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selftests: ublk: add test for checking zero copy related parameter

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ublk zero copy usually requires to set dma and segment parameter correctly,
so hard-code null target's dma & segment parameter in non-default value,
and verify if they are setup correctly by ublk driver.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250327095123.179113-12-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2025-03-27 17:51:20 +08:00 committed by Jens Axboe
parent 8c77861436
commit c78ae7b71e
3 changed files with 39 additions and 1 deletions
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1
tools/testing/selftests/ublk/Makefile
View File

@ -5,6 +5,7 @@ LDLIBS += -lpthread -lm -luring
TEST_PROGS := test_generic_01.sh
TEST_PROGS += test_generic_02.sh
TEST_PROGS += test_generic_03.sh
TEST_PROGS += test_null_01.sh
TEST_PROGS += test_null_02.sh

11
tools/testing/selftests/ublk/null.c
View File

@ -17,7 +17,8 @@ static int ublk_null_tgt_init(const struct dev_ctx *ctx, struct ublk_dev *dev)
dev->tgt.dev_size = dev_size;
dev->tgt.params = (struct ublk_params) {
.types = UBLK_PARAM_TYPE_BASIC,
.types = UBLK_PARAM_TYPE_BASIC | UBLK_PARAM_TYPE_DMA_ALIGN |
UBLK_PARAM_TYPE_SEGMENT,
.basic = {
.logical_bs_shift = 9,
.physical_bs_shift = 12,
@ -26,6 +27,14 @@ static int ublk_null_tgt_init(const struct dev_ctx *ctx, struct ublk_dev *dev)
.max_sectors = info->max_io_buf_bytes >> 9,
.dev_sectors = dev_size >> 9,
},
.dma = {
.alignment = 4095,
},
.seg = {
.seg_boundary_mask = 4095,
.max_segment_size = 32 << 10,
.max_segments = 32,
},
};
if (info->flags & UBLK_F_SUPPORT_ZERO_COPY)

28
tools/testing/selftests/ublk/test_generic_03.sh Executable file
View File

@ -0,0 +1,28 @@
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
TID="generic_03"
ERR_CODE=0
_prep_test "null" "check dma & segment limits for zero copy"
dev_id=$(_add_ublk_dev -t null -z)
_check_add_dev $TID $?
sysfs_path=/sys/block/ublkb"${dev_id}"
dma_align=$(cat "$sysfs_path"/queue/dma_alignment)
max_segments=$(cat "$sysfs_path"/queue/max_segments)
max_segment_size=$(cat "$sysfs_path"/queue/max_segment_size)
if [ "$dma_align" != "4095" ]; then
ERR_CODE=255
fi
if [ "$max_segments" != "32" ]; then
ERR_CODE=255
fi
if [ "$max_segment_size" != "32768" ]; then
ERR_CODE=255
fi
_cleanup_test "null"
_show_result $TID $ERR_CODE