1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
/**********************************************************************
* Author: Cavium Networks
*
* Contact: support@caviumnetworks.com
* This file is part of the OCTEON SDK
*
* Copyright (c) 2003-2010 Cavium Networks
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, Version 2, as
* published by the Free Software Foundation.
*
* This file is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* or visit http://www.gnu.org/licenses/.
*
* This file may also be available under a different license from Cavium.
* Contact Cavium Networks for more information
**********************************************************************/
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <asm/octeon/octeon.h>
#include "ethernet-defines.h"
#include "cvmx-fpa.h"
/**
* cvm_oct_fill_hw_skbuff - fill the supplied hardware pool with skbuffs
* @pool: Pool to allocate an skbuff for
* @size: Size of the buffer needed for the pool
* @elements: Number of buffers to allocate
*
* Returns the actual number of buffers allocated.
*/
static int cvm_oct_fill_hw_skbuff(int pool, int size, int elements)
{
int freed = elements;
while (freed) {
struct sk_buff *skb = dev_alloc_skb(size + 256);
if (unlikely(skb == NULL)) {
pr_warning
("Failed to allocate skb for hardware pool %d\n",
pool);
break;
}
skb_reserve(skb, 256 - (((unsigned long)skb->data) & 0x7f));
*(struct sk_buff **)(skb->data - sizeof(void *)) = skb;
cvmx_fpa_free(skb->data, pool, DONT_WRITEBACK(size / 128));
freed--;
}
return elements - freed;
}
/**
* cvm_oct_free_hw_skbuff- free hardware pool skbuffs
* @pool: Pool to allocate an skbuff for
* @size: Size of the buffer needed for the pool
* @elements: Number of buffers to allocate
*/
static void cvm_oct_free_hw_skbuff(int pool, int size, int elements)
{
char *memory;
do {
memory = cvmx_fpa_alloc(pool);
if (memory) {
struct sk_buff *skb =
*(struct sk_buff **)(memory - sizeof(void *));
elements--;
dev_kfree_skb(skb);
}
} while (memory);
if (elements < 0)
pr_warning("Freeing of pool %u had too many skbuffs (%d)\n",
pool, elements);
else if (elements > 0)
pr_warning("Freeing of pool %u is missing %d skbuffs\n",
pool, elements);
}
/**
* cvm_oct_fill_hw_memory - fill a hardware pool with memory.
* @pool: Pool to populate
* @size: Size of each buffer in the pool
* @elements: Number of buffers to allocate
*
* Returns the actual number of buffers allocated.
*/
static int cvm_oct_fill_hw_memory(int pool, int size, int elements)
{
char *memory;
char *fpa;
int freed = elements;
while (freed) {
/*
* FPA memory must be 128 byte aligned. Since we are
* aligning we need to save the original pointer so we
* can feed it to kfree when the memory is returned to
* the kernel.
*
* We allocate an extra 256 bytes to allow for
* alignment and space for the original pointer saved
* just before the block.
*/
memory = kmalloc(size + 256, GFP_ATOMIC);
if (unlikely(memory == NULL)) {
pr_warning("Unable to allocate %u bytes for FPA pool %d\n",
elements * size, pool);
break;
}
fpa = (char *)(((unsigned long)memory + 256) & ~0x7fUL);
*((char **)fpa - 1) = memory;
cvmx_fpa_free(fpa, pool, 0);
freed--;
}
return elements - freed;
}
/**
* cvm_oct_free_hw_memory - Free memory allocated by cvm_oct_fill_hw_memory
* @pool: FPA pool to free
* @size: Size of each buffer in the pool
* @elements: Number of buffers that should be in the pool
*/
static void cvm_oct_free_hw_memory(int pool, int size, int elements)
{
char *memory;
char *fpa;
do {
fpa = cvmx_fpa_alloc(pool);
if (fpa) {
elements--;
fpa = (char *)phys_to_virt(cvmx_ptr_to_phys(fpa));
memory = *((char **)fpa - 1);
kfree(memory);
}
} while (fpa);
if (elements < 0)
pr_warning("Freeing of pool %u had too many buffers (%d)\n",
pool, elements);
else if (elements > 0)
pr_warning("Warning: Freeing of pool %u is missing %d buffers\n",
pool, elements);
}
int cvm_oct_mem_fill_fpa(int pool, int size, int elements)
{
int freed;
if (USE_SKBUFFS_IN_HW && pool == CVMX_FPA_PACKET_POOL)
freed = cvm_oct_fill_hw_skbuff(pool, size, elements);
else
freed = cvm_oct_fill_hw_memory(pool, size, elements);
return freed;
}
void cvm_oct_mem_empty_fpa(int pool, int size, int elements)
{
if (USE_SKBUFFS_IN_HW && pool == CVMX_FPA_PACKET_POOL)
cvm_oct_free_hw_skbuff(pool, size, elements);
else
cvm_oct_free_hw_memory(pool, size, elements);
}
|
