]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/core/hwbm.c
1 /* Support for hardware buffer manager.
3 * Copyright (C) 2016 Marvell
5 * Gregory CLEMENT <gregory.clement@free-electrons.com>
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.
12 #include <linux/kernel.h>
13 #include <linux/printk.h>
14 #include <linux/skbuff.h>
17 void hwbm_buf_free(struct hwbm_pool
*bm_pool
, void *buf
)
19 if (likely(bm_pool
->frag_size
<= PAGE_SIZE
))
24 EXPORT_SYMBOL_GPL(hwbm_buf_free
);
26 /* Refill processing for HW buffer management */
27 int hwbm_pool_refill(struct hwbm_pool
*bm_pool
, gfp_t gfp
)
29 int frag_size
= bm_pool
->frag_size
;
32 if (likely(frag_size
<= PAGE_SIZE
))
33 buf
= netdev_alloc_frag(frag_size
);
35 buf
= kmalloc(frag_size
, gfp
);
40 if (bm_pool
->construct
)
41 if (bm_pool
->construct(bm_pool
, buf
)) {
42 hwbm_buf_free(bm_pool
, buf
);
48 EXPORT_SYMBOL_GPL(hwbm_pool_refill
);
50 int hwbm_pool_add(struct hwbm_pool
*bm_pool
, unsigned int buf_num
, gfp_t gfp
)
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
;
61 if (buf_num
+ bm_pool
->buf_num
> bm_pool
->size
) {
62 pr_warn("cannot allocate %d buffers for pool\n",
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
);
73 for (i
= 0; i
< buf_num
; i
++) {
74 err
= hwbm_pool_refill(bm_pool
, gfp
);
79 /* Update BM driver with number of buffers added to pool */
80 bm_pool
->buf_num
+= i
;
82 pr_debug("hwpm pool: %d of %d buffers added\n", i
, buf_num
);
83 spin_unlock_irqrestore(&bm_pool
->lock
, flags
);
87 EXPORT_SYMBOL_GPL(hwbm_pool_add
);