-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Using kfifos for ID management was limiting the number of QPs and preventing NP384 MPI jobs. So replace it with a simple bitmap allocator. Remove IDs from the IDR tables before deallocating them. This bug was causing the BUG_ON() in insert_handle() to fire because the ID was getting reused before being removed from the IDR table. Signed-off-by: Vipul Pandya <vipul@chelsio.com> Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
- Loading branch information
Vipul Pandya
authored and
Roland Dreier
committed
May 18, 2012
1 parent
d716a2a
commit ec3eead
Showing
7 changed files
with
203 additions
and
150 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,112 @@ | ||
/* | ||
* 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); | ||
|
||
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); | ||
|
||
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); | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.