4a1b3acc90
typedefs are bad, kill them. Cc: Hank Janssen <hjanssen@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
/*
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*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#ifndef _RING_BUFFER_H_
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#define _RING_BUFFER_H_
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#include <linux/scatterlist.h>
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struct hv_ring_buffer {
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/* Offset in bytes from the start of ring data below */
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volatile u32 WriteIndex;
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/* Offset in bytes from the start of ring data below */
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volatile u32 ReadIndex;
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volatile u32 InterruptMask;
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/* Pad it to PAGE_SIZE so that data starts on page boundary */
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u8 Reserved[4084];
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/* NOTE:
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* The InterruptMask field is used only for channels but since our
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* vmbus connection also uses this data structure and its data starts
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* here, we commented out this field.
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*/
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/* volatile u32 InterruptMask; */
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/*
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* Ring data starts here + RingDataStartOffset
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* !!! DO NOT place any fields below this !!!
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*/
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u8 Buffer[0];
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} __attribute__((packed));
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struct hv_ring_buffer_info {
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struct hv_ring_buffer *RingBuffer;
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u32 RingSize; /* Include the shared header */
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spinlock_t ring_lock;
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u32 RingDataSize; /* < ringSize */
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u32 RingDataStartOffset;
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};
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struct hv_ring_buffer_debug_info {
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u32 CurrentInterruptMask;
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u32 CurrentReadIndex;
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u32 CurrentWriteIndex;
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u32 BytesAvailToRead;
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u32 BytesAvailToWrite;
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};
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/* Interface */
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int RingBufferInit(struct hv_ring_buffer_info *RingInfo, void *Buffer,
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u32 BufferLen);
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void RingBufferCleanup(struct hv_ring_buffer_info *RingInfo);
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int RingBufferWrite(struct hv_ring_buffer_info *RingInfo,
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struct scatterlist *sglist,
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u32 sgcount);
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int RingBufferPeek(struct hv_ring_buffer_info *RingInfo, void *Buffer,
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u32 BufferLen);
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int RingBufferRead(struct hv_ring_buffer_info *RingInfo,
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void *Buffer,
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u32 BufferLen,
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u32 Offset);
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u32 GetRingBufferInterruptMask(struct hv_ring_buffer_info *RingInfo);
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void DumpRingInfo(struct hv_ring_buffer_info *RingInfo, char *Prefix);
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void RingBufferGetDebugInfo(struct hv_ring_buffer_info *RingInfo,
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struct hv_ring_buffer_debug_info *debug_info);
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#endif /* _RING_BUFFER_H_ */
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