 78 | if (!p) { |
| 79 | /* Get any available unused class */ |
| 80 | end = &s->tab[s->sched_size]; |
| 81 | for (e = &s->tab[0]; e != end; ++e) { |
| 82 | if (e->state == SCHED_STATE_UNUSED) { |
| 83 | found = e; |
| 84 | break; |
| 85 | } |
| 86 | } |
| 87 | } else { |
| 88 | /* Look for a class with matching scheduling parameters */ |
| 89 | struct ch_sched_params info; |
| 90 | struct ch_sched_params tp; |
| 91 | |
| 92 | memset(&info, 0, sizeof(info)); |
| 93 | memset(&tp, 0, sizeof(tp)); |
| 94 | |
| 95 | memcpy(&tp, p, sizeof(tp)); |
| 96 | /* Don't try to match class parameter */ |
| 97 | tp.u.params.class = SCHED_CLS_NONE; |
| 98 | |
| 99 | end = &s->tab[s->sched_size]; |
| 100 | for (e = &s->tab[0]; e != end; ++e) { |
| 101 | if (e->state == SCHED_STATE_UNUSED) |
| 102 | continue; |
| 103 | |
| 104 | memset(&info, 0, sizeof(info)); |
| 105 | memcpy(&info, &e->info, sizeof(info)); |
| 106 | /* Don't try to match class parameter */ |
| 107 | info.u.params.class = SCHED_CLS_NONE; |
| 108 | |
| 109 | if ((info.type == tp.type) && |
| 110 | (!memcmp(&info.u.params, &tp.u.params, |
| 111 | sizeof(info.u.params)))) { |
| 112 | found = e; |
| 113 | break; |
| 114 | } |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | return found; |
| 119 | } |
| 120 | |
| 121 | static struct sched_class *t4_sched_class_alloc(struct port_info *pi, |
| 122 | struct ch_sched_params *p) |
| 123 | { |
| 124 | struct sched_table *s = pi->sched_tbl; |
| 125 | struct sched_class *e; |
| 126 | u8 class_id; |
| 127 | int err; |
| 128 | |
| 129 | if (!p) |
| 130 | return NULL; |
| 131 | |
| 132 | class_id = p->u.params.class; |
| 133 | |
| 134 | /* Only accept search for existing class with matching params |
| 135 | * or allocation of new class with specified params |
| 136 | */ |
| 137 | if (class_id != SCHED_CLS_NONE) |
| 138 | return NULL; |
| 139 | |
| 140 | write_lock(&s->rw_lock); |
| 141 | /* See if there's an exisiting class with same |
| 142 | * requested sched params |
| 143 | */ |
| 144 | e = t4_sched_class_lookup(pi, p); |
| 145 | if (!e) { |
| 146 | struct ch_sched_params np; |
| 147 | |
| 148 | /* Fetch any available unused class */ |
| 149 | e = t4_sched_class_lookup(pi, NULL); |
| 150 | if (!e) |
| 151 | goto out; |
| 152 | |
| 153 | memset(&np, 0, sizeof(np)); |
| 154 | memcpy(&np, p, sizeof(np)); |
| 155 | np.u.params.class = e->idx; |
| 156 | |
| 157 | spin_lock(&e->lock); |
| 158 | /* New class */ |
| 159 | err = t4_sched_class_fw_cmd(pi, &np, SCHED_FW_OP_ADD); |
| 160 | if (err) { |
| 161 | spin_unlock(&e->lock); |
| 162 | e = NULL; |
| 163 | goto out; |
| 164 | } |
| 165 | memcpy(&e->info, &np, sizeof(e->info)); |
| 166 | atomic_set(&e->refcnt, 0); |
| 167 | e->state = SCHED_STATE_ACTIVE; |
| 168 | spin_unlock(&e->lock); |
| 169 | } |
| 170 | |
| 171 | out: |
| 172 | write_unlock(&s->rw_lock); |
| 173 | return e; |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * cxgb4_sched_class_alloc - allocate a scheduling class |
| 178 | * @dev: net_device pointer |
| 179 | * @p: new scheduling class to create. |
| 180 | * |
| 181 | * Returns pointer to the scheduling class created. If @p is NULL, then |
| 182 | * it allocates and returns any available unused scheduling class. If a |
| 183 | * scheduling class with matching @p is found, then the matching class is |
| 184 | * returned. |
| 185 | */ |
| 186 | struct sched_class *cxgb4_sched_class_alloc(struct net_device *dev, |
| 187 | struct ch_sched_params *p) |
| 188 | { |
| 189 | struct port_info *pi = netdev2pinfo(dev); |
| 190 | u8 class_id; |
| 191 | |
| 192 | if (!can_sched(dev)) |
| 193 | return NULL; |
| 194 | |
| 195 | class_id = p->u.params.class; |
| 196 | if (!valid_class_id(dev, class_id)) |
| 197 | return NULL; |
| 198 | |
| 199 | return t4_sched_class_alloc(pi, p); |
| 200 | } |
| 201 | |
| 202 | struct sched_table *t4_init_sched(unsigned int sched_size) |
| 203 | { |
| 204 | struct sched_table *s; |
| 205 | unsigned int i; |
| 206 | |
| 207 | s = t4_alloc_mem(sizeof(*s) + sched_size * sizeof(struct sched_class)); |
| 208 | if (!s) |
| 209 | return NULL; |
| 210 | |
| 211 | s->sched_size = sched_size; |
| 212 | rwlock_init(&s->rw_lock); |
| 213 | |
| 214 | for (i = 0; i < s->sched_size; i++) { |
| 215 | memset(&s->tab[i], 0, sizeof(struct sched_class)); |
| 216 | s->tab[i].idx = i; |
| 217 | s->tab[i].state = SCHED_STATE_UNUSED; |
| 218 | spin_lock_init(&s->tab[i].lock); |
| 219 | atomic_set(&s->tab[i].refcnt, 0); |
| 220 | } |
| 221 | return s; |
| 222 | } |
| 223 | |
| 224 | void t4_cleanup_sched(struct adapter *adap) |
| 225 | { |
| 226 | struct sched_table *s; |
| 227 | unsigned int i; |
| 228 | |
| 229 | for_each_port(adap, i) { |
| 230 | struct port_info *pi = netdev2pinfo(adap->port[i]); |
| 231 | |
| 232 | s = pi->sched_tbl; |
| 233 | t4_free_mem(s); |
| 234 | } |
| 235 | } |