* Authors:
* Haiyang Zhang <haiyangz@microsoft.com>
* Hank Janssen <hjanssen@microsoft.com>
+ * K. Y. Srinivasan <kys@microsoft.com>
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#define BYTES_AVAIL_TO_WRITE(r, w, z) ((w) >= (r)) ? ((z) - ((w) - (r))) : ((r) - (w))
-/*++
-
-Name:
- hv_get_ringbuffer_availbytes()
-
-Description:
- Get number of bytes available to read and to write to
- for the specified ring buffer
-
---*/
+/*
+ *
+ * hv_get_ringbuffer_availbytes()
+ *
+ * Get number of bytes available to read and to write to
+ * for the specified ring buffer
+ */
static inline void
hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
u32 *read, u32 *write)
*read = rbi->ring_datasize - *write;
}
-/*++
-
-Name:
- hv_get_next_write_location()
-
-Description:
- Get the next write location for the specified ring buffer
-
---*/
+/*
+ * hv_get_next_write_location()
+ *
+ * Get the next write location for the specified ring buffer
+ *
+ */
static inline u32
hv_get_next_write_location(struct hv_ring_buffer_info *ring_info)
{
u32 next = ring_info->ring_buffer->write_index;
- /* ASSERT(next < ring_info->RingDataSize); */
-
return next;
}
-/*++
-
-Name:
- hv_set_next_write_location()
-
-Description:
- Set the next write location for the specified ring buffer
-
---*/
+/*
+ * hv_set_next_write_location()
+ *
+ * Set the next write location for the specified ring buffer
+ *
+ */
static inline void
hv_set_next_write_location(struct hv_ring_buffer_info *ring_info,
u32 next_write_location)
ring_info->ring_buffer->write_index = next_write_location;
}
-/*++
-
-Name:
- hv_get_next_read_location()
-
-Description:
- Get the next read location for the specified ring buffer
-
---*/
+/*
+ * hv_get_next_read_location()
+ *
+ * Get the next read location for the specified ring buffer
+ */
static inline u32
hv_get_next_read_location(struct hv_ring_buffer_info *ring_info)
{
u32 next = ring_info->ring_buffer->read_index;
- /* ASSERT(next < ring_info->RingDataSize); */
-
return next;
}
-/*++
-
-Name:
- hv_get_next_readlocation_withoffset()
-
-Description:
- Get the next read location + offset for the specified ring buffer.
- This allows the caller to skip
-
---*/
+/*
+ * hv_get_next_readlocation_withoffset()
+ *
+ * Get the next read location + offset for the specified ring buffer.
+ * This allows the caller to skip
+ */
static inline u32
hv_get_next_readlocation_withoffset(struct hv_ring_buffer_info *ring_info,
u32 offset)
{
u32 next = ring_info->ring_buffer->read_index;
- /* ASSERT(next < ring_info->RingDataSize); */
next += offset;
next %= ring_info->ring_datasize;
return next;
}
-/*++
-
-Name:
- hv_set_next_read_location()
-
-Description:
- Set the next read location for the specified ring buffer
-
---*/
+/*
+ *
+ * hv_set_next_read_location()
+ *
+ * Set the next read location for the specified ring buffer
+ *
+ */
static inline void
hv_set_next_read_location(struct hv_ring_buffer_info *ring_info,
u32 next_read_location)
}
-/*++
-
-Name:
- hv_get_ring_buffer()
-
-Description:
- Get the start of the ring buffer
-
---*/
+/*
+ *
+ * hv_get_ring_buffer()
+ *
+ * Get the start of the ring buffer
+ */
static inline void *
hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info)
{
}
-/*++
-
-Name:
- hv_get_ring_buffersize()
-
-Description:
- Get the size of the ring buffer
-
---*/
+/*
+ *
+ * hv_get_ring_buffersize()
+ *
+ * Get the size of the ring buffer
+ */
static inline u32
hv_get_ring_buffersize(struct hv_ring_buffer_info *ring_info)
{
return ring_info->ring_datasize;
}
-/*++
-
-Name:
- hv_get_ring_bufferindices()
-
-Description:
- Get the read and write indices as u64 of the specified ring buffer
-
---*/
+/*
+ *
+ * hv_get_ring_bufferindices()
+ *
+ * Get the read and write indices as u64 of the specified ring buffer
+ *
+ */
static inline u64
hv_get_ring_bufferindices(struct hv_ring_buffer_info *ring_info)
{
}
-/*++
-
-Name:
- hv_dump_ring_info()
-
-Description:
- Dump out to console the ring buffer info
-
---*/
+/*
+ *
+ * hv_dump_ring_info()
+ *
+ * Dump out to console the ring buffer info
+ *
+ */
void hv_dump_ring_info(struct hv_ring_buffer_info *ring_info, char *prefix)
{
u32 bytes_avail_towrite;
}
-/* Internal routines */
static u32
hv_copyto_ringbuffer(
-/*++
-
-Name:
- hv_ringbuffer_get_debuginfo()
-
-Description:
- Get various debug metrics for the specified ring buffer
-
---*/
+/*
+ *
+ * hv_ringbuffer_get_debuginfo()
+ *
+ * Get various debug metrics for the specified ring buffer
+ *
+ */
void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
struct hv_ring_buffer_debug_info *debug_info)
{
}
-/*++
-
-Name:
- hv_get_ringbuffer_interrupt_mask()
-
-Description:
- Get the interrupt mask for the specified ring buffer
-
---*/
+/*
+ *
+ * hv_get_ringbuffer_interrupt_mask()
+ *
+ * Get the interrupt mask for the specified ring buffer
+ *
+ */
u32 hv_get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *rbi)
{
return rbi->ring_buffer->interrupt_mask;
}
-/*++
-
-Name:
- hv_ringbuffer_init()
-
-Description:
- Initialize the ring buffer
-
---*/
+/*
+ *
+ * hv_ringbuffer_init()
+ *
+ *Initialize the ring buffer
+ *
+ */
int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
void *buffer, u32 buflen)
{
return 0;
}
-/*++
-
-Name:
- hv_ringbuffer_cleanup()
-
-Description:
- Cleanup the ring buffer
-
---*/
+/*
+ *
+ * hv_ringbuffer_cleanup()
+ *
+ * Cleanup the ring buffer
+ *
+ */
void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info)
{
}
-/*++
-
-Name:
- hv_ringbuffer_write()
-
-Description:
- Write to the ring buffer
-
---*/
+/*
+ *
+ * hv_ringbuffer_write()
+ *
+ * Write to the ring buffer
+ *
+ */
int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info,
struct scatterlist *sglist, u32 sgcount)
{
&bytes_avail_toread,
&bytes_avail_towrite);
- /* Dumpring_info(Outring_info, "BEFORE "); */
/* If there is only room for the packet, assume it is full. */
/* Otherwise, the next time around, we think the ring buffer */
/* Now, update the 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);
return 0;
}
-/*++
-
-Name:
- hv_ringbuffer_peek()
-
-Description:
- Read without advancing the read index
-
---*/
+/*
+ *
+ * hv_ringbuffer_peek()
+ *
+ * Read without advancing the read index
+ *
+ */
int hv_ringbuffer_peek(struct hv_ring_buffer_info *Inring_info,
void *Buffer, u32 buflen)
{
/* Make sure there is something to read */
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);
}
-/*++
-
-Name:
- hv_ringbuffer_read()
-
-Description:
- Read and advance the read index
-
---*/
+/*
+ *
+ * hv_ringbuffer_read()
+ *
+ * Read and advance the read index
+ *
+ */
int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info, void *buffer,
u32 buflen, u32 offset)
{
&bytes_avail_toread,
&bytes_avail_towrite);
- /* Dumpring_info(Inring_info, "BEFORE "); */
-
/* Make sure there is something to read */
if (bytes_avail_toread < buflen) {
spin_unlock_irqrestore(&inring_info->ring_lock, flags);
/* Update the read index */
hv_set_next_read_location(inring_info, next_read_location);
- /* Dumpring_info(Inring_info, "AFTER "); */
-
spin_unlock_irqrestore(&inring_info->ring_lock, flags);
return 0;
}
-/*++
-
-Name:
- hv_copyto_ringbuffer()
-
-Description:
- Helper routine to copy from source to ring buffer.
- Assume there is enough room. Handles wrap-around in dest case only!!
-
---*/
+/*
+ *
+ * hv_copyto_ringbuffer()
+ *
+ * Helper routine to copy from source to ring buffer.
+ * Assume there is enough room. Handles wrap-around in dest case only!!
+ *
+ */
static u32
hv_copyto_ringbuffer(
struct hv_ring_buffer_info *ring_info,
}
-/*++
-
-Name:
- hv_copyfrom_ringbuffer()
-
-Description:
- Helper routine to copy to source from ring buffer.
- Assume there is enough room. Handles wrap-around in src case only!!
-
---*/
+/*
+ *
+ * hv_copyfrom_ringbuffer()
+ *
+ * Helper routine to copy to source from ring buffer.
+ * Assume there is enough room. Handles wrap-around in src case only!!
+ *
+ */
static u32
hv_copyfrom_ringbuffer(
struct hv_ring_buffer_info *ring_info,
return start_read_offset;
}
-
-/* eof */
projects / mv-sheeva.git / commitdiff