/* * 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 #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:; }