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8cb2d8bf GC |
1 | /* Support for hardware buffer manager. |
2 | * | |
3 | * Copyright (C) 2016 Marvell | |
4 | * | |
5 | * Gregory CLEMENT <gregory.clement@free-electrons.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | */ | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/printk.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <net/hwbm.h> | |
16 | ||
17 | void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf) | |
18 | { | |
19 | if (likely(bm_pool->frag_size <= PAGE_SIZE)) | |
20 | skb_free_frag(buf); | |
21 | else | |
22 | kfree(buf); | |
23 | } | |
24 | EXPORT_SYMBOL_GPL(hwbm_buf_free); | |
25 | ||
26 | /* Refill processing for HW buffer management */ | |
27 | int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp) | |
28 | { | |
29 | int frag_size = bm_pool->frag_size; | |
30 | void *buf; | |
31 | ||
32 | if (likely(frag_size <= PAGE_SIZE)) | |
33 | buf = netdev_alloc_frag(frag_size); | |
34 | else | |
35 | buf = kmalloc(frag_size, gfp); | |
36 | ||
37 | if (!buf) | |
38 | return -ENOMEM; | |
39 | ||
40 | if (bm_pool->construct) | |
41 | if (bm_pool->construct(bm_pool, buf)) { | |
42 | hwbm_buf_free(bm_pool, buf); | |
43 | return -ENOMEM; | |
44 | } | |
45 | ||
46 | return 0; | |
47 | } | |
48 | EXPORT_SYMBOL_GPL(hwbm_pool_refill); | |
49 | ||
50 | int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp) | |
51 | { | |
52 | int err, i; | |
53 | unsigned long flags; | |
54 | ||
55 | spin_lock_irqsave(&bm_pool->lock, flags); | |
56 | if (bm_pool->buf_num == bm_pool->size) { | |
57 | pr_warn("pool already filled\n"); | |
58 | return bm_pool->buf_num; | |
59 | } | |
60 | ||
61 | if (buf_num + bm_pool->buf_num > bm_pool->size) { | |
62 | pr_warn("cannot allocate %d buffers for pool\n", | |
63 | buf_num); | |
64 | return 0; | |
65 | } | |
66 | ||
67 | if ((buf_num + bm_pool->buf_num) < bm_pool->buf_num) { | |
68 | pr_warn("Adding %d buffers to the %d current buffers will overflow\n", | |
69 | buf_num, bm_pool->buf_num); | |
70 | return 0; | |
71 | } | |
72 | ||
73 | for (i = 0; i < buf_num; i++) { | |
74 | err = hwbm_pool_refill(bm_pool, gfp); | |
75 | if (err < 0) | |
76 | break; | |
77 | } | |
78 | ||
79 | /* Update BM driver with number of buffers added to pool */ | |
80 | bm_pool->buf_num += i; | |
81 | ||
82 | pr_debug("hwpm pool: %d of %d buffers added\n", i, buf_num); | |
83 | spin_unlock_irqrestore(&bm_pool->lock, flags); | |
84 | ||
85 | return i; | |
86 | } | |
87 | EXPORT_SYMBOL_GPL(hwbm_pool_add); |