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5.4.0-216-generic
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rdma
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Filename :
rdmavt_mr.h
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#ifndef DEF_RDMAVT_INCMR_H #define DEF_RDMAVT_INCMR_H /* * Copyright(c) 2016 Intel Corporation. * * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * BSD LICENSE * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * - Neither the name of Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ /* * For Memory Regions. This stuff should probably be moved into rdmavt/mr.h once * drivers no longer need access to the MR directly. */ #include <linux/percpu-refcount.h> /* * A segment is a linear region of low physical memory. * Used by the verbs layer. */ struct rvt_seg { void *vaddr; size_t length; }; /* The number of rvt_segs that fit in a page. */ #define RVT_SEGSZ (PAGE_SIZE / sizeof(struct rvt_seg)) struct rvt_segarray { struct rvt_seg segs[RVT_SEGSZ]; }; struct rvt_mregion { struct ib_pd *pd; /* shares refcnt of ibmr.pd */ u64 user_base; /* User's address for this region */ u64 iova; /* IB start address of this region */ size_t length; u32 lkey; u32 offset; /* offset (bytes) to start of region */ int access_flags; u32 max_segs; /* number of rvt_segs in all the arrays */ u32 mapsz; /* size of the map array */ atomic_t lkey_invalid; /* true if current lkey is invalid */ u8 page_shift; /* 0 - non unform/non powerof2 sizes */ u8 lkey_published; /* in global table */ struct percpu_ref refcount; struct completion comp; /* complete when refcount goes to zero */ struct rvt_segarray *map[0]; /* the segments */ }; #define RVT_MAX_LKEY_TABLE_BITS 23 struct rvt_lkey_table { /* read mostly fields */ u32 max; /* size of the table */ u32 shift; /* lkey/rkey shift */ struct rvt_mregion __rcu **table; /* writeable fields */ /* protect changes in this struct */ spinlock_t lock ____cacheline_aligned_in_smp; u32 next; /* next unused index (speeds search) */ u32 gen; /* generation count */ }; /* * These keep track of the copy progress within a memory region. * Used by the verbs layer. */ struct rvt_sge { struct rvt_mregion *mr; void *vaddr; /* kernel virtual address of segment */ u32 sge_length; /* length of the SGE */ u32 length; /* remaining length of the segment */ u16 m; /* current index: mr->map[m] */ u16 n; /* current index: mr->map[m]->segs[n] */ }; struct rvt_sge_state { struct rvt_sge *sg_list; /* next SGE to be used if any */ struct rvt_sge sge; /* progress state for the current SGE */ u32 total_len; u8 num_sge; }; static inline void rvt_put_mr(struct rvt_mregion *mr) { percpu_ref_put(&mr->refcount); } static inline void rvt_get_mr(struct rvt_mregion *mr) { percpu_ref_get(&mr->refcount); } static inline void rvt_put_ss(struct rvt_sge_state *ss) { while (ss->num_sge) { rvt_put_mr(ss->sge.mr); if (--ss->num_sge) ss->sge = *ss->sg_list++; } } static inline u32 rvt_get_sge_length(struct rvt_sge *sge, u32 length) { u32 len = sge->length; if (len > length) len = length; if (len > sge->sge_length) len = sge->sge_length; return len; } static inline void rvt_update_sge(struct rvt_sge_state *ss, u32 length, bool release) { struct rvt_sge *sge = &ss->sge; sge->vaddr += length; sge->length -= length; sge->sge_length -= length; if (sge->sge_length == 0) { if (release) rvt_put_mr(sge->mr); if (--ss->num_sge) *sge = *ss->sg_list++; } else if (sge->length == 0 && sge->mr->lkey) { if (++sge->n >= RVT_SEGSZ) { if (++sge->m >= sge->mr->mapsz) return; sge->n = 0; } sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr; sge->length = sge->mr->map[sge->m]->segs[sge->n].length; } } static inline void rvt_skip_sge(struct rvt_sge_state *ss, u32 length, bool release) { struct rvt_sge *sge = &ss->sge; while (length) { u32 len = rvt_get_sge_length(sge, length); WARN_ON_ONCE(len == 0); rvt_update_sge(ss, len, release); length -= len; } } bool rvt_ss_has_lkey(struct rvt_sge_state *ss, u32 lkey); bool rvt_mr_has_lkey(struct rvt_mregion *mr, u32 lkey); #endif /* DEF_RDMAVT_INCMRH */