cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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svc_rdma_pcl.h (3208B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (c) 2020, Oracle and/or its affiliates
      4 */
      5
      6#ifndef SVC_RDMA_PCL_H
      7#define SVC_RDMA_PCL_H
      8
      9#include <linux/list.h>
     10
     11struct svc_rdma_segment {
     12	u32			rs_handle;
     13	u32			rs_length;
     14	u64			rs_offset;
     15};
     16
     17struct svc_rdma_chunk {
     18	struct list_head	ch_list;
     19
     20	u32			ch_position;
     21	u32			ch_length;
     22	u32			ch_payload_length;
     23
     24	u32			ch_segcount;
     25	struct svc_rdma_segment	ch_segments[];
     26};
     27
     28struct svc_rdma_pcl {
     29	unsigned int		cl_count;
     30	struct list_head	cl_chunks;
     31};
     32
     33/**
     34 * pcl_init - Initialize a parsed chunk list
     35 * @pcl: parsed chunk list to initialize
     36 *
     37 */
     38static inline void pcl_init(struct svc_rdma_pcl *pcl)
     39{
     40	INIT_LIST_HEAD(&pcl->cl_chunks);
     41}
     42
     43/**
     44 * pcl_is_empty - Return true if parsed chunk list is empty
     45 * @pcl: parsed chunk list
     46 *
     47 */
     48static inline bool pcl_is_empty(const struct svc_rdma_pcl *pcl)
     49{
     50	return list_empty(&pcl->cl_chunks);
     51}
     52
     53/**
     54 * pcl_first_chunk - Return first chunk in a parsed chunk list
     55 * @pcl: parsed chunk list
     56 *
     57 * Returns the first chunk in the list, or NULL if the list is empty.
     58 */
     59static inline struct svc_rdma_chunk *
     60pcl_first_chunk(const struct svc_rdma_pcl *pcl)
     61{
     62	if (pcl_is_empty(pcl))
     63		return NULL;
     64	return list_first_entry(&pcl->cl_chunks, struct svc_rdma_chunk,
     65				ch_list);
     66}
     67
     68/**
     69 * pcl_next_chunk - Return next chunk in a parsed chunk list
     70 * @pcl: a parsed chunk list
     71 * @chunk: chunk in @pcl
     72 *
     73 * Returns the next chunk in the list, or NULL if @chunk is already last.
     74 */
     75static inline struct svc_rdma_chunk *
     76pcl_next_chunk(const struct svc_rdma_pcl *pcl, struct svc_rdma_chunk *chunk)
     77{
     78	if (list_is_last(&chunk->ch_list, &pcl->cl_chunks))
     79		return NULL;
     80	return list_next_entry(chunk, ch_list);
     81}
     82
     83/**
     84 * pcl_for_each_chunk - Iterate over chunks in a parsed chunk list
     85 * @pos: the loop cursor
     86 * @pcl: a parsed chunk list
     87 */
     88#define pcl_for_each_chunk(pos, pcl) \
     89	for (pos = list_first_entry(&(pcl)->cl_chunks, struct svc_rdma_chunk, ch_list); \
     90	     &pos->ch_list != &(pcl)->cl_chunks; \
     91	     pos = list_next_entry(pos, ch_list))
     92
     93/**
     94 * pcl_for_each_segment - Iterate over segments in a parsed chunk
     95 * @pos: the loop cursor
     96 * @chunk: a parsed chunk
     97 */
     98#define pcl_for_each_segment(pos, chunk) \
     99	for (pos = &(chunk)->ch_segments[0]; \
    100	     pos <= &(chunk)->ch_segments[(chunk)->ch_segcount - 1]; \
    101	     pos++)
    102
    103/**
    104 * pcl_chunk_end_offset - Return offset of byte range following @chunk
    105 * @chunk: chunk in @pcl
    106 *
    107 * Returns starting offset of the region just after @chunk
    108 */
    109static inline unsigned int
    110pcl_chunk_end_offset(const struct svc_rdma_chunk *chunk)
    111{
    112	return xdr_align_size(chunk->ch_position + chunk->ch_payload_length);
    113}
    114
    115struct svc_rdma_recv_ctxt;
    116
    117extern void pcl_free(struct svc_rdma_pcl *pcl);
    118extern bool pcl_alloc_call(struct svc_rdma_recv_ctxt *rctxt, __be32 *p);
    119extern bool pcl_alloc_read(struct svc_rdma_recv_ctxt *rctxt, __be32 *p);
    120extern bool pcl_alloc_write(struct svc_rdma_recv_ctxt *rctxt,
    121			    struct svc_rdma_pcl *pcl, __be32 *p);
    122extern int pcl_process_nonpayloads(const struct svc_rdma_pcl *pcl,
    123				   const struct xdr_buf *xdr,
    124				   int (*actor)(const struct xdr_buf *,
    125						void *),
    126				   void *data);
    127
    128#endif	/* SVC_RDMA_PCL_H */