517 строки
17 KiB
C
517 строки
17 KiB
C
#ifndef DEF_RDMAVT_INCQP_H
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#define DEF_RDMAVT_INCQP_H
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/*
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* Copyright(c) 2016 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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#include <rdma/rdma_vt.h>
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#include <rdma/ib_pack.h>
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#include <rdma/ib_verbs.h>
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/*
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* Atomic bit definitions for r_aflags.
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*/
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#define RVT_R_WRID_VALID 0
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#define RVT_R_REWIND_SGE 1
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/*
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* Bit definitions for r_flags.
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*/
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#define RVT_R_REUSE_SGE 0x01
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#define RVT_R_RDMAR_SEQ 0x02
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#define RVT_R_RSP_NAK 0x04
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#define RVT_R_RSP_SEND 0x08
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#define RVT_R_COMM_EST 0x10
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/*
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* Bit definitions for s_flags.
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*
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* RVT_S_SIGNAL_REQ_WR - set if QP send WRs contain completion signaled
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* RVT_S_BUSY - send tasklet is processing the QP
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* RVT_S_TIMER - the RC retry timer is active
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* RVT_S_ACK_PENDING - an ACK is waiting to be sent after RDMA read/atomics
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* RVT_S_WAIT_FENCE - waiting for all prior RDMA read or atomic SWQEs
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* before processing the next SWQE
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* RVT_S_WAIT_RDMAR - waiting for a RDMA read or atomic SWQE to complete
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* before processing the next SWQE
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* RVT_S_WAIT_RNR - waiting for RNR timeout
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* RVT_S_WAIT_SSN_CREDIT - waiting for RC credits to process next SWQE
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* RVT_S_WAIT_DMA - waiting for send DMA queue to drain before generating
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* next send completion entry not via send DMA
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* RVT_S_WAIT_PIO - waiting for a send buffer to be available
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* RVT_S_WAIT_PIO_DRAIN - waiting for a qp to drain pio packets
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* RVT_S_WAIT_TX - waiting for a struct verbs_txreq to be available
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* RVT_S_WAIT_DMA_DESC - waiting for DMA descriptors to be available
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* RVT_S_WAIT_KMEM - waiting for kernel memory to be available
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* RVT_S_WAIT_PSN - waiting for a packet to exit the send DMA queue
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* RVT_S_WAIT_ACK - waiting for an ACK packet before sending more requests
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* RVT_S_SEND_ONE - send one packet, request ACK, then wait for ACK
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* RVT_S_ECN - a BECN was queued to the send engine
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*/
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#define RVT_S_SIGNAL_REQ_WR 0x0001
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#define RVT_S_BUSY 0x0002
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#define RVT_S_TIMER 0x0004
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#define RVT_S_RESP_PENDING 0x0008
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#define RVT_S_ACK_PENDING 0x0010
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#define RVT_S_WAIT_FENCE 0x0020
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#define RVT_S_WAIT_RDMAR 0x0040
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#define RVT_S_WAIT_RNR 0x0080
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#define RVT_S_WAIT_SSN_CREDIT 0x0100
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#define RVT_S_WAIT_DMA 0x0200
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#define RVT_S_WAIT_PIO 0x0400
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#define RVT_S_WAIT_PIO_DRAIN 0x0800
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#define RVT_S_WAIT_TX 0x1000
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#define RVT_S_WAIT_DMA_DESC 0x2000
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#define RVT_S_WAIT_KMEM 0x4000
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#define RVT_S_WAIT_PSN 0x8000
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#define RVT_S_WAIT_ACK 0x10000
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#define RVT_S_SEND_ONE 0x20000
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#define RVT_S_UNLIMITED_CREDIT 0x40000
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#define RVT_S_AHG_VALID 0x80000
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#define RVT_S_AHG_CLEAR 0x100000
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#define RVT_S_ECN 0x200000
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/*
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* Wait flags that would prevent any packet type from being sent.
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*/
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#define RVT_S_ANY_WAIT_IO \
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(RVT_S_WAIT_PIO | RVT_S_WAIT_PIO_DRAIN | RVT_S_WAIT_TX | \
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RVT_S_WAIT_DMA_DESC | RVT_S_WAIT_KMEM)
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/*
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* Wait flags that would prevent send work requests from making progress.
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*/
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#define RVT_S_ANY_WAIT_SEND (RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | \
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RVT_S_WAIT_RNR | RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_DMA | \
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RVT_S_WAIT_PSN | RVT_S_WAIT_ACK)
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#define RVT_S_ANY_WAIT (RVT_S_ANY_WAIT_IO | RVT_S_ANY_WAIT_SEND)
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/* Number of bits to pay attention to in the opcode for checking qp type */
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#define RVT_OPCODE_QP_MASK 0xE0
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/* Flags for checking QP state (see ib_rvt_state_ops[]) */
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#define RVT_POST_SEND_OK 0x01
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#define RVT_POST_RECV_OK 0x02
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#define RVT_PROCESS_RECV_OK 0x04
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#define RVT_PROCESS_SEND_OK 0x08
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#define RVT_PROCESS_NEXT_SEND_OK 0x10
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#define RVT_FLUSH_SEND 0x20
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#define RVT_FLUSH_RECV 0x40
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#define RVT_PROCESS_OR_FLUSH_SEND \
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(RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND)
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/*
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* Internal send flags
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*/
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#define RVT_SEND_RESERVE_USED IB_SEND_RESERVED_START
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#define RVT_SEND_COMPLETION_ONLY (IB_SEND_RESERVED_START << 1)
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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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/*
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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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struct rvt_sge rdma_sge;
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u64 atomic_data;
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u32 psn;
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u32 lpsn;
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u8 opcode;
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u8 sent;
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};
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#define RC_QP_SCALING_INTERVAL 5
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#define RVT_OPERATION_PRIV 0x00000001
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#define RVT_OPERATION_ATOMIC 0x00000002
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#define RVT_OPERATION_ATOMIC_SGE 0x00000004
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#define RVT_OPERATION_LOCAL 0x00000008
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#define RVT_OPERATION_USE_RESERVE 0x00000010
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#define RVT_OPERATION_MAX (IB_WR_RESERVED10 + 1)
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/**
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* rvt_operation_params - op table entry
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* @length - the length to copy into the swqe entry
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* @qpt_support - a bit mask indicating QP type support
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* @flags - RVT_OPERATION flags (see above)
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*
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* This supports table driven post send so that
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* the driver can have differing an potentially
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* different sets of operations.
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*
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**/
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struct rvt_operation_params {
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size_t length;
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u32 qpt_support;
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u32 flags;
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};
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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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pid_t pid; /* pid for user mode QPs */
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u32 remote_qpn;
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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_ahgpsn; /* set to the psn in the copy of the header */
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u16 pmtu; /* decoded from path_mtu */
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u8 log_pmtu; /* shift for pmtu */
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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;
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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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u32 r_psn; /* expected rcv packet sequence number */
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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_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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/* post send line */
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spinlock_t s_hlock ____cacheline_aligned_in_smp;
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u32 s_head; /* new entries added here */
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u32 s_next_psn; /* PSN for next request */
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u32 s_avail; /* number of entries avail */
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u32 s_ssn; /* SSN of tail entry */
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atomic_t s_reserved_used; /* reserved entries in use */
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spinlock_t s_lock ____cacheline_aligned_in_smp;
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u32 s_flags;
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struct rvt_sge_state *s_cur_sge;
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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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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_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_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_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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atomic_t local_ops_pending; /* number of fast_reg/local_inv reqs */
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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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#define RVT_QPN_MAX BIT(24)
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#define RVT_QPNMAP_ENTRIES (RVT_QPN_MAX / PAGE_SIZE / BITS_PER_BYTE)
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#define RVT_BITS_PER_PAGE (PAGE_SIZE * BITS_PER_BYTE)
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#define RVT_BITS_PER_PAGE_MASK (RVT_BITS_PER_PAGE - 1)
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#define RVT_QPN_MASK 0xFFFFFF
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/*
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* QPN-map pages start out as NULL, they get allocated upon
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* first use and are never deallocated. This way,
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* large bitmaps are not allocated unless large numbers of QPs are used.
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*/
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struct rvt_qpn_map {
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void *page;
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};
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struct rvt_qpn_table {
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spinlock_t lock; /* protect changes to the qp table */
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unsigned flags; /* flags for QP0/1 allocated for each port */
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u32 last; /* last QP number allocated */
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u32 nmaps; /* size of the map table */
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u16 limit;
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u8 incr;
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/* bit map of free QP numbers other than 0/1 */
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struct rvt_qpn_map map[RVT_QPNMAP_ENTRIES];
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};
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struct rvt_qp_ibdev {
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u32 qp_table_size;
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u32 qp_table_bits;
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struct rvt_qp __rcu **qp_table;
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spinlock_t qpt_lock; /* qptable lock */
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struct rvt_qpn_table qpn_table;
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};
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/*
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* There is one struct rvt_mcast for each multicast GID.
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* All attached QPs are then stored as a list of
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* struct rvt_mcast_qp.
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*/
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struct rvt_mcast_qp {
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struct list_head list;
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struct rvt_qp *qp;
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};
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struct rvt_mcast {
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struct rb_node rb_node;
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union ib_gid mgid;
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struct list_head qp_list;
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wait_queue_head_t wait;
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atomic_t refcount;
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int n_attached;
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};
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/*
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* Since struct rvt_swqe is not a fixed size, we can't simply index into
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* struct rvt_qp.s_wq. This function does the array index computation.
|
|
*/
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|
static inline struct rvt_swqe *rvt_get_swqe_ptr(struct rvt_qp *qp,
|
|
unsigned n)
|
|
{
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|
return (struct rvt_swqe *)((char *)qp->s_wq +
|
|
(sizeof(struct rvt_swqe) +
|
|
qp->s_max_sge *
|
|
sizeof(struct rvt_sge)) * n);
|
|
}
|
|
|
|
/*
|
|
* Since struct rvt_rwqe is not a fixed size, we can't simply index into
|
|
* struct rvt_rwq.wq. This function does the array index computation.
|
|
*/
|
|
static inline struct rvt_rwqe *rvt_get_rwqe_ptr(struct rvt_rq *rq, unsigned n)
|
|
{
|
|
return (struct rvt_rwqe *)
|
|
((char *)rq->wq->wq +
|
|
(sizeof(struct rvt_rwqe) +
|
|
rq->max_sge * sizeof(struct ib_sge)) * n);
|
|
}
|
|
|
|
/**
|
|
* rvt_qp_wqe_reserve - reserve operation
|
|
* @qp - the rvt qp
|
|
* @wqe - the send wqe
|
|
*
|
|
* This routine used in post send to record
|
|
* a wqe relative reserved operation use.
|
|
*/
|
|
static inline void rvt_qp_wqe_reserve(
|
|
struct rvt_qp *qp,
|
|
struct rvt_swqe *wqe)
|
|
{
|
|
wqe->wr.send_flags |= RVT_SEND_RESERVE_USED;
|
|
atomic_inc(&qp->s_reserved_used);
|
|
}
|
|
|
|
/**
|
|
* rvt_qp_wqe_unreserve - clean reserved operation
|
|
* @qp - the rvt qp
|
|
* @wqe - the send wqe
|
|
*
|
|
* This decrements the reserve use count.
|
|
*
|
|
* This call MUST precede the change to
|
|
* s_last to insure that post send sees a stable
|
|
* s_avail.
|
|
*
|
|
* An smp_mp__after_atomic() is used to insure
|
|
* the compiler does not juggle the order of the s_last
|
|
* ring index and the decrementing of s_reserved_used.
|
|
*/
|
|
static inline void rvt_qp_wqe_unreserve(
|
|
struct rvt_qp *qp,
|
|
struct rvt_swqe *wqe)
|
|
{
|
|
if (unlikely(wqe->wr.send_flags & RVT_SEND_RESERVE_USED)) {
|
|
wqe->wr.send_flags &= ~RVT_SEND_RESERVE_USED;
|
|
atomic_dec(&qp->s_reserved_used);
|
|
/* insure no compiler re-order up to s_last change */
|
|
smp_mb__after_atomic();
|
|
}
|
|
}
|
|
|
|
extern const int ib_rvt_state_ops[];
|
|
|
|
struct rvt_dev_info;
|
|
int rvt_error_qp(struct rvt_qp *qp, enum ib_wc_status err);
|
|
|
|
#endif /* DEF_RDMAVT_INCQP_H */
|