projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 8cb2d8bf GC |
2 | /* Support for hardware buffer manager. |
| 3 | * | |
| 4 | * Copyright (C) 2016 Marvell | |
| 5 | * | |
| 6 | * Gregory CLEMENT <gregory.clement@free-electrons.com> | |
| 8cb2d8bf GC |
7 | */ |
| 8 | #include <linux/kernel.h> | |
| 9 | #include <linux/printk.h> | |
| 10 | #include <linux/skbuff.h> | |
| 11 | #include <net/hwbm.h> | |
| 12 | ||
| 13 | void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf) | |
| 14 | { | |
| 15 | if (likely(bm_pool->frag_size <= PAGE_SIZE)) | |
| 16 | skb_free_frag(buf); | |
| 17 | else | |
| 18 | kfree(buf); | |
| 19 | } | |
| 20 | EXPORT_SYMBOL_GPL(hwbm_buf_free); | |
| 21 | ||
| 22 | /* Refill processing for HW buffer management */ | |
| 23 | int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp) | |
| 24 | { | |
| 25 | int frag_size = bm_pool->frag_size; | |
| 26 | void *buf; | |
| 27 | ||
| 28 | if (likely(frag_size <= PAGE_SIZE)) | |
| 29 | buf = netdev_alloc_frag(frag_size); | |
| 30 | else | |
| 31 | buf = kmalloc(frag_size, gfp); | |
| 32 | ||
| 33 | if (!buf) | |
| 34 | return -ENOMEM; | |
| 35 | ||
| 36 | if (bm_pool->construct) | |
| 37 | if (bm_pool->construct(bm_pool, buf)) { | |
| 38 | hwbm_buf_free(bm_pool, buf); | |
| 39 | return -ENOMEM; | |
| 40 | } | |
| 41 | ||
| 42 | return 0; | |
| 43 | } | |
| 44 | EXPORT_SYMBOL_GPL(hwbm_pool_refill); | |
| 45 | ||
| 46 | int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp) | |
| 47 | { | |
| 48 | int err, i; | |
| 49 | unsigned long flags; | |
| 50 | ||
| 51 | spin_lock_irqsave(&bm_pool->lock, flags); | |
| 52 | if (bm_pool->buf_num == bm_pool->size) { | |
| 53 | pr_warn("pool already filled\n"); | |
| b388fc74 | 54 | spin_unlock_irqrestore(&bm_pool->lock, flags); |
| 8cb2d8bf GC |
55 | return bm_pool->buf_num; |
| 56 | } | |
| 57 | ||
| 58 | if (buf_num + bm_pool->buf_num > bm_pool->size) { | |
| 59 | pr_warn("cannot allocate %d buffers for pool\n", | |
| 60 | buf_num); | |
| b388fc74 | 61 | spin_unlock_irqrestore(&bm_pool->lock, flags); |
| 8cb2d8bf GC |
62 | return 0; |
| 63 | } | |
| 64 | ||
| 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); | |
| b388fc74 | 68 | spin_unlock_irqrestore(&bm_pool->lock, flags); |
| 8cb2d8bf GC |
69 | return 0; |
| 70 | } | |
| 71 | ||
| 72 | for (i = 0; i < buf_num; i++) { | |
| 73 | err = hwbm_pool_refill(bm_pool, gfp); | |
| 74 | if (err < 0) | |
| 75 | break; | |
| 76 | } | |
| 77 | ||
| 78 | /* Update BM driver with number of buffers added to pool */ | |
| 79 | bm_pool->buf_num += i; | |
| 80 | ||
| 81 | pr_debug("hwpm pool: %d of %d buffers added\n", i, buf_num); | |
| 82 | spin_unlock_irqrestore(&bm_pool->lock, flags); | |
| 83 | ||
| 84 | return i; | |
| 85 | } | |
| 86 | EXPORT_SYMBOL_GPL(hwbm_pool_add); |