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- /*
- * 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.
- */
- static 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:;
- }
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