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Staging: hv: Cleanup comments in ring_buffer.c

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Cleanup comments in ring_buffer.c

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-05-10 07:55:30 -07:00 committed by Greg Kroah-Hartman
parent 2b8a912ef2
commit b2a5a58551
1 changed files with 129 additions and 194 deletions
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323
drivers/staging/hv/ring_buffer.c
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@ -18,6 +18,7 @@
* Authors: * Authors:
* Haiyang Zhang <haiyangz@microsoft.com> * Haiyang Zhang <haiyangz@microsoft.com>
* Hank Janssen <hjanssen@microsoft.com> * Hank Janssen <hjanssen@microsoft.com>
* K. Y. Srinivasan <kys@microsoft.com>
* *
*/ */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@ -35,16 +36,13 @@
#define BYTES_AVAIL_TO_WRITE(r, w, z) ((w) >= (r)) ? ((z) - ((w) - (r))) : ((r) - (w)) #define BYTES_AVAIL_TO_WRITE(r, w, z) ((w) >= (r)) ? ((z) - ((w) - (r))) : ((r) - (w))
/*++ /*
*
Name: * hv_get_ringbuffer_availbytes()
hv_get_ringbuffer_availbytes() *
* Get number of bytes available to read and to write to
Description: * for the specified ring buffer
Get number of bytes available to read and to write to */
for the specified ring buffer
--*/
static inline void static inline void
hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi, hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
u32 *read, u32 *write) u32 *read, u32 *write)
@ -59,34 +57,26 @@ hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
*read = rbi->ring_datasize - *write; *read = rbi->ring_datasize - *write;
} }
/*++ /*
* hv_get_next_write_location()
Name: *
hv_get_next_write_location() * Get the next write location for the specified ring buffer
*
Description: */
Get the next write location for the specified ring buffer
--*/
static inline u32 static inline u32
hv_get_next_write_location(struct hv_ring_buffer_info *ring_info) hv_get_next_write_location(struct hv_ring_buffer_info *ring_info)
{ {
u32 next = ring_info->ring_buffer->write_index; u32 next = ring_info->ring_buffer->write_index;
/* ASSERT(next < ring_info->RingDataSize); */
return next; return next;
} }
/*++ /*
* hv_set_next_write_location()
Name: *
hv_set_next_write_location() * Set the next write location for the specified ring buffer
*
Description: */
Set the next write location for the specified ring buffer
--*/
static inline void static inline void
hv_set_next_write_location(struct hv_ring_buffer_info *ring_info, hv_set_next_write_location(struct hv_ring_buffer_info *ring_info,
u32 next_write_location) u32 next_write_location)
@ -94,57 +84,44 @@ hv_set_next_write_location(struct hv_ring_buffer_info *ring_info,
ring_info->ring_buffer->write_index = next_write_location; ring_info->ring_buffer->write_index = next_write_location;
} }
/*++ /*
* hv_get_next_read_location()
Name: *
hv_get_next_read_location() * Get the next read location for the specified ring buffer
*/
Description:
Get the next read location for the specified ring buffer
--*/
static inline u32 static inline u32
hv_get_next_read_location(struct hv_ring_buffer_info *ring_info) hv_get_next_read_location(struct hv_ring_buffer_info *ring_info)
{ {
u32 next = ring_info->ring_buffer->read_index; u32 next = ring_info->ring_buffer->read_index;
/* ASSERT(next < ring_info->RingDataSize); */
return next; return next;
} }
/*++ /*
* hv_get_next_readlocation_withoffset()
Name: *
hv_get_next_readlocation_withoffset() * Get the next read location + offset for the specified ring buffer.
* This allows the caller to skip
Description: */
Get the next read location + offset for the specified ring buffer.
This allows the caller to skip
--*/
static inline u32 static inline u32
hv_get_next_readlocation_withoffset(struct hv_ring_buffer_info *ring_info, hv_get_next_readlocation_withoffset(struct hv_ring_buffer_info *ring_info,
u32 offset) u32 offset)
{ {
u32 next = ring_info->ring_buffer->read_index; u32 next = ring_info->ring_buffer->read_index;
/* ASSERT(next < ring_info->RingDataSize); */
next += offset; next += offset;
next %= ring_info->ring_datasize; next %= ring_info->ring_datasize;
return next; return next;
} }
/*++ /*
*
Name: * hv_set_next_read_location()
hv_set_next_read_location() *
* Set the next read location for the specified ring buffer
Description: *
Set the next read location for the specified ring buffer */
--*/
static inline void static inline void
hv_set_next_read_location(struct hv_ring_buffer_info *ring_info, hv_set_next_read_location(struct hv_ring_buffer_info *ring_info,
u32 next_read_location) u32 next_read_location)
@ -153,15 +130,12 @@ hv_set_next_read_location(struct hv_ring_buffer_info *ring_info,
} }
/*++ /*
*
Name: * hv_get_ring_buffer()
hv_get_ring_buffer() *
* Get the start of the ring buffer
Description: */
Get the start of the ring buffer
--*/
static inline void * static inline void *
hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info) hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info)
{ {
@ -169,30 +143,25 @@ hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info)
} }
/*++ /*
*
Name: * hv_get_ring_buffersize()
hv_get_ring_buffersize() *
* Get the size of the ring buffer
Description: */
Get the size of the ring buffer
--*/
static inline u32 static inline u32
hv_get_ring_buffersize(struct hv_ring_buffer_info *ring_info) hv_get_ring_buffersize(struct hv_ring_buffer_info *ring_info)
{ {
return ring_info->ring_datasize; return ring_info->ring_datasize;
} }
/*++ /*
*
Name: * hv_get_ring_bufferindices()
hv_get_ring_bufferindices() *
* Get the read and write indices as u64 of the specified ring buffer
Description: *
Get the read and write indices as u64 of the specified ring buffer */
--*/
static inline u64 static inline u64
hv_get_ring_bufferindices(struct hv_ring_buffer_info *ring_info) hv_get_ring_bufferindices(struct hv_ring_buffer_info *ring_info)
{ {
@ -200,15 +169,13 @@ hv_get_ring_bufferindices(struct hv_ring_buffer_info *ring_info)
} }
/*++ /*
*
Name: * hv_dump_ring_info()
hv_dump_ring_info() *
* Dump out to console the ring buffer info
Description: *
Dump out to console the ring buffer info */
--*/
void hv_dump_ring_info(struct hv_ring_buffer_info *ring_info, char *prefix) void hv_dump_ring_info(struct hv_ring_buffer_info *ring_info, char *prefix)
{ {
u32 bytes_avail_towrite; u32 bytes_avail_towrite;
@ -232,7 +199,6 @@ void hv_dump_ring_info(struct hv_ring_buffer_info *ring_info, char *prefix)
} }
/* Internal routines */
static u32 static u32
hv_copyto_ringbuffer( hv_copyto_ringbuffer(
@ -250,15 +216,13 @@ hv_copyfrom_ringbuffer(
/*++ /*
*
Name: * hv_ringbuffer_get_debuginfo()
hv_ringbuffer_get_debuginfo() *
* Get various debug metrics for the specified ring buffer
Description: *
Get various debug metrics for the specified ring buffer */
--*/
void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info, void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
struct hv_ring_buffer_debug_info *debug_info) struct hv_ring_buffer_debug_info *debug_info)
{ {
@ -282,29 +246,25 @@ void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
} }
/*++ /*
*
Name: * hv_get_ringbuffer_interrupt_mask()
hv_get_ringbuffer_interrupt_mask() *
* Get the interrupt mask for the specified ring buffer
Description: *
Get the interrupt mask for the specified ring buffer */
--*/
u32 hv_get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *rbi) u32 hv_get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *rbi)
{ {
return rbi->ring_buffer->interrupt_mask; return rbi->ring_buffer->interrupt_mask;
} }
/*++ /*
*
Name: * hv_ringbuffer_init()
hv_ringbuffer_init() *
*Initialize the ring buffer
Description: *
Initialize the ring buffer */
--*/
int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
void *buffer, u32 buflen) void *buffer, u32 buflen)
{ {
@ -325,28 +285,24 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
return 0; return 0;
} }
/*++ /*
*
Name: * hv_ringbuffer_cleanup()
hv_ringbuffer_cleanup() *
* Cleanup the ring buffer
Description: *
Cleanup the ring buffer */
--*/
void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info) void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info)
{ {
} }
/*++ /*
*
Name: * hv_ringbuffer_write()
hv_ringbuffer_write() *
* Write to the ring buffer
Description: *
Write to the ring buffer */
--*/
int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info, int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info,
struct scatterlist *sglist, u32 sgcount) struct scatterlist *sglist, u32 sgcount)
{ {
@ -373,7 +329,6 @@ int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info,
&bytes_avail_toread, &bytes_avail_toread,
&bytes_avail_towrite); &bytes_avail_towrite);
/* Dumpring_info(Outring_info, "BEFORE "); */
/* If there is only room for the packet, assume it is full. */ /* If there is only room for the packet, assume it is full. */
/* Otherwise, the next time around, we think the ring buffer */ /* Otherwise, the next time around, we think the ring buffer */
@ -408,22 +363,19 @@ int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info,
/* Now, update the write location */ /* Now, update the write location */
hv_set_next_write_location(outring_info, next_write_location); hv_set_next_write_location(outring_info, next_write_location);
/* Dumpring_info(Outring_info, "AFTER "); */
spin_unlock_irqrestore(&outring_info->ring_lock, flags); spin_unlock_irqrestore(&outring_info->ring_lock, flags);
return 0; return 0;
} }
/*++ /*
*
Name: * hv_ringbuffer_peek()
hv_ringbuffer_peek() *
* Read without advancing the read index
Description: *
Read without advancing the read index */
--*/
int hv_ringbuffer_peek(struct hv_ring_buffer_info *Inring_info, int hv_ringbuffer_peek(struct hv_ring_buffer_info *Inring_info,
void *Buffer, u32 buflen) void *Buffer, u32 buflen)
{ {
@ -440,11 +392,6 @@ int hv_ringbuffer_peek(struct hv_ring_buffer_info *Inring_info,
/* Make sure there is something to read */ /* Make sure there is something to read */
if (bytes_avail_toread < buflen) { if (bytes_avail_toread < buflen) {
/* DPRINT_DBG(VMBUS,
"got callback but not enough to read "
"<avail to read %d read size %d>!!",
bytes_avail_toread,
BufferLen); */
spin_unlock_irqrestore(&Inring_info->ring_lock, flags); spin_unlock_irqrestore(&Inring_info->ring_lock, flags);
@ -465,15 +412,13 @@ int hv_ringbuffer_peek(struct hv_ring_buffer_info *Inring_info,
} }
/*++ /*
*
Name: * hv_ringbuffer_read()
hv_ringbuffer_read() *
* Read and advance the read index
Description: *
Read and advance the read index */
--*/
int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info, void *buffer, int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info, void *buffer,
u32 buflen, u32 offset) u32 buflen, u32 offset)
{ {
@ -492,8 +437,6 @@ int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info, void *buffer,
&bytes_avail_toread, &bytes_avail_toread,
&bytes_avail_towrite); &bytes_avail_towrite);
/* Dumpring_info(Inring_info, "BEFORE "); */
/* Make sure there is something to read */ /* Make sure there is something to read */
if (bytes_avail_toread < buflen) { if (bytes_avail_toread < buflen) {
spin_unlock_irqrestore(&inring_info->ring_lock, flags); spin_unlock_irqrestore(&inring_info->ring_lock, flags);
@ -522,24 +465,20 @@ int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info, void *buffer,
/* Update the read index */ /* Update the read index */
hv_set_next_read_location(inring_info, next_read_location); hv_set_next_read_location(inring_info, next_read_location);
/* Dumpring_info(Inring_info, "AFTER "); */
spin_unlock_irqrestore(&inring_info->ring_lock, flags); spin_unlock_irqrestore(&inring_info->ring_lock, flags);
return 0; return 0;
} }
/*++ /*
*
Name: * hv_copyto_ringbuffer()
hv_copyto_ringbuffer() *
* Helper routine to copy from source to ring buffer.
Description: * Assume there is enough room. Handles wrap-around in dest case only!!
Helper routine to copy from source to ring buffer. *
Assume there is enough room. Handles wrap-around in dest case only!! */
--*/
static u32 static u32
hv_copyto_ringbuffer( hv_copyto_ringbuffer(
struct hv_ring_buffer_info *ring_info, struct hv_ring_buffer_info *ring_info,
@ -566,16 +505,14 @@ hv_copyto_ringbuffer(
} }
/*++ /*
*
Name: * hv_copyfrom_ringbuffer()
hv_copyfrom_ringbuffer() *
* Helper routine to copy to source from ring buffer.
Description: * Assume there is enough room. Handles wrap-around in src case only!!
Helper routine to copy to source from ring buffer. *
Assume there is enough room. Handles wrap-around in src case only!! */
--*/
static u32 static u32
hv_copyfrom_ringbuffer( hv_copyfrom_ringbuffer(
struct hv_ring_buffer_info *ring_info, struct hv_ring_buffer_info *ring_info,
@ -605,5 +542,3 @@ hv_copyfrom_ringbuffer(
return start_read_offset; return start_read_offset;
} }
/* eof */