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24d02e0494
Fixes the following W=1 kernel build warning(s): drivers/infiniband/hw/qib/qib_rc.c:216: warning: Function parameter or member 'flags' not described in 'qib_make_rc_req' drivers/infiniband/hw/qib/qib_rc.c:1008: warning: Function parameter or member 'aeth' not described in 'do_rc_ack' drivers/infiniband/hw/qib/qib_rc.c:1008: warning: Function parameter or member 'val' not described in 'do_rc_ack' drivers/infiniband/hw/qib/qib_rc.c:1008: warning: Function parameter or member 'rcd' not described in 'do_rc_ack' drivers/infiniband/hw/qib/qib_rc.c:1274: warning: Function parameter or member 'rcd' not described in 'qib_rc_rcv_resp' drivers/infiniband/hw/qib/qib_rc.c:1497: warning: Function parameter or member 'rcd' not described in 'qib_rc_rcv_error' Link: https://lore.kernel.org/r/20210121094519.2044049-15-lee.jones@linaro.org Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com> Cc: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com> Cc: Doug Ledford <dledford@redhat.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: linux-rdma@vger.kernel.org Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
2132 lines
57 KiB
C
2132 lines
57 KiB
C
/*
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* Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. 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 <linux/io.h>
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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_RC_##x
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static u32 restart_sge(struct rvt_sge_state *ss, struct rvt_swqe *wqe,
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u32 psn, u32 pmtu)
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{
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u32 len;
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len = ((psn - wqe->psn) & QIB_PSN_MASK) * pmtu;
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return rvt_restart_sge(ss, wqe, len);
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}
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/**
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* qib_make_rc_ack - construct a response packet (ACK, NAK, or RDMA read)
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* @dev: the device for this QP
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* @qp: a pointer to the QP
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* @ohdr: a pointer to the IB header being constructed
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* @pmtu: the path MTU
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*
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* Return 1 if constructed; otherwise, return 0.
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* Note that we are in the responder's side of the QP context.
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* Note the QP s_lock must be held.
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*/
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static int qib_make_rc_ack(struct qib_ibdev *dev, struct rvt_qp *qp,
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struct ib_other_headers *ohdr, u32 pmtu)
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{
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struct rvt_ack_entry *e;
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u32 hwords;
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u32 len;
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u32 bth0;
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u32 bth2;
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/* Don't send an ACK if we aren't supposed to. */
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if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK))
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goto bail;
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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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switch (qp->s_ack_state) {
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case OP(RDMA_READ_RESPONSE_LAST):
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case OP(RDMA_READ_RESPONSE_ONLY):
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e = &qp->s_ack_queue[qp->s_tail_ack_queue];
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if (e->rdma_sge.mr) {
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rvt_put_mr(e->rdma_sge.mr);
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e->rdma_sge.mr = NULL;
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}
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fallthrough;
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case OP(ATOMIC_ACKNOWLEDGE):
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/*
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* We can increment the tail pointer now that the last
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* response has been sent instead of only being
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* constructed.
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*/
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if (++qp->s_tail_ack_queue > QIB_MAX_RDMA_ATOMIC)
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qp->s_tail_ack_queue = 0;
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fallthrough;
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case OP(SEND_ONLY):
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case OP(ACKNOWLEDGE):
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/* Check for no next entry in the queue. */
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if (qp->r_head_ack_queue == qp->s_tail_ack_queue) {
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if (qp->s_flags & RVT_S_ACK_PENDING)
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goto normal;
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goto bail;
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}
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e = &qp->s_ack_queue[qp->s_tail_ack_queue];
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if (e->opcode == OP(RDMA_READ_REQUEST)) {
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/*
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* If a RDMA read response is being resent and
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* we haven't seen the duplicate request yet,
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* then stop sending the remaining responses the
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* responder has seen until the requester resends it.
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*/
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len = e->rdma_sge.sge_length;
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if (len && !e->rdma_sge.mr) {
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qp->s_tail_ack_queue = qp->r_head_ack_queue;
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goto bail;
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}
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/* Copy SGE state in case we need to resend */
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qp->s_rdma_mr = e->rdma_sge.mr;
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if (qp->s_rdma_mr)
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rvt_get_mr(qp->s_rdma_mr);
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qp->s_ack_rdma_sge.sge = e->rdma_sge;
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qp->s_ack_rdma_sge.num_sge = 1;
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qp->s_cur_sge = &qp->s_ack_rdma_sge;
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if (len > pmtu) {
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len = pmtu;
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qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST);
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} else {
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qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY);
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e->sent = 1;
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}
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ohdr->u.aeth = rvt_compute_aeth(qp);
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hwords++;
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qp->s_ack_rdma_psn = e->psn;
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bth2 = qp->s_ack_rdma_psn++ & QIB_PSN_MASK;
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} else {
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/* COMPARE_SWAP or FETCH_ADD */
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qp->s_cur_sge = NULL;
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len = 0;
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qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE);
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ohdr->u.at.aeth = rvt_compute_aeth(qp);
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ib_u64_put(e->atomic_data, &ohdr->u.at.atomic_ack_eth);
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hwords += sizeof(ohdr->u.at) / sizeof(u32);
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bth2 = e->psn & QIB_PSN_MASK;
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e->sent = 1;
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}
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bth0 = qp->s_ack_state << 24;
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break;
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case OP(RDMA_READ_RESPONSE_FIRST):
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qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE);
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fallthrough;
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case OP(RDMA_READ_RESPONSE_MIDDLE):
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qp->s_cur_sge = &qp->s_ack_rdma_sge;
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qp->s_rdma_mr = qp->s_ack_rdma_sge.sge.mr;
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if (qp->s_rdma_mr)
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rvt_get_mr(qp->s_rdma_mr);
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len = qp->s_ack_rdma_sge.sge.sge_length;
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if (len > pmtu)
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len = pmtu;
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else {
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ohdr->u.aeth = rvt_compute_aeth(qp);
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hwords++;
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qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
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e = &qp->s_ack_queue[qp->s_tail_ack_queue];
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e->sent = 1;
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}
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bth0 = qp->s_ack_state << 24;
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bth2 = qp->s_ack_rdma_psn++ & QIB_PSN_MASK;
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break;
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default:
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normal:
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/*
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* Send a regular ACK.
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* Set the s_ack_state so we wait until after sending
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* the ACK before setting s_ack_state to ACKNOWLEDGE
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* (see above).
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*/
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qp->s_ack_state = OP(SEND_ONLY);
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qp->s_flags &= ~RVT_S_ACK_PENDING;
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qp->s_cur_sge = NULL;
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if (qp->s_nak_state)
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ohdr->u.aeth =
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cpu_to_be32((qp->r_msn & IB_MSN_MASK) |
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(qp->s_nak_state <<
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IB_AETH_CREDIT_SHIFT));
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else
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ohdr->u.aeth = rvt_compute_aeth(qp);
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hwords++;
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len = 0;
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bth0 = OP(ACKNOWLEDGE) << 24;
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bth2 = qp->s_ack_psn & QIB_PSN_MASK;
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}
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qp->s_rdma_ack_cnt++;
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qp->s_hdrwords = hwords;
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qp->s_cur_size = len;
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qib_make_ruc_header(qp, ohdr, bth0, bth2);
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return 1;
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bail:
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qp->s_ack_state = OP(ACKNOWLEDGE);
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qp->s_flags &= ~(RVT_S_RESP_PENDING | RVT_S_ACK_PENDING);
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return 0;
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}
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/**
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* qib_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC)
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* @qp: a pointer to the QP
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* @flags: unused
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*
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* Assumes the s_lock is held.
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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_rc_req(struct rvt_qp *qp, unsigned long *flags)
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{
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struct qib_qp_priv *priv = qp->priv;
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struct qib_ibdev *dev = to_idev(qp->ibqp.device);
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struct ib_other_headers *ohdr;
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struct rvt_sge_state *ss;
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struct rvt_swqe *wqe;
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u32 hwords;
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u32 len;
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u32 bth0;
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u32 bth2;
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u32 pmtu = qp->pmtu;
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char newreq;
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int ret = 0;
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int delta;
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ohdr = &priv->s_hdr->u.oth;
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if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
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ohdr = &priv->s_hdr->u.l.oth;
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/* Sending responses has higher priority over sending requests. */
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if ((qp->s_flags & RVT_S_RESP_PENDING) &&
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qib_make_rc_ack(dev, qp, ohdr, pmtu))
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goto done;
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if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
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if (!(ib_rvt_state_ops[qp->state] & RVT_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 == READ_ONCE(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(&priv->s_dma_busy)) {
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qp->s_flags |= RVT_S_WAIT_DMA;
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goto bail;
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}
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wqe = rvt_get_swqe_ptr(qp, qp->s_last);
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rvt_send_complete(qp, wqe, qp->s_last != qp->s_acked ?
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IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR);
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/* will get called again */
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goto done;
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}
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if (qp->s_flags & (RVT_S_WAIT_RNR | RVT_S_WAIT_ACK))
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goto bail;
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if (qib_cmp24(qp->s_psn, qp->s_sending_hpsn) <= 0) {
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if (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) {
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qp->s_flags |= RVT_S_WAIT_PSN;
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goto bail;
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}
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qp->s_sending_psn = qp->s_psn;
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qp->s_sending_hpsn = qp->s_psn - 1;
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}
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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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/* Send a request. */
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wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
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switch (qp->s_state) {
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default:
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if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK))
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goto bail;
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/*
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* Resend an old request or start a new one.
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*
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* We keep track of the current SWQE so that
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* we don't reset the "furthest progress" state
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* if we need to back up.
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*/
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newreq = 0;
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if (qp->s_cur == qp->s_tail) {
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/* Check if send work queue is empty. */
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if (qp->s_tail == READ_ONCE(qp->s_head))
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goto bail;
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/*
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* If a fence is requested, wait for previous
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* RDMA read and atomic operations to finish.
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*/
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if ((wqe->wr.send_flags & IB_SEND_FENCE) &&
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qp->s_num_rd_atomic) {
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qp->s_flags |= RVT_S_WAIT_FENCE;
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goto bail;
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}
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newreq = 1;
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qp->s_psn = wqe->psn;
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}
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/*
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* Note that we have to be careful not to modify the
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* original work request since we may need to resend
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* it.
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*/
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len = wqe->length;
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ss = &qp->s_sge;
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bth2 = qp->s_psn & QIB_PSN_MASK;
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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 no credit, return. */
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if (!rvt_rc_credit_avail(qp, wqe))
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goto bail;
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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 = 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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bth2 |= IB_BTH_REQ_ACK;
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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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if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
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qp->s_lsn++;
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goto no_flow_control;
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case IB_WR_RDMA_WRITE_WITH_IMM:
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/* If no credit, return. */
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if (!rvt_rc_credit_avail(qp, wqe))
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goto bail;
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no_flow_control:
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ohdr->u.rc.reth.vaddr =
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cpu_to_be64(wqe->rdma_wr.remote_addr);
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ohdr->u.rc.reth.rkey =
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cpu_to_be32(wqe->rdma_wr.rkey);
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ohdr->u.rc.reth.length = cpu_to_be32(len);
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hwords += sizeof(struct ib_reth) / sizeof(u32);
|
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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->rdma_wr.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 = OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
|
|
/* Immediate data comes after RETH */
|
|
ohdr->u.rc.imm_data =
|
|
wqe->rdma_wr.wr.ex.imm_data;
|
|
hwords += 1;
|
|
if (wqe->rdma_wr.wr.send_flags & IB_SEND_SOLICITED)
|
|
bth0 |= IB_BTH_SOLICITED;
|
|
}
|
|
bth2 |= IB_BTH_REQ_ACK;
|
|
if (++qp->s_cur == qp->s_size)
|
|
qp->s_cur = 0;
|
|
break;
|
|
|
|
case IB_WR_RDMA_READ:
|
|
/*
|
|
* Don't allow more operations to be started
|
|
* than the QP limits allow.
|
|
*/
|
|
if (newreq) {
|
|
if (qp->s_num_rd_atomic >=
|
|
qp->s_max_rd_atomic) {
|
|
qp->s_flags |= RVT_S_WAIT_RDMAR;
|
|
goto bail;
|
|
}
|
|
qp->s_num_rd_atomic++;
|
|
if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
|
|
qp->s_lsn++;
|
|
}
|
|
|
|
ohdr->u.rc.reth.vaddr =
|
|
cpu_to_be64(wqe->rdma_wr.remote_addr);
|
|
ohdr->u.rc.reth.rkey =
|
|
cpu_to_be32(wqe->rdma_wr.rkey);
|
|
ohdr->u.rc.reth.length = cpu_to_be32(len);
|
|
qp->s_state = OP(RDMA_READ_REQUEST);
|
|
hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
|
|
ss = NULL;
|
|
len = 0;
|
|
bth2 |= IB_BTH_REQ_ACK;
|
|
if (++qp->s_cur == qp->s_size)
|
|
qp->s_cur = 0;
|
|
break;
|
|
|
|
case IB_WR_ATOMIC_CMP_AND_SWP:
|
|
case IB_WR_ATOMIC_FETCH_AND_ADD:
|
|
/*
|
|
* Don't allow more operations to be started
|
|
* than the QP limits allow.
|
|
*/
|
|
if (newreq) {
|
|
if (qp->s_num_rd_atomic >=
|
|
qp->s_max_rd_atomic) {
|
|
qp->s_flags |= RVT_S_WAIT_RDMAR;
|
|
goto bail;
|
|
}
|
|
qp->s_num_rd_atomic++;
|
|
if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
|
|
qp->s_lsn++;
|
|
}
|
|
if (wqe->atomic_wr.wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
|
|
qp->s_state = OP(COMPARE_SWAP);
|
|
put_ib_ateth_swap(wqe->atomic_wr.swap,
|
|
&ohdr->u.atomic_eth);
|
|
put_ib_ateth_compare(wqe->atomic_wr.compare_add,
|
|
&ohdr->u.atomic_eth);
|
|
} else {
|
|
qp->s_state = OP(FETCH_ADD);
|
|
put_ib_ateth_swap(wqe->atomic_wr.compare_add,
|
|
&ohdr->u.atomic_eth);
|
|
put_ib_ateth_compare(0, &ohdr->u.atomic_eth);
|
|
}
|
|
put_ib_ateth_vaddr(wqe->atomic_wr.remote_addr,
|
|
&ohdr->u.atomic_eth);
|
|
ohdr->u.atomic_eth.rkey = cpu_to_be32(
|
|
wqe->atomic_wr.rkey);
|
|
hwords += sizeof(struct ib_atomic_eth) / sizeof(u32);
|
|
ss = NULL;
|
|
len = 0;
|
|
bth2 |= IB_BTH_REQ_ACK;
|
|
if (++qp->s_cur == qp->s_size)
|
|
qp->s_cur = 0;
|
|
break;
|
|
|
|
default:
|
|
goto bail;
|
|
}
|
|
qp->s_sge.sge = wqe->sg_list[0];
|
|
qp->s_sge.sg_list = wqe->sg_list + 1;
|
|
qp->s_sge.num_sge = wqe->wr.num_sge;
|
|
qp->s_sge.total_len = wqe->length;
|
|
qp->s_len = wqe->length;
|
|
if (newreq) {
|
|
qp->s_tail++;
|
|
if (qp->s_tail >= qp->s_size)
|
|
qp->s_tail = 0;
|
|
}
|
|
if (wqe->wr.opcode == IB_WR_RDMA_READ)
|
|
qp->s_psn = wqe->lpsn + 1;
|
|
else
|
|
qp->s_psn++;
|
|
break;
|
|
|
|
case OP(RDMA_READ_RESPONSE_FIRST):
|
|
/*
|
|
* qp->s_state is normally set to the opcode of the
|
|
* last packet constructed for new requests and therefore
|
|
* is never set to RDMA read response.
|
|
* RDMA_READ_RESPONSE_FIRST is used by the ACK processing
|
|
* thread to indicate a SEND needs to be restarted from an
|
|
* earlier PSN without interferring with the sending thread.
|
|
* See qib_restart_rc().
|
|
*/
|
|
qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
|
|
fallthrough;
|
|
case OP(SEND_FIRST):
|
|
qp->s_state = OP(SEND_MIDDLE);
|
|
fallthrough;
|
|
case OP(SEND_MIDDLE):
|
|
bth2 = qp->s_psn++ & QIB_PSN_MASK;
|
|
ss = &qp->s_sge;
|
|
len = qp->s_len;
|
|
if (len > pmtu) {
|
|
len = pmtu;
|
|
break;
|
|
}
|
|
if (wqe->wr.opcode == IB_WR_SEND)
|
|
qp->s_state = OP(SEND_LAST);
|
|
else {
|
|
qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
|
|
/* Immediate data comes after the BTH */
|
|
ohdr->u.imm_data = wqe->wr.ex.imm_data;
|
|
hwords += 1;
|
|
}
|
|
if (wqe->wr.send_flags & IB_SEND_SOLICITED)
|
|
bth0 |= IB_BTH_SOLICITED;
|
|
bth2 |= IB_BTH_REQ_ACK;
|
|
qp->s_cur++;
|
|
if (qp->s_cur >= qp->s_size)
|
|
qp->s_cur = 0;
|
|
break;
|
|
|
|
case OP(RDMA_READ_RESPONSE_LAST):
|
|
/*
|
|
* qp->s_state is normally set to the opcode of the
|
|
* last packet constructed for new requests and therefore
|
|
* is never set to RDMA read response.
|
|
* RDMA_READ_RESPONSE_LAST is used by the ACK processing
|
|
* thread to indicate a RDMA write needs to be restarted from
|
|
* an earlier PSN without interferring with the sending thread.
|
|
* See qib_restart_rc().
|
|
*/
|
|
qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
|
|
fallthrough;
|
|
case OP(RDMA_WRITE_FIRST):
|
|
qp->s_state = OP(RDMA_WRITE_MIDDLE);
|
|
fallthrough;
|
|
case OP(RDMA_WRITE_MIDDLE):
|
|
bth2 = qp->s_psn++ & QIB_PSN_MASK;
|
|
ss = &qp->s_sge;
|
|
len = qp->s_len;
|
|
if (len > pmtu) {
|
|
len = pmtu;
|
|
break;
|
|
}
|
|
if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
|
|
qp->s_state = OP(RDMA_WRITE_LAST);
|
|
else {
|
|
qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
|
|
/* Immediate data comes after the BTH */
|
|
ohdr->u.imm_data = wqe->wr.ex.imm_data;
|
|
hwords += 1;
|
|
if (wqe->wr.send_flags & IB_SEND_SOLICITED)
|
|
bth0 |= IB_BTH_SOLICITED;
|
|
}
|
|
bth2 |= IB_BTH_REQ_ACK;
|
|
qp->s_cur++;
|
|
if (qp->s_cur >= qp->s_size)
|
|
qp->s_cur = 0;
|
|
break;
|
|
|
|
case OP(RDMA_READ_RESPONSE_MIDDLE):
|
|
/*
|
|
* qp->s_state is normally set to the opcode of the
|
|
* last packet constructed for new requests and therefore
|
|
* is never set to RDMA read response.
|
|
* RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing
|
|
* thread to indicate a RDMA read needs to be restarted from
|
|
* an earlier PSN without interferring with the sending thread.
|
|
* See qib_restart_rc().
|
|
*/
|
|
len = ((qp->s_psn - wqe->psn) & QIB_PSN_MASK) * pmtu;
|
|
ohdr->u.rc.reth.vaddr =
|
|
cpu_to_be64(wqe->rdma_wr.remote_addr + len);
|
|
ohdr->u.rc.reth.rkey =
|
|
cpu_to_be32(wqe->rdma_wr.rkey);
|
|
ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len);
|
|
qp->s_state = OP(RDMA_READ_REQUEST);
|
|
hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
|
|
bth2 = (qp->s_psn & QIB_PSN_MASK) | IB_BTH_REQ_ACK;
|
|
qp->s_psn = wqe->lpsn + 1;
|
|
ss = NULL;
|
|
len = 0;
|
|
qp->s_cur++;
|
|
if (qp->s_cur == qp->s_size)
|
|
qp->s_cur = 0;
|
|
break;
|
|
}
|
|
qp->s_sending_hpsn = bth2;
|
|
delta = (((int) bth2 - (int) wqe->psn) << 8) >> 8;
|
|
if (delta && delta % QIB_PSN_CREDIT == 0)
|
|
bth2 |= IB_BTH_REQ_ACK;
|
|
if (qp->s_flags & RVT_S_SEND_ONE) {
|
|
qp->s_flags &= ~RVT_S_SEND_ONE;
|
|
qp->s_flags |= RVT_S_WAIT_ACK;
|
|
bth2 |= IB_BTH_REQ_ACK;
|
|
}
|
|
qp->s_len -= len;
|
|
qp->s_hdrwords = hwords;
|
|
qp->s_cur_sge = ss;
|
|
qp->s_cur_size = len;
|
|
qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24), bth2);
|
|
done:
|
|
return 1;
|
|
bail:
|
|
qp->s_flags &= ~RVT_S_BUSY;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* qib_send_rc_ack - Construct an ACK packet and send it
|
|
* @qp: a pointer to the QP
|
|
*
|
|
* This is called from qib_rc_rcv() and qib_kreceive().
|
|
* Note that RDMA reads and atomics are handled in the
|
|
* send side QP state and tasklet.
|
|
*/
|
|
void qib_send_rc_ack(struct rvt_qp *qp)
|
|
{
|
|
struct qib_devdata *dd = dd_from_ibdev(qp->ibqp.device);
|
|
struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
|
|
struct qib_pportdata *ppd = ppd_from_ibp(ibp);
|
|
u64 pbc;
|
|
u16 lrh0;
|
|
u32 bth0;
|
|
u32 hwords;
|
|
u32 pbufn;
|
|
u32 __iomem *piobuf;
|
|
struct ib_header hdr;
|
|
struct ib_other_headers *ohdr;
|
|
u32 control;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&qp->s_lock, flags);
|
|
|
|
if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK))
|
|
goto unlock;
|
|
|
|
/* Don't send ACK or NAK if a RDMA read or atomic is pending. */
|
|
if ((qp->s_flags & RVT_S_RESP_PENDING) || qp->s_rdma_ack_cnt)
|
|
goto queue_ack;
|
|
|
|
/* Construct the header with s_lock held so APM doesn't change it. */
|
|
ohdr = &hdr.u.oth;
|
|
lrh0 = QIB_LRH_BTH;
|
|
/* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */
|
|
hwords = 6;
|
|
if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
|
|
IB_AH_GRH)) {
|
|
hwords += qib_make_grh(ibp, &hdr.u.l.grh,
|
|
rdma_ah_read_grh(&qp->remote_ah_attr),
|
|
hwords, 0);
|
|
ohdr = &hdr.u.l.oth;
|
|
lrh0 = QIB_LRH_GRH;
|
|
}
|
|
/* read pkey_index w/o lock (its atomic) */
|
|
bth0 = qib_get_pkey(ibp, qp->s_pkey_index) | (OP(ACKNOWLEDGE) << 24);
|
|
if (qp->s_mig_state == IB_MIG_MIGRATED)
|
|
bth0 |= IB_BTH_MIG_REQ;
|
|
if (qp->r_nak_state)
|
|
ohdr->u.aeth = cpu_to_be32((qp->r_msn & IB_MSN_MASK) |
|
|
(qp->r_nak_state <<
|
|
IB_AETH_CREDIT_SHIFT));
|
|
else
|
|
ohdr->u.aeth = rvt_compute_aeth(qp);
|
|
lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 |
|
|
rdma_ah_get_sl(&qp->remote_ah_attr) << 4;
|
|
hdr.lrh[0] = cpu_to_be16(lrh0);
|
|
hdr.lrh[1] = cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr));
|
|
hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC);
|
|
hdr.lrh[3] = cpu_to_be16(ppd->lid |
|
|
rdma_ah_get_path_bits(&qp->remote_ah_attr));
|
|
ohdr->bth[0] = cpu_to_be32(bth0);
|
|
ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
|
|
ohdr->bth[2] = cpu_to_be32(qp->r_ack_psn & QIB_PSN_MASK);
|
|
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
|
|
/* Don't try to send ACKs if the link isn't ACTIVE */
|
|
if (!(ppd->lflags & QIBL_LINKACTIVE))
|
|
goto done;
|
|
|
|
control = dd->f_setpbc_control(ppd, hwords + SIZE_OF_CRC,
|
|
qp->s_srate, lrh0 >> 12);
|
|
/* length is + 1 for the control dword */
|
|
pbc = ((u64) control << 32) | (hwords + 1);
|
|
|
|
piobuf = dd->f_getsendbuf(ppd, pbc, &pbufn);
|
|
if (!piobuf) {
|
|
/*
|
|
* We are out of PIO buffers at the moment.
|
|
* Pass responsibility for sending the ACK to the
|
|
* send tasklet so that when a PIO buffer becomes
|
|
* available, the ACK is sent ahead of other outgoing
|
|
* packets.
|
|
*/
|
|
spin_lock_irqsave(&qp->s_lock, flags);
|
|
goto queue_ack;
|
|
}
|
|
|
|
/*
|
|
* Write the pbc.
|
|
* We have to flush after the PBC for correctness
|
|
* on some cpus or WC buffer can be written out of order.
|
|
*/
|
|
writeq(pbc, piobuf);
|
|
|
|
if (dd->flags & QIB_PIO_FLUSH_WC) {
|
|
u32 *hdrp = (u32 *) &hdr;
|
|
|
|
qib_flush_wc();
|
|
qib_pio_copy(piobuf + 2, hdrp, hwords - 1);
|
|
qib_flush_wc();
|
|
__raw_writel(hdrp[hwords - 1], piobuf + hwords + 1);
|
|
} else
|
|
qib_pio_copy(piobuf + 2, (u32 *) &hdr, hwords);
|
|
|
|
if (dd->flags & QIB_USE_SPCL_TRIG) {
|
|
u32 spcl_off = (pbufn >= dd->piobcnt2k) ? 2047 : 1023;
|
|
|
|
qib_flush_wc();
|
|
__raw_writel(0xaebecede, piobuf + spcl_off);
|
|
}
|
|
|
|
qib_flush_wc();
|
|
qib_sendbuf_done(dd, pbufn);
|
|
|
|
this_cpu_inc(ibp->pmastats->n_unicast_xmit);
|
|
goto done;
|
|
|
|
queue_ack:
|
|
if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
|
|
this_cpu_inc(*ibp->rvp.rc_qacks);
|
|
qp->s_flags |= RVT_S_ACK_PENDING | RVT_S_RESP_PENDING;
|
|
qp->s_nak_state = qp->r_nak_state;
|
|
qp->s_ack_psn = qp->r_ack_psn;
|
|
|
|
/* Schedule the send tasklet. */
|
|
qib_schedule_send(qp);
|
|
}
|
|
unlock:
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
done:
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* reset_psn - reset the QP state to send starting from PSN
|
|
* @qp: the QP
|
|
* @psn: the packet sequence number to restart at
|
|
*
|
|
* This is called from qib_rc_rcv() to process an incoming RC ACK
|
|
* for the given QP.
|
|
* Called at interrupt level with the QP s_lock held.
|
|
*/
|
|
static void reset_psn(struct rvt_qp *qp, u32 psn)
|
|
{
|
|
u32 n = qp->s_acked;
|
|
struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, n);
|
|
u32 opcode;
|
|
|
|
qp->s_cur = n;
|
|
|
|
/*
|
|
* If we are starting the request from the beginning,
|
|
* let the normal send code handle initialization.
|
|
*/
|
|
if (qib_cmp24(psn, wqe->psn) <= 0) {
|
|
qp->s_state = OP(SEND_LAST);
|
|
goto done;
|
|
}
|
|
|
|
/* Find the work request opcode corresponding to the given PSN. */
|
|
opcode = wqe->wr.opcode;
|
|
for (;;) {
|
|
int diff;
|
|
|
|
if (++n == qp->s_size)
|
|
n = 0;
|
|
if (n == qp->s_tail)
|
|
break;
|
|
wqe = rvt_get_swqe_ptr(qp, n);
|
|
diff = qib_cmp24(psn, wqe->psn);
|
|
if (diff < 0)
|
|
break;
|
|
qp->s_cur = n;
|
|
/*
|
|
* If we are starting the request from the beginning,
|
|
* let the normal send code handle initialization.
|
|
*/
|
|
if (diff == 0) {
|
|
qp->s_state = OP(SEND_LAST);
|
|
goto done;
|
|
}
|
|
opcode = wqe->wr.opcode;
|
|
}
|
|
|
|
/*
|
|
* Set the state to restart in the middle of a request.
|
|
* Don't change the s_sge, s_cur_sge, or s_cur_size.
|
|
* See qib_make_rc_req().
|
|
*/
|
|
switch (opcode) {
|
|
case IB_WR_SEND:
|
|
case IB_WR_SEND_WITH_IMM:
|
|
qp->s_state = OP(RDMA_READ_RESPONSE_FIRST);
|
|
break;
|
|
|
|
case IB_WR_RDMA_WRITE:
|
|
case IB_WR_RDMA_WRITE_WITH_IMM:
|
|
qp->s_state = OP(RDMA_READ_RESPONSE_LAST);
|
|
break;
|
|
|
|
case IB_WR_RDMA_READ:
|
|
qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE);
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* This case shouldn't happen since its only
|
|
* one PSN per req.
|
|
*/
|
|
qp->s_state = OP(SEND_LAST);
|
|
}
|
|
done:
|
|
qp->s_psn = psn;
|
|
/*
|
|
* Set RVT_S_WAIT_PSN as qib_rc_complete() may start the timer
|
|
* asynchronously before the send tasklet can get scheduled.
|
|
* Doing it in qib_make_rc_req() is too late.
|
|
*/
|
|
if ((qib_cmp24(qp->s_psn, qp->s_sending_hpsn) <= 0) &&
|
|
(qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0))
|
|
qp->s_flags |= RVT_S_WAIT_PSN;
|
|
}
|
|
|
|
/*
|
|
* Back up requester to resend the last un-ACKed request.
|
|
* The QP r_lock and s_lock should be held and interrupts disabled.
|
|
*/
|
|
void qib_restart_rc(struct rvt_qp *qp, u32 psn, int wait)
|
|
{
|
|
struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
|
|
struct qib_ibport *ibp;
|
|
|
|
if (qp->s_retry == 0) {
|
|
if (qp->s_mig_state == IB_MIG_ARMED) {
|
|
qib_migrate_qp(qp);
|
|
qp->s_retry = qp->s_retry_cnt;
|
|
} else if (qp->s_last == qp->s_acked) {
|
|
rvt_send_complete(qp, wqe, IB_WC_RETRY_EXC_ERR);
|
|
rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
|
|
return;
|
|
} else /* XXX need to handle delayed completion */
|
|
return;
|
|
} else
|
|
qp->s_retry--;
|
|
|
|
ibp = to_iport(qp->ibqp.device, qp->port_num);
|
|
if (wqe->wr.opcode == IB_WR_RDMA_READ)
|
|
ibp->rvp.n_rc_resends++;
|
|
else
|
|
ibp->rvp.n_rc_resends += (qp->s_psn - psn) & QIB_PSN_MASK;
|
|
|
|
qp->s_flags &= ~(RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR |
|
|
RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_PSN |
|
|
RVT_S_WAIT_ACK);
|
|
if (wait)
|
|
qp->s_flags |= RVT_S_SEND_ONE;
|
|
reset_psn(qp, psn);
|
|
}
|
|
|
|
/*
|
|
* Set qp->s_sending_psn to the next PSN after the given one.
|
|
* This would be psn+1 except when RDMA reads are present.
|
|
*/
|
|
static void reset_sending_psn(struct rvt_qp *qp, u32 psn)
|
|
{
|
|
struct rvt_swqe *wqe;
|
|
u32 n = qp->s_last;
|
|
|
|
/* Find the work request corresponding to the given PSN. */
|
|
for (;;) {
|
|
wqe = rvt_get_swqe_ptr(qp, n);
|
|
if (qib_cmp24(psn, wqe->lpsn) <= 0) {
|
|
if (wqe->wr.opcode == IB_WR_RDMA_READ)
|
|
qp->s_sending_psn = wqe->lpsn + 1;
|
|
else
|
|
qp->s_sending_psn = psn + 1;
|
|
break;
|
|
}
|
|
if (++n == qp->s_size)
|
|
n = 0;
|
|
if (n == qp->s_tail)
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This should be called with the QP s_lock held and interrupts disabled.
|
|
*/
|
|
void qib_rc_send_complete(struct rvt_qp *qp, struct ib_header *hdr)
|
|
{
|
|
struct ib_other_headers *ohdr;
|
|
struct rvt_swqe *wqe;
|
|
u32 opcode;
|
|
u32 psn;
|
|
|
|
if (!(ib_rvt_state_ops[qp->state] & RVT_SEND_OR_FLUSH_OR_RECV_OK))
|
|
return;
|
|
|
|
/* Find out where the BTH is */
|
|
if ((be16_to_cpu(hdr->lrh[0]) & 3) == QIB_LRH_BTH)
|
|
ohdr = &hdr->u.oth;
|
|
else
|
|
ohdr = &hdr->u.l.oth;
|
|
|
|
opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
|
|
if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
|
|
opcode <= OP(ATOMIC_ACKNOWLEDGE)) {
|
|
WARN_ON(!qp->s_rdma_ack_cnt);
|
|
qp->s_rdma_ack_cnt--;
|
|
return;
|
|
}
|
|
|
|
psn = be32_to_cpu(ohdr->bth[2]);
|
|
reset_sending_psn(qp, psn);
|
|
|
|
/*
|
|
* Start timer after a packet requesting an ACK has been sent and
|
|
* there are still requests that haven't been acked.
|
|
*/
|
|
if ((psn & IB_BTH_REQ_ACK) && qp->s_acked != qp->s_tail &&
|
|
!(qp->s_flags & (RVT_S_TIMER | RVT_S_WAIT_RNR | RVT_S_WAIT_PSN)) &&
|
|
(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK))
|
|
rvt_add_retry_timer(qp);
|
|
|
|
while (qp->s_last != qp->s_acked) {
|
|
wqe = rvt_get_swqe_ptr(qp, qp->s_last);
|
|
if (qib_cmp24(wqe->lpsn, qp->s_sending_psn) >= 0 &&
|
|
qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)
|
|
break;
|
|
rvt_qp_complete_swqe(qp,
|
|
wqe,
|
|
ib_qib_wc_opcode[wqe->wr.opcode],
|
|
IB_WC_SUCCESS);
|
|
}
|
|
/*
|
|
* If we were waiting for sends to complete before resending,
|
|
* and they are now complete, restart sending.
|
|
*/
|
|
if (qp->s_flags & RVT_S_WAIT_PSN &&
|
|
qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) > 0) {
|
|
qp->s_flags &= ~RVT_S_WAIT_PSN;
|
|
qp->s_sending_psn = qp->s_psn;
|
|
qp->s_sending_hpsn = qp->s_psn - 1;
|
|
qib_schedule_send(qp);
|
|
}
|
|
}
|
|
|
|
static inline void update_last_psn(struct rvt_qp *qp, u32 psn)
|
|
{
|
|
qp->s_last_psn = psn;
|
|
}
|
|
|
|
/*
|
|
* Generate a SWQE completion.
|
|
* This is similar to qib_send_complete but has to check to be sure
|
|
* that the SGEs are not being referenced if the SWQE is being resent.
|
|
*/
|
|
static struct rvt_swqe *do_rc_completion(struct rvt_qp *qp,
|
|
struct rvt_swqe *wqe,
|
|
struct qib_ibport *ibp)
|
|
{
|
|
/*
|
|
* Don't decrement refcount and don't generate a
|
|
* completion if the SWQE is being resent until the send
|
|
* is finished.
|
|
*/
|
|
if (qib_cmp24(wqe->lpsn, qp->s_sending_psn) < 0 ||
|
|
qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) > 0)
|
|
rvt_qp_complete_swqe(qp,
|
|
wqe,
|
|
ib_qib_wc_opcode[wqe->wr.opcode],
|
|
IB_WC_SUCCESS);
|
|
else
|
|
this_cpu_inc(*ibp->rvp.rc_delayed_comp);
|
|
|
|
qp->s_retry = qp->s_retry_cnt;
|
|
update_last_psn(qp, wqe->lpsn);
|
|
|
|
/*
|
|
* If we are completing a request which is in the process of
|
|
* being resent, we can stop resending it since we know the
|
|
* responder has already seen it.
|
|
*/
|
|
if (qp->s_acked == qp->s_cur) {
|
|
if (++qp->s_cur >= qp->s_size)
|
|
qp->s_cur = 0;
|
|
qp->s_acked = qp->s_cur;
|
|
wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
|
|
if (qp->s_acked != qp->s_tail) {
|
|
qp->s_state = OP(SEND_LAST);
|
|
qp->s_psn = wqe->psn;
|
|
}
|
|
} else {
|
|
if (++qp->s_acked >= qp->s_size)
|
|
qp->s_acked = 0;
|
|
if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur)
|
|
qp->s_draining = 0;
|
|
wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
|
|
}
|
|
return wqe;
|
|
}
|
|
|
|
/*
|
|
* do_rc_ack - process an incoming RC ACK
|
|
* @qp: the QP the ACK came in on
|
|
* @psn: the packet sequence number of the ACK
|
|
* @opcode: the opcode of the request that resulted in the ACK
|
|
*
|
|
* This is called from qib_rc_rcv_resp() to process an incoming RC ACK
|
|
* for the given QP.
|
|
* Called at interrupt level with the QP s_lock held.
|
|
* Returns 1 if OK, 0 if current operation should be aborted (NAK).
|
|
*/
|
|
static int do_rc_ack(struct rvt_qp *qp, u32 aeth, u32 psn, int opcode,
|
|
u64 val, struct qib_ctxtdata *rcd)
|
|
{
|
|
struct qib_ibport *ibp;
|
|
enum ib_wc_status status;
|
|
struct rvt_swqe *wqe;
|
|
int ret = 0;
|
|
u32 ack_psn;
|
|
int diff;
|
|
|
|
/*
|
|
* Note that NAKs implicitly ACK outstanding SEND and RDMA write
|
|
* requests and implicitly NAK RDMA read and atomic requests issued
|
|
* before the NAK'ed request. The MSN won't include the NAK'ed
|
|
* request but will include an ACK'ed request(s).
|
|
*/
|
|
ack_psn = psn;
|
|
if (aeth >> IB_AETH_NAK_SHIFT)
|
|
ack_psn--;
|
|
wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
|
|
ibp = to_iport(qp->ibqp.device, qp->port_num);
|
|
|
|
/*
|
|
* The MSN might be for a later WQE than the PSN indicates so
|
|
* only complete WQEs that the PSN finishes.
|
|
*/
|
|
while ((diff = qib_cmp24(ack_psn, wqe->lpsn)) >= 0) {
|
|
/*
|
|
* RDMA_READ_RESPONSE_ONLY is a special case since
|
|
* we want to generate completion events for everything
|
|
* before the RDMA read, copy the data, then generate
|
|
* the completion for the read.
|
|
*/
|
|
if (wqe->wr.opcode == IB_WR_RDMA_READ &&
|
|
opcode == OP(RDMA_READ_RESPONSE_ONLY) &&
|
|
diff == 0) {
|
|
ret = 1;
|
|
goto bail;
|
|
}
|
|
/*
|
|
* If this request is a RDMA read or atomic, and the ACK is
|
|
* for a later operation, this ACK NAKs the RDMA read or
|
|
* atomic. In other words, only a RDMA_READ_LAST or ONLY
|
|
* can ACK a RDMA read and likewise for atomic ops. Note
|
|
* that the NAK case can only happen if relaxed ordering is
|
|
* used and requests are sent after an RDMA read or atomic
|
|
* is sent but before the response is received.
|
|
*/
|
|
if ((wqe->wr.opcode == IB_WR_RDMA_READ &&
|
|
(opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) ||
|
|
((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
|
|
wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) &&
|
|
(opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) {
|
|
/* Retry this request. */
|
|
if (!(qp->r_flags & RVT_R_RDMAR_SEQ)) {
|
|
qp->r_flags |= RVT_R_RDMAR_SEQ;
|
|
qib_restart_rc(qp, qp->s_last_psn + 1, 0);
|
|
if (list_empty(&qp->rspwait)) {
|
|
qp->r_flags |= RVT_R_RSP_SEND;
|
|
rvt_get_qp(qp);
|
|
list_add_tail(&qp->rspwait,
|
|
&rcd->qp_wait_list);
|
|
}
|
|
}
|
|
/*
|
|
* No need to process the ACK/NAK since we are
|
|
* restarting an earlier request.
|
|
*/
|
|
goto bail;
|
|
}
|
|
if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
|
|
wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) {
|
|
u64 *vaddr = wqe->sg_list[0].vaddr;
|
|
*vaddr = val;
|
|
}
|
|
if (qp->s_num_rd_atomic &&
|
|
(wqe->wr.opcode == IB_WR_RDMA_READ ||
|
|
wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
|
|
wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) {
|
|
qp->s_num_rd_atomic--;
|
|
/* Restart sending task if fence is complete */
|
|
if ((qp->s_flags & RVT_S_WAIT_FENCE) &&
|
|
!qp->s_num_rd_atomic) {
|
|
qp->s_flags &= ~(RVT_S_WAIT_FENCE |
|
|
RVT_S_WAIT_ACK);
|
|
qib_schedule_send(qp);
|
|
} else if (qp->s_flags & RVT_S_WAIT_RDMAR) {
|
|
qp->s_flags &= ~(RVT_S_WAIT_RDMAR |
|
|
RVT_S_WAIT_ACK);
|
|
qib_schedule_send(qp);
|
|
}
|
|
}
|
|
wqe = do_rc_completion(qp, wqe, ibp);
|
|
if (qp->s_acked == qp->s_tail)
|
|
break;
|
|
}
|
|
|
|
switch (aeth >> IB_AETH_NAK_SHIFT) {
|
|
case 0: /* ACK */
|
|
this_cpu_inc(*ibp->rvp.rc_acks);
|
|
if (qp->s_acked != qp->s_tail) {
|
|
/*
|
|
* We are expecting more ACKs so
|
|
* reset the retransmit timer.
|
|
*/
|
|
rvt_mod_retry_timer(qp);
|
|
/*
|
|
* We can stop resending the earlier packets and
|
|
* continue with the next packet the receiver wants.
|
|
*/
|
|
if (qib_cmp24(qp->s_psn, psn) <= 0)
|
|
reset_psn(qp, psn + 1);
|
|
} else {
|
|
/* No more acks - kill all timers */
|
|
rvt_stop_rc_timers(qp);
|
|
if (qib_cmp24(qp->s_psn, psn) <= 0) {
|
|
qp->s_state = OP(SEND_LAST);
|
|
qp->s_psn = psn + 1;
|
|
}
|
|
}
|
|
if (qp->s_flags & RVT_S_WAIT_ACK) {
|
|
qp->s_flags &= ~RVT_S_WAIT_ACK;
|
|
qib_schedule_send(qp);
|
|
}
|
|
rvt_get_credit(qp, aeth);
|
|
qp->s_rnr_retry = qp->s_rnr_retry_cnt;
|
|
qp->s_retry = qp->s_retry_cnt;
|
|
update_last_psn(qp, psn);
|
|
return 1;
|
|
|
|
case 1: /* RNR NAK */
|
|
ibp->rvp.n_rnr_naks++;
|
|
if (qp->s_acked == qp->s_tail)
|
|
goto bail;
|
|
if (qp->s_flags & RVT_S_WAIT_RNR)
|
|
goto bail;
|
|
if (qp->s_rnr_retry == 0) {
|
|
status = IB_WC_RNR_RETRY_EXC_ERR;
|
|
goto class_b;
|
|
}
|
|
if (qp->s_rnr_retry_cnt < 7)
|
|
qp->s_rnr_retry--;
|
|
|
|
/* The last valid PSN is the previous PSN. */
|
|
update_last_psn(qp, psn - 1);
|
|
|
|
ibp->rvp.n_rc_resends += (qp->s_psn - psn) & QIB_PSN_MASK;
|
|
|
|
reset_psn(qp, psn);
|
|
|
|
qp->s_flags &= ~(RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_ACK);
|
|
rvt_stop_rc_timers(qp);
|
|
rvt_add_rnr_timer(qp, aeth);
|
|
return 0;
|
|
|
|
case 3: /* NAK */
|
|
if (qp->s_acked == qp->s_tail)
|
|
goto bail;
|
|
/* The last valid PSN is the previous PSN. */
|
|
update_last_psn(qp, psn - 1);
|
|
switch ((aeth >> IB_AETH_CREDIT_SHIFT) &
|
|
IB_AETH_CREDIT_MASK) {
|
|
case 0: /* PSN sequence error */
|
|
ibp->rvp.n_seq_naks++;
|
|
/*
|
|
* Back up to the responder's expected PSN.
|
|
* Note that we might get a NAK in the middle of an
|
|
* RDMA READ response which terminates the RDMA
|
|
* READ.
|
|
*/
|
|
qib_restart_rc(qp, psn, 0);
|
|
qib_schedule_send(qp);
|
|
break;
|
|
|
|
case 1: /* Invalid Request */
|
|
status = IB_WC_REM_INV_REQ_ERR;
|
|
ibp->rvp.n_other_naks++;
|
|
goto class_b;
|
|
|
|
case 2: /* Remote Access Error */
|
|
status = IB_WC_REM_ACCESS_ERR;
|
|
ibp->rvp.n_other_naks++;
|
|
goto class_b;
|
|
|
|
case 3: /* Remote Operation Error */
|
|
status = IB_WC_REM_OP_ERR;
|
|
ibp->rvp.n_other_naks++;
|
|
class_b:
|
|
if (qp->s_last == qp->s_acked) {
|
|
rvt_send_complete(qp, wqe, status);
|
|
rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
/* Ignore other reserved NAK error codes */
|
|
goto reserved;
|
|
}
|
|
qp->s_retry = qp->s_retry_cnt;
|
|
qp->s_rnr_retry = qp->s_rnr_retry_cnt;
|
|
goto bail;
|
|
|
|
default: /* 2: reserved */
|
|
reserved:
|
|
/* Ignore reserved NAK codes. */
|
|
goto bail;
|
|
}
|
|
|
|
bail:
|
|
rvt_stop_rc_timers(qp);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* We have seen an out of sequence RDMA read middle or last packet.
|
|
* This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE.
|
|
*/
|
|
static void rdma_seq_err(struct rvt_qp *qp, struct qib_ibport *ibp, u32 psn,
|
|
struct qib_ctxtdata *rcd)
|
|
{
|
|
struct rvt_swqe *wqe;
|
|
|
|
/* Remove QP from retry timer */
|
|
rvt_stop_rc_timers(qp);
|
|
|
|
wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
|
|
|
|
while (qib_cmp24(psn, wqe->lpsn) > 0) {
|
|
if (wqe->wr.opcode == IB_WR_RDMA_READ ||
|
|
wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
|
|
wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)
|
|
break;
|
|
wqe = do_rc_completion(qp, wqe, ibp);
|
|
}
|
|
|
|
ibp->rvp.n_rdma_seq++;
|
|
qp->r_flags |= RVT_R_RDMAR_SEQ;
|
|
qib_restart_rc(qp, qp->s_last_psn + 1, 0);
|
|
if (list_empty(&qp->rspwait)) {
|
|
qp->r_flags |= RVT_R_RSP_SEND;
|
|
rvt_get_qp(qp);
|
|
list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* qib_rc_rcv_resp - process an incoming RC response packet
|
|
* @ibp: the port this packet came in on
|
|
* @ohdr: the other headers for this packet
|
|
* @data: the packet data
|
|
* @tlen: the packet length
|
|
* @qp: the QP for this packet
|
|
* @opcode: the opcode for this packet
|
|
* @psn: the packet sequence number for this packet
|
|
* @hdrsize: the header length
|
|
* @pmtu: the path MTU
|
|
* @rcd: the context pointer
|
|
*
|
|
* This is called from qib_rc_rcv() to process an incoming RC response
|
|
* packet for the given QP.
|
|
* Called at interrupt level.
|
|
*/
|
|
static void qib_rc_rcv_resp(struct qib_ibport *ibp,
|
|
struct ib_other_headers *ohdr,
|
|
void *data, u32 tlen,
|
|
struct rvt_qp *qp,
|
|
u32 opcode,
|
|
u32 psn, u32 hdrsize, u32 pmtu,
|
|
struct qib_ctxtdata *rcd)
|
|
{
|
|
struct rvt_swqe *wqe;
|
|
struct qib_pportdata *ppd = ppd_from_ibp(ibp);
|
|
enum ib_wc_status status;
|
|
unsigned long flags;
|
|
int diff;
|
|
u32 pad;
|
|
u32 aeth;
|
|
u64 val;
|
|
|
|
if (opcode != OP(RDMA_READ_RESPONSE_MIDDLE)) {
|
|
/*
|
|
* If ACK'd PSN on SDMA busy list try to make progress to
|
|
* reclaim SDMA credits.
|
|
*/
|
|
if ((qib_cmp24(psn, qp->s_sending_psn) >= 0) &&
|
|
(qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) {
|
|
|
|
/*
|
|
* If send tasklet not running attempt to progress
|
|
* SDMA queue.
|
|
*/
|
|
if (!(qp->s_flags & RVT_S_BUSY)) {
|
|
/* Acquire SDMA Lock */
|
|
spin_lock_irqsave(&ppd->sdma_lock, flags);
|
|
/* Invoke sdma make progress */
|
|
qib_sdma_make_progress(ppd);
|
|
/* Release SDMA Lock */
|
|
spin_unlock_irqrestore(&ppd->sdma_lock, flags);
|
|
}
|
|
}
|
|
}
|
|
|
|
spin_lock_irqsave(&qp->s_lock, flags);
|
|
if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK))
|
|
goto ack_done;
|
|
|
|
/* Ignore invalid responses. */
|
|
if (qib_cmp24(psn, READ_ONCE(qp->s_next_psn)) >= 0)
|
|
goto ack_done;
|
|
|
|
/* Ignore duplicate responses. */
|
|
diff = qib_cmp24(psn, qp->s_last_psn);
|
|
if (unlikely(diff <= 0)) {
|
|
/* Update credits for "ghost" ACKs */
|
|
if (diff == 0 && opcode == OP(ACKNOWLEDGE)) {
|
|
aeth = be32_to_cpu(ohdr->u.aeth);
|
|
if ((aeth >> IB_AETH_NAK_SHIFT) == 0)
|
|
rvt_get_credit(qp, aeth);
|
|
}
|
|
goto ack_done;
|
|
}
|
|
|
|
/*
|
|
* Skip everything other than the PSN we expect, if we are waiting
|
|
* for a reply to a restarted RDMA read or atomic op.
|
|
*/
|
|
if (qp->r_flags & RVT_R_RDMAR_SEQ) {
|
|
if (qib_cmp24(psn, qp->s_last_psn + 1) != 0)
|
|
goto ack_done;
|
|
qp->r_flags &= ~RVT_R_RDMAR_SEQ;
|
|
}
|
|
|
|
if (unlikely(qp->s_acked == qp->s_tail))
|
|
goto ack_done;
|
|
wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
|
|
status = IB_WC_SUCCESS;
|
|
|
|
switch (opcode) {
|
|
case OP(ACKNOWLEDGE):
|
|
case OP(ATOMIC_ACKNOWLEDGE):
|
|
case OP(RDMA_READ_RESPONSE_FIRST):
|
|
aeth = be32_to_cpu(ohdr->u.aeth);
|
|
if (opcode == OP(ATOMIC_ACKNOWLEDGE))
|
|
val = ib_u64_get(&ohdr->u.at.atomic_ack_eth);
|
|
else
|
|
val = 0;
|
|
if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) ||
|
|
opcode != OP(RDMA_READ_RESPONSE_FIRST))
|
|
goto ack_done;
|
|
hdrsize += 4;
|
|
wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
|
|
if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
|
|
goto ack_op_err;
|
|
/*
|
|
* If this is a response to a resent RDMA read, we
|
|
* have to be careful to copy the data to the right
|
|
* location.
|
|
*/
|
|
qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge,
|
|
wqe, psn, pmtu);
|
|
goto read_middle;
|
|
|
|
case OP(RDMA_READ_RESPONSE_MIDDLE):
|
|
/* no AETH, no ACK */
|
|
if (unlikely(qib_cmp24(psn, qp->s_last_psn + 1)))
|
|
goto ack_seq_err;
|
|
if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
|
|
goto ack_op_err;
|
|
read_middle:
|
|
if (unlikely(tlen != (hdrsize + pmtu + 4)))
|
|
goto ack_len_err;
|
|
if (unlikely(pmtu >= qp->s_rdma_read_len))
|
|
goto ack_len_err;
|
|
|
|
/*
|
|
* We got a response so update the timeout.
|
|
* 4.096 usec. * (1 << qp->timeout)
|
|
*/
|
|
rvt_mod_retry_timer(qp);
|
|
if (qp->s_flags & RVT_S_WAIT_ACK) {
|
|
qp->s_flags &= ~RVT_S_WAIT_ACK;
|
|
qib_schedule_send(qp);
|
|
}
|
|
|
|
if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE))
|
|
qp->s_retry = qp->s_retry_cnt;
|
|
|
|
/*
|
|
* Update the RDMA receive state but do the copy w/o
|
|
* holding the locks and blocking interrupts.
|
|
*/
|
|
qp->s_rdma_read_len -= pmtu;
|
|
update_last_psn(qp, psn);
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
rvt_copy_sge(qp, &qp->s_rdma_read_sge,
|
|
data, pmtu, false, false);
|
|
goto bail;
|
|
|
|
case OP(RDMA_READ_RESPONSE_ONLY):
|
|
aeth = be32_to_cpu(ohdr->u.aeth);
|
|
if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd))
|
|
goto ack_done;
|
|
/* Get the number of bytes the message was padded by. */
|
|
pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
|
|
/*
|
|
* Check that the data size is >= 0 && <= pmtu.
|
|
* Remember to account for the AETH header (4) and
|
|
* ICRC (4).
|
|
*/
|
|
if (unlikely(tlen < (hdrsize + pad + 8)))
|
|
goto ack_len_err;
|
|
/*
|
|
* If this is a response to a resent RDMA read, we
|
|
* have to be careful to copy the data to the right
|
|
* location.
|
|
*/
|
|
wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
|
|
qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge,
|
|
wqe, psn, pmtu);
|
|
goto read_last;
|
|
|
|
case OP(RDMA_READ_RESPONSE_LAST):
|
|
/* ACKs READ req. */
|
|
if (unlikely(qib_cmp24(psn, qp->s_last_psn + 1)))
|
|
goto ack_seq_err;
|
|
if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
|
|
goto ack_op_err;
|
|
/* Get the number of bytes the message was padded by. */
|
|
pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
|
|
/*
|
|
* Check that the data size is >= 1 && <= pmtu.
|
|
* Remember to account for the AETH header (4) and
|
|
* ICRC (4).
|
|
*/
|
|
if (unlikely(tlen <= (hdrsize + pad + 8)))
|
|
goto ack_len_err;
|
|
read_last:
|
|
tlen -= hdrsize + pad + 8;
|
|
if (unlikely(tlen != qp->s_rdma_read_len))
|
|
goto ack_len_err;
|
|
aeth = be32_to_cpu(ohdr->u.aeth);
|
|
rvt_copy_sge(qp, &qp->s_rdma_read_sge,
|
|
data, tlen, false, false);
|
|
WARN_ON(qp->s_rdma_read_sge.num_sge);
|
|
(void) do_rc_ack(qp, aeth, psn,
|
|
OP(RDMA_READ_RESPONSE_LAST), 0, rcd);
|
|
goto ack_done;
|
|
}
|
|
|
|
ack_op_err:
|
|
status = IB_WC_LOC_QP_OP_ERR;
|
|
goto ack_err;
|
|
|
|
ack_seq_err:
|
|
rdma_seq_err(qp, ibp, psn, rcd);
|
|
goto ack_done;
|
|
|
|
ack_len_err:
|
|
status = IB_WC_LOC_LEN_ERR;
|
|
ack_err:
|
|
if (qp->s_last == qp->s_acked) {
|
|
rvt_send_complete(qp, wqe, status);
|
|
rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
|
|
}
|
|
ack_done:
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
bail:
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* qib_rc_rcv_error - process an incoming duplicate or error RC packet
|
|
* @ohdr: the other headers for this packet
|
|
* @data: the packet data
|
|
* @qp: the QP for this packet
|
|
* @opcode: the opcode for this packet
|
|
* @psn: the packet sequence number for this packet
|
|
* @diff: the difference between the PSN and the expected PSN
|
|
* @rcd: the context pointer
|
|
*
|
|
* This is called from qib_rc_rcv() to process an unexpected
|
|
* incoming RC packet for the given QP.
|
|
* Called at interrupt level.
|
|
* Return 1 if no more processing is needed; otherwise return 0 to
|
|
* schedule a response to be sent.
|
|
*/
|
|
static int qib_rc_rcv_error(struct ib_other_headers *ohdr,
|
|
void *data,
|
|
struct rvt_qp *qp,
|
|
u32 opcode,
|
|
u32 psn,
|
|
int diff,
|
|
struct qib_ctxtdata *rcd)
|
|
{
|
|
struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
|
|
struct rvt_ack_entry *e;
|
|
unsigned long flags;
|
|
u8 i, prev;
|
|
int old_req;
|
|
|
|
if (diff > 0) {
|
|
/*
|
|
* Packet sequence error.
|
|
* A NAK will ACK earlier sends and RDMA writes.
|
|
* Don't queue the NAK if we already sent one.
|
|
*/
|
|
if (!qp->r_nak_state) {
|
|
ibp->rvp.n_rc_seqnak++;
|
|
qp->r_nak_state = IB_NAK_PSN_ERROR;
|
|
/* Use the expected PSN. */
|
|
qp->r_ack_psn = qp->r_psn;
|
|
/*
|
|
* Wait to send the sequence NAK until all packets
|
|
* in the receive queue have been processed.
|
|
* Otherwise, we end up propagating congestion.
|
|
*/
|
|
if (list_empty(&qp->rspwait)) {
|
|
qp->r_flags |= RVT_R_RSP_NAK;
|
|
rvt_get_qp(qp);
|
|
list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
|
|
}
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Handle a duplicate request. Don't re-execute SEND, RDMA
|
|
* write or atomic op. Don't NAK errors, just silently drop
|
|
* the duplicate request. Note that r_sge, r_len, and
|
|
* r_rcv_len may be in use so don't modify them.
|
|
*
|
|
* We are supposed to ACK the earliest duplicate PSN but we
|
|
* can coalesce an outstanding duplicate ACK. We have to
|
|
* send the earliest so that RDMA reads can be restarted at
|
|
* the requester's expected PSN.
|
|
*
|
|
* First, find where this duplicate PSN falls within the
|
|
* ACKs previously sent.
|
|
* old_req is true if there is an older response that is scheduled
|
|
* to be sent before sending this one.
|
|
*/
|
|
e = NULL;
|
|
old_req = 1;
|
|
ibp->rvp.n_rc_dupreq++;
|
|
|
|
spin_lock_irqsave(&qp->s_lock, flags);
|
|
|
|
for (i = qp->r_head_ack_queue; ; i = prev) {
|
|
if (i == qp->s_tail_ack_queue)
|
|
old_req = 0;
|
|
if (i)
|
|
prev = i - 1;
|
|
else
|
|
prev = QIB_MAX_RDMA_ATOMIC;
|
|
if (prev == qp->r_head_ack_queue) {
|
|
e = NULL;
|
|
break;
|
|
}
|
|
e = &qp->s_ack_queue[prev];
|
|
if (!e->opcode) {
|
|
e = NULL;
|
|
break;
|
|
}
|
|
if (qib_cmp24(psn, e->psn) >= 0) {
|
|
if (prev == qp->s_tail_ack_queue &&
|
|
qib_cmp24(psn, e->lpsn) <= 0)
|
|
old_req = 0;
|
|
break;
|
|
}
|
|
}
|
|
switch (opcode) {
|
|
case OP(RDMA_READ_REQUEST): {
|
|
struct ib_reth *reth;
|
|
u32 offset;
|
|
u32 len;
|
|
|
|
/*
|
|
* If we didn't find the RDMA read request in the ack queue,
|
|
* we can ignore this request.
|
|
*/
|
|
if (!e || e->opcode != OP(RDMA_READ_REQUEST))
|
|
goto unlock_done;
|
|
/* RETH comes after BTH */
|
|
reth = &ohdr->u.rc.reth;
|
|
/*
|
|
* Address range must be a subset of the original
|
|
* request and start on pmtu boundaries.
|
|
* We reuse the old ack_queue slot since the requester
|
|
* should not back up and request an earlier PSN for the
|
|
* same request.
|
|
*/
|
|
offset = ((psn - e->psn) & QIB_PSN_MASK) *
|
|
qp->pmtu;
|
|
len = be32_to_cpu(reth->length);
|
|
if (unlikely(offset + len != e->rdma_sge.sge_length))
|
|
goto unlock_done;
|
|
if (e->rdma_sge.mr) {
|
|
rvt_put_mr(e->rdma_sge.mr);
|
|
e->rdma_sge.mr = NULL;
|
|
}
|
|
if (len != 0) {
|
|
u32 rkey = be32_to_cpu(reth->rkey);
|
|
u64 vaddr = be64_to_cpu(reth->vaddr);
|
|
int ok;
|
|
|
|
ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey,
|
|
IB_ACCESS_REMOTE_READ);
|
|
if (unlikely(!ok))
|
|
goto unlock_done;
|
|
} else {
|
|
e->rdma_sge.vaddr = NULL;
|
|
e->rdma_sge.length = 0;
|
|
e->rdma_sge.sge_length = 0;
|
|
}
|
|
e->psn = psn;
|
|
if (old_req)
|
|
goto unlock_done;
|
|
qp->s_tail_ack_queue = prev;
|
|
break;
|
|
}
|
|
|
|
case OP(COMPARE_SWAP):
|
|
case OP(FETCH_ADD): {
|
|
/*
|
|
* If we didn't find the atomic request in the ack queue
|
|
* or the send tasklet is already backed up to send an
|
|
* earlier entry, we can ignore this request.
|
|
*/
|
|
if (!e || e->opcode != (u8) opcode || old_req)
|
|
goto unlock_done;
|
|
qp->s_tail_ack_queue = prev;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
/*
|
|
* Ignore this operation if it doesn't request an ACK
|
|
* or an earlier RDMA read or atomic is going to be resent.
|
|
*/
|
|
if (!(psn & IB_BTH_REQ_ACK) || old_req)
|
|
goto unlock_done;
|
|
/*
|
|
* Resend the most recent ACK if this request is
|
|
* after all the previous RDMA reads and atomics.
|
|
*/
|
|
if (i == qp->r_head_ack_queue) {
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
qp->r_nak_state = 0;
|
|
qp->r_ack_psn = qp->r_psn - 1;
|
|
goto send_ack;
|
|
}
|
|
/*
|
|
* Try to send a simple ACK to work around a Mellanox bug
|
|
* which doesn't accept a RDMA read response or atomic
|
|
* response as an ACK for earlier SENDs or RDMA writes.
|
|
*/
|
|
if (!(qp->s_flags & RVT_S_RESP_PENDING)) {
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
qp->r_nak_state = 0;
|
|
qp->r_ack_psn = qp->s_ack_queue[i].psn - 1;
|
|
goto send_ack;
|
|
}
|
|
/*
|
|
* Resend the RDMA read or atomic op which
|
|
* ACKs this duplicate request.
|
|
*/
|
|
qp->s_tail_ack_queue = i;
|
|
break;
|
|
}
|
|
qp->s_ack_state = OP(ACKNOWLEDGE);
|
|
qp->s_flags |= RVT_S_RESP_PENDING;
|
|
qp->r_nak_state = 0;
|
|
qib_schedule_send(qp);
|
|
|
|
unlock_done:
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
done:
|
|
return 1;
|
|
|
|
send_ack:
|
|
return 0;
|
|
}
|
|
|
|
static inline void qib_update_ack_queue(struct rvt_qp *qp, unsigned n)
|
|
{
|
|
unsigned next;
|
|
|
|
next = n + 1;
|
|
if (next > QIB_MAX_RDMA_ATOMIC)
|
|
next = 0;
|
|
qp->s_tail_ack_queue = next;
|
|
qp->s_ack_state = OP(ACKNOWLEDGE);
|
|
}
|
|
|
|
/**
|
|
* qib_rc_rcv - process an incoming RC packet
|
|
* @rcd: the context pointer
|
|
* @hdr: the header of this packet
|
|
* @has_grh: true if the header has a GRH
|
|
* @data: the packet data
|
|
* @tlen: the packet length
|
|
* @qp: the QP for this packet
|
|
*
|
|
* This is called from qib_qp_rcv() to process an incoming RC packet
|
|
* for the given QP.
|
|
* Called at interrupt level.
|
|
*/
|
|
void qib_rc_rcv(struct qib_ctxtdata *rcd, struct ib_header *hdr,
|
|
int has_grh, void *data, u32 tlen, struct rvt_qp *qp)
|
|
{
|
|
struct qib_ibport *ibp = &rcd->ppd->ibport_data;
|
|
struct ib_other_headers *ohdr;
|
|
u32 opcode;
|
|
u32 hdrsize;
|
|
u32 psn;
|
|
u32 pad;
|
|
struct ib_wc wc;
|
|
u32 pmtu = qp->pmtu;
|
|
int diff;
|
|
struct ib_reth *reth;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
/* Check for GRH */
|
|
if (!has_grh) {
|
|
ohdr = &hdr->u.oth;
|
|
hdrsize = 8 + 12; /* LRH + BTH */
|
|
} else {
|
|
ohdr = &hdr->u.l.oth;
|
|
hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */
|
|
}
|
|
|
|
opcode = be32_to_cpu(ohdr->bth[0]);
|
|
if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
|
|
return;
|
|
|
|
psn = be32_to_cpu(ohdr->bth[2]);
|
|
opcode >>= 24;
|
|
|
|
/*
|
|
* Process responses (ACKs) before anything else. Note that the
|
|
* packet sequence number will be for something in the send work
|
|
* queue rather than the expected receive packet sequence number.
|
|
* In other words, this QP is the requester.
|
|
*/
|
|
if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
|
|
opcode <= OP(ATOMIC_ACKNOWLEDGE)) {
|
|
qib_rc_rcv_resp(ibp, ohdr, data, tlen, qp, opcode, psn,
|
|
hdrsize, pmtu, rcd);
|
|
return;
|
|
}
|
|
|
|
/* Compute 24 bits worth of difference. */
|
|
diff = qib_cmp24(psn, qp->r_psn);
|
|
if (unlikely(diff)) {
|
|
if (qib_rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd))
|
|
return;
|
|
goto send_ack;
|
|
}
|
|
|
|
/* Check for opcode sequence errors. */
|
|
switch (qp->r_state) {
|
|
case OP(SEND_FIRST):
|
|
case OP(SEND_MIDDLE):
|
|
if (opcode == OP(SEND_MIDDLE) ||
|
|
opcode == OP(SEND_LAST) ||
|
|
opcode == OP(SEND_LAST_WITH_IMMEDIATE))
|
|
break;
|
|
goto nack_inv;
|
|
|
|
case OP(RDMA_WRITE_FIRST):
|
|
case OP(RDMA_WRITE_MIDDLE):
|
|
if (opcode == OP(RDMA_WRITE_MIDDLE) ||
|
|
opcode == OP(RDMA_WRITE_LAST) ||
|
|
opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
|
|
break;
|
|
goto nack_inv;
|
|
|
|
default:
|
|
if (opcode == OP(SEND_MIDDLE) ||
|
|
opcode == OP(SEND_LAST) ||
|
|
opcode == OP(SEND_LAST_WITH_IMMEDIATE) ||
|
|
opcode == OP(RDMA_WRITE_MIDDLE) ||
|
|
opcode == OP(RDMA_WRITE_LAST) ||
|
|
opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
|
|
goto nack_inv;
|
|
/*
|
|
* Note that it is up to the requester to not send a new
|
|
* RDMA read or atomic operation before receiving an ACK
|
|
* for the previous operation.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
|
|
rvt_comm_est(qp);
|
|
|
|
/* OK, process the packet. */
|
|
switch (opcode) {
|
|
case OP(SEND_FIRST):
|
|
ret = rvt_get_rwqe(qp, false);
|
|
if (ret < 0)
|
|
goto nack_op_err;
|
|
if (!ret)
|
|
goto rnr_nak;
|
|
qp->r_rcv_len = 0;
|
|
fallthrough;
|
|
case OP(SEND_MIDDLE):
|
|
case OP(RDMA_WRITE_MIDDLE):
|
|
send_middle:
|
|
/* Check for invalid length PMTU or posted rwqe len. */
|
|
if (unlikely(tlen != (hdrsize + pmtu + 4)))
|
|
goto nack_inv;
|
|
qp->r_rcv_len += pmtu;
|
|
if (unlikely(qp->r_rcv_len > qp->r_len))
|
|
goto nack_inv;
|
|
rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false);
|
|
break;
|
|
|
|
case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
|
|
/* consume RWQE */
|
|
ret = rvt_get_rwqe(qp, true);
|
|
if (ret < 0)
|
|
goto nack_op_err;
|
|
if (!ret)
|
|
goto rnr_nak;
|
|
goto send_last_imm;
|
|
|
|
case OP(SEND_ONLY):
|
|
case OP(SEND_ONLY_WITH_IMMEDIATE):
|
|
ret = rvt_get_rwqe(qp, false);
|
|
if (ret < 0)
|
|
goto nack_op_err;
|
|
if (!ret)
|
|
goto rnr_nak;
|
|
qp->r_rcv_len = 0;
|
|
if (opcode == OP(SEND_ONLY))
|
|
goto no_immediate_data;
|
|
fallthrough; /* for SEND_ONLY_WITH_IMMEDIATE */
|
|
case OP(SEND_LAST_WITH_IMMEDIATE):
|
|
send_last_imm:
|
|
wc.ex.imm_data = ohdr->u.imm_data;
|
|
hdrsize += 4;
|
|
wc.wc_flags = IB_WC_WITH_IMM;
|
|
goto send_last;
|
|
case OP(SEND_LAST):
|
|
case OP(RDMA_WRITE_LAST):
|
|
no_immediate_data:
|
|
wc.wc_flags = 0;
|
|
wc.ex.imm_data = 0;
|
|
send_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 nack_inv;
|
|
/* Don't count the CRC. */
|
|
tlen -= (hdrsize + pad + 4);
|
|
wc.byte_len = tlen + qp->r_rcv_len;
|
|
if (unlikely(wc.byte_len > qp->r_len))
|
|
goto nack_inv;
|
|
rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
|
|
rvt_put_ss(&qp->r_sge);
|
|
qp->r_msn++;
|
|
if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
|
|
break;
|
|
wc.wr_id = qp->r_wr_id;
|
|
wc.status = IB_WC_SUCCESS;
|
|
if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) ||
|
|
opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
|
|
wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
|
|
else
|
|
wc.opcode = IB_WC_RECV;
|
|
wc.qp = &qp->ibqp;
|
|
wc.src_qp = qp->remote_qpn;
|
|
wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr);
|
|
wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
|
|
/* zero fields that are N/A */
|
|
wc.vendor_err = 0;
|
|
wc.pkey_index = 0;
|
|
wc.dlid_path_bits = 0;
|
|
wc.port_num = 0;
|
|
/* Signal completion event if the solicited bit is set. */
|
|
rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
|
|
break;
|
|
|
|
case OP(RDMA_WRITE_FIRST):
|
|
case OP(RDMA_WRITE_ONLY):
|
|
case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
|
|
if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
|
|
goto nack_inv;
|
|
/* consume RWQE */
|
|
reth = &ohdr->u.rc.reth;
|
|
hdrsize += sizeof(*reth);
|
|
qp->r_len = be32_to_cpu(reth->length);
|
|
qp->r_rcv_len = 0;
|
|
qp->r_sge.sg_list = NULL;
|
|
if (qp->r_len != 0) {
|
|
u32 rkey = be32_to_cpu(reth->rkey);
|
|
u64 vaddr = be64_to_cpu(reth->vaddr);
|
|
int ok;
|
|
|
|
/* Check rkey & NAK */
|
|
ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr,
|
|
rkey, IB_ACCESS_REMOTE_WRITE);
|
|
if (unlikely(!ok))
|
|
goto nack_acc;
|
|
qp->r_sge.num_sge = 1;
|
|
} else {
|
|
qp->r_sge.num_sge = 0;
|
|
qp->r_sge.sge.mr = NULL;
|
|
qp->r_sge.sge.vaddr = NULL;
|
|
qp->r_sge.sge.length = 0;
|
|
qp->r_sge.sge.sge_length = 0;
|
|
}
|
|
if (opcode == OP(RDMA_WRITE_FIRST))
|
|
goto send_middle;
|
|
else if (opcode == OP(RDMA_WRITE_ONLY))
|
|
goto no_immediate_data;
|
|
ret = rvt_get_rwqe(qp, true);
|
|
if (ret < 0)
|
|
goto nack_op_err;
|
|
if (!ret) {
|
|
rvt_put_ss(&qp->r_sge);
|
|
goto rnr_nak;
|
|
}
|
|
wc.ex.imm_data = ohdr->u.rc.imm_data;
|
|
hdrsize += 4;
|
|
wc.wc_flags = IB_WC_WITH_IMM;
|
|
goto send_last;
|
|
|
|
case OP(RDMA_READ_REQUEST): {
|
|
struct rvt_ack_entry *e;
|
|
u32 len;
|
|
u8 next;
|
|
|
|
if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ)))
|
|
goto nack_inv;
|
|
next = qp->r_head_ack_queue + 1;
|
|
/* s_ack_queue is size QIB_MAX_RDMA_ATOMIC+1 so use > not >= */
|
|
if (next > QIB_MAX_RDMA_ATOMIC)
|
|
next = 0;
|
|
spin_lock_irqsave(&qp->s_lock, flags);
|
|
if (unlikely(next == qp->s_tail_ack_queue)) {
|
|
if (!qp->s_ack_queue[next].sent)
|
|
goto nack_inv_unlck;
|
|
qib_update_ack_queue(qp, next);
|
|
}
|
|
e = &qp->s_ack_queue[qp->r_head_ack_queue];
|
|
if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) {
|
|
rvt_put_mr(e->rdma_sge.mr);
|
|
e->rdma_sge.mr = NULL;
|
|
}
|
|
reth = &ohdr->u.rc.reth;
|
|
len = be32_to_cpu(reth->length);
|
|
if (len) {
|
|
u32 rkey = be32_to_cpu(reth->rkey);
|
|
u64 vaddr = be64_to_cpu(reth->vaddr);
|
|
int ok;
|
|
|
|
/* Check rkey & NAK */
|
|
ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr,
|
|
rkey, IB_ACCESS_REMOTE_READ);
|
|
if (unlikely(!ok))
|
|
goto nack_acc_unlck;
|
|
/*
|
|
* Update the next expected PSN. We add 1 later
|
|
* below, so only add the remainder here.
|
|
*/
|
|
qp->r_psn += rvt_div_mtu(qp, len - 1);
|
|
} else {
|
|
e->rdma_sge.mr = NULL;
|
|
e->rdma_sge.vaddr = NULL;
|
|
e->rdma_sge.length = 0;
|
|
e->rdma_sge.sge_length = 0;
|
|
}
|
|
e->opcode = opcode;
|
|
e->sent = 0;
|
|
e->psn = psn;
|
|
e->lpsn = qp->r_psn;
|
|
/*
|
|
* We need to increment the MSN here instead of when we
|
|
* finish sending the result since a duplicate request would
|
|
* increment it more than once.
|
|
*/
|
|
qp->r_msn++;
|
|
qp->r_psn++;
|
|
qp->r_state = opcode;
|
|
qp->r_nak_state = 0;
|
|
qp->r_head_ack_queue = next;
|
|
|
|
/* Schedule the send tasklet. */
|
|
qp->s_flags |= RVT_S_RESP_PENDING;
|
|
qib_schedule_send(qp);
|
|
|
|
goto sunlock;
|
|
}
|
|
|
|
case OP(COMPARE_SWAP):
|
|
case OP(FETCH_ADD): {
|
|
struct ib_atomic_eth *ateth;
|
|
struct rvt_ack_entry *e;
|
|
u64 vaddr;
|
|
atomic64_t *maddr;
|
|
u64 sdata;
|
|
u32 rkey;
|
|
u8 next;
|
|
|
|
if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC)))
|
|
goto nack_inv;
|
|
next = qp->r_head_ack_queue + 1;
|
|
if (next > QIB_MAX_RDMA_ATOMIC)
|
|
next = 0;
|
|
spin_lock_irqsave(&qp->s_lock, flags);
|
|
if (unlikely(next == qp->s_tail_ack_queue)) {
|
|
if (!qp->s_ack_queue[next].sent)
|
|
goto nack_inv_unlck;
|
|
qib_update_ack_queue(qp, next);
|
|
}
|
|
e = &qp->s_ack_queue[qp->r_head_ack_queue];
|
|
if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) {
|
|
rvt_put_mr(e->rdma_sge.mr);
|
|
e->rdma_sge.mr = NULL;
|
|
}
|
|
ateth = &ohdr->u.atomic_eth;
|
|
vaddr = get_ib_ateth_vaddr(ateth);
|
|
if (unlikely(vaddr & (sizeof(u64) - 1)))
|
|
goto nack_inv_unlck;
|
|
rkey = be32_to_cpu(ateth->rkey);
|
|
/* Check rkey & NAK */
|
|
if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64),
|
|
vaddr, rkey,
|
|
IB_ACCESS_REMOTE_ATOMIC)))
|
|
goto nack_acc_unlck;
|
|
/* Perform atomic OP and save result. */
|
|
maddr = (atomic64_t *) qp->r_sge.sge.vaddr;
|
|
sdata = get_ib_ateth_swap(ateth);
|
|
e->atomic_data = (opcode == OP(FETCH_ADD)) ?
|
|
(u64) atomic64_add_return(sdata, maddr) - sdata :
|
|
(u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr,
|
|
get_ib_ateth_compare(ateth),
|
|
sdata);
|
|
rvt_put_mr(qp->r_sge.sge.mr);
|
|
qp->r_sge.num_sge = 0;
|
|
e->opcode = opcode;
|
|
e->sent = 0;
|
|
e->psn = psn;
|
|
e->lpsn = psn;
|
|
qp->r_msn++;
|
|
qp->r_psn++;
|
|
qp->r_state = opcode;
|
|
qp->r_nak_state = 0;
|
|
qp->r_head_ack_queue = next;
|
|
|
|
/* Schedule the send tasklet. */
|
|
qp->s_flags |= RVT_S_RESP_PENDING;
|
|
qib_schedule_send(qp);
|
|
|
|
goto sunlock;
|
|
}
|
|
|
|
default:
|
|
/* NAK unknown opcodes. */
|
|
goto nack_inv;
|
|
}
|
|
qp->r_psn++;
|
|
qp->r_state = opcode;
|
|
qp->r_ack_psn = psn;
|
|
qp->r_nak_state = 0;
|
|
/* Send an ACK if requested or required. */
|
|
if (psn & (1 << 31))
|
|
goto send_ack;
|
|
return;
|
|
|
|
rnr_nak:
|
|
qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer;
|
|
qp->r_ack_psn = qp->r_psn;
|
|
/* Queue RNR NAK for later */
|
|
if (list_empty(&qp->rspwait)) {
|
|
qp->r_flags |= RVT_R_RSP_NAK;
|
|
rvt_get_qp(qp);
|
|
list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
|
|
}
|
|
return;
|
|
|
|
nack_op_err:
|
|
rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
|
|
qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR;
|
|
qp->r_ack_psn = qp->r_psn;
|
|
/* Queue NAK for later */
|
|
if (list_empty(&qp->rspwait)) {
|
|
qp->r_flags |= RVT_R_RSP_NAK;
|
|
rvt_get_qp(qp);
|
|
list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
|
|
}
|
|
return;
|
|
|
|
nack_inv_unlck:
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
nack_inv:
|
|
rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
|
|
qp->r_nak_state = IB_NAK_INVALID_REQUEST;
|
|
qp->r_ack_psn = qp->r_psn;
|
|
/* Queue NAK for later */
|
|
if (list_empty(&qp->rspwait)) {
|
|
qp->r_flags |= RVT_R_RSP_NAK;
|
|
rvt_get_qp(qp);
|
|
list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
|
|
}
|
|
return;
|
|
|
|
nack_acc_unlck:
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
nack_acc:
|
|
rvt_rc_error(qp, IB_WC_LOC_PROT_ERR);
|
|
qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR;
|
|
qp->r_ack_psn = qp->r_psn;
|
|
send_ack:
|
|
qib_send_rc_ack(qp);
|
|
return;
|
|
|
|
sunlock:
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
}
|