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