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tests: net_buf: Add alignment tests

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Make sure that net_buf pools created by NET_BUF_POOL_VAR_ALIGN_DEFINE
are aligned according to user needs.

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
This commit is contained in:
Jukka Rissanen 2025-07-03 18:26:14 +03:00 committed by Anas Nashif
parent 45a0a4949d
commit fd0b14861d
1 changed files with 75 additions and 0 deletions
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75
tests/lib/net_buf/buf/src/main.c
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@ -67,11 +67,29 @@ static int destroy_called;
static void buf_destroy(struct net_buf *buf);
static void fixed_destroy(struct net_buf *buf);
static void var_destroy(struct net_buf *buf);
static void var_destroy_aligned(struct net_buf *buf);
static void var_destroy_aligned_small(struct net_buf *buf);
#define VAR_POOL_ALIGN 8
#define VAR_POOL_ALIGN_SMALL 4
#define VAR_POOL_DATA_COUNT 4
#define VAR_POOL_DATA_SIZE (VAR_POOL_DATA_COUNT * 64)
NET_BUF_POOL_HEAP_DEFINE(bufs_pool, 10, USER_DATA_HEAP, buf_destroy);
NET_BUF_POOL_FIXED_DEFINE(fixed_pool, 10, FIXED_BUFFER_SIZE, USER_DATA_FIXED, fixed_destroy);
NET_BUF_POOL_VAR_DEFINE(var_pool, 10, 1024, USER_DATA_VAR, var_destroy);
/* Two pools, one with aligned to 8 bytes and one with aligned to 4 bytes
* buffers. The aligned pools are used to test that the alignment works
* correctly.
*/
NET_BUF_POOL_VAR_ALIGN_DEFINE(var_pool_aligned, VAR_POOL_DATA_COUNT,
VAR_POOL_DATA_SIZE, USER_DATA_VAR,
var_destroy_aligned, VAR_POOL_ALIGN);
NET_BUF_POOL_VAR_ALIGN_DEFINE(var_pool_aligned_small, VAR_POOL_DATA_COUNT,
VAR_POOL_DATA_SIZE, USER_DATA_VAR,
var_destroy_aligned_small, VAR_POOL_ALIGN_SMALL);
static void buf_destroy(struct net_buf *buf)
{
struct net_buf_pool *pool = net_buf_pool_get(buf->pool_id);
@ -99,6 +117,24 @@ static void var_destroy(struct net_buf *buf)
net_buf_destroy(buf);
}
static void var_destroy_aligned(struct net_buf *buf)
{
struct net_buf_pool *pool = net_buf_pool_get(buf->pool_id);
destroy_called++;
zassert_equal(pool, &var_pool_aligned, "Invalid free pointer in buffer");
net_buf_destroy(buf);
}
static void var_destroy_aligned_small(struct net_buf *buf)
{
struct net_buf_pool *pool = net_buf_pool_get(buf->pool_id);
destroy_called++;
zassert_equal(pool, &var_pool_aligned_small, "Invalid free pointer in buffer");
net_buf_destroy(buf);
}
static const char example_data[] = "0123456789"
"abcdefghijklmnopqrstuvxyz"
"!#¤%&/()=?";
@ -1084,4 +1120,43 @@ ZTEST(net_buf_tests, test_net_buf_linearize)
zassert_equal(destroy_called, 4, "Incorrect destroy callback count");
}
ZTEST(net_buf_tests, test_net_buf_var_pool_aligned)
{
struct net_buf *buf1, *buf2, *buf3;
destroy_called = 0;
zassert_equal(var_pool_aligned.alloc->alignment, VAR_POOL_ALIGN,
"Expected %d-byte alignment for variable pool",
VAR_POOL_ALIGN);
buf1 = net_buf_alloc_len(&var_pool_aligned, 20, K_NO_WAIT);
zassert_not_null(buf1, "Failed to get buffer");
zassert_true(IS_ALIGNED((uintptr_t)buf1->data, VAR_POOL_ALIGN),
"Buffer data pointer is not aligned to %d bytes",
VAR_POOL_ALIGN);
buf2 = net_buf_alloc_len(&var_pool_aligned_small, 29, K_NO_WAIT);
zassert_not_null(buf2, "Failed to get buffer");
zassert_true(IS_ALIGNED((uintptr_t)buf2->data, VAR_POOL_ALIGN_SMALL),
"Buffer data pointer is not aligned to %d bytes",
VAR_POOL_ALIGN_SMALL);
buf3 = net_buf_alloc_len(&var_pool_aligned, VAR_POOL_ALIGN_SMALL, K_NO_WAIT);
zassert_is_null(buf3,
"Managed to get buffer even if alignment %d is larger than size %d",
VAR_POOL_ALIGN, VAR_POOL_ALIGN_SMALL);
buf3 = net_buf_alloc_len(&var_pool_aligned, VAR_POOL_ALIGN, K_NO_WAIT);
zassert_not_null(buf3, "Failed to get buffer");
net_buf_unref(buf1);
net_buf_unref(buf2);
net_buf_unref(buf3);
zassert_equal(destroy_called, 3, "Incorrect destroy callback count");
}
ZTEST_SUITE(net_buf_tests, NULL, NULL, NULL, NULL, NULL);