blob: 815c5a29e8dbc59f86fef3ae013ed998d954b0ba [file] [log] [blame]
/*
* Copyright (c) 2016-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <svm/fifo_segment.h>
static inline fifo_segment_slice_t *
fsh_slice_get (fifo_segment_header_t * fsh, u32 slice_index)
{
return &fsh->slices[slice_index];
}
static char *fifo_segment_mem_status_strings[] = {
#define _(sym,str) str,
foreach_segment_mem_status
#undef _
};
/**
* Fifo segment free space
*
* Queries the underlying memory manager, dlmalloc, for free space. Since this
* ends up walking the internal data structures, it should not be called
* indiscriminately.
*
* @param fs fifo segment
* @return number of free bytes
*/
static uword
fsh_free_space (fifo_segment_header_t * fsh)
{
return clib_mem_get_heap_free_space (fsh->ssvm_sh->heap);
}
static inline void
fsh_free_bytes_sub (fifo_segment_header_t * fsh, int size)
{
clib_atomic_fetch_sub_rel (&fsh->n_free_bytes, size);
}
static inline uword
fsh_n_free_bytes (fifo_segment_header_t * fsh)
{
uword n_free = clib_atomic_load_relax_n (&fsh->n_free_bytes);
return n_free > fsh->n_reserved_bytes ? n_free - fsh->n_reserved_bytes : 0;
}
static inline void
fsh_update_free_bytes (fifo_segment_header_t * fsh)
{
clib_atomic_store_rel_n (&fsh->n_free_bytes, fsh_free_space (fsh));
}
static inline void
fsh_cached_bytes_add (fifo_segment_header_t * fsh, uword size)
{
clib_atomic_fetch_add_rel (&fsh->n_cached_bytes, size);
}
static inline void
fsh_cached_bytes_sub (fifo_segment_header_t * fsh, uword size)
{
clib_atomic_fetch_sub_rel (&fsh->n_cached_bytes, size);
}
static inline uword
fsh_n_cached_bytes (fifo_segment_header_t * fsh)
{
uword n_cached = clib_atomic_load_relax_n (&fsh->n_cached_bytes);
return n_cached;
}
static inline void
fsh_active_fifos_update (fifo_segment_header_t * fsh, int inc)
{
clib_atomic_fetch_add_rel (&fsh->n_active_fifos, inc);
}
static inline u32
fsh_n_active_fifos (fifo_segment_header_t * fsh)
{
return clib_atomic_load_relax_n (&fsh->n_active_fifos);
}
static inline uword
fsh_virtual_mem (fifo_segment_header_t * fsh)
{
fifo_segment_slice_t *fss;
uword total_vm = 0;
int i;
for (i = 0; i < fsh->n_slices; i++)
{
fss = fsh_slice_get (fsh, i);
total_vm += clib_atomic_load_relax_n (&fss->virtual_mem);
}
return total_vm;
}
void
fsh_virtual_mem_update (fifo_segment_header_t * fsh, u32 slice_index,
int n_bytes)
{
fifo_segment_slice_t *fss = fsh_slice_get (fsh, slice_index);
fss->virtual_mem += n_bytes;
}
static void
fsh_check_mem (fifo_segment_header_t * fsh)
{
uword thresh;
if (fsh->flags & FIFO_SEGMENT_F_MEM_LIMIT)
return;
thresh = clib_max (0.01 * fsh->ssvm_sh->ssvm_size,
2 * fsh->n_reserved_bytes);
if (fsh->n_free_bytes > thresh)
return;
fsh->flags |= FIFO_SEGMENT_F_MEM_LIMIT;
fsh_update_free_bytes (fsh);
}
static inline int
fss_chunk_fl_index_is_valid (fifo_segment_slice_t * fss, u32 fl_index)
{
return (fl_index < vec_len (fss->free_chunks));
}
static void
fss_chunk_free_list_push (fifo_segment_slice_t * fss, u32 fl_index,
svm_fifo_chunk_t * c)
{
clib_spinlock_lock (&fss->chunk_lock);
c->next = fss->free_chunks[fl_index];
fss->free_chunks[fl_index] = c;
clib_spinlock_unlock (&fss->chunk_lock);
}
static void
fss_chunk_free_list_push_list (fifo_segment_slice_t * fss, u32 fl_index,
svm_fifo_chunk_t * head,
svm_fifo_chunk_t * tail)
{
clib_spinlock_lock (&fss->chunk_lock);
tail->next = fss->free_chunks[fl_index];
fss->free_chunks[fl_index] = head;
clib_spinlock_unlock (&fss->chunk_lock);
}
static svm_fifo_chunk_t *
fss_chunk_free_list_pop (fifo_segment_slice_t * fss, u32 fl_index)
{
svm_fifo_chunk_t *c;
ASSERT (fss_chunk_fl_index_is_valid (fss, fl_index));
clib_spinlock_lock (&fss->chunk_lock);
if (!fss->free_chunks[fl_index])
{
clib_spinlock_unlock (&fss->chunk_lock);
return 0;
}
c = fss->free_chunks[fl_index];
fss->free_chunks[fl_index] = c->next;
clib_spinlock_unlock (&fss->chunk_lock);
return c;
}
static inline void
fss_fifo_add_active_list (fifo_segment_slice_t * fss, svm_fifo_t * f)
{
if (fss->fifos)
{
fss->fifos->prev = f;
f->next = fss->fifos;
}
fss->fifos = f;
}
static inline void
fss_fifo_del_active_list (fifo_segment_slice_t * fss, svm_fifo_t * f)
{
if (f->flags & SVM_FIFO_F_LL_TRACKED)
{
if (f->prev)
f->prev->next = f->next;
else
fss->fifos = f->next;
if (f->next)
f->next->prev = f->prev;
}
}
static inline uword
fss_fl_chunk_bytes (fifo_segment_slice_t * fss)
{
return clib_atomic_load_relax_n (&fss->n_fl_chunk_bytes);
}
static inline void
fss_fl_chunk_bytes_add (fifo_segment_slice_t * fss, uword size)
{
clib_atomic_fetch_add_relax (&fss->n_fl_chunk_bytes, size);
}
static inline void
fss_fl_chunk_bytes_sub (fifo_segment_slice_t * fss, uword size)
{
clib_atomic_fetch_sub_relax (&fss->n_fl_chunk_bytes, size);
}
/**
* Initialize fifo segment shared header
*/
int
fifo_segment_init (fifo_segment_t * fs)
{
fifo_segment_header_t *fsh;
fifo_segment_slice_t *fss;
ssvm_shared_header_t *sh;
u32 max_chunk_sz;
uword max_fifo;
void *oldheap;
int i;
sh = fs->ssvm.sh;
oldheap = ssvm_push_heap (sh);
/*
* Manually align the fifo segment header to sizeof(uword) = 8 bytes.
* Long story made short: the "process-private" fifo segment
* is allocated from the main heap, not mmapped. dlmalloc
* only guarantees 4-byte alignment, and on aarch64
* the fsh can end up 4-byte but not 8-byte aligned.
* That eventually causes the atomic op in fifo_segment_update_free_bytes
* to backfire.
*/
fsh = clib_mem_alloc_aligned (sizeof (*fsh), sizeof (uword));
clib_memset (fsh, 0, sizeof (*fsh));
fs->h = sh->opaque[0] = fsh;
fs->n_slices = clib_max (fs->n_slices, 1);
fsh->ssvm_sh = fs->ssvm.sh;
fsh->n_slices = fs->n_slices;
max_fifo = clib_min ((fsh_free_space (fsh) - 4096) / 2,
FIFO_SEGMENT_MAX_FIFO_SIZE);
fsh->max_log2_chunk_size = max_log2 (max_fifo);
fsh->slices = clib_mem_alloc (sizeof (*fss) * fs->n_slices);
clib_memset (fsh->slices, 0, sizeof (*fss) * fs->n_slices);
max_chunk_sz = fsh->max_log2_chunk_size - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE;
for (i = 0; i < fs->n_slices; i++)
{
fss = fsh_slice_get (fsh, i);
vec_validate_init_empty (fss->free_chunks, max_chunk_sz, 0);
vec_validate_init_empty (fss->num_chunks, max_chunk_sz, 0);
clib_spinlock_init (&fss->chunk_lock);
}
ssvm_pop_heap (oldheap);
fsh->n_free_bytes = fsh_free_space (fsh);
fsh->n_cached_bytes = 0;
fsh->n_reserved_bytes = clib_min (0.01 * fsh->n_free_bytes, 256 << 10);
sh->ready = 1;
return (0);
}
/**
* Create a fifo segment and initialize as master
*/
int
fifo_segment_create (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
{
fifo_segment_t *fs;
uword baseva;
int rv;
/* Allocate a fresh segment */
pool_get_zero (sm->segments, fs);
baseva = a->segment_type == SSVM_SEGMENT_PRIVATE ? ~0ULL : sm->next_baseva;
fs->ssvm.ssvm_size = a->segment_size;
fs->ssvm.is_server = 1;
fs->ssvm.my_pid = getpid ();
fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
fs->ssvm.requested_va = baseva;
if ((rv = ssvm_server_init (&fs->ssvm, a->segment_type)))
{
pool_put (sm->segments, fs);
return (rv);
}
/* Note: requested_va updated due to seg base addr randomization */
sm->next_baseva = fs->ssvm.sh->ssvm_va + fs->ssvm.ssvm_size;
fifo_segment_init (fs);
vec_add1 (a->new_segment_indices, fs - sm->segments);
return (0);
}
/**
* Attach as slave to a fifo segment
*/
int
fifo_segment_attach (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
{
fifo_segment_t *fs;
int rv;
pool_get_zero (sm->segments, fs);
fs->ssvm.ssvm_size = a->segment_size;
fs->ssvm.my_pid = getpid ();
fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
fs->ssvm.requested_va = sm->next_baseva;
if (a->segment_type == SSVM_SEGMENT_MEMFD)
fs->ssvm.fd = a->memfd_fd;
else
fs->ssvm.attach_timeout = sm->timeout_in_seconds;
if ((rv = ssvm_client_init (&fs->ssvm, a->segment_type)))
{
_vec_len (fs) = vec_len (fs) - 1;
return (rv);
}
/* Fish the segment header */
fs->h = fs->ssvm.sh->opaque[0];
vec_add1 (a->new_segment_indices, fs - sm->segments);
return (0);
}
void
fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * s)
{
ssvm_delete (&s->ssvm);
clib_memset (s, 0xfe, sizeof (*s));
pool_put (sm->segments, s);
}
u32
fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * s)
{
return s - sm->segments;
}
fifo_segment_t *
fifo_segment_get_segment (fifo_segment_main_t * sm, u32 segment_index)
{
return pool_elt_at_index (sm->segments, segment_index);
}
void
fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size)
{
*address = (char *) seg->ssvm.sh->ssvm_va;
*size = seg->ssvm.ssvm_size;
}
void
fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
u32 timeout_in_seconds)
{
sm->next_baseva = baseva;
sm->timeout_in_seconds = timeout_in_seconds;
}
static inline u32
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;
}
static inline u32
fs_freelist_index_to_size (u32 fl_index)
{
return 1 << (fl_index + FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE);
}
static inline int
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);
}
svm_fifo_chunk_t *
fs_try_alloc_multi_chunk (fifo_segment_header_t * fsh,
fifo_segment_slice_t * fss, u32 data_bytes)
{
u32 fl_index, fl_size, n_alloc = 0, req_bytes = data_bytes;
svm_fifo_chunk_t *c, *first = 0, *next;
fl_index = fs_freelist_for_size (req_bytes);
if (fl_index > 0)
fl_index -= 1;
fl_size = fs_freelist_index_to_size (fl_index);
while (req_bytes)
{
c = fss_chunk_free_list_pop (fss, fl_index);
if (c)
{
c->next = first;
first = c;
n_alloc += fl_size;
req_bytes -= clib_min (fl_size, req_bytes);
}
else
{
/* Failed to allocate with smaller chunks */
if (fl_index == 0)
{
/* Free all chunks if any allocated */
c = first;
while (c)
{
fl_index = fs_freelist_for_size (c->length);
next = c->next;
fss_chunk_free_list_push (fss, fl_index, c);
c = next;
}
n_alloc = 0;
first = 0;
/* As last attempt, try allocating a chunk larger than
* the requested size, if possible */
fl_index = fs_freelist_for_size (data_bytes) + 1;
if (!fss_chunk_fl_index_is_valid (fss, fl_index))
return 0;
first = fss_chunk_free_list_pop (fss, fl_index);
if (first)
{
first->next = 0;
n_alloc = fs_freelist_index_to_size (fl_index);
goto done;
}
return 0;
}
fl_index -= 1;
fl_size = fl_size >> 1;
}
}
done:
fss_fl_chunk_bytes_sub (fss, n_alloc);
fsh_cached_bytes_sub (fsh, n_alloc);
return first;
}
static int
fsh_try_alloc_fifo_hdr_batch (fifo_segment_header_t * fsh,
fifo_segment_slice_t * fss, u32 batch_size)
{
svm_fifo_t *f;
void *oldheap;
uword size;
u8 *fmem;
int i;
size = (uword) sizeof (*f) * batch_size;
oldheap = ssvm_push_heap (fsh->ssvm_sh);
fmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
0 /* align_offset */ ,
0 /* os_out_of_memory */ );
ssvm_pop_heap (oldheap);
/* Out of space.. */
if (fmem == 0)
return -1;
/* Carve fifo hdr space */
for (i = 0; i < batch_size; i++)
{
f = (svm_fifo_t *) fmem;
memset (f, 0, sizeof (*f));
f->next = fss->free_fifos;
fss->free_fifos = f;
fmem += sizeof (*f);
}
return 0;
}
static int
fsh_try_alloc_chunk_batch (fifo_segment_header_t * fsh,
fifo_segment_slice_t * fss,
u32 fl_index, u32 batch_size)
{
svm_fifo_chunk_t *c, *head = 0, *tail;
uword size, total_chunk_bytes;
u32 rounded_data_size;
void *oldheap;
u8 *cmem;
int i;
rounded_data_size = fs_freelist_index_to_size (fl_index);
total_chunk_bytes = (uword) batch_size *rounded_data_size;
size = (uword) (sizeof (*c) + rounded_data_size) * batch_size;
oldheap = ssvm_push_heap (fsh->ssvm_sh);
cmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
0 /* align_offset */ ,
0 /* os_out_of_memory */ );
ssvm_pop_heap (oldheap);
/* Out of space.. */
if (cmem == 0)
return -1;
/* Carve fifo + chunk space */
tail = c = (svm_fifo_chunk_t *) cmem;
for (i = 0; i < batch_size; i++)
{
c->start_byte = 0;
c->length = rounded_data_size;
c->next = head;
head = c;
cmem += sizeof (*c) + rounded_data_size;
c = (svm_fifo_chunk_t *) cmem;
}
fss_chunk_free_list_push_list (fss, fl_index, head, tail);
fss->num_chunks[fl_index] += batch_size;
fss_fl_chunk_bytes_add (fss, total_chunk_bytes);
fsh_cached_bytes_add (fsh, total_chunk_bytes);
fsh_free_bytes_sub (fsh, size);
return 0;
}
static int
fs_try_alloc_fifo_batch (fifo_segment_header_t * fsh,
fifo_segment_slice_t * fss,
u32 fl_index, u32 batch_size)
{
if (fsh_try_alloc_fifo_hdr_batch (fsh, fss, batch_size))
return 0;
return fsh_try_alloc_chunk_batch (fsh, fss, fl_index, batch_size);
}
static svm_fifo_t *
fsh_try_alloc_fifo_hdr (fifo_segment_header_t * fsh,
fifo_segment_slice_t * fss)
{
svm_fifo_t *f;
if (!fss->free_fifos)
{
if (fsh_try_alloc_fifo_hdr_batch (fsh, fss,
FIFO_SEGMENT_ALLOC_BATCH_SIZE))
return 0;
}
f = fss->free_fifos;
fss->free_fifos = f->next;
memset (f, 0, sizeof (*f));
return f;
}
static svm_fifo_chunk_t *
fsh_try_alloc_chunk (fifo_segment_header_t * fsh,
fifo_segment_slice_t * fss, u32 data_bytes)
{
svm_fifo_chunk_t *c;
u32 fl_index;
fl_index = fs_freelist_for_size (data_bytes);
free_list:
c = fss_chunk_free_list_pop (fss, fl_index);
if (c)
{
c->next = 0;
fss_fl_chunk_bytes_sub (fss, fs_freelist_index_to_size (fl_index));
fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
}
else
{
u32 chunk_size, batch = FIFO_SEGMENT_ALLOC_BATCH_SIZE;
uword n_free;
chunk_size = fs_freelist_index_to_size (fl_index);
n_free = fsh_n_free_bytes (fsh);
if (chunk_size <= n_free)
{
batch = chunk_size * batch <= n_free ? batch : 1;
if (!fsh_try_alloc_chunk_batch (fsh, fss, fl_index, batch))
goto free_list;
}
/* Failed to allocate larger chunk, try to allocate multi-chunk
* that is close to what was actually requested */
if (data_bytes <= fss_fl_chunk_bytes (fss))
{
c = fs_try_alloc_multi_chunk (fsh, fss, data_bytes);
if (c)
goto done;
batch = n_free / FIFO_SEGMENT_MIN_FIFO_SIZE;
if (!batch || fsh_try_alloc_chunk_batch (fsh, fss, 0, batch))
{
fsh_check_mem (fsh);
goto done;
}
}
if (data_bytes <= fss_fl_chunk_bytes (fss) + n_free)
{
u32 min_size = FIFO_SEGMENT_MIN_FIFO_SIZE;
batch = (data_bytes - fss_fl_chunk_bytes (fss)) / min_size;
batch = clib_min (batch + 1, n_free / min_size);
if (fsh_try_alloc_chunk_batch (fsh, fss, 0, batch))
{
fsh_check_mem (fsh);
goto done;
}
c = fs_try_alloc_multi_chunk (fsh, fss, data_bytes);
}
}
done:
return c;
}
/**
* Try to allocate new fifo
*
* Tries the following steps in order:
* - grab fifo and chunk from freelists
* - batch fifo and chunk allocation
* - single fifo allocation
* - grab multiple fifo chunks from freelists
*/
static svm_fifo_t *
fs_try_alloc_fifo (fifo_segment_header_t * fsh, fifo_segment_slice_t * fss,
u32 data_bytes)
{
u32 fl_index, min_size;
svm_fifo_chunk_t *c;
svm_fifo_t *f = 0;
min_size = clib_max ((fsh->pct_first_alloc * data_bytes) / 100, 4096);
fl_index = fs_freelist_for_size (min_size);
if (!fss_chunk_fl_index_is_valid (fss, fl_index))
return 0;
f = fsh_try_alloc_fifo_hdr (fsh, fss);
if (!f)
return 0;
c = fsh_try_alloc_chunk (fsh, fss, min_size);
if (!c)
{
f->next = fss->free_fifos;
fss->free_fifos = f;
return 0;
}
f->start_chunk = c;
while (c->next)
c = c->next;
f->end_chunk = c;
f->size = data_bytes;
f->fs_hdr = fsh;
return f;
}
svm_fifo_chunk_t *
fsh_alloc_chunk (fifo_segment_header_t * fsh, u32 slice_index, u32 chunk_size)
{
fifo_segment_slice_t *fss;
svm_fifo_chunk_t *c;
fss = fsh_slice_get (fsh, slice_index);
c = fsh_try_alloc_chunk (fsh, fss, chunk_size);
return c;
}
static void
fsh_slice_collect_chunks (fifo_segment_header_t * fsh,
fifo_segment_slice_t * fss, svm_fifo_chunk_t * c)
{
u32 n_collect = 0, fl_index;
svm_fifo_chunk_t *next;
while (c)
{
CLIB_MEM_UNPOISON (c, sizeof (*c));
next = c->next;
fl_index = fs_freelist_for_size (c->length);
fss_chunk_free_list_push (fss, fl_index, c);
n_collect += fs_freelist_index_to_size (fl_index);
c = next;
}
fss_fl_chunk_bytes_add (fss, n_collect);
fsh_cached_bytes_add (fsh, n_collect);
}
void
fsh_collect_chunks (fifo_segment_header_t * fsh, u32 slice_index,
svm_fifo_chunk_t * c)
{
fifo_segment_slice_t *fss;
fss = fsh_slice_get (fsh, slice_index);
fsh_slice_collect_chunks (fsh, fss, c);
}
/**
* Allocate fifo in fifo segment
*/
svm_fifo_t *
fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs, u32 slice_index,
u32 data_bytes, fifo_segment_ftype_t ftype)
{
fifo_segment_header_t *fsh = fs->h;
fifo_segment_slice_t *fss;
svm_fifo_t *f = 0;
ASSERT (slice_index < fs->n_slices);
if (PREDICT_FALSE (data_bytes > 1 << fsh->max_log2_chunk_size))
return 0;
fss = fsh_slice_get (fsh, slice_index);
f = fs_try_alloc_fifo (fsh, fss, data_bytes);
if (!f)
goto done;
f->slice_index = slice_index;
svm_fifo_init (f, data_bytes);
/* If rx fifo type add to active fifos list. When cleaning up segment,
* we need a list of active sessions that should be disconnected. Since
* both rx and tx fifos keep pointers to the session, it's enough to track
* only one. */
if (ftype == FIFO_SEGMENT_RX_FIFO)
{
fss_fifo_add_active_list (fss, f);
f->flags |= SVM_FIFO_F_LL_TRACKED;
}
fsh_active_fifos_update (fsh, 1);
fss->virtual_mem += svm_fifo_size (f);
done:
return (f);
}
/**
* Free fifo allocated in fifo segment
*/
void
fifo_segment_free_fifo (fifo_segment_t * fs, svm_fifo_t * f)
{
fifo_segment_header_t *fsh = fs->h;
fifo_segment_slice_t *fss;
ASSERT (f->refcnt > 0);
if (--f->refcnt > 0)
return;
fss = fsh_slice_get (fsh, f->slice_index);
/* Remove from active list. Only rx fifos are tracked */
if (f->flags & SVM_FIFO_F_LL_TRACKED)
{
fss_fifo_del_active_list (fss, f);
f->flags &= ~SVM_FIFO_F_LL_TRACKED;
}
/* Free fifo chunks */
fsh_slice_collect_chunks (fsh, fss, f->start_chunk);
f->start_chunk = f->end_chunk = 0;
f->head_chunk = f->tail_chunk = f->ooo_enq = f->ooo_deq = 0;
/* not allocated on segment heap */
svm_fifo_free_chunk_lookup (f);
svm_fifo_free_ooo_data (f);
if (CLIB_DEBUG)
{
f->master_session_index = ~0;
f->master_thread_index = ~0;
}
fss->virtual_mem -= svm_fifo_size (f);
/* Add to free list */
f->next = fss->free_fifos;
f->prev = 0;
fss->free_fifos = f;
fsh_active_fifos_update (fsh, -1);
}
void
fifo_segment_detach_fifo (fifo_segment_t * fs, svm_fifo_t * f)
{
fifo_segment_slice_t *fss;
svm_fifo_chunk_t *c;
u32 fl_index;
ASSERT (f->refcnt == 1);
fss = fsh_slice_get (fs->h, f->slice_index);
fss->virtual_mem -= svm_fifo_size (f);
if (f->flags & SVM_FIFO_F_LL_TRACKED)
fss_fifo_del_active_list (fss, f);
c = f->start_chunk;
while (c)
{
fl_index = fs_freelist_for_size (c->length);
clib_atomic_fetch_sub_rel (&fss->num_chunks[fl_index], 1);
c = c->next;
}
}
void
fifo_segment_attach_fifo (fifo_segment_t * fs, svm_fifo_t * f,
u32 slice_index)
{
fifo_segment_slice_t *fss;
svm_fifo_chunk_t *c;
u32 fl_index;
f->slice_index = slice_index;
fss = fsh_slice_get (fs->h, f->slice_index);
fss->virtual_mem += svm_fifo_size (f);
if (f->flags & SVM_FIFO_F_LL_TRACKED)
fss_fifo_add_active_list (fss, f);
c = f->start_chunk;
while (c)
{
fl_index = fs_freelist_for_size (c->length);
clib_atomic_fetch_add_rel (&fss->num_chunks[fl_index], 1);
c = c->next;
}
}
int
fifo_segment_prealloc_fifo_hdrs (fifo_segment_t * fs, u32 slice_index,
u32 batch_size)
{
fifo_segment_header_t *fsh = fs->h;
fifo_segment_slice_t *fss;
svm_fifo_t *f;
void *oldheap;
uword size;
u8 *fmem;
int i;
fss = fsh_slice_get (fsh, slice_index);
size = (uword) (sizeof (*f)) * batch_size;
oldheap = ssvm_push_heap (fsh->ssvm_sh);
fmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
0 /* align_offset */ ,
0 /* os_out_of_memory */ );
ssvm_pop_heap (oldheap);
/* Out of space.. */
if (fmem == 0)
return -1;
/* Carve fifo + chunk space */
for (i = 0; i < batch_size; i++)
{
f = (svm_fifo_t *) fmem;
memset (f, 0, sizeof (*f));
f->next = fss->free_fifos;
fss->free_fifos = f;
fmem += sizeof (*f);
}
fsh_free_bytes_sub (fsh, size);
return 0;
}
int
fifo_segment_prealloc_fifo_chunks (fifo_segment_t * fs, u32 slice_index,
u32 chunk_size, u32 batch_size)
{
fifo_segment_header_t *fsh = fs->h;
fifo_segment_slice_t *fss;
u32 fl_index;
if (!fs_chunk_size_is_valid (fsh, chunk_size))
{
clib_warning ("chunk size out of range %d", chunk_size);
return -1;
}
fl_index = fs_freelist_for_size (chunk_size);
fss = fsh_slice_get (fsh, slice_index);
return fsh_try_alloc_chunk_batch (fsh, fss, fl_index, batch_size);
}
/**
* Pre-allocates fifo pairs in fifo segment
*/
void
fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
u32 rx_fifo_size, u32 tx_fifo_size,
u32 * n_fifo_pairs)
{
u32 rx_rounded_data_size, tx_rounded_data_size, pair_size, pairs_to_alloc;
u32 hdrs, pairs_per_slice, alloc_now;
fifo_segment_header_t *fsh = fs->h;
int rx_fl_index, tx_fl_index, i;
fifo_segment_slice_t *fss;
uword space_available;
/* Parameter check */
if (rx_fifo_size == 0 || tx_fifo_size == 0 || *n_fifo_pairs == 0)
return;
if (!fs_chunk_size_is_valid (fsh, rx_fifo_size))
{
clib_warning ("rx fifo_size out of range %d", rx_fifo_size);
return;
}
if (!fs_chunk_size_is_valid (fsh, tx_fifo_size))
{
clib_warning ("tx fifo_size out of range %d", tx_fifo_size);
return;
}
rx_rounded_data_size = (1 << (max_log2 (rx_fifo_size)));
rx_fl_index = fs_freelist_for_size (rx_fifo_size);
tx_rounded_data_size = (1 << (max_log2 (tx_fifo_size)));
tx_fl_index = fs_freelist_for_size (tx_fifo_size);
hdrs = sizeof (svm_fifo_t) + sizeof (svm_fifo_chunk_t);
/* Calculate space requirements */
pair_size = 2 * hdrs + rx_rounded_data_size + tx_rounded_data_size;
space_available = fsh_free_space (fsh);
pairs_to_alloc = space_available / pair_size;
pairs_to_alloc = clib_min (pairs_to_alloc, *n_fifo_pairs);
pairs_per_slice = pairs_to_alloc / fs->n_slices;
pairs_per_slice += pairs_to_alloc % fs->n_slices ? 1 : 0;
if (!pairs_per_slice)
return;
for (i = 0; i < fs->n_slices; i++)
{
fss = fsh_slice_get (fsh, i);
alloc_now = clib_min (pairs_per_slice, *n_fifo_pairs);
if (fs_try_alloc_fifo_batch (fsh, fss, rx_fl_index, alloc_now))
clib_warning ("rx prealloc failed: pairs %u", alloc_now);
if (fs_try_alloc_fifo_batch (fsh, fss, tx_fl_index, alloc_now))
clib_warning ("tx prealloc failed: pairs %u", alloc_now);
/* Account for the pairs allocated */
*n_fifo_pairs -= alloc_now;
}
}
/**
* Get number of active fifos
*/
u32
fifo_segment_num_fifos (fifo_segment_t * fs)
{
return fsh_n_active_fifos (fs->h);
}
static u32
fs_slice_num_free_fifos (fifo_segment_slice_t * fss)
{
svm_fifo_t *f;
u32 count = 0;
f = fss->free_fifos;
if (f == 0)
return 0;
while (f)
{
f = f->next;
count++;
}
return count;
}
u32
fifo_segment_num_free_fifos (fifo_segment_t * fs)
{
fifo_segment_header_t *fsh = fs->h;
fifo_segment_slice_t *fss;
int slice_index;
u32 count = 0;
for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
{
fss = fsh_slice_get (fsh, slice_index);
count += fs_slice_num_free_fifos (fss);
}
return count;
}
static u32
fs_slice_num_free_chunks (fifo_segment_slice_t * fss, u32 size)
{
u32 count = 0, rounded_size, fl_index;
svm_fifo_chunk_t *c;
int i;
/* Count all free chunks? */
if (size == ~0)
{
for (i = 0; i < vec_len (fss->free_chunks); i++)
{
c = fss->free_chunks[i];
if (c == 0)
continue;
while (c)
{
c = c->next;
count++;
}
}
return count;
}
rounded_size = (1 << (max_log2 (size)));
fl_index = fs_freelist_for_size (rounded_size);
if (fl_index >= vec_len (fss->free_chunks))
return 0;
c = fss->free_chunks[fl_index];
if (c == 0)
return 0;
while (c)
{
c = c->next;
count++;
}
return count;
}
u32
fifo_segment_num_free_chunks (fifo_segment_t * fs, u32 size)
{
fifo_segment_header_t *fsh = fs->h;
fifo_segment_slice_t *fss;
int slice_index;
u32 count = 0;
for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
{
fss = fsh_slice_get (fsh, slice_index);
count += fs_slice_num_free_chunks (fss, size);
}
return count;
}
void
fifo_segment_update_free_bytes (fifo_segment_t * fs)
{
fsh_update_free_bytes (fs->h);
}
uword
fifo_segment_size (fifo_segment_t * fs)
{
return fs->ssvm.ssvm_size;
}
u8
fsh_has_reached_mem_limit (fifo_segment_header_t * fsh)
{
return (fsh->flags & FIFO_SEGMENT_F_MEM_LIMIT) ? 1 : 0;
}
void
fsh_reset_mem_limit (fifo_segment_header_t * fsh)
{
fsh->flags &= ~FIFO_SEGMENT_F_MEM_LIMIT;
}
uword
fifo_segment_free_bytes (fifo_segment_t * fs)
{
return fsh_n_free_bytes (fs->h);
}
uword
fifo_segment_cached_bytes (fifo_segment_t * fs)
{
return fsh_n_cached_bytes (fs->h);
}
uword
fifo_segment_available_bytes (fifo_segment_t * fs)
{
return fsh_n_free_bytes (fs->h) + fsh_n_cached_bytes (fs->h);
}
uword
fifo_segment_fl_chunk_bytes (fifo_segment_t * fs)
{
fifo_segment_header_t *fsh = fs->h;
fifo_segment_slice_t *fss;
uword n_bytes = 0;
int slice_index;
for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
{
fss = fsh_slice_get (fsh, slice_index);
n_bytes += fss_fl_chunk_bytes (fss);
}
return n_bytes;
}
u8
fifo_segment_has_fifos (fifo_segment_t * fs)
{
return (fsh_n_active_fifos (fs->h) != 0);
}
svm_fifo_t *
fifo_segment_get_slice_fifo_list (fifo_segment_t * fs, u32 slice_index)
{
fifo_segment_header_t *fsh = fs->h;
fifo_segment_slice_t *fss;
fss = fsh_slice_get (fsh, slice_index);
return fss->fifos;
}
u8
fifo_segment_get_mem_usage (fifo_segment_t * fs)
{
uword size, in_use;
size = fifo_segment_size (fs);
in_use =
size - fifo_segment_free_bytes (fs) - fifo_segment_cached_bytes (fs);
return (in_use * 100) / size;
}
fifo_segment_mem_status_t
fifo_segment_determine_status (fifo_segment_header_t * fsh, u8 usage)
{
if (!fsh->high_watermark || !fsh->low_watermark)
return MEMORY_PRESSURE_NO_PRESSURE;
/* once the no-memory is detected, the status continues
* until memory usage gets below the high watermark
*/
if (fsh_has_reached_mem_limit (fsh))
{
if (usage >= fsh->high_watermark)
return MEMORY_PRESSURE_NO_MEMORY;
else
fsh_reset_mem_limit (fsh);
}
if (usage >= fsh->high_watermark)
return MEMORY_PRESSURE_HIGH_PRESSURE;
else if (usage >= fsh->low_watermark)
return MEMORY_PRESSURE_LOW_PRESSURE;
return MEMORY_PRESSURE_NO_PRESSURE;
}
fifo_segment_mem_status_t
fifo_segment_get_mem_status (fifo_segment_t * fs)
{
fifo_segment_header_t *fsh = fs->h;
u8 usage = fifo_segment_get_mem_usage (fs);
return fifo_segment_determine_status (fsh, usage);
}
u8 *
format_fifo_segment_type (u8 * s, va_list * args)
{
fifo_segment_t *sp;
sp = va_arg (*args, fifo_segment_t *);
ssvm_segment_type_t st = ssvm_type (&sp->ssvm);
if (st == SSVM_SEGMENT_PRIVATE)
s = format (s, "%s", "private");
else if (st == SSVM_SEGMENT_MEMFD)
s = format (s, "%s", "memfd");
else if (st == SSVM_SEGMENT_SHM)
s = format (s, "%s", "shm");
else
s = format (s, "%s", "unknown");
return s;
}
/**
* Segment format function
*/
u8 *
format_fifo_segment (u8 * s, va_list * args)
{
u32 count, indent, active_fifos, free_fifos;
fifo_segment_t *fs = va_arg (*args, fifo_segment_t *);
int verbose __attribute__ ((unused)) = va_arg (*args, int);
uword est_chunk_bytes, est_free_seg_bytes, free_chunks;
uword chunk_bytes = 0, free_seg_bytes, chunk_size;
uword tracked_cached_bytes;
uword fifo_hdr = 0, reserved;
fifo_segment_header_t *fsh;
fifo_segment_slice_t *fss;
svm_fifo_chunk_t *c;
u32 slice_index;
char *address;
size_t size;
int i;
uword allocated, in_use, virt;
f64 usage;
fifo_segment_mem_status_t mem_st;
indent = format_get_indent (s) + 2;
if (fs == 0)
{
s = format (s, "%-20s%10s%15s%15s%15s%15s", "Name", "Type",
"HeapSize (M)", "ActiveFifos", "FreeFifos", "Address");
return s;
}
fifo_segment_info (fs, &address, &size);
active_fifos = fifo_segment_num_fifos (fs);
free_fifos = fifo_segment_num_free_fifos (fs);
s = format (s, "%-20v%10U%15llu%15u%15u%15llx", ssvm_name (&fs->ssvm),
format_fifo_segment_type, fs, size >> 20ULL, active_fifos,
free_fifos, address);
if (!verbose)
return s;
fsh = fs->h;
free_chunks = fifo_segment_num_free_chunks (fs, ~0);
if (free_chunks)
s =
format (s, "\n\n%UFree/Allocated chunks by size:\n", format_white_space,
indent + 2);
else
s = format (s, "\n");
for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
{
fss = fsh_slice_get (fsh, slice_index);
for (i = 0; i < vec_len (fss->free_chunks); i++)
{
c = fss->free_chunks[i];
if (c == 0 && fss->num_chunks[i] == 0)
continue;
count = 0;
while (c)
{
c = c->next;
count++;
}
chunk_size = fs_freelist_index_to_size (i);
s = format (s, "%U%-5u kB: %u/%u\n", format_white_space, indent + 2,
chunk_size >> 10, count, fss->num_chunks[i]);
chunk_bytes += count * chunk_size;
}
}
fifo_hdr = free_fifos * sizeof (svm_fifo_t);
est_chunk_bytes = fifo_segment_fl_chunk_bytes (fs);
est_free_seg_bytes = fifo_segment_free_bytes (fs);
fifo_segment_update_free_bytes (fs);
free_seg_bytes = fifo_segment_free_bytes (fs);
tracked_cached_bytes = fifo_segment_cached_bytes (fs);
allocated = fifo_segment_size (fs);
in_use = fifo_segment_size (fs) - est_free_seg_bytes - tracked_cached_bytes;
usage = (100.0 * in_use) / allocated;
mem_st = fifo_segment_get_mem_status (fs);
virt = fsh_virtual_mem (fsh);
reserved = fsh->n_reserved_bytes;
s = format (s, "\n%Useg free bytes: %U (%lu) estimated: %U (%lu) reserved:"
" %U (%lu)\n", format_white_space, indent + 2,
format_memory_size, free_seg_bytes, free_seg_bytes,
format_memory_size, est_free_seg_bytes, est_free_seg_bytes,
format_memory_size, reserved, reserved);
s = format (s, "%Uchunk free bytes: %U (%lu) estimated: %U (%lu) tracked:"
" %U (%lu)\n", format_white_space, indent + 2,
format_memory_size, chunk_bytes, chunk_bytes,
format_memory_size, est_chunk_bytes, est_chunk_bytes,
format_memory_size, tracked_cached_bytes, tracked_cached_bytes);
s = format (s, "%Ufifo active: %u hdr free bytes: %U (%u) \n",
format_white_space, indent + 2, fsh->n_active_fifos,
format_memory_size, fifo_hdr, fifo_hdr);
s = format (s, "%Usegment usage: %.2f%% (%U / %U) virt: %U status: %s\n",
format_white_space, indent + 2, usage, format_memory_size,
in_use, format_memory_size, allocated, format_memory_size, virt,
fifo_segment_mem_status_strings[mem_st]);
s = format (s, "\n");
return s;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/