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yaml --- r: 302603 b: refs/heads/master c: ec3eead h: refs/heads/master i: 302601: a49d792 302599: bc87ed8 v: v3
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Vipul Pandya
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Roland Dreier
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May 18, 2012
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: d716a2a014ad199362a59004b5ab932030a213ff | ||
| refs/heads/master: ec3eead217181d7360a11317a888ceb30807867c |
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| /* | ||
| * Copyright (c) 2011 Chelsio Communications. 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/kernel.h> | ||
| #include <linux/random.h> | ||
| #include "iw_cxgb4.h" | ||
|
|
||
| #define RANDOM_SKIP 16 | ||
|
|
||
| /* | ||
| * Trivial bitmap-based allocator. If the random flag is set, the | ||
| * allocator is designed to: | ||
| * - pseudo-randomize the id returned such that it is not trivially predictable. | ||
| * - avoid reuse of recently used id (at the expense of predictability) | ||
| */ | ||
| u32 c4iw_id_alloc(struct c4iw_id_table *alloc) | ||
| { | ||
| unsigned long flags; | ||
| u32 obj; | ||
|
|
||
| spin_lock_irqsave(&alloc->lock, flags); | ||
|
|
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| obj = find_next_zero_bit(alloc->table, alloc->max, alloc->last); | ||
| if (obj >= alloc->max) | ||
| obj = find_first_zero_bit(alloc->table, alloc->max); | ||
|
|
||
| if (obj < alloc->max) { | ||
| if (alloc->flags & C4IW_ID_TABLE_F_RANDOM) | ||
| alloc->last += random32() % RANDOM_SKIP; | ||
| else | ||
| alloc->last = obj + 1; | ||
| if (alloc->last >= alloc->max) | ||
| alloc->last = 0; | ||
| set_bit(obj, alloc->table); | ||
| obj += alloc->start; | ||
| } else | ||
| obj = -1; | ||
|
|
||
| spin_unlock_irqrestore(&alloc->lock, flags); | ||
| return obj; | ||
| } | ||
|
|
||
| void c4iw_id_free(struct c4iw_id_table *alloc, u32 obj) | ||
| { | ||
| unsigned long flags; | ||
|
|
||
| obj -= alloc->start; | ||
| BUG_ON((int)obj < 0); | ||
|
|
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| spin_lock_irqsave(&alloc->lock, flags); | ||
| clear_bit(obj, alloc->table); | ||
| spin_unlock_irqrestore(&alloc->lock, flags); | ||
| } | ||
|
|
||
| int c4iw_id_table_alloc(struct c4iw_id_table *alloc, u32 start, u32 num, | ||
| u32 reserved, u32 flags) | ||
| { | ||
| int i; | ||
|
|
||
| alloc->start = start; | ||
| alloc->flags = flags; | ||
| if (flags & C4IW_ID_TABLE_F_RANDOM) | ||
| alloc->last = random32() % RANDOM_SKIP; | ||
| else | ||
| alloc->last = 0; | ||
| alloc->max = num; | ||
| spin_lock_init(&alloc->lock); | ||
| alloc->table = kmalloc(BITS_TO_LONGS(num) * sizeof(long), | ||
| GFP_KERNEL); | ||
| if (!alloc->table) | ||
| return -ENOMEM; | ||
|
|
||
| bitmap_zero(alloc->table, num); | ||
| if (!(alloc->flags & C4IW_ID_TABLE_F_EMPTY)) | ||
| for (i = 0; i < reserved; ++i) | ||
| set_bit(i, alloc->table); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| void c4iw_id_table_free(struct c4iw_id_table *alloc) | ||
| { | ||
| kfree(alloc->table); | ||
| } |
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