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![Leon Romanovsky](/assets/img/avatar_default.png)
The header files in RDMA subsystem are dual licensed and can be described by simple SPDX tag, so replace all of them at once together with making them use the same coding style for header guard defines. Link: https://lore.kernel.org/r/20200719072521.135260-1-leon@kernel.org Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
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/*
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* Copyright(c) 2016 Intel Corporation.
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*/
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#ifndef DEF_RDMAVT_INCMR_H
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#define DEF_RDMAVT_INCMR_H
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/*
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* For Memory Regions. This stuff should probably be moved into rdmavt/mr.h once
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* drivers no longer need access to the MR directly.
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*/
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#include <linux/percpu-refcount.h>
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/*
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* A segment is a linear region of low physical memory.
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* Used by the verbs layer.
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*/
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struct rvt_seg {
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void *vaddr;
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size_t length;
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};
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/* The number of rvt_segs that fit in a page. */
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#define RVT_SEGSZ (PAGE_SIZE / sizeof(struct rvt_seg))
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struct rvt_segarray {
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struct rvt_seg segs[RVT_SEGSZ];
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};
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struct rvt_mregion {
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struct ib_pd *pd; /* shares refcnt of ibmr.pd */
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u64 user_base; /* User's address for this region */
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u64 iova; /* IB start address of this region */
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size_t length;
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u32 lkey;
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u32 offset; /* offset (bytes) to start of region */
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int access_flags;
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u32 max_segs; /* number of rvt_segs in all the arrays */
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u32 mapsz; /* size of the map array */
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atomic_t lkey_invalid; /* true if current lkey is invalid */
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u8 page_shift; /* 0 - non unform/non powerof2 sizes */
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u8 lkey_published; /* in global table */
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struct percpu_ref refcount;
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struct completion comp; /* complete when refcount goes to zero */
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struct rvt_segarray *map[]; /* the segments */
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};
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#define RVT_MAX_LKEY_TABLE_BITS 23
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struct rvt_lkey_table {
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/* read mostly fields */
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u32 max; /* size of the table */
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u32 shift; /* lkey/rkey shift */
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struct rvt_mregion __rcu **table;
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/* writeable fields */
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/* protect changes in this struct */
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spinlock_t lock ____cacheline_aligned_in_smp;
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u32 next; /* next unused index (speeds search) */
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u32 gen; /* generation count */
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};
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/*
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* These keep track of the copy progress within a memory region.
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* Used by the verbs layer.
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*/
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struct rvt_sge {
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struct rvt_mregion *mr;
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void *vaddr; /* kernel virtual address of segment */
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u32 sge_length; /* length of the SGE */
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u32 length; /* remaining length of the segment */
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u16 m; /* current index: mr->map[m] */
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u16 n; /* current index: mr->map[m]->segs[n] */
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};
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struct rvt_sge_state {
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struct rvt_sge *sg_list; /* next SGE to be used if any */
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struct rvt_sge sge; /* progress state for the current SGE */
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u32 total_len;
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u8 num_sge;
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};
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static inline void rvt_put_mr(struct rvt_mregion *mr)
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{
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percpu_ref_put(&mr->refcount);
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}
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static inline void rvt_get_mr(struct rvt_mregion *mr)
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{
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percpu_ref_get(&mr->refcount);
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}
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static inline void rvt_put_ss(struct rvt_sge_state *ss)
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{
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while (ss->num_sge) {
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rvt_put_mr(ss->sge.mr);
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if (--ss->num_sge)
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ss->sge = *ss->sg_list++;
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}
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}
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static inline u32 rvt_get_sge_length(struct rvt_sge *sge, u32 length)
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{
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u32 len = sge->length;
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if (len > length)
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len = length;
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if (len > sge->sge_length)
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len = sge->sge_length;
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return len;
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}
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static inline void rvt_update_sge(struct rvt_sge_state *ss, u32 length,
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bool release)
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{
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struct rvt_sge *sge = &ss->sge;
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sge->vaddr += length;
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sge->length -= length;
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sge->sge_length -= length;
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if (sge->sge_length == 0) {
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if (release)
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rvt_put_mr(sge->mr);
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if (--ss->num_sge)
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*sge = *ss->sg_list++;
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} else if (sge->length == 0 && sge->mr->lkey) {
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if (++sge->n >= RVT_SEGSZ) {
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if (++sge->m >= sge->mr->mapsz)
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return;
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sge->n = 0;
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}
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sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr;
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sge->length = sge->mr->map[sge->m]->segs[sge->n].length;
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}
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}
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static inline void rvt_skip_sge(struct rvt_sge_state *ss, u32 length,
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bool release)
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{
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struct rvt_sge *sge = &ss->sge;
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while (length) {
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u32 len = rvt_get_sge_length(sge, length);
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WARN_ON_ONCE(len == 0);
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rvt_update_sge(ss, len, release);
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length -= len;
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}
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}
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bool rvt_ss_has_lkey(struct rvt_sge_state *ss, u32 lkey);
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bool rvt_mr_has_lkey(struct rvt_mregion *mr, u32 lkey);
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#endif /* DEF_RDMAVT_INCMRH */
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