510 строки
16 KiB
C
510 строки
16 KiB
C
#ifndef DEF_RDMA_VT_H
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#define DEF_RDMA_VT_H
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/*
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* Copyright(c) 2015 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* Structure that low level drivers will populate in order to register with the
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* rdmavt layer.
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*/
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#include "ib_verbs.h"
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#define RVT_MULTICAST_LID_BASE 0xC000
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#define RVT_PERMISSIVE_LID 0xFFFF
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/*
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* For some of the IBTA objects there will likely be some
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* initializations required. We need flags to determine whether it is OK
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* for rdmavt to do this or not. This does not imply any functions of a
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* partiuclar IBTA object are overridden.
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*/
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#define RVT_FLAG_MR_INIT_DRIVER BIT(1)
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#define RVT_FLAG_QP_INIT_DRIVER BIT(2)
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#define RVT_FLAG_CQ_INIT_DRIVER BIT(3)
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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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/*
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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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u8 page_shift; /* 0 - non unform/non powerof2 sizes */
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u8 lkey_published; /* in global table */
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struct completion comp; /* complete when refcount goes to zero */
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atomic_t refcount;
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struct rvt_segarray *map[0]; /* 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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spinlock_t lock; /* protect changes in this struct */
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u32 next; /* next unused index (speeds search) */
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u32 gen; /* generation count */
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u32 max; /* size of the table */
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struct rvt_mregion __rcu **table;
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};
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/* End Memmory Region */
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/*
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* Things needed for the Queue Pair definition. Like the MR stuff above the
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* following should probably get moved to qp.h once drivers stop trying to make
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* and manipulate thier own QPs. For the few instnaces where a driver may need
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* to look into a queue pair there should be a pointer to a driver priavte data
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* structure that they can look at.
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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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/*
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* Send work request queue entry.
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* The size of the sg_list is determined when the QP is created and stored
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* in qp->s_max_sge.
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*/
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struct rvt_swqe {
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union {
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struct ib_send_wr wr; /* don't use wr.sg_list */
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struct ib_ud_wr ud_wr;
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struct ib_reg_wr reg_wr;
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struct ib_rdma_wr rdma_wr;
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struct ib_atomic_wr atomic_wr;
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};
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u32 psn; /* first packet sequence number */
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u32 lpsn; /* last packet sequence number */
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u32 ssn; /* send sequence number */
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u32 length; /* total length of data in sg_list */
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struct rvt_sge sg_list[0];
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};
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/*
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* Receive work request queue entry.
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* The size of the sg_list is determined when the QP (or SRQ) is created
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* and stored in qp->r_rq.max_sge (or srq->rq.max_sge).
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*/
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struct rvt_rwqe {
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u64 wr_id;
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u8 num_sge;
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struct ib_sge sg_list[0];
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};
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/*
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* This structure is used to contain the head pointer, tail pointer,
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* and receive work queue entries as a single memory allocation so
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* it can be mmap'ed into user space.
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* Note that the wq array elements are variable size so you can't
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* just index into the array to get the N'th element;
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* use get_rwqe_ptr() instead.
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*/
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struct rvt_rwq {
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u32 head; /* new work requests posted to the head */
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u32 tail; /* receives pull requests from here. */
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struct rvt_rwqe wq[0];
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};
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struct rvt_rq {
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struct rvt_rwq *wq;
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u32 size; /* size of RWQE array */
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u8 max_sge;
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/* protect changes in this struct */
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spinlock_t lock ____cacheline_aligned_in_smp;
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};
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/*
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* This structure is used by rvt_mmap() to validate an offset
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* when an mmap() request is made. The vm_area_struct then uses
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* this as its vm_private_data.
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*/
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struct rvt_mmap_info {
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struct list_head pending_mmaps;
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struct ib_ucontext *context;
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void *obj;
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__u64 offset;
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struct kref ref;
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unsigned size;
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};
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#define RVT_MAX_RDMA_ATOMIC 16
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/*
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* This structure holds the information that the send tasklet needs
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* to send a RDMA read response or atomic operation.
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*/
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struct rvt_ack_entry {
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u8 opcode;
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u8 sent;
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u32 psn;
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u32 lpsn;
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union {
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struct rvt_sge rdma_sge;
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u64 atomic_data;
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};
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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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/*
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* Variables prefixed with s_ are for the requester (sender).
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* Variables prefixed with r_ are for the responder (receiver).
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* Variables prefixed with ack_ are for responder replies.
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*
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* Common variables are protected by both r_rq.lock and s_lock in that order
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* which only happens in modify_qp() or changing the QP 'state'.
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*/
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struct rvt_qp {
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struct ib_qp ibqp;
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void *priv; /* Driver private data */
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/* read mostly fields above and below */
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struct ib_ah_attr remote_ah_attr;
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struct ib_ah_attr alt_ah_attr;
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struct rvt_qp __rcu *next; /* link list for QPN hash table */
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struct rvt_swqe *s_wq; /* send work queue */
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struct rvt_mmap_info *ip;
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unsigned long timeout_jiffies; /* computed from timeout */
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enum ib_mtu path_mtu;
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int srate_mbps; /* s_srate (below) converted to Mbit/s */
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u32 remote_qpn;
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u32 pmtu; /* decoded from path_mtu */
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u32 qkey; /* QKEY for this QP (for UD or RD) */
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u32 s_size; /* send work queue size */
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u32 s_rnr_timeout; /* number of milliseconds for RNR timeout */
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u32 s_ahgpsn; /* set to the psn in the copy of the header */
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u8 state; /* QP state */
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u8 allowed_ops; /* high order bits of allowed opcodes */
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u8 qp_access_flags;
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u8 alt_timeout; /* Alternate path timeout for this QP */
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u8 timeout; /* Timeout for this QP */
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u8 s_srate;
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u8 s_mig_state;
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u8 port_num;
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u8 s_pkey_index; /* PKEY index to use */
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u8 s_alt_pkey_index; /* Alternate path PKEY index to use */
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u8 r_max_rd_atomic; /* max number of RDMA read/atomic to receive */
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u8 s_max_rd_atomic; /* max number of RDMA read/atomic to send */
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u8 s_retry_cnt; /* number of times to retry */
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u8 s_rnr_retry_cnt;
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u8 r_min_rnr_timer; /* retry timeout value for RNR NAKs */
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u8 s_max_sge; /* size of s_wq->sg_list */
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u8 s_draining;
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/* start of read/write fields */
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atomic_t refcount ____cacheline_aligned_in_smp;
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wait_queue_head_t wait;
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struct rvt_ack_entry s_ack_queue[RVT_MAX_RDMA_ATOMIC + 1]
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____cacheline_aligned_in_smp;
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struct rvt_sge_state s_rdma_read_sge;
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spinlock_t r_lock ____cacheline_aligned_in_smp; /* used for APM */
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unsigned long r_aflags;
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u64 r_wr_id; /* ID for current receive WQE */
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u32 r_ack_psn; /* PSN for next ACK or atomic ACK */
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u32 r_len; /* total length of r_sge */
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u32 r_rcv_len; /* receive data len processed */
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u32 r_psn; /* expected rcv packet sequence number */
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u32 r_msn; /* message sequence number */
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u8 r_state; /* opcode of last packet received */
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u8 r_flags;
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u8 r_head_ack_queue; /* index into s_ack_queue[] */
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struct list_head rspwait; /* link for waiting to respond */
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struct rvt_sge_state r_sge; /* current receive data */
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struct rvt_rq r_rq; /* receive work queue */
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spinlock_t s_lock ____cacheline_aligned_in_smp;
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struct rvt_sge_state *s_cur_sge;
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u32 s_flags;
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struct rvt_swqe *s_wqe;
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struct rvt_sge_state s_sge; /* current send request data */
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struct rvt_mregion *s_rdma_mr;
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struct sdma_engine *s_sde; /* current sde */
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u32 s_cur_size; /* size of send packet in bytes */
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u32 s_len; /* total length of s_sge */
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u32 s_rdma_read_len; /* total length of s_rdma_read_sge */
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u32 s_next_psn; /* PSN for next request */
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u32 s_last_psn; /* last response PSN processed */
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u32 s_sending_psn; /* lowest PSN that is being sent */
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u32 s_sending_hpsn; /* highest PSN that is being sent */
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u32 s_psn; /* current packet sequence number */
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u32 s_ack_rdma_psn; /* PSN for sending RDMA read responses */
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u32 s_ack_psn; /* PSN for acking sends and RDMA writes */
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u32 s_head; /* new entries added here */
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u32 s_tail; /* next entry to process */
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u32 s_cur; /* current work queue entry */
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u32 s_acked; /* last un-ACK'ed entry */
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u32 s_last; /* last completed entry */
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u32 s_ssn; /* SSN of tail entry */
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u32 s_lsn; /* limit sequence number (credit) */
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u16 s_hdrwords; /* size of s_hdr in 32 bit words */
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u16 s_rdma_ack_cnt;
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s8 s_ahgidx;
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u8 s_state; /* opcode of last packet sent */
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u8 s_ack_state; /* opcode of packet to ACK */
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u8 s_nak_state; /* non-zero if NAK is pending */
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u8 r_nak_state; /* non-zero if NAK is pending */
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u8 s_retry; /* requester retry counter */
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u8 s_rnr_retry; /* requester RNR retry counter */
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u8 s_num_rd_atomic; /* number of RDMA read/atomic pending */
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u8 s_tail_ack_queue; /* index into s_ack_queue[] */
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struct rvt_sge_state s_ack_rdma_sge;
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struct timer_list s_timer;
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/*
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* This sge list MUST be last. Do not add anything below here.
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*/
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struct rvt_sge r_sg_list[0] /* verified SGEs */
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____cacheline_aligned_in_smp;
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};
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struct rvt_srq {
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struct ib_srq ibsrq;
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struct rvt_rq rq;
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struct rvt_mmap_info *ip;
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/* send signal when number of RWQEs < limit */
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u32 limit;
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};
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/* End QP section */
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/*
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* Things that are driver specific, module parameters in hfi1 and qib
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*/
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struct rvt_driver_params {
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/*
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* driver required fields:
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* node_guid
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* phys_port_cnt
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* dma_device
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* owner
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* driver optional fields (rvt will provide generic value if blank):
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* name
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* node_desc
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* rvt fields, driver value ignored:
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* uverbs_abi_ver
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* node_type
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* num_comp_vectors
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* uverbs_cmd_mask
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*/
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struct ib_device_attr props;
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/*
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* Drivers will need to support a number of notifications to rvt in
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* accordance with certain events. This structure should contain a mask
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* of the supported events. Such events that the rvt may need to know
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* about include:
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* port errors
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* port active
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* lid change
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* sm change
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* client reregister
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* pkey change
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*
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* There may also be other events that the rvt layers needs to know
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* about this is not an exhaustive list. Some events though rvt does not
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* need to rely on the driver for such as completion queue error.
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*/
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int rvt_signal_supported;
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/*
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* Anything driver specific that is not covered by props
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* For instance special module parameters. Goes here.
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*/
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unsigned int lkey_table_size;
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};
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/*
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* Functions that drivers are required to support
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*/
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struct rvt_dev_info;
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struct rvt_driver_provided {
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/*
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* The work to create port files in /sys/class Infiniband is different
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* depending on the driver. This should not be extracted away and
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* instead drivers are responsible for setting the correct callback for
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* this.
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*/
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int (*port_callback)(struct ib_device *, u8, struct kobject *);
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const char * (*get_card_name)(struct rvt_dev_info *rdi);
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struct pci_dev * (*get_pci_dev)(struct rvt_dev_info *rdi);
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int (*check_ah)(struct ib_device *, struct ib_ah_attr *);
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};
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/* Protection domain */
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struct rvt_pd {
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struct ib_pd ibpd;
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int user; /* non-zero if created from user space */
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};
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/* Address handle */
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struct rvt_ah {
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struct ib_ah ibah;
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struct ib_ah_attr attr;
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atomic_t refcount;
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};
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struct rvt_dev_info {
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struct ib_device ibdev; /* Keep this first. Nothing above here */
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/*
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* Prior to calling for registration the driver will be responsible for
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* allocating space for this structure.
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*
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* The driver will also be responsible for filling in certain members of
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* dparms.props
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*/
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/* Driver specific properties */
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struct rvt_driver_params dparms;
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struct rvt_mregion __rcu *dma_mr;
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struct rvt_lkey_table lkey_table;
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/* PKey Table goes here */
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/* Driver specific helper functions */
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struct rvt_driver_provided driver_f;
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/* Internal use */
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int n_pds_allocated;
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spinlock_t n_pds_lock; /* Protect pd allocated count */
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int n_ahs_allocated;
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spinlock_t n_ahs_lock; /* Protect ah allocated count */
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int flags;
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};
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static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd)
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{
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return container_of(ibpd, struct rvt_pd, ibpd);
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}
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static inline struct rvt_ah *ibah_to_rvtah(struct ib_ah *ibah)
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{
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return container_of(ibah, struct rvt_ah, ibah);
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}
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static inline struct rvt_dev_info *ib_to_rvt(struct ib_device *ibdev)
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{
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return container_of(ibdev, struct rvt_dev_info, ibdev);
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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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if (unlikely(atomic_dec_and_test(&mr->refcount)))
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complete(&mr->comp);
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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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atomic_inc(&mr->refcount);
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}
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static inline struct rvt_srq *ibsrq_to_rvtsrq(struct ib_srq *ibsrq)
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{
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return container_of(ibsrq, struct rvt_srq, ibsrq);
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}
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int rvt_register_device(struct rvt_dev_info *rvd);
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void rvt_unregister_device(struct rvt_dev_info *rvd);
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int rvt_check_ah(struct ib_device *ibdev, struct ib_ah_attr *ah_attr);
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int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
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u32 len, u64 vaddr, u32 rkey, int acc);
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int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
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struct rvt_sge *isge, struct ib_sge *sge, int acc);
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#endif /* DEF_RDMA_VT_H */
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