/* * 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" /* * Convert the AETH RNR timeout code into the number of milliseconds. */ const u32 ib_ipath_rnr_table[32] = { 656, /* 0 */ 1, /* 1 */ 1, /* 2 */ 1, /* 3 */ 1, /* 4 */ 1, /* 5 */ 1, /* 6 */ 1, /* 7 */ 1, /* 8 */ 1, /* 9 */ 1, /* A */ 1, /* B */ 1, /* C */ 1, /* D */ 2, /* E */ 2, /* F */ 3, /* 10 */ 4, /* 11 */ 6, /* 12 */ 8, /* 13 */ 11, /* 14 */ 16, /* 15 */ 21, /* 16 */ 31, /* 17 */ 41, /* 18 */ 62, /* 19 */ 82, /* 1A */ 123, /* 1B */ 164, /* 1C */ 246, /* 1D */ 328, /* 1E */ 492 /* 1F */ }; /** * ipath_insert_rnr_queue - put QP on the RNR timeout list for the device * @qp: the QP * * XXX Use a simple list for now. We might need a priority * queue if we have lots of QPs waiting for RNR timeouts * but that should be rare. */ void ipath_insert_rnr_queue(struct ipath_qp *qp) { struct ipath_ibdev *dev = to_idev(qp->ibqp.device); unsigned long flags; spin_lock_irqsave(&dev->pending_lock, flags); if (list_empty(&dev->rnrwait)) list_add(&qp->timerwait, &dev->rnrwait); else { struct list_head *l = &dev->rnrwait; struct ipath_qp *nqp = list_entry(l->next, struct ipath_qp, timerwait); while (qp->s_rnr_timeout >= nqp->s_rnr_timeout) { qp->s_rnr_timeout -= nqp->s_rnr_timeout; l = l->next; if (l->next == &dev->rnrwait) { nqp = NULL; break; } nqp = list_entry(l->next, struct ipath_qp, timerwait); } if (nqp) nqp->s_rnr_timeout -= qp->s_rnr_timeout; list_add(&qp->timerwait, l); } spin_unlock_irqrestore(&dev->pending_lock, flags); } /** * ipath_init_sge - Validate a RWQE and fill in the SGE state * @qp: the QP * * Return 1 if OK. */ int ipath_init_sge(struct ipath_qp *qp, struct ipath_rwqe *wqe, u32 *lengthp, struct ipath_sge_state *ss) { int i, j, ret; struct ib_wc wc; *lengthp = 0; for (i = j = 0; i < wqe->num_sge; i++) { if (wqe->sg_list[i].length == 0) continue; /* Check LKEY */ if (!ipath_lkey_ok(qp, j ? &ss->sg_list[j - 1] : &ss->sge, &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE)) goto bad_lkey; *lengthp += wqe->sg_list[i].length; j++; } ss->num_sge = j; ret = 1; goto bail; bad_lkey: memset(&wc, 0, sizeof(wc)); wc.wr_id = wqe->wr_id; wc.status = IB_WC_LOC_PROT_ERR; wc.opcode = IB_WC_RECV; wc.qp = &qp->ibqp; /* Signal solicited completion event. */ ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); ret = 0; bail: return ret; } /** * ipath_get_rwqe - copy the next RWQE into the QP's RWQE * @qp: the QP * @wr_id_only: update wr_id only, not SGEs * * Return 0 if no RWQE is available, otherwise return 1. * * Can be called from interrupt level. */ int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only) { unsigned long flags; struct ipath_rq *rq; struct ipath_rwq *wq; struct ipath_srq *srq; struct ipath_rwqe *wqe; void (*handler)(struct ib_event *, void *); u32 tail; int ret; qp->r_sge.sg_list = qp->r_sg_list; 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; } 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; do { if (unlikely(tail == wq->head)) { spin_unlock_irqrestore(&rq->lock, flags); ret = 0; goto bail; } /* Make sure entry is read after head index is read. */ smp_rmb(); wqe = get_rwqe_ptr(rq, tail); if (++tail >= rq->size) tail = 0; } while (!wr_id_only && !ipath_init_sge(qp, wqe, &qp->r_len, &qp->r_sge)); qp->r_wr_id = wqe->wr_id; wq->tail = tail; ret = 1; qp->r_wrid_valid = 1; 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); goto bail; } } spin_unlock_irqrestore(&rq->lock, flags); bail: return ret; } /** * ipath_ruc_loopback - handle UC and RC lookback requests * @sqp: the sending QP * * This is called from ipath_do_send() to * forward a WQE addressed to the same HCA. * Note that although we are single threaded due to the tasklet, we still * have to protect against post_send(). We don't have to worry about * receive interrupts since this is a connected protocol and all packets * will pass through here. */ static void ipath_ruc_loopback(struct ipath_qp *sqp) { struct ipath_ibdev *dev = to_idev(sqp->ibqp.device); struct ipath_qp *qp; struct ipath_swqe *wqe; struct ipath_sge *sge; unsigned long flags; struct ib_wc wc; u64 sdata; atomic64_t *maddr; enum ib_wc_status send_status; qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn); if (!qp) { dev->n_pkt_drops++; return; } again: spin_lock_irqsave(&sqp->s_lock, flags); if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_SEND_OK) || sqp->s_rnr_timeout) { spin_unlock_irqrestore(&sqp->s_lock, flags); goto done; } /* Get the next send request. */ if (sqp->s_last == sqp->s_head) { /* Send work queue is empty. */ spin_unlock_irqrestore(&sqp->s_lock, flags); goto done; } /* * We can rely on the entry not changing without the s_lock * being held until we update s_last. */ wqe = get_swqe_ptr(sqp, sqp->s_last); spin_unlock_irqrestore(&sqp->s_lock, flags); memset(&wc, 0, sizeof wc); send_status = IB_WC_SUCCESS; sqp->s_sge.sge = wqe->sg_list[0]; sqp->s_sge.sg_list = wqe->sg_list + 1; sqp->s_sge.num_sge = wqe->wr.num_sge; sqp->s_len = wqe->length; switch (wqe->wr.opcode) { case IB_WR_SEND_WITH_IMM: wc.wc_flags = IB_WC_WITH_IMM; wc.imm_data = wqe->wr.ex.imm_data; /* FALLTHROUGH */ case IB_WR_SEND: if (!ipath_get_rwqe(qp, 0)) goto rnr_nak; break; case IB_WR_RDMA_WRITE_WITH_IMM: if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) goto inv_err; wc.wc_flags = IB_WC_WITH_IMM; wc.imm_data = wqe->wr.ex.imm_data; if (!ipath_get_rwqe(qp, 1)) goto rnr_nak; /* FALLTHROUGH */ case IB_WR_RDMA_WRITE: if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) goto inv_err; if (wqe->length == 0) break; if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, wqe->length, wqe->wr.wr.rdma.remote_addr, wqe->wr.wr.rdma.rkey, IB_ACCESS_REMOTE_WRITE))) goto acc_err; break; case IB_WR_RDMA_READ: if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) goto inv_err; if (unlikely(!ipath_rkey_ok(qp, &sqp->s_sge, wqe->length, wqe->wr.wr.rdma.remote_addr, wqe->wr.wr.rdma.rkey, IB_ACCESS_REMOTE_READ))) goto acc_err; qp->r_sge.sge = wqe->sg_list[0]; qp->r_sge.sg_list = wqe->sg_list + 1; qp->r_sge.num_sge = wqe->wr.num_sge; break; case IB_WR_ATOMIC_CMP_AND_SWP: case IB_WR_ATOMIC_FETCH_AND_ADD: if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) goto inv_err; if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, sizeof(u64), wqe->wr.wr.atomic.remote_addr, wqe->wr.wr.atomic.rkey, IB_ACCESS_REMOTE_ATOMIC))) goto acc_err; /* Perform atomic OP and save result. */ maddr = (atomic64_t *) qp->r_sge.sge.vaddr; sdata = wqe->wr.wr.atomic.compare_add; *(u64 *) sqp->s_sge.sge.vaddr = (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? (u64) atomic64_add_return(sdata, maddr) - sdata : (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, sdata, wqe->wr.wr.atomic.swap); goto send_comp; default: send_status = IB_WC_LOC_QP_OP_ERR; goto serr; } sge = &sqp->s_sge.sge; while (sqp->s_len) { u32 len = sqp->s_len; if (len > sge->length) len = sge->length; if (len > sge->sge_length) len = sge->sge_length; BUG_ON(len == 0); ipath_copy_sge(&qp->r_sge, sge->vaddr, len); sge->vaddr += len; sge->length -= len; sge->sge_length -= len; if (sge->sge_length == 0) { if (--sqp->s_sge.num_sge) *sge = *sqp->s_sge.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; } sqp->s_len -= len; } if (wqe->wr.opcode == IB_WR_RDMA_WRITE || wqe->wr.opcode == IB_WR_RDMA_READ) goto send_comp; if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; else wc.opcode = IB_WC_RECV; wc.wr_id = qp->r_wr_id; wc.status = IB_WC_SUCCESS; wc.byte_len = wqe->length; wc.qp = &qp->ibqp; wc.src_qp = qp->remote_qpn; wc.slid = qp->remote_ah_attr.dlid; wc.sl = qp->remote_ah_attr.sl; wc.port_num = 1; /* Signal completion event if the solicited bit is set. */ ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, wqe->wr.send_flags & IB_SEND_SOLICITED); send_comp: sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; ipath_send_complete(sqp, wqe, send_status); goto again; rnr_nak: /* Handle RNR NAK */ if (qp->ibqp.qp_type == IB_QPT_UC) goto send_comp; /* * Note: we don't need the s_lock held since the BUSY flag * makes this single threaded. */ if (sqp->s_rnr_retry == 0) { send_status = IB_WC_RNR_RETRY_EXC_ERR; goto serr; } if (sqp->s_rnr_retry_cnt < 7) sqp->s_rnr_retry--; spin_lock_irqsave(&sqp->s_lock, flags); if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_RECV_OK)) goto unlock; dev->n_rnr_naks++; sqp->s_rnr_timeout = ib_ipath_rnr_table[qp->r_min_rnr_timer]; ipath_insert_rnr_queue(sqp); goto unlock; inv_err: send_status = IB_WC_REM_INV_REQ_ERR; wc.status = IB_WC_LOC_QP_OP_ERR; goto err; acc_err: send_status = IB_WC_REM_ACCESS_ERR; wc.status = IB_WC_LOC_PROT_ERR; err: /* responder goes to error state */ ipath_rc_error(qp, wc.status); serr: spin_lock_irqsave(&sqp->s_lock, flags); ipath_send_complete(sqp, wqe, send_status); if (sqp->ibqp.qp_type == IB_QPT_RC) { int lastwqe = ipath_error_qp(sqp, IB_WC_WR_FLUSH_ERR); sqp->s_flags &= ~IPATH_S_BUSY; spin_unlock_irqrestore(&sqp->s_lock, flags); if (lastwqe) { struct ib_event ev; ev.device = sqp->ibqp.device; ev.element.qp = &sqp->ibqp; ev.event = IB_EVENT_QP_LAST_WQE_REACHED; sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); } goto done; } unlock: spin_unlock_irqrestore(&sqp->s_lock, flags); done: if (atomic_dec_and_test(&qp->refcount)) wake_up(&qp->wait); } static void want_buffer(struct ipath_devdata *dd, struct ipath_qp *qp) { if (!(dd->ipath_flags & IPATH_HAS_SEND_DMA) || qp->ibqp.qp_type == IB_QPT_SMI) { unsigned long flags; spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags); dd->ipath_sendctrl |= INFINIPATH_S_PIOINTBUFAVAIL; ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, dd->ipath_sendctrl); ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch); spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags); } } /** * ipath_no_bufs_available - tell the layer driver we need buffers * @qp: the QP that caused the problem * @dev: the device we ran out of buffers on * * Called when we run out of PIO buffers. */ static void ipath_no_bufs_available(struct ipath_qp *qp, struct ipath_ibdev *dev) { unsigned long flags; /* * Note that as soon as want_buffer() is called and * possibly before it returns, ipath_ib_piobufavail() * could be called. If we are still in the tasklet function, * tasklet_hi_schedule() will not call us until the next time * tasklet_hi_schedule() is called. * We leave the busy flag set so that another post send doesn't * try to put the same QP on the piowait list again. */ spin_lock_irqsave(&dev->pending_lock, flags); list_add_tail(&qp->piowait, &dev->piowait); spin_unlock_irqrestore(&dev->pending_lock, flags); want_buffer(dev->dd, qp); dev->n_piowait++; } /** * ipath_make_grh - construct a GRH header * @dev: a pointer to the ipath device * @hdr: a pointer to the GRH header being constructed * @grh: the global route address to send to * @hwords: the number of 32 bit words of header being sent * @nwords: the number of 32 bit words of data being sent * * Return the size of the header in 32 bit words. */ u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr, struct ib_global_route *grh, u32 hwords, u32 nwords) { hdr->version_tclass_flow = cpu_to_be32((6 << 28) | (grh->traffic_class << 20) | grh->flow_label); hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); /* next_hdr is defined by C8-7 in ch. 8.4.1 */ hdr->next_hdr = 0x1B; hdr->hop_limit = grh->hop_limit; /* The SGID is 32-bit aligned. */ hdr->sgid.global.subnet_prefix = dev->gid_prefix; hdr->sgid.global.interface_id = dev->dd->ipath_guid; hdr->dgid = grh->dgid; /* GRH header size in 32-bit words. */ return sizeof(struct ib_grh) / sizeof(u32); } void ipath_make_ruc_header(struct ipath_ibdev *dev, struct ipath_qp *qp, struct ipath_other_headers *ohdr, u32 bth0, u32 bth2) { u16 lrh0; u32 nwords; u32 extra_bytes; /* Construct the header. */ extra_bytes = -qp->s_cur_size & 3; nwords = (qp->s_cur_size + extra_bytes) >> 2; lrh0 = IPATH_LRH_BTH; if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh, &qp->remote_ah_attr.grh, qp->s_hdrwords, nwords); lrh0 = IPATH_LRH_GRH; } lrh0 |= qp->remote_ah_attr.sl << 4; qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); qp->s_hdr.lrh[3] = cpu_to_be16(dev->dd->ipath_lid); bth0 |= ipath_get_pkey(dev->dd, qp->s_pkey_index); bth0 |= extra_bytes << 20; ohdr->bth[0] = cpu_to_be32(bth0 | (1 << 22)); ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); ohdr->bth[2] = cpu_to_be32(bth2); } /** * ipath_do_send - perform a send on a QP * @data: contains a pointer to the QP * * Process entries in the send work queue until credit or queue is * exhausted. Only allow one CPU to send a packet per QP (tasklet). * Otherwise, two threads could send packets out of order. */ void ipath_do_send(unsigned long data) { struct ipath_qp *qp = (struct ipath_qp *)data; struct ipath_ibdev *dev = to_idev(qp->ibqp.device); int (*make_req)(struct ipath_qp *qp); if (test_and_set_bit(IPATH_S_BUSY, &qp->s_busy)) goto bail; if ((qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) && qp->remote_ah_attr.dlid == dev->dd->ipath_lid) { ipath_ruc_loopback(qp); goto clear; } if (qp->ibqp.qp_type == IB_QPT_RC) make_req = ipath_make_rc_req; else if (qp->ibqp.qp_type == IB_QPT_UC) make_req = ipath_make_uc_req; else make_req = ipath_make_ud_req; again: /* Check for a constructed packet to be sent. */ if (qp->s_hdrwords != 0) { /* * If no PIO bufs are available, return. An interrupt will * call ipath_ib_piobufavail() when one is available. */ if (ipath_verbs_send(qp, &qp->s_hdr, qp->s_hdrwords, qp->s_cur_sge, qp->s_cur_size)) { ipath_no_bufs_available(qp, dev); goto bail; } dev->n_unicast_xmit++; /* Record that we sent the packet and s_hdr is empty. */ qp->s_hdrwords = 0; } if (make_req(qp)) goto again; clear: clear_bit(IPATH_S_BUSY, &qp->s_busy); bail:; } void ipath_send_complete(struct ipath_qp *qp, struct ipath_swqe *wqe, enum ib_wc_status status) { unsigned long flags; u32 last; /* See ch. 11.2.4.1 and 10.7.3.1 */ if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) || (wqe->wr.send_flags & IB_SEND_SIGNALED) || status != IB_WC_SUCCESS) { struct ib_wc wc; memset(&wc, 0, sizeof wc); wc.wr_id = wqe->wr.wr_id; wc.status = status; wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; wc.qp = &qp->ibqp; if (status == IB_WC_SUCCESS) wc.byte_len = wqe->length; ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, status != IB_WC_SUCCESS); } spin_lock_irqsave(&qp->s_lock, flags); last = qp->s_last; if (++last >= qp->s_size) last = 0; qp->s_last = last; spin_unlock_irqrestore(&qp->s_lock, flags); }