diff options
Diffstat (limited to 'drivers/staging/octeon/ethernet-mem.c')
| -rw-r--r-- | drivers/staging/octeon/ethernet-mem.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/staging/octeon/ethernet-mem.c b/drivers/staging/octeon/ethernet-mem.c new file mode 100644 index 000000000000..b595903e2af1 --- /dev/null +++ b/drivers/staging/octeon/ethernet-mem.c @@ -0,0 +1,198 @@ +/********************************************************************** + * Author: Cavium Networks + * + * Contact: support@caviumnetworks.com + * This file is part of the OCTEON SDK + * + * Copyright (c) 2003-2007 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/mii.h> +#include <net/dst.h> + +#include <asm/octeon/octeon.h> + +#include "ethernet-defines.h" + +#include "cvmx-fpa.h" + +/** + * 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 + */ +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 + 128); + if (unlikely(skb == NULL)) { + pr_warning + ("Failed to allocate skb for hardware pool %d\n", + pool); + break; + } + + skb_reserve(skb, 128 - (((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; +} + +/** + * Free the supplied hardware pool of 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_warning("Freeing of pool %u had too many skbuffs (%d)\n", + pool, elements); + else if (elements > 0) + pr_warning("Freeing of pool %u is missing %d skbuffs\n", + pool, elements); +} + +/** + * This function fills a hardware pool with memory. Depending + * on the config defines, this memory might come from the + * kernel or global 32bit memory allocated with + * cvmx_bootmem_alloc. + * + * @pool: Pool to populate + * @size: Size of each buffer in the pool + * @elements: Number of buffers to allocate + */ +static int cvm_oct_fill_hw_memory(int pool, int size, int elements) +{ + char *memory; + int freed = elements; + + if (USE_32BIT_SHARED) { + extern uint64_t octeon_reserve32_memory; + + memory = + cvmx_bootmem_alloc_range(elements * size, 128, + octeon_reserve32_memory, + octeon_reserve32_memory + + (CONFIG_CAVIUM_RESERVE32 << 20) - + 1); + if (memory == NULL) + panic("Unable to allocate %u bytes for FPA pool %d\n", + elements * size, pool); + + pr_notice("Memory range %p - %p reserved for " + "hardware\n", memory, + memory + elements * size - 1); + + while (freed) { + cvmx_fpa_free(memory, pool, 0); + memory += size; + freed--; + } + } else { + while (freed) { + /* We need to force alignment to 128 bytes here */ + memory = kmalloc(size + 127, GFP_ATOMIC); + if (unlikely(memory == NULL)) { + pr_warning("Unable to allocate %u bytes for " + "FPA pool %d\n", + elements * size, pool); + break; + } + memory = (char *)(((unsigned long)memory + 127) & -128); + cvmx_fpa_free(memory, pool, 0); + freed--; + } + } + return elements - freed; +} + +/** + * Free memory previously allocated with 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) +{ + if (USE_32BIT_SHARED) { + pr_warning("Warning: 32 shared memory is not freeable\n"); + } else { + char *memory; + do { + memory = cvmx_fpa_alloc(pool); + if (memory) { + elements--; + kfree(phys_to_virt(cvmx_ptr_to_phys(memory))); + } + } while (memory); + + if (elements < 0) + pr_warning("Freeing of pool %u had too many " + "buffers (%d)\n", + pool, elements); + else if (elements > 0) + pr_warning("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) + 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) + cvm_oct_free_hw_skbuff(pool, size, elements); + else + cvm_oct_free_hw_memory(pool, size, elements); +} |