--- /dev/null
+/*
+ * Copyright (c) 2006, 2007, 2008 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 "ipath_verbs.h"
+#include "ipath_kernel.h"
+
+/**
+ * ipath_ud_loopback - handle send on loopback QPs
+ * @sqp: the sending QP
+ * @swqe: the send work request
+ *
+ * This is called from ipath_make_ud_req() to forward a WQE addressed
+ * to the same HCA.
+ * Note that the receive interrupt handler may be calling ipath_ud_rcv()
+ * while this is being called.
+ */
+static void ipath_ud_loopback(struct ipath_qp *sqp, struct ipath_swqe *swqe)
+{
+ 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_rwq *wq;
+ struct ipath_rwqe *wqe;
+ void (*handler)(struct ib_event *, void *);
+ struct ib_wc wc;
+ u32 tail;
+ u32 rlen;
+ u32 length;
+
+ qp = ipath_lookup_qpn(&dev->qp_table, swqe->ud_wr.remote_qpn);
+ if (!qp || !(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+
+ /*
+ * 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) swqe->ud_wr.remote_qkey < 0 ?
+ sqp->qkey : swqe->ud_wr.remote_qkey) != qp->qkey)) {
+ /* XXX OK to lose a count once in a while. */
+ dev->qkey_violations++;
+ dev->n_pkt_drops++;
+ goto drop;
+ }
+
+ /*
+ * A GRH is expected to precede 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;
+ }
+
+ /*
+ * This would be a lot simpler if we could call ipath_get_rwqe()
+ * but that uses state that the receive interrupt handler uses
+ * so we would need to lock out receive interrupts while doing
+ * local loopback.
+ */
+ if (qp->ibqp.srq) {
+ srq = to_isrq(qp->ibqp.srq);
+ handler = srq->ibsrq.event_handler;
+ rq = &srq->rq;
+ } else {
+ srq = NULL;
+ handler = NULL;
+ rq = &qp->r_rq;
+ }
+
+ /*
+ * 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.
+ */
+ spin_lock_irqsave(&rq->lock, flags);
+ wq = rq->wq;
+ tail = wq->tail;
+ /* Validate tail before using it since it is user writable. */
+ if (tail >= rq->size)
+ tail = 0;
+ if (unlikely(tail == wq->head)) {
+ spin_unlock_irqrestore(&rq->lock, flags);
+ dev->n_pkt_drops++;
+ goto drop;
+ }
+ wqe = get_rwqe_ptr(rq, tail);
+ rsge.sg_list = qp->r_ud_sg_list;
+ if (!ipath_init_sge(qp, wqe, &rlen, &rsge)) {
+ spin_unlock_irqrestore(&rq->lock, flags);
+ dev->n_pkt_drops++;
+ goto drop;
+ }
+ /* Silently drop packets which are too big. */
+ if (wc.byte_len > rlen) {
+ spin_unlock_irqrestore(&rq->lock, flags);
+ dev->n_pkt_drops++;
+ goto drop;
+ }
+ if (++tail >= rq->size)
+ tail = 0;
+ wq->tail = tail;
+ wc.wr_id = wqe->wr_id;
+ if (handler) {
+ u32 n;
+
+ /*
+ * validate head pointer value and compute
+ * the number of remaining WQEs.
+ */
+ n = wq->head;
+ if (n >= rq->size)
+ n = 0;
+ if (n < tail)
+ n += rq->size - tail;
+ else
+ n -= 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;
+ handler(&ev, srq->ibsrq.srq_context);
+ } else
+ spin_unlock_irqrestore(&rq->lock, flags);
+ } else
+ spin_unlock_irqrestore(&rq->lock, flags);
+
+ ah_attr = &to_iah(swqe->ud_wr.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 = swqe->sg_list;
+ while (length) {
+ u32 len = sge->length;
+
+ if (len > length)
+ len = length;
+ if (len > sge->sge_length)
+ len = sge->sge_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 (--swqe->wr.num_sge)
+ sge++;
+ } 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.qp = &qp->ibqp;
+ wc.src_qp = sqp->ibqp.qp_num;
+ /* XXX do we know which pkey matched? Only needed for GSI. */
+ wc.pkey_index = 0;
+ wc.slid = dev->dd->ipath_lid |
+ (ah_attr->src_path_bits &
+ ((1 << dev->dd->ipath_lmc) - 1));
+ wc.sl = ah_attr->sl;
+ wc.dlid_path_bits =
+ ah_attr->dlid & ((1 << dev->dd->ipath_lmc) - 1);
+ wc.port_num = 1;
+ /* Signal completion event if the solicited bit is set. */
+ ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
+ swqe->ud_wr.wr.send_flags & IB_SEND_SOLICITED);
+drop:
+ if (atomic_dec_and_test(&qp->refcount))
+ wake_up(&qp->wait);
+done:;
+}
+
+/**
+ * ipath_make_ud_req - construct a UD request packet
+ * @qp: the QP
+ *
+ * Return 1 if constructed; otherwise, return 0.
+ */
+int ipath_make_ud_req(struct ipath_qp *qp)
+{
+ struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
+ struct ipath_other_headers *ohdr;
+ struct ib_ah_attr *ah_attr;
+ struct ipath_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_ipath_state_ops[qp->state] & IPATH_PROCESS_NEXT_SEND_OK)) {
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_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 |= IPATH_S_WAIT_DMA;
+ goto bail;
+ }
+ wqe = get_swqe_ptr(qp, qp->s_last);
+ ipath_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. */
+ ah_attr = &to_iah(wqe->ud_wr.ah)->attr;
+ if (ah_attr->dlid >= IPATH_MULTICAST_LID_BASE) {
+ if (ah_attr->dlid != IPATH_PERMISSIVE_LID)
+ dev->n_multicast_xmit++;
+ else
+ dev->n_unicast_xmit++;
+ } else {
+ dev->n_unicast_xmit++;
+ lid = ah_attr->dlid & ~((1 << dev->dd->ipath_lmc) - 1);
+ if (unlikely(lid == dev->dd->ipath_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 |= IPATH_S_WAIT_DMA;
+ goto bail;
+ }
+ qp->s_cur = next_cur;
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ ipath_ud_loopback(qp, wqe);
+ spin_lock_irqsave(&qp->s_lock, flags);
+ ipath_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_dmult = 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->ud_wr.wr.num_sge;
+
+ if (ah_attr->ah_flags & IB_AH_GRH) {
+ /* Header size in 32-bit words. */
+ qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh,
+ &ah_attr->grh,
+ qp->s_hdrwords, nwords);
+ lrh0 = IPATH_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 = IPATH_LRH_BTH;
+ ohdr = &qp->s_hdr.u.oth;
+ }
+ if (wqe->ud_wr.wr.opcode == IB_WR_SEND_WITH_IMM) {
+ qp->s_hdrwords++;
+ ohdr->u.ud.imm_data = wqe->ud_wr.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) */
+ 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 = dev->dd->ipath_lid;
+ if (lid) {
+ lid |= ah_attr->src_path_bits &
+ ((1 << dev->dd->ipath_lmc) - 1);
+ qp->s_hdr.lrh[3] = cpu_to_be16(lid);
+ } else
+ qp->s_hdr.lrh[3] = IB_LID_PERMISSIVE;
+ if (wqe->ud_wr.wr.send_flags & IB_SEND_SOLICITED)
+ bth0 |= 1 << 23;
+ bth0 |= extra_bytes << 20;
+ bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? IPATH_DEFAULT_P_KEY :
+ ipath_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 >= IPATH_MULTICAST_LID_BASE &&
+ ah_attr->dlid != IPATH_PERMISSIVE_LID ?
+ cpu_to_be32(IPATH_MULTICAST_QPN) :
+ cpu_to_be32(wqe->ud_wr.remote_qpn);
+ ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & IPATH_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->ud_wr.remote_qkey < 0 ?
+ qp->qkey : wqe->ud_wr.remote_qkey);
+ ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
+
+done:
+ ret = 1;
+ goto unlock;
+
+bail:
+ qp->s_flags &= ~IPATH_S_BUSY;
+unlock:
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ 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;
+ struct ib_wc wc;
+ u32 qkey;
+ u32 src_qp;
+ 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 = dev->dd->ipath_rcvhdrentsize == 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 &= IPATH_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;
+ }
+ }
+
+ /*
+ * 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.ex.imm_data = *(__be32 *) data;
+ data += sizeof(__be32);
+ } else
+ 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 {
+ 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 precede the data even if not
+ * present on the wire.
+ */
+ wc.byte_len = tlen + sizeof(struct ib_grh);
+
+ /*
+ * Get the next work request entry to find where to put the data.
+ */
+ if (qp->r_flags & IPATH_R_REUSE_SGE)
+ qp->r_flags &= ~IPATH_R_REUSE_SGE;
+ else if (!ipath_get_rwqe(qp, 0)) {
+ /*
+ * Count VL15 packets dropped due to no receive buffer.
+ * Otherwise, count them as buffer overruns since usually,
+ * the HW will be able to receive packets even if there are
+ * no QPs with posted receive buffers.
+ */
+ if (qp->ibqp.qp_num == 0)
+ dev->n_vl15_dropped++;
+ else
+ dev->rcv_errors++;
+ goto bail;
+ }
+ /* Silently drop packets which are too big. */
+ if (wc.byte_len > qp->r_len) {
+ qp->r_flags |= IPATH_R_REUSE_SGE;
+ dev->n_pkt_drops++;
+ goto bail;
+ }
+ 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));
+ if (!test_and_clear_bit(IPATH_R_WRID_VALID, &qp->r_aflags))
+ goto bail;
+ 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;
+ /* 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 >= IPATH_MULTICAST_LID_BASE ? 0 :
+ dlid & ((1 << dev->dd->ipath_lmc) - 1);
+ wc.port_num = 1;
+ /* Signal completion event if the solicited bit is set. */
+ ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
+ (ohdr->bth[0] &
+ cpu_to_be32(1 << 23)) != 0);
+
+bail:;
+}
Code Review / kvmfornfv.git / blobdiff