1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Support for hardware buffer manager.
4 * Copyright (C) 2016 Marvell
6 * Gregory CLEMENT <gregory.clement@free-electrons.com>
8 #include <linux/kernel.h>
9 #include <linux/printk.h>
10 #include <linux/skbuff.h>
13 void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf)
15 if (likely(bm_pool->frag_size <= PAGE_SIZE))
20 EXPORT_SYMBOL_GPL(hwbm_buf_free);
22 /* Refill processing for HW buffer management */
23 int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp)
25 int frag_size = bm_pool->frag_size;
28 if (likely(frag_size <= PAGE_SIZE))
29 buf = netdev_alloc_frag(frag_size);
31 buf = kmalloc(frag_size, gfp);
36 if (bm_pool->construct)
37 if (bm_pool->construct(bm_pool, buf)) {
38 hwbm_buf_free(bm_pool, buf);
44 EXPORT_SYMBOL_GPL(hwbm_pool_refill);
46 int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp)
51 spin_lock_irqsave(&bm_pool->lock, flags);
52 if (bm_pool->buf_num == bm_pool->size) {
53 pr_warn("pool already filled\n");
54 spin_unlock_irqrestore(&bm_pool->lock, flags);
55 return bm_pool->buf_num;
58 if (buf_num + bm_pool->buf_num > bm_pool->size) {
59 pr_warn("cannot allocate %d buffers for pool\n",
61 spin_unlock_irqrestore(&bm_pool->lock, flags);
65 if ((buf_num + bm_pool->buf_num) < bm_pool->buf_num) {
66 pr_warn("Adding %d buffers to the %d current buffers will overflow\n",
67 buf_num, bm_pool->buf_num);
68 spin_unlock_irqrestore(&bm_pool->lock, flags);
72 for (i = 0; i < buf_num; i++) {
73 err = hwbm_pool_refill(bm_pool, gfp);
78 /* Update BM driver with number of buffers added to pool */
79 bm_pool->buf_num += i;
81 pr_debug("hwpm pool: %d of %d buffers added\n", i, buf_num);
82 spin_unlock_irqrestore(&bm_pool->lock, flags);
86 EXPORT_SYMBOL_GPL(hwbm_pool_add);