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128 lines
3.1 KiB
128 lines
3.1 KiB
/* 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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