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, 0 insertions, 159 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 deleted file mode 100644 index d4bc6a0088..0000000000 --- a/target/linux/mvebu/patches-4.4/044-net-add-a-hardware-buffer-management-helper-API.patch +++ /dev/null @@ -1,159 +0,0 @@ -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); |