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bdev: add API function to get buffer alignment

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Change-Id: I4c7eff4c903411994fc6bb9fae98f967eb14669c
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Daniel Verkamp 2017-05-09 10:57:32 -07:00
parent 68be2e2842
commit 6a8cd333a9
3 changed files with 28 additions and 4 deletions
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8
include/spdk/bdev.h
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@ -199,6 +199,14 @@ bool spdk_bdev_io_type_supported(struct spdk_bdev *bdev, enum spdk_bdev_io_type
int spdk_bdev_dump_config_json(struct spdk_bdev *bdev, struct spdk_json_write_ctx *w);
/**
* Get minimum I/O buffer address alignment for a bdev.
*
* \param bdev Block device to query.
* \return Required alignment of I/O buffers in bytes.
*/
size_t spdk_bdev_get_buf_align(const struct spdk_bdev *bdev);
struct spdk_bdev_io *spdk_bdev_read(struct spdk_bdev *bdev, struct spdk_io_channel *ch,
void *buf, uint64_t offset, uint64_t nbytes,
spdk_bdev_io_completion_cb cb, void *cb_arg);

11
lib/bdev/bdev.c
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@ -532,6 +532,17 @@ spdk_bdev_get_io_channel(struct spdk_bdev *bdev, uint32_t priority)
return spdk_get_io_channel(bdev, priority, false, NULL);
}
size_t
spdk_bdev_get_buf_align(const struct spdk_bdev *bdev)
{
/* TODO: push this logic down to the bdev modules */
if (bdev->need_aligned_buffer) {
return bdev->blocklen;
}
return 1;
}
static int
spdk_bdev_io_valid(struct spdk_bdev *bdev, uint64_t offset, uint64_t nbytes)
{

13
test/lib/bdev/bdevperf/bdevperf.c
View File

@ -44,6 +44,7 @@
#include "spdk/env.h"
#include "spdk/event.h"
#include "spdk/log.h"
#include "spdk/util.h"
#include "spdk/io_channel.h"
struct bdevperf_task {
@ -96,7 +97,7 @@ static int g_target_count = 0;
* require alignment based on block length - for example,
* AIO blockdevs.
*/
static uint32_t g_min_alignment = 8;
static size_t g_min_alignment = 8;
static void
blockdev_heads_init(void)
@ -114,6 +115,7 @@ bdevperf_construct_targets(void)
int index = 0;
struct spdk_bdev *bdev;
struct io_target *target;
size_t align;
bdev = spdk_bdev_first();
while (bdev != NULL) {
@ -145,9 +147,12 @@ bdevperf_construct_targets(void)
target->offset_in_ios = 0;
target->size_in_ios = (bdev->blockcnt * bdev->blocklen) /
g_io_size;
if (bdev->need_aligned_buffer && g_min_alignment < bdev->blocklen) {
g_min_alignment = bdev->blocklen;
}
align = spdk_bdev_get_buf_align(bdev);
/*
* TODO: This should actually use the LCM of align and g_min_alignment, but
* it is fairly safe to assume all alignments are powers of two for now.
*/
g_min_alignment = spdk_max(g_min_alignment, align);
target->is_draining = false;
target->run_timer = NULL;