/*-
* BSD LICENSE
- *
+ *
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
- *
+ *
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
- *
+ *
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
- *
+ *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
*
* This bitmap is not thread safe. For lock free operation on a specific bitmap
* instance, a single writer thread performing bit set/clear operations is
- * allowed, only the writer thread can do bitmap scan operations, while there
+ * allowed, only the writer thread can do bitmap scan operations, while there
* can be several reader threads performing bit get operations in parallel with
- * the writer thread. When the use of locking primitives is acceptable, the
+ * the writer thread. When the use of locking primitives is acceptable, the
* serialization of the bit set/clear and bitmap scan operations needs to be
* enforced by the caller, while the bit get operation does not require locking
* the bitmap.
*
***/
-
+
#include <rte_common.h>
#include <rte_debug.h>
#include <rte_memory.h>
uint64_t *array2; /**< Bitmap array2 */
uint32_t array1_size; /**< Number of 64-bit slabs in array1 that are actually used */
uint32_t array2_size; /**< Number of 64-bit slabs in array2 */
-
+
/* Context for the "scan next" operation */
uint32_t index1; /**< Bitmap scan: Index of current array1 slab */
uint32_t offset1; /**< Bitmap scan: Offset of current bit within current array1 slab */
uint32_t index2; /**< Bitmap scan: Index of current array2 slab */
uint32_t go2; /**< Bitmap scan: Go/stop condition for current array2 cache line */
-
+
/* Storage space for array1 and array2 */
uint8_t memory[0];
};
#if RTE_BITMAP_OPTIMIZATIONS
-static inline int
+static inline int
rte_bsf64(uint64_t slab, uint32_t *pos)
{
if (likely(slab == 0)) {
#else
-static inline int
+static inline int
rte_bsf64(uint64_t slab, uint32_t *pos)
{
uint64_t mask;
uint32_t i;
-
+
if (likely(slab == 0)) {
return 0;
}
return 1;
}
}
-
+
return 0;
}
#endif
static inline uint32_t
-__rte_bitmap_get_memory_footprint(uint32_t n_bits,
+__rte_bitmap_get_memory_footprint(uint32_t n_bits,
uint32_t *array1_byte_offset, uint32_t *array1_slabs,
uint32_t *array2_byte_offset, uint32_t *array2_slabs)
{
uint32_t n_slabs_context, n_slabs_array1, n_cache_lines_context_and_array1;
uint32_t n_cache_lines_array2;
uint32_t n_bytes_total;
-
+
n_cache_lines_array2 = (n_bits + RTE_BITMAP_CL_BIT_SIZE - 1) / RTE_BITMAP_CL_BIT_SIZE;
n_slabs_array1 = (n_cache_lines_array2 + RTE_BITMAP_SLAB_BIT_SIZE - 1) / RTE_BITMAP_SLAB_BIT_SIZE;
n_slabs_array1 = rte_align32pow2(n_slabs_array1);
n_slabs_context = (sizeof(struct rte_bitmap) + (RTE_BITMAP_SLAB_BIT_SIZE / 8) - 1) / (RTE_BITMAP_SLAB_BIT_SIZE / 8);
n_cache_lines_context_and_array1 = (n_slabs_context + n_slabs_array1 + RTE_BITMAP_CL_SLAB_SIZE - 1) / RTE_BITMAP_CL_SLAB_SIZE;
n_bytes_total = (n_cache_lines_context_and_array1 + n_cache_lines_array2) * CACHE_LINE_SIZE;
-
+
if (array1_byte_offset) {
*array1_byte_offset = n_slabs_context * (RTE_BITMAP_SLAB_BIT_SIZE / 8);
}
if (array2_slabs) {
*array2_slabs = n_cache_lines_array2 * RTE_BITMAP_CL_SLAB_SIZE;
}
-
+
return n_bytes_total;
}
if (n_bits == 0) {
return 0;
}
-
+
return __rte_bitmap_get_memory_footprint(n_bits, NULL, NULL, NULL, NULL);
}
* @return
* 0 upon success, error code otherwise
*/
-static inline struct rte_bitmap *
+static inline struct rte_bitmap *
rte_bitmap_init(uint32_t n_bits, uint8_t *mem, uint32_t mem_size)
{
struct rte_bitmap *bmp;
if (n_bits == 0) {
return NULL;
}
-
+
if ((mem == NULL) || (((uintptr_t) mem) & CACHE_LINE_MASK)) {
return NULL;
}
-
- size = __rte_bitmap_get_memory_footprint(n_bits,
- &array1_byte_offset, &array1_slabs,
+
+ size = __rte_bitmap_get_memory_footprint(n_bits,
+ &array1_byte_offset, &array1_slabs,
&array2_byte_offset, &array2_slabs);
if (size < mem_size) {
return NULL;
}
-
+
/* Setup bitmap */
memset(mem, 0, size);
bmp = (struct rte_bitmap *) mem;
bmp->array1_size = array1_slabs;
bmp->array2 = (uint64_t *) &mem[array2_byte_offset];
bmp->array2_size = array2_slabs;
-
+
__rte_bitmap_scan_init(bmp);
-
+
return bmp;
}
if (bmp == NULL) {
return -1;
}
-
+
return 0;
}
{
uint64_t *slab2;
uint32_t index2;
-
+
index2 = pos >> RTE_BITMAP_SLAB_BIT_SIZE_LOG2;
slab2 = bmp->array2 + index2;
rte_prefetch0((void *) slab2);
{
uint64_t *slab2;
uint32_t index2, offset2;
-
+
index2 = pos >> RTE_BITMAP_SLAB_BIT_SIZE_LOG2;
offset2 = pos & RTE_BITMAP_SLAB_BIT_MASK;
slab2 = bmp->array2 + index2;
{
uint64_t *slab1, *slab2;
uint32_t index1, index2, offset1, offset2;
-
+
/* Set bit in array2 slab and set bit in array1 slab */
index2 = pos >> RTE_BITMAP_SLAB_BIT_SIZE_LOG2;
offset2 = pos & RTE_BITMAP_SLAB_BIT_MASK;
offset1 = (pos >> RTE_BITMAP_CL_BIT_SIZE_LOG2) & RTE_BITMAP_SLAB_BIT_MASK;
slab2 = bmp->array2 + index2;
slab1 = bmp->array1 + index1;
-
+
*slab2 |= 1lu << offset2;
*slab1 |= 1lu << offset1;
}
{
uint64_t *slab1, *slab2;
uint32_t index1, index2, offset1;
-
+
/* Set bits in array2 slab and set bit in array1 slab */
index2 = pos >> RTE_BITMAP_SLAB_BIT_SIZE_LOG2;
index1 = pos >> (RTE_BITMAP_SLAB_BIT_SIZE_LOG2 + RTE_BITMAP_CL_BIT_SIZE_LOG2);
offset1 = (pos >> RTE_BITMAP_CL_BIT_SIZE_LOG2) & RTE_BITMAP_SLAB_BIT_MASK;
slab2 = bmp->array2 + index2;
slab1 = bmp->array1 + index1;
-
+
*slab2 |= slab;
*slab1 |= 1lu << offset1;
}
__rte_bitmap_line_not_empty(uint64_t *slab2)
{
uint64_t v1, v2, v3, v4;
-
+
v1 = slab2[0] | slab2[1];
v2 = slab2[2] | slab2[3];
v3 = slab2[4] | slab2[5];
v4 = slab2[6] | slab2[7];
v1 |= v2;
v3 |= v4;
-
+
return (v1 | v3);
}
index2 = pos >> RTE_BITMAP_SLAB_BIT_SIZE_LOG2;
offset2 = pos & RTE_BITMAP_SLAB_BIT_MASK;
slab2 = bmp->array2 + index2;
-
+
/* Return if array2 slab is not all-zeros */
*slab2 &= ~(1lu << offset2);
if (*slab2){
return;
}
-
+
/* Check the entire cache line of array2 for all-zeros */
index2 &= ~ RTE_BITMAP_CL_SLAB_MASK;
slab2 = bmp->array2 + index2;
if (__rte_bitmap_line_not_empty(slab2)) {
return;
}
-
+
/* The array2 cache line is all-zeros, so clear bit in array1 slab */
index1 = pos >> (RTE_BITMAP_SLAB_BIT_SIZE_LOG2 + RTE_BITMAP_CL_BIT_SIZE_LOG2);
offset1 = (pos >> RTE_BITMAP_CL_BIT_SIZE_LOG2) & RTE_BITMAP_SLAB_BIT_MASK;
{
uint64_t value1;
uint32_t i;
-
+
/* Check current array1 slab */
value1 = bmp->array1[bmp->index1];
value1 &= __rte_bitmap_mask1_get(bmp);
-
+
if (rte_bsf64(value1, &bmp->offset1)) {
return 1;
}
-
+
__rte_bitmap_index1_inc(bmp);
bmp->offset1 = 0;
-
+
/* Look for another array1 slab */
for (i = 0; i < bmp->array1_size; i ++, __rte_bitmap_index1_inc(bmp)) {
value1 = bmp->array1[bmp->index1];
-
+
if (rte_bsf64(value1, &bmp->offset1)) {
return 1;
}
}
-
+
return 0;
}
__rte_bitmap_scan_read(struct rte_bitmap *bmp, uint32_t *pos, uint64_t *slab)
{
uint64_t *slab2;
-
+
slab2 = bmp->array2 + bmp->index2;
for ( ; bmp->go2 ; bmp->index2 ++, slab2 ++, bmp->go2 = bmp->index2 & RTE_BITMAP_CL_SLAB_MASK) {
if (*slab2) {
*pos = bmp->index2 << RTE_BITMAP_SLAB_BIT_SIZE_LOG2;
*slab = *slab2;
-
+
bmp->index2 ++;
slab2 ++;
bmp->go2 = bmp->index2 & RTE_BITMAP_CL_SLAB_MASK;
return 1;
}
}
-
+
return 0;
}
* @param slab
* When function call returns 1, slab contains the value of the entire 64-bit
* slab where the bit indicated by pos is located. Slabs are always 64-bit
- * aligned, so the position of the first bit of the slab (this bit is not
+ * aligned, so the position of the first bit of the slab (this bit is not
* necessarily set) is pos / 64. Once a slab has been returned by the bitmap
* scan operation, the internal pointers of the bitmap are updated to point
- * after this slab, so the same slab will not be returned again if it
+ * after this slab, so the same slab will not be returned again if it
* contains more than one bit which is set. When function call returns 0,
* slab is not modified.
* @return
if (__rte_bitmap_scan_read(bmp, pos, slab)) {
return 1;
}
-
+
/* Look for non-empty array2 line */
if (__rte_bitmap_scan_search(bmp)) {
__rte_bitmap_scan_read_init(bmp);
__rte_bitmap_scan_read(bmp, pos, slab);
return 1;
}
-
+
/* Empty bitmap */
return 0;
}
git.droids-corp.org / dpdk.git / blobdiff