mirror of https://gitee.com/openkylin/linux.git
560 lines
14 KiB
C
560 lines
14 KiB
C
/*
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* Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
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* All rights reserved.
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* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "qib.h"
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/* cut down ridiculously long IB macro names */
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#define OP(x) IB_OPCODE_UC_##x
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/**
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* qib_make_uc_req - construct a request packet (SEND, RDMA write)
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* @qp: a pointer to the QP
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*
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* Return 1 if constructed; otherwise, return 0.
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*/
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int qib_make_uc_req(struct qib_qp *qp)
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{
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struct qib_other_headers *ohdr;
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struct qib_swqe *wqe;
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unsigned long flags;
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u32 hwords;
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u32 bth0;
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u32 len;
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u32 pmtu = qp->pmtu;
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int ret = 0;
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spin_lock_irqsave(&qp->s_lock, flags);
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if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_SEND_OK)) {
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if (!(ib_qib_state_ops[qp->state] & QIB_FLUSH_SEND))
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goto bail;
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/* We are in the error state, flush the work request. */
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if (qp->s_last == qp->s_head)
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goto bail;
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/* If DMAs are in progress, we can't flush immediately. */
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if (atomic_read(&qp->s_dma_busy)) {
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qp->s_flags |= QIB_S_WAIT_DMA;
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goto bail;
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}
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wqe = get_swqe_ptr(qp, qp->s_last);
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qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
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goto done;
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}
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ohdr = &qp->s_hdr.u.oth;
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if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
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ohdr = &qp->s_hdr.u.l.oth;
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/* header size in 32-bit words LRH+BTH = (8+12)/4. */
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hwords = 5;
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bth0 = 0;
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/* Get the next send request. */
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wqe = get_swqe_ptr(qp, qp->s_cur);
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qp->s_wqe = NULL;
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switch (qp->s_state) {
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default:
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if (!(ib_qib_state_ops[qp->state] &
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QIB_PROCESS_NEXT_SEND_OK))
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goto bail;
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/* Check if send work queue is empty. */
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if (qp->s_cur == qp->s_head)
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goto bail;
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/*
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* Start a new request.
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*/
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wqe->psn = qp->s_next_psn;
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qp->s_psn = qp->s_next_psn;
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qp->s_sge.sge = wqe->sg_list[0];
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qp->s_sge.sg_list = wqe->sg_list + 1;
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qp->s_sge.num_sge = wqe->wr.num_sge;
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qp->s_sge.total_len = wqe->length;
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len = wqe->length;
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qp->s_len = len;
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switch (wqe->wr.opcode) {
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case IB_WR_SEND:
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case IB_WR_SEND_WITH_IMM:
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if (len > pmtu) {
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qp->s_state = OP(SEND_FIRST);
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len = pmtu;
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break;
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}
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if (wqe->wr.opcode == IB_WR_SEND)
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qp->s_state = OP(SEND_ONLY);
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else {
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qp->s_state =
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OP(SEND_ONLY_WITH_IMMEDIATE);
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/* Immediate data comes after the BTH */
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ohdr->u.imm_data = wqe->wr.ex.imm_data;
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hwords += 1;
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}
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if (wqe->wr.send_flags & IB_SEND_SOLICITED)
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bth0 |= IB_BTH_SOLICITED;
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qp->s_wqe = wqe;
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if (++qp->s_cur >= qp->s_size)
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qp->s_cur = 0;
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break;
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case IB_WR_RDMA_WRITE:
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case IB_WR_RDMA_WRITE_WITH_IMM:
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ohdr->u.rc.reth.vaddr =
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cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
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ohdr->u.rc.reth.rkey =
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cpu_to_be32(wqe->wr.wr.rdma.rkey);
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ohdr->u.rc.reth.length = cpu_to_be32(len);
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hwords += sizeof(struct ib_reth) / 4;
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if (len > pmtu) {
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qp->s_state = OP(RDMA_WRITE_FIRST);
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len = pmtu;
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break;
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}
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if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
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qp->s_state = OP(RDMA_WRITE_ONLY);
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else {
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qp->s_state =
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OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
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/* Immediate data comes after the RETH */
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ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
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hwords += 1;
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if (wqe->wr.send_flags & IB_SEND_SOLICITED)
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bth0 |= IB_BTH_SOLICITED;
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}
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qp->s_wqe = wqe;
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if (++qp->s_cur >= qp->s_size)
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qp->s_cur = 0;
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break;
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default:
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goto bail;
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}
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break;
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case OP(SEND_FIRST):
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qp->s_state = OP(SEND_MIDDLE);
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/* FALLTHROUGH */
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case OP(SEND_MIDDLE):
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len = qp->s_len;
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if (len > pmtu) {
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len = pmtu;
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break;
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}
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if (wqe->wr.opcode == IB_WR_SEND)
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qp->s_state = OP(SEND_LAST);
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else {
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qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
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/* Immediate data comes after the BTH */
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ohdr->u.imm_data = wqe->wr.ex.imm_data;
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hwords += 1;
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}
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if (wqe->wr.send_flags & IB_SEND_SOLICITED)
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bth0 |= IB_BTH_SOLICITED;
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qp->s_wqe = wqe;
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if (++qp->s_cur >= qp->s_size)
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qp->s_cur = 0;
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break;
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case OP(RDMA_WRITE_FIRST):
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qp->s_state = OP(RDMA_WRITE_MIDDLE);
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/* FALLTHROUGH */
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case OP(RDMA_WRITE_MIDDLE):
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len = qp->s_len;
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if (len > pmtu) {
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len = pmtu;
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break;
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}
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if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
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qp->s_state = OP(RDMA_WRITE_LAST);
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else {
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qp->s_state =
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OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
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/* Immediate data comes after the BTH */
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ohdr->u.imm_data = wqe->wr.ex.imm_data;
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hwords += 1;
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if (wqe->wr.send_flags & IB_SEND_SOLICITED)
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bth0 |= IB_BTH_SOLICITED;
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}
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qp->s_wqe = wqe;
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if (++qp->s_cur >= qp->s_size)
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qp->s_cur = 0;
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break;
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}
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qp->s_len -= len;
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qp->s_hdrwords = hwords;
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qp->s_cur_sge = &qp->s_sge;
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qp->s_cur_size = len;
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qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
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qp->s_next_psn++ & QIB_PSN_MASK);
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done:
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ret = 1;
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goto unlock;
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bail:
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qp->s_flags &= ~QIB_S_BUSY;
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unlock:
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spin_unlock_irqrestore(&qp->s_lock, flags);
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return ret;
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}
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/**
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* qib_uc_rcv - handle an incoming UC packet
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* @ibp: the port the packet came in on
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* @hdr: the header of the packet
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* @has_grh: true if the packet has a GRH
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* @data: the packet data
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* @tlen: the length of the packet
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* @qp: the QP for this packet.
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*
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* This is called from qib_qp_rcv() to process an incoming UC packet
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* for the given QP.
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* Called at interrupt level.
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*/
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void qib_uc_rcv(struct qib_ibport *ibp, struct qib_ib_header *hdr,
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int has_grh, void *data, u32 tlen, struct qib_qp *qp)
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{
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struct qib_other_headers *ohdr;
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unsigned long flags;
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u32 opcode;
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u32 hdrsize;
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u32 psn;
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u32 pad;
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struct ib_wc wc;
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u32 pmtu = qp->pmtu;
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struct ib_reth *reth;
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int ret;
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/* Check for GRH */
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if (!has_grh) {
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ohdr = &hdr->u.oth;
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hdrsize = 8 + 12; /* LRH + BTH */
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} else {
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ohdr = &hdr->u.l.oth;
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hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */
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}
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opcode = be32_to_cpu(ohdr->bth[0]);
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spin_lock_irqsave(&qp->s_lock, flags);
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if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
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goto sunlock;
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spin_unlock_irqrestore(&qp->s_lock, flags);
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psn = be32_to_cpu(ohdr->bth[2]);
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opcode >>= 24;
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/* Compare the PSN verses the expected PSN. */
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if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) {
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/*
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* Handle a sequence error.
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* Silently drop any current message.
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*/
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qp->r_psn = psn;
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inv:
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if (qp->r_state == OP(SEND_FIRST) ||
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qp->r_state == OP(SEND_MIDDLE)) {
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set_bit(QIB_R_REWIND_SGE, &qp->r_aflags);
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qp->r_sge.num_sge = 0;
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} else
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while (qp->r_sge.num_sge) {
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atomic_dec(&qp->r_sge.sge.mr->refcount);
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if (--qp->r_sge.num_sge)
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qp->r_sge.sge = *qp->r_sge.sg_list++;
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}
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qp->r_state = OP(SEND_LAST);
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switch (opcode) {
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case OP(SEND_FIRST):
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case OP(SEND_ONLY):
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case OP(SEND_ONLY_WITH_IMMEDIATE):
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goto send_first;
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case OP(RDMA_WRITE_FIRST):
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case OP(RDMA_WRITE_ONLY):
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case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
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goto rdma_first;
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default:
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goto drop;
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}
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}
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/* Check for opcode sequence errors. */
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switch (qp->r_state) {
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case OP(SEND_FIRST):
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case OP(SEND_MIDDLE):
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if (opcode == OP(SEND_MIDDLE) ||
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opcode == OP(SEND_LAST) ||
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opcode == OP(SEND_LAST_WITH_IMMEDIATE))
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break;
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goto inv;
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case OP(RDMA_WRITE_FIRST):
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case OP(RDMA_WRITE_MIDDLE):
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if (opcode == OP(RDMA_WRITE_MIDDLE) ||
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opcode == OP(RDMA_WRITE_LAST) ||
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opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
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break;
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goto inv;
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default:
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if (opcode == OP(SEND_FIRST) ||
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opcode == OP(SEND_ONLY) ||
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opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
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opcode == OP(RDMA_WRITE_FIRST) ||
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opcode == OP(RDMA_WRITE_ONLY) ||
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opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
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break;
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goto inv;
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}
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if (qp->state == IB_QPS_RTR && !(qp->r_flags & QIB_R_COMM_EST)) {
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qp->r_flags |= QIB_R_COMM_EST;
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if (qp->ibqp.event_handler) {
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struct ib_event ev;
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ev.device = qp->ibqp.device;
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ev.element.qp = &qp->ibqp;
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ev.event = IB_EVENT_COMM_EST;
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qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
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}
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}
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/* OK, process the packet. */
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switch (opcode) {
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case OP(SEND_FIRST):
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case OP(SEND_ONLY):
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case OP(SEND_ONLY_WITH_IMMEDIATE):
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send_first:
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if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags))
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qp->r_sge = qp->s_rdma_read_sge;
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else {
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ret = qib_get_rwqe(qp, 0);
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if (ret < 0)
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goto op_err;
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if (!ret)
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goto drop;
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/*
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* qp->s_rdma_read_sge will be the owner
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* of the mr references.
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*/
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qp->s_rdma_read_sge = qp->r_sge;
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}
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qp->r_rcv_len = 0;
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if (opcode == OP(SEND_ONLY))
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goto no_immediate_data;
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else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
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goto send_last_imm;
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/* FALLTHROUGH */
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case OP(SEND_MIDDLE):
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/* Check for invalid length PMTU or posted rwqe len. */
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if (unlikely(tlen != (hdrsize + pmtu + 4)))
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goto rewind;
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qp->r_rcv_len += pmtu;
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if (unlikely(qp->r_rcv_len > qp->r_len))
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goto rewind;
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qib_copy_sge(&qp->r_sge, data, pmtu, 0);
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break;
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case OP(SEND_LAST_WITH_IMMEDIATE):
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send_last_imm:
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wc.ex.imm_data = ohdr->u.imm_data;
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hdrsize += 4;
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wc.wc_flags = IB_WC_WITH_IMM;
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goto send_last;
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case OP(SEND_LAST):
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no_immediate_data:
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wc.ex.imm_data = 0;
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wc.wc_flags = 0;
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send_last:
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/* Get the number of bytes the message was padded by. */
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pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
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/* Check for invalid length. */
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/* XXX LAST len should be >= 1 */
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if (unlikely(tlen < (hdrsize + pad + 4)))
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goto rewind;
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/* Don't count the CRC. */
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tlen -= (hdrsize + pad + 4);
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wc.byte_len = tlen + qp->r_rcv_len;
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if (unlikely(wc.byte_len > qp->r_len))
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goto rewind;
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wc.opcode = IB_WC_RECV;
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last_imm:
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qib_copy_sge(&qp->r_sge, data, tlen, 0);
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while (qp->s_rdma_read_sge.num_sge) {
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atomic_dec(&qp->s_rdma_read_sge.sge.mr->refcount);
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if (--qp->s_rdma_read_sge.num_sge)
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qp->s_rdma_read_sge.sge =
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*qp->s_rdma_read_sge.sg_list++;
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}
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wc.wr_id = qp->r_wr_id;
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wc.status = IB_WC_SUCCESS;
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wc.qp = &qp->ibqp;
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wc.src_qp = qp->remote_qpn;
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wc.slid = qp->remote_ah_attr.dlid;
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wc.sl = qp->remote_ah_attr.sl;
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/* zero fields that are N/A */
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wc.vendor_err = 0;
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wc.pkey_index = 0;
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wc.dlid_path_bits = 0;
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wc.port_num = 0;
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wc.csum_ok = 0;
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/* Signal completion event if the solicited bit is set. */
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qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
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(ohdr->bth[0] &
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cpu_to_be32(IB_BTH_SOLICITED)) != 0);
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break;
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case OP(RDMA_WRITE_FIRST):
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case OP(RDMA_WRITE_ONLY):
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case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
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rdma_first:
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if (unlikely(!(qp->qp_access_flags &
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IB_ACCESS_REMOTE_WRITE))) {
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goto drop;
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}
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reth = &ohdr->u.rc.reth;
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hdrsize += sizeof(*reth);
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qp->r_len = be32_to_cpu(reth->length);
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qp->r_rcv_len = 0;
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qp->r_sge.sg_list = NULL;
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if (qp->r_len != 0) {
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u32 rkey = be32_to_cpu(reth->rkey);
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u64 vaddr = be64_to_cpu(reth->vaddr);
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int ok;
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/* Check rkey */
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ok = qib_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
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vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
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if (unlikely(!ok))
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goto drop;
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qp->r_sge.num_sge = 1;
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} else {
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qp->r_sge.num_sge = 0;
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qp->r_sge.sge.mr = NULL;
|
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qp->r_sge.sge.vaddr = NULL;
|
|
qp->r_sge.sge.length = 0;
|
|
qp->r_sge.sge.sge_length = 0;
|
|
}
|
|
if (opcode == OP(RDMA_WRITE_ONLY))
|
|
goto rdma_last;
|
|
else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
|
|
wc.ex.imm_data = ohdr->u.rc.imm_data;
|
|
goto rdma_last_imm;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case OP(RDMA_WRITE_MIDDLE):
|
|
/* Check for invalid length PMTU or posted rwqe len. */
|
|
if (unlikely(tlen != (hdrsize + pmtu + 4)))
|
|
goto drop;
|
|
qp->r_rcv_len += pmtu;
|
|
if (unlikely(qp->r_rcv_len > qp->r_len))
|
|
goto drop;
|
|
qib_copy_sge(&qp->r_sge, data, pmtu, 1);
|
|
break;
|
|
|
|
case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
|
|
wc.ex.imm_data = ohdr->u.imm_data;
|
|
rdma_last_imm:
|
|
hdrsize += 4;
|
|
wc.wc_flags = IB_WC_WITH_IMM;
|
|
|
|
/* Get the number of bytes the message was padded by. */
|
|
pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
|
|
/* Check for invalid length. */
|
|
/* XXX LAST len should be >= 1 */
|
|
if (unlikely(tlen < (hdrsize + pad + 4)))
|
|
goto drop;
|
|
/* Don't count the CRC. */
|
|
tlen -= (hdrsize + pad + 4);
|
|
if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
|
|
goto drop;
|
|
if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags))
|
|
while (qp->s_rdma_read_sge.num_sge) {
|
|
atomic_dec(&qp->s_rdma_read_sge.sge.mr->
|
|
refcount);
|
|
if (--qp->s_rdma_read_sge.num_sge)
|
|
qp->s_rdma_read_sge.sge =
|
|
*qp->s_rdma_read_sge.sg_list++;
|
|
}
|
|
else {
|
|
ret = qib_get_rwqe(qp, 1);
|
|
if (ret < 0)
|
|
goto op_err;
|
|
if (!ret)
|
|
goto drop;
|
|
}
|
|
wc.byte_len = qp->r_len;
|
|
wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
|
|
goto last_imm;
|
|
|
|
case OP(RDMA_WRITE_LAST):
|
|
rdma_last:
|
|
/* Get the number of bytes the message was padded by. */
|
|
pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
|
|
/* Check for invalid length. */
|
|
/* XXX LAST len should be >= 1 */
|
|
if (unlikely(tlen < (hdrsize + pad + 4)))
|
|
goto drop;
|
|
/* Don't count the CRC. */
|
|
tlen -= (hdrsize + pad + 4);
|
|
if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
|
|
goto drop;
|
|
qib_copy_sge(&qp->r_sge, data, tlen, 1);
|
|
while (qp->r_sge.num_sge) {
|
|
atomic_dec(&qp->r_sge.sge.mr->refcount);
|
|
if (--qp->r_sge.num_sge)
|
|
qp->r_sge.sge = *qp->r_sge.sg_list++;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
/* Drop packet for unknown opcodes. */
|
|
goto drop;
|
|
}
|
|
qp->r_psn++;
|
|
qp->r_state = opcode;
|
|
return;
|
|
|
|
rewind:
|
|
set_bit(QIB_R_REWIND_SGE, &qp->r_aflags);
|
|
qp->r_sge.num_sge = 0;
|
|
drop:
|
|
ibp->n_pkt_drops++;
|
|
return;
|
|
|
|
op_err:
|
|
qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
|
|
return;
|
|
|
|
sunlock:
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
}
|