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1 | /********************************************************************** |
2 | * Author: Cavium Networks | |
3 | * | |
4 | * Contact: support@caviumnetworks.com | |
5 | * This file is part of the OCTEON SDK | |
6 | * | |
166bdaa9 | 7 | * Copyright (c) 2003-2010 Cavium Networks |
80ff0fd3 DD |
8 | * |
9 | * This file is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License, Version 2, as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This file is distributed in the hope that it will be useful, but | |
14 | * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty | |
15 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or | |
16 | * NONINFRINGEMENT. See the GNU General Public License for more | |
17 | * details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this file; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | * or visit http://www.gnu.org/licenses/. | |
23 | * | |
24 | * This file may also be available under a different license from Cavium. | |
25 | * Contact Cavium Networks for more information | |
26 | **********************************************************************/ | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/netdevice.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
80ff0fd3 DD |
30 | |
31 | #include <asm/octeon/octeon.h> | |
32 | ||
33 | #include "ethernet-defines.h" | |
34 | ||
35 | #include "cvmx-fpa.h" | |
36 | ||
37 | /** | |
ec977c5b | 38 | * cvm_oct_fill_hw_skbuff - fill the supplied hardware pool with skbuffs |
80ff0fd3 DD |
39 | * @pool: Pool to allocate an skbuff for |
40 | * @size: Size of the buffer needed for the pool | |
41 | * @elements: Number of buffers to allocate | |
ec977c5b DD |
42 | * |
43 | * Returns the actual number of buffers allocated. | |
80ff0fd3 DD |
44 | */ |
45 | static int cvm_oct_fill_hw_skbuff(int pool, int size, int elements) | |
46 | { | |
47 | int freed = elements; | |
48 | while (freed) { | |
49 | ||
166bdaa9 | 50 | struct sk_buff *skb = dev_alloc_skb(size + 256); |
80ff0fd3 DD |
51 | if (unlikely(skb == NULL)) { |
52 | pr_warning | |
53 | ("Failed to allocate skb for hardware pool %d\n", | |
54 | pool); | |
55 | break; | |
56 | } | |
57 | ||
166bdaa9 | 58 | skb_reserve(skb, 256 - (((unsigned long)skb->data) & 0x7f)); |
80ff0fd3 DD |
59 | *(struct sk_buff **)(skb->data - sizeof(void *)) = skb; |
60 | cvmx_fpa_free(skb->data, pool, DONT_WRITEBACK(size / 128)); | |
61 | freed--; | |
62 | } | |
63 | return elements - freed; | |
64 | } | |
65 | ||
66 | /** | |
ec977c5b | 67 | * cvm_oct_free_hw_skbuff- free hardware pool skbuffs |
80ff0fd3 DD |
68 | * @pool: Pool to allocate an skbuff for |
69 | * @size: Size of the buffer needed for the pool | |
70 | * @elements: Number of buffers to allocate | |
71 | */ | |
72 | static void cvm_oct_free_hw_skbuff(int pool, int size, int elements) | |
73 | { | |
74 | char *memory; | |
75 | ||
76 | do { | |
77 | memory = cvmx_fpa_alloc(pool); | |
78 | if (memory) { | |
79 | struct sk_buff *skb = | |
80 | *(struct sk_buff **)(memory - sizeof(void *)); | |
81 | elements--; | |
82 | dev_kfree_skb(skb); | |
83 | } | |
84 | } while (memory); | |
85 | ||
86 | if (elements < 0) | |
87 | pr_warning("Freeing of pool %u had too many skbuffs (%d)\n", | |
88 | pool, elements); | |
89 | else if (elements > 0) | |
90 | pr_warning("Freeing of pool %u is missing %d skbuffs\n", | |
91 | pool, elements); | |
92 | } | |
93 | ||
94 | /** | |
ec977c5b | 95 | * cvm_oct_fill_hw_memory - fill a hardware pool with memory. |
80ff0fd3 DD |
96 | * @pool: Pool to populate |
97 | * @size: Size of each buffer in the pool | |
98 | * @elements: Number of buffers to allocate | |
ec977c5b DD |
99 | * |
100 | * Returns the actual number of buffers allocated. | |
80ff0fd3 DD |
101 | */ |
102 | static int cvm_oct_fill_hw_memory(int pool, int size, int elements) | |
103 | { | |
104 | char *memory; | |
166bdaa9 | 105 | char *fpa; |
80ff0fd3 DD |
106 | int freed = elements; |
107 | ||
6568a234 | 108 | while (freed) { |
166bdaa9 DD |
109 | /* |
110 | * FPA memory must be 128 byte aligned. Since we are | |
111 | * aligning we need to save the original pointer so we | |
112 | * can feed it to kfree when the memory is returned to | |
113 | * the kernel. | |
114 | * | |
115 | * We allocate an extra 256 bytes to allow for | |
116 | * alignment and space for the original pointer saved | |
117 | * just before the block. | |
118 | */ | |
119 | memory = kmalloc(size + 256, GFP_ATOMIC); | |
6568a234 DD |
120 | if (unlikely(memory == NULL)) { |
121 | pr_warning("Unable to allocate %u bytes for FPA pool %d\n", | |
122 | elements * size, pool); | |
123 | break; | |
80ff0fd3 | 124 | } |
166bdaa9 DD |
125 | fpa = (char *)(((unsigned long)memory + 256) & ~0x7fUL); |
126 | *((char **)fpa - 1) = memory; | |
127 | cvmx_fpa_free(fpa, pool, 0); | |
6568a234 | 128 | freed--; |
80ff0fd3 DD |
129 | } |
130 | return elements - freed; | |
131 | } | |
132 | ||
133 | /** | |
ec977c5b | 134 | * cvm_oct_free_hw_memory - Free memory allocated by cvm_oct_fill_hw_memory |
80ff0fd3 DD |
135 | * @pool: FPA pool to free |
136 | * @size: Size of each buffer in the pool | |
137 | * @elements: Number of buffers that should be in the pool | |
138 | */ | |
139 | static void cvm_oct_free_hw_memory(int pool, int size, int elements) | |
140 | { | |
6568a234 | 141 | char *memory; |
166bdaa9 | 142 | char *fpa; |
6568a234 | 143 | do { |
166bdaa9 DD |
144 | fpa = cvmx_fpa_alloc(pool); |
145 | if (fpa) { | |
6568a234 | 146 | elements--; |
166bdaa9 DD |
147 | fpa = (char *)phys_to_virt(cvmx_ptr_to_phys(fpa)); |
148 | memory = *((char **)fpa - 1); | |
149 | kfree(memory); | |
6568a234 | 150 | } |
166bdaa9 | 151 | } while (fpa); |
80ff0fd3 | 152 | |
6568a234 DD |
153 | if (elements < 0) |
154 | pr_warning("Freeing of pool %u had too many buffers (%d)\n", | |
155 | pool, elements); | |
156 | else if (elements > 0) | |
157 | pr_warning("Warning: Freeing of pool %u is missing %d buffers\n", | |
158 | pool, elements); | |
80ff0fd3 DD |
159 | } |
160 | ||
161 | int cvm_oct_mem_fill_fpa(int pool, int size, int elements) | |
162 | { | |
163 | int freed; | |
166bdaa9 | 164 | if (USE_SKBUFFS_IN_HW && pool == CVMX_FPA_PACKET_POOL) |
80ff0fd3 DD |
165 | freed = cvm_oct_fill_hw_skbuff(pool, size, elements); |
166 | else | |
167 | freed = cvm_oct_fill_hw_memory(pool, size, elements); | |
168 | return freed; | |
169 | } | |
170 | ||
171 | void cvm_oct_mem_empty_fpa(int pool, int size, int elements) | |
172 | { | |
166bdaa9 | 173 | if (USE_SKBUFFS_IN_HW && pool == CVMX_FPA_PACKET_POOL) |
80ff0fd3 DD |
174 | cvm_oct_free_hw_skbuff(pool, size, elements); |
175 | else | |
176 | cvm_oct_free_hw_memory(pool, size, elements); | |
177 | } |