diff options
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_ud.c')
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_ud.c | 621 |
1 files changed, 621 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_ud.c b/drivers/infiniband/hw/ipath/ipath_ud.c new file mode 100644 index 000000000000..5ff3de6128b2 --- /dev/null +++ b/drivers/infiniband/hw/ipath/ipath_ud.c @@ -0,0 +1,621 @@ +/* + * 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 "ipath_verbs.h" +#include "ips_common.h" + +/** + * ipath_ud_loopback - handle send on loopback QPs + * @sqp: the QP + * @ss: the SGE state + * @length: the length of the data to send + * @wr: the work request + * @wc: the work completion entry + * + * This is called from ipath_post_ud_send() to forward a WQE addressed + * to the same HCA. + */ +void ipath_ud_loopback(struct ipath_qp *sqp, struct ipath_sge_state *ss, + u32 length, struct ib_send_wr *wr, struct ib_wc *wc) +{ + struct ipath_ibdev *dev = to_idev(sqp->ibqp.device); + struct ipath_qp *qp; + struct ib_ah_attr *ah_attr; + unsigned long flags; + struct ipath_rq *rq; + struct ipath_srq *srq; + struct ipath_sge_state rsge; + struct ipath_sge *sge; + struct ipath_rwqe *wqe; + + qp = ipath_lookup_qpn(&dev->qp_table, wr->wr.ud.remote_qpn); + if (!qp) + return; + + /* + * 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 (unlikely(qp->ibqp.qp_num && + ((int) wr->wr.ud.remote_qkey < 0 + ? qp->qkey : wr->wr.ud.remote_qkey) != qp->qkey)) { + /* XXX OK to lose a count once in a while. */ + dev->qkey_violations++; + dev->n_pkt_drops++; + goto done; + } + + /* + * A GRH is expected to preceed the data even if not + * present on the wire. + */ + wc->byte_len = length + sizeof(struct ib_grh); + + if (wr->opcode == IB_WR_SEND_WITH_IMM) { + wc->wc_flags = IB_WC_WITH_IMM; + wc->imm_data = wr->imm_data; + } else { + wc->wc_flags = 0; + wc->imm_data = 0; + } + + /* + * Get the next work request entry to find where to put the data. + * Note that it is safe to drop the lock after changing rq->tail + * since ipath_post_receive() won't fill the empty slot. + */ + if (qp->ibqp.srq) { + srq = to_isrq(qp->ibqp.srq); + rq = &srq->rq; + } else { + srq = NULL; + rq = &qp->r_rq; + } + spin_lock_irqsave(&rq->lock, flags); + if (rq->tail == rq->head) { + spin_unlock_irqrestore(&rq->lock, flags); + dev->n_pkt_drops++; + goto done; + } + /* Silently drop packets which are too big. */ + wqe = get_rwqe_ptr(rq, rq->tail); + if (wc->byte_len > wqe->length) { + spin_unlock_irqrestore(&rq->lock, flags); + dev->n_pkt_drops++; + goto done; + } + wc->wr_id = wqe->wr_id; + rsge.sge = wqe->sg_list[0]; + rsge.sg_list = wqe->sg_list + 1; + rsge.num_sge = wqe->num_sge; + if (++rq->tail >= rq->size) + rq->tail = 0; + if (srq && srq->ibsrq.event_handler) { + u32 n; + + if (rq->head < rq->tail) + n = rq->size + rq->head - rq->tail; + else + n = rq->head - rq->tail; + if (n < srq->limit) { + struct ib_event ev; + + srq->limit = 0; + spin_unlock_irqrestore(&rq->lock, flags); + ev.device = qp->ibqp.device; + ev.element.srq = qp->ibqp.srq; + ev.event = IB_EVENT_SRQ_LIMIT_REACHED; + srq->ibsrq.event_handler(&ev, + srq->ibsrq.srq_context); + } else + spin_unlock_irqrestore(&rq->lock, flags); + } else + spin_unlock_irqrestore(&rq->lock, flags); + ah_attr = &to_iah(wr->wr.ud.ah)->attr; + if (ah_attr->ah_flags & IB_AH_GRH) { + ipath_copy_sge(&rsge, &ah_attr->grh, sizeof(struct ib_grh)); + wc->wc_flags |= IB_WC_GRH; + } else + ipath_skip_sge(&rsge, sizeof(struct ib_grh)); + sge = &ss->sge; + while (length) { + u32 len = sge->length; + + if (len > length) + len = length; + BUG_ON(len == 0); + ipath_copy_sge(&rsge, sge->vaddr, len); + sge->vaddr += len; + sge->length -= len; + sge->sge_length -= len; + if (sge->sge_length == 0) { + if (--ss->num_sge) + *sge = *ss->sg_list++; + } else if (sge->length == 0 && sge->mr != NULL) { + if (++sge->n >= IPATH_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; + } + wc->status = IB_WC_SUCCESS; + wc->opcode = IB_WC_RECV; + wc->vendor_err = 0; + wc->qp_num = qp->ibqp.qp_num; + wc->src_qp = sqp->ibqp.qp_num; + /* XXX do we know which pkey matched? Only needed for GSI. */ + wc->pkey_index = 0; + wc->slid = ipath_layer_get_lid(dev->dd) | + (ah_attr->src_path_bits & + ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1)); + wc->sl = ah_attr->sl; + wc->dlid_path_bits = + ah_attr->dlid & ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1); + /* Signal completion event if the solicited bit is set. */ + ipath_cq_enter(to_icq(qp->ibqp.recv_cq), wc, + wr->send_flags & IB_SEND_SOLICITED); + +done: + if (atomic_dec_and_test(&qp->refcount)) + wake_up(&qp->wait); +} + +/** + * ipath_post_ud_send - post a UD send on QP + * @qp: the QP + * @wr: the work request + * + * Note that we actually send the data as it is posted instead of putting + * the request into a ring buffer. If we wanted to use a ring buffer, + * we would need to save a reference to the destination address in the SWQE. + */ +int ipath_post_ud_send(struct ipath_qp *qp, struct ib_send_wr *wr) +{ + struct ipath_ibdev *dev = to_idev(qp->ibqp.device); + struct ipath_other_headers *ohdr; + struct ib_ah_attr *ah_attr; + struct ipath_sge_state ss; + struct ipath_sge *sg_list; + struct ib_wc wc; + u32 hwords; + u32 nwords; + u32 len; + u32 extra_bytes; + u32 bth0; + u16 lrh0; + u16 lid; + int i; + int ret; + + if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) { + ret = 0; + goto bail; + } + + /* IB spec says that num_sge == 0 is OK. */ + if (wr->num_sge > qp->s_max_sge) { + ret = -EINVAL; + goto bail; + } + + if (wr->num_sge > 1) { + sg_list = kmalloc((qp->s_max_sge - 1) * sizeof(*sg_list), + GFP_ATOMIC); + if (!sg_list) { + ret = -ENOMEM; + goto bail; + } + } else + sg_list = NULL; + + /* Check the buffer to send. */ + ss.sg_list = sg_list; + ss.sge.mr = NULL; + ss.sge.vaddr = NULL; + ss.sge.length = 0; + ss.sge.sge_length = 0; + ss.num_sge = 0; + len = 0; + for (i = 0; i < wr->num_sge; i++) { + /* Check LKEY */ + if (to_ipd(qp->ibqp.pd)->user && wr->sg_list[i].lkey == 0) { + ret = -EINVAL; + goto bail; + } + + if (wr->sg_list[i].length == 0) + continue; + if (!ipath_lkey_ok(&dev->lk_table, ss.num_sge ? + sg_list + ss.num_sge - 1 : &ss.sge, + &wr->sg_list[i], 0)) { + ret = -EINVAL; + goto bail; + } + len += wr->sg_list[i].length; + ss.num_sge++; + } + extra_bytes = (4 - len) & 3; + nwords = (len + extra_bytes) >> 2; + + /* Construct the header. */ + ah_attr = &to_iah(wr->wr.ud.ah)->attr; + if (ah_attr->dlid == 0) { + ret = -EINVAL; + goto bail; + } + if (ah_attr->dlid >= IPS_MULTICAST_LID_BASE) { + if (ah_attr->dlid != IPS_PERMISSIVE_LID) + dev->n_multicast_xmit++; + else + dev->n_unicast_xmit++; + } else { + dev->n_unicast_xmit++; + lid = ah_attr->dlid & + ~((1 << (dev->mkeyprot_resv_lmc & 7)) - 1); + if (unlikely(lid == ipath_layer_get_lid(dev->dd))) { + /* + * Pass in an uninitialized ib_wc to save stack + * space. + */ + ipath_ud_loopback(qp, &ss, len, wr, &wc); + goto done; + } + } + if (ah_attr->ah_flags & IB_AH_GRH) { + /* Header size in 32-bit words. */ + hwords = 17; + lrh0 = IPS_LRH_GRH; + ohdr = &qp->s_hdr.u.l.oth; + qp->s_hdr.u.l.grh.version_tclass_flow = + cpu_to_be32((6 << 28) | + (ah_attr->grh.traffic_class << 20) | + ah_attr->grh.flow_label); + qp->s_hdr.u.l.grh.paylen = + cpu_to_be16(((wr->opcode == + IB_WR_SEND_WITH_IMM ? 6 : 5) + + nwords + SIZE_OF_CRC) << 2); + /* next_hdr is defined by C8-7 in ch. 8.4.1 */ + qp->s_hdr.u.l.grh.next_hdr = 0x1B; + qp->s_hdr.u.l.grh.hop_limit = ah_attr->grh.hop_limit; + /* The SGID is 32-bit aligned. */ + qp->s_hdr.u.l.grh.sgid.global.subnet_prefix = + dev->gid_prefix; + qp->s_hdr.u.l.grh.sgid.global.interface_id = + ipath_layer_get_guid(dev->dd); + qp->s_hdr.u.l.grh.dgid = ah_attr->grh.dgid; + /* + * 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. */ + hwords = 7; + lrh0 = IPS_LRH_BTH; + ohdr = &qp->s_hdr.u.oth; + } + if (wr->opcode == IB_WR_SEND_WITH_IMM) { + ohdr->u.ud.imm_data = wr->imm_data; + wc.imm_data = wr->imm_data; + hwords += 1; + bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; + } else if (wr->opcode == IB_WR_SEND) { + wc.imm_data = 0; + bth0 = IB_OPCODE_UD_SEND_ONLY << 24; + } else { + ret = -EINVAL; + goto bail; + } + lrh0 |= ah_attr->sl << 4; + if (qp->ibqp.qp_type == IB_QPT_SMI) + lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ + 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(hwords + nwords + SIZE_OF_CRC); + lid = ipath_layer_get_lid(dev->dd); + if (lid) { + lid |= ah_attr->src_path_bits & + ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1); + qp->s_hdr.lrh[3] = cpu_to_be16(lid); + } else + qp->s_hdr.lrh[3] = IB_LID_PERMISSIVE; + if (wr->send_flags & IB_SEND_SOLICITED) + bth0 |= 1 << 23; + bth0 |= extra_bytes << 20; + bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? IPS_DEFAULT_P_KEY : + ipath_layer_get_pkey(dev->dd, 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 >= IPS_MULTICAST_LID_BASE && + ah_attr->dlid != IPS_PERMISSIVE_LID ? + __constant_cpu_to_be32(IPS_MULTICAST_QPN) : + cpu_to_be32(wr->wr.ud.remote_qpn); + /* XXX Could lose a PSN count but not worth locking */ + ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & IPS_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)wr->wr.ud.remote_qkey < 0 ? + qp->qkey : wr->wr.ud.remote_qkey); + ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); + if (ipath_verbs_send(dev->dd, hwords, (u32 *) &qp->s_hdr, + len, &ss)) + dev->n_no_piobuf++; + +done: + /* Queue the completion status entry. */ + if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &qp->s_flags) || + (wr->send_flags & IB_SEND_SIGNALED)) { + wc.wr_id = wr->wr_id; + wc.status = IB_WC_SUCCESS; + wc.vendor_err = 0; + wc.opcode = IB_WC_SEND; + wc.byte_len = len; + wc.qp_num = qp->ibqp.qp_num; + wc.src_qp = 0; + wc.wc_flags = 0; + /* XXX initialize other fields? */ + ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); + } + kfree(sg_list); + + ret = 0; + +bail: + return ret; +} + +/** + * ipath_ud_rcv - receive an incoming UD packet + * @dev: the device 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 ipath_qp_rcv() to process an incoming UD packet + * for the given QP. + * Called at interrupt level. + */ +void ipath_ud_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, + int has_grh, void *data, u32 tlen, struct ipath_qp *qp) +{ + struct ipath_other_headers *ohdr; + int opcode; + u32 hdrsize; + u32 pad; + unsigned long flags; + struct ib_wc wc; + u32 qkey; + u32 src_qp; + struct ipath_rq *rq; + struct ipath_srq *srq; + struct ipath_rwqe *wqe; + u16 dlid; + int header_in_data; + + /* Check for GRH */ + if (!has_grh) { + ohdr = &hdr->u.oth; + hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */ + qkey = be32_to_cpu(ohdr->u.ud.deth[0]); + src_qp = be32_to_cpu(ohdr->u.ud.deth[1]); + header_in_data = 0; + } else { + ohdr = &hdr->u.l.oth; + hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */ + /* + * The header with GRH is 68 bytes and the core driver sets + * the eager header buffer size to 56 bytes so the last 12 + * bytes of the IB header is in the data buffer. + */ + header_in_data = + ipath_layer_get_rcvhdrentsize(dev->dd) == 16; + if (header_in_data) { + qkey = be32_to_cpu(((__be32 *) data)[1]); + src_qp = be32_to_cpu(((__be32 *) data)[2]); + data += 12; + } else { + qkey = be32_to_cpu(ohdr->u.ud.deth[0]); + src_qp = be32_to_cpu(ohdr->u.ud.deth[1]); + } + } + src_qp &= IPS_QPN_MASK; + + /* + * 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)) { + dev->n_pkt_drops++; + goto bail; + } + if (unlikely(qkey != qp->qkey)) { + /* XXX OK to lose a count once in a while. */ + dev->qkey_violations++; + dev->n_pkt_drops++; + goto bail; + } + } else if (hdr->lrh[1] == IB_LID_PERMISSIVE || + hdr->lrh[3] == IB_LID_PERMISSIVE) { + struct ib_smp *smp = (struct ib_smp *) data; + + if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { + dev->n_pkt_drops++; + goto bail; + } + } + + /* 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. */ + dev->n_pkt_drops++; + goto bail; + } + tlen -= hdrsize + pad + 4; + + /* Drop invalid MAD packets (see 13.5.3.1). */ + if (unlikely((qp->ibqp.qp_num == 0 && + (tlen != 256 || + (be16_to_cpu(hdr->lrh[0]) >> 12) != 15)) || + (qp->ibqp.qp_num == 1 && + (tlen != 256 || + (be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))) { + dev->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); + + /* + * 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) { + if (header_in_data) { + wc.imm_data = *(__be32 *) data; + data += sizeof(__be32); + } else + wc.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.imm_data = 0; + wc.wc_flags = 0; + } else { + dev->n_pkt_drops++; + goto bail; + } + + /* + * Get the next work request entry to find where to put the data. + * Note that it is safe to drop the lock after changing rq->tail + * since ipath_post_receive() won't fill the empty slot. + */ + if (qp->ibqp.srq) { + srq = to_isrq(qp->ibqp.srq); + rq = &srq->rq; + } else { + srq = NULL; + rq = &qp->r_rq; + } + spin_lock_irqsave(&rq->lock, flags); + if (rq->tail == rq->head) { + spin_unlock_irqrestore(&rq->lock, flags); + dev->n_pkt_drops++; + goto bail; + } + /* Silently drop packets which are too big. */ + wqe = get_rwqe_ptr(rq, rq->tail); + if (wc.byte_len > wqe->length) { + spin_unlock_irqrestore(&rq->lock, flags); + dev->n_pkt_drops++; + goto bail; + } + wc.wr_id = wqe->wr_id; + qp->r_sge.sge = wqe->sg_list[0]; + qp->r_sge.sg_list = wqe->sg_list + 1; + qp->r_sge.num_sge = wqe->num_sge; + if (++rq->tail >= rq->size) + rq->tail = 0; + if (srq && srq->ibsrq.event_handler) { + u32 n; + + if (rq->head < rq->tail) + n = rq->size + rq->head - rq->tail; + else + n = rq->head - rq->tail; + if (n < srq->limit) { + struct ib_event ev; + + srq->limit = 0; + spin_unlock_irqrestore(&rq->lock, flags); + ev.device = qp->ibqp.device; + ev.element.srq = qp->ibqp.srq; + ev.event = IB_EVENT_SRQ_LIMIT_REACHED; + srq->ibsrq.event_handler(&ev, + srq->ibsrq.srq_context); + } else + spin_unlock_irqrestore(&rq->lock, flags); + } else + spin_unlock_irqrestore(&rq->lock, flags); + if (has_grh) { + ipath_copy_sge(&qp->r_sge, &hdr->u.l.grh, + sizeof(struct ib_grh)); + wc.wc_flags |= IB_WC_GRH; + } else + ipath_skip_sge(&qp->r_sge, sizeof(struct ib_grh)); + ipath_copy_sge(&qp->r_sge, data, + wc.byte_len - sizeof(struct ib_grh)); + wc.status = IB_WC_SUCCESS; + wc.opcode = IB_WC_RECV; + wc.vendor_err = 0; + wc.qp_num = qp->ibqp.qp_num; + wc.src_qp = src_qp; + /* XXX do we know which pkey matched? Only needed for GSI. */ + wc.pkey_index = 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 >= IPS_MULTICAST_LID_BASE ? 0 : + dlid & ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1); + /* Signal completion event if the solicited bit is set. */ + ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, + (ohdr->bth[0] & + __constant_cpu_to_be32(1 << 23)) != 0); + +bail:; +} |
