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90 lines
2.2 KiB
90 lines
2.2 KiB
/* Support for hardware buffer manager.
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*
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* Copyright (C) 2016 Marvell
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*
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* Gregory CLEMENT <gregory.clement@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/printk.h>
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#include <linux/skbuff.h>
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#include <net/hwbm.h>
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void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf)
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{
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if (likely(bm_pool->frag_size <= PAGE_SIZE))
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skb_free_frag(buf);
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else
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kfree(buf);
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}
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EXPORT_SYMBOL_GPL(hwbm_buf_free);
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/* Refill processing for HW buffer management */
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int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp)
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{
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int frag_size = bm_pool->frag_size;
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void *buf;
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if (likely(frag_size <= PAGE_SIZE))
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buf = netdev_alloc_frag(frag_size);
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else
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buf = kmalloc(frag_size, gfp);
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if (!buf)
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return -ENOMEM;
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if (bm_pool->construct)
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if (bm_pool->construct(bm_pool, buf)) {
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hwbm_buf_free(bm_pool, buf);
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return -ENOMEM;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(hwbm_pool_refill);
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int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp)
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{
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int err, i;
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unsigned long flags;
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spin_lock_irqsave(&bm_pool->lock, flags);
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if (bm_pool->buf_num == bm_pool->size) {
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pr_warn("pool already filled\n");
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spin_unlock_irqrestore(&bm_pool->lock, flags);
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return bm_pool->buf_num;
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}
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if (buf_num + bm_pool->buf_num > bm_pool->size) {
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pr_warn("cannot allocate %d buffers for pool\n",
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buf_num);
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spin_unlock_irqrestore(&bm_pool->lock, flags);
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return 0;
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}
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if ((buf_num + bm_pool->buf_num) < bm_pool->buf_num) {
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pr_warn("Adding %d buffers to the %d current buffers will overflow\n",
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buf_num, bm_pool->buf_num);
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spin_unlock_irqrestore(&bm_pool->lock, flags);
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return 0;
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}
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for (i = 0; i < buf_num; i++) {
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err = hwbm_pool_refill(bm_pool, gfp);
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if (err < 0)
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break;
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}
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/* Update BM driver with number of buffers added to pool */
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bm_pool->buf_num += i;
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pr_debug("hwpm pool: %d of %d buffers added\n", i, buf_num);
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spin_unlock_irqrestore(&bm_pool->lock, flags);
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return i;
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}
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EXPORT_SYMBOL_GPL(hwbm_pool_add);
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