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bdev: add API to get optimal I/O boundary

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Allow passing the NVMe namespace optimal I/O boundary through the bdev
layer.

Change-Id: I27a2d5498df56775d3330e40c31bd7c23bbc77a5
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/374532
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Daniel Verkamp 2017-08-16 13:56:10 -07:00
parent e5f6a99b61
commit 45d4b1973a
4 changed files with 21 additions and 0 deletions
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9
include/spdk/bdev.h
View File

@ -219,6 +219,15 @@ uint64_t spdk_bdev_get_num_blocks(const struct spdk_bdev *bdev);
*/
size_t spdk_bdev_get_buf_align(const struct spdk_bdev *bdev);
/**
* Get optimal I/O boundary for a bdev.
*
* \param bdev Block device to query.
* \return Optimal I/O boundary in blocks that should not be crossed for best performance, or 0 if
* no optimal boundary is reported.
*/
uint32_t spdk_bdev_get_optimal_io_boundary(const struct spdk_bdev *bdev);
/**
* Query whether block device has an enabled write cache.
*

5
include/spdk_internal/bdev.h
View File

@ -192,6 +192,11 @@ struct spdk_bdev {
*/
int need_aligned_buffer;
/**
* Optimal I/O boundary in blocks, or 0 for no value reported.
*/
uint32_t optimal_io_boundary;
/**
* Pointer to the bdev module that registered this bdev.
*/

6
lib/bdev/bdev.c
View File

@ -740,6 +740,12 @@ spdk_bdev_get_buf_align(const struct spdk_bdev *bdev)
return 1;
}
uint32_t
spdk_bdev_get_optimal_io_boundary(const struct spdk_bdev *bdev)
{
return bdev->optimal_io_boundary;
}
bool
spdk_bdev_has_write_cache(const struct spdk_bdev *bdev)
{

1
lib/bdev/nvme/bdev_nvme.c
View File

@ -1138,6 +1138,7 @@ nvme_ctrlr_create_bdevs(struct nvme_ctrlr *nvme_ctrlr)
}
bdev->disk.blocklen = spdk_nvme_ns_get_sector_size(ns);
bdev->disk.blockcnt = spdk_nvme_ns_get_num_sectors(ns);
bdev->disk.optimal_io_boundary = spdk_nvme_ns_get_optimal_io_boundary(ns);
bdev->disk.ctxt = bdev;
bdev->disk.fn_table = &nvmelib_fn_table;
bdev->disk.module = SPDK_GET_BDEV_MODULE(nvme);