mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-30 02:29:01 +00:00
047695a029
This reverts commit 51397d7d95.
There are some unresolved random crashes on WRT1900AC v1 that still need
to be sorted out
Signed-off-by: Felix Fietkau <nbd@nbd.name>
160 lines
4.3 KiB
Diff
160 lines
4.3 KiB
Diff
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);
|