/* * Copyright (c) 2006, 2007, 2008, 2009, 2010 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 <linux/err.h> #include <linux/vmalloc.h> #include <linux/jhash.h> #include "qib.h" #define BITS_PER_PAGE (PAGE_SIZE*BITS_PER_BYTE) #define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1) static inline unsigned mk_qpn(struct qib_qpn_table *qpt, struct qpn_map *map, unsigned off) { return (map - qpt->map) * BITS_PER_PAGE + off; } static inline unsigned find_next_offset(struct qib_qpn_table *qpt, struct qpn_map *map, unsigned off, unsigned n) { if (qpt->mask) { off++; if (((off & qpt->mask) >> 1) >= n) off = (off | qpt->mask) + 2; } else off = find_next_zero_bit(map->page, BITS_PER_PAGE, off); return off; } /* * Convert the AETH credit code into the number of credits. */ static u32 credit_table[31] = { 0, /* 0 */ 1, /* 1 */ 2, /* 2 */ 3, /* 3 */ 4, /* 4 */ 6, /* 5 */ 8, /* 6 */ 12, /* 7 */ 16, /* 8 */ 24, /* 9 */ 32, /* A */ 48, /* B */ 64, /* C */ 96, /* D */ 128, /* E */ 192, /* F */ 256, /* 10 */ 384, /* 11 */ 512, /* 12 */ 768, /* 13 */ 1024, /* 14 */ 1536, /* 15 */ 2048, /* 16 */ 3072, /* 17 */ 4096, /* 18 */ 6144, /* 19 */ 8192, /* 1A */ 12288, /* 1B */ 16384, /* 1C */ 24576, /* 1D */ 32768 /* 1E */ }; static void get_map_page(struct qib_qpn_table *qpt, struct qpn_map *map) { unsigned long page = get_zeroed_page(GFP_KERNEL); /* * Free the page if someone raced with us installing it. */ spin_lock(&qpt->lock); if (map->page) free_page(page); else map->page = (void *)page; spin_unlock(&qpt->lock); } /* * Allocate the next available QPN or * zero/one for QP type IB_QPT_SMI/IB_QPT_GSI. */ static int alloc_qpn(struct qib_devdata *dd, struct qib_qpn_table *qpt, enum ib_qp_type type, u8 port) { u32 i, offset, max_scan, qpn; struct qpn_map *map; u32 ret; if (type == IB_QPT_SMI || type == IB_QPT_GSI) { unsigned n; ret = type == IB_QPT_GSI; n = 1 << (ret + 2 * (port - 1)); spin_lock(&qpt->lock); if (qpt->flags & n) ret = -EINVAL; else qpt->flags |= n; spin_unlock(&qpt->lock); goto bail; } qpn = qpt->last + 2; if (qpn >= QPN_MAX) qpn = 2; if (qpt->mask && ((qpn & qpt->mask) >> 1) >= dd->n_krcv_queues) qpn = (qpn | qpt->mask) + 2; offset = qpn & BITS_PER_PAGE_MASK; map = &qpt->map[qpn / BITS_PER_PAGE]; max_scan = qpt->nmaps - !offset; for (i = 0;;) { if (unlikely(!map->page)) { get_map_page(qpt, map); if (unlikely(!map->page)) break; } do { if (!test_and_set_bit(offset, map->page)) { qpt->last = qpn; ret = qpn; goto bail; } offset = find_next_offset(qpt, map, offset, dd->n_krcv_queues); qpn = mk_qpn(qpt, map, offset); /* * This test differs from alloc_pidmap(). * If find_next_offset() does find a zero * bit, we don't need to check for QPN * wrapping around past our starting QPN. * We just need to be sure we don't loop * forever. */ } while (offset < BITS_PER_PAGE && qpn < QPN_MAX); /* * In order to keep the number of pages allocated to a * minimum, we scan the all existing pages before increasing * the size of the bitmap table. */ if (++i > max_scan) { if (qpt->nmaps == QPNMAP_ENTRIES) break; map = &qpt->map[qpt->nmaps++]; offset = 0; } else if (map < &qpt->map[qpt->nmaps]) { ++map; offset = 0; } else { map = &qpt->map[0]; offset = 2; } qpn = mk_qpn(qpt, map, offset); } ret = -ENOMEM; bail: return ret; } static void free_qpn(struct qib_qpn_table *qpt, u32 qpn) { struct qpn_map *map; map = qpt->map + qpn / BITS_PER_PAGE; if (map->page) clear_bit(qpn & BITS_PER_PAGE_MASK, map->page); } static inline unsigned qpn_hash(struct qib_ibdev *dev, u32 qpn) { return jhash_1word(qpn, dev->qp_rnd) & (dev->qp_table_size - 1); } /* * Put the QP into the hash table. * The hash table holds a reference to the QP. */ static void insert_qp(struct qib_ibdev *dev, struct qib_qp *qp) { struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); unsigned long flags; unsigned n = qpn_hash(dev, qp->ibqp.qp_num); spin_lock_irqsave(&dev->qpt_lock, flags); atomic_inc(&qp->refcount); if (qp->ibqp.qp_num == 0) rcu_assign_pointer(ibp->qp0, qp); else if (qp->ibqp.qp_num == 1) rcu_assign_pointer(ibp->qp1, qp); else { qp->next = dev->qp_table[n]; rcu_assign_pointer(dev->qp_table[n], qp); } spin_unlock_irqrestore(&dev->qpt_lock, flags); synchronize_rcu(); } /* * Remove the QP from the table so it can't be found asynchronously by * the receive interrupt routine. */ static void remove_qp(struct qib_ibdev *dev, struct qib_qp *qp) { struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); unsigned n = qpn_hash(dev, qp->ibqp.qp_num); unsigned long flags; spin_lock_irqsave(&dev->qpt_lock, flags); if (ibp->qp0 == qp) { atomic_dec(&qp->refcount); rcu_assign_pointer(ibp->qp0, NULL); } else if (ibp->qp1 == qp) { atomic_dec(&qp->refcount); rcu_assign_pointer(ibp->qp1, NULL); } else { struct qib_qp *q, **qpp; qpp = &dev->qp_table[n]; for (; (q = *qpp) != NULL; qpp = &q->next) if (q == qp) { atomic_dec(&qp->refcount); rcu_assign_pointer(*qpp, qp->next); qp->next = NULL; break; } } spin_unlock_irqrestore(&dev->qpt_lock, flags); synchronize_rcu(); } /** * qib_free_all_qps - check for QPs still in use * @qpt: the QP table to empty * * There should not be any QPs still in use. * Free memory for table. */ unsigned qib_free_all_qps(struct qib_devdata *dd) { struct qib_ibdev *dev = &dd->verbs_dev; unsigned long flags; struct qib_qp *qp; unsigned n, qp_inuse = 0; for (n = 0; n < dd->num_pports; n++) { struct qib_ibport *ibp = &dd->pport[n].ibport_data; if (!qib_mcast_tree_empty(ibp)) qp_inuse++; rcu_read_lock(); if (rcu_dereference(ibp->qp0)) qp_inuse++; if (rcu_dereference(ibp->qp1)) qp_inuse++; rcu_read_unlock(); } spin_lock_irqsave(&dev->qpt_lock, flags); for (n = 0; n < dev->qp_table_size; n++) { qp = dev->qp_table[n]; rcu_assign_pointer(dev->qp_table[n], NULL); for (; qp; qp = qp->next) qp_inuse++; } spin_unlock_irqrestore(&dev->qpt_lock, flags); synchronize_rcu(); return qp_inuse; } /** * qib_lookup_qpn - return the QP with the given QPN * @qpt: the QP table * @qpn: the QP number to look up * * The caller is responsible for decrementing the QP reference count * when done. */ struct qib_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn) { struct qib_qp *qp = NULL; if (unlikely(qpn <= 1)) { rcu_read_lock(); if (qpn == 0) qp = rcu_dereference(ibp->qp0); else qp = rcu_dereference(ibp->qp1); } else { struct qib_ibdev *dev = &ppd_from_ibp(ibp)->dd->verbs_dev; unsigned n = qpn_hash(dev, qpn); rcu_read_lock(); for (qp = dev->qp_table[n]; rcu_dereference(qp); qp = qp->next) if (qp->ibqp.qp_num == qpn) break; } if (qp) if (unlikely(!atomic_inc_not_zero(&qp->refcount))) qp = NULL; rcu_read_unlock(); return qp; } /** * qib_reset_qp - initialize the QP state to the reset state * @qp: the QP to reset * @type: the QP type */ static void qib_reset_qp(struct qib_qp *qp, enum ib_qp_type type) { qp->remote_qpn = 0; qp->qkey = 0; qp->qp_access_flags = 0; atomic_set(&qp->s_dma_busy, 0); qp->s_flags &= QIB_S_SIGNAL_REQ_WR; qp->s_hdrwords = 0; qp->s_wqe = NULL; qp->s_draining = 0; qp->s_next_psn = 0; qp->s_last_psn = 0; qp->s_sending_psn = 0; qp->s_sending_hpsn = 0; qp->s_psn = 0; qp->r_psn = 0; qp->r_msn = 0; if (type == IB_QPT_RC) { qp->s_state = IB_OPCODE_RC_SEND_LAST; qp->r_state = IB_OPCODE_RC_SEND_LAST; } else { qp->s_state = IB_OPCODE_UC_SEND_LAST; qp->r_state = IB_OPCODE_UC_SEND_LAST; } qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE; qp->r_nak_state = 0; qp->r_aflags = 0; qp->r_flags = 0; qp->s_head = 0; qp->s_tail = 0; qp->s_cur = 0; qp->s_acked = 0; qp->s_last = 0; qp->s_ssn = 1; qp->s_lsn = 0; qp->s_mig_state = IB_MIG_MIGRATED; memset(qp->s_ack_queue, 0, sizeof(qp->s_ack_queue)); qp->r_head_ack_queue = 0; qp->s_tail_ack_queue = 0; qp->s_num_rd_atomic = 0; if (qp->r_rq.wq) { qp->r_rq.wq->head = 0; qp->r_rq.wq->tail = 0; } qp->r_sge.num_sge = 0; } static void clear_mr_refs(struct qib_qp *qp, int clr_sends) { unsigned n; if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags)) while (qp->s_rdma_read_sge.num_sge) { atomic_dec(&qp->s_rdma_read_sge.sge.mr->refcount); if (--qp->s_rdma_read_sge.num_sge) qp->s_rdma_read_sge.sge = *qp->s_rdma_read_sge.sg_list++; } while (qp->r_sge.num_sge) { atomic_dec(&qp->r_sge.sge.mr->refcount); if (--qp->r_sge.num_sge) qp->r_sge.sge = *qp->r_sge.sg_list++; } if (clr_sends) { while (qp->s_last != qp->s_head) { struct qib_swqe *wqe = get_swqe_ptr(qp, qp->s_last); unsigned i; for (i = 0; i < wqe->wr.num_sge; i++) { struct qib_sge *sge = &wqe->sg_list[i]; atomic_dec(&sge->mr->refcount); } if (qp->ibqp.qp_type == IB_QPT_UD || qp->ibqp.qp_type == IB_QPT_SMI || qp->ibqp.qp_type == IB_QPT_GSI) atomic_dec(&to_iah(wqe->wr.wr.ud.ah)->refcount); if (++qp->s_last >= qp->s_size) qp->s_last = 0; } if (qp->s_rdma_mr) { atomic_dec(&qp->s_rdma_mr->refcount); qp->s_rdma_mr = NULL; } } if (qp->ibqp.qp_type != IB_QPT_RC) return; for (n = 0; n < ARRAY_SIZE(qp->s_ack_queue); n++) { struct qib_ack_entry *e = &qp->s_ack_queue[n]; if (e->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST && e->rdma_sge.mr) { atomic_dec(&e->rdma_sge.mr->refcount); e->rdma_sge.mr = NULL; } } } /** * qib_error_qp - put a QP into the error state * @qp: the QP to put into the error state * @err: the receive completion error to signal if a RWQE is active * * Flushes both send and receive work queues. * Returns true if last WQE event should be generated. * The QP r_lock and s_lock should be held and interrupts disabled. * If we are already in error state, just return. */ int qib_error_qp(struct qib_qp *qp, enum ib_wc_status err) { struct qib_ibdev *dev = to_idev(qp->ibqp.device); struct ib_wc wc; int ret = 0; if (qp->state == IB_QPS_ERR || qp->state == IB_QPS_RESET) goto bail; qp->state = IB_QPS_ERR; if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) { qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR); del_timer(&qp->s_timer); } if (qp->s_flags & QIB_S_ANY_WAIT_SEND) qp->s_flags &= ~QIB_S_ANY_WAIT_SEND; spin_lock(&dev->pending_lock); if (!list_empty(&qp->iowait) && !(qp->s_flags & QIB_S_BUSY)) { qp->s_flags &= ~QIB_S_ANY_WAIT_IO; list_del_init(&qp->iowait); } spin_unlock(&dev->pending_lock); if (!(qp->s_flags & QIB_S_BUSY)) { qp->s_hdrwords = 0; if (qp->s_rdma_mr) { atomic_dec(&qp->s_rdma_mr->refcount); qp->s_rdma_mr = NULL; } if (qp->s_tx) { qib_put_txreq(qp->s_tx); qp->s_tx = NULL; } } /* Schedule the sending tasklet to drain the send work queue. */ if (qp->s_last != qp->s_head) qib_schedule_send(qp); clear_mr_refs(qp, 0); memset(&wc, 0, sizeof(wc)); wc.qp = &qp->ibqp; wc.opcode = IB_WC_RECV; if (test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) { wc.wr_id = qp->r_wr_id; wc.status = err; qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); } wc.status = IB_WC_WR_FLUSH_ERR; if (qp->r_rq.wq) { struct qib_rwq *wq; u32 head; u32 tail; spin_lock(&qp->r_rq.lock); /* sanity check pointers before trusting them */ wq = qp->r_rq.wq; head = wq->head; if (head >= qp->r_rq.size) head = 0; tail = wq->tail; if (tail >= qp->r_rq.size) tail = 0; while (tail != head) { wc.wr_id = get_rwqe_ptr(&qp->r_rq, tail)->wr_id; if (++tail >= qp->r_rq.size) tail = 0; qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); } wq->tail = tail; spin_unlock(&qp->r_rq.lock); } else if (qp->ibqp.event_handler) ret = 1; bail: return ret; } /** * qib_modify_qp - modify the attributes of a queue pair * @ibqp: the queue pair who's attributes we're modifying * @attr: the new attributes * @attr_mask: the mask of attributes to modify * @udata: user data for libibverbs.so * * Returns 0 on success, otherwise returns an errno. */ int qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask, struct ib_udata *udata) { struct qib_ibdev *dev = to_idev(ibqp->device); struct qib_qp *qp = to_iqp(ibqp); enum ib_qp_state cur_state, new_state; struct ib_event ev; int lastwqe = 0; int mig = 0; int ret; u32 pmtu = 0; /* for gcc warning only */ spin_lock_irq(&qp->r_lock); spin_lock(&qp->s_lock); cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state; new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state; if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask)) goto inval; if (attr_mask & IB_QP_AV) { if (attr->ah_attr.dlid >= QIB_MULTICAST_LID_BASE) goto inval; if (qib_check_ah(qp->ibqp.device, &attr->ah_attr)) goto inval; } if (attr_mask & IB_QP_ALT_PATH) { if (attr->alt_ah_attr.dlid >= QIB_MULTICAST_LID_BASE) goto inval; if (qib_check_ah(qp->ibqp.device, &attr->alt_ah_attr)) goto inval; if (attr->alt_pkey_index >= qib_get_npkeys(dd_from_dev(dev))) goto inval; } if (attr_mask & IB_QP_PKEY_INDEX) if (attr->pkey_index >= qib_get_npkeys(dd_from_dev(dev))) goto inval; if (attr_mask & IB_QP_MIN_RNR_TIMER) if (attr->min_rnr_timer > 31) goto inval; if (attr_mask & IB_QP_PORT) if (qp->ibqp.qp_type == IB_QPT_SMI || qp->ibqp.qp_type == IB_QPT_GSI || attr->port_num == 0 || attr->port_num > ibqp->device->phys_port_cnt) goto inval; if (attr_mask & IB_QP_DEST_QPN) if (attr->dest_qp_num > QIB_QPN_MASK) goto inval; if (attr_mask & IB_QP_RETRY_CNT) if (attr->retry_cnt > 7) goto inval; if (attr_mask & IB_QP_RNR_RETRY) if (attr->rnr_retry > 7) goto inval; /* * Don't allow invalid path_mtu values. OK to set greater * than the active mtu (or even the max_cap, if we have tuned * that to a small mtu. We'll set qp->path_mtu * to the lesser of requested attribute mtu and active, * for packetizing messages. * Note that the QP port has to be set in INIT and MTU in RTR. */ if (attr_mask & IB_QP_PATH_MTU) { struct qib_devdata *dd = dd_from_dev(dev); int mtu, pidx = qp->port_num - 1; mtu = ib_mtu_enum_to_int(attr->path_mtu); if (mtu == -1) goto inval; if (mtu > dd->pport[pidx].ibmtu) { switch (dd->pport[pidx].ibmtu) { case 4096: pmtu = IB_MTU_4096; break; case 2048: pmtu = IB_MTU_2048; break; case 1024: pmtu = IB_MTU_1024; break; case 512: pmtu = IB_MTU_512; break; case 256: pmtu = IB_MTU_256; break; default: pmtu = IB_MTU_2048; } } else pmtu = attr->path_mtu; } if (attr_mask & IB_QP_PATH_MIG_STATE) { if (attr->path_mig_state == IB_MIG_REARM) { if (qp->s_mig_state == IB_MIG_ARMED) goto inval; if (new_state != IB_QPS_RTS) goto inval; } else if (attr->path_mig_state == IB_MIG_MIGRATED) { if (qp->s_mig_state == IB_MIG_REARM) goto inval; if (new_state != IB_QPS_RTS && new_state != IB_QPS_SQD) goto inval; if (qp->s_mig_state == IB_MIG_ARMED) mig = 1; } else goto inval; } if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) if (attr->max_dest_rd_atomic > QIB_MAX_RDMA_ATOMIC) goto inval; switch (new_state) { case IB_QPS_RESET: if (qp->state != IB_QPS_RESET) { qp->state = IB_QPS_RESET; spin_lock(&dev->pending_lock); if (!list_empty(&qp->iowait)) list_del_init(&qp->iowait); spin_unlock(&dev->pending_lock); qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT); spin_unlock(&qp->s_lock); spin_unlock_irq(&qp->r_lock); /* Stop the sending work queue and retry timer */ cancel_work_sync(&qp->s_work); del_timer_sync(&qp->s_timer); wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy)); if (qp->s_tx) { qib_put_txreq(qp->s_tx); qp->s_tx = NULL; } remove_qp(dev, qp); wait_event(qp->wait, !atomic_read(&qp->refcount)); spin_lock_irq(&qp->r_lock); spin_lock(&qp->s_lock); clear_mr_refs(qp, 1); qib_reset_qp(qp, ibqp->qp_type); } break; case IB_QPS_RTR: /* Allow event to retrigger if QP set to RTR more than once */ qp->r_flags &= ~QIB_R_COMM_EST; qp->state = new_state; break; case IB_QPS_SQD: qp->s_draining = qp->s_last != qp->s_cur; qp->state = new_state; break; case IB_QPS_SQE: if (qp->ibqp.qp_type == IB_QPT_RC) goto inval; qp->state = new_state; break; case IB_QPS_ERR: lastwqe = qib_error_qp(qp, IB_WC_WR_FLUSH_ERR); break; default: qp->state = new_state; break; } if (attr_mask & IB_QP_PKEY_INDEX) qp->s_pkey_index = attr->pkey_index; if (attr_mask & IB_QP_PORT) qp->port_num = attr->port_num; if (attr_mask & IB_QP_DEST_QPN) qp->remote_qpn = attr->dest_qp_num; if (attr_mask & IB_QP_SQ_PSN) { qp->s_next_psn = attr->sq_psn & QIB_PSN_MASK; qp->s_psn = qp->s_next_psn; qp->s_sending_psn = qp->s_next_psn; qp->s_last_psn = qp->s_next_psn - 1; qp->s_sending_hpsn = qp->s_last_psn; } if (attr_mask & IB_QP_RQ_PSN) qp->r_psn = attr->rq_psn & QIB_PSN_MASK; if (attr_mask & IB_QP_ACCESS_FLAGS) qp->qp_access_flags = attr->qp_access_flags; if (attr_mask & IB_QP_AV) { qp->remote_ah_attr = attr->ah_attr; qp->s_srate = attr->ah_attr.static_rate; } if (attr_mask & IB_QP_ALT_PATH) { qp->alt_ah_attr = attr->alt_ah_attr; qp->s_alt_pkey_index = attr->alt_pkey_index; } if (attr_mask & IB_QP_PATH_MIG_STATE) { qp->s_mig_state = attr->path_mig_state; if (mig) { qp->remote_ah_attr = qp->alt_ah_attr; qp->port_num = qp->alt_ah_attr.port_num; qp->s_pkey_index = qp->s_alt_pkey_index; } } if (attr_mask & IB_QP_PATH_MTU) { qp->path_mtu = pmtu; qp->pmtu = ib_mtu_enum_to_int(pmtu); } if (attr_mask & IB_QP_RETRY_CNT) { qp->s_retry_cnt = attr->retry_cnt; qp->s_retry = attr->retry_cnt; } if (attr_mask & IB_QP_RNR_RETRY) { qp->s_rnr_retry_cnt = attr->rnr_retry; qp->s_rnr_retry = attr->rnr_retry; } if (attr_mask & IB_QP_MIN_RNR_TIMER) qp->r_min_rnr_timer = attr->min_rnr_timer; if (attr_mask & IB_QP_TIMEOUT) { qp->timeout = attr->timeout; qp->timeout_jiffies = usecs_to_jiffies((4096UL * (1UL << qp->timeout)) / 1000UL); } if (attr_mask & IB_QP_QKEY) qp->qkey = attr->qkey; if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) qp->r_max_rd_atomic = attr->max_dest_rd_atomic; if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) qp->s_max_rd_atomic = attr->max_rd_atomic; spin_unlock(&qp->s_lock); spin_unlock_irq(&qp->r_lock); if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) insert_qp(dev, qp); if (lastwqe) { ev.device = qp->ibqp.device; ev.element.qp = &qp->ibqp; ev.event = IB_EVENT_QP_LAST_WQE_REACHED; qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); } if (mig) { ev.device = qp->ibqp.device; ev.element.qp = &qp->ibqp; ev.event = IB_EVENT_PATH_MIG; qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); } ret = 0; goto bail; inval: spin_unlock(&qp->s_lock); spin_unlock_irq(&qp->r_lock); ret = -EINVAL; bail: return ret; } int qib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask, struct ib_qp_init_attr *init_attr) { struct qib_qp *qp = to_iqp(ibqp); attr->qp_state = qp->state; attr->cur_qp_state = attr->qp_state; attr->path_mtu = qp->path_mtu; attr->path_mig_state = qp->s_mig_state; attr->qkey = qp->qkey; attr->rq_psn = qp->r_psn & QIB_PSN_MASK; attr->sq_psn = qp->s_next_psn & QIB_PSN_MASK; attr->dest_qp_num = qp->remote_qpn; attr->qp_access_flags = qp->qp_access_flags; attr->cap.max_send_wr = qp->s_size - 1; attr->cap.max_recv_wr = qp->ibqp.srq ? 0 : qp->r_rq.size - 1; attr->cap.max_send_sge = qp->s_max_sge; attr->cap.max_recv_sge = qp->r_rq.max_sge; attr->cap.max_inline_data = 0; attr->ah_attr = qp->remote_ah_attr; attr->alt_ah_attr = qp->alt_ah_attr; attr->pkey_index = qp->s_pkey_index; attr->alt_pkey_index = qp->s_alt_pkey_index; attr->en_sqd_async_notify = 0; attr->sq_draining = qp->s_draining; attr->max_rd_atomic = qp->s_max_rd_atomic; attr->max_dest_rd_atomic = qp->r_max_rd_atomic; attr->min_rnr_timer = qp->r_min_rnr_timer; attr->port_num = qp->port_num; attr->timeout = qp->timeout; attr->retry_cnt = qp->s_retry_cnt; attr->rnr_retry = qp->s_rnr_retry_cnt; attr->alt_port_num = qp->alt_ah_attr.port_num; attr->alt_timeout = qp->alt_timeout; init_attr->event_handler = qp->ibqp.event_handler; init_attr->qp_context = qp->ibqp.qp_context; init_attr->send_cq = qp->ibqp.send_cq; init_attr->recv_cq = qp->ibqp.recv_cq; init_attr->srq = qp->ibqp.srq; init_attr->cap = attr->cap; if (qp->s_flags & QIB_S_SIGNAL_REQ_WR) init_attr->sq_sig_type = IB_SIGNAL_REQ_WR; else init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; init_attr->qp_type = qp->ibqp.qp_type; init_attr->port_num = qp->port_num; return 0; } /** * qib_compute_aeth - compute the AETH (syndrome + MSN) * @qp: the queue pair to compute the AETH for * * Returns the AETH. */ __be32 qib_compute_aeth(struct qib_qp *qp) { u32 aeth = qp->r_msn & QIB_MSN_MASK; if (qp->ibqp.srq) { /* * Shared receive queues don't generate credits. * Set the credit field to the invalid value. */ aeth |= QIB_AETH_CREDIT_INVAL << QIB_AETH_CREDIT_SHIFT; } else { u32 min, max, x; u32 credits; struct qib_rwq *wq = qp->r_rq.wq; u32 head; u32 tail; /* sanity check pointers before trusting them */ head = wq->head; if (head >= qp->r_rq.size) head = 0; tail = wq->tail; if (tail >= qp->r_rq.size) tail = 0; /* * Compute the number of credits available (RWQEs). * XXX Not holding the r_rq.lock here so there is a small * chance that the pair of reads are not atomic. */ credits = head - tail; if ((int)credits < 0) credits += qp->r_rq.size; /* * Binary search the credit table to find the code to * use. */ min = 0; max = 31; for (;;) { x = (min + max) / 2; if (credit_table[x] == credits) break; if (credit_table[x] > credits) max = x; else if (min == x) break; else min = x; } aeth |= x << QIB_AETH_CREDIT_SHIFT; } return cpu_to_be32(aeth); } /** * qib_create_qp - create a queue pair for a device * @ibpd: the protection domain who's device we create the queue pair for * @init_attr: the attributes of the queue pair * @udata: user data for libibverbs.so * * Returns the queue pair on success, otherwise returns an errno. * * Called by the ib_create_qp() core verbs function. */ struct ib_qp *qib_create_qp(struct ib_pd *ibpd, struct ib_qp_init_attr *init_attr, struct ib_udata *udata) { struct qib_qp *qp; int err; struct qib_swqe *swq = NULL; struct qib_ibdev *dev; struct qib_devdata *dd; size_t sz; size_t sg_list_sz; struct ib_qp *ret; if (init_attr->cap.max_send_sge > ib_qib_max_sges || init_attr->cap.max_send_wr > ib_qib_max_qp_wrs) { ret = ERR_PTR(-EINVAL); goto bail; } /* Check receive queue parameters if no SRQ is specified. */ if (!init_attr->srq) { if (init_attr->cap.max_recv_sge > ib_qib_max_sges || init_attr->cap.max_recv_wr > ib_qib_max_qp_wrs) { ret = ERR_PTR(-EINVAL); goto bail; } if (init_attr->cap.max_send_sge + init_attr->cap.max_send_wr + init_attr->cap.max_recv_sge + init_attr->cap.max_recv_wr == 0) { ret = ERR_PTR(-EINVAL); goto bail; } } switch (init_attr->qp_type) { case IB_QPT_SMI: case IB_QPT_GSI: if (init_attr->port_num == 0 || init_attr->port_num > ibpd->device->phys_port_cnt) { ret = ERR_PTR(-EINVAL); goto bail; } case IB_QPT_UC: case IB_QPT_RC: case IB_QPT_UD: sz = sizeof(struct qib_sge) * init_attr->cap.max_send_sge + sizeof(struct qib_swqe); swq = vmalloc((init_attr->cap.max_send_wr + 1) * sz); if (swq == NULL) { ret = ERR_PTR(-ENOMEM); goto bail; } sz = sizeof(*qp); sg_list_sz = 0; if (init_attr->srq) { struct qib_srq *srq = to_isrq(init_attr->srq); if (srq->rq.max_sge > 1) sg_list_sz = sizeof(*qp->r_sg_list) * (srq->rq.max_sge - 1); } else if (init_attr->cap.max_recv_sge > 1) sg_list_sz = sizeof(*qp->r_sg_list) * (init_attr->cap.max_recv_sge - 1); qp = kzalloc(sz + sg_list_sz, GFP_KERNEL); if (!qp) { ret = ERR_PTR(-ENOMEM); goto bail_swq; } RCU_INIT_POINTER(qp->next, NULL); qp->timeout_jiffies = usecs_to_jiffies((4096UL * (1UL << qp->timeout)) / 1000UL); if (init_attr->srq) sz = 0; else { qp->r_rq.size = init_attr->cap.max_recv_wr + 1; qp->r_rq.max_sge = init_attr->cap.max_recv_sge; sz = (sizeof(struct ib_sge) * qp->r_rq.max_sge) + sizeof(struct qib_rwqe); qp->r_rq.wq = vmalloc_user(sizeof(struct qib_rwq) + qp->r_rq.size * sz); if (!qp->r_rq.wq) { ret = ERR_PTR(-ENOMEM); goto bail_qp; } } /* * ib_create_qp() will initialize qp->ibqp * except for qp->ibqp.qp_num. */ spin_lock_init(&qp->r_lock); spin_lock_init(&qp->s_lock); spin_lock_init(&qp->r_rq.lock); atomic_set(&qp->refcount, 0); init_waitqueue_head(&qp->wait); init_waitqueue_head(&qp->wait_dma); init_timer(&qp->s_timer); qp->s_timer.data = (unsigned long)qp; INIT_WORK(&qp->s_work, qib_do_send); INIT_LIST_HEAD(&qp->iowait); INIT_LIST_HEAD(&qp->rspwait); qp->state = IB_QPS_RESET; qp->s_wq = swq; qp->s_size = init_attr->cap.max_send_wr + 1; qp->s_max_sge = init_attr->cap.max_send_sge; if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR) qp->s_flags = QIB_S_SIGNAL_REQ_WR; dev = to_idev(ibpd->device); dd = dd_from_dev(dev); err = alloc_qpn(dd, &dev->qpn_table, init_attr->qp_type, init_attr->port_num); if (err < 0) { ret = ERR_PTR(err); vfree(qp->r_rq.wq); goto bail_qp; } qp->ibqp.qp_num = err; qp->port_num = init_attr->port_num; qib_reset_qp(qp, init_attr->qp_type); break; default: /* Don't support raw QPs */ ret = ERR_PTR(-ENOSYS); goto bail; } init_attr->cap.max_inline_data = 0; /* * Return the address of the RWQ as the offset to mmap. * See qib_mmap() for details. */ if (udata && udata->outlen >= sizeof(__u64)) { if (!qp->r_rq.wq) { __u64 offset = 0; err = ib_copy_to_udata(udata, &offset, sizeof(offset)); if (err) { ret = ERR_PTR(err); goto bail_ip; } } else { u32 s = sizeof(struct qib_rwq) + qp->r_rq.size * sz; qp->ip = qib_create_mmap_info(dev, s, ibpd->uobject->context, qp->r_rq.wq); if (!qp->ip) { ret = ERR_PTR(-ENOMEM); goto bail_ip; } err = ib_copy_to_udata(udata, &(qp->ip->offset), sizeof(qp->ip->offset)); if (err) { ret = ERR_PTR(err); goto bail_ip; } } } spin_lock(&dev->n_qps_lock); if (dev->n_qps_allocated == ib_qib_max_qps) { spin_unlock(&dev->n_qps_lock); ret = ERR_PTR(-ENOMEM); goto bail_ip; } dev->n_qps_allocated++; spin_unlock(&dev->n_qps_lock); if (qp->ip) { spin_lock_irq(&dev->pending_lock); list_add(&qp->ip->pending_mmaps, &dev->pending_mmaps); spin_unlock_irq(&dev->pending_lock); } ret = &qp->ibqp; goto bail; bail_ip: if (qp->ip) kref_put(&qp->ip->ref, qib_release_mmap_info); else vfree(qp->r_rq.wq); free_qpn(&dev->qpn_table, qp->ibqp.qp_num); bail_qp: kfree(qp); bail_swq: vfree(swq); bail: return ret; } /** * qib_destroy_qp - destroy a queue pair * @ibqp: the queue pair to destroy * * Returns 0 on success. * * Note that this can be called while the QP is actively sending or * receiving! */ int qib_destroy_qp(struct ib_qp *ibqp) { struct qib_qp *qp = to_iqp(ibqp); struct qib_ibdev *dev = to_idev(ibqp->device); /* Make sure HW and driver activity is stopped. */ spin_lock_irq(&qp->s_lock); if (qp->state != IB_QPS_RESET) { qp->state = IB_QPS_RESET; spin_lock(&dev->pending_lock); if (!list_empty(&qp->iowait)) list_del_init(&qp->iowait); spin_unlock(&dev->pending_lock); qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT); spin_unlock_irq(&qp->s_lock); cancel_work_sync(&qp->s_work); del_timer_sync(&qp->s_timer); wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy)); if (qp->s_tx) { qib_put_txreq(qp->s_tx); qp->s_tx = NULL; } remove_qp(dev, qp); wait_event(qp->wait, !atomic_read(&qp->refcount)); clear_mr_refs(qp, 1); } else spin_unlock_irq(&qp->s_lock); /* all user's cleaned up, mark it available */ free_qpn(&dev->qpn_table, qp->ibqp.qp_num); spin_lock(&dev->n_qps_lock); dev->n_qps_allocated--; spin_unlock(&dev->n_qps_lock); if (qp->ip) kref_put(&qp->ip->ref, qib_release_mmap_info); else vfree(qp->r_rq.wq); vfree(qp->s_wq); kfree(qp); return 0; } /** * qib_init_qpn_table - initialize the QP number table for a device * @qpt: the QPN table */ void qib_init_qpn_table(struct qib_devdata *dd, struct qib_qpn_table *qpt) { spin_lock_init(&qpt->lock); qpt->last = 1; /* start with QPN 2 */ qpt->nmaps = 1; qpt->mask = dd->qpn_mask; } /** * qib_free_qpn_table - free the QP number table for a device * @qpt: the QPN table */ void qib_free_qpn_table(struct qib_qpn_table *qpt) { int i; for (i = 0; i < ARRAY_SIZE(qpt->map); i++) if (qpt->map[i].page) free_page((unsigned long) qpt->map[i].page); } /** * qib_get_credit - flush the send work queue of a QP * @qp: the qp who's send work queue to flush * @aeth: the Acknowledge Extended Transport Header * * The QP s_lock should be held. */ void qib_get_credit(struct qib_qp *qp, u32 aeth) { u32 credit = (aeth >> QIB_AETH_CREDIT_SHIFT) & QIB_AETH_CREDIT_MASK; /* * If the credit is invalid, we can send * as many packets as we like. Otherwise, we have to * honor the credit field. */ if (credit == QIB_AETH_CREDIT_INVAL) { if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) { qp->s_flags |= QIB_S_UNLIMITED_CREDIT; if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) { qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT; qib_schedule_send(qp); } } } else if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) { /* Compute new LSN (i.e., MSN + credit) */ credit = (aeth + credit_table[credit]) & QIB_MSN_MASK; if (qib_cmp24(credit, qp->s_lsn) > 0) { qp->s_lsn = credit; if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) { qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT; qib_schedule_send(qp); } } } }