--- /dev/null
+/**********************************************************************
+ * Author: Cavium Networks
+ *
+ * Contact: support@caviumnetworks.com
+ * This file is part of the OCTEON SDK
+ *
+ * Copyright (c) 2003-2010 Cavium Networks
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, Version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
+ * NONINFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * or visit http://www.gnu.org/licenses/.
+ *
+ * This file may also be available under a different license from Cavium.
+ * Contact Cavium Networks for more information
+**********************************************************************/
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+
+#include <asm/octeon/octeon.h>
+
+#include "ethernet-mem.h"
+#include "ethernet-defines.h"
+
+#include <asm/octeon/cvmx-fpa.h>
+
+/**
+ * cvm_oct_fill_hw_skbuff - fill the supplied hardware pool with skbuffs
+ * @pool: Pool to allocate an skbuff for
+ * @size: Size of the buffer needed for the pool
+ * @elements: Number of buffers to allocate
+ *
+ * Returns the actual number of buffers allocated.
+ */
+static int cvm_oct_fill_hw_skbuff(int pool, int size, int elements)
+{
+ int freed = elements;
+
+ while (freed) {
+ struct sk_buff *skb = dev_alloc_skb(size + 256);
+
+ if (unlikely(skb == NULL))
+ break;
+ skb_reserve(skb, 256 - (((unsigned long)skb->data) & 0x7f));
+ *(struct sk_buff **)(skb->data - sizeof(void *)) = skb;
+ cvmx_fpa_free(skb->data, pool, DONT_WRITEBACK(size / 128));
+ freed--;
+ }
+ return elements - freed;
+}
+
+/**
+ * cvm_oct_free_hw_skbuff- free hardware pool skbuffs
+ * @pool: Pool to allocate an skbuff for
+ * @size: Size of the buffer needed for the pool
+ * @elements: Number of buffers to allocate
+ */
+static void cvm_oct_free_hw_skbuff(int pool, int size, int elements)
+{
+ char *memory;
+
+ do {
+ memory = cvmx_fpa_alloc(pool);
+ if (memory) {
+ struct sk_buff *skb =
+ *(struct sk_buff **)(memory - sizeof(void *));
+ elements--;
+ dev_kfree_skb(skb);
+ }
+ } while (memory);
+
+ if (elements < 0)
+ pr_warn("Freeing of pool %u had too many skbuffs (%d)\n",
+ pool, elements);
+ else if (elements > 0)
+ pr_warn("Freeing of pool %u is missing %d skbuffs\n",
+ pool, elements);
+}
+
+/**
+ * cvm_oct_fill_hw_memory - fill a hardware pool with memory.
+ * @pool: Pool to populate
+ * @size: Size of each buffer in the pool
+ * @elements: Number of buffers to allocate
+ *
+ * Returns the actual number of buffers allocated.
+ */
+static int cvm_oct_fill_hw_memory(int pool, int size, int elements)
+{
+ char *memory;
+ char *fpa;
+ int freed = elements;
+
+ while (freed) {
+ /*
+ * FPA memory must be 128 byte aligned. Since we are
+ * aligning we need to save the original pointer so we
+ * can feed it to kfree when the memory is returned to
+ * the kernel.
+ *
+ * We allocate an extra 256 bytes to allow for
+ * alignment and space for the original pointer saved
+ * just before the block.
+ */
+ memory = kmalloc(size + 256, GFP_ATOMIC);
+ if (unlikely(memory == NULL)) {
+ pr_warn("Unable to allocate %u bytes for FPA pool %d\n",
+ elements * size, pool);
+ break;
+ }
+ fpa = (char *)(((unsigned long)memory + 256) & ~0x7fUL);
+ *((char **)fpa - 1) = memory;
+ cvmx_fpa_free(fpa, pool, 0);
+ freed--;
+ }
+ return elements - freed;
+}
+
+/**
+ * cvm_oct_free_hw_memory - Free memory allocated by cvm_oct_fill_hw_memory
+ * @pool: FPA pool to free
+ * @size: Size of each buffer in the pool
+ * @elements: Number of buffers that should be in the pool
+ */
+static void cvm_oct_free_hw_memory(int pool, int size, int elements)
+{
+ char *memory;
+ char *fpa;
+
+ do {
+ fpa = cvmx_fpa_alloc(pool);
+ if (fpa) {
+ elements--;
+ fpa = (char *)phys_to_virt(cvmx_ptr_to_phys(fpa));
+ memory = *((char **)fpa - 1);
+ kfree(memory);
+ }
+ } while (fpa);
+
+ if (elements < 0)
+ pr_warn("Freeing of pool %u had too many buffers (%d)\n",
+ pool, elements);
+ else if (elements > 0)
+ pr_warn("Warning: Freeing of pool %u is missing %d buffers\n",
+ pool, elements);
+}
+
+int cvm_oct_mem_fill_fpa(int pool, int size, int elements)
+{
+ int freed;
+
+ if (USE_SKBUFFS_IN_HW && pool == CVMX_FPA_PACKET_POOL)
+ freed = cvm_oct_fill_hw_skbuff(pool, size, elements);
+ else
+ freed = cvm_oct_fill_hw_memory(pool, size, elements);
+ return freed;
+}
+
+void cvm_oct_mem_empty_fpa(int pool, int size, int elements)
+{
+ if (USE_SKBUFFS_IN_HW && pool == CVMX_FPA_PACKET_POOL)
+ cvm_oct_free_hw_skbuff(pool, size, elements);
+ else
+ cvm_oct_free_hw_memory(pool, size, elements);
+}
Code Review / kvmfornfv.git / blobdiff