svm_fifo.c File Reference

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Functions
	CLIB_MARCH_FN (svm_fifo_copy_to_chunk, void, svm_fifo_t *f, svm_fifo_chunk_t *c, u32 tail_idx, const u8 *src, u32 len, svm_fifo_chunk_t **last)
	CLIB_MARCH_FN (svm_fifo_copy_from_chunk, void, svm_fifo_t *f, svm_fifo_chunk_t *c, u32 head_idx, u8 *dst, u32 len, svm_fifo_chunk_t **last)
static void	svm_fifo_copy_to_chunk (svm_fifo_t *f, svm_fifo_chunk_t *c, u32 tail_idx, const u8 *src, u32 len, svm_fifo_chunk_t **last)
static void	svm_fifo_copy_from_chunk (svm_fifo_t *f, svm_fifo_chunk_t *c, u32 head_idx, u8 *dst, u32 len, svm_fifo_chunk_t **last)
static u32	ooo_segment_end_pos (ooo_segment_t *s)
void	svm_fifo_free_ooo_data (svm_fifo_t *f)
	Cleanup fifo ooo data. More...
static ooo_segment_t *	ooo_segment_prev (svm_fifo_t *f, ooo_segment_t *s)
static ooo_segment_t *	ooo_segment_next (svm_fifo_t *f, ooo_segment_t *s)
static ooo_segment_t *	ooo_segment_alloc (svm_fifo_t *f, u32 start, u32 length)
static void	ooo_segment_free (svm_fifo_t *f, u32 index)
static void	ooo_segment_add (svm_fifo_t *f, u32 offset, u32 head, u32 tail, u32 length)
	Add segment to fifo's out-of-order segment list. More...
static int	ooo_segment_try_collect (svm_fifo_t *f, u32 n_bytes_enqueued, u32 *tail)
	Removes segments that can now be enqueued because the fifo's tail has advanced. More...
static __clib_unused ooo_segment_t *	ooo_segment_last (svm_fifo_t *f)
void	svm_fifo_init (svm_fifo_t *f, u32 size)
	Initialize fifo. More...
void	svm_fifo_init_ooo_lookup (svm_fifo_t *f, u8 ooo_type)
	Initialize rbtrees used for ooo lookups. More...
svm_fifo_t *	svm_fifo_alloc (u32 data_size_in_bytes)
	Creates a fifo in the current heap. More...
svm_fifo_chunk_t *	svm_fifo_chunk_alloc (u32 size)
	Creates a fifo chunk in the current heap. More...
static svm_fifo_chunk_t *	svm_fifo_find_chunk (svm_fifo_t *f, u32 pos)
	Find chunk for given byte position. More...
static svm_fifo_chunk_t *	svm_fifo_find_next_chunk (svm_fifo_t *f, svm_fifo_chunk_t *start, u32 pos)
u32	svm_fifo_max_read_chunk (svm_fifo_t *f)
	Max contiguous chunk of data that can be read. More...
u32	svm_fifo_max_write_chunk (svm_fifo_t *f)
	Max contiguous chunk of data that can be written. More...
static rb_node_t *	f_find_node_rbtree (rb_tree_t *rt, u32 pos)
static svm_fifo_chunk_t *	f_find_chunk_rbtree (rb_tree_t *rt, u32 pos)
static void	f_update_ooo_enq (svm_fifo_t *f, u32 start_pos, u32 end_pos)
static void	f_update_ooo_deq (svm_fifo_t *f, u32 start_pos, u32 end_pos)
static svm_fifo_chunk_t *	f_lookup_clear_enq_chunks (svm_fifo_t *f, svm_fifo_chunk_t *start, u32 end_pos)
static svm_fifo_chunk_t *	f_lookup_clear_deq_chunks (svm_fifo_t *f, svm_fifo_chunk_t *start, u32 end_pos)
void	svm_fifo_free_chunk_lookup (svm_fifo_t *f)
	Cleanup fifo chunk lookup rb tree. More...
void	svm_fifo_free (svm_fifo_t *f)
	Free fifo and associated state. More...
void	svm_fifo_overwrite_head (svm_fifo_t *f, u8 *src, u32 len)
	Overwrite fifo head with new data. More...
static int	f_try_chunk_alloc (svm_fifo_t *f, u32 head, u32 tail, u32 len)
int	svm_fifo_enqueue (svm_fifo_t *f, u32 len, const u8 *src)
	Enqueue data to fifo. More...
int	svm_fifo_enqueue_with_offset (svm_fifo_t *f, u32 offset, u32 len, u8 *src)
	Enqueue a future segment. More...
void	svm_fifo_enqueue_nocopy (svm_fifo_t *f, u32 len)
	Advance tail. More...
static svm_fifo_chunk_t *	f_unlink_chunks (svm_fifo_t *f, u32 end_pos, u8 maybe_ooo)
int	svm_fifo_dequeue (svm_fifo_t *f, u32 len, u8 *dst)
	Dequeue data from fifo. More...
int	svm_fifo_peek (svm_fifo_t *f, u32 offset, u32 len, u8 *dst)
	Peek data from fifo. More...
int	svm_fifo_dequeue_drop (svm_fifo_t *f, u32 len)
	Dequeue and drop bytes from fifo. More...
void	svm_fifo_dequeue_drop_all (svm_fifo_t *f)
	Drop all data from fifo. More...
int	svm_fifo_fill_chunk_list (svm_fifo_t *f)
	Ensure the whole fifo size is writeable. More...
int	svm_fifo_segments (svm_fifo_t *f, svm_fifo_seg_t *fs)
void	svm_fifo_segments_free (svm_fifo_t *f, svm_fifo_seg_t *fs)
void	svm_fifo_clone (svm_fifo_t *df, svm_fifo_t *sf)
	Clones fifo. More...
u32	svm_fifo_n_ooo_segments (svm_fifo_t *f)
	Number of out-of-order segments for fifo. More...
ooo_segment_t *	svm_fifo_first_ooo_segment (svm_fifo_t *f)
	First out-of-order segment for fifo. More...
void	svm_fifo_init_pointers (svm_fifo_t *f, u32 head, u32 tail)
	Set fifo pointers to requested offset. More...
void	svm_fifo_add_subscriber (svm_fifo_t *f, u8 subscriber)
	Add io events subscriber to list. More...
void	svm_fifo_del_subscriber (svm_fifo_t *f, u8 subscriber)
	Remove io events subscriber form list. More...
u8	svm_fifo_is_sane (svm_fifo_t *f)
	Check if fifo is sane. More...
u32	svm_fifo_n_chunks (svm_fifo_t *f)
	Number of chunks linked into the fifo. More...
u8 *	format_ooo_segment (u8 *s, va_list *args)
u8 *	svm_fifo_dump_trace (u8 *s, svm_fifo_t *f)
u8 *	svm_fifo_replay (u8 *s, svm_fifo_t *f, u8 no_read, u8 verbose)
u8 *	format_ooo_list (u8 *s, va_list *args)
u8 *	format_svm_fifo (u8 *s, va_list *args)

Function Documentation

CLIB_MARCH_FN() [1/2]

CLIB_MARCH_FN	(	svm_fifo_copy_to_chunk	,
		void	,
		svm_fifo_t *	f,
		svm_fifo_chunk_t *	c,
		u32	tail_idx,
		const u8 *	src,
		u32	len,
		svm_fifo_chunk_t **	last
	)

Definition at line 24 of file svm_fifo.c.

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CLIB_MARCH_FN() [2/2]

CLIB_MARCH_FN	(	svm_fifo_copy_from_chunk	,
		void	,
		svm_fifo_t *	f,
		svm_fifo_chunk_t *	c,
		u32	head_idx,
		u8 *	dst,
		u32	len,
		svm_fifo_chunk_t **	last
	)

Definition at line 55 of file svm_fifo.c.

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f_find_chunk_rbtree()

static svm_fifo_chunk_t* f_find_chunk_rbtree ( rb_tree_t *  rt, u32  pos  )

static

Definition at line 576 of file svm_fifo.c.

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f_find_node_rbtree()

static rb_node_t* f_find_node_rbtree ( rb_tree_t *  rt, u32  pos  )

static

Definition at line 538 of file svm_fifo.c.

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f_lookup_clear_deq_chunks()

static svm_fifo_chunk_t* f_lookup_clear_deq_chunks ( svm_fifo_t *  f, svm_fifo_chunk_t *  start, u32  end_pos  )

static

Definition at line 727 of file svm_fifo.c.

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f_lookup_clear_enq_chunks()

static svm_fifo_chunk_t* f_lookup_clear_enq_chunks ( svm_fifo_t *  f, svm_fifo_chunk_t *  start, u32  end_pos  )

static

Definition at line 693 of file svm_fifo.c.

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f_try_chunk_alloc()

static int f_try_chunk_alloc ( svm_fifo_t *  f, u32  head, u32  tail, u32  len  )

static

Definition at line 798 of file svm_fifo.c.

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f_unlink_chunks()

static svm_fifo_chunk_t* f_unlink_chunks ( svm_fifo_t *  f, u32  end_pos, u8  maybe_ooo  )

inlinestatic

Definition at line 955 of file svm_fifo.c.

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f_update_ooo_deq()

static void f_update_ooo_deq ( svm_fifo_t *  f, u32  start_pos, u32  end_pos  )

static

Definition at line 644 of file svm_fifo.c.

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f_update_ooo_enq()

static void f_update_ooo_enq ( svm_fifo_t *  f, u32  start_pos, u32  end_pos  )

static

Definition at line 595 of file svm_fifo.c.

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format_ooo_list()

u8* format_ooo_list	(	u8 *	s,
		va_list *	args
	)

Definition at line 1459 of file svm_fifo.c.

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format_ooo_segment()

u8* format_ooo_segment	(	u8 *	s,
		va_list *	args
	)

Definition at line 1366 of file svm_fifo.c.

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format_svm_fifo()

u8* format_svm_fifo	(	u8 *	s,
		va_list *	args
	)

Definition at line 1478 of file svm_fifo.c.

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ooo_segment_add()

static void ooo_segment_add ( svm_fifo_t *  f, u32  offset, u32  head, u32  tail, u32  length  )

static

Add segment to fifo's out-of-order segment list.

Takes care of merging adjacent segments and removing overlapping ones.

Definition at line 176 of file svm_fifo.c.

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ooo_segment_alloc()

static ooo_segment_t* ooo_segment_alloc ( svm_fifo_t *  f, u32  start, u32  length  )

inlinestatic

Definition at line 133 of file svm_fifo.c.

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ooo_segment_end_pos()

static u32 ooo_segment_end_pos ( ooo_segment_t *  s )

inlinestatic

Definition at line 105 of file svm_fifo.c.

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ooo_segment_free()

static void ooo_segment_free ( svm_fifo_t *  f, u32  index  )

inlinestatic

Definition at line 147 of file svm_fifo.c.

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ooo_segment_last()

static __clib_unused ooo_segment_t* ooo_segment_last ( svm_fifo_t *  f )

static

Definition at line 354 of file svm_fifo.c.

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ooo_segment_next()

static ooo_segment_t* ooo_segment_next ( svm_fifo_t *  f, ooo_segment_t *  s  )

inlinestatic

Definition at line 125 of file svm_fifo.c.

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ooo_segment_prev()

static ooo_segment_t* ooo_segment_prev ( svm_fifo_t *  f, ooo_segment_t *  s  )

inlinestatic

Definition at line 117 of file svm_fifo.c.

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ooo_segment_try_collect()

static int ooo_segment_try_collect ( svm_fifo_t *  f, u32  n_bytes_enqueued, u32 *  tail  )

static

Removes segments that can now be enqueued because the fifo's tail has advanced.

Returns the number of bytes added to tail.

Definition at line 306 of file svm_fifo.c.

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svm_fifo_add_subscriber()

void svm_fifo_add_subscriber	(	svm_fifo_t *	f,
		u8	sub
	)

Add io events subscriber to list.

Parameters

f	fifo
sub	subscriber opaque index (typically app worker index)

Definition at line 1234 of file svm_fifo.c.

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svm_fifo_alloc()

svm_fifo_t* svm_fifo_alloc

(

u32

data_size_in_bytes

)

Creates a fifo in the current heap.

Create fifo of requested size.

Fails vs blow up the process

Definition at line 419 of file svm_fifo.c.

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svm_fifo_chunk_alloc()

svm_fifo_chunk_t* svm_fifo_chunk_alloc

(

u32

size

)

Creates a fifo chunk in the current heap.

Allocate a fifo chunk on heap.

Definition at line 455 of file svm_fifo.c.

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svm_fifo_clone()

void svm_fifo_clone	(	svm_fifo_t *	df,
		svm_fifo_t *	sf
	)

Clones fifo.

Clone fifo.

Assumptions:

• no prod and cons are accessing either dest or src fifo
• fifo is not multi chunk

Definition at line 1188 of file svm_fifo.c.

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svm_fifo_copy_from_chunk()

static void svm_fifo_copy_from_chunk ( svm_fifo_t *  f, svm_fifo_chunk_t *  c, u32  head_idx, u8 *  dst, u32  len, svm_fifo_chunk_t **  last  )

inlinestatic

Definition at line 97 of file svm_fifo.c.

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svm_fifo_copy_to_chunk()

static void svm_fifo_copy_to_chunk ( svm_fifo_t *  f, svm_fifo_chunk_t *  c, u32  tail_idx, const u8 *  src, u32  len, svm_fifo_chunk_t **  last  )

inlinestatic

Definition at line 89 of file svm_fifo.c.

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svm_fifo_del_subscriber()

void svm_fifo_del_subscriber	(	svm_fifo_t *	f,
		u8	subscriber
	)

Remove io events subscriber form list.

Parameters

f	fifo
sub	subscriber index to be removed

Definition at line 1242 of file svm_fifo.c.

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svm_fifo_dequeue()

int svm_fifo_dequeue	(	svm_fifo_t *	f,
		u32	len,
		u8 *	dst
	)

Dequeue data from fifo.

Data is dequeued to consumer provided buffer and head is atomically updated.

Parameters

f	fifo
len	length of data to dequeue
dst	buffer to where to dequeue the data

Returns

number of bytes dequeued or error

Definition at line 1007 of file svm_fifo.c.

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svm_fifo_dequeue_drop()

int svm_fifo_dequeue_drop	(	svm_fifo_t *	f,
		u32	len
	)

Dequeue and drop bytes from fifo.

Advances fifo head by requested amount of bytes.

Parameters

f	fifo
len	number of bytes to drop

Returns

number of bytes dropped

Definition at line 1061 of file svm_fifo.c.

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svm_fifo_dequeue_drop_all()

void svm_fifo_dequeue_drop_all

(

svm_fifo_t *

f

)

Drop all data from fifo.

Dequeue and drop all bytes from fifo.

Definition at line 1099 of file svm_fifo.c.

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svm_fifo_dump_trace()

u8* svm_fifo_dump_trace	(	u8 *	s,
		svm_fifo_t *	f
	)

Definition at line 1376 of file svm_fifo.c.

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svm_fifo_enqueue()

int svm_fifo_enqueue	(	svm_fifo_t *	f,
		u32	len,
		const u8 *	src
	)

Enqueue data to fifo.

Data is enqueued and tail pointer is updated atomically. If the new data enqueued partly overlaps or "touches" an out-of-order segment, said segment is "consumed" and the number of bytes returned is appropriately updated.

Parameters

f	fifo
len	length of data to copy
src	buffer from where to copy the data

Returns

number of contiguous bytes that can be consumed or error

Definition at line 836 of file svm_fifo.c.

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svm_fifo_enqueue_nocopy()

void svm_fifo_enqueue_nocopy	(	svm_fifo_t *	f,
		u32	len
	)

Advance tail.

Advance tail pointer.

Definition at line 931 of file svm_fifo.c.

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svm_fifo_enqueue_with_offset()

int svm_fifo_enqueue_with_offset	(	svm_fifo_t *	f,
		u32	offset,
		u32	len,
		u8 *	src
	)

Enqueue a future segment.

Enqueue data to fifo with offset.

Two choices: either copies the entire segment, or copies nothing Returns 0 of the entire segment was copied Returns -1 if none of the segment was copied due to lack of space

Definition at line 894 of file svm_fifo.c.

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svm_fifo_fill_chunk_list()

int svm_fifo_fill_chunk_list

(

svm_fifo_t *

f

)

Ensure the whole fifo size is writeable.

Allocates enough chunks to cover the whole fifo size.

Parameters

f

fifo

Definition at line 1119 of file svm_fifo.c.

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svm_fifo_find_chunk()

static svm_fifo_chunk_t* svm_fifo_find_chunk ( svm_fifo_t *  f, u32  pos  )

static

Find chunk for given byte position.

Parameters

f	fifo
pos	normalized position in fifo

Returns

chunk that includes given position or 0

Definition at line 481 of file svm_fifo.c.

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svm_fifo_find_next_chunk()

static svm_fifo_chunk_t* svm_fifo_find_next_chunk ( svm_fifo_t *  f, svm_fifo_chunk_t *  start, u32  pos  )

static

Definition at line 493 of file svm_fifo.c.

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svm_fifo_first_ooo_segment()

ooo_segment_t* svm_fifo_first_ooo_segment

(

svm_fifo_t *

f

)

First out-of-order segment for fifo.

Parameters

f

fifo

Returns

first out-of-order segment for fifo

Definition at line 1209 of file svm_fifo.c.

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svm_fifo_free()

void svm_fifo_free

(

svm_fifo_t *

f

)

Free fifo and associated state.

Parameters

f

fifo

Definition at line 758 of file svm_fifo.c.

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svm_fifo_free_chunk_lookup()

void svm_fifo_free_chunk_lookup

(

svm_fifo_t *

f

)

Cleanup fifo chunk lookup rb tree.

The rb tree is allocated in segment heap so this should be called with it pushed.

Parameters

f	fifo to cleanup

Definition at line 751 of file svm_fifo.c.

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svm_fifo_free_ooo_data()

void svm_fifo_free_ooo_data

(

svm_fifo_t *

f

)

Cleanup fifo ooo data.

The ooo data is allocated in producer process memory. The fifo segment heap should not be pushed.

Parameters

f	fifo to cleanup

Definition at line 111 of file svm_fifo.c.

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svm_fifo_init()

void svm_fifo_init	(	svm_fifo_t *	f,
		u32	size
	)

Initialize fifo.

Parameters

f	fifo
size	size for fifo

Definition at line 368 of file svm_fifo.c.

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svm_fifo_init_ooo_lookup()

void svm_fifo_init_ooo_lookup	(	svm_fifo_t *	f,
		u8	ooo_type
	)

Initialize rbtrees used for ooo lookups.

Parameters

f	fifo
ooo_type	type of ooo operation (0 enqueue, 1 dequeue)

Definition at line 401 of file svm_fifo.c.

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svm_fifo_init_pointers()

void svm_fifo_init_pointers	(	svm_fifo_t *	f,
		u32	head,
		u32	tail
	)

Set fifo pointers to requested offset.

Init fifo head and tail.

Definition at line 1218 of file svm_fifo.c.

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svm_fifo_is_sane()

u8 svm_fifo_is_sane

(

svm_fifo_t *

f

)

Check if fifo is sane.

Debug only.

Parameters

f

fifo

Returns

1 if sane, 0 otherwise

Definition at line 1257 of file svm_fifo.c.

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svm_fifo_max_read_chunk()

u32 svm_fifo_max_read_chunk

(

svm_fifo_t *

f

)

Max contiguous chunk of data that can be read.

Should only be called by consumers.

Definition at line 507 of file svm_fifo.c.

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svm_fifo_max_write_chunk()

u32 svm_fifo_max_write_chunk

(

svm_fifo_t *

f

)

Max contiguous chunk of data that can be written.

Should only be called by producers

Definition at line 527 of file svm_fifo.c.

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svm_fifo_n_chunks()

u32 svm_fifo_n_chunks

(

svm_fifo_t *

f

)

Number of chunks linked into the fifo.

Parameters

f

fifo

Returns

number of chunks in fifo linked list

Definition at line 1350 of file svm_fifo.c.

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svm_fifo_n_ooo_segments()

u32 svm_fifo_n_ooo_segments

(

svm_fifo_t *

f

)

Number of out-of-order segments for fifo.

Parameters

f

fifo

Returns

number of out of order segments

Definition at line 1203 of file svm_fifo.c.

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svm_fifo_overwrite_head()

void svm_fifo_overwrite_head	(	svm_fifo_t *	f,
		u8 *	src,
		u32	len
	)

Overwrite fifo head with new data.

This should be typically used by dgram transport protocols that need to update the dgram header after dequeueing a chunk of data. It assumes that the dgram header is at most spread over two chunks.

Parameters

f	fifo
src	src of new data
len	length of new data

Definition at line 771 of file svm_fifo.c.

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svm_fifo_peek()

int svm_fifo_peek	(	svm_fifo_t *	f,
		u32	offset,
		u32	len,
		u8 *	dst
	)

Peek data from fifo.

Data is copied from requested offset into provided dst buffer. Head is not updated.

Parameters

f	fifo
offset	offset from which to copy the data
len	length of data to copy
dst	buffer to where to dequeue the data

Returns

number of bytes peeked

Definition at line 1038 of file svm_fifo.c.

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svm_fifo_replay()

u8* svm_fifo_replay	(	u8 *	s,
		svm_fifo_t *	f,
		u8	no_read,
		u8	verbose
	)

Definition at line 1400 of file svm_fifo.c.

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svm_fifo_segments()

int svm_fifo_segments	(	svm_fifo_t *	f,
		svm_fifo_seg_t *	fs
	)

Definition at line 1135 of file svm_fifo.c.

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svm_fifo_segments_free()

void svm_fifo_segments_free	(	svm_fifo_t *	f,
		svm_fifo_seg_t *	fs
	)

Definition at line 1167 of file svm_fifo.c.

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