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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* 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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#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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