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85 lines
1.9 KiB
85 lines
1.9 KiB
// 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 <[email protected]> |
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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) |
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{ |
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int err, i; |
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mutex_lock(&bm_pool->buf_lock); |
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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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mutex_unlock(&bm_pool->buf_lock); |
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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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mutex_unlock(&bm_pool->buf_lock); |
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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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mutex_unlock(&bm_pool->buf_lock); |
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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_KERNEL); |
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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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mutex_unlock(&bm_pool->buf_lock); |
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return i; |
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} |
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EXPORT_SYMBOL_GPL(hwbm_pool_add);
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