fifo_segment.h File Reference

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Data Structures
struct	fifo_segment_t
struct	fifo_segment_main_t
struct	fifo_segment_create_args_t

Macros
#define	FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE   12
	4kB min fifo size More...
#define	FIFO_SEGMENT_MIN_FIFO_SIZE   4096
	4kB min fifo size More...
#define	FIFO_SEGMENT_MAX_FIFO_SIZE   (2 << 30)
	2GB max fifo size More...
#define	FIFO_SEGMENT_ALLOC_BATCH_SIZE   32 /* Allocation quantum */
#define	foreach_segment_mem_status
#define	fifo_segment_flags(_fs)   _fs->h->flags

Typedefs
typedef enum fifo_segment_flags_	fifo_segment_flags_t

Enumerations
enum	fifo_segment_ftype_t { FIFO_SEGMENT_FTYPE_NONE = -1, FIFO_SEGMENT_RX_FIFO = 0, FIFO_SEGMENT_TX_FIFO, FIFO_SEGMENT_N_FTYPES }
enum	fifo_segment_flags_ { FIFO_SEGMENT_F_IS_PREALLOCATED = 1 << 0, FIFO_SEGMENT_F_WILL_DELETE = 1 << 1, FIFO_SEGMENT_F_MEM_LIMIT = 1 << 2 }
enum	fifo_segment_mem_status_t { MEMORY_N_PRESSURE }

Functions
int	fifo_segment_init (fifo_segment_t *fs)
	Initialize fifo segment shared header. More...
int	fifo_segment_create (fifo_segment_main_t *sm, fifo_segment_create_args_t *a)
	Create a fifo segment and initialize as master. More...
int	fifo_segment_attach (fifo_segment_main_t *sm, fifo_segment_create_args_t *a)
	Attach as slave to a fifo segment. More...
void	fifo_segment_delete (fifo_segment_main_t *sm, fifo_segment_t *fs)
fifo_segment_t *	fifo_segment_get_segment (fifo_segment_main_t *sm, u32 fs_index)
u32	fifo_segment_index (fifo_segment_main_t *sm, fifo_segment_t *fs)
void	fifo_segment_info (fifo_segment_t *seg, char **address, size_t *size)
svm_fifo_t *	fifo_segment_alloc_fifo_w_slice (fifo_segment_t *fs, u32 slice_index, u32 data_bytes, fifo_segment_ftype_t ftype)
	Allocate fifo in fifo segment. More...
void	fifo_segment_free_fifo (fifo_segment_t *fs, svm_fifo_t *f)
	Free fifo allocated in fifo segment. More...
void	fifo_segment_detach_fifo (fifo_segment_t *fs, svm_fifo_t *f)
void	fifo_segment_attach_fifo (fifo_segment_t *fs, svm_fifo_t *f, u32 slice_index)
int	fifo_segment_prealloc_fifo_hdrs (fifo_segment_t *fs, u32 slice_index, u32 batch_size)
	Try to preallocate fifo headers. More...
int	fifo_segment_prealloc_fifo_chunks (fifo_segment_t *fs, u32 slice_index, u32 chunk_size, u32 batch_size)
	Try to preallocate fifo chunks on segment. More...
void	fifo_segment_preallocate_fifo_pairs (fifo_segment_t *fs, u32 rx_fifo_size, u32 tx_fifo_size, u32 *n_fifo_pairs)
	Pre-allocates fifo pairs in fifo segment. More...
svm_fifo_chunk_t *	fsh_alloc_chunk (fifo_segment_header_t *fsh, u32 slice_index, u32 chunk_size)
	Allocate chunks in fifo segment. More...
void	fsh_collect_chunks (fifo_segment_header_t *fsh, u32 slice_index, svm_fifo_chunk_t *c)
	Return chunks to fifo segment. More...
u8	fsh_has_reached_mem_limit (fifo_segment_header_t *fsh)
	Fifo segment has reached mem limit. More...
void	fsh_reset_mem_limit (fifo_segment_header_t *fsh)
	Fifo segment reset mem limit flag. More...
uword	fifo_segment_size (fifo_segment_t *fs)
	Fifo segment allocated size. More...
uword	fifo_segment_free_bytes (fifo_segment_t *fs)
	Fifo segment estimate of number of free bytes. More...
void	fifo_segment_update_free_bytes (fifo_segment_t *fs)
	Update fifo segment free bytes estimate. More...
uword	fifo_segment_cached_bytes (fifo_segment_t *fs)
	Fifo segment number of cached bytes. More...
uword	fifo_segment_available_bytes (fifo_segment_t *fs)
uword	fifo_segment_fl_chunk_bytes (fifo_segment_t *fs)
	Number of bytes on chunk free lists. More...
u8	fifo_segment_has_fifos (fifo_segment_t *fs)
svm_fifo_t *	fifo_segment_get_slice_fifo_list (fifo_segment_t *fs, u32 slice_index)
u32	fifo_segment_num_fifos (fifo_segment_t *fs)
	Get number of active fifos. More...
u32	fifo_segment_num_free_fifos (fifo_segment_t *fs)
u32	fifo_segment_num_free_chunks (fifo_segment_t *fs, u32 size)
	Find number of free chunks of given size. More...
u8	fifo_segment_get_mem_usage (fifo_segment_t *fs)
fifo_segment_mem_status_t	fifo_segment_determine_status (fifo_segment_header_t *fsh, u8 usage)
fifo_segment_mem_status_t	fifo_segment_get_mem_status (fifo_segment_t *fs)
void	fifo_segment_main_init (fifo_segment_main_t *sm, u64 baseva, u32 timeout_in_seconds)

Variables
format_function_t	format_fifo_segment
format_function_t	format_fifo_segment_type

Macro Definition Documentation

FIFO_SEGMENT_ALLOC_BATCH_SIZE

#define FIFO_SEGMENT_ALLOC_BATCH_SIZE   32 /* Allocation quantum */

Definition at line 33 of file fifo_segment.h.

fifo_segment_flags

#define fifo_segment_flags

(

_fs

)

_fs->h->flags

Definition at line 89 of file fifo_segment.h.

FIFO_SEGMENT_MAX_FIFO_SIZE

#define FIFO_SEGMENT_MAX_FIFO_SIZE   (2 << 30)

2GB max fifo size

Definition at line 32 of file fifo_segment.h.

FIFO_SEGMENT_MIN_FIFO_SIZE

#define FIFO_SEGMENT_MIN_FIFO_SIZE   4096

4kB min fifo size

Definition at line 31 of file fifo_segment.h.

FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE

#define FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE   12

4kB min fifo size

Definition at line 30 of file fifo_segment.h.

foreach_segment_mem_status

#define foreach_segment_mem_status

Value:

_(NO_PRESSURE, "No pressure")           \
_(LOW_PRESSURE, "Low pressure")         \
_(HIGH_PRESSURE, "High pressure")       \
_(NO_MEMORY, "No memory")

Definition at line 42 of file fifo_segment.h.

Typedef Documentation

fifo_segment_flags_t

typedef enum fifo_segment_flags_ fifo_segment_flags_t

Enumeration Type Documentation

fifo_segment_flags_

enum fifo_segment_flags_

Enumerator
FIFO_SEGMENT_F_IS_PREALLOCATED
FIFO_SEGMENT_F_WILL_DELETE
FIFO_SEGMENT_F_MEM_LIMIT

Definition at line 35 of file fifo_segment.h.

fifo_segment_ftype_t

enum fifo_segment_ftype_t

Enumerator
FIFO_SEGMENT_FTYPE_NONE
FIFO_SEGMENT_RX_FIFO
FIFO_SEGMENT_TX_FIFO
FIFO_SEGMENT_N_FTYPES

Definition at line 22 of file fifo_segment.h.

fifo_segment_mem_status_t

enum fifo_segment_mem_status_t

Enumerator
MEMORY_N_PRESSURE

Definition at line 48 of file fifo_segment.h.

Function Documentation

fifo_segment_alloc_fifo_w_slice()

svm_fifo_t* fifo_segment_alloc_fifo_w_slice	(	fifo_segment_t *	fs,
		u32	slice_index,
		u32	data_bytes,
		fifo_segment_ftype_t	ftype
	)

Allocate fifo in fifo segment.

Parameters

fs	fifo segment for fifo
data_bytes	size of default fifo chunk in bytes
ftype	fifo type fifo_segment_ftype_t

Returns

new fifo or 0 if alloc failed

Definition at line 842 of file fifo_segment.c.

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fifo_segment_attach()

int fifo_segment_attach	(	fifo_segment_main_t *	sm,
		fifo_segment_create_args_t *	a
	)

Attach as slave to a fifo segment.

Definition at line 235 of file fifo_segment.c.

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fifo_segment_attach_fifo()

void fifo_segment_attach_fifo	(	fifo_segment_t *	fs,
		svm_fifo_t *	f,
		u32	slice_index
	)

Definition at line 959 of file fifo_segment.c.

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fifo_segment_available_bytes()

uword fifo_segment_available_bytes

(

fifo_segment_t *

fs

)

Definition at line 1277 of file fifo_segment.c.

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fifo_segment_cached_bytes()

uword fifo_segment_cached_bytes

(

fifo_segment_t *

fs

)

Fifo segment number of cached bytes.

Returns fifo segment's number of cached bytes.

Parameters

fs	fifo segment

Returns

cached bytes

Definition at line 1271 of file fifo_segment.c.

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fifo_segment_create()

int fifo_segment_create	(	fifo_segment_main_t *	sm,
		fifo_segment_create_args_t *	a
	)

Create a fifo segment and initialize as master.

Definition at line 201 of file fifo_segment.c.

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fifo_segment_delete()

void fifo_segment_delete	(	fifo_segment_main_t *	sm,
		fifo_segment_t *	fs
	)

Definition at line 265 of file fifo_segment.c.

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fifo_segment_detach_fifo()

void fifo_segment_detach_fifo	(	fifo_segment_t *	fs,
		svm_fifo_t *	f
	)

Definition at line 936 of file fifo_segment.c.

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fifo_segment_determine_status()

fifo_segment_mem_status_t fifo_segment_determine_status	(	fifo_segment_header_t *	fsh,
		u8	usage
	)

Definition at line 1327 of file fifo_segment.c.

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fifo_segment_fl_chunk_bytes()

uword fifo_segment_fl_chunk_bytes

(

fifo_segment_t *

fs

)

Number of bytes on chunk free lists.

Parameters

fs	fifo segment

Returns

free bytes on chunk free lists

Definition at line 1283 of file fifo_segment.c.

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fifo_segment_free_bytes()

uword fifo_segment_free_bytes

(

fifo_segment_t *

fs

)

Fifo segment estimate of number of free bytes.

Returns fifo segment's internal estimate of the number of free bytes. To force a synchronization between the segment and the underlying memory allocator, call fifo_segment_update_free_bytes

Parameters

fs	fifo segment

Returns

free bytes estimate

Definition at line 1265 of file fifo_segment.c.

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fifo_segment_free_fifo()

void fifo_segment_free_fifo	(	fifo_segment_t *	fs,
		svm_fifo_t *	f
	)

Free fifo allocated in fifo segment.

Parameters

fs	fifo segment for fifo
f	fifo to be freed

Definition at line 890 of file fifo_segment.c.

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fifo_segment_get_mem_status()

fifo_segment_mem_status_t fifo_segment_get_mem_status

(

fifo_segment_t *

fs

)

Definition at line 1353 of file fifo_segment.c.

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fifo_segment_get_mem_usage()

u8 fifo_segment_get_mem_usage

(

fifo_segment_t *

fs

)

Definition at line 1316 of file fifo_segment.c.

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fifo_segment_get_segment()

fifo_segment_t* fifo_segment_get_segment	(	fifo_segment_main_t *	sm,
		u32	fs_index
	)

Definition at line 279 of file fifo_segment.c.

fifo_segment_get_slice_fifo_list()

svm_fifo_t* fifo_segment_get_slice_fifo_list	(	fifo_segment_t *	fs,
		u32	slice_index
	)

Definition at line 1306 of file fifo_segment.c.

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fifo_segment_has_fifos()

u8 fifo_segment_has_fifos

(

fifo_segment_t *

fs

)

Definition at line 1300 of file fifo_segment.c.

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fifo_segment_index()

u32 fifo_segment_index	(	fifo_segment_main_t *	sm,
		fifo_segment_t *	fs
	)

Definition at line 273 of file fifo_segment.c.

fifo_segment_info()

void fifo_segment_info	(	fifo_segment_t *	seg,
		char **	address,
		size_t *	size
	)

Definition at line 285 of file fifo_segment.c.

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fifo_segment_init()

int fifo_segment_init

(

fifo_segment_t *

fs

)

Initialize fifo segment shared header.

Definition at line 143 of file fifo_segment.c.

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fifo_segment_main_init()

void fifo_segment_main_init	(	fifo_segment_main_t *	sm,
		u64	baseva,
		u32	timeout_in_seconds
	)

Definition at line 292 of file fifo_segment.c.

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fifo_segment_num_fifos()

u32 fifo_segment_num_fifos

(

fifo_segment_t *

fs

)

Get number of active fifos.

Definition at line 1142 of file fifo_segment.c.

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fifo_segment_num_free_chunks()

u32 fifo_segment_num_free_chunks	(	fifo_segment_t *	fs,
		u32	size
	)

Find number of free chunks of given size.

Parameters

fs	fifo segment
size	chunk size of interest or ~0 if all should be counted

Returns

number of chunks of given size

Definition at line 1225 of file fifo_segment.c.

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fifo_segment_num_free_fifos()

u32 fifo_segment_num_free_fifos

(

fifo_segment_t *

fs

)

Definition at line 1166 of file fifo_segment.c.

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fifo_segment_prealloc_fifo_chunks()

int fifo_segment_prealloc_fifo_chunks	(	fifo_segment_t *	fs,
		u32	slice_index,
		u32	chunk_size,
		u32	batch_size
	)

Try to preallocate fifo chunks on segment.

Tries to preallocate chunks of requested size on segment and adds them to chunk freelist.

Parameters

fs	fifo segment
chunk_size	size of chunks to be allocated in bytes
batch_size	number of chunks to be allocated

Returns

0 on success, negative number otherwise

Definition at line 1022 of file fifo_segment.c.

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fifo_segment_prealloc_fifo_hdrs()

int fifo_segment_prealloc_fifo_hdrs	(	fifo_segment_t *	fs,
		u32	slice_index,
		u32	batch_size
	)

Try to preallocate fifo headers.

Tries to preallocate fifo headers and adds them to freelist.

Parameters

fs	fifo segment
batch_size	number of chunks to be allocated

Returns

0 on success, negative number otherwise

Definition at line 982 of file fifo_segment.c.

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fifo_segment_preallocate_fifo_pairs()

void fifo_segment_preallocate_fifo_pairs	(	fifo_segment_t *	fs,
		u32	rx_fifo_size,
		u32	tx_fifo_size,
		u32 *	n_fifo_pairs
	)

Pre-allocates fifo pairs in fifo segment.

The number of fifos pre-allocated is the minimum of the requested number of pairs and the maximum number that fit within the segment. If the maximum is hit, the number of fifo pairs requested is updated by subtracting the number of fifos that have been successfully allocated.

Parameters

fs	fifo segment for fifo
rx_fifo_size	data size of rx fifos
tx_fifo_size	data size of tx fifos
n_fifo_pairs	number of pairs requested. Prior to returning, this is decremented by the the number of pairs allocated.

Definition at line 1079 of file fifo_segment.c.

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fifo_segment_size()

uword fifo_segment_size

(

fifo_segment_t *

fs

)

Fifo segment allocated size.

Returns fifo segment's allocated size

Parameters

fs	fifo segment

Returns

allocated size in bytes

Definition at line 1247 of file fifo_segment.c.

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fifo_segment_update_free_bytes()

void fifo_segment_update_free_bytes

(

fifo_segment_t *

fs

)

Update fifo segment free bytes estimate.

Forces fifo segment free bytes estimate synchronization with underlying memory allocator.

Parameters

fs	fifo segment

Definition at line 1241 of file fifo_segment.c.

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fsh_alloc_chunk()

svm_fifo_chunk_t* fsh_alloc_chunk	(	fifo_segment_header_t *	fsh,
		u32	slice_index,
		u32	chunk_size
	)

Allocate chunks in fifo segment.

Parameters

fsh	fifo segment header
slice_index	slice where chunks should be alocated
chunk_size	chunk size needed

Returns

chunk (or chunks) that cover at least chunk_size bytes on success, 0 on failure.

Definition at line 695 of file fifo_segment.c.

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fsh_collect_chunks()

void fsh_collect_chunks	(	fifo_segment_header_t *	fsh,
		u32	slice_index,
		svm_fifo_chunk_t *	c
	)

Return chunks to fifo segment.

Parameters

fsh	fifo segment header
slice_index	slice where chunks should be returned
c	pointer to first chunk in 0 terminated linked list

Definition at line 805 of file fifo_segment.c.

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fsh_has_reached_mem_limit()

u8 fsh_has_reached_mem_limit

(

fifo_segment_header_t *

fsh

)

Fifo segment has reached mem limit.

Parameters

fsh	fifo segment header

Returns

1 (if reached) or 0 (otherwise)

Definition at line 1253 of file fifo_segment.c.

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fsh_reset_mem_limit()

void fsh_reset_mem_limit

(

fifo_segment_header_t *

fsh

)

Fifo segment reset mem limit flag.

Parameters

fs	fifo segment

Definition at line 1259 of file fifo_segment.c.

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Variable Documentation

format_fifo_segment

format_function_t format_fifo_segment

Definition at line 281 of file fifo_segment.h.

format_fifo_segment_type

format_function_t format_fifo_segment_type

Definition at line 282 of file fifo_segment.h.