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-rw-r--r--src/plugins/unittest/svm_fifo_test.c19
-rw-r--r--src/svm/fifo_segment.c79
-rw-r--r--src/svm/fifo_types.h19
-rw-r--r--src/svm/svm_fifo.h2
4 files changed, 62 insertions, 57 deletions
diff --git a/src/plugins/unittest/svm_fifo_test.c b/src/plugins/unittest/svm_fifo_test.c
index a223e132d3d..6adba7e8e59 100644
--- a/src/plugins/unittest/svm_fifo_test.c
+++ b/src/plugins/unittest/svm_fifo_test.c
@@ -2103,6 +2103,7 @@ sfifo_test_fifo_segment_hello_world (int verbose)
clib_memset (a, 0, sizeof (*a));
a->segment_name = "fifo-test1";
a->segment_size = 256 << 10;
+ a->segment_type = SSVM_SEGMENT_PRIVATE;
rv = fifo_segment_create (sm, a);
SFIFO_TEST (!rv, "svm_fifo_segment_create returned %d", rv);
@@ -2153,6 +2154,9 @@ sfifo_test_fifo_segment_fifo_grow (int verbose)
a->segment_name = "fifo-test1";
/* size chosen to be able to force multi chunk allocation lower */
a->segment_size = 256 << 10;
+ /* overhead that reduces the amount of space dedicated to fifos */
+ a->segment_size += 1 << 14;
+ a->segment_type = SSVM_SEGMENT_PRIVATE;
/* fifo allocation allocates chunks in batch */
n_batch = FIFO_SEGMENT_ALLOC_BATCH_SIZE;
@@ -2490,6 +2494,7 @@ sfifo_test_fifo_segment_mempig (int verbose)
a->segment_name = "fifo-test1";
a->segment_size = 256 << 10;
+ a->segment_type = SSVM_SEGMENT_PRIVATE;
rv = fifo_segment_create (sm, a);
@@ -2546,18 +2551,21 @@ approx_leq (uword a, uword b, u32 margin)
static int
sfifo_test_fifo_segment_prealloc (int verbose)
{
+ u32 max_pairs, pairs_req, free_space, pair_mem, overhead;
fifo_segment_create_args_t _a, *a = &_a;
fifo_segment_main_t *sm = &segment_main;
- u32 max_pairs, pairs_req, free_space, pair_mem;
svm_fifo_t *f, *tf, *old;
fifo_segment_t *fs;
int rv, alloc;
clib_memset (a, 0, sizeof (*a));
+ /* Overhead due to segment internal headers and offsets. The magic 384
+ * bytes are the fsh->n_reserved_bytes after seg init */
+ overhead = (8 << 10) + 384;
a->segment_name = "fifo-test-prealloc";
- a->segment_size = 256 << 10;
- a->segment_type = SSVM_SEGMENT_MEMFD;
+ a->segment_size = (256 << 10) + overhead;
+ a->segment_type = SSVM_SEGMENT_PRIVATE;
rv = fifo_segment_create (sm, a);
SFIFO_TEST (!rv, "svm_fifo_segment_create returned %d", rv);
@@ -2568,7 +2576,7 @@ sfifo_test_fifo_segment_prealloc (int verbose)
* Prealloc chunks and headers
*/
free_space = fifo_segment_free_bytes (fs);
- SFIFO_TEST (free_space <= 256 << 10, "free space expected %u is %u",
+ SFIFO_TEST (free_space - 4096 <= 256 << 10, "free space expected %u is %u",
256 << 10, free_space);
rv = fifo_segment_prealloc_fifo_chunks (fs, 0, 4096, 50);
SFIFO_TEST (rv == 0, "chunk prealloc should work");
@@ -2591,7 +2599,7 @@ sfifo_test_fifo_segment_prealloc (int verbose)
rv = fifo_segment_free_bytes (fs);
free_space -= sizeof (svm_fifo_t) * 50;
/* Memory alloc alignment accounts for the difference */
- SFIFO_TEST (approx_leq (free_space, rv, 16), "free space expected %u is %u",
+ SFIFO_TEST (approx_leq (free_space, rv, 128), "free space expected %u is %u",
free_space, rv);
free_space = rv;
@@ -2666,7 +2674,6 @@ sfifo_test_fifo_segment_prealloc (int verbose)
*/
fifo_segment_free_fifo (fs, old);
fifo_segment_free_fifo (fs, tf);
- close (fs->ssvm.fd);
fifo_segment_delete (sm, fs);
return 0;
}
diff --git a/src/svm/fifo_segment.c b/src/svm/fifo_segment.c
index d474b85f03b..b4c3cbe6c6d 100644
--- a/src/svm/fifo_segment.c
+++ b/src/svm/fifo_segment.c
@@ -143,7 +143,7 @@ fss_chunk_freelist_unlock (fifo_segment_slice_t *fss)
static inline int
fss_chunk_fl_index_is_valid (fifo_segment_slice_t * fss, u32 fl_index)
{
- return (fl_index < fss->n_chunk_lens);
+ return (fl_index < FS_CHUNK_VEC_LEN);
}
static void
@@ -239,57 +239,37 @@ fss_fl_chunk_bytes_sub (fifo_segment_slice_t * fss, uword size)
int
fifo_segment_init (fifo_segment_t * fs)
{
- u32 max_chunk_sz, align = 8, offset = 2 * 4096, vec_sz;
- uword max_fifo, seg_start, seg_size;
+ u32 align = 8, offset = 2 * 4096, slices_sz;
+ uword max_fifo, seg_start, seg_sz;
fifo_segment_header_t *fsh;
- fifo_segment_slice_t *fss;
ssvm_shared_header_t *sh;
void *seg_data;
- int i;
/* TODO remove ssvm heap entirely */
sh = fs->ssvm.sh;
seg_data = (u8 *) sh + offset;
- seg_size = sh->ssvm_size - offset;
+ seg_sz = sh->ssvm_size - offset;
+
+ fs->n_slices = clib_max (fs->n_slices, 1);
+ slices_sz = sizeof (fifo_segment_slice_t) * fs->n_slices;
seg_start = round_pow2_u64 (pointer_to_uword (seg_data), align);
fsh = uword_to_pointer (seg_start, void *);
- memset (fsh, 0, sizeof (*fsh));
- fsh->byte_index = sizeof (*fsh);
- fsh->max_byte_index = seg_size;
- fs->max_byte_index = fsh->max_byte_index;
- ASSERT (fsh->max_byte_index <= sh->ssvm_va + sh->ssvm_size);
-
- fs->h = sh->opaque[0] = fsh;
- fs->n_slices = clib_max (fs->n_slices, 1);
+ memset (fsh, 0, sizeof (*fsh) + slices_sz);
+ fsh->byte_index = sizeof (*fsh) + slices_sz;
+ fsh->max_byte_index = seg_sz;
fsh->n_slices = fs->n_slices;
- max_fifo =
- clib_min ((fsh_n_free_bytes (fsh) - 4096) / 2, FIFO_SEGMENT_MAX_FIFO_SIZE);
- fsh->max_log2_chunk_size = max_log2 (max_fifo);
-
- fsh->slices = fsh_alloc (fsh, sizeof (*fss) * fs->n_slices);
- memset (fsh->slices, 0, sizeof (*fss) * fs->n_slices);
- max_chunk_sz = fsh->max_log2_chunk_size - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE;
- max_chunk_sz += 1;
-
- for (i = 0; i < fs->n_slices; i++)
- {
- fss = fsh_slice_get (fsh, i);
- vec_sz = max_chunk_sz * sizeof (*fss->free_chunks);
- fss->free_chunks = fsh_alloc (fsh, vec_sz);
- memset (fss->free_chunks, 0, vec_sz);
- vec_sz = max_chunk_sz * sizeof (*fss->num_chunks);
- fss->num_chunks = fsh_alloc (fsh, vec_sz);
- memset (fss->num_chunks, 0, vec_sz);
-
- fss->chunk_lock = 0;
- fss->n_chunk_lens = max_chunk_sz;
- }
-
+ max_fifo = clib_min ((seg_sz - slices_sz) / 2, FIFO_SEGMENT_MAX_FIFO_SIZE);
+ fsh->max_log2_fifo_size = min_log2 (max_fifo);
fsh->n_cached_bytes = 0;
fsh->n_reserved_bytes = fsh->byte_index;
+ ASSERT (fsh->max_byte_index <= sh->ssvm_size - offset);
+
+ fs->max_byte_index = fsh->max_byte_index;
+ fs->h = sh->opaque[0] = fsh;
+
sh->ready = 1;
return (0);
}
@@ -334,6 +314,7 @@ fifo_segment_create (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
int
fifo_segment_attach (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
{
+ fifo_segment_header_t *fsh;
fifo_segment_t *fs;
int rv;
@@ -355,8 +336,15 @@ fifo_segment_attach (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
}
/* Fish the segment header */
- fs->h = fs->ssvm.sh->opaque[0];
+ fsh = fs->h = fs->ssvm.sh->opaque[0];
+
+ /* Probably a segment without fifos */
+ if (!fsh)
+ goto done;
+ fs->max_byte_index = fsh->max_byte_index;
+
+done:
vec_add1 (a->new_segment_indices, fs - sm->segments);
return (0);
}
@@ -401,7 +389,8 @@ fs_freelist_for_size (u32 size)
{
if (PREDICT_FALSE (size < FIFO_SEGMENT_MIN_FIFO_SIZE))
return 0;
- return max_log2 (size) - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE;
+ return clib_min (max_log2 (size) - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE,
+ FS_CHUNK_VEC_LEN - 1);
}
static inline u32
@@ -417,8 +406,8 @@ fs_chunk_size_is_valid (fifo_segment_header_t * fsh, u32 size)
* 4K minimum. It's not likely that anything good will happen
* with a smaller FIFO.
*/
- return size >= FIFO_SEGMENT_MIN_FIFO_SIZE
- && size <= (1ULL << fsh->max_log2_chunk_size);
+ return size >= FIFO_SEGMENT_MIN_FIFO_SIZE &&
+ size <= (1ULL << fsh->max_log2_fifo_size);
}
svm_fifo_chunk_t *
@@ -744,7 +733,7 @@ fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs, u32 slice_index,
ASSERT (slice_index < fs->n_slices);
- if (PREDICT_FALSE (data_bytes > 1 << fsh->max_log2_chunk_size))
+ if (PREDICT_FALSE (data_bytes > 1 << fsh->max_log2_fifo_size))
return 0;
fss = fsh_slice_get (fsh, slice_index);
@@ -1018,7 +1007,7 @@ fs_slice_num_free_chunks (fifo_segment_slice_t * fss, u32 size)
/* Count all free chunks? */
if (size == ~0)
{
- for (i = 0; i < fss->n_chunk_lens; i++)
+ for (i = 0; i < FS_CHUNK_VEC_LEN; i++)
{
c = fss->free_chunks[i];
if (c == 0)
@@ -1036,7 +1025,7 @@ fs_slice_num_free_chunks (fifo_segment_slice_t * fss, u32 size)
rounded_size = (1 << (max_log2 (size)));
fl_index = fs_freelist_for_size (rounded_size);
- if (fl_index >= fss->n_chunk_lens)
+ if (fl_index >= FS_CHUNK_VEC_LEN)
return 0;
c = fss->free_chunks[fl_index];
@@ -1267,7 +1256,7 @@ format_fifo_segment (u8 * s, va_list * args)
for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
{
fss = fsh_slice_get (fsh, slice_index);
- for (i = 0; i < fss->n_chunk_lens; i++)
+ for (i = 0; i < FS_CHUNK_VEC_LEN; i++)
{
c = fss->free_chunks[i];
if (c == 0 && fss->num_chunks[i] == 0)
diff --git a/src/svm/fifo_types.h b/src/svm/fifo_types.h
index 9182a2ac3cf..e839e7eaab7 100644
--- a/src/svm/fifo_types.h
+++ b/src/svm/fifo_types.h
@@ -21,6 +21,14 @@
#include <vppinfra/rbtree.h>
#include <vppinfra/lock.h>
+#define FS_MIN_LOG2_CHUNK_SZ 12 /**< also min fifo size */
+#define FS_MAX_LOG2_CHUNK_SZ 22 /**< 4MB max chunk size */
+#define FS_CHUNK_VEC_LEN 11 /**< number of chunk sizes */
+
+STATIC_ASSERT ((FS_MAX_LOG2_CHUNK_SZ - FS_MIN_LOG2_CHUNK_SZ) ==
+ FS_CHUNK_VEC_LEN - 1,
+ "update chunk sizes");
+
#define SVM_FIFO_TRACE (0)
#define SVM_FIFO_MAX_EVT_SUBSCRIBERS 7
@@ -101,24 +109,23 @@ typedef struct _svm_fifo
typedef struct fifo_segment_slice_
{
+ svm_fifo_chunk_t *free_chunks[FS_CHUNK_VEC_LEN]; /**< Free chunks by size */
svm_fifo_t *fifos; /**< Linked list of active RX fifos */
svm_fifo_t *free_fifos; /**< Freelists by fifo size */
- svm_fifo_chunk_t **free_chunks; /**< Freelists by chunk size */
- u32 *num_chunks; /**< Allocated chunks by chunk size */
uword n_fl_chunk_bytes; /**< Chunk bytes on freelist */
uword virtual_mem; /**< Slice sum of all fifo sizes */
- u32 n_chunk_lens;
+ u32 num_chunks[FS_CHUNK_VEC_LEN]; /**< Allocated chunks by chunk size */
+
CLIB_CACHE_LINE_ALIGN_MARK (lock);
u32 chunk_lock;
} fifo_segment_slice_t;
struct fifo_segment_header_
{
- fifo_segment_slice_t *slices; /** Fixed array of slices */
uword n_cached_bytes; /**< Cached bytes */
u32 n_active_fifos; /**< Number of active fifos */
u32 n_reserved_bytes; /**< Bytes not to be allocated */
- u32 max_log2_chunk_size; /**< Max log2(chunk size) for fs */
+ u32 max_log2_fifo_size; /**< Max log2(chunk size) for fs */
u8 flags; /**< Segment flags */
u8 n_slices; /**< Number of slices */
u8 high_watermark; /**< Memory pressure watermark high */
@@ -127,6 +134,8 @@ struct fifo_segment_header_
CLIB_CACHE_LINE_ALIGN_MARK (allocator);
uword byte_index;
uword max_byte_index;
+ CLIB_CACHE_LINE_ALIGN_MARK (slice);
+ fifo_segment_slice_t slices[0]; /** Fixed array of slices */
};
void fsh_virtual_mem_update (fifo_segment_header_t * fsh, u32 slice_index,
diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h
index 2a054526865..5656e63d998 100644
--- a/src/svm/svm_fifo.h
+++ b/src/svm/svm_fifo.h
@@ -712,7 +712,7 @@ svm_fifo_size (svm_fifo_t * f)
static inline void
svm_fifo_set_size (svm_fifo_t * f, u32 size)
{
- if (size > (1 << f->fs_hdr->max_log2_chunk_size))
+ if (size > (1 << f->fs_hdr->max_log2_fifo_size))
return;
fsh_virtual_mem_update (f->fs_hdr, f->slice_index, (int) f->size - size);
f->size = size;