diff options
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_ud.c')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_ud.c | 607 |
1 files changed, 607 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/qib/qib_ud.c b/drivers/infiniband/hw/qib/qib_ud.c new file mode 100644 index 0000000..c838cda --- /dev/null +++ b/drivers/infiniband/hw/qib/qib_ud.c @@ -0,0 +1,607 @@ +/* + * 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 <rdma/ib_smi.h> + +#include "qib.h" +#include "qib_mad.h" + +/** + * qib_ud_loopback - handle send on loopback QPs + * @sqp: the sending QP + * @swqe: the send work request + * + * This is called from qib_make_ud_req() to forward a WQE addressed + * to the same HCA. + * Note that the receive interrupt handler may be calling qib_ud_rcv() + * while this is being called. + */ +static void qib_ud_loopback(struct qib_qp *sqp, struct qib_swqe *swqe) +{ + struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); + struct qib_pportdata *ppd; + struct qib_qp *qp; + struct ib_ah_attr *ah_attr; + unsigned long flags; + struct qib_sge_state ssge; + struct qib_sge *sge; + struct ib_wc wc; + u32 length; + + qp = qib_lookup_qpn(ibp, swqe->wr.wr.ud.remote_qpn); + if (!qp) { + ibp->n_pkt_drops++; + return; + } + if (qp->ibqp.qp_type != sqp->ibqp.qp_type || + !(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) { + ibp->n_pkt_drops++; + goto drop; + } + + ah_attr = &to_iah(swqe->wr.wr.ud.ah)->attr; + ppd = ppd_from_ibp(ibp); + + if (qp->ibqp.qp_num > 1) { + u16 pkey1; + u16 pkey2; + u16 lid; + + pkey1 = qib_get_pkey(ibp, sqp->s_pkey_index); + pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); + if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { + lid = ppd->lid | (ah_attr->src_path_bits & + ((1 << ppd->lmc) - 1)); + qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, pkey1, + ah_attr->sl, + sqp->ibqp.qp_num, qp->ibqp.qp_num, + cpu_to_be16(lid), + cpu_to_be16(ah_attr->dlid)); + goto drop; + } + } + + /* + * Check that the qkey matches (except for QP0, see 9.6.1.4.1). + * Qkeys with the high order bit set mean use the + * qkey from the QP context instead of the WR (see 10.2.5). + */ + if (qp->ibqp.qp_num) { + u32 qkey; + + qkey = (int)swqe->wr.wr.ud.remote_qkey < 0 ? + sqp->qkey : swqe->wr.wr.ud.remote_qkey; + if (unlikely(qkey != qp->qkey)) { + u16 lid; + + lid = ppd->lid | (ah_attr->src_path_bits & + ((1 << ppd->lmc) - 1)); + qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_QKEY, qkey, + ah_attr->sl, + sqp->ibqp.qp_num, qp->ibqp.qp_num, + cpu_to_be16(lid), + cpu_to_be16(ah_attr->dlid)); + goto drop; + } + } + + /* + * A GRH is expected to preceed the data even if not + * present on the wire. + */ + length = swqe->length; + memset(&wc, 0, sizeof wc); + wc.byte_len = length + sizeof(struct ib_grh); + + if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) { + wc.wc_flags = IB_WC_WITH_IMM; + wc.ex.imm_data = swqe->wr.ex.imm_data; + } + + spin_lock_irqsave(&qp->r_lock, flags); + + /* + * 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); + goto bail_unlock; + } + if (!ret) { + if (qp->ibqp.qp_num == 0) + ibp->n_vl15_dropped++; + goto bail_unlock; + } + } + /* Silently drop packets which are too big. */ + if (unlikely(wc.byte_len > qp->r_len)) { + qp->r_flags |= QIB_R_REUSE_SGE; + ibp->n_pkt_drops++; + goto bail_unlock; + } + + if (ah_attr->ah_flags & IB_AH_GRH) { + qib_copy_sge(&qp->r_sge, &ah_attr->grh, + sizeof(struct ib_grh), 1); + wc.wc_flags |= IB_WC_GRH; + } else + qib_skip_sge(&qp->r_sge, sizeof(struct ib_grh), 1); + ssge.sg_list = swqe->sg_list + 1; + ssge.sge = *swqe->sg_list; + ssge.num_sge = swqe->wr.num_sge; + sge = &ssge.sge; + while (length) { + u32 len = sge->length; + + if (len > length) + len = length; + if (len > sge->sge_length) + len = sge->sge_length; + BUG_ON(len == 0); + qib_copy_sge(&qp->r_sge, sge->vaddr, len, 1); + sge->vaddr += len; + sge->length -= len; + sge->sge_length -= len; + if (sge->sge_length == 0) { + if (--ssge.num_sge) + *sge = *ssge.sg_list++; + } else if (sge->length == 0 && sge->mr->lkey) { + if (++sge->n >= QIB_SEGSZ) { + if (++sge->m >= sge->mr->mapsz) + break; + sge->n = 0; + } + sge->vaddr = + sge->mr->map[sge->m]->segs[sge->n].vaddr; + sge->length = + sge->mr->map[sge->m]->segs[sge->n].length; + } + length -= len; + } + while (qp->r_sge.num_sge) { + atomic_dec(&qp->r_sge.sge.mr->refcount); + if (--qp->r_sge.num_sge) + qp->r_sge.sge = *qp->r_sge.sg_list++; + } + if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) + goto bail_unlock; + wc.wr_id = qp->r_wr_id; + wc.status = IB_WC_SUCCESS; + wc.opcode = IB_WC_RECV; + wc.qp = &qp->ibqp; + wc.src_qp = sqp->ibqp.qp_num; + wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? + swqe->wr.wr.ud.pkey_index : 0; + wc.slid = ppd->lid | (ah_attr->src_path_bits & ((1 << ppd->lmc) - 1)); + wc.sl = ah_attr->sl; + wc.dlid_path_bits = ah_attr->dlid & ((1 << ppd->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, + swqe->wr.send_flags & IB_SEND_SOLICITED); + ibp->n_loop_pkts++; +bail_unlock: + spin_unlock_irqrestore(&qp->r_lock, flags); +drop: + if (atomic_dec_and_test(&qp->refcount)) + wake_up(&qp->wait); +} + +/** + * qib_make_ud_req - construct a UD request packet + * @qp: the QP + * + * Return 1 if constructed; otherwise, return 0. + */ +int qib_make_ud_req(struct qib_qp *qp) +{ + struct qib_other_headers *ohdr; + struct ib_ah_attr *ah_attr; + struct qib_pportdata *ppd; + struct qib_ibport *ibp; + struct qib_swqe *wqe; + unsigned long flags; + u32 nwords; + u32 extra_bytes; + u32 bth0; + u16 lrh0; + u16 lid; + int ret = 0; + int next_cur; + + spin_lock_irqsave(&qp->s_lock, flags); + + if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_NEXT_SEND_OK)) { + if (!(ib_qib_state_ops[qp->state] & QIB_FLUSH_SEND)) + goto bail; + /* We are in the error state, flush the work request. */ + if (qp->s_last == qp->s_head) + goto bail; + /* If DMAs are in progress, we can't flush immediately. */ + if (atomic_read(&qp->s_dma_busy)) { + qp->s_flags |= QIB_S_WAIT_DMA; + goto bail; + } + wqe = get_swqe_ptr(qp, qp->s_last); + qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); + goto done; + } + + if (qp->s_cur == qp->s_head) + goto bail; + + wqe = get_swqe_ptr(qp, qp->s_cur); + next_cur = qp->s_cur + 1; + if (next_cur >= qp->s_size) + next_cur = 0; + + /* Construct the header. */ + ibp = to_iport(qp->ibqp.device, qp->port_num); + ppd = ppd_from_ibp(ibp); + ah_attr = &to_iah(wqe->wr.wr.ud.ah)->attr; + if (ah_attr->dlid >= QIB_MULTICAST_LID_BASE) { + if (ah_attr->dlid != QIB_PERMISSIVE_LID) + ibp->n_multicast_xmit++; + else + ibp->n_unicast_xmit++; + } else { + ibp->n_unicast_xmit++; + lid = ah_attr->dlid & ~((1 << ppd->lmc) - 1); + if (unlikely(lid == ppd->lid)) { + /* + * If DMAs are in progress, we can't generate + * a completion for the loopback packet since + * it would be out of order. + * XXX Instead of waiting, we could queue a + * zero length descriptor so we get a callback. + */ + if (atomic_read(&qp->s_dma_busy)) { + qp->s_flags |= QIB_S_WAIT_DMA; + goto bail; + } + qp->s_cur = next_cur; + spin_unlock_irqrestore(&qp->s_lock, flags); + qib_ud_loopback(qp, wqe); + spin_lock_irqsave(&qp->s_lock, flags); + qib_send_complete(qp, wqe, IB_WC_SUCCESS); + goto done; + } + } + + qp->s_cur = next_cur; + extra_bytes = -wqe->length & 3; + nwords = (wqe->length + extra_bytes) >> 2; + + /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */ + qp->s_hdrwords = 7; + qp->s_cur_size = wqe->length; + qp->s_cur_sge = &qp->s_sge; + qp->s_srate = ah_attr->static_rate; + qp->s_wqe = wqe; + qp->s_sge.sge = wqe->sg_list[0]; + qp->s_sge.sg_list = wqe->sg_list + 1; + qp->s_sge.num_sge = wqe->wr.num_sge; + qp->s_sge.total_len = wqe->length; + + if (ah_attr->ah_flags & IB_AH_GRH) { + /* Header size in 32-bit words. */ + qp->s_hdrwords += qib_make_grh(ibp, &qp->s_hdr.u.l.grh, + &ah_attr->grh, + qp->s_hdrwords, nwords); + lrh0 = QIB_LRH_GRH; + ohdr = &qp->s_hdr.u.l.oth; + /* + * Don't worry about sending to locally attached multicast + * QPs. It is unspecified by the spec. what happens. + */ + } else { + /* Header size in 32-bit words. */ + lrh0 = QIB_LRH_BTH; + ohdr = &qp->s_hdr.u.oth; + } + if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { + qp->s_hdrwords++; + ohdr->u.ud.imm_data = wqe->wr.ex.imm_data; + bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; + } else + bth0 = IB_OPCODE_UD_SEND_ONLY << 24; + lrh0 |= ah_attr->sl << 4; + if (qp->ibqp.qp_type == IB_QPT_SMI) + lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ + else + lrh0 |= ibp->sl_to_vl[ah_attr->sl] << 12; + qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); + qp->s_hdr.lrh[1] = cpu_to_be16(ah_attr->dlid); /* DEST LID */ + qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); + lid = ppd->lid; + if (lid) { + lid |= ah_attr->src_path_bits & ((1 << ppd->lmc) - 1); + qp->s_hdr.lrh[3] = cpu_to_be16(lid); + } else + qp->s_hdr.lrh[3] = IB_LID_PERMISSIVE; + if (wqe->wr.send_flags & IB_SEND_SOLICITED) + bth0 |= IB_BTH_SOLICITED; + bth0 |= extra_bytes << 20; + bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY : + qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ? + wqe->wr.wr.ud.pkey_index : qp->s_pkey_index); + ohdr->bth[0] = cpu_to_be32(bth0); + /* + * Use the multicast QP if the destination LID is a multicast LID. + */ + ohdr->bth[1] = ah_attr->dlid >= QIB_MULTICAST_LID_BASE && + ah_attr->dlid != QIB_PERMISSIVE_LID ? + cpu_to_be32(QIB_MULTICAST_QPN) : + cpu_to_be32(wqe->wr.wr.ud.remote_qpn); + ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & QIB_PSN_MASK); + /* + * Qkeys with the high order bit set mean use the + * qkey from the QP context instead of the WR (see 10.2.5). + */ + ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->wr.wr.ud.remote_qkey < 0 ? + qp->qkey : wqe->wr.wr.ud.remote_qkey); + ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); + +done: + ret = 1; + goto unlock; + +bail: + qp->s_flags &= ~QIB_S_BUSY; +unlock: + spin_unlock_irqrestore(&qp->s_lock, flags); + return ret; +} + +static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey) +{ + struct qib_pportdata *ppd = ppd_from_ibp(ibp); + struct qib_devdata *dd = ppd->dd; + unsigned ctxt = ppd->hw_pidx; + unsigned i; + + pkey &= 0x7fff; /* remove limited/full membership bit */ + + for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i) + if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey) + return i; + + /* + * Should not get here, this means hardware failed to validate pkeys. + * Punt and return index 0. + */ + return 0; +} + +/** + * 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 + * + * This is called from qib_qp_rcv() to process an incoming UD packet + * for the given QP. + * 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; + 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. */ + pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; + if (unlikely(tlen < (hdrsize + pad + 4))) { + /* Drop incomplete packets. */ + ibp->n_pkt_drops++; + goto bail; + } + 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)) { + ibp->n_pkt_drops++; + goto bail; + } + 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]); + goto bail; + } + } + 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]); + goto bail; + } + /* 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))) { + ibp->n_pkt_drops++; + goto bail; + } + } 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) { + ibp->n_pkt_drops++; + goto bail; + } + 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) { + ibp->n_pkt_drops++; + goto bail; + } + } + + /* + * 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; + hdrsize += sizeof(u32); + } else if (opcode == IB_OPCODE_UD_SEND_ONLY) { + wc.ex.imm_data = 0; + wc.wc_flags = 0; + } else { + ibp->n_pkt_drops++; + goto bail; + } + + /* + * A GRH is expected to preceed the data even if not + * present on the wire. + */ + wc.byte_len = tlen + sizeof(struct ib_grh); + + /* + * We need to serialize getting a receive work queue entry and + * generating a completion for it against QPs sending to this QP + * locally. + */ + spin_lock(&qp->r_lock); + + /* + * 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); + goto bail_unlock; + } + if (!ret) { + if (qp->ibqp.qp_num == 0) + ibp->n_vl15_dropped++; + goto bail_unlock; + } + } + /* Silently drop packets which are too big. */ + if (unlikely(wc.byte_len > qp->r_len)) { + qp->r_flags |= QIB_R_REUSE_SGE; + ibp->n_pkt_drops++; + goto bail_unlock; + } + 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); + while (qp->r_sge.num_sge) { + atomic_dec(&qp->r_sge.sge.mr->refcount); + if (--qp->r_sge.num_sge) + qp->r_sge.sge = *qp->r_sge.sg_list++; + } + if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) + goto bail_unlock; + 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); +bail_unlock: + spin_unlock(&qp->r_lock); +bail:; +} |