315 lines
9.3 KiB
C
315 lines
9.3 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/spinlock.h>
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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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* Switch to alternate path.
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* The QP s_lock should be held and interrupts disabled.
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*/
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void qib_migrate_qp(struct rvt_qp *qp)
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{
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struct ib_event ev;
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qp->s_mig_state = IB_MIG_MIGRATED;
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qp->remote_ah_attr = qp->alt_ah_attr;
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qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr);
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qp->s_pkey_index = qp->s_alt_pkey_index;
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ev.device = qp->ibqp.device;
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ev.element.qp = &qp->ibqp;
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ev.event = IB_EVENT_PATH_MIG;
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qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
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}
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static __be64 get_sguid(struct qib_ibport *ibp, unsigned index)
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{
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if (!index) {
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struct qib_pportdata *ppd = ppd_from_ibp(ibp);
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return ppd->guid;
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}
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return ibp->guids[index - 1];
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}
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static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id)
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{
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return (gid->global.interface_id == id &&
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(gid->global.subnet_prefix == gid_prefix ||
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gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX));
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}
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/*
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*
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* This should be called with the QP r_lock held.
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*
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* The s_lock will be acquired around the qib_migrate_qp() call.
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*/
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int qib_ruc_check_hdr(struct qib_ibport *ibp, struct ib_header *hdr,
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int has_grh, struct rvt_qp *qp, u32 bth0)
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{
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__be64 guid;
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unsigned long flags;
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if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) {
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if (!has_grh) {
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if (rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
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IB_AH_GRH)
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goto err;
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} else {
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const struct ib_global_route *grh;
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if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
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IB_AH_GRH))
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goto err;
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grh = rdma_ah_read_grh(&qp->alt_ah_attr);
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guid = get_sguid(ibp, grh->sgid_index);
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if (!gid_ok(&hdr->u.l.grh.dgid,
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ibp->rvp.gid_prefix, guid))
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goto err;
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if (!gid_ok(&hdr->u.l.grh.sgid,
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grh->dgid.global.subnet_prefix,
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grh->dgid.global.interface_id))
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goto err;
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}
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if (!qib_pkey_ok((u16)bth0,
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qib_get_pkey(ibp, qp->s_alt_pkey_index))) {
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qib_bad_pkey(ibp,
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(u16)bth0,
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(be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
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0, qp->ibqp.qp_num,
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hdr->lrh[3], hdr->lrh[1]);
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goto err;
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}
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/* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */
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if ((be16_to_cpu(hdr->lrh[3]) !=
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rdma_ah_get_dlid(&qp->alt_ah_attr)) ||
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ppd_from_ibp(ibp)->port !=
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rdma_ah_get_port_num(&qp->alt_ah_attr))
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goto err;
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spin_lock_irqsave(&qp->s_lock, flags);
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qib_migrate_qp(qp);
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spin_unlock_irqrestore(&qp->s_lock, flags);
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} else {
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if (!has_grh) {
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if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
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IB_AH_GRH)
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goto err;
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} else {
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const struct ib_global_route *grh;
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if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
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IB_AH_GRH))
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goto err;
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grh = rdma_ah_read_grh(&qp->remote_ah_attr);
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guid = get_sguid(ibp, grh->sgid_index);
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if (!gid_ok(&hdr->u.l.grh.dgid,
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ibp->rvp.gid_prefix, guid))
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goto err;
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if (!gid_ok(&hdr->u.l.grh.sgid,
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grh->dgid.global.subnet_prefix,
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grh->dgid.global.interface_id))
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goto err;
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}
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if (!qib_pkey_ok((u16)bth0,
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qib_get_pkey(ibp, qp->s_pkey_index))) {
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qib_bad_pkey(ibp,
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(u16)bth0,
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(be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
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0, qp->ibqp.qp_num,
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hdr->lrh[3], hdr->lrh[1]);
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goto err;
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}
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/* Validate the SLID. See Ch. 9.6.1.5 */
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if (be16_to_cpu(hdr->lrh[3]) !=
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rdma_ah_get_dlid(&qp->remote_ah_attr) ||
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ppd_from_ibp(ibp)->port != qp->port_num)
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goto err;
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if (qp->s_mig_state == IB_MIG_REARM &&
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!(bth0 & IB_BTH_MIG_REQ))
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qp->s_mig_state = IB_MIG_ARMED;
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}
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return 0;
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err:
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return 1;
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}
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/**
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* qib_make_grh - construct a GRH header
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* @ibp: a pointer to the IB port
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* @hdr: a pointer to the GRH header being constructed
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* @grh: the global route address to send to
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* @hwords: the number of 32 bit words of header being sent
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* @nwords: the number of 32 bit words of data being sent
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*
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* Return the size of the header in 32 bit words.
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*/
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u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr,
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const struct ib_global_route *grh, u32 hwords, u32 nwords)
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{
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hdr->version_tclass_flow =
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cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) |
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(grh->traffic_class << IB_GRH_TCLASS_SHIFT) |
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(grh->flow_label << IB_GRH_FLOW_SHIFT));
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hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2);
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/* next_hdr is defined by C8-7 in ch. 8.4.1 */
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hdr->next_hdr = IB_GRH_NEXT_HDR;
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hdr->hop_limit = grh->hop_limit;
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/* The SGID is 32-bit aligned. */
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hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix;
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if (!grh->sgid_index)
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hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid;
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else if (grh->sgid_index < QIB_GUIDS_PER_PORT)
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hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1];
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hdr->dgid = grh->dgid;
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/* GRH header size in 32-bit words. */
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return sizeof(struct ib_grh) / sizeof(u32);
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}
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void qib_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr,
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u32 bth0, u32 bth2)
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{
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struct qib_qp_priv *priv = qp->priv;
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struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
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u16 lrh0;
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u32 nwords;
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u32 extra_bytes;
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/* Construct the header. */
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extra_bytes = -qp->s_cur_size & 3;
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nwords = (qp->s_cur_size + extra_bytes) >> 2;
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lrh0 = QIB_LRH_BTH;
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if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
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qp->s_hdrwords +=
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qib_make_grh(ibp, &priv->s_hdr->u.l.grh,
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rdma_ah_read_grh(&qp->remote_ah_attr),
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qp->s_hdrwords, nwords);
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lrh0 = QIB_LRH_GRH;
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}
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lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 |
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rdma_ah_get_sl(&qp->remote_ah_attr) << 4;
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priv->s_hdr->lrh[0] = cpu_to_be16(lrh0);
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priv->s_hdr->lrh[1] =
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cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr));
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priv->s_hdr->lrh[2] =
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cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
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priv->s_hdr->lrh[3] =
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cpu_to_be16(ppd_from_ibp(ibp)->lid |
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rdma_ah_get_path_bits(&qp->remote_ah_attr));
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bth0 |= qib_get_pkey(ibp, qp->s_pkey_index);
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bth0 |= extra_bytes << 20;
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if (qp->s_mig_state == IB_MIG_MIGRATED)
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bth0 |= IB_BTH_MIG_REQ;
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ohdr->bth[0] = cpu_to_be32(bth0);
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ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
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ohdr->bth[2] = cpu_to_be32(bth2);
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this_cpu_inc(ibp->pmastats->n_unicast_xmit);
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}
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void _qib_do_send(struct work_struct *work)
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{
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struct qib_qp_priv *priv = container_of(work, struct qib_qp_priv,
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s_work);
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struct rvt_qp *qp = priv->owner;
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qib_do_send(qp);
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}
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/**
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* qib_do_send - perform a send on a QP
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* @qp: pointer to the QP
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*
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* Process entries in the send work queue until credit or queue is
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* exhausted. Only allow one CPU to send a packet per QP (tasklet).
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* Otherwise, two threads could send packets out of order.
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*/
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void qib_do_send(struct rvt_qp *qp)
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{
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struct qib_qp_priv *priv = qp->priv;
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struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
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struct qib_pportdata *ppd = ppd_from_ibp(ibp);
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int (*make_req)(struct rvt_qp *qp, unsigned long *flags);
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unsigned long flags;
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if ((qp->ibqp.qp_type == IB_QPT_RC ||
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qp->ibqp.qp_type == IB_QPT_UC) &&
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(rdma_ah_get_dlid(&qp->remote_ah_attr) &
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~((1 << ppd->lmc) - 1)) == ppd->lid) {
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rvt_ruc_loopback(qp);
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return;
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}
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if (qp->ibqp.qp_type == IB_QPT_RC)
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make_req = qib_make_rc_req;
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else if (qp->ibqp.qp_type == IB_QPT_UC)
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make_req = qib_make_uc_req;
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else
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make_req = qib_make_ud_req;
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spin_lock_irqsave(&qp->s_lock, flags);
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/* Return if we are already busy processing a work request. */
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if (!qib_send_ok(qp)) {
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spin_unlock_irqrestore(&qp->s_lock, flags);
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return;
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}
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qp->s_flags |= RVT_S_BUSY;
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do {
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/* Check for a constructed packet to be sent. */
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if (qp->s_hdrwords != 0) {
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spin_unlock_irqrestore(&qp->s_lock, flags);
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/*
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* If the packet cannot be sent now, return and
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* the send tasklet will be woken up later.
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*/
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if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords,
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qp->s_cur_sge, qp->s_cur_size))
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return;
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/* Record that s_hdr is empty. */
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qp->s_hdrwords = 0;
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spin_lock_irqsave(&qp->s_lock, flags);
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}
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} while (make_req(qp, &flags));
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spin_unlock_irqrestore(&qp->s_lock, flags);
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}
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