159 lines
4.3 KiB
Diff
159 lines
4.3 KiB
Diff
From: Gregory CLEMENT <gregory.clement@free-electrons.com>
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Date: Mon, 14 Mar 2016 09:39:04 +0100
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Subject: [PATCH] net: add a hardware buffer management helper API
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This basic implementation allows to share code between driver using
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hardware buffer management. As the code is hardware agnostic, there is
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few helpers, most of the optimization brought by the an HW BM has to be
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done at driver level.
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Tested-by: Sebastian Careba <nitroshift@yahoo.com>
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Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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create mode 100644 include/net/hwbm.h
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create mode 100644 net/core/hwbm.c
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--- /dev/null
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+++ b/include/net/hwbm.h
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@@ -0,0 +1,28 @@
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+#ifndef _HWBM_H
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+#define _HWBM_H
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+
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+struct hwbm_pool {
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+ /* Capacity of the pool */
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+ int size;
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+ /* Size of the buffers managed */
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+ int frag_size;
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+ /* Number of buffers currently used by this pool */
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+ int buf_num;
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+ /* constructor called during alocation */
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+ int (*construct)(struct hwbm_pool *bm_pool, void *buf);
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+ /* protect acces to the buffer counter*/
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+ spinlock_t lock;
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+ /* private data */
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+ void *priv;
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+};
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+#ifdef CONFIG_HWBM
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+void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf);
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+int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp);
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+int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp);
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+#else
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+void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf) {}
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+int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp) { return 0; }
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+int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp)
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+{ return 0; }
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+#endif /* CONFIG_HWBM */
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+#endif /* _HWBM_H */
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--- a/net/Kconfig
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+++ b/net/Kconfig
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@@ -259,6 +259,9 @@ config XPS
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depends on SMP
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default y
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+config HWBM
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+ bool
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+
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config CGROUP_NET_PRIO
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bool "Network priority cgroup"
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depends on CGROUPS
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--- a/net/core/Makefile
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+++ b/net/core/Makefile
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@@ -14,6 +14,7 @@ obj-y += dev.o ethtool.o dev_addr_
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obj-$(CONFIG_SOCK_DIAG) += sock_diag.o
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obj-$(CONFIG_XFRM) += flow.o
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obj-y += net-sysfs.o
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+obj-$(CONFIG_HWBM) += hwbm.o
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obj-$(CONFIG_PROC_FS) += net-procfs.o
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obj-$(CONFIG_NET_PKTGEN) += pktgen.o
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obj-$(CONFIG_NETPOLL) += netpoll.o
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--- /dev/null
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+++ b/net/core/hwbm.c
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@@ -0,0 +1,87 @@
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+/* Support for hardware buffer manager.
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+ *
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+ * Copyright (C) 2016 Marvell
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+ *
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+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ */
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+#include <linux/kernel.h>
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+#include <linux/printk.h>
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+#include <linux/skbuff.h>
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+#include <net/hwbm.h>
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+
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+void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf)
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+{
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+ if (likely(bm_pool->frag_size <= PAGE_SIZE))
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+ skb_free_frag(buf);
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+ else
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+ kfree(buf);
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+}
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+EXPORT_SYMBOL_GPL(hwbm_buf_free);
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+
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+/* Refill processing for HW buffer management */
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+int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp)
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+{
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+ int frag_size = bm_pool->frag_size;
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+ void *buf;
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+
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+ if (likely(frag_size <= PAGE_SIZE))
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+ buf = netdev_alloc_frag(frag_size);
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+ else
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+ buf = kmalloc(frag_size, gfp);
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+
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+ if (!buf)
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+ return -ENOMEM;
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+
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+ if (bm_pool->construct)
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+ if (bm_pool->construct(bm_pool, buf)) {
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+ hwbm_buf_free(bm_pool, buf);
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+ return -ENOMEM;
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(hwbm_pool_refill);
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+
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+int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp)
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+{
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+ int err, i;
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&bm_pool->lock, flags);
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+ if (bm_pool->buf_num == bm_pool->size) {
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+ pr_warn("pool already filled\n");
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+ return bm_pool->buf_num;
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+ }
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+
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+ if (buf_num + bm_pool->buf_num > bm_pool->size) {
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+ pr_warn("cannot allocate %d buffers for pool\n",
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+ buf_num);
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+ return 0;
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+ }
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+
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+ if ((buf_num + bm_pool->buf_num) < bm_pool->buf_num) {
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+ pr_warn("Adding %d buffers to the %d current buffers will overflow\n",
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+ buf_num, bm_pool->buf_num);
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+ return 0;
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+ }
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+
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+ for (i = 0; i < buf_num; i++) {
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+ err = hwbm_pool_refill(bm_pool, gfp);
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+ if (err < 0)
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+ break;
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+ }
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+
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+ /* Update BM driver with number of buffers added to pool */
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+ bm_pool->buf_num += i;
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+
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+ pr_debug("hwpm pool: %d of %d buffers added\n", i, buf_num);
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+ spin_unlock_irqrestore(&bm_pool->lock, flags);
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+
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+ return i;
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+}
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+EXPORT_SYMBOL_GPL(hwbm_pool_add);
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