/* * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved. * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include <linux/spinlock.h> #include <rdma/ib_smi.h> #include "qib.h" #include "qib_mad.h" /* * Switch to alternate path. * The QP s_lock should be held and interrupts disabled. */ void qib_migrate_qp(struct rvt_qp *qp) { struct ib_event ev; qp->s_mig_state = IB_MIG_MIGRATED; qp->remote_ah_attr = qp->alt_ah_attr; qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr); qp->s_pkey_index = qp->s_alt_pkey_index; ev.device = qp->ibqp.device; ev.element.qp = &qp->ibqp; ev.event = IB_EVENT_PATH_MIG; qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); } static __be64 get_sguid(struct qib_ibport *ibp, unsigned index) { if (!index) { struct qib_pportdata *ppd = ppd_from_ibp(ibp); return ppd->guid; } return ibp->guids[index - 1]; } static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) { return (gid->global.interface_id == id && (gid->global.subnet_prefix == gid_prefix || gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); } /* * * This should be called with the QP r_lock held. * * The s_lock will be acquired around the qib_migrate_qp() call. */ int qib_ruc_check_hdr(struct qib_ibport *ibp, struct ib_header *hdr, int has_grh, struct rvt_qp *qp, u32 bth0) { __be64 guid; unsigned long flags; if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { if (!has_grh) { if (rdma_ah_get_ah_flags(&qp->alt_ah_attr) & IB_AH_GRH) goto err; } else { const struct ib_global_route *grh; if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) & IB_AH_GRH)) goto err; grh = rdma_ah_read_grh(&qp->alt_ah_attr); guid = get_sguid(ibp, grh->sgid_index); if (!gid_ok(&hdr->u.l.grh.dgid, ibp->rvp.gid_prefix, guid)) goto err; if (!gid_ok(&hdr->u.l.grh.sgid, grh->dgid.global.subnet_prefix, grh->dgid.global.interface_id)) goto err; } if (!qib_pkey_ok((u16)bth0, qib_get_pkey(ibp, qp->s_alt_pkey_index))) { qib_bad_pkey(ibp, (u16)bth0, (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 0, qp->ibqp.qp_num, hdr->lrh[3], hdr->lrh[1]); goto err; } /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ if ((be16_to_cpu(hdr->lrh[3]) != rdma_ah_get_dlid(&qp->alt_ah_attr)) || ppd_from_ibp(ibp)->port != rdma_ah_get_port_num(&qp->alt_ah_attr)) goto err; spin_lock_irqsave(&qp->s_lock, flags); qib_migrate_qp(qp); spin_unlock_irqrestore(&qp->s_lock, flags); } else { if (!has_grh) { if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) goto err; } else { const struct ib_global_route *grh; if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) goto err; grh = rdma_ah_read_grh(&qp->remote_ah_attr); guid = get_sguid(ibp, grh->sgid_index); if (!gid_ok(&hdr->u.l.grh.dgid, ibp->rvp.gid_prefix, guid)) goto err; if (!gid_ok(&hdr->u.l.grh.sgid, grh->dgid.global.subnet_prefix, grh->dgid.global.interface_id)) goto err; } if (!qib_pkey_ok((u16)bth0, qib_get_pkey(ibp, qp->s_pkey_index))) { qib_bad_pkey(ibp, (u16)bth0, (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 0, qp->ibqp.qp_num, hdr->lrh[3], hdr->lrh[1]); goto err; } /* Validate the SLID. See Ch. 9.6.1.5 */ if (be16_to_cpu(hdr->lrh[3]) != rdma_ah_get_dlid(&qp->remote_ah_attr) || ppd_from_ibp(ibp)->port != qp->port_num) goto err; if (qp->s_mig_state == IB_MIG_REARM && !(bth0 & IB_BTH_MIG_REQ)) qp->s_mig_state = IB_MIG_ARMED; } return 0; err: return 1; } /** * qib_make_grh - construct a GRH header * @ibp: a pointer to the IB port * @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 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr, const struct ib_global_route *grh, u32 hwords, u32 nwords) { hdr->version_tclass_flow = cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | (grh->flow_label << IB_GRH_FLOW_SHIFT)); 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 = IB_GRH_NEXT_HDR; hdr->hop_limit = grh->hop_limit; /* The SGID is 32-bit aligned. */ hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix; if (!grh->sgid_index) hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid; else if (grh->sgid_index < QIB_GUIDS_PER_PORT) hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1]; hdr->dgid = grh->dgid; /* GRH header size in 32-bit words. */ return sizeof(struct ib_grh) / sizeof(u32); } void qib_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr, u32 bth0, u32 bth2) { struct qib_qp_priv *priv = qp->priv; struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); u16 lrh0; u32 nwords; u32 extra_bytes; /* Construct the header. */ extra_bytes = -qp->s_cur_size & 3; nwords = (qp->s_cur_size + extra_bytes) >> 2; lrh0 = QIB_LRH_BTH; if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh, rdma_ah_read_grh(&qp->remote_ah_attr), qp->s_hdrwords, nwords); lrh0 = QIB_LRH_GRH; } lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 | rdma_ah_get_sl(&qp->remote_ah_attr) << 4; priv->s_hdr->lrh[0] = cpu_to_be16(lrh0); priv->s_hdr->lrh[1] = cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr)); priv->s_hdr->lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); priv->s_hdr->lrh[3] = cpu_to_be16(ppd_from_ibp(ibp)->lid | rdma_ah_get_path_bits(&qp->remote_ah_attr)); bth0 |= qib_get_pkey(ibp, qp->s_pkey_index); bth0 |= extra_bytes << 20; if (qp->s_mig_state == IB_MIG_MIGRATED) bth0 |= IB_BTH_MIG_REQ; ohdr->bth[0] = cpu_to_be32(bth0); ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); ohdr->bth[2] = cpu_to_be32(bth2); this_cpu_inc(ibp->pmastats->n_unicast_xmit); } void _qib_do_send(struct work_struct *work) { struct qib_qp_priv *priv = container_of(work, struct qib_qp_priv, s_work); struct rvt_qp *qp = priv->owner; qib_do_send(qp); } /** * qib_do_send - perform a send on a QP * @qp: 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, two threads could send packets out of order. */ void qib_do_send(struct rvt_qp *qp) { struct qib_qp_priv *priv = qp->priv; struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); struct qib_pportdata *ppd = ppd_from_ibp(ibp); int (*make_req)(struct rvt_qp *qp, unsigned long *flags); unsigned long flags; if ((qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) && (rdma_ah_get_dlid(&qp->remote_ah_attr) & ~((1 << ppd->lmc) - 1)) == ppd->lid) { rvt_ruc_loopback(qp); return; } if (qp->ibqp.qp_type == IB_QPT_RC) make_req = qib_make_rc_req; else if (qp->ibqp.qp_type == IB_QPT_UC) make_req = qib_make_uc_req; else make_req = qib_make_ud_req; spin_lock_irqsave(&qp->s_lock, flags); /* Return if we are already busy processing a work request. */ if (!qib_send_ok(qp)) { spin_unlock_irqrestore(&qp->s_lock, flags); return; } qp->s_flags |= RVT_S_BUSY; do { /* Check for a constructed packet to be sent. */ if (qp->s_hdrwords != 0) { spin_unlock_irqrestore(&qp->s_lock, flags); /* * If the packet cannot be sent now, return and * the send tasklet will be woken up later. */ if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords, qp->s_cur_sge, qp->s_cur_size)) return; /* Record that s_hdr is empty. */ qp->s_hdrwords = 0; spin_lock_irqsave(&qp->s_lock, flags); } } while (make_req(qp, &flags)); spin_unlock_irqrestore(&qp->s_lock, flags); }