diff options
Diffstat (limited to 'target/linux/mvebu/patches-4.4/044-net-add-a-hardware-buffer-management-helper-API.patch')
| -rw-r--r-- | target/linux/mvebu/patches-4.4/044-net-add-a-hardware-buffer-management-helper-API.patch | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-4.4/044-net-add-a-hardware-buffer-management-helper-API.patch b/target/linux/mvebu/patches-4.4/044-net-add-a-hardware-buffer-management-helper-API.patch new file mode 100644 index 0000000000..d4bc6a0088 --- /dev/null +++ b/target/linux/mvebu/patches-4.4/044-net-add-a-hardware-buffer-management-helper-API.patch @@ -0,0 +1,159 @@ +From: Gregory CLEMENT <gregory.clement@free-electrons.com> +Date: Mon, 14 Mar 2016 09:39:04 +0100 +Subject: [PATCH] net: add a hardware buffer management helper API + +This basic implementation allows to share code between driver using +hardware buffer management. As the code is hardware agnostic, there is +few helpers, most of the optimization brought by the an HW BM has to be +done at driver level. + +Tested-by: Sebastian Careba <nitroshift@yahoo.com> +Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + create mode 100644 include/net/hwbm.h + create mode 100644 net/core/hwbm.c + +--- /dev/null ++++ b/include/net/hwbm.h +@@ -0,0 +1,28 @@ ++#ifndef _HWBM_H ++#define _HWBM_H ++ ++struct hwbm_pool { ++ /* Capacity of the pool */ ++ int size; ++ /* Size of the buffers managed */ ++ int frag_size; ++ /* Number of buffers currently used by this pool */ ++ int buf_num; ++ /* constructor called during alocation */ ++ int (*construct)(struct hwbm_pool *bm_pool, void *buf); ++ /* protect acces to the buffer counter*/ ++ spinlock_t lock; ++ /* private data */ ++ void *priv; ++}; ++#ifdef CONFIG_HWBM ++void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf); ++int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp); ++int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp); ++#else ++void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf) {} ++int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp) { return 0; } ++int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp) ++{ return 0; } ++#endif /* CONFIG_HWBM */ ++#endif /* _HWBM_H */ +--- a/net/Kconfig ++++ b/net/Kconfig +@@ -259,6 +259,9 @@ config XPS + depends on SMP + default y + ++config HWBM ++ bool ++ + config CGROUP_NET_PRIO + bool "Network priority cgroup" + depends on CGROUPS +--- a/net/core/Makefile ++++ b/net/core/Makefile +@@ -14,6 +14,7 @@ obj-y += dev.o ethtool.o dev_addr_ + obj-$(CONFIG_SOCK_DIAG) += sock_diag.o + obj-$(CONFIG_XFRM) += flow.o + obj-y += net-sysfs.o ++obj-$(CONFIG_HWBM) += hwbm.o + obj-$(CONFIG_PROC_FS) += net-procfs.o + obj-$(CONFIG_NET_PKTGEN) += pktgen.o + obj-$(CONFIG_NETPOLL) += netpoll.o +--- /dev/null ++++ b/net/core/hwbm.c +@@ -0,0 +1,87 @@ ++/* Support for hardware buffer manager. ++ * ++ * Copyright (C) 2016 Marvell ++ * ++ * Gregory CLEMENT <gregory.clement@free-electrons.com> ++ * ++ * 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. ++ */ ++#include <linux/kernel.h> ++#include <linux/printk.h> ++#include <linux/skbuff.h> ++#include <net/hwbm.h> ++ ++void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf) ++{ ++ if (likely(bm_pool->frag_size <= PAGE_SIZE)) ++ skb_free_frag(buf); ++ else ++ kfree(buf); ++} ++EXPORT_SYMBOL_GPL(hwbm_buf_free); ++ ++/* Refill processing for HW buffer management */ ++int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp) ++{ ++ int frag_size = bm_pool->frag_size; ++ void *buf; ++ ++ if (likely(frag_size <= PAGE_SIZE)) ++ buf = netdev_alloc_frag(frag_size); ++ else ++ buf = kmalloc(frag_size, gfp); ++ ++ if (!buf) ++ return -ENOMEM; ++ ++ if (bm_pool->construct) ++ if (bm_pool->construct(bm_pool, buf)) { ++ hwbm_buf_free(bm_pool, buf); ++ return -ENOMEM; ++ } ++ ++ return 0; ++} ++EXPORT_SYMBOL_GPL(hwbm_pool_refill); ++ ++int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp) ++{ ++ int err, i; ++ unsigned long flags; ++ ++ spin_lock_irqsave(&bm_pool->lock, flags); ++ if (bm_pool->buf_num == bm_pool->size) { ++ pr_warn("pool already filled\n"); ++ return bm_pool->buf_num; ++ } ++ ++ if (buf_num + bm_pool->buf_num > bm_pool->size) { ++ pr_warn("cannot allocate %d buffers for pool\n", ++ buf_num); ++ return 0; ++ } ++ ++ if ((buf_num + bm_pool->buf_num) < bm_pool->buf_num) { ++ pr_warn("Adding %d buffers to the %d current buffers will overflow\n", ++ buf_num, bm_pool->buf_num); ++ return 0; ++ } ++ ++ for (i = 0; i < buf_num; i++) { ++ err = hwbm_pool_refill(bm_pool, gfp); ++ if (err < 0) ++ break; ++ } ++ ++ /* Update BM driver with number of buffers added to pool */ ++ bm_pool->buf_num += i; ++ ++ pr_debug("hwpm pool: %d of %d buffers added\n", i, buf_num); ++ spin_unlock_irqrestore(&bm_pool->lock, flags); ++ ++ return i; ++} ++EXPORT_SYMBOL_GPL(hwbm_pool_add); |