1// SPDX-License-Identifier: GPL-2.0
2/*
3 * This file is based on code from OCTEON SDK by Cavium Networks.
4 *
5 * Copyright (c) 2003-2010 Cavium Networks
6 */
7
8#include <linux/kernel.h>
9#include <linux/netdevice.h>
10#include <linux/slab.h>
11
12#include "octeon-ethernet.h"
13#include "ethernet-mem.h"
14#include "ethernet-defines.h"
15
16/**
17 * cvm_oct_fill_hw_skbuff - fill the supplied hardware pool with skbuffs
18 * @pool: Pool to allocate an skbuff for
19 * @size: Size of the buffer needed for the pool
20 * @elements: Number of buffers to allocate
21 *
22 * Returns the actual number of buffers allocated.
23 */
24static int cvm_oct_fill_hw_skbuff(int pool, int size, int elements)
25{
26 int freed = elements;
27
28 while (freed) {
29 struct sk_buff *skb = dev_alloc_skb(length: size + 256);
30
31 if (unlikely(!skb))
32 break;
33 skb_reserve(skb, len: 256 - (((unsigned long)skb->data) & 0x7f));
34 *(struct sk_buff **)(skb->data - sizeof(void *)) = skb;
35 cvmx_fpa_free(ptr: skb->data, pool, num_cache_lines: size / 128);
36 freed--;
37 }
38 return elements - freed;
39}
40
41/**
42 * cvm_oct_free_hw_skbuff- free hardware pool skbuffs
43 * @pool: Pool to allocate an skbuff for
44 * @size: Size of the buffer needed for the pool
45 * @elements: Number of buffers to allocate
46 */
47static void cvm_oct_free_hw_skbuff(int pool, int size, int elements)
48{
49 char *memory;
50
51 do {
52 memory = cvmx_fpa_alloc(pool);
53 if (memory) {
54 struct sk_buff *skb =
55 *(struct sk_buff **)(memory - sizeof(void *));
56 elements--;
57 dev_kfree_skb(skb);
58 }
59 } while (memory);
60
61 if (elements < 0)
62 pr_warn("Freeing of pool %u had too many skbuffs (%d)\n",
63 pool, elements);
64 else if (elements > 0)
65 pr_warn("Freeing of pool %u is missing %d skbuffs\n",
66 pool, elements);
67}
68
69/**
70 * cvm_oct_fill_hw_memory - fill a hardware pool with memory.
71 * @pool: Pool to populate
72 * @size: Size of each buffer in the pool
73 * @elements: Number of buffers to allocate
74 *
75 * Returns the actual number of buffers allocated.
76 */
77static int cvm_oct_fill_hw_memory(int pool, int size, int elements)
78{
79 char *memory;
80 char *fpa;
81 int freed = elements;
82
83 while (freed) {
84 /*
85 * FPA memory must be 128 byte aligned. Since we are
86 * aligning we need to save the original pointer so we
87 * can feed it to kfree when the memory is returned to
88 * the kernel.
89 *
90 * We allocate an extra 256 bytes to allow for
91 * alignment and space for the original pointer saved
92 * just before the block.
93 */
94 memory = kmalloc(size: size + 256, GFP_ATOMIC);
95 if (unlikely(!memory)) {
96 pr_warn("Unable to allocate %u bytes for FPA pool %d\n",
97 elements * size, pool);
98 break;
99 }
100 fpa = (char *)(((unsigned long)memory + 256) & ~0x7fUL);
101 *((char **)fpa - 1) = memory;
102 cvmx_fpa_free(ptr: fpa, pool, num_cache_lines: 0);
103 freed--;
104 }
105 return elements - freed;
106}
107
108/**
109 * cvm_oct_free_hw_memory - Free memory allocated by cvm_oct_fill_hw_memory
110 * @pool: FPA pool to free
111 * @size: Size of each buffer in the pool
112 * @elements: Number of buffers that should be in the pool
113 */
114static void cvm_oct_free_hw_memory(int pool, int size, int elements)
115{
116 char *memory;
117 char *fpa;
118
119 do {
120 fpa = cvmx_fpa_alloc(pool);
121 if (fpa) {
122 elements--;
123 fpa = (char *)phys_to_virt(address: cvmx_ptr_to_phys(ptr: fpa));
124 memory = *((char **)fpa - 1);
125 kfree(objp: memory);
126 }
127 } while (fpa);
128
129 if (elements < 0)
130 pr_warn("Freeing of pool %u had too many buffers (%d)\n",
131 pool, elements);
132 else if (elements > 0)
133 pr_warn("Warning: Freeing of pool %u is missing %d buffers\n",
134 pool, elements);
135}
136
137int cvm_oct_mem_fill_fpa(int pool, int size, int elements)
138{
139 int freed;
140
141 if (pool == CVMX_FPA_PACKET_POOL)
142 freed = cvm_oct_fill_hw_skbuff(pool, size, elements);
143 else
144 freed = cvm_oct_fill_hw_memory(pool, size, elements);
145 return freed;
146}
147
148void cvm_oct_mem_empty_fpa(int pool, int size, int elements)
149{
150 if (pool == CVMX_FPA_PACKET_POOL)
151 cvm_oct_free_hw_skbuff(pool, size, elements);
152 else
153 cvm_oct_free_hw_memory(pool, size, elements);
154}
155

source code of linux/drivers/staging/octeon/ethernet-mem.c