735 lines
19 KiB
C
735 lines
19 KiB
C
/*
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* Copyright (c) 2006 QLogic, Inc. 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 "ipath_verbs.h"
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#include "ipath_kernel.h"
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/*
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* Convert the AETH RNR timeout code into the number of milliseconds.
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*/
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const u32 ib_ipath_rnr_table[32] = {
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656, /* 0 */
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1, /* 1 */
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1, /* 2 */
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1, /* 3 */
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1, /* 4 */
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1, /* 5 */
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1, /* 6 */
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1, /* 7 */
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1, /* 8 */
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1, /* 9 */
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1, /* A */
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1, /* B */
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1, /* C */
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1, /* D */
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2, /* E */
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2, /* F */
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3, /* 10 */
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4, /* 11 */
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6, /* 12 */
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8, /* 13 */
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11, /* 14 */
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16, /* 15 */
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21, /* 16 */
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31, /* 17 */
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41, /* 18 */
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62, /* 19 */
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82, /* 1A */
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123, /* 1B */
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164, /* 1C */
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246, /* 1D */
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328, /* 1E */
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492 /* 1F */
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};
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/**
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* ipath_insert_rnr_queue - put QP on the RNR timeout list for the device
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* @qp: the QP
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*
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* XXX Use a simple list for now. We might need a priority
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* queue if we have lots of QPs waiting for RNR timeouts
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* but that should be rare.
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*/
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void ipath_insert_rnr_queue(struct ipath_qp *qp)
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{
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struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
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unsigned long flags;
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spin_lock_irqsave(&dev->pending_lock, flags);
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if (list_empty(&dev->rnrwait))
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list_add(&qp->timerwait, &dev->rnrwait);
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else {
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struct list_head *l = &dev->rnrwait;
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struct ipath_qp *nqp = list_entry(l->next, struct ipath_qp,
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timerwait);
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while (qp->s_rnr_timeout >= nqp->s_rnr_timeout) {
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qp->s_rnr_timeout -= nqp->s_rnr_timeout;
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l = l->next;
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if (l->next == &dev->rnrwait)
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break;
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nqp = list_entry(l->next, struct ipath_qp,
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timerwait);
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}
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list_add(&qp->timerwait, l);
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}
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spin_unlock_irqrestore(&dev->pending_lock, flags);
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}
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static int init_sge(struct ipath_qp *qp, struct ipath_rwqe *wqe)
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{
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int user = to_ipd(qp->ibqp.pd)->user;
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int i, j, ret;
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struct ib_wc wc;
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qp->r_len = 0;
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for (i = j = 0; i < wqe->num_sge; i++) {
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if (wqe->sg_list[i].length == 0)
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continue;
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/* Check LKEY */
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if ((user && wqe->sg_list[i].lkey == 0) ||
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!ipath_lkey_ok(qp, &qp->r_sg_list[j], &wqe->sg_list[i],
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IB_ACCESS_LOCAL_WRITE))
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goto bad_lkey;
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qp->r_len += wqe->sg_list[i].length;
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j++;
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}
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qp->r_sge.sge = qp->r_sg_list[0];
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qp->r_sge.sg_list = qp->r_sg_list + 1;
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qp->r_sge.num_sge = j;
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ret = 1;
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goto bail;
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bad_lkey:
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wc.wr_id = wqe->wr_id;
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wc.status = IB_WC_LOC_PROT_ERR;
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wc.opcode = IB_WC_RECV;
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wc.vendor_err = 0;
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wc.byte_len = 0;
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wc.imm_data = 0;
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wc.qp_num = qp->ibqp.qp_num;
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wc.src_qp = 0;
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wc.wc_flags = 0;
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wc.pkey_index = 0;
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wc.slid = 0;
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wc.sl = 0;
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wc.dlid_path_bits = 0;
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wc.port_num = 0;
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/* Signal solicited completion event. */
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ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
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ret = 0;
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bail:
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return ret;
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}
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/**
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* ipath_get_rwqe - copy the next RWQE into the QP's RWQE
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* @qp: the QP
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* @wr_id_only: update wr_id only, not SGEs
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*
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* Return 0 if no RWQE is available, otherwise return 1.
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*
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* Can be called from interrupt level.
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*/
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int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only)
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{
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unsigned long flags;
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struct ipath_rq *rq;
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struct ipath_rwq *wq;
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struct ipath_srq *srq;
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struct ipath_rwqe *wqe;
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void (*handler)(struct ib_event *, void *);
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u32 tail;
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int ret;
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if (qp->ibqp.srq) {
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srq = to_isrq(qp->ibqp.srq);
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handler = srq->ibsrq.event_handler;
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rq = &srq->rq;
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} else {
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srq = NULL;
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handler = NULL;
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rq = &qp->r_rq;
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}
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spin_lock_irqsave(&rq->lock, flags);
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wq = rq->wq;
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tail = wq->tail;
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/* Validate tail before using it since it is user writable. */
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if (tail >= rq->size)
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tail = 0;
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do {
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if (unlikely(tail == wq->head)) {
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spin_unlock_irqrestore(&rq->lock, flags);
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ret = 0;
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goto bail;
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}
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wqe = get_rwqe_ptr(rq, tail);
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if (++tail >= rq->size)
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tail = 0;
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} while (!wr_id_only && !init_sge(qp, wqe));
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qp->r_wr_id = wqe->wr_id;
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wq->tail = tail;
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ret = 1;
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if (handler) {
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u32 n;
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/*
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* validate head pointer value and compute
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* the number of remaining WQEs.
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*/
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n = wq->head;
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if (n >= rq->size)
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n = 0;
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if (n < tail)
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n += rq->size - tail;
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else
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n -= tail;
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if (n < srq->limit) {
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struct ib_event ev;
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srq->limit = 0;
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spin_unlock_irqrestore(&rq->lock, flags);
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ev.device = qp->ibqp.device;
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ev.element.srq = qp->ibqp.srq;
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ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
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handler(&ev, srq->ibsrq.srq_context);
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goto bail;
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}
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}
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spin_unlock_irqrestore(&rq->lock, flags);
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qp->r_wrid_valid = 1;
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bail:
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return ret;
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}
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/**
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* ipath_ruc_loopback - handle UC and RC lookback requests
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* @sqp: the loopback QP
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*
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* This is called from ipath_do_uc_send() or ipath_do_rc_send() to
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* forward a WQE addressed to the same HCA.
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* Note that although we are single threaded due to the tasklet, we still
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* have to protect against post_send(). We don't have to worry about
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* receive interrupts since this is a connected protocol and all packets
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* will pass through here.
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*/
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static void ipath_ruc_loopback(struct ipath_qp *sqp)
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{
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struct ipath_ibdev *dev = to_idev(sqp->ibqp.device);
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struct ipath_qp *qp;
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struct ipath_swqe *wqe;
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struct ipath_sge *sge;
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unsigned long flags;
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struct ib_wc wc;
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u64 sdata;
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qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn);
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if (!qp) {
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dev->n_pkt_drops++;
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return;
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}
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again:
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spin_lock_irqsave(&sqp->s_lock, flags);
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if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_SEND_OK)) {
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spin_unlock_irqrestore(&sqp->s_lock, flags);
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goto done;
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}
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/* Get the next send request. */
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if (sqp->s_last == sqp->s_head) {
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/* Send work queue is empty. */
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spin_unlock_irqrestore(&sqp->s_lock, flags);
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goto done;
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}
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/*
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* We can rely on the entry not changing without the s_lock
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* being held until we update s_last.
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*/
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wqe = get_swqe_ptr(sqp, sqp->s_last);
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spin_unlock_irqrestore(&sqp->s_lock, flags);
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wc.wc_flags = 0;
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wc.imm_data = 0;
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sqp->s_sge.sge = wqe->sg_list[0];
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sqp->s_sge.sg_list = wqe->sg_list + 1;
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sqp->s_sge.num_sge = wqe->wr.num_sge;
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sqp->s_len = wqe->length;
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switch (wqe->wr.opcode) {
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case IB_WR_SEND_WITH_IMM:
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wc.wc_flags = IB_WC_WITH_IMM;
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wc.imm_data = wqe->wr.imm_data;
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/* FALLTHROUGH */
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case IB_WR_SEND:
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if (!ipath_get_rwqe(qp, 0)) {
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rnr_nak:
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/* Handle RNR NAK */
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if (qp->ibqp.qp_type == IB_QPT_UC)
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goto send_comp;
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if (sqp->s_rnr_retry == 0) {
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wc.status = IB_WC_RNR_RETRY_EXC_ERR;
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goto err;
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}
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if (sqp->s_rnr_retry_cnt < 7)
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sqp->s_rnr_retry--;
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dev->n_rnr_naks++;
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sqp->s_rnr_timeout =
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ib_ipath_rnr_table[sqp->r_min_rnr_timer];
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ipath_insert_rnr_queue(sqp);
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goto done;
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}
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break;
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case IB_WR_RDMA_WRITE_WITH_IMM:
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wc.wc_flags = IB_WC_WITH_IMM;
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wc.imm_data = wqe->wr.imm_data;
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if (!ipath_get_rwqe(qp, 1))
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goto rnr_nak;
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/* FALLTHROUGH */
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case IB_WR_RDMA_WRITE:
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if (wqe->length == 0)
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break;
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if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, wqe->length,
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wqe->wr.wr.rdma.remote_addr,
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wqe->wr.wr.rdma.rkey,
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IB_ACCESS_REMOTE_WRITE))) {
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acc_err:
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wc.status = IB_WC_REM_ACCESS_ERR;
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err:
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wc.wr_id = wqe->wr.wr_id;
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wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
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wc.vendor_err = 0;
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wc.byte_len = 0;
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wc.qp_num = sqp->ibqp.qp_num;
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wc.src_qp = sqp->remote_qpn;
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wc.pkey_index = 0;
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wc.slid = sqp->remote_ah_attr.dlid;
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wc.sl = sqp->remote_ah_attr.sl;
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wc.dlid_path_bits = 0;
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wc.port_num = 0;
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ipath_sqerror_qp(sqp, &wc);
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goto done;
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}
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break;
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case IB_WR_RDMA_READ:
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if (unlikely(!ipath_rkey_ok(qp, &sqp->s_sge, wqe->length,
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wqe->wr.wr.rdma.remote_addr,
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wqe->wr.wr.rdma.rkey,
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IB_ACCESS_REMOTE_READ)))
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goto acc_err;
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if (unlikely(!(qp->qp_access_flags &
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IB_ACCESS_REMOTE_READ)))
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goto acc_err;
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qp->r_sge.sge = wqe->sg_list[0];
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qp->r_sge.sg_list = wqe->sg_list + 1;
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qp->r_sge.num_sge = wqe->wr.num_sge;
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break;
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case IB_WR_ATOMIC_CMP_AND_SWP:
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case IB_WR_ATOMIC_FETCH_AND_ADD:
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if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, sizeof(u64),
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wqe->wr.wr.rdma.remote_addr,
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wqe->wr.wr.rdma.rkey,
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IB_ACCESS_REMOTE_ATOMIC)))
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goto acc_err;
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/* Perform atomic OP and save result. */
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sdata = wqe->wr.wr.atomic.swap;
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spin_lock_irqsave(&dev->pending_lock, flags);
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qp->r_atomic_data = *(u64 *) qp->r_sge.sge.vaddr;
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if (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)
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*(u64 *) qp->r_sge.sge.vaddr =
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qp->r_atomic_data + sdata;
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else if (qp->r_atomic_data == wqe->wr.wr.atomic.compare_add)
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*(u64 *) qp->r_sge.sge.vaddr = sdata;
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spin_unlock_irqrestore(&dev->pending_lock, flags);
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*(u64 *) sqp->s_sge.sge.vaddr = qp->r_atomic_data;
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goto send_comp;
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default:
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goto done;
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}
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sge = &sqp->s_sge.sge;
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while (sqp->s_len) {
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u32 len = sqp->s_len;
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if (len > sge->length)
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len = sge->length;
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BUG_ON(len == 0);
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ipath_copy_sge(&qp->r_sge, sge->vaddr, len);
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sge->vaddr += len;
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sge->length -= len;
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sge->sge_length -= len;
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if (sge->sge_length == 0) {
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if (--sqp->s_sge.num_sge)
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*sge = *sqp->s_sge.sg_list++;
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} else if (sge->length == 0 && sge->mr != NULL) {
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if (++sge->n >= IPATH_SEGSZ) {
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if (++sge->m >= sge->mr->mapsz)
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break;
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sge->n = 0;
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}
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sge->vaddr =
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sge->mr->map[sge->m]->segs[sge->n].vaddr;
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sge->length =
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sge->mr->map[sge->m]->segs[sge->n].length;
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}
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sqp->s_len -= len;
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}
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if (wqe->wr.opcode == IB_WR_RDMA_WRITE ||
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wqe->wr.opcode == IB_WR_RDMA_READ)
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goto send_comp;
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if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM)
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wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
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else
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wc.opcode = IB_WC_RECV;
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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.vendor_err = 0;
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wc.byte_len = wqe->length;
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wc.qp_num = qp->ibqp.qp_num;
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wc.src_qp = qp->remote_qpn;
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/* XXX do we know which pkey matched? Only needed for GSI. */
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wc.pkey_index = 0;
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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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wc.dlid_path_bits = 0;
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/* Signal completion event if the solicited bit is set. */
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ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
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wqe->wr.send_flags & IB_SEND_SOLICITED);
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send_comp:
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sqp->s_rnr_retry = sqp->s_rnr_retry_cnt;
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if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &sqp->s_flags) ||
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(wqe->wr.send_flags & IB_SEND_SIGNALED)) {
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wc.wr_id = wqe->wr.wr_id;
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wc.status = IB_WC_SUCCESS;
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wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
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wc.vendor_err = 0;
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wc.byte_len = wqe->length;
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wc.qp_num = sqp->ibqp.qp_num;
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wc.src_qp = 0;
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wc.pkey_index = 0;
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wc.slid = 0;
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wc.sl = 0;
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wc.dlid_path_bits = 0;
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wc.port_num = 0;
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ipath_cq_enter(to_icq(sqp->ibqp.send_cq), &wc, 0);
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}
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/* Update s_last now that we are finished with the SWQE */
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spin_lock_irqsave(&sqp->s_lock, flags);
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if (++sqp->s_last >= sqp->s_size)
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sqp->s_last = 0;
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spin_unlock_irqrestore(&sqp->s_lock, flags);
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goto again;
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done:
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if (atomic_dec_and_test(&qp->refcount))
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wake_up(&qp->wait);
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}
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|
|
static int want_buffer(struct ipath_devdata *dd)
|
|
{
|
|
set_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);
|
|
ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
|
|
dd->ipath_sendctrl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ipath_no_bufs_available - tell the layer driver we need buffers
|
|
* @qp: the QP that caused the problem
|
|
* @dev: the device we ran out of buffers on
|
|
*
|
|
* Called when we run out of PIO buffers.
|
|
*/
|
|
void ipath_no_bufs_available(struct ipath_qp *qp, struct ipath_ibdev *dev)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dev->pending_lock, flags);
|
|
if (list_empty(&qp->piowait))
|
|
list_add_tail(&qp->piowait, &dev->piowait);
|
|
spin_unlock_irqrestore(&dev->pending_lock, flags);
|
|
/*
|
|
* Note that as soon as want_buffer() is called and
|
|
* possibly before it returns, ipath_ib_piobufavail()
|
|
* could be called. If we are still in the tasklet function,
|
|
* tasklet_hi_schedule() will not call us until the next time
|
|
* tasklet_hi_schedule() is called.
|
|
* We clear the tasklet flag now since we are committing to return
|
|
* from the tasklet function.
|
|
*/
|
|
clear_bit(IPATH_S_BUSY, &qp->s_flags);
|
|
tasklet_unlock(&qp->s_task);
|
|
want_buffer(dev->dd);
|
|
dev->n_piowait++;
|
|
}
|
|
|
|
/**
|
|
* ipath_post_ruc_send - post RC and UC sends
|
|
* @qp: the QP to post on
|
|
* @wr: the work request to send
|
|
*/
|
|
int ipath_post_ruc_send(struct ipath_qp *qp, struct ib_send_wr *wr)
|
|
{
|
|
struct ipath_swqe *wqe;
|
|
unsigned long flags;
|
|
u32 next;
|
|
int i, j;
|
|
int acc;
|
|
int ret;
|
|
|
|
/*
|
|
* Don't allow RDMA reads or atomic operations on UC or
|
|
* undefined operations.
|
|
* Make sure buffer is large enough to hold the result for atomics.
|
|
*/
|
|
if (qp->ibqp.qp_type == IB_QPT_UC) {
|
|
if ((unsigned) wr->opcode >= IB_WR_RDMA_READ) {
|
|
ret = -EINVAL;
|
|
goto bail;
|
|
}
|
|
} else if ((unsigned) wr->opcode > IB_WR_ATOMIC_FETCH_AND_ADD) {
|
|
ret = -EINVAL;
|
|
goto bail;
|
|
} else if (wr->opcode >= IB_WR_ATOMIC_CMP_AND_SWP &&
|
|
(wr->num_sge == 0 ||
|
|
wr->sg_list[0].length < sizeof(u64) ||
|
|
wr->sg_list[0].addr & (sizeof(u64) - 1))) {
|
|
ret = -EINVAL;
|
|
goto bail;
|
|
}
|
|
/* IB spec says that num_sge == 0 is OK. */
|
|
if (wr->num_sge > qp->s_max_sge) {
|
|
ret = -ENOMEM;
|
|
goto bail;
|
|
}
|
|
spin_lock_irqsave(&qp->s_lock, flags);
|
|
next = qp->s_head + 1;
|
|
if (next >= qp->s_size)
|
|
next = 0;
|
|
if (next == qp->s_last) {
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
ret = -EINVAL;
|
|
goto bail;
|
|
}
|
|
|
|
wqe = get_swqe_ptr(qp, qp->s_head);
|
|
wqe->wr = *wr;
|
|
wqe->ssn = qp->s_ssn++;
|
|
wqe->sg_list[0].mr = NULL;
|
|
wqe->sg_list[0].vaddr = NULL;
|
|
wqe->sg_list[0].length = 0;
|
|
wqe->sg_list[0].sge_length = 0;
|
|
wqe->length = 0;
|
|
acc = wr->opcode >= IB_WR_RDMA_READ ? IB_ACCESS_LOCAL_WRITE : 0;
|
|
for (i = 0, j = 0; i < wr->num_sge; i++) {
|
|
if (to_ipd(qp->ibqp.pd)->user && wr->sg_list[i].lkey == 0) {
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
ret = -EINVAL;
|
|
goto bail;
|
|
}
|
|
if (wr->sg_list[i].length == 0)
|
|
continue;
|
|
if (!ipath_lkey_ok(qp, &wqe->sg_list[j], &wr->sg_list[i],
|
|
acc)) {
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
ret = -EINVAL;
|
|
goto bail;
|
|
}
|
|
wqe->length += wr->sg_list[i].length;
|
|
j++;
|
|
}
|
|
wqe->wr.num_sge = j;
|
|
qp->s_head = next;
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
|
|
ipath_do_ruc_send((unsigned long) qp);
|
|
|
|
ret = 0;
|
|
|
|
bail:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ipath_make_grh - construct a GRH header
|
|
* @dev: a pointer to the ipath device
|
|
* @hdr: a pointer to the GRH header being constructed
|
|
* @grh: the global route address to send to
|
|
* @hwords: the number of 32 bit words of header being sent
|
|
* @nwords: the number of 32 bit words of data being sent
|
|
*
|
|
* Return the size of the header in 32 bit words.
|
|
*/
|
|
u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr,
|
|
struct ib_global_route *grh, u32 hwords, u32 nwords)
|
|
{
|
|
hdr->version_tclass_flow =
|
|
cpu_to_be32((6 << 28) |
|
|
(grh->traffic_class << 20) |
|
|
grh->flow_label);
|
|
hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2);
|
|
/* next_hdr is defined by C8-7 in ch. 8.4.1 */
|
|
hdr->next_hdr = 0x1B;
|
|
hdr->hop_limit = grh->hop_limit;
|
|
/* The SGID is 32-bit aligned. */
|
|
hdr->sgid.global.subnet_prefix = dev->gid_prefix;
|
|
hdr->sgid.global.interface_id = dev->dd->ipath_guid;
|
|
hdr->dgid = grh->dgid;
|
|
|
|
/* GRH header size in 32-bit words. */
|
|
return sizeof(struct ib_grh) / sizeof(u32);
|
|
}
|
|
|
|
/**
|
|
* ipath_do_ruc_send - perform a send on an RC or UC QP
|
|
* @data: contains a pointer to the QP
|
|
*
|
|
* Process entries in the send work queue until credit or queue is
|
|
* exhausted. Only allow one CPU to send a packet per QP (tasklet).
|
|
* Otherwise, after we drop the QP s_lock, two threads could send
|
|
* packets out of order.
|
|
*/
|
|
void ipath_do_ruc_send(unsigned long data)
|
|
{
|
|
struct ipath_qp *qp = (struct ipath_qp *)data;
|
|
struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
|
|
unsigned long flags;
|
|
u16 lrh0;
|
|
u32 nwords;
|
|
u32 extra_bytes;
|
|
u32 bth0;
|
|
u32 bth2;
|
|
u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
|
|
struct ipath_other_headers *ohdr;
|
|
|
|
if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags))
|
|
goto bail;
|
|
|
|
if (unlikely(qp->remote_ah_attr.dlid == dev->dd->ipath_lid)) {
|
|
ipath_ruc_loopback(qp);
|
|
goto clear;
|
|
}
|
|
|
|
ohdr = &qp->s_hdr.u.oth;
|
|
if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
|
|
ohdr = &qp->s_hdr.u.l.oth;
|
|
|
|
again:
|
|
/* Check for a constructed packet to be sent. */
|
|
if (qp->s_hdrwords != 0) {
|
|
/*
|
|
* If no PIO bufs are available, return. An interrupt will
|
|
* call ipath_ib_piobufavail() when one is available.
|
|
*/
|
|
if (ipath_verbs_send(dev->dd, qp->s_hdrwords,
|
|
(u32 *) &qp->s_hdr, qp->s_cur_size,
|
|
qp->s_cur_sge)) {
|
|
ipath_no_bufs_available(qp, dev);
|
|
goto bail;
|
|
}
|
|
dev->n_unicast_xmit++;
|
|
/* Record that we sent the packet and s_hdr is empty. */
|
|
qp->s_hdrwords = 0;
|
|
}
|
|
|
|
/*
|
|
* The lock is needed to synchronize between setting
|
|
* qp->s_ack_state, resend timer, and post_send().
|
|
*/
|
|
spin_lock_irqsave(&qp->s_lock, flags);
|
|
|
|
/* Sending responses has higher priority over sending requests. */
|
|
if (qp->s_ack_state != IB_OPCODE_RC_ACKNOWLEDGE &&
|
|
(bth0 = ipath_make_rc_ack(qp, ohdr, pmtu)) != 0)
|
|
bth2 = qp->s_ack_psn++ & IPATH_PSN_MASK;
|
|
else if (!((qp->ibqp.qp_type == IB_QPT_RC) ?
|
|
ipath_make_rc_req(qp, ohdr, pmtu, &bth0, &bth2) :
|
|
ipath_make_uc_req(qp, ohdr, pmtu, &bth0, &bth2))) {
|
|
/*
|
|
* Clear the busy bit before unlocking to avoid races with
|
|
* adding new work queue items and then failing to process
|
|
* them.
|
|
*/
|
|
clear_bit(IPATH_S_BUSY, &qp->s_flags);
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
goto bail;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
|
|
/* Construct the header. */
|
|
extra_bytes = (4 - qp->s_cur_size) & 3;
|
|
nwords = (qp->s_cur_size + extra_bytes) >> 2;
|
|
lrh0 = IPATH_LRH_BTH;
|
|
if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
|
|
qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh,
|
|
&qp->remote_ah_attr.grh,
|
|
qp->s_hdrwords, nwords);
|
|
lrh0 = IPATH_LRH_GRH;
|
|
}
|
|
lrh0 |= qp->remote_ah_attr.sl << 4;
|
|
qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
|
|
qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
|
|
qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords +
|
|
SIZE_OF_CRC);
|
|
qp->s_hdr.lrh[3] = cpu_to_be16(dev->dd->ipath_lid);
|
|
bth0 |= ipath_get_pkey(dev->dd, qp->s_pkey_index);
|
|
bth0 |= extra_bytes << 20;
|
|
ohdr->bth[0] = cpu_to_be32(bth0);
|
|
ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
|
|
ohdr->bth[2] = cpu_to_be32(bth2);
|
|
|
|
/* Check for more work to do. */
|
|
goto again;
|
|
|
|
clear:
|
|
clear_bit(IPATH_S_BUSY, &qp->s_flags);
|
|
bail:
|
|
return;
|
|
}
|