Viewing file:  svc_rdma_pcl.h (3.13 KB) -rw-r--r--
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2020, Oracle and/or its affiliates
*/
#ifndef SVC_RDMA_PCL_H
#define SVC_RDMA_PCL_H
#include <linux/list.h>
struct svc_rdma_segment {
u32 rs_handle;
u32 rs_length;
u64 rs_offset;
};
struct svc_rdma_chunk {
struct list_head ch_list;
u32 ch_position;
u32 ch_length;
u32 ch_payload_length;
u32 ch_segcount;
struct svc_rdma_segment ch_segments[];
};
struct svc_rdma_pcl {
unsigned int cl_count;
struct list_head cl_chunks;
};
/**
* pcl_init - Initialize a parsed chunk list
* @pcl: parsed chunk list to initialize
*
*/
static inline void pcl_init(struct svc_rdma_pcl *pcl)
{
INIT_LIST_HEAD(&pcl->cl_chunks);
}
/**
* pcl_is_empty - Return true if parsed chunk list is empty
* @pcl: parsed chunk list
*
*/
static inline bool pcl_is_empty(const struct svc_rdma_pcl *pcl)
{
return list_empty(&pcl->cl_chunks);
}
/**
* pcl_first_chunk - Return first chunk in a parsed chunk list
* @pcl: parsed chunk list
*
* Returns the first chunk in the list, or NULL if the list is empty.
*/
static inline struct svc_rdma_chunk *
pcl_first_chunk(const struct svc_rdma_pcl *pcl)
{
if (pcl_is_empty(pcl))
return NULL;
return list_first_entry(&pcl->cl_chunks, struct svc_rdma_chunk,
ch_list);
}
/**
* pcl_next_chunk - Return next chunk in a parsed chunk list
* @pcl: a parsed chunk list
* @chunk: chunk in @pcl
*
* Returns the next chunk in the list, or NULL if @chunk is already last.
*/
static inline struct svc_rdma_chunk *
pcl_next_chunk(const struct svc_rdma_pcl *pcl, struct svc_rdma_chunk *chunk)
{
if (list_is_last(&chunk->ch_list, &pcl->cl_chunks))
return NULL;
return list_next_entry(chunk, ch_list);
}
/**
* pcl_for_each_chunk - Iterate over chunks in a parsed chunk list
* @pos: the loop cursor
* @pcl: a parsed chunk list
*/
#define pcl_for_each_chunk(pos, pcl) \
for (pos = list_first_entry(&(pcl)->cl_chunks, struct svc_rdma_chunk, ch_list); \
&pos->ch_list != &(pcl)->cl_chunks; \
pos = list_next_entry(pos, ch_list))
/**
* pcl_for_each_segment - Iterate over segments in a parsed chunk
* @pos: the loop cursor
* @chunk: a parsed chunk
*/
#define pcl_for_each_segment(pos, chunk) \
for (pos = &(chunk)->ch_segments[0]; \
pos <= &(chunk)->ch_segments[(chunk)->ch_segcount - 1]; \
pos++)
/**
* pcl_chunk_end_offset - Return offset of byte range following @chunk
* @chunk: chunk in @pcl
*
* Returns starting offset of the region just after @chunk
*/
static inline unsigned int
pcl_chunk_end_offset(const struct svc_rdma_chunk *chunk)
{
return xdr_align_size(chunk->ch_position + chunk->ch_payload_length);
}
struct svc_rdma_recv_ctxt;
extern void pcl_free(struct svc_rdma_pcl *pcl);
extern bool pcl_alloc_call(struct svc_rdma_recv_ctxt *rctxt, __be32 *p);
extern bool pcl_alloc_read(struct svc_rdma_recv_ctxt *rctxt, __be32 *p);
extern bool pcl_alloc_write(struct svc_rdma_recv_ctxt *rctxt,
struct svc_rdma_pcl *pcl, __be32 *p);
extern int pcl_process_nonpayloads(const struct svc_rdma_pcl *pcl,
const struct xdr_buf *xdr,
int (*actor)(const struct xdr_buf *,
void *),
void *data);
#endif /* SVC_RDMA_PCL_H */
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