SIW: Object management

Message ID	1286261665-5175-1-git-send-email-bmt@zurich.ibm.com
State	Not Applicable, archived
Delegated to:	David Miller
Headers	show Return-Path: <netdev-owner@vger.kernel.org> From: Bernard Metzler <bmt@zurich.ibm.com> To: netdev@vger.kernel.org Cc: linux-rdma@vger.kernel.org, Bernard Metzler <bmt@zurich.ibm.com> Subject: [PATCH] SIW: Object management Date: Tue, 5 Oct 2010 08:54:25 +0200 Message-Id: <1286261665-5175-1-git-send-email-bmt@zurich.ibm.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk

diff --git a/drivers/infiniband/hw/siw/siw_obj.c b/drivers/infiniband/hw/siw/siw_obj.c new file mode 100644 index 0000000..b5a1a3d --- /dev/null +++ b/drivers/infiniband/hw/siw/siw_obj.c @@ -0,0 +1,499 @@ +/* + * Software iWARP device driver for Linux + * + * Authors: Bernard Metzler <bmt@zurich.ibm.com> + * + * Copyright (c) 2008-2010, IBM Corporation + * + * 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 + * 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. + * + * - Neither the name of IBM nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * 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/spinlock.h> +#include <linux/kref.h> + +#include "siw.h" +#include "siw_obj.h" +#include "siw_cm.h" + + +void siw_objhdr_init(struct siw_objhdr *hdr) +{ + kref_init(&hdr->ref); +} + +void siw_idr_init(struct siw_dev *dev) +{ + spin_lock_init(&dev->idr_lock); + + idr_init(&dev->qp_idr); + idr_init(&dev->cq_idr); + idr_init(&dev->pd_idr); + idr_init(&dev->mem_idr); +} + +void siw_idr_release(struct siw_dev *dev) +{ + idr_destroy(&dev->qp_idr); + idr_destroy(&dev->cq_idr); + idr_destroy(&dev->pd_idr); + idr_destroy(&dev->mem_idr); +} + +static inline int siw_add_obj(spinlock_t *lock, struct idr *idr, + struct siw_objhdr *obj) +{ + u32 pre_id, id; + unsigned long flags; + int rv; + + get_random_bytes(&pre_id, sizeof pre_id); + pre_id &= 0xffff; +again: + do { + if (!(idr_pre_get(idr, GFP_KERNEL))) + return -ENOMEM; + + spin_lock_irqsave(lock, flags); + rv = idr_get_new_above(idr, obj, pre_id, &id); + spin_unlock_irqrestore(lock, flags); + + } while (rv == -EAGAIN); + + if (rv == 0) { + siw_objhdr_init(obj); + obj->id = id; + dprint(DBG_OBJ, "(OBJ%d): IDR New Object\n", id); + } else if (rv == -ENOSPC && pre_id != 1) { + pre_id = 1; + goto again; + } else { + dprint(DBG_OBJ|DBG_ON, "(OBJ??): IDR New Object failed!\n"); + } + return rv; +} + +static inline struct siw_objhdr *siw_get_obj(struct idr *idr, int id) +{ + struct siw_objhdr *obj; + + obj = idr_find(idr, id); + if (obj) + kref_get(&obj->ref); + + return obj; +} + +struct siw_cq *siw_cq_id2obj(struct siw_dev *dev, int id) +{ + struct siw_objhdr *obj = siw_get_obj(&dev->cq_idr, id); + if (obj) + return container_of(obj, struct siw_cq, hdr); + + return NULL; +} + +struct siw_qp *siw_qp_id2obj(struct siw_dev *dev, int id) +{ + struct siw_objhdr *obj = siw_get_obj(&dev->qp_idr, id); + if (obj) + return container_of(obj, struct siw_qp, hdr); + + return NULL; +} + +/* + * siw_mem_id2obj() + * + * resolves memory from stag given by id. might be called from: + * o process context before sending out of sgl + * o or in softirq when resolving target memory + */ +struct siw_mem *siw_mem_id2obj(struct siw_dev *dev, int id) +{ + struct siw_objhdr *obj; + unsigned long flags; + + spin_lock_irqsave(&dev->idr_lock, flags); + obj = siw_get_obj(&dev->mem_idr, id); + spin_unlock_irqrestore(&dev->idr_lock, flags); + + if (obj) { + dprint(DBG_MM|DBG_OBJ, "(MEM%d): New refcount: %d\n", + obj->id, obj->ref.refcount.counter); + + return container_of(obj, struct siw_mem, hdr); + } + dprint(DBG_MM|DBG_OBJ|DBG_ON, "(MEM%d): not found!\n", id); + + return NULL; +} + +int siw_qp_add(struct siw_dev *dev, struct siw_qp *qp) +{ + int rv = siw_add_obj(&dev->idr_lock, &dev->qp_idr, &qp->hdr); + if (!rv) { + dprint(DBG_OBJ, "(QP%d): New Object\n", QP_ID(qp)); + qp->hdr.dev = dev; + } + return rv; +} + +int siw_cq_add(struct siw_dev *dev, struct siw_cq *cq) +{ + int rv = siw_add_obj(&dev->idr_lock, &dev->cq_idr, &cq->hdr); + if (!rv) { + dprint(DBG_OBJ, "(CQ%d): New Object\n", cq->hdr.id); + cq->hdr.dev = dev; + } + return rv; +} + +int siw_pd_add(struct siw_dev *dev, struct siw_pd *pd) +{ + int rv = siw_add_obj(&dev->idr_lock, &dev->pd_idr, &pd->hdr); + if (!rv) { + dprint(DBG_OBJ, "(PD%d): New Object\n", pd->hdr.id); + pd->hdr.dev = dev; + } + return rv; +} + +/* + * Stag lookup is based on its index part only (24 bits) + * It is assumed that the idr_get_new_above(,,1,) function will + * always return a new id within this range (0x1...0xffffff), + * if one is available. + * The code avoids special Stag of zero and tries to randomize + * STag values. + */ +int siw_mem_add(struct siw_dev *dev, struct siw_mem *m) +{ + u32 id, pre_id; + unsigned long flags; + int rv; + + do { + get_random_bytes(&pre_id, sizeof pre_id); + pre_id &= 0xffff; + } while (pre_id == 0); +again: + do { + if (!(idr_pre_get(&dev->mem_idr, GFP_KERNEL))) + return -ENOMEM; + + spin_lock_irqsave(&dev->idr_lock, flags); + rv = idr_get_new_above(&dev->mem_idr, m, pre_id, &id); + spin_unlock_irqrestore(&dev->idr_lock, flags); + + } while (rv == -EAGAIN); + + if (rv == -ENOSPC || (rv == 0 && id > SIW_STAG_MAX)) { + if (rv == 0) { + spin_lock_irqsave(&dev->idr_lock, flags); + idr_remove(&dev->mem_idr, id); + spin_unlock_irqrestore(&dev->idr_lock, flags); + } + if (pre_id == 1) { + dprint(DBG_OBJ|DBG_MM|DBG_ON, + "(IDR): New Object failed: %d\n", pre_id); + return -ENOSPC; + } + pre_id = 1; + goto again; + } else if (rv) { + dprint(DBG_OBJ|DBG_MM|DBG_ON, + "(IDR%d): New Object failed: rv %d\n", id, rv); + return rv; + } + siw_objhdr_init(&m->hdr); + m->hdr.id = id; + m->hdr.dev = dev; + dprint(DBG_OBJ|DBG_MM, "(IDR%d): New Object\n", id); + + return 0; +} + +void siw_remove_obj(spinlock_t *lock, struct idr *idr, + struct siw_objhdr *hdr) +{ + unsigned long flags; + + dprint(DBG_OBJ, "(OBJ%d): IDR Remove Object\n", hdr->id); + + spin_lock_irqsave(lock, flags); + idr_remove(idr, hdr->id); + spin_unlock_irqrestore(lock, flags); +} + + +/********** routines to put objs back and free if no ref left *****/ + +static void siw_free_cq(struct kref *ref) +{ + struct siw_cq *cq = + (container_of(container_of(ref, struct siw_objhdr, ref), + struct siw_cq, hdr)); + + dprint(DBG_OBJ, "(CQ%d): Free Object\n", cq->hdr.id); + + kfree(cq); +} + +static void siw_free_qp(struct kref *ref) +{ + struct siw_qp *qp = + container_of(container_of(ref, struct siw_objhdr, ref), + struct siw_qp, hdr); + + dprint(DBG_OBJ|DBG_CM, "(QP%d): Free Object\n", QP_ID(qp)); + + if (qp->cep) + siw_cep_put(qp->cep); + + kfree(qp); +} + +static void siw_free_pd(struct kref *ref) +{ + struct siw_pd *pd = + container_of(container_of(ref, struct siw_objhdr, ref), + struct siw_pd, hdr); + + dprint(DBG_OBJ, "(PD%d): Free Object\n", pd->hdr.id); + + kfree(pd); +} + +static void siw_free_mem(struct kref *ref) +{ + struct siw_mem *m; + + m = container_of(container_of(ref, struct siw_objhdr, ref), + struct siw_mem, hdr); + + dprint(DBG_MM|DBG_OBJ, "(MEM%d): Free Object\n", OBJ_ID(m)); + + if (SIW_MEM_IS_MW(m)) { + struct siw_mw *mw = container_of(m, struct siw_mw, mem); + kfree(mw); + } else { + struct siw_mr *mr = container_of(m, struct siw_mr, mem); + dprint(DBG_MM|DBG_OBJ, "(MEM%d): Release UMem\n", OBJ_ID(m)); + ib_umem_release(mr->umem); + kfree(mr); + } +} + + +void siw_cq_put(struct siw_cq *cq) +{ + dprint(DBG_OBJ, "(CQ%d): Old refcount: %d\n", + OBJ_ID(cq), atomic_read(&cq->hdr.ref.refcount)); + kref_put(&cq->hdr.ref, siw_free_cq); +} + +void siw_qp_put(struct siw_qp *qp) +{ + dprint(DBG_OBJ, "(QP%d): Old refcount: %d\n", + QP_ID(qp), atomic_read(&qp->hdr.ref.refcount)); + kref_put(&qp->hdr.ref, siw_free_qp); +} + +void siw_pd_put(struct siw_pd *pd) +{ + dprint(DBG_OBJ, "(PD%d): Old refcount: %d\n", + OBJ_ID(pd), atomic_read(&pd->hdr.ref.refcount)); + kref_put(&pd->hdr.ref, siw_free_pd); +} + +void siw_mem_put(struct siw_mem *m) +{ + dprint(DBG_MM|DBG_OBJ, "(MEM%d): Old refcount: %d\n", + OBJ_ID(m), atomic_read(&m->hdr.ref.refcount)); + kref_put(&m->hdr.ref, siw_free_mem); +} + + +/***** routines for WQE handling ***/ + +/* + * siw_wqe_get() + * + * Get new WQE. For READ RESPONSE, take it from the free list which + * has a maximum size of maximum inbound READs. All other WQE are + * malloc'ed which creates some overhead. Consider change to + * + * 1. malloc WR only if it cannot be synchonously completed, or + * 2. operate own cache of reuseable WQE's. + * + * Current code trusts on malloc efficiency. + */ +inline struct siw_wqe *siw_wqe_get(struct siw_qp *qp, enum siw_wr_opcode op) +{ + struct siw_wqe *wqe; + + if (op == SIW_WR_RDMA_READ_RESP) { + spin_lock(&qp->freelist_lock); + if (!(list_empty(&qp->wqe_freelist))) { + wqe = list_entry(qp->wqe_freelist.next, + struct siw_wqe, list); + list_del(&wqe->list); + spin_unlock(&qp->freelist_lock); + wqe->processed = 0; + dprint(DBG_OBJ|DBG_WR, + "(QP%d): WQE from FreeList p: %p\n", + QP_ID(qp), wqe); + } else { + spin_unlock(&qp->freelist_lock); + wqe = NULL; + dprint(DBG_ON|DBG_OBJ|DBG_WR, + "(QP%d): FreeList empty!\n", QP_ID(qp)); + } + } else { + wqe = kzalloc(sizeof(struct siw_wqe), GFP_KERNEL); + dprint(DBG_OBJ|DBG_WR, "(QP%d): New WQE p: %p\n", + QP_ID(qp), wqe); + } + if (wqe) { + INIT_LIST_HEAD(&wqe->list); + siw_qp_get(qp); + wqe->qp = qp; + } + return wqe; +} + +inline struct siw_wqe *siw_srq_wqe_get(struct siw_srq *srq) +{ + struct siw_wqe *wqe = kzalloc(sizeof(struct siw_wqe), GFP_KERNEL); + + dprint(DBG_OBJ|DBG_WR, "(SRQ%p): New WQE p: %p\n", srq, wqe); + if (wqe) { + /* implicite: wqe->qp = NULL; */ + INIT_LIST_HEAD(&wqe->list); + wqe->qp = NULL; + } + return wqe; +} + +/* + * siw_srq_fetch_wqe() + * + * fetch one RQ wqe from the SRQ and inform user + * if SRQ lower watermark reached + */ +inline struct siw_wqe *siw_srq_fetch_wqe(struct siw_qp *qp) +{ + struct siw_wqe *wqe; + struct siw_srq *srq = qp->srq; + int qlen; + + lock_srq(srq); + if (!list_empty(&srq->rq)) { + wqe = list_first_wqe(&srq->rq); + list_del_init(&wqe->list); + qlen = srq->max_wr - atomic_inc_return(&srq->space); + unlock_srq(srq); + wqe->qp = qp; + if (srq->armed && qlen < srq->limit) { + srq->armed = 0; + siw_async_srq_ev(srq, IB_EVENT_SRQ_LIMIT_REACHED); + } + return wqe; + } + unlock_srq(srq); + return NULL; +} + +inline void siw_free_inline_sgl(struct siw_sge *sge, int num_sge) +{ + while (num_sge--) { + kfree(sge->mem.buf); /* kfree handles NULL pointers */ + sge++; + } +} + +inline void siw_unref_mem_sgl(struct siw_sge *sge, int num_sge) +{ + while (num_sge--) { + if (sge->mem.obj != NULL) + siw_mem_put(sge->mem.obj); + sge++; + } +} + + +void siw_wqe_put(struct siw_wqe *wqe) +{ + struct siw_qp *qp = wqe->qp; + unsigned long flags; + + dprint(DBG_OBJ|DBG_WR, " WQE: %llu:, type: %d, p: %p\n", + (unsigned long long)wr_id(wqe), wr_type(wqe), wqe); + + switch (wr_type(wqe)) { + + case SIW_WR_SEND: + case SIW_WR_RDMA_WRITE: + if (likely(!SIW_INLINED_DATA(wqe))) + siw_unref_mem_sgl(wqe->wr.sgl.sge, + wqe->wr.sgl.num_sge); + else + siw_free_inline_sgl(wqe->wr.sgl.sge, + wqe->wr.sgl.num_sge); + case SIW_WR_RDMA_WRITE_WITH_IMM: + case SIW_WR_SEND_WITH_IMM: + kfree(wqe); + break; + + case SIW_WR_RECEIVE: + case SIW_WR_RDMA_READ_REQ: + siw_unref_mem_sgl(wqe->wr.sgl.sge, wqe->wr.sgl.num_sge); + kfree(wqe); + break; + + case SIW_WR_RDMA_READ_RESP: + siw_unref_mem_sgl(wqe->wr.sgl.sge, 1); + wqe->wr.sgl.sge[0].mem.obj = NULL; + /* + * freelist can be accessed by tx processing (rresp done) + * and rx softirq (get new wqe for rresponse scheduling) + */ + INIT_LIST_HEAD(&wqe->list); + spin_lock_irqsave(&wqe->qp->freelist_lock, flags); + list_add_tail(&wqe->list, &wqe->qp->wqe_freelist); + spin_unlock_irqrestore(&wqe->qp->freelist_lock, flags); + break; + + default: + WARN_ON(1); + } + siw_qp_put(qp); +} diff --git a/drivers/infiniband/hw/siw/siw_obj.h b/drivers/infiniband/hw/siw/siw_obj.h new file mode 100644 index 0000000..7b8af6c --- /dev/null +++ b/drivers/infiniband/hw/siw/siw_obj.h @@ -0,0 +1,109 @@ +/* + * Software iWARP device driver for Linux + * + * Authors: Bernard Metzler <bmt@zurich.ibm.com> + * + * Copyright (c) 2008-2010, IBM Corporation + * + * 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 + * 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. + * + * - Neither the name of IBM nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * 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. + */ + +#ifndef _SIW_OBJ_H +#define _SIW_OBJ_H + +#include <linux/idr.h> +#include <linux/rwsem.h> +#include <linux/version.h> +#include <linux/sched.h> +#include <linux/semaphore.h> + +#include <rdma/ib_verbs.h> + +#include "siw_debug.h" + + +static inline struct siw_dev *siw_dev_ofa2siw(struct ib_device *ofa_dev) +{ + return container_of(ofa_dev, struct siw_dev, ofa_dev); +} + +static inline void siw_cq_get(struct siw_cq *cq) +{ + kref_get(&cq->hdr.ref); + dprint(DBG_OBJ, "(CQ%d): New refcount: %d\n", + OBJ_ID(cq), atomic_read(&cq->hdr.ref.refcount)); +} +static inline void siw_qp_get(struct siw_qp *qp) +{ + kref_get(&qp->hdr.ref); + dprint(DBG_OBJ, "(QP%d): New refcount: %d\n", + OBJ_ID(qp), atomic_read(&qp->hdr.ref.refcount)); +} +static inline void siw_pd_get(struct siw_pd *pd) +{ + kref_get(&pd->hdr.ref); + dprint(DBG_OBJ, "(PD%d): New refcount: %d\n", + OBJ_ID(pd), atomic_read(&pd->hdr.ref.refcount)); +} +static inline void siw_mem_get(struct siw_mem *mem) +{ + kref_get(&mem->hdr.ref); + dprint(DBG_OBJ|DBG_MM, "(MEM%d): New refcount: %d\n", + OBJ_ID(mem), atomic_read(&mem->hdr.ref.refcount)); +} + +extern void siw_remove_obj(spinlock_t *lock, struct idr *idr, + struct siw_objhdr *hdr); + +extern void siw_objhdr_init(struct siw_objhdr *); +extern void siw_idr_init(struct siw_dev *); +extern void siw_idr_release(struct siw_dev *); + +extern struct siw_cq *siw_cq_id2obj(struct siw_dev *, int); +extern struct siw_qp *siw_qp_id2obj(struct siw_dev *, int); +extern struct siw_mem *siw_mem_id2obj(struct siw_dev *, int); + +extern int siw_qp_add(struct siw_dev *, struct siw_qp *); +extern int siw_cq_add(struct siw_dev *, struct siw_cq *); +extern int siw_pd_add(struct siw_dev *, struct siw_pd *); +extern int siw_mem_add(struct siw_dev *, struct siw_mem *m); + +extern struct siw_wqe *siw_wqe_get(struct siw_qp *, enum siw_wr_opcode); +extern struct siw_wqe *siw_srq_wqe_get(struct siw_srq *); +extern struct siw_wqe *siw_srq_fetch_wqe(struct siw_qp *); + +extern void siw_cq_put(struct siw_cq *); +extern void siw_qp_put(struct siw_qp *); +extern void siw_pd_put(struct siw_pd *); +extern void siw_mem_put(struct siw_mem *); +extern void siw_wqe_put(struct siw_wqe *); + +#endif

SIW: Object management

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