584 lines
16 KiB
C
584 lines
16 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 <rdma/ib_smi.h>
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#include "qib.h"
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#include "qib_mad.h"
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/**
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* qib_ud_loopback - handle send on loopback QPs
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* @sqp: the sending QP
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* @swqe: the send work request
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*
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* This is called from qib_make_ud_req() to forward a WQE addressed
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* to the same HCA.
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* Note that the receive interrupt handler may be calling qib_ud_rcv()
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* while this is being called.
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*/
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static void qib_ud_loopback(struct qib_qp *sqp, struct qib_swqe *swqe)
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{
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struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
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struct qib_pportdata *ppd;
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struct qib_qp *qp;
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struct ib_ah_attr *ah_attr;
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unsigned long flags;
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struct qib_sge_state ssge;
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struct qib_sge *sge;
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struct ib_wc wc;
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u32 length;
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qp = qib_lookup_qpn(ibp, swqe->wr.wr.ud.remote_qpn);
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if (!qp) {
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ibp->n_pkt_drops++;
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return;
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}
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if (qp->ibqp.qp_type != sqp->ibqp.qp_type ||
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!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) {
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ibp->n_pkt_drops++;
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goto drop;
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}
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ah_attr = &to_iah(swqe->wr.wr.ud.ah)->attr;
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ppd = ppd_from_ibp(ibp);
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if (qp->ibqp.qp_num > 1) {
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u16 pkey1;
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u16 pkey2;
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u16 lid;
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pkey1 = qib_get_pkey(ibp, sqp->s_pkey_index);
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pkey2 = qib_get_pkey(ibp, qp->s_pkey_index);
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if (unlikely(!qib_pkey_ok(pkey1, pkey2))) {
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lid = ppd->lid | (ah_attr->src_path_bits &
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((1 << ppd->lmc) - 1));
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qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, pkey1,
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ah_attr->sl,
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sqp->ibqp.qp_num, qp->ibqp.qp_num,
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cpu_to_be16(lid),
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cpu_to_be16(ah_attr->dlid));
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goto drop;
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}
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}
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/*
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* Check that the qkey matches (except for QP0, see 9.6.1.4.1).
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* Qkeys with the high order bit set mean use the
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* qkey from the QP context instead of the WR (see 10.2.5).
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*/
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if (qp->ibqp.qp_num) {
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u32 qkey;
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qkey = (int)swqe->wr.wr.ud.remote_qkey < 0 ?
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sqp->qkey : swqe->wr.wr.ud.remote_qkey;
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if (unlikely(qkey != qp->qkey)) {
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u16 lid;
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lid = ppd->lid | (ah_attr->src_path_bits &
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((1 << ppd->lmc) - 1));
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qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_QKEY, qkey,
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ah_attr->sl,
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sqp->ibqp.qp_num, qp->ibqp.qp_num,
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cpu_to_be16(lid),
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cpu_to_be16(ah_attr->dlid));
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goto drop;
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}
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}
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/*
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* A GRH is expected to precede the data even if not
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* present on the wire.
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*/
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length = swqe->length;
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memset(&wc, 0, sizeof wc);
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wc.byte_len = length + sizeof(struct ib_grh);
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if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
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wc.wc_flags = IB_WC_WITH_IMM;
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wc.ex.imm_data = swqe->wr.ex.imm_data;
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}
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spin_lock_irqsave(&qp->r_lock, flags);
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/*
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* Get the next work request entry to find where to put the data.
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*/
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if (qp->r_flags & QIB_R_REUSE_SGE)
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qp->r_flags &= ~QIB_R_REUSE_SGE;
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else {
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int ret;
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ret = qib_get_rwqe(qp, 0);
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if (ret < 0) {
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qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
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goto bail_unlock;
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}
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if (!ret) {
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if (qp->ibqp.qp_num == 0)
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ibp->n_vl15_dropped++;
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goto bail_unlock;
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}
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}
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/* Silently drop packets which are too big. */
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if (unlikely(wc.byte_len > qp->r_len)) {
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qp->r_flags |= QIB_R_REUSE_SGE;
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ibp->n_pkt_drops++;
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goto bail_unlock;
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}
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if (ah_attr->ah_flags & IB_AH_GRH) {
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qib_copy_sge(&qp->r_sge, &ah_attr->grh,
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sizeof(struct ib_grh), 1);
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wc.wc_flags |= IB_WC_GRH;
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} else
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qib_skip_sge(&qp->r_sge, sizeof(struct ib_grh), 1);
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ssge.sg_list = swqe->sg_list + 1;
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ssge.sge = *swqe->sg_list;
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ssge.num_sge = swqe->wr.num_sge;
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sge = &ssge.sge;
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while (length) {
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u32 len = sge->length;
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if (len > length)
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len = length;
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if (len > sge->sge_length)
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len = sge->sge_length;
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BUG_ON(len == 0);
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qib_copy_sge(&qp->r_sge, sge->vaddr, len, 1);
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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 (--ssge.num_sge)
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*sge = *ssge.sg_list++;
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} else if (sge->length == 0 && sge->mr->lkey) {
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if (++sge->n >= QIB_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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length -= len;
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}
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qib_put_ss(&qp->r_sge);
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if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags))
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goto bail_unlock;
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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.opcode = IB_WC_RECV;
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wc.qp = &qp->ibqp;
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wc.src_qp = sqp->ibqp.qp_num;
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wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ?
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swqe->wr.wr.ud.pkey_index : 0;
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wc.slid = ppd->lid | (ah_attr->src_path_bits & ((1 << ppd->lmc) - 1));
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wc.sl = ah_attr->sl;
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wc.dlid_path_bits = ah_attr->dlid & ((1 << ppd->lmc) - 1);
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wc.port_num = qp->port_num;
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/* Signal completion event if the solicited bit is set. */
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qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
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swqe->wr.send_flags & IB_SEND_SOLICITED);
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ibp->n_loop_pkts++;
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bail_unlock:
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spin_unlock_irqrestore(&qp->r_lock, flags);
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drop:
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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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/**
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* qib_make_ud_req - construct a UD request packet
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* @qp: the QP
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*
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* Return 1 if constructed; otherwise, return 0.
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*/
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int qib_make_ud_req(struct qib_qp *qp)
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{
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struct qib_other_headers *ohdr;
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struct ib_ah_attr *ah_attr;
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struct qib_pportdata *ppd;
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struct qib_ibport *ibp;
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struct qib_swqe *wqe;
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unsigned long flags;
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u32 nwords;
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u32 extra_bytes;
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u32 bth0;
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u16 lrh0;
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u16 lid;
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int ret = 0;
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int next_cur;
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spin_lock_irqsave(&qp->s_lock, flags);
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if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_NEXT_SEND_OK)) {
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if (!(ib_qib_state_ops[qp->state] & QIB_FLUSH_SEND))
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goto bail;
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/* We are in the error state, flush the work request. */
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if (qp->s_last == qp->s_head)
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goto bail;
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/* If DMAs are in progress, we can't flush immediately. */
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if (atomic_read(&qp->s_dma_busy)) {
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qp->s_flags |= QIB_S_WAIT_DMA;
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goto bail;
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}
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wqe = get_swqe_ptr(qp, qp->s_last);
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qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
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goto done;
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}
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if (qp->s_cur == qp->s_head)
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goto bail;
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wqe = get_swqe_ptr(qp, qp->s_cur);
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next_cur = qp->s_cur + 1;
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if (next_cur >= qp->s_size)
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next_cur = 0;
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/* Construct the header. */
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ibp = to_iport(qp->ibqp.device, qp->port_num);
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ppd = ppd_from_ibp(ibp);
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ah_attr = &to_iah(wqe->wr.wr.ud.ah)->attr;
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if (ah_attr->dlid >= QIB_MULTICAST_LID_BASE) {
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if (ah_attr->dlid != QIB_PERMISSIVE_LID)
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ibp->n_multicast_xmit++;
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else
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ibp->n_unicast_xmit++;
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} else {
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ibp->n_unicast_xmit++;
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lid = ah_attr->dlid & ~((1 << ppd->lmc) - 1);
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if (unlikely(lid == ppd->lid)) {
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/*
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* If DMAs are in progress, we can't generate
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* a completion for the loopback packet since
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* it would be out of order.
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* XXX Instead of waiting, we could queue a
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* zero length descriptor so we get a callback.
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*/
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if (atomic_read(&qp->s_dma_busy)) {
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qp->s_flags |= QIB_S_WAIT_DMA;
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goto bail;
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}
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qp->s_cur = next_cur;
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spin_unlock_irqrestore(&qp->s_lock, flags);
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qib_ud_loopback(qp, wqe);
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spin_lock_irqsave(&qp->s_lock, flags);
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qib_send_complete(qp, wqe, IB_WC_SUCCESS);
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goto done;
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}
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}
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qp->s_cur = next_cur;
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extra_bytes = -wqe->length & 3;
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nwords = (wqe->length + extra_bytes) >> 2;
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/* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */
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qp->s_hdrwords = 7;
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qp->s_cur_size = wqe->length;
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qp->s_cur_sge = &qp->s_sge;
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qp->s_srate = ah_attr->static_rate;
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qp->s_wqe = wqe;
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qp->s_sge.sge = wqe->sg_list[0];
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qp->s_sge.sg_list = wqe->sg_list + 1;
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qp->s_sge.num_sge = wqe->wr.num_sge;
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qp->s_sge.total_len = wqe->length;
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if (ah_attr->ah_flags & IB_AH_GRH) {
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/* Header size in 32-bit words. */
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qp->s_hdrwords += qib_make_grh(ibp, &qp->s_hdr->u.l.grh,
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&ah_attr->grh,
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qp->s_hdrwords, nwords);
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lrh0 = QIB_LRH_GRH;
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ohdr = &qp->s_hdr->u.l.oth;
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/*
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* Don't worry about sending to locally attached multicast
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* QPs. It is unspecified by the spec. what happens.
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*/
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} else {
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/* Header size in 32-bit words. */
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lrh0 = QIB_LRH_BTH;
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ohdr = &qp->s_hdr->u.oth;
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}
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if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
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qp->s_hdrwords++;
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ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
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bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
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} else
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bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
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lrh0 |= ah_attr->sl << 4;
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if (qp->ibqp.qp_type == IB_QPT_SMI)
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lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
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else
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lrh0 |= ibp->sl_to_vl[ah_attr->sl] << 12;
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qp->s_hdr->lrh[0] = cpu_to_be16(lrh0);
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qp->s_hdr->lrh[1] = cpu_to_be16(ah_attr->dlid); /* DEST LID */
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qp->s_hdr->lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
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lid = ppd->lid;
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if (lid) {
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lid |= ah_attr->src_path_bits & ((1 << ppd->lmc) - 1);
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qp->s_hdr->lrh[3] = cpu_to_be16(lid);
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} else
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qp->s_hdr->lrh[3] = IB_LID_PERMISSIVE;
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if (wqe->wr.send_flags & IB_SEND_SOLICITED)
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bth0 |= IB_BTH_SOLICITED;
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bth0 |= extra_bytes << 20;
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bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY :
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qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ?
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wqe->wr.wr.ud.pkey_index : qp->s_pkey_index);
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ohdr->bth[0] = cpu_to_be32(bth0);
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/*
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* Use the multicast QP if the destination LID is a multicast LID.
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*/
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ohdr->bth[1] = ah_attr->dlid >= QIB_MULTICAST_LID_BASE &&
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ah_attr->dlid != QIB_PERMISSIVE_LID ?
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cpu_to_be32(QIB_MULTICAST_QPN) :
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cpu_to_be32(wqe->wr.wr.ud.remote_qpn);
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ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & QIB_PSN_MASK);
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/*
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* Qkeys with the high order bit set mean use the
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* qkey from the QP context instead of the WR (see 10.2.5).
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*/
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ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->wr.wr.ud.remote_qkey < 0 ?
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qp->qkey : wqe->wr.wr.ud.remote_qkey);
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ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
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|
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done:
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ret = 1;
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goto unlock;
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|
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bail:
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qp->s_flags &= ~QIB_S_BUSY;
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unlock:
|
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spin_unlock_irqrestore(&qp->s_lock, flags);
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return ret;
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}
|
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|
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static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey)
|
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{
|
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struct qib_pportdata *ppd = ppd_from_ibp(ibp);
|
|
struct qib_devdata *dd = ppd->dd;
|
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unsigned ctxt = ppd->hw_pidx;
|
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unsigned i;
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|
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pkey &= 0x7fff; /* remove limited/full membership bit */
|
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|
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for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i)
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if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey)
|
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return i;
|
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|
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/*
|
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* Should not get here, this means hardware failed to validate pkeys.
|
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* Punt and return index 0.
|
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*/
|
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return 0;
|
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}
|
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|
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/**
|
|
* qib_ud_rcv - receive an incoming UD packet
|
|
* @ibp: the port the packet came in on
|
|
* @hdr: the packet header
|
|
* @has_grh: true if the packet has a GRH
|
|
* @data: the packet data
|
|
* @tlen: the packet length
|
|
* @qp: the QP the packet came on
|
|
*
|
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* This is called from qib_qp_rcv() to process an incoming UD packet
|
|
* for the given QP.
|
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* Called at interrupt level.
|
|
*/
|
|
void qib_ud_rcv(struct qib_ibport *ibp, struct qib_ib_header *hdr,
|
|
int has_grh, void *data, u32 tlen, struct qib_qp *qp)
|
|
{
|
|
struct qib_other_headers *ohdr;
|
|
int opcode;
|
|
u32 hdrsize;
|
|
u32 pad;
|
|
struct ib_wc wc;
|
|
u32 qkey;
|
|
u32 src_qp;
|
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u16 dlid;
|
|
|
|
/* Check for GRH */
|
|
if (!has_grh) {
|
|
ohdr = &hdr->u.oth;
|
|
hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */
|
|
} else {
|
|
ohdr = &hdr->u.l.oth;
|
|
hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */
|
|
}
|
|
qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
|
|
src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & QIB_QPN_MASK;
|
|
|
|
/*
|
|
* Get the number of bytes the message was padded by
|
|
* and drop incomplete packets.
|
|
*/
|
|
pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
|
|
if (unlikely(tlen < (hdrsize + pad + 4)))
|
|
goto drop;
|
|
|
|
tlen -= hdrsize + pad + 4;
|
|
|
|
/*
|
|
* Check that the permissive LID is only used on QP0
|
|
* and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
|
|
*/
|
|
if (qp->ibqp.qp_num) {
|
|
if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE ||
|
|
hdr->lrh[3] == IB_LID_PERMISSIVE))
|
|
goto drop;
|
|
if (qp->ibqp.qp_num > 1) {
|
|
u16 pkey1, pkey2;
|
|
|
|
pkey1 = be32_to_cpu(ohdr->bth[0]);
|
|
pkey2 = qib_get_pkey(ibp, qp->s_pkey_index);
|
|
if (unlikely(!qib_pkey_ok(pkey1, pkey2))) {
|
|
qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY,
|
|
pkey1,
|
|
(be16_to_cpu(hdr->lrh[0]) >> 4) &
|
|
0xF,
|
|
src_qp, qp->ibqp.qp_num,
|
|
hdr->lrh[3], hdr->lrh[1]);
|
|
return;
|
|
}
|
|
}
|
|
if (unlikely(qkey != qp->qkey)) {
|
|
qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_QKEY, qkey,
|
|
(be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
|
|
src_qp, qp->ibqp.qp_num,
|
|
hdr->lrh[3], hdr->lrh[1]);
|
|
return;
|
|
}
|
|
/* Drop invalid MAD packets (see 13.5.3.1). */
|
|
if (unlikely(qp->ibqp.qp_num == 1 &&
|
|
(tlen != 256 ||
|
|
(be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))
|
|
goto drop;
|
|
} else {
|
|
struct ib_smp *smp;
|
|
|
|
/* Drop invalid MAD packets (see 13.5.3.1). */
|
|
if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15)
|
|
goto drop;
|
|
smp = (struct ib_smp *) data;
|
|
if ((hdr->lrh[1] == IB_LID_PERMISSIVE ||
|
|
hdr->lrh[3] == IB_LID_PERMISSIVE) &&
|
|
smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
|
|
goto drop;
|
|
}
|
|
|
|
/*
|
|
* The opcode is in the low byte when its in network order
|
|
* (top byte when in host order).
|
|
*/
|
|
opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
|
|
if (qp->ibqp.qp_num > 1 &&
|
|
opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
|
|
wc.ex.imm_data = ohdr->u.ud.imm_data;
|
|
wc.wc_flags = IB_WC_WITH_IMM;
|
|
tlen -= sizeof(u32);
|
|
} else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
|
|
wc.ex.imm_data = 0;
|
|
wc.wc_flags = 0;
|
|
} else
|
|
goto drop;
|
|
|
|
/*
|
|
* A GRH is expected to precede the data even if not
|
|
* present on the wire.
|
|
*/
|
|
wc.byte_len = tlen + sizeof(struct ib_grh);
|
|
|
|
/*
|
|
* Get the next work request entry to find where to put the data.
|
|
*/
|
|
if (qp->r_flags & QIB_R_REUSE_SGE)
|
|
qp->r_flags &= ~QIB_R_REUSE_SGE;
|
|
else {
|
|
int ret;
|
|
|
|
ret = qib_get_rwqe(qp, 0);
|
|
if (ret < 0) {
|
|
qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
|
|
return;
|
|
}
|
|
if (!ret) {
|
|
if (qp->ibqp.qp_num == 0)
|
|
ibp->n_vl15_dropped++;
|
|
return;
|
|
}
|
|
}
|
|
/* Silently drop packets which are too big. */
|
|
if (unlikely(wc.byte_len > qp->r_len)) {
|
|
qp->r_flags |= QIB_R_REUSE_SGE;
|
|
goto drop;
|
|
}
|
|
if (has_grh) {
|
|
qib_copy_sge(&qp->r_sge, &hdr->u.l.grh,
|
|
sizeof(struct ib_grh), 1);
|
|
wc.wc_flags |= IB_WC_GRH;
|
|
} else
|
|
qib_skip_sge(&qp->r_sge, sizeof(struct ib_grh), 1);
|
|
qib_copy_sge(&qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), 1);
|
|
qib_put_ss(&qp->r_sge);
|
|
if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags))
|
|
return;
|
|
wc.wr_id = qp->r_wr_id;
|
|
wc.status = IB_WC_SUCCESS;
|
|
wc.opcode = IB_WC_RECV;
|
|
wc.vendor_err = 0;
|
|
wc.qp = &qp->ibqp;
|
|
wc.src_qp = src_qp;
|
|
wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ?
|
|
qib_lookup_pkey(ibp, be32_to_cpu(ohdr->bth[0])) : 0;
|
|
wc.slid = be16_to_cpu(hdr->lrh[3]);
|
|
wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF;
|
|
dlid = be16_to_cpu(hdr->lrh[1]);
|
|
/*
|
|
* Save the LMC lower bits if the destination LID is a unicast LID.
|
|
*/
|
|
wc.dlid_path_bits = dlid >= QIB_MULTICAST_LID_BASE ? 0 :
|
|
dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);
|
|
wc.port_num = qp->port_num;
|
|
/* Signal completion event if the solicited bit is set. */
|
|
qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
|
|
(ohdr->bth[0] &
|
|
cpu_to_be32(IB_BTH_SOLICITED)) != 0);
|
|
return;
|
|
|
|
drop:
|
|
ibp->n_pkt_drops++;
|
|
}
|