+++ /dev/null
-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);
projects / openwrt / staging / lynxis / omap.git / blobdiff